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Editorial
(2013)
Das „Berliner Journal für Soziologie“ beginnt seinen 23. Jahrgang mit einem Heft zum Schwerpunktthema „Ordnung und Gewalt“. Damit geben zwei Begriffe und Konzepte die Perspektive vor, die auf die Konstitutionsproblematik von Gesellschaften verweisen. Das wechselseitige Verhältnis von sozialer Ordnung und Gewalt steht im Mittelpunkt der Beiträge. Einerseits untersuchen sie dieses Wechselverhältnis anhand unterschiedlicher Gewalt- und Ordnungsformen und ihres Zusammenspiels, andererseits thematisieren sie Gewalt sowohl als individuelles, aber gesellschaftlich gerahmtes als auch als kollektives und damit organisiertes soziales Phänomen.
Gewalttätige soziale und politische Auseinandersetzungen, wie sie sich jüngst in den Staaten Nordafrikas und des Nahen Ostens, in den französischen Banlieues oder in London ereignet haben, deuten darauf hin, dass die sozialen Ordnungen, in denen sie entstehen, nicht länger ungeteilt als legitim erachtet werden. Vielmehr werden sie von alternativen Ordnungsvorstellungen infrage gestellt und herausgefordert. Auf die Erklärung derartiger Ordnungskonflikte ist die Soziologie nicht gut vorbereitet. Der Aufsatz skizziert deshalb zunächst Probleme und offene Fragen einer Soziologie der Gewalt – von der klassischen Soziologie über begrifflich-konzeptionelle und theoretisch-methodologische Probleme bis hin zu problematischen modernisierungs- und zivilisationstheoretischen Annahmen über eine künftige Rolle von Gewalt in sozialen Prozessen. Eine Erklärung der genannten Phänomene, so die These, wird nur dann möglich, wenn eine Soziologie der Gewalt den konstitutiven Zusammenhang von Phänomenen physischer Gewalt und Formen sozialer Ordnung in den Mittelpunkt stellt. Eine erklärende Soziologie, die „Warum“- und „Wie“-Fragen nicht auseinanderreißt, muss sich dazu auf die sozialen Mechanismen der Gewaltentstehung in Prozessen der Produktion und Reproduktion sozialer Ordnung konzentrieren.
When playing violent video games, aggressive actions are performed against the background of an originally neutral environment, and associations are formed between cues related to violence and contextual features. This experiment examined the hypothesis that neutral contextual features of a virtual environment become associated with aggressive meaning and acquire the function of primes for aggressive cognitions. Seventy-six participants were assigned to one of two violent video game conditions that varied in context (ship vs. city environment) or a control condition. Afterwards, they completed a Lexical Decision Task to measure the accessibility of aggressive cognitions in which they were primed either with ship-related or city-related words. As predicted, participants who had played the violent game in the ship environment had shorter reaction times for aggressive words following the ship primes than the city primes, whereas participants in the city condition responded faster to the aggressive words following the city primes compared to the ship primes. No parallel effect was observed for the non-aggressive targets. The findings indicate that the associations between violent and neutral cognitions learned during violent game play facilitate the accessibility of aggressive cognitions.
Forschende Lernwerkstatt
(2013)
Deutsche Universitäten erweitern ihre E-Learning-Angebote als Service für die Studierenden und Lehrenden. Diese sind je nach Fakultät unterschiedlich ausgeprägt. Dieser Artikel zeigt, wie durch technische Erweiterung der Infrastruktur, einer Anpassung der Organisationsstruktur und einer gezielten Inhaltsentwicklung eine durchgängige und personalisierbare Lehr- und Lernumgebung (Personal Learning Environment, PLE) geschaffen und damit die Akzeptanz bei den Lehrenden und Studierenden für E-Learning erhöht werden kann. Aus der vorausgehenden, systematischen Anforderungsanalyse können Kennzahlen für die Qualitätssicherung von E-Learning-Angeboten abgeleitet werden.
