@phdthesis{Raju2021, author = {Raju, Rajarshi Roy}, title = {'Smart' Janus emulsions}, school = {Universit{\"a}t Potsdam}, year = {2021}, abstract = {Emulsions constitute one of the most prominent and continuously evolving research areas in Colloid Chemistry, which involves the preparation of mixtures or dispersions of immiscible components in a continuous medium. Besides conventional oil-in-water or water-in-oil emulsions, other emulsions of complex droplet morphologies have recently attracted significant research interests. Especially Janus emulsions, in which each droplet is comprised of two distinct sub-regions, have shown versatile potential applications. One of their advantages is the possibility of compartmentalization, which enables to play with two different chemistries in a single droplet. Though microfluidic methods are conventionally used to prepare Janus emulsions, their industrial applications are largely hindered by low throughput and extensive instrumentations. Recently, it has been discovered that simply one-pot moderate/high energy emulsification is also capable of developing Janus morphology, although their preparation and stabilization remain rather substantially challenging. This cumulative doctoral thesis focuses on the preparation and characterization of 'smart' Janus emulsions, i.e. Janus emulsions with special stimuli-responsive features. One-step moderate/high energy emulsification of olive and silicone oil in an aqueous medium was carried out. Special consideration was devoted to the interfacial tensions among the components to maintain the criteria of forming characteristic droplet architectures, in addition to avoiding multiple emulsion destabilization phenomena like imminent phase separation or even separated droplet formation. A series of investigations were conducted related to the formation of complexes of charged macromolecules and role of them as stabilizers to achieve stable Janus emulsions for a realistic timeframe (more than 3 months). The correlation between the size of the stabilizer particles and the droplet size of emulsion was established. Furthermore, it was observed that Janus emulsion gels with interesting rheological properties can be fabricated in the presence of suitable polyelectrolyte complexes. Janus emulsions that could be influenced by pH, temperature or magnetic field were successfully produced in presence of characteristic stimuli-responsive stabilizers. Afterwards, the effect of these changes was studied by different characterization techniques. The size and morphology could be tuned easily by changing the pH. The incorporation of iron oxide magnetic nanoparticles (synthesized separately by a co-precipitation method) to one component of the Janus emulsion was carried out so that the movement and orientation of the complex droplets in aqueous media could be controlled by an external magnetic field. Additionally, temperature-triggered instantaneous reversible breakdown of Janus droplets was also accomplished. The responses of the Janus droplets by the stimuli were well-documented and explained. Another goal of the present contribution was to exploit this special morphological feature of emulsions as a template for producing porous materials. This was demonstrated by the preparation of ultralight magnetic responsive aerogels, utilizing Janus emulsion gels. The produced aerogels also showed the capacity to separate toxic dye from water. To the best of our knowledge, this is the first example of investigation towards batch scale production of Janus emulsion with such special stimuli-responsive properties by a simple bulk emulsification method.}, language = {en} } @phdthesis{Heinzel2021, author = {Heinzel, Mirko Noa}, title = {World Bank staff and project implementation}, year = {2021}, language = {en} } @phdthesis{Seeger2021, author = {Seeger, Anke}, title = {Wirtschaftliche Integration in Preußen nach 1815}, series = {Schriftenreihe der David-Mevius-Gesellschaft ; 14}, journal = {Schriftenreihe der David-Mevius-Gesellschaft ; 14}, publisher = {Kovac}, address = {Hamburg}, isbn = {978-3-339-12310-7}, school = {Universit{\"a}t Potsdam}, pages = {552}, year = {2021}, abstract = {Der Charakter Preußens als composite monarchy pr{\"a}gte seine Geschichte, wobei die politischen und territorialen Verwerfungen zu Beginn des 19. Jahrhunderts besondere Herausforderungen zur Integration der 1815 hinzugewonnenen Landesteile mit sich brachten - schließlich liefen sie parallel zu den gesellschaftlichen und {\"o}konomischen Wandlungsprozessen jener ,Sattelzeit'. Die Potsdamer Dissertation widmet sich erstmals mit vergleichendem Blick der wirtschaftlichen Integration zweier Gebiete, denen unter den preußischen Neuerwerbungen von 1815 seitens der bisherigen Forschung weniger Aufmerksamkeit geschenkt wurde: das zuvor schwedische Vorpommern sowie diejenigen von Sachsen abgetretenen Territorien, die der dann entstehenden Provinz Brandenburg zugeordnet wurden, einschließlich der Niederlausitz. Quellenbasiert und methodisch fundiert arbeitet die Studie heraus, inwiefern es gelang, diese neuen Landesteile wirtschaftlich in den preußischen Gesamtstaat zu integrieren und so einen einheitlichen Wirtschaftsraum zu konstituieren. In welchem Maße staatliche und nicht-staatliche Akteure aus den Provinzen an dem Integrationsprozess beteiligt waren, ist dabei von besonderem Interesse. Lagen Hemmnisse etwa eher in Strukturen oder eher in dem Verhalten maßgeblicher Personen und Institutionen begr{\"u}ndet? Warum stellte sich ein administratives oder legislatives Vorgehen in einem Gebiet als erfolgreich heraus, w{\"a}hrend es andernorts mehr Widerst{\"a}nde hervorrief? Welche Bedeutung kam außerdem der allgemeinen wirtschaftlichen Verfassung und deren Entwicklung w{\"a}hrend der beginnenden Industrialisierung f{\"u}r die Integrationsf{\"a}higkeit eines Gebietes zu? Durch den Vergleich der Territorien lassen sich die Motive der Beteiligten sowie Bedingungen und Einflussfaktoren f{\"u}r die wirtschaftliche Integration identifizieren.}, language = {de} } @phdthesis{Weinke2021, author = {Weinke, Daniel}, title = {Wirtschaftliche B{\"u}rgerbeteiligung}, publisher = {Tectum Verlag}, address = {Baden-Baden}, isbn = {978-3-8288-4685-2}, doi = {10.5771/9783828877689}, pages = {XVIII, 283}, year = {2021}, abstract = {Das Spannungsfeld zwischen dem Ausbau erneuerbarer Energien einerseits und Akzeptanzproblemen andererseits adressiert der Landesgesetzgeber Mecklenburg-Vorpommerns mit einem Beteiligungsgesetz zur verpflichtenden wirtschaftlichen Teilhabem{\"o}glichkeit. Dabei stellt sich die Frage nach der Vereinbarkeit mit geltendem Recht, insbesondere ob der Landesgesetzgeber gesetzgebungsbefugt ist. Dar{\"u}ber hinaus zeigt der Autor den Rahmen f{\"u}r eine Regelung auf und positioniert sich zu m{\"o}glichen Grundrechtseingriffen durch eine solche Regelung. Die Aktualit{\"a}t der Untersuchung zeigt die gegen das Gesetz anh{\"a}ngige Verfassungsbeschwerde ebenso wie die dynamische Gesetzgebung - so statuiert \S 36g Abs. 5 EEG nunmehr eine L{\"a}nder{\"o}ffnungsklausel.}, language = {de} } @phdthesis{Jung2021, author = {Jung, Jonathan}, title = {Werbeblocker im Internet}, series = {Schriften zum geistigen Eigentum und zum Wettbewerbsrecht ; 126}, journal = {Schriften zum geistigen Eigentum und zum Wettbewerbsrecht ; 126}, publisher = {Nomos}, address = {Baden-Baden}, isbn = {978-3-8487-8224-6}, school = {Universit{\"a}t Potsdam}, pages = {473}, year = {2021}, abstract = {Werbeblocker ber{\"u}hren zahlreiche, bislang ungekl{\"a}rte Rechtsfragen. W{\"a}hrend Werbeblocker bisher vor allem anhand des Lauterkeitsrechts beurteilt worden sind, zeigt diese Arbeit, dass vielmehr urheberrechtliche Wertungen entscheidend sind. Diese werden mit Blick auf die aktuelle Rechtsprechung des EuGH ausf{\"u}hrlich hergeleitet. Weiterhin wird der Begriff des Mitbewerbers im Lauterkeitsrecht fortentwickelt und mit der Bezugnahme auf die gesch{\"a}ftlichen Entscheidung auf ein neues Fundament gestellt. Die Arbeit analysiert zudem umfassend die Rechtm{\"a}ßigkeit der Handlungsalternativen der Webseitenbetreiber und der Reaktionsm{\"o}glichkeiten der Werbeblocker aus lauterkeitsrechtlicher und urheberrechtlicher Sicht unter Ber{\"u}cksichtigung der DS GVO.}, language = {de} } @phdthesis{Pingel2021, author = {Pingel, Ruta}, title = {Well-being effects of proactivity through the lens of self-determination theory}, school = {Universit{\"a}t Potsdam}, pages = {106}, year = {2021}, abstract = {In modern times of evolving globalization and continuous technological developments, organizations are required to respond to ever-changing demands. Therefore, to be successful in today's highly uncertain environments, organizations need employees to actively search for opportunities, anticipate challenges, and act ahead. In other words, employee proactivity in the workplace represents a highly valuable resource in nowadays organizations. Empirical studies conducted as part of this thesis advance the research on the outcomes of proactivity from the individual perspective. The main contribution of this thesis pertains to revealing several important individual and contextual conditions under which engaging in proactivity will have negative and positive effects on employees' well-being and their consequent behaviours, as well as shedding light on the unique psychological mechanisms through which these effects unfold. From a practical standpoint, this research underscores the importance of creating work environments that support employees' autonomous motivation for proactivity and urge organizations and managers to be mindful about the pressures they place on employees to be proactive at work. Besides, this thesis stimulates research efforts aimed at further extending our knowledge of when and how individual proactive behaviours at work will do more good than harm for those who enact them.