@article{Damaschun2021, author = {Damaschun, Ferdinand}, title = {Christian Gottfried Ehrenberg und die Entwicklung der Mikroskop-Technik im 19. Jahrhundert}, series = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, volume = {XXII}, journal = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, number = {42}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-515218}, pages = {119 -- 134}, year = {2021}, abstract = {Ab Mitte der 1820er Jahre erfuhr die Mikroskop- Technik eine st{\"u}rmische Entwicklung. Dadurch, dass es gelang, nach und nach die optischen Fehler zu korrigieren, verbesserte sich die Aufl{\"o}sung bis zum Ende des Jahrhunderts um den Faktor 10 von 3 μm auf 0,3 μm. Um 1820 begann Christian Gottfried Ehrenberg mit mikroskopischen Untersuchungen. Er nutzte zun{\"a}chst ein einfaches N{\"u}rnberger Mikroskop. 1832 erwarb er ein Mikroskop aus der Berliner Werkstatt von Pistor \& Schiek, das er dann zeitlebens nutzte. Ein Vergleich der Leistungsf{\"a}higkeit seines Instruments mit der f{\"u}r seine Untersuchungen notwendigen Aufl{\"o}sung zeigt, dass es f{\"u}r seine Untersuchungen vollkommen gen{\"u}gte. F{\"u}r seine Untersuchungsobjekte entwickelte er Pr{\"a}parationstechniken und Aufbewahrungsmethoden f{\"u}r die Dauerpr{\"a}parate. Da er auch die mikroskopischen Abbildungen bis hin zu den Vorlagen f{\"u}r die Kupfertafeln selbst anfertigte, behielt er den gesamten Prozess von der Pr{\"a}paration bis zum Druck der Ergebnisse stets in der Hand.}, language = {de} } @article{Boehme2021, author = {B{\"o}hme, Katrin}, title = {Das große Ganze. Christian Gottfried Ehrenberg und die Gesellschaft Naturforschender Freunde zu Berlin}, series = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, volume = {XXII}, journal = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, number = {42}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-515226}, pages = {155 -- 169}, year = {2021}, abstract = {Als langj{\"a}hriges und aktives Mitglied der Gesellschaft Naturforschender Freunde zu Berlin bestimmte Ehrenberg ihre Aktivit{\"a}ten und ihr Ansehen maßgeblich mit. Seine Beitr{\"a}ge zu den Sitzungen und Schriften und seine Rolle als Bewohner des gesellschaftseigenen Hauses f{\"o}rderten in der GNF sowohl Fortschritt als auch Best{\"a}ndigkeit. Das Ziel der Naturgeschichte des 18. Jahrhunderts, also die Entdeckung, Beschreibung und Bewahrung m{\"o}glichst aller Organismen- und Gesteinsarten, wurde in der GNF bis in die zweite H{\"a}lfte des 19. Jahrhunderts tradiert. Ehrenbergs wissenschaftliche Leistungen, insbesondere seine zahlreichen Entdeckungen mit Hilfe des Mikroskops, stehen ganz in dieser Tradition.}, language = {de} } @article{Ludewig2021, author = {Ludewig, Anna-Dorothea}, title = {Aus dem »chassidischen St{\"u}bchen«}, series = {Briefe als Laboratorium der Literatur im deutsch-j{\"u}dischen Kontext : schriftliche Dialoge, epistolare Konstellationen und poetologische Diskurse}, journal = {Briefe als Laboratorium der Literatur im deutsch-j{\"u}dischen Kontext : schriftliche Dialoge, epistolare Konstellationen und poetologische Diskurse}, publisher = {V\&R unipress}, address = {G{\"o}ttingen}, isbn = {978-3-8471-1296-9}, pages = {167 -- 182}, year = {2021}, language = {de} } @article{KabothBahrBahrZeedenetal.2021, author = {Kaboth-Bahr, Stefanie and Bahr, Andr{\´e} and Zeeden, Christian and Yamoah, Kweku A. and Lone, Mahjoor Ahmad and Chuang, Chih-Kai and L{\"o}wemark, Ludvig and Wei, Kuo-Yen}, title = {A tale of shifting relations}, series = {Scientific Reports}, volume = {11}, journal = {Scientific Reports}, publisher = {Macmillan Publishers Limited, part of Springer Nature}, address = {London}, issn = {2045-2322}, doi = {10.1038/s41598-021-85444-7}, pages = {10}, year = {2021}, abstract = {Understanding the dynamics between the East Asian summer (EASM) and winter monsoon (EAWM) is needed to predict their variability under future global warming scenarios. Here, we investigate the relationship between EASM and EAWM as well as the mechanisms driving their variability during the last 