Bei der hier vorgestellten Anwendung handelt es sich um den Prototypen einer webbasierten Applikation zur Analyse von Nutzungsdaten der AnwenderInnen von eLearning-Angeboten. Die Applikation wurde dabei explizit für unterschiedliche Zielgruppen wie eLearning-AnbieterInnen, Lehrende und WissenschaftlerInnen entworfen. Die Anwendung kann Daten verschiedener Lernplattformen auswerten und nutzt hierbei Methoden des Educational Data Mining. Sie unterstützt dabei sowohl klassische Plattformen mit personalisiertem Zugang sowie offene Plattformen, deren Angebote ohne Registrierung zugänglich sind.
Im Hochschulalltag begegnen sich Dozenten und Studenten als zwei Gruppen mit entgegengesetzten Rollen, z.B. als Lehrende und Lernende, als Forscher und studentische Hilfskräfte. Die Berührungspunkte beider Gruppen eröffnen neue Chancen im Student Life Cycle für zielgerichtete Kooperationen – von der Studierende für Entscheidungsprozesse im Fortgang ihres Studiums und Dozenten für die Gewinnung von Masterstudenten und Doktoranden profitieren können. Kein E-Learning im klassischen Sinn, aber eine praktische Anwendung von Empfehlungstechniken auf Basis eines Campus Management Systems werden Posterbeitrag und Live-Demo vorstellen, mit der zur Zeit verschiedene Zielrichtungen für die Empfehlung von Wahlmodulen und eine kohorten-basierte Informationsaufbereitung im Curricula Support experimentell untersucht werden.
LatteMATHEiato
(2013)
Eine zentrale Schwierigkeit des Lehrens an einer Hochschule besteht in der Heterogenität des Vorwissens der Studierenden. Vor dem Hintergrund, dass jedoch gerade das Vorwissen als einer der stärksten Prädiktoren des Lernerfolgs gilt (Hasselhorn, M., & Gold, A. (2009)), stellt sich die Frage, wie man diese Vorwissensunterschiede der Studienanfänger nivellieren kann. Dieser Bericht zeigt auf, welchen Versuch die Hochschule Furtwangen University (HFU) unternimmt, dem unterschiedlichen Vorwissen der Studierenden im Bereich der Mathematik- Grundlagenveranstaltungen durch medial aufbereitetes Selbstlernmaterial zu begegnen.
Das Projekt „Support for E-Learning“ (SupEr) fokussierte auf die dauerhafte Sicherung eines an der Fachhochschule verankerten Unterstützungsangebotes für Lehrende und Studierende in den Bereichen online-gestützte Lehrveranstaltungen und Veranstaltungsaufzeichnungen (E-Learning). Da dauerhafte personelle Ressourcen an der Fachhochschule begrenzt sind, erprobte das Projekt eine E-Learning Supportstruktur mit Hilfe von Studierenden. Das Supportkonzept betonte die Beratung von Professor/inn/en durch studentische Mitarbeiter/innen und unterschied sich dadurch von Konzepten anderer deutscher Hochschulen.
Der Artikel über das Projekt eTeam der Stabsstelle eLearning stellt einen reinen Praxisbericht dar und befasst sich zunächst mit der Idee, die zur Entwicklung des Vorhabens führte, in dem studentische eLearning-Expertinnen und -Experten Lehrende bei der Umsetzung von Online-Elementen in Lehrveranstaltungen unterstützen. Mit drei Teams in verschiedenen Fakultäten, jeweils bestehend aus zwei studentischen Mitarbeitenden, machte sich das Projekt im Sommersemester (SoSe) 2010 auf den Weg, praktisch an der Ruhr-Universität Bochum (RUB) ausgeführt zu werden. Die Projektvorbereitungen, Erfahrungen aus dem Pilotdurchgang sowie die Sicht der Fakultäten auf das Konzept und den aktuellen Projektstand werden in diesem Artikel beleuchtet und thematisiert.