}, language = {en} } @phdthesis{Niroomand2021, author = {Niroomand, Kian}, title = {Wandlungsf{\"a}hige Verwaltungen}, publisher = {gito}, address = {Berlin}, isbn = {978-3-95545-400-5}, school = {Universit{\"a}t Potsdam}, pages = {660}, year = {2021}, language = {de} } @phdthesis{Zeppenfeld2021, author = {Zeppenfeld, Stefan}, title = {Vom Gast zum Gastwirt?}, series = {Geschichte der Gegenwart}, journal = {Geschichte der Gegenwart}, number = {26}, publisher = {Wallstein-Verlag}, address = {G{\"o}ttingen}, isbn = {978-3-8353-5022-9}, pages = {429}, year = {2021}, abstract = {Die Arbeitsmigration z{\"a}hlt zu den pr{\"a}genden gesellschaftlichen Wandlungsprozessen der deutschen Nachkriegsgeschichte. 14 Millionen »Gastarbeiter« kamen zwischen 1955 und 1973 in die Bundesrepublik, etwa 3 Millionen von ihnen kehrten nicht in ihre Heimatl{\"a}nder zur{\"u}ck. Vor allem T{\"u}rkeist{\"a}mmige blieben nach dem Anwerbestopp h{\"a}ufiger in Deutschland als die Arbeitskr{\"a}fte aus anderen L{\"a}ndern. Wie keine andere Stadt steht Berlin bis heute f{\"u}r die Einwanderung aus der T{\"u}rkei. Stefan Zeppenfeld untersucht den Wandel der t{\"u}rkischen Arbeitswelten von ihren Anf{\"a}ngen in den 1960er Jahren bis zur Wiedervereinigung. Ausgehend von der »Gastarbeit« im industriellen Großbetrieb sp{\"u}rt er in seiner Studie am Beispiel West-Berlins dem {\"U}bergang in andere Branchen nach. Er zeigt, wie der {\"o}ffentliche Dienst auch f{\"u}r Migrantinnen und Migranten attraktive Aufstiegsm{\"o}glichkeiten er{\"o}ffnete, zeichnet den schwierigen Weg in die gewerbliche Selbstst{\"a}ndigkeit nach und legt illegale Besch{\"a}ftigungsformen als alternative Verdienstm{\"o}glichkeit offen. Damit bettet der Autor die Geschichte der t{\"u}rkischen Arbeitsmigration in die deutsche Zeitgeschichte ein.}, language = {de} } @phdthesis{Abromeit2021, author = {Abromeit, Wolfgang}, title = {Vertragsgestaltung bei komplexen Vertr{\"a}gen des Staates mit Privaten}, series = {Schriften zum {\"o}ffentlichen Recht}, journal = {Schriften zum {\"o}ffentlichen Recht}, number = {1444}, publisher = {Duncker \& Humblot}, address = {Berlin}, isbn = {978-3-428-15802-7}, issn = {0582-0200}, pages = {307}, year = {2021}, abstract = {Vertragsgestaltung ist ein praktisch sehr relevantes Thema, das wegen der Justizorientierung in der Wissenschaft noch weitgehend stiefm{\"u}tterlich behandelt wird. In dieser Untersuchung wird, zumindest f{\"u}r die besonders delikate Konstellation bei komplexen Kooperationen des Staats mit Privaten ({\"O}PP/PPP), Abhilfe geschaffen. Dabei gr{\"u}ndet die Analyse auf einer fundierten Typisierung und Charakterisierung der Probleme solcher Projekte. Den theoretischen Rahmen liefert eine effizienzorientierte Studie institutionen{\"o}konomischer Ans{\"a}tze, namentlich der Transaktionskostentheorie und der Prinzipal-Agenten-Theorie, r{\"u}ckversichert {\"u}ber die praxisorientierten Grundregeln der vertraglichen Risikoverteilung. So gelingt es praktische Formulierungsvorschl{\"a}ge f{\"u}r Standardprobleme der Vertragsgestaltung, wie Leistungsbestimmungen, Anpassungsmechanismen, Konfliktbeilegungsregeln, Informationsmechanismen und K{\"u}ndigungsregeln zu finden. Diese werden auch aus den Erfolgsbedingungen erl{\"a}utert.}, language = {de} } @phdthesis{Hoeppner2021, author = {Hoeppner, Till}, title = {Urteil und Anschauung}, series = {Quellen und Studien zur Philosophie}, journal = {Quellen und Studien zur Philosophie}, number = {143}, publisher = {De Gruyter}, address = {Berlin ; Boston}, isbn = {978-3-11-055627-8}, issn = {0344-8142}, doi = {10.1515/9783110557374}, pages = {XIII, 410}, year = {2021}, abstract = {Wie hier durch textnahe und argumentative Rekonstruktion erstmals gezeigt wird, entwickelt Kant in der Metaphysischen Deduktion in drei Schritten: (i) einen Begriff des Urteils, auf dem die Tafel logischer Funktionen beruht; (ii) einen Begriff der Synthesis der Anschauung, der die Inhalte der Kategorien erkl{\"a}rt; und (iii) einen Begriff des Verstandes, demzufolge die Kategorien a priori zu demselben Verm{\"o}gen geh{\"o}ren, durch das wir auch urteilen. Die vorliegende Untersuchung ist eine argumentative Rekonstruktion von Kants Text. Der rekonstruierte Text ist der „Leitfaden der Entdeckung aller reinen Verstandesbegriffe" auf A 64 bis 83 / B 89 bis 113 der Kritik der reinen Vernunft in ihren beiden Auflagen von 1781 (A) und 1787 (B). Zudem werden andere, f{\"u}r ein Verst{\"a}ndnis der {\"U}berlegungen in diesem Kapitel erforderliche oder zumindest erhellende Textstellen aus der Kritik herangezogen; aus Schriften, die Kant nach der Kritik geschrieben hat; sowie schließlich aus Kants Nachlass-Notizen und aus Nachschriften zu seinen Vorlesungen jeweils seit der Entstehungszeit der Kritik. Von entscheidender Bedeutung sind dabei vor allem vier weitere Passagen der Kritik selbst: i) die r{\"u}ckblickende Beschreibung der Aufgabe der Metaphysischen Deduktion auf B 159, ii) die r{\"u}ckblickende Beschreibung des Vorgehens im „Leitfaden" auf A 299/B 355 f., iii) der Abschnitt „Von den Gr{\"u}nden a priori zur M{\"o}glichkeit der Erfahrung" auf A 95 bis 110 der Transzendentalen Deduktion der Kategorien in der ersten Auflage und schließlich iv) die \S\S 15 bis 21 auf B 128 bis 148 der Transzendentalen Deduktion der Kategorien in der zweiten Auflage der Kritik. Vor dem Hintergrund einer umfassenden und detaillierten Analyse des „Leitfadens", bei Hinzuziehung verwandter Stellen aus dem umgrenzten Textbestand und nicht zuletzt bei Ber{\"u}cksichtigung des Verh{\"a}ltnisses des „Leitfadens" zu den genannten vier Passagen der Kritik legt sich eine Interpretation der Metaphysischen Deduktion nahe, die sich nur schwer bestreiten l{\"a}sst, sobald diese Texte einmal gemeinsam betrachtet und auf eine bestimmte Weise zueinander ins Verh{\"a}ltnis gesetzt werden. Dabei kann eine durchgehend wohlwollende, argumentative Rekonstruktion dazu beitragen, auch die philosophische {\"U}berzeugungskraft der Position Kants deutlich zu machen.}, subject = {Kant, Immanuel [1724-1804]}, language = {de} } @phdthesis{Malmedie2021, author = {Malmedie, Lydia}, title = {Translating and organzing a wicked problem}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {en} } @phdthesis{Muellerschoen2021, author = {M{\"u}llersch{\"o}n, Andr{\´e}}, title = {Transfusionswesen in den deutschen Streitkr{\"a}ften vom Ersten Weltkrieg bis heute}, series = {Schriften zur Geschichte der Milit{\"a}rmedizin und des Sanit{\"a}tsdienstes}, journal = {Schriften zur Geschichte der Milit{\"a}rmedizin und des Sanit{\"a}tsdienstes}, number = {2}, publisher = {Beta Verlag und Marketinggesellschaft mbH}, address = {Bonn}, isbn = {978-3-927603-62-2}, issn = {2512-5001}, pages = {XV, 480}, year = {2021}, abstract = {In der vorliegenden Arbeit wird die Geschichte des milit{\"a}rischen Transfusionswesens in Deutschland, ausgehend vom Deutsch-Franz{\"o}sischen Krieg, {\"u}ber den Ersten und Zweiten Weltkrieg, bis hin zu der Organisation des Blutspendewesens sowie der Herstellung von Blut- und Blutbestandteilkonserven in der NVA, aber auch der Bundeswehr analysiert, Gemeinsamkeiten und Unterschiede der einzelnen Epochen und Armeen aufgezeigt sowie r{\"u}ckblickend ethische Problemfelder identifiziert und aufgearbeitet. Zus{\"a}tzlich werden die den jeweiligen Zeitr{\"a}umen zugeordneten technischen Apparaturen und Verfahren sowie zeitgen{\"o}ssische Forschungsprojekte skizziert.}, language = {de} } @phdthesis{Wandt2021, author = {Wandt, Viktoria Klara Veronika}, title = {Trace elements, ageing, and sex}, school = {Universit{\"a}t Potsdam}, pages = {iii, 204}, year = {2021}, language = {en} } @phdthesis{Baeseler2021, author = {Baeseler, Jessica}, title = {Trace element effects on longevity and neurodegeneration with focus on C. elegans}, school = {Universit{\"a}t Potsdam}, pages = {X,114,VIII}, year = {2021}, abstract = {The trace elements zinc and manganese are essential for human health, especially due to their enzymatic and protein stabilizing functions. If these elements are ingested in amounts exceeding the requirements, regulatory processes for maintaining their physiological concentrations (homeostasis) can be disturbed. Those homeostatic dysregulations can cause severe health effects including the emergence of neurodegenerative disorders such as Parkinson's disease (PD). The concentrations of essential trace elements also change during the aging process. However, the relations of cause and consequence between increased manganese and zinc uptake and its influence on the aging process and the emergence of the aging-associated PD are still rarely understood. This doctoral thesis therefore aimed to investigate the influence of a nutritive zinc and/or manganese oversupply on the metal homeostasis during the aging process. For that, the model organism Caenorhabditis elegans (C. elegans) was applied. This nematode suits well as an aging and PD model due to properties such as its short life cycle and its completely sequenced, genetically