10,000 years by stacking marine and terrestrial (non-speleothem) proxy records from the East Asian realm. This provides a regional and proxy independent signal for both monsoonal systems. The respective signal was subsequently analysed using a linear regression model. We find that the phase relationship between EASM and EAWM is not time-constant and significantly depends on orbital configuration changes. In addition, changes in the Atlantic Meridional Overturning circulation, Arctic sea-ice coverage, El Ni{\~n}o-Southern Oscillation and Sun Spot numbers contributed to millennial scale changes in the EASM and EAWM during the Holocene. We also argue that the bulk signal of monsoonal activity captured by the stacked non-speleothem proxy records supports the previously argued bias of speleothem climatic archives to moisture source changes and/or seasonality.}, language = {en} } @article{SchubarthSpeck2021, author = {Schubarth, Wilfried and Speck, Karsten}, title = {Ergebnisse zur Einsch{\"a}tzung des Referendariatsaus Sicht aller Akteure}, publisher = {Waxmann}, address = {M{\"u}nster}, isbn = {978-3-8309-4332-7}, pages = {254}, year = {2021}, language = {de} } @article{FranzkedelaFuente2021, author = {Franzke, Jochen and de la Fuente, Jos{\´e} M. Ruano}, title = {New Challenges in Local Migrant Integration Policy in Europe}, series = {Local Integration of Migrants Policy}, journal = {Local Integration of Migrants Policy}, publisher = {Palgrave Macmillan}, address = {Cham}, isbn = {978-3-030-50978-1}, issn = {2523-8248}, doi = {10.1007/978-3-030-50979-8_1}, pages = {1 -- 9}, year = {2021}, abstract = {In this introductory chapter, the editors describe the main theoretical basis of analysis of this book and the methodological approach. The core of this book consists of 14 country-specific chapters, which allow a European comparison and show the increasing variance in migration policy approaches within and between European countries. The degree of local autonomy, the level of centralisation and the traditional forms of migration policy are factors that especially influence the possibilities for local authorities to formulate their own integration policies.}, language = {en} } @article{Franzke2021, author = {Franzke, Jochen}, title = {Germany: From Denied Immigration to Integration of Migrants}, series = {Local Integration of Migrants Policy}, journal = {Local Integration of Migrants Policy}, publisher = {Palgrave Macmillan}, address = {Cham}, isbn = {978-3-030-50978-1}, issn = {2523-8248}, doi = {10.1007/978-3-030-50979-8_7}, pages = {107 -- 121}, year = {2021}, abstract = {The chapter begins with a brief historical overview of Germany's transition in the twentieth and twenty-first century from a transit and emigration country to one of immigration. The next part of this chapter looks at the challenges and problems facing German immigration policy within a multi-level federal system. Finally, the chapter gives an analysis of some of the trends in German migration policy since the refugee crisis in 2015, such as changes in the party system and in the concepts underlying migration policies to better manage, control and limit immigration to Germany.}, language = {en} } @article{Franzke2021, author = {Franzke, Jochen}, title = {Integrating Immigrants: Capacities and Challenges for Local Authorities in Europe}, series = {Local Integration of Migrants Policy}, journal = {Local Integration of Migrants Policy}, publisher = {Palgrave Macmillan}, address = {Cham}, isbn = {978-3-030-50978-1}, issn = {2523-8248}, doi = {10.1007/978-3-030-50979-8_17}, pages = {311 -- 333}, year = {2021}, abstract = {This chapter focuses on the relationship between public opinion on migration and its media coverage. Different explanatory models, including individual characteristics, cultural factors and the impact of media and politics, have been proposed to explain public attitudes towards migrants. Understanding the local context is important, as the shares of migrants living in each region and city vary considerably. Providing correct statistical information, stressing the diversity of current migration patterns in Europe and taking part in media and public discussions are ways in which to impact public attitudes at the local level.