Der vorliegende Artikel befasst sich mit Adventure-based Learning, einer digitalen, spielbasierten Lernmethode. Das Ziel derartiger Anwendungen ist es, Motivation und Begeisterung der Lernenden zu stimulieren und dadurch Lernprozesse zu unterstützen. Die Frage, inwiefern Adventure-based Learning tatsächlich lernförderliche Mehrwerte induziert, wird anhand einer Fallstudie im Kontext betrieblicher Weiterbildung untersucht. Hierzu wird ein Experiment mit 40 Probanden durchgeführt, in der eine Adventure-based Learning-Anwendung mit einer interaktiven Powerpoint-Präsentation verglichen wird. Die Ergebnisse der Untersuchung deuten darauf hin, dass viele Lernende sich Lernprogramme wünschen, die weniger textlastig sind und mit Adventure-based Learning eine vergleichbare Behaltensleistung erreicht wird.
Einsatz mobiler Endgeräte zur Verbesserung der Lehrqualität in universitären Großveranstaltungen
(2013)
Im vorliegenden Beitrag wird gezeigt, wie mit Hilfe mobiler Endgeräte von Studierenden und einer geeigneten technischen Infrastruktur auch in sehr großen Lehrveranstaltungen mit mehreren hundert Studierenden Lerneraktivierende, kooperative Lernprozesse initiiert werden können. Der Artikel stellt das bereits etablierte methodisch-didaktische Konzept der ‚Peer Instruction‘ (PI) vor, referiert Erkenntnisse zu dessen Lernwirksamkeit und weist auf dessen Einsatzmöglichkeiten in Informatik- und wirtschaftswissenschaftlichen Veranstaltungen hin. Die Architektur sowie die Funktionalität der webbasierten Clients von Studierenden und Dozenten werden erörtert. Erste Evaluationsergebnisse zum Praxiseinsatz dieses Konzepts mit der an der Universität Paderborn entwickelten technischen Infrastruktur werden beschrieben und Perspektiven der Weiterentwicklung des Systems vorgestellt.
Was Bürger bem(a)erken
(2013)
Eingebettet in die aktuelle Open-Government-Debatte gewinnen E-Bürgerdienste weiter an Bedeutung. Zu den Vorreitern internetbasierter Bürgerdienste wird der Brandenburger Bürgerservice Maerker gezählt, da dieser eine einfache Möglichkeit der Kommunikation zwischen Bürger und Verwaltung über Infrastrukturprobleme in der Gemeinde bietet. Auf der Grundlage von Experteninterviews und einer Umfrage unter den teilnehmenden Kommunen evaluieren die Autoren die Einführung und Umsetzung des Maerker Brandenburgs. Im Ergebnis zeigen sich neben einer großen Breite an Akzeptanz und Zustimmung unter den beteiligten Akteuren auch unausgeschöpfte Potenziale zur Verbesserung der Prozesse innerhalb der Verwaltung. Dieser Artikel stellt die Ergebnisse der Evaluation des Maerkers dar und gibt einen Ausblick auf weitere Entwicklungspotenziale.
Hochbegabung
(2013)
Das Thema „Hochbegabung“ erfährt seit mehreren Jahren zunehmende Aufmerksamkeit. Um intellektuell hochbegabte Kinder und Jugendliche angemessen fördern zu können, sind eine rechtzeitige Diagnostik und fundierte Beratung unumgänglich. Das vorliegende Buch bietet einen umfassenden und aktuellen Überblick über die theoretischen Grundlagen von Hochbegabung sowie über Möglichkeiten der Diagnostik und Förderung. Durch eine klare Strukturierung und didaktische Aufbereitung der Inhalte eignet es sich ideal für das (Selbst-)Studium und die berufliche Weiterbildung.