amenable genome. Different protocols for the propagation of zinc- and/or manganese-supplemented young, middle-aged and aged C. elegans were established. Therefore, wildtypes, as well as genetically modified worm strains modeling inheritable forms of parkinsonism were applied. To identify homeostatic and neurological alterations, the nematodes were investigated with different methods including the analysis of total metal contents via inductively-coupled plasma tandem mass spectrometry, a specific probe-based method for quantifying labile zinc, survival assays, gene expression analysis as well as fluorescence microscopy for the identification and quantification of dopaminergic neurodegeneration.. During aging, the levels of iron, as well as zinc and manganese increased.. Furthermore, the simultaneous oversupply with zinc and manganese increased the total zinc and manganese contents to a higher extend than the single metal supplementation. In this relation the C. elegans metallothionein 1 (MTL-1) was identified as an important regulator of metal homeostasis. The total zinc content and the concentration of labile zinc were age-dependently, but differently regulated. This elucidates the importance of distinguishing these parameters as two independent biomarkers for the zinc status. Not the metal oversupply, but aging increased the levels of dopaminergic neurodegeneration. Additionally, nearly all these results yielded differences in the aging-dependent regulation of trace element homeostasis between wildtypes and PD models. This confirms that an increased zinc and manganese intake can influence the aging process as well as parkinsonism by altering homeostasis although the underlying mechanisms need to be clarified in further studies.}, language = {en} } @phdthesis{KnoxBrown2021, author = {Knox-Brown, Patrick Frank}, title = {Towards understanding the sequence-structure-function relationship of intrinsically disordered LEA_4 proteins from Arabidopsis thaliana}, school = {Universit{\"a}t Potsdam}, pages = {172, XI}, year = {2021}, abstract = {Water-deficits can cause lethal damage to organisms, which is rooted in cellular dehydration. Many plant species, but also other organisms have developed mechanisms to tolerate such stresses, such as the expression of LEA proteins. Many studies report on physiological protective functions of LEA proteins but lack information about their precise mechanisms on a molecular level. Most LEA proteins are intrinsically disordered in dilute solution but may adopt a distinct secondary structure upon changes in solvent conditions. Understanding the molecular mechanism of how LEA proteins contribute to the counteraction of cellular damage during water-deficits may in the long-term pave the way for breeding crops that are resistant to the effects of global warming. The objective of the work at hand is to improve the biophysical understanding of the sequencestructure-function relationship of LEA proteins as membrane stabilizers, based on the LEA_4 family of the model plant A. thaliana. This is pursued by using a combination of spectroscopic and scattering techniques, supported by bioinformatics and computational analyses. Eight out of the 18 LEA_4 proteins are experimentally assessed revealing that a coil-helix transition in response to water-deficit is a common feature, as predicted for the entire family. In addition, they all stabilize simple membrane models during a freeze/ thaw cycle. Three-dimensional structure prediction of representative members suggests that their completely folded states are represented by a sequential arrangement of alpha-helical segments connected by unstructured linkers, which is experimentally verified for the LEA_4 protein COR15A. The unstructured linker region of COR15A represents a conserved motif among its closest homologs and is, therefore, of particular interest. Facilitating a set of seven designed and investigated COR15A mutants uncovers a complex interplay of transient interactions between the amphipathic alpha-helical segments, mediated by the linker, which fine-tunes folding transitions and structural ensembles upon reduced water-availability. Finally, alpha-helicity is also induced in COR15A upon temperature decrease, which is enhanced in the presence of osmolytes. In addition, high solution osmolarity induced secondary structure is followed by oligomerization of COR15A. Interestingly, the functionality of COR15A, in terms of liposome stabilization, strongly correlates with its alpha-helix ratio in the folded state. The present work significantly improves the understanding of the sequence-structure-function relationship for LEA_4 proteins and offers novel findings on folding mechanisms and oligomerization of COR15A.}, language = {en} } @phdthesis{Kaptur2021, author = {Kaptur, Joanna Alexandra}, title = {The LEUNIG regulatory complex}, school = {Universit{\"a}t Potsdam}, year = {2021}, abstract = {Patterning along the apical-basal (A-B) axis is a crucial step during the early stages of plant embryogenesis and leads to the establishment of two poles of which each will develop their own stem cell niches. The activity of these meristems is responsible for post-embryonic growth, with the shoot apical meristem (SAM) generating the above-ground organs and the root apical meristem (RAM) producing the subterranean structures of the plant. While several transcriptional regulators governing A-B patterning have been identified, precisely how their regulatory function is orchestrated remains elusive. This study focuses on transcriptional co-regulators LEUNIG (LUG) and closely related LEUNIG_HOMOLOG (LUH) and their role in the formation of A-B patterning during embryogenesis as well as their post-embryonic maintenance. A link between the LUG regulatory complex and SAM formation and maintenance comes from the observation that lug mutants heterozygous for the luh allele (lug luh+/-) often have enlarged SAMs resulting from misregulated cell divisions. A more severe phenotype is observed in lug luh double mutants which are embryonically lethal. In this study, a detailed characterisation of lug luh embryo phenotype reveals that these mutants display aberrant cell divisions along the A-B axis, which correlates with defects in auxin distribution, complete loss of apical identity, and altered expression of transcription factors determining basal fate. Like other co-regulators, LUG and LUH lack intrinsic DNA-binding domains and instead must interact with DNA-binding cofactors to ensure recruitment to regulatory elements of target genes. This either involves direct contact between the co-regulators and transcription factors (TFs) or the formation of higher-order complexes with adaptor proteins such as SEUSS (SEU) or related SEUSS-LIKEs (SLKs), which facilitate binding to specific TFs. Results presented in this study provide insight into the molecular framework for the LUG regulatory complex activity during embryogenesis. Both yeast and in planta assays showed that LUG/LUH and SEU/SLKs physically associate with a variety of WUSCHEL-RELATED HOMEOBOX (WOX) TFs including members of the WOX2-module. Furthermore, genetic interactions between members of the WOX2-module and the LUG regulatory complex, support their mutual action during embryogenesis. Based on the reduced activity of HOMEODOMAIN LEUCINE-ZIPPER CLASS III (HD-ZIPIII) promoters in lug luh embryos, a model is proposed in which the LUG regulatory complex functions together with WOX2-module to promote apical identity and subsequent SAM initiation through regulation of the HD-ZIPIIIs. The activity of the LUG complex in promoting basal embryo identity through positive regulation of microRNA165/166 suggests that this complex also has functions that are independent of the WOX2-module. Preliminary work reported in this study further uncovered the role of the LUG regulatory complex in post-embryonic development. While the fasciated inflorescence meristems of lug luh+/- plants displayed defects in auxin transport and altered activity of stem cell markers, embryonically rescued lug luh mutants formed flat and differentiated SAMs. In addition, rescued lug luh mutants exhibited severely disorganised RAM and defects in quiescent center (QC) specification, supporting the involvement of the LUG complex in post-embryonic RAM maintenance.