}, language = {en} } @article{FranzkedelaFuente2021, author = {Franzke, Jochen and de la Fuente, Jos{\´e} M. Ruano}, title = {Conclusions: An Overview of Local Migrant Integration Policies in Europe}, series = {Local Integration of Migrants Policy}, journal = {Local Integration of Migrants Policy}, publisher = {Palgrave Macmillan}, address = {Cham}, isbn = {978-3-030-50978-1}, issn = {2523-8248}, doi = {10.1007/978-3-030-50979-8_18}, pages = {335 -- 344}, year = {2021}, abstract = {As expected, the traditions of national-state migration policies continue to play a very important role, path-dependence in this policy field remains high. The distribution of competences in migration policy and the integration of migrants in the nation states continues to be very different. When implementing integration strategies at grassroots level, the respective policies should be tailored to the profile of both the local migrant community and the native population. Besides better migration management in local administration and the interaction of top-down and bottom-up efforts to integrate migrants is of importance.}, language = {en} } @article{SchenckHarischDietrichetal.2021, author = {Schenck, Marcia C. and Harisch, Immanuel R. and Dietrich, Anne and Burton, Eric}, title = {Introduction}, series = {Navigating Socialist Encounters}, journal = {Navigating Socialist Encounters}, publisher = {de Gruyter}, address = {Oldenburg}, isbn = {978-3-11-062354-3}, doi = {10.1515/9783110623543-001}, pages = {1 -- 58}, year = {2021}, language = {en} } @article{SchenckRaposo2021, author = {Schenck, Marcia C. and Raposo, Francisca}, title = {Socialist Encounters at the School of Friendship}, series = {Navigating Socialist Encounters}, journal = {Navigating Socialist Encounters}, publisher = {de Gruyter}, address = {Oldenburg}, isbn = {978-3-11-062354-3}, doi = {10.1515/9783110623543-009}, pages = {235 -- 246}, year = {2021}, language = {en} } @article{AlbertoSchenck2021, author = {Alberto, Ibraimo and Schenck, Marcia C.}, title = {Paths Are Made by Walking}, series = {Navigating Socialist Encounters}, journal = {Navigating Socialist Encounters}, publisher = {de Gruyter}, address = {Oldenburg}, isbn = {978-3-11-062354-3}, doi = {10.1515/9783110623543-010}, pages = {247 -- 262}, year = {2021}, language = {en} } @article{Pittel2021, author = {Pittel, Harald}, title = {Ali Smith's 'Coming-of-Age' in the age of Brexit}, series = {Brexit and Beyond: Nation and Identity}, journal = {Brexit and Beyond: Nation and Identity}, publisher = {Narr}, address = {T{\"u}bingen}, isbn = {978-3-8233-8414-4}, pages = {121 -- 144}, year = {2021}, language = {en} } @article{ElSafadi2021, author = {El-Safadi, Majd}, title = {Afghanistan-Krieg}, series = {WeltTrends : das außenpolitische Journal}, volume = {29}, journal = {WeltTrends : das außenpolitische Journal}, number = {179}, publisher = {WeltTrends}, address = {Potsdam}, isbn = {978-3-947802-66-1}, issn = {0944-8101}, pages = {68 -- 71}, year = {2021}, language = {de} } @article{Proeve2021, author = {Pr{\"o}ve, Ralf}, title = {Wie mit Nach-Matrix-Sozialisierten umgehen, oder}, series = {Emotionen in Wissensinstitutionen. Zur Bedeutung affektiver Dimensionen in Forschung, Lehre und Unterricht}, journal = {Emotionen in Wissensinstitutionen. Zur Bedeutung affektiver Dimensionen in Forschung, Lehre und Unterricht}, editor = {Ernst, Sebastian}, publisher = {transcript}, address = {Bielefeld}, isbn = {978-3-8376-5735-7}, pages = {71 -- 92}, year = {2021}, language = {de} } @article{FeddersMuenznerWeberetal.2021, author = {Fedders, Ronja and Muenzner, Matthias and Weber, Pamela and Sommerfeld, Manuela and Knauer, Miriam and Kedziora, Sarah and Kast, Naomi and Heidenreich, Steffi and Raila, Jens and Weger, Stefan and Henze, Andrea and Schupp, Michael}, title = {Liver-secreted RBP4 does not impair glucose