Einleitend setzt sich der Band mit den verschiedenen und sich zum Teil scheinbar widersprechenden Modellvorstellungen von Hochbegabung auseinander. Unterschiedliche Forschungszugänge zum Thema werden anhand prominenter Studien aufgezeigt. Weiterhin thematisiert der Band die Entwicklung von Hochbegabung sowie Eigenschaften von Hochbegabten. Hierzu gehören neben leistungsbezogenen Merkmalen bestimmte Temperamentseigenschaften oder soziale Kompetenzen. Erwartungswidrige Minderleistungen (Underachievement) und mögliche Entwicklungsbesonderheiten, die hoch relevante Themen in der pädagogisch-psychologischen Beratung Hochbegabter darstellen, werden ebenfalls berücksichtigt. Ausführlich erörtern die Autorinnen Möglichkeiten der Diagnostik von hochbegabten Kindern und Jugendlichen und stellen geeignete diagnostische Verfahren vor. Den Abschluss bildet ein Kapitel zu konkreten Fördermöglichkeiten in Kindergarten und Schule.
Die Vorstandsperspektive
(2013)
Business cases (BC) are often used to support information systems (IS) investment evaluation. Unfortunately, business case development (BCD) is a complex task, especially identifying and quantifying the benefits of a proposed investment. Although today’s business case frameworks (BCF) support BCD to some extent, they have several limitations
The aim of the present study was to examine how different types of tracking—
between-school streaming, within-school streaming, and course-by-course
tracking—shape students’ mathematics self-concept. This was done in an
internationally comparative framework using data from the Programme for
International Student Assessment (PISA). After controlling for individual
and track mean achievement, results indicated that generally for students
in course-by-course tracking, high-track students had higher mathematics
self-concepts and low-track students had lower mathematics self-concepts.
For students in between-school and within-school streaming, the reverse pat-
tern was found. These findings suggest a solution to the ongoing debate about
the effects of tracking on students’ academic self-concept and suggest that the
reference groups to which students compare themselves differ according to the
type of tracking.
Biological age
(2013)
Global commons form a comparatively new part of international law, since the term appeared in international discussions and codifications only in the second half of the 20th century. The Common Heritage of Mankind is the corresponding legal principle that can establish an international regime to determine the legal status of non-sovereign territories and to allocate exploitation rights. Its main aim is to balance competing national claims by emphasising mankind’s common interest in the preservation and controlled exploitation of natural re-
sources. Against this background, the chapter sheds a critical light on attempts to transfer the institute of the Common Heritage of Mankind to the sphere of communication. Taking debates revolving around the New World Information and Communication Order in the framework of UNESCO since the late 1970s as a starting point, the author analyses the pitfalls and limits of attempts to establish governance structures for a global information order, including recent attempts to govern the internet.
Die Arbeit befasst sich mit der Schilderung von Paris im Erzählwerk von Delphine de Vigan, unter besonderer Berücksichtigung von zwei Romanen, No et moi (2007) und Les heures souterraines (2009), in denen der Großstadthintergrund einen zentralen Stellenwert erhält. Die Fragestellung richtet sich auf die Aspekte der Stadtdarstellung und auf die Rolle, die unterirdischen Durchgangsräumen dabei zugesprochen wird. Mögliche autoreflexive Deutungen der Stadt-Inszenierung in Bezug auf Sprache und Text, sowie Spuren einer mythisch-realistischen Charakterisierung der Stadt als Projektionsoberfläche des Imaginären
werden zum Schluss betrachtet.
Consciousness for fair consumption : conceptualization, scale development and empirical validation
(2013)
Sustainable consumption means that consumers act in an environmentally and socially responsible manner. Compared with the vast amount of studies concerning environmentally conscious consumer behaviour, relatively little is known about socially conscious consumption. The present paper focuses on fair consumption as an important aspect of social consumption. In our study, consciousness for fair consumption (CFC) is defined as a latent disposition of consumers to prefer products that are produced and traded in compliance with fair labour and business practices. A scale to measure CFC was conceptualized and tested in three independent empirical studies. Two studies were conducted at European universities (2010 and 2012) and used 352 and 362 undergraduate business students respectively. The third study, conducted in 2011, used 141 employees at a European university. The results confirmed the reliability and validity of the new CFC scale across samples. While being moderately related to other aspects of sustainable consumption such as ecological concern and moral reasoning, CFC was significantly distinct from those concepts. Most importantly, it was established that the CFC, as measured by the new CFC scale, is a strong determinant of consumption of fair trade products that has been neglected in existing research.