}, language = {en} } @phdthesis{Rhaout2021, author = {Rhaout, Mohamed Kamal}, title = {The Impact of Motivational Factors on Employees' Turnover Intentions}, pages = {132}, year = {2021}, language = {de} } @phdthesis{Saussenthaler2021, author = {Saussenthaler, Sophie}, title = {The impact of DNA methylation on susceptibility to typ 2 diabetes in NZO mice}, school = {Universit{\"a}t Potsdam}, pages = {XIX, 150}, year = {2021}, abstract = {The development of type 2 diabetes (T2D) is driven by genetic as well as life style factors. However, even genetically identical female NZO mice on a high-fat diet show a broad variation in T2D onset. The main objective of this study was to elucidate and investigate early epigenetic determinants of type 2 diabetes. Prior to other experiments, early fat content of the liver (<55.2 HU) in combination with blood glucose concentrations (>8.8 mM) were evaluated as best predictors of diabetes in NZO females. Then, DNA methylome and transcriptome were profiled to identify molecular pathophysiological changes in the liver before diabetes onset. The major finding of this thesis is that alterations in the hepatic DNA methylome precede diabetes onset. Of particular interest were 702 differentially methylated regions (DMRs), of which 506 DMRs had genic localization. These inter-individual DMRs were enriched by fivefold in the KEGG pathway type 2 diabetes mellitus, independent of the level of gene expression, demonstrating an epigenetic predisposition toward diabetes. Interestingly, among the list of hepatic DMRs, eleven DMRs were associated with known imprinted genes in the mouse genome. Thereby, six DMRs (Nap1l5, Mest, Plagl1, Gnas, Grb10 and Slc38a4) localized to imprinting control regions, including five iDMRs that exhibited hypermethylation in livers of diabetes-prone mice. This suggests that gain of DNA methylation in multiple loci of the paternal alleles has unfavourable metabolic consequences for the offspring. Further, the comparative liver transcriptome analysis demonstrated differences in expression levels of 1492 genes related to metabolically relevant pathways, such as citrate cycle and fatty acid metabolism. The integration of hepatic transcriptome and DNA methylome indicated that 449 differentially expressed genes were potentially regulated by DNA methylation, including genes implicated in insulin signaling. In addition, liver transcriptomic profiling of diabetes-resistant and diabetes-prone mice revealed a potential transcriptional dysregulation of 17 hepatokines, in particular Hamp. The hepatic expression of Hamp was decreased by 52\% in diabetes-prone mice, on account of an increase in DNA methylation of promoter CpG-118. Hence, HAMP protein levels were lower in mice prone to develop diabetes, which correlated to higher liver triglyceride levels.. In sum, the identified DNA methylation changes appear to collectively favor the initiation and progression of diabetes in female NZO mice. In near future, epigenetic biomarkers are likely to contribute to improved diagnosis for T2D.}, language = {en} } @phdthesis{Liu2021, author = {Liu, Sisi}, title = {The history of plant diversity change and community assemply a high-altitude and high-latitude ecosystems inferred from sedimentary (ancient) DNA and pollen}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {en} } @phdthesis{Buss2021, author = {Buss, Martin}, title = {The dark side of visionary leadership}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {de} } @phdthesis{Czapka2021, author = {Czapka, Sophia}, title = {The bilingual advantage in executive functions and its influence on spelling}, school = {Universit{\"a}t Potsdam}, pages = {x, 108}, year = {2021}, language = {en} } @phdthesis{Zhao2021, author = {Zhao, Yuhang}, title = {Synthesis and surface functionalization on plasmonic nanoparticles for optical applications}, school = {Universit{\"a}t Potsdam}, pages = {VIII, 149}, year = {2021}, abstract = {This thesis focuses on the synthesis of novel functional materials based on plasmonic nanoparticles. Three systems with targeted surface modification and functionalization have been designed and synthesized, involving modified perylenediimide doped silica-coated silver nanowires, polydopamine or TiO2 coated gold-palladium nanorods and thiolated poly(ethylene glycol) (PEG-SH)/dodecanethiol (DDT) modified silver nanospheres. Their possible applications as plasmonic resonators, chiral sensors as well as photo-catalysts have been studied. In addition, the interaction between silver nanospheres and 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) molecules has also been investigated in detail. In the first part of the thesis, surface modification on Ag nanowires (NWs) with optimized silica coating through a modified St{\"o}ber method has been firstly conducted, employing sodium hydroxide (NaOH) to replace ammonia solution (NH4OH). The coated silver nanowires with a smooth silica shell have been investigated by single-particle dark-field scattering spectroscopy, transmission electron microscopy and electron-energy loss spectroscopy to characterize the morphologies and structural components. The silica-coated silver nanowires can be further functionalized with fluorescent molecules in the silica shell via a facile one-step coating method. The as-synthesized nanowire is further coupled with a gold nanosphere by spin-coating for the application of the sub-diffractional chiral sensor for the first time. The exciton-plasmon-photon interconversion in the system eases the signal detection in the perfectly matched 1D nanostructure and contributes to the high contrast of the subwavelength chiral sensing for the polarized light. In the second part of the thesis, dumbbell-shaped Au-Pd nanorods coated with a layer of polydopamine (PDA) or titanium dioxide (TiO2) have been constructed. The PDA- and TiO2- coated Au-Pd nanorods show a strong photothermal conversion performance under NIR illumination. Moreover, the catalytic performance of the particles has been investigated using the reduction of 4-nitrophenol (4-NP) as the model reaction. Under light irradiation, the PDA-coated Au-Pd nanorods exhibit a superior catalytic activity by increasing the reaction rate constant of 3 times. The Arrhenius-like behavior of the reaction with similar activation energies in the presence and absence of light irradiation indicates the photoheating effect to be the dominant mechanism of the reaction acceleration. Thus, we attribute the enhanced performance of the catalysis to the strong photothermal effect that is driven by the optical excitation of the gold surface plasmon as well as the synergy with the PDA layer. In the third part, the kinetic study on the adsorption of 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquino-dimethane (F4TCNQ) on the surface of Ag nanoparticles (Ag NPs) in chloroform has been reported in detail. Based on the results obtained from the UV-vis-NIR absorption spectroscopy, cryogenic transmission electron microscopy (cryo-TEM), scanning nano-beam electron diffraction (NBED) and electron energy loss spectroscopy (EELS), a two-step interaction kinetics has been proposed for the Ag NPs and F4TCNQ molecules. It includes the first step of electron transfer from Ag NPs to F4TCNQ indicated by the ionization of F4TCNQ, and the second step of the formation of Ag-F4TCNQ complex. The whole process has been followed via UV-vis-NIR absorption spectroscopy, which reveals distinct kinetics at two stages: the instantaneous ionization and the long-term complex formation. The kinetics and the influence of the molar ratio of Ag NPs/F4TCNQ molecules on the interaction between Ag NPs and F4TCNQ molecules in the organic solution are reported herein for the first time. Furthermore, the control experiment with silica-coated Ag NPs indicates that the charge transfer at the surface between Ag NPs and F4TCNQ molecules has been prohibited by a silica layer of 18 nm.}, language = {en} } @phdthesis{Nacak2021, author = {Nacak, Selma}, title = {Synthesis and Characterization of Upconversion Nanaparticles for Applications in Life Sciences}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {en} } @phdthesis{Hess2021, author = {Hess, Andreas}, title = {Synthese von funktionalisierbaren und abbaubaren Polymersystemen mit Disulfiden}, school = {Universit{\"a}t Potsdam}, pages = {v, 135}, year = {2021}, abstract = {Die vorliegende Arbeit besch{\"a}ftigt sich mit der Synthese von Disulfiden, der Thiol-Disulfid Metathesereaktion als M{\"o}glichkeit, Polymere zu funktionalisieren, und der Synthese von Polydisulfiden. Im ersten Teil der Arbeit wird die Aminolyse von RAFT-Polymeren und die Abh{\"a}ngigkeit der Polymer-Polymer Disulfidbildung von der Molmasse untersucht. Dabei wurde durch die Aufnahme von Reaktionskinetiken mittels Gel-Permeations-Chromatographie (GPC) festgestellt, dass je l{\"a}nger die Polymerketten sind, desto weniger Disulfid Polymerkopplung tritt auf. RAFT-Polymere werden oft genutzt, um die RAFT-Polymer Endgruppe nach der Polymerisation zu modifizieren oder in einer chemischen Reaktion zu funktionalisieren. Hier kann die Aminolyse in Anwesenheit von kurzkettigen Disulfiden, wie zum Beispiel Cystin, durchgef{\"u}hrt werden, um die Bildung von Polymer-Polymer Disulfiden vollst{\"a}ndig zu unterdr{\"u}cken und ein endgruppenfunktionalisiertes Polymer zu erhalten. Bei dieser Reaktion greift das bei der Aminolyse entstehende Polymerthiolat die kurzkettigen Disulfide an, und es kommt zur Bildung von funktionalisierten Polymeren. Es wurde ein Polyethylenglykoldisulfid eingesetzt, um ein amphiphiles Blockcopolymer zu erhalten. Als RAFT-Polymer wurde Polystyrol (PS) verwendet, und es konnte die Bildung von Polystyrol-Polyethylenglykol Copolymeren nachgewiesen werden. Das amphiphile Polymer bildet im w{\"a}ssrigen Medium Vesikel. Die Oberfl{\"a}che der Vesikel konnte mittels der Thiol-Disulfid Metathese umfunktionalisiert werden. Die Aminolyse von PS RAFT-Polymeren mit einem Polylaktiddisulfid oder einem Polybenzylglutamatdisulfid ergab Polystyrol-block-Polyester und Polystyrol-block-Polyaminos{\"a}uren Copolymere. Im zweiten Teil der Arbeit liegt der Fokus auf der Synthese von Polydisulfiden und ihren thermischen Eigenschaften. Es wurden verschiedene Alkyldithiole synthetisiert und mittels Wasserstoffperoxid und Triethylamin polymerisiert. Dabei konnte gezeigt werden, dass die Polymere teilkristallin sind und dass der Schmelzpunkt und die Kristallinit{\"a}t der Polymere mit steigender Alkylkettenl{\"a}nge zwischen den Disulfidbindungen zunehmen. Die M{\"o}glichkeit einer Polymerkettenerweiterung nach der Polymerisation ist mit diesem System gegeben. Die Abbaubarkeit der Polydisulfide konnte durch den Einsatz von Thiolen im basischen Milieu gezeigt werden.