homeostasis in mice}, series = {The journal of biological chemistry}, volume = {293}, journal = {The journal of biological chemistry}, number = {39}, publisher = {American Society for Biochemistry and Molecular Biology}, address = {Bethesda}, issn = {1083-351X}, doi = {10.1074/jbc.RA118.004294}, pages = {15269 -- 15276}, year = {2021}, abstract = {Retinol-binding protein 4 (RBP4) is the major transport protein for retinol in blood. Recent evidence from genetic mouse models shows that circulating RBP4 derives exclusively from hepatocytes. Because RBP4 is elevated in obesity and associates with the development of glucose intolerance and insulin resistance, we tested whether a liver-specific overexpression of RBP4 in mice impairs glucose homeostasis. We used adeno-associated viruses (AAV) that contain a highly liver-specific promoter to drive expression of murine RBP4 in livers of adult mice. The resulting increase in serum RBP4 levels in these mice was comparable with elevated levels that were reported in obesity. Surprisingly, we found that increasing circulating RBP4 had no effect on glucose homeostasis. Also during a high-fat diet challenge, elevated levels of RBP4 in the circulation failed to aggravate the worsening of systemic parameters of glucose and energy homeostasis. These findings show that liver-secreted RBP4 does not impair glucose homeostasis. We conclude that a modest increase of its circulating levels in mice, as observed in the obese, insulin-resistant state, is unlikely to be a causative factor for impaired glucose homeostasis.}, language = {en} } @article{ThapaWyłomańskaSikoraetal.2021, author = {Thapa, Samudrajit and Wyłomańska, Agnieszka and Sikora, Grzegorz and Wagner, Caroline E. and Krapf, Diego and Kantz, Holger and Chechkin, Aleksei V. and Metzler, Ralf}, title = {Leveraging large-deviation statistics to decipher the stochastic properties of measured trajectories}, series = {New Journal of Physics}, volume = {23}, journal = {New Journal of Physics}, publisher = {Dt. Physikalische Ges. ; IOP}, address = {Bad Honnef ; London}, issn = {1367-2630}, doi = {10.1088/1367-2630/abd50e}, pages = {22}, year = {2021}, abstract = {Extensive time-series encoding the position of particles such as viruses, vesicles, or individualproteins are routinely garnered insingle-particle tracking experiments or supercomputing studies.They contain vital clues on how viruses spread or drugs may be delivered in biological cells.Similar time-series are being recorded of stock values in financial markets and of climate data.Such time-series are most typically evaluated in terms of time-averaged mean-squareddisplacements (TAMSDs), which remain random variables for finite measurement times. Theirstatistical properties are different for differentphysical stochastic processes, thus allowing us toextract valuable information on the stochastic process itself. To exploit the full potential of thestatistical information encoded in measured time-series we here propose an easy-to-implementand computationally inexpensive new methodology, based on deviations of the TAMSD from itsensemble average counterpart. Specifically, we use the upper bound of these deviations forBrownian motion (BM) to check the applicability of this approach to simulated and real data sets.By comparing the probability of deviations fordifferent data sets, we demonstrate how thetheoretical bound for BM reveals additional information about observed stochastic processes. Weapply the large-deviation method to data sets of tracer beads tracked in aqueous solution, tracerbeads measured in mucin hydrogels, and of geographic surface temperature anomalies. Ouranalysis shows how the large-deviation properties can be efficiently used as a simple yet effectiveroutine test to reject the BM hypothesis and unveil relevant information on statistical propertiessuch as ergodicity breaking and short-time correlations.