The “triple bottom line” concept (planet, people, and profit) represents an important guideline for the sustainable, hence future-oriented, development of societies and for the behaviors of all societal members. For institutions promoting societal change, as well as for companies being confronted with growing expectations regarding compelling contributions to sustainable changes, it is of great importance to know if, and to what extent, consumers have already internalized the idea of sustainability. Against the background of existing research gaps regarding a comprehensive measurement of the consciousness for sustainable consumption (CSC), the authors present the result of a scale development. Consciousness was operationalized by weighting personal beliefs with the importance attached by consumers to sustainability dimensions. Four separate tests of the CSC scale indicated an appropriate psychometric quality of the scale and provided support for this new measurement approach that incorporates the environmental, social and economic dimensions of sustainability.
Les représentants du relativisme linguistique du XXème siècle qui se réclament de l’histoire de leur théorie mentionnent normalement Guillaume de Humboldt comme initiateur de l’idée que la manière particulière de penser d’un peuple dépendrait de sa langue. La théorie de Humboldt s’avère, cependant, difficilement maniable dans la recherche linguistique. Malgré une similitude évidente dans certaines positions, comme par exemple les concepts d’‘articulation’ et de ‘valeur’, le renouvellement de la linguistique sur une base saussurienne, au début du XXème siècle, se passait des idées de Humboldt. Il n’y avait que quelques philologues ‘idéalistes’ qui poursuivaient ce type de recherche. Ainsi, Karl Vossler constatait un parallélisme entre la langue et la culture et les considérait comme résultats de la création humaine. Le mécontentement quant à la description des langues selon le paradigme positiviste des néogrammairiens s’articulait nettement.
Le concept d’une vision linguistique du monde fut développé dans la théorie des néohumboldtiens (Weisgerber, Trier et autres) qui affirmaient que l’individu s’approprie le monde à travers la langue. Des différences entre des langues influeraient considérablement sur les facultés cognitives des hommes et sur leur comportement. L’idée humboldtienne de l’energeia se trouvait exclue de ces théories qui aspiraient à un renouvellement de la langue maternelle dans le sens d’une ‘grammaire à partir du contenu’ (inhaltbezogene Grammatik). Ce type de réflexion linguistique se prêtait aussi à une utilisation politique sous le national-socialisme. La théorie de Weisgerber, déclarée comme antiraciste et anti-national-socialiste par l’auteur lui-même, fut considérée comme « mother-tongue fascism » par Christopher Hutton. La relation entre le relativisme linguistique et la doctrine nationale-socialiste est évidente dans les écrits de plusieurs auteurs, par exemple dans « notre langue maternelle comme arme et instrument de la pensée allemande » de Georg Schmidt-Rohr. Il y eut des implications racistes de la théorie de quelques indo-germanistes bien avant 1933.
L’influence des néohumboldtiens s’est poursuivie jusqu’aux années 60, époque où ils durent faire place à des linguistes structuralistes et générativistes. On trouve dans quelques vérifications plus récentes du relativisme linguistique des références à des textes antérieurs à Humboldt. Par exemple, Gumperz et Levison (1996) citent le concours de l’Académie de Berlin sur la question suivante : Quelle est l'influence réciproque des opinions du peuple sur le langage et du langage sur les opinions? Est-ce que cet élargissement de l’horizon de rétrospection a quelque chose à voir avec la conscience d’une portée sociale possible de cette théorie ?