}, language = {de} } @phdthesis{Stoenescu2021, author = {Stoenescu, Richard}, title = {Syndikalismus in Deutschland und den USA, 1897-1937}, series = {Alternative | Demokratien. Studien zur Geschichte der Sozialdemokratie und des Sozialismus}, journal = {Alternative | Demokratien. Studien zur Geschichte der Sozialdemokratie und des Sozialismus}, number = {7}, publisher = {Metropol-Verlag}, isbn = {978-3-86331-611-2}, school = {Universit{\"a}t Potsdam}, pages = {580}, year = {2021}, language = {de} } @phdthesis{Dineva2021, author = {Dineva, Ekaterina Ivanova}, title = {Sun-as-a-star Spectroscopy with PEPSI}, school = {Universit{\"a}t Potsdam}, pages = {108}, year = {2021}, language = {en} } @phdthesis{RischkeNess2021, author = {Rischke-Neß, Janine}, title = {Subjektivierungen und Kriminalit{\"a}tsdiskurse im 18. Jahrhundert}, series = {Schriften des Fr{\"u}hneuzeitzentrums Potsdam}, journal = {Schriften des Fr{\"u}hneuzeitzentrums Potsdam}, number = {10}, publisher = {Vandenhoeck \& Ruprecht GmbH \& Co. KG}, address = {G{\"o}ttingen}, isbn = {978-3-8471-1164-1}, issn = {2198-5251}, pages = {473}, year = {2021}, language = {de} } @phdthesis{Stemmer2021, author = {Stemmer, Robert}, title = {Strategic business model innovation}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {en} } @phdthesis{Schrepp2021, author = {Schrepp, Caroline}, title = {Steuerliche Verlustnutzung im R{\"u}ckwirkungszeitraum : \S 2 Abs. 4 UmwStG}, series = {Steuerwissenschaftliche Schriften ; 75}, journal = {Steuerwissenschaftliche Schriften ; 75}, publisher = {Nomos}, address = {Baden-Baden}, isbn = {978-3-8487-8039-6}, school = {Universit{\"a}t Potsdam}, pages = {215}, year = {2021}, abstract = {Die Gestaltungsfreiheit des Steuerpflichtigen steht in einem Spannungsverh{\"a}ltnis zu einer effektiven Missbrauchsbek{\"a}mpfung durch den Gesetzgeber. Besonders ausgepr{\"a}gt ist dieses im Bereich der steuerlichen Verlustnutzung. Dabei ger{\"a}t die verfassungsrechtliche Verankerung der Verlustnutzung zunehmend aus dem Blick. Am Beispiel des \S 2 Abs. 4 UmwStG untersucht die Arbeit die verfassungsrechtlichen Grenzen von Verlustverrechnungsbeschr{\"a}nkungen. Es wird die enge Verkn{\"u}pfung zu \S 8c KStG herausgearbeitet und die Vorschrift vor dem Hintergrund der europ{\"a}ischen Missbrauchskonzeption beleuchtet. Die gewonnenen Ergebnisse m{\"u}nden in einen Vorschlag f{\"u}r eine Neufassung des \S 2 Abs. 4 UmwStG, der nationalen und europ{\"a}ischen Vorgaben Rechnung tr{\"a}gt.}, language = {de} } @phdthesis{Boehm2021, author = {B{\"o}hm, Isabell}, title = {Staatsklimahaftung}, series = {Schriften zum Umweltenergierecht ; 30}, journal = {Schriften zum Umweltenergierecht ; 30}, publisher = {Nomos}, address = {Bade-Baden}, isbn = {978-3-8487-7895-9}, school = {Universit{\"a}t Potsdam}, pages = {259}, year = {2021}, abstract = {Klimaklagen nehmen stetig an Relevanz zu. F{\"u}r rechtliche Untersuchungen gibt es dabei diverse Ankn{\"u}pfungspunkte. Die Arbeit befasst sich mit der Frage, inwieweit Staatshaftungsanspr{\"u}che wegen Klimasch{\"a}den gegen Deutschland bzw. die EU begr{\"u}ndbar sind, wenn eingegangene Verpflichtungen zur Reduzierung von Treibhausgasemissionen nicht eingehalten werden. Hierf{\"u}r werden der deutsche Amtshaftungsanspruch gem. \S 839 BGB i.V.m. Art. 34 GG, der unionsrechtliche Staatshaftungsanspruch gegen die Mitgliedstaaten und der Anspruch aus Art. 340 Abs. 2 AEUV gegen die EU n{\"a}her untersucht. Am Ende der Arbeit werden {\"U}berlegungen zu rechtspraktischen Perspektiven der Staatsklimahaftung angestellt, um die Erfolgs- und Realisierungsaussichten zu verbessern.}, language = {de} } @phdthesis{Topuz2021, author = {Topuz, Birol}, title = {Social integration and religion}, year = {2021}, language = {en} } @phdthesis{Yan2021, author = {Yan, Wan}, title = {Shape-Memory effects of thermoplatic multiblock copolymers with overlapping thermal transitions}, year = {2021}, language = {en} } @phdthesis{Okunew2021, author = {Okunew, Nikolai}, title = {Red Metal}, publisher = {Links}, address = {Berlin}, isbn = {978-3-96289-138-1}, school = {Universit{\"a}t Potsdam}, pages = {400}, year = {2021}, abstract = {Heavy-Metal-Fans waren in der zweiten H{\"a}lfte der 1980er-Jahre die vermutlich gr{\"o}ßte jugendliche Subkultur in der DDR. Sie gingen arbeiten, denn Schallplatten, ihr Outfit und Shopping-Fahrten nach Budapest waren teuer. F{\"u}r Politik interessierten sie sich jedoch kaum. Die SED war deshalb verunsichert, wie sie mit der Jugendkultur umgehen sollte, und bem{\"u}hte sich letztlich erfolglos, die Metal-Szene f{\"u}r ihre Ziele einzuspannen. Nikolai Okunew erz{\"a}hlt auf der Basis umfassender Archivrecherchen, dutzender Interviews und der breiten Szene-{\"U}berlieferung die Geschichte der Heavy-Metal-Szene in der DDR. Er zeigt, wie sich ihre Bands entwickelten und die Fans an den Wochenenden scharenweise in alle Ecken des Landes fuhren, um dort zu feiern, zu trinken und zu headbangen. Konflikte mit der Polizei und der Stasi werden dabei ebenso deutlich wie die Rolle des Radios, das den Heavy Metal ins Land trug.}, language = {de} } @phdthesis{Meese2021, author = {Meese, Franziska}, title = {Psychische Sch{\"a}digungen des Tatopfers als K{\"o}rperverletzung gem{\"a}ß \S\S 223, 229 StGB}, series = {Neue Juristische Beitr{\"a}ge; 138}, journal = {Neue Juristische Beitr{\"a}ge; 138}, publisher = {utzverlag GmbH}, address = {M{\"u}nchen}, isbn = {978-3-8316-4945-7}, school = {Universit{\"a}t Potsdam}, pages = {169}, year = {2021}, language = {de} } @phdthesis{Nieschalke2021, author = {Nieschalke, Kai}, title = {Proteinaddukte und Urinmetaboliten des Nagetierkanzerogens Methyleugenol als Biomarker der Exposition}, school = {Universit{\"a}t Potsdam}, pages = {142, XLIV}, year = {2021}, language = {de} } @phdthesis{Hebisch2021, author = {Hebisch, Benjamin}, title = {Power in supply chain negotiations: a two-stage approach}, series = {Schriftenreihe zum Verhandlungsmanagement ; Band 15}, journal = {Schriftenreihe zum Verhandlungsmanagement ; Band 15}, publisher = {Kovac}, address = {Hamburg}, isbn = {978-3-339-12400-5}, school = {Universit{\"a}t Potsdam}, pages = {XXX,106}, year = {2021}, abstract = {Negotiations between buyers and suppliers directly influence a company's costs, revenue, and consequently its profits. The outcome of these negotiations relies heavily on the companies' as well as the negotiators' power position. Across three empirical articles the author demonstrates how the own power position can first be identified as well as improved and subsequently used to maximize profits in negotiations between sellers and buyers. In the first paper the sources underlying buyer and supplier power are identified and weighted. The results of the first paper show the impact of each single sources on the buyer and supplier power. The number of suppliers available for one product is by far the most important source of power for both sides. The results indicate that a higher number of suppliers leads to a better power position of the buyer and simultaneously to an inferior power position of a single supplier. The second paper aims to examine the impact of the number of suppliers on the outcome of buyer-seller-negotiations thereby considering the innovation level of the products purchased. The results of the second study which are based on real negotiation data from a German car manufacturer indicate that the number of available suppliers has a stronger impact on the negotiation outcome for innovative than for functional, less innovative products. The third paper analyzes how the ability to take the counterpart's perspective (perspective taking ability) influences the negotiation outcome. This relationship is examined for different power positions. The results indicate that a negotiator's high perspective taking ability leads to a more unfavorable negotiation outcome compared to low perspective taking ability. Simultaneously, high perspective taking ability causes a more positive perception of the conducted negotiation than low perspective taking ability. This contradictory effect of perspective taking ability bears the risk for buyers and suppliers to assess an unfavorable outcome as positive. Finally, the results of the papers are summarized and discussed. The dissertation concludes with implications for practice, limitations of the work, and approaches for future research.