}, language = {en} } @article{Grote2021, author = {Grote, Mathias}, title = {„Aus dem Kleinen bauen sich die Welten" - Christian Gottfried Ehrenbergs {\"o}kologische Mikrobiologie avant la lettre}, series = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, volume = {XXII}, journal = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, number = {42}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, doi = {https://doi.org/10.18443/318}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-515016}, pages = {19 -- 32}, year = {2021}, abstract = {Die Geschichte der Mikrobiologie als Laborwissenschaft des sp{\"a}ten 19. Jahrhunderts hat f{\"u}r Ehrenberg keinen Platz. Unmodern, ja fehlerhaft scheinen die Befunde dieses „Humboldt en miniature", der die Belebtheit von Wasser oder Luft mikroskopisch untersuchte, der Proben aus aller Welt sammelte und so zahlreiche „Infusorien" genannte Mikroben sowie deren Effekte etwa bei Blutwundern beschrieb, deren Beteiligung an Infektionskrankheiten aber verneinte. Zugleich scheint sein {\"o}kologischer Blick auf den Mikrokosmos die Gegenwart auf {\"u}berraschende Weise anzusprechen - einerseits weil Mikroben omnipr{\"a}sentes Faszinosum wie Bedrohung bleiben, andererseits weil viele der Pr{\"a}missen von Pasteur und Koch im Zeitalter der Genomik {\"u}berholt erscheinen. Ausgehend von der zwiesp{\"a}ltigen Position Ehrenbergs fragt dieser Artikel, warum er m{\"o}glicherweise gerade deswegen spannender ist, als ihn die Historiographie bislang hat erscheinen lassen.}, language = {de} } @article{MacKinney2021, author = {MacKinney, Anne Greenwood}, title = {Die Inszenierung naturforschender Gelehrsamkeit beim Sammeln: Christian Gottfried Ehrenbergs und Wilhelm Hemprichs nordafrikanische Forschungsreise (1820 - 1825)}, series = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, volume = {XXII}, journal = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, number = {42}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, doi = {https://doi.org/10.18443/315}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-515021}, pages = {35 -- 51}, year = {2021}, abstract = {Im Jahr 1820 traten zwei Universit{\"a}tsabsolventen, Christian Gottfried Ehrenberg und Wilhelm Hemprich, eine Forschungsreise nach Nordafrika an, die eine der ersten vom preußischen Staat maßgeblich getragenen Reiseunternehmungen darstellt. Wesentliches Ziel der Reise war das Sammeln von naturkundlichen Exemplaren f{\"u}r die junge Berliner Museumslandschaft. Der Beitrag ordnet die afrikanische Forschungsreise in die wissenschaftliche Laufbahn Ehrenbergs ein, der als einziger Reisender {\"u}berlebte, sowie in die Geschichte der Berliner Wissenschaftslandschaft im fr{\"u}hen 19. Jahrhundert. Dabei konzentriert sich der Beitrag auf die Medien - insbesondere Sammlungsverzeichnisse und Sammlungsobjekte - die die Reisenden im Feld einsetzen mussten, um ihre Identit{\"a}t als gelehrte Naturforscher gegen{\"u}ber ihren F{\"o}rderern zu inszenieren und damit ihre Position in der preußischen Wissenschaft strategisch zu sichern.}, language = {de} } @article{Paessler2021, author = {P{\"a}ßler, Ulrich}, title = {Christian Gottfried Ehrenberg und die Biogeographie: Die russisch-sibirische Reise mit Alexander von Humboldt (1829)}, series = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, volume = {XXII}, journal = {HiN : Alexander von Humboldt im Netz = Christian Gottfried Ehrenberg}, number = {42}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-515034}, pages = {75 -- 87}, year = {2021}, abstract = {The Russian-Siberian journey, carried out with Alexander von Humboldt and Gustav Rose in 1829 coincided with a decisive phase in Christian Gottfried Ehrenberg's scientific career. His field diary and the drawings he made on the trip document his intensified focus on the study of microorganisms. The numerous observations on plant and animal geography show how Ehrenberg tested a combination of micro- and macro-perspectives that would shape his research on infusoria in the following decades: In addition to the task of classification at the microscope, Ehrenberg carried out worldwide comparative research on the distribution of microorganisms.}, language = {de} }