}, language = {en} } @phdthesis{Liu2021, author = {Liu, Yue}, title = {Polymeric objects switchable between two shapes}, school = {Universit{\"a}t Potsdam}, pages = {xv, 73}, year = {2021}, abstract = {As the ongoing trend of developing smart materials that can reversibly switch geometry stimulated by environmental control addressed increasing attention in many research fields, especially for biomedical or soft robotic applications. Shape-memory polymers (SMPs), which can change shape, stiffness, size, and structure when exposed to an external stimulus, are intensively explored as encouraging material candidates for achieving multifunctionality, and for miniaturizing into micro-components to expand the applications. Besides, the geometrical design has gained growing attention for creating engineering applications, such as bi-stable mechanisms, and has the potential to be explored by implementing SMP for new functions. In this context, this thesis aimed to develop smart micro-/nano-objects based on SMP and explore new functions by geometrical design using SMP. Here, two types of stimuli-responsive objects capable of one-way temperature-memory effect (TME) or free-standing reversible actuation e.g., micro/nanofibers (i) and microcuboids (ii) at different aspects were explored. At first, it was hypothesized that the advanced atomic force microscopy (AFM) platform can be established to study individual polymeric micro-/nanofibers (i) in terms of incorporation and characterization of a reversible shape-memory actuation capability. Crystallizable material was chosen for preparing the fibers and the molecular alignment within the fibers among different diameters will influence the crystallization-induced elongation during cooling that determined the reversible effect. For the second type, microcuboids (ii), it was hypothesized that a programming and quantification approach can be developed to enable the realization and characterization of a one-way micro-TME and micro-shape-memory polymer actuation (SMPA) in microcuboids. The responsive temperature of one-way shape transformation can be tuned by programming temperature (Tp) and the separation temperature (Tsep) for post-programming can influence the actuation. Finally, a geometrical design with bi-stability was combined with SME to create new functions of shape actuation. It was hypothesized that the predicted bi-stable or mono-stable structures can be achieved with the aid of digital fabrication methods. Using shape-memory effect (SME), the alteration of bi-stable and mono-stable can initiate shape transformation with a larger magnitude and higher energy output. In the first part, the method to quantify the reversible SMPA of a single micro/nano crystallizable fiber with geometry change during the actuation was explored. Electrospinning was used to prepare poly (ε-caprolactone) (PCL) micro/nanofiber with different diameters, which were fixed by UV glue and crosslinked on the structured silicon wafer. Using AFM, the programming, as well as the observation of recovery and reversible displacement of the fiber, were performed by vertical three-point bending at the free suspended part. A plateau tip was chosen to achieve stable contact and longer working distance for performing larger deformation, enabling intensified reversible SMPA of single fibers. In this way, programming strains of 39 ± 1\% or 46 ± 1\% were realized for fiber with a diameter of 1 ± 0.2 µm and 300 ± 50 nm, which were bent at 80 °C and fixed at 10 °C. Values for the reversible elongation of εrev = 3.4 ± 0.1\% and 10.5 ± 0.1\% were obtained for a single micro and nanofiber respectively between 10 and 60 °C. The higher actuation effect observed for nanofiber demonstrated that the highly compact and oriented crystallites in nanofibers, which determined the pronounced εrev compared to the thick microfibers. Besides, a stable reversible actuation of a nanofiber can be tracked by AFM tip up to 10 cycles, indicating a sustainable application can be achieved on the fiber actuators. The findings obtained for cPCL micro-/nano-fibers will help design and evaluate the next generation polymeric microactuators or micromanipulators. The second part of the thesis studies the shape-memory effect (SME) of a single individual SMP micro-object by controlling deformation temperatures during programming and actuation temperatures during reversible change. In this work, microcuboids of crosslinked poly[ethylene-co-(vinyl acetate)] (cPEVA) elastomers with 18 wt\% vinyl acetate (VA) contents were successfully prepared by template-based replication from polydimethylsiloxane (PDMS) mold. The micro-TME and micro-SMPA were observed and studied based on micro-geometry change using optical microscopy (OM) and AFM. Different switching temperatures of shape recovery were achieved from 55 °C to 86 °C by tuning Tp from 55 °C to 100 °C, indicating a successful implementation of micro-TME on individual microcuboid. For micro-SMPA functionalization, microcuboids were deformed by compression at 100 °C and the change in single particle height was monitored during cyclic heating and cooling between various Tseps from 60 °C to 85 °C and 20 °C. The micro-SMPA on a single microcuboid was achieved with a reversible strain in the range of 2 to 7\%, whereby higher compression ratio CR and Tsep induced prominent reversible strain. The results achieved in this work demonstrated the successful functionalization of microcuboids with different SMEs by controlling temperatures during programming and actuation processes. Based on these achievements, such micro-objects can be further designed as on demand switchable microactuators or release systems with adjustable working temperatures. In the last part of the work, a new function of shape-memory polymeric bi-stable 3D structured film was designed and fabricated. The SME and geometrical design of compliant mechanics were merged to enable switching between bi-stable and mono-stable states, which generate snap movement that mimics the Venus flytrap. A truncated tetrahedron structure with a slope angle as a tunable parameter to alter the bi-stability was chosen for the study to combine with SME. It was anticipated that the structured film designed with a slope angle of 30° exhibited mono-stable behavior, and such a structure with a slope angle of 45° exhibited bi-stable behavior. Then the structured SMP film of designed mono-stable shape was successfully fabricated using soft lithography based on 3D printed master molds supported from digital manufacturing. The structured mold was also used in programming the SMP film into the structure with a higher slope angle to attain bi-stability. Finally, the switching between bi-stable and mono-stable states was successfully realized using SME, which introduces snapping movement triggered by heat. The implementation of compliant mechanisms by the SME increased the magnitude of thermally induced reconfiguration without additional external force. To sum up, the results of the thesis support the development of smart objects capable of one-way micro-TME, free-standing reversible actuation, or bi-stability mediated shape-memory reconfiguration. Electrospinning and template-based method were used for fabrication with good control of geometry and low size dispersity. Microscopy methods especially the AFM platform with decent sensitivity was developed for implementation as well as characterization of SME on individual micro-/nanoobjects. Implementation of bi-stability improves the shape transformation amplitude of thermally triggered SMP. These findings can give novel insights for designing polymer-based actuators or soft robotics.}, language = {en} } @phdthesis{Tung2021, author = {Tung, Wing Tai}, title = {Polymeric fibrous scaffold on macro/microscale towards tissue regeneration}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {en} } @phdthesis{Bender2021, author = {Bender, Benedict}, title = {Platform Coring on Digital Software Platforms}, series = {Schriften zur Business Analytics und zum Informationsmanagement}, journal = {Schriften zur Business Analytics und zum Informationsmanagement}, publisher = {Springer}, address = {Wiesbaden}, isbn = {978-3-658-34798-7}, doi = {10.1007/978-3-658-34799-4}, school = {Universit{\"a}t Potsdam}, pages = {XVIII, 252}, year = {2021}, abstract = {Digital software platforms such as iOS or Android evolve quickly. Through regular updates, their set of built-in (core) features increases. While innovation allows strengthening platforms amidst competition, it can hurt contributors when introducing core features that are already provided by third-party developers (Platform Coring). This book addresses the underexplored phenomenon of Platform Coring and provides strategical guidance for platform owners and third-party contributors. Platform owners are well-advised to carefully consider the benefits and risks for their platform ecosystem. The book contributes by highlighting avenues to employ Platform Coring for the competitive advantage of the platform and ecosystem simultaneously.}, language = {en} } @phdthesis{vonKalckreuth2021, author = {von Kalckreuth, Moritz Alexander}, title = {Philosophie der Personalit{\"a}t}, publisher = {Meiner}, address = {Hamburg}, isbn = {978-3-7873-4026-2}, pages = {328}, year = {2021}, abstract = {Die Philosophie der Person tritt mit dem Anspruch an, unser Selbstverst{\"a}ndnis als Individuen artikulieren zu wollen. Wird die g{\"a}ngige Lesart von Personen als rationalen, selbstbewussten Individuen diesem Anspruch wirklich gerecht? In Auseinandersetzung mit unterschiedlichen Ans{\"a}tzen der Gegenwart arbeitet Moritz von Kalckreuth neben der rationalen auch die leibliche, emotionale und soziokulturelle Dimension von Personalit{\"a}t heraus und fragt nach der M{\"o}glichkeit, sie alle in einem „Syntheseversuch" zusammenzuf{\"u}hren. Im Anschluss an Helmuth Plessners Philosophische Anthropologie, Nicolai Hartmanns Neue Ontologie und Max Schelers Ph{\"a}nomenologie lassen sich verschiedene Lesarten von Geist gewinnen, die sich f{\"u}r eine solche Verkn{\"u}pfung der einzelnen Dimensionen von Personalit{\"a}t besonders eignen.}, language = {de} } @phdthesis{Huang2021, author = {Huang, Sichao}, title = {Past and present biodiversity in northeastern Siberia inferred from sedimentary DNA metabarcoding}, school = {Universit{\"a}t Potsdam}, year = {2021}, abstract = {The arctic-boreal treeline is a transition zone from taiga to tundra covering a vast area in Siberia. It often features large environmental gradients and reacts sensitively to changes in the environment. For example, the expansion of shrubs and a northward movement of the treeline are observable in Siberia as a response to the warming climate. The changes in vegetation across the treeline are known to influence the water chemistry in the lakes. This causes further alteration to the composition and diversity of sensitive aquatic organisms such as diatoms and macrophytes. Despite the rising awareness of the complex climate-feedback mechanisms of terrestrial plants, the understanding of their assembly rules and about responses of aquatic biomes in the surrounding treeline lakes is still limited. The goal of this thesis is to examine the previous and present biodiversity of terrestrial and freshwater biomes from the Siberian treeline ecotone, as well as their reactions to environmental changes. In particular, this thesis attempts to examine the performance of applying sedimentary DNA metabarcoding in terrestrial plants, aquatic macrophytes and diatoms, their spatial patterns along the environmental gradients and their temporal patterns throughout the climate transition from the late Pleistocene to Holocene. Sedimentary DNA metabarcoding combined with next-generation sequencing is applied as a primary tool to explore the composition and diversity of terrestrial plants, diatoms and aquatic macrophytes. The main study area is located in Chukotka of northeastern Siberia in the Arctic, a biodiversity hotspot due to its continental location and the diverse habitats of the glacial refugium. The modern diatom diversity was assessed with a specific diatom metabarcoding marker and morphological identification. Both approaches agree to a dominance of Fragilariaceae and Aulacoseiraceae, as well as on the environmental influential indicators of the diatom community. The high diversity of Fragilariaceae identified in the thermokarst lakes is found to follow the vegetation gradient along the treeline, suggesting that diatom metabarcoding can decipher relationships between diatom assemblage shifts and the relevant environmental changes. In particular, the metabarcoding approach detects diversification of fragilarioids in glacial lakes which is not visible using morphology. Sedimentary ancient DNA records indicate a vegetation mosaic of forb-dominated steppe-tundra during 28-19 ka, followed by a shift to dwarf-shrub tundra during 19-14 ka. During the most recent 14 thousand years, the vegetation consists of deciduous shrublands, then a change to boreal forest is observed. Investigations on the alpha diversity of the vegetation show that species richness is unexpectedly highest during pre-LGM, which is likely related to the extensive area that allows for more taxa. The optimum Holocene warming during 9-6 ka is not accompanied by a high richness as widely believed, but with an evenly distributed community by the fulfilment of erect shrubs. Furthermore, changes in taxonomic and phylogenetic diversity show complementary results in understanding community diversity. The composition and richness in the modern macrophytes community from Siberian Arctic and Chinese alpine are best co-influenced by July temperature and electrical conductivity.. Past macrophyte turnover during the late Pleistocene-Holocene is less noticeable in Siberia, whereas a pronounced community change from emergent to submerged plants is detected from Chinese alpine regions at about 14 ka due to increasing temperature and varying water conductivity. Finally, sedimentary DNA metabarcoding is a cost-effective and powerful proxy for ecological application, whereas completeness of the reference library, coverage and resolution of the metabarcoding marker are the major limitations of sedimentary DNA based diversity monitoring. The composition and richness in modern vegetation and macrophytes across broad spatial gradients is constrained by environmental variables, suggesting a potential usage for environmental monitoring. Diatom distributions are driven by different water variables along the treeline. Past records indicate that the shrub coverage has a noticeable influence on the assemblies of both terrestrial plants and aquatic macrophytes, though the shift in macrophyte community is relatively minor in the past 28 thousand years. In the long-term, the shrub expansion may eventually result in a genetically more diverse vegetation community but reduced species richness. When exceeding the optimal temperatures, further warming may lead to a decrease and putative loss of macrophytes and diatoms.}, language = {en} } @phdthesis{Zhao2021, author = {Zhao, Xueru}, title = {Palaeoclimate and palaeoenvironment evolution from the last glacial maximum into the early holocene (23-8 ka BP) derived from Lago Grande di Monticchio sediment record (S Italy)}, pages = {123}, year = {2021}, language = {en} } @phdthesis{Brunacci2021, author = {Brunacci, Nadia}, title = {Oligodepsipeptides as matrix for drug delivery systems and submicron particulate carriers}, school = {Universit{\"a}t Potsdam}, year = {2021}, language = {en} } @phdthesis{Reichmann2021, author = {Reichmann, Robin}, title = {Novel applications of machine learning techniques in epidemiology of age-related diseases}, school = {Universit{\"a}t Potsdam}, pages = {164, xlv}, year = {2021}, language = {en} } @phdthesis{HeywoodJones2021, author = {Heywood Jones, David}, title = {Moses Hirschel and Enlightenment Breslau}, publisher = {Palgrave Macmillan}, address = {Cham}, isbn = {978-3-030-46234-5}, doi = {10.1007/978-3-030-46235-2}, pages = {viii, 264}, year = {2021}, abstract = {Breslau has been almost entirely forgotten in the Anglophone sphere as a place of Enlightenment. Moreover, in the context of the Jewish Enlightenment, Breslau has never been discussed as a place of intercultural exchange between German-speaking Jewish, Protestant and Catholic intellectuals. The story of Moses Hirschel offers us an excellent case-study to investigate the complex reciprocal relationship between Jewish and non-Jewish enlighteners in a prosperous and influential Central European city on the cusp of the 18th century.}, language = {en} } @phdthesis{Zhang2021, author = {Zhang, Heshou}, title = {Magnetic fields in the universe}, school = {Universit{\"a}t Potsdam}, pages = {vi, 107}, year = {2021}, abstract = {The galactic interstellar medium is magnetized and turbulent. The magnetic field and turbulence play important roles in many astrophysical mechanisms, including cosmic ray transport, star formation, etc. Therefore, measurements of magnetic field and turbulence information are crucial for the proper interpretation of astronomical observations. Nonetheless, the magnetic field observation is quite challenging, especially, there is not universal magnetic tracer for diffuse medium. Moreover, the modelling of turbulence can be oversimplified due to the lack of observational tools to diagnose the plasma properties of the turbulence in the galactic interstellar medium. The studies presented in this thesis have addressed these challenges by bridging the theoretical studies of magnetic field and turbulence with numerical simulations and observations. The following research are presented in this thesis. The first observational evidence of the novel magnetic tracer, ground state alignment (GSA), is discovered, revealing the three-dimensional magnetic field as well as 2 orders of magnitude higher precision comparing to previous observational study in the stellar atmosphere of the post-AGB 89 Herculis. Moreover, the application of GSA in the sub-millimeter fine-structure lines is comprehensively studied for different elements and with magnetohydrodynamic simulations. Furthermore, the influence of GSA effect on the spectroscopy is analyzed and it is found that measurable variation will be produced on the spectral line intensity and the line ratio without accounting for the optical pumping process or magnetic field. Additionally, a novel method to measure plasma modes in the interstellar medium, Signatures from Polarization Analysis (SPA), is proposed and applied to real observations. Magneto-sonic modes are discovered in different types of interstellar medium. An explanation is provided for the long-standing mystery, the origin of γ-ray enhanced emission "Cygnus Cocoon", based on the comparison between the outcome of SPA and multi-waveband observational data. These novel methods have strong potentials for broader observational applications and will play crucial roles in future multi-wavelength astronomy.}, language = {en} } @phdthesis{StarkeLiebe2021, author = {Starke-Liebe, Maja}, title = {Leonhard Franks Remigration im geteilten Deutschland der 1950er Jahre}, series = {Epistemata : W{\"u}rzburger wissenschaftliche Schriften; Reihe Literaturwissenschaft}, journal = {Epistemata : W{\"u}rzburger wissenschaftliche Schriften; Reihe Literaturwissenschaft}, number = {948}, publisher = {K{\"o}nigshausen \& Neumann}, address = {W{\"u}rzburg}, isbn = {978-3-82607562-9}, pages = {467}, year = {2021}, abstract = {Leonhard Frank (1882-1961) hat bereits ein an Erfahrungen reiches Leben hinter sich, als er 1950 nach Deutschland zur{\"u}ckkehrt. Das langj{\"a}hrige Exil l{\"a}sst der Schriftsteller nicht zuletzt aufgrund mangelnder Ver{\"o}ffentlichungs- und Verdienstm{\"o}glichkeiten sowie einer rigiden Immigrationsgesetzgebung in den USA hinter sich. Vor allem jedoch zieht es ihn in seine Heimat als das Land seiner Sprache zur{\"u}ck. Und nur hier weiß er sein Publikum, dessen Resonanz er als existenziell empfindet. In dieser Studie werden die Bem{\"u}hungen nachvollzogen, die ein w{\"a}hrend der Weimarer Republik renommierter und {\"o}konomisch erfolgreicher Autor nach dem erzwungenen Exil w{\"a}hrend der Zeit des Nationalsozialismus unternimmt, um als linker Schriftsteller seine Position innerhalb der besonderen literarischen und kulturpolitischen Bedingungen in der BRD und der DDR im Jahrzehnt der 1950er Jahre zu finden. Ausgehend von umfangreichen Archivmaterialien werden die Lebens- und Arbeitsumst{\"a}nde Franks in seinem letzten Lebensjahrzehnt in die jeweiligen biographischen, sozialen, politischen und kulturellen Kontexte gesetzt. Besondere Aufmerksamkeit erf{\"a}hrt dabei die Besonderheit, dass Frank als B{\"u}rger der Bundesrepublik fortdauernde Beziehungen zu Institutionen und Personen in der DDR unterhielt. Aus dieser Konstellation resultiert eingedenk der politisch-historischen Prozesse, in die sie sich einbettete, ein Spannungsfeld, dessen Spezifika transparent gemacht werden.}, language = {de} } @phdthesis{Rettig2021, author = {Rettig, Anja}, title = {Learning to read in German}, school = {Universit{\"a}t Potsdam}, pages = {XXIII, 231, LXXX}, year = {2021}, abstract = {In the present dissertation, the development of eye movement behavior and the perceptual span of German beginning readers was investigated in Grades 1 to 3 (Study 1) and longitudinally within a one-year time interval (Study 2), as well as in relation to intrinsic and extrinsic reading motivation (Study 3). The presented results are intended to fill the gap of only sparse information on young readers' eye movements and completely missing information on German young readers' perceptual span and its development. On the other hand, reading motivation data have been scrutinized with respect to reciprocal effects on reading comprehension but not with respect to more immediate, basic cognitive processing (e.g., word decoding) that is indicated by different eye movement measures. Based on a longitudinal study design, children in Grades 1-3 participated in a moving window reading experiment with eye movement recordings in two successive years. All children were participants of a larger longitudinal study on intrapersonal developmental risk factors in childhood and adolescence (PIER study). Motivation data and other psychometric reading data were collected during individual inquiries and tests at school. Data analyses were realized in three separate studies that focused on different but related aspects of reading and perceptual span development. Study 1 presents the first cross-sectional report on the perceptual span of beginning German readers. The focus was on reading rate changes in Grades 1 to 3 and on the issue of the onset of the perceptual span development and its dependence on basic foveal reading processes. Study 2 presents a successor of Study 1 providing first longitudinal data of the perceptual span in elementary school children. It also includes information on the stability of observed and predicted reading rates and perceptual span sizes and introduces a new measure of the perceptual span based on nonlinear mixed-effects models. Another issue addressed in this study is the longitudinal between-group comparison of slower and faster readers which refers to the detection of developmental patterns. Study 3 includes longitudinal reading motivation data and investigates the relation between different eye movement measures including perceptual span and intrinsic as well as extrinsic reading motivation. In Study 1, a decelerated increase in reading rate was observed between Grades 1 to 3. Grade effects were also reported for saccade length, refixation probability, and different fixation duration measures. With higher grade, mean saccade length increased, whereas refixation probability, first-fixation duration, gaze duration, and total reading time decreased. Perceptual span development was indicated by an increase in window size effects with grade level. Grade level differences with respect to window size effects were stronger between Grades 2 and 3 than between Grades 1 and 2. These results were replicated longitudinally in Study 2. Again, perceptual span size significantly changed between Grades 2 and 3, but not between Grades 1 and 2 or Grades 3 and 4. Observed and predicted reading rates were found to be highly stable after first grade, whereas stability of perceptual span was only moderate for all grade levels. Group differences between slower and faster readers in Year 1 remained observable in Year 2 showing a pattern of stable achievement differences rather than a compensatory pattern. Between Grades 2 and 3, between-group differences in reading rate even increased resulting in a Matthew effect. A similar effect was observed for perceptual span development between Grades 3 and 4. Finally, in Study 3, significant relations between beginning readers' eye movements and their reading motivation were observed. In both years of measurement, higher intrinsic reading motivation was related to more skilled eye movement patterns as indicated by short fixations, longer saccades, and higher reading rates. In Year 2, intrinsic reading motivation was also significantly and negatively correlated with refixation probability. These correlational patterns were confirmed in cross-sectional linear models controlling for grade level and reading amount and including both reading motivation measures, extrinsic and intrinsic motivation. While there were significant positive relations between intrinsic reading motivation and word decoding as indicated by the above stated eye movement measures, extrinsic reading motivation only predicted variance in eye movements in Year 2 (significant for fixation durations and reading rate), with a consistently opposite pattern of effects as compared to intrinsic reading motivation. Finally, longitudinal effects of Year 1 intrinsic reading motivation on Year 2 word decoding were observed for gaze duration, total reading time, refixation probability, and perceptual span within cross-lagged panel models. These effects were reciprocal because all eye movement measures significantly predicted variance in intrinsic reading motivation. Extrinsic reading motivation in Year 1 did not affect any eye movement measure in Year 2, and vice versa, except for a significant, negative relation with perceptual span. Concluding, the present dissertation demonstrates that largest gains in reading development in terms of eye movement changes are observable between Grades 1 and 2. Together with the observed pattern of stable differences between slower and faster readers and a widening achievement gap between Grades 2 and 3 for reading rate, these results underline the importance of the first year(s) of formal reading instruction. The development of the perceptual span lags behind as it is most apparent between Grades 2 and 3. This suggests that efficient parafoveal processing presupposes a certain degree of foveal reading proficiency (e.g., word decoding). Finally, this dissertation demonstrates that intrinsic reading motivation—but not extrinsic motivation—effectively supports the development of skilled reading.}, language = {en} } @phdthesis{Bebnowski2021, author = {Bebnowski, David}, title = {K{\"a}mpfe mit Marx}, series = {Geschichte der Gegenwart}, journal = {Geschichte der Gegenwart}, number = {25}, publisher = {Wallstein}, address = {G{\"o}ttingen}, isbn = {978-3-8353-5031-1}, school = {Universit{\"a}t Potsdam}, pages = {534}, year = {2021}, abstract = {Die Wiederentdeckung des Marxismus durch die Neue Linke: eine spannungsvolle Geschichte.Schon vor 1968, in den 1950er Jahren, entstand eine Neue Linke. Junge akademische Intellektuelle begannen jenseits der polarisierten traditionellen Arbeiterbewegung nach neuen Ankn{\"u}pfungspunkten f{\"u}r ein linkes Denken zu suchen. Neu gegr{\"u}ndete Theoriezeitschriften wurden dabei zu ihren Organisationskernen. In der Theorie fand die Neue Linke gemeinsame {\"U}berzeugungen und verschmolz auch hierdurch zu einer vorgestellten Gemeinschaft. Insbesondere marxistische Theorien wurden wiederentdeckt und neu interpretiert.Mit Marx f{\"u}hrte die Neue Linke gemeinsame K{\"a}mpfe gegen eine »b{\"u}rgerliche« {\"O}ffentlichkeit - mit Marx trug sie aber auch immer st{\"a}rker K{\"a}mpfe untereinander aus. David Bebnowski nutzt die beiden West-Berliner Zeitschriften »Das Argument« und »PROKLA« als Seismographen und Sonden zur Ergr{\"u}ndung der Geschichte der Neuen Linken und des akademischen Marxismus. Dabei wird deutlich, dass »1968« nicht nur f{\"u}r Aufbr{\"u}che steht, sondern ebenso zu Spaltungen f{\"u}hrte, die die Linke bis heute kennzeichnen.}, language = {de} } @phdthesis{Erdmann2021, author = {Erdmann, Julius}, title = {Kultursemiotik digitaler Bildzeichen der tunesischen Revolution}, series = {Communicatio ; 51}, journal = {Communicatio ; 51}, publisher = {de Gruyter}, address = {Berlin}, isbn = {978-3-11-063845-5}, school = {Universit{\"a}t Potsdam}, pages = {XI, 382}, year = {2021}, language = {de} }