This article investigates whether self-employed households use consumer loans - in particular, instalment loans and overdrafts - to finance business activities. Controlling for financial and nonfinancial household variables, we show that self-employed households particularly use personal overdrafts significantly more often than employee households. When analysing the correlation between consumer loan take-ups and consumption of self-employed in comparison to employee households, we find first evidence that overdrafts are used by self-employed to finance their business as well. This indicates that intermingling constitutes a financing strategy when regular business loans might not be accessible.
Small and medium-sized enterprises (SME) contribute to innovation and economic growth, despite their resource shortages and lack of professional intellectual property (IP) management practices. Drawing on social practice theory and combining insights from recent scholarship on IP strategies and its management, this paper examines the cases of three pharmaceutical SME providing insights into how they appropriate returns on research and development (R&D) investments. It discusses their IP strategies and management practices, examining how the IP management practices are embedded in the firm's organisational structure. Moreover, this paper develops recommendations for SME regarding the professionalisation of their IP management practices.
Bacteriophage HK620 recognizes and cleaves the O-antigen polysaccharide of Escherichia coli serogroup O18A1 with its tailspike protein (TSP). HK620TSP binds hexasaccharide fragments with low affinity, but single amino acid exchanges generated a set of high-affinity mutants with submicromolar dissociation constants. Isothermal titration calorimetry showed that only small amounts of heat were released upon complex formation via a large number of direct and solvent-mediated hydrogen bonds between carbohydrate and protein. At room temperature, association was both enthalpy- and entropy-driven emphasizing major solvent rearrangements upon complex formation. Crystal structure analysis showed identical protein and sugar conformers in the TSP complexes regardless of their hexasaccharide affinity. Only in one case, a TSP mutant bound a different hexasaccharide conformer. The extended sugar binding site could be dissected in two regions: first, a hydrophobic pocket at the reducing end with minor affinity contributions. Access to this site could be blocked by a single aspartate to asparagine exchange without major loss in hexasaccharide affinity. Second, a region where the specific exchange of glutamate for glutamine created a site for an additional water molecule. Side-chain rearrangements upon sugar binding led to desolvation and additional hydrogen bonding which define this region of the binding site as the high-affinity scaffold.
Solid surfaces are modified using photo-crosslinkable copolymers based on oligo(ethylene glycol) methacrylate (OEGMA) bearing 2-(4-benzoylphenoxy) ethyl methacrylate (BPEM) as a photosensitive crosslinking unit. Thin films of about 100 nm are formed by spin-coating these a priori highly biocompatible copolymers onto silicon substrates. Subsequent UV-irradiation assures immobilization and crosslinking of the hydrogel films. Their stability is controlled by the number of crosslinker units per chain and the molar mass of the copolymers. The swelling of the hydrogel layers, as investigated by ellipsometry, can be tuned by the crosslinker content in the copolymer. If films are built from the ternary copolymers of OEGMA, BPEM and 2-(2-methoxyethoxy) ethyl methacrylate (MEO(2)MA), the hydrogel films exhibit a swelling/deswelling transition of the lower critical solution temperature (LCST) type. The observed thermally induced hydrogel collapse is fully reversible and the onset temperature of the transition can be tuned at will by the copolymer composition. Different from analogously prepared thermo-responsive hydrogel films of photocrosslinked poly(N-isopropylacrylamide), the swelling-deswelling transition occurs more gradually, but shows no hysteresis.
This study focuses on the evolutionary relationships among Turkish species of the cave cricket genus Troglophilus. Fifteen populations were studied for sequence variation in a fragment (543 base pairs) of the mitochondrial DNA (mtDNA) 16S rDNA gene (16S) to reconstruct their phylogenetic relationships and biogeographic history. Genetic data retrieved three main clades and at least three divergent lineages that could not be attributed to any of the taxa known for the area. Molecular time estimates suggest that the diversification of the group took place between the Messinian and the Plio-Pleistocene.
In aqueous solution, symmetric triblock copolymers with a thermoresponsive middle block and hydrophobic end blocks form flower-like core-shell micelles which collapse and aggregate upon heating through the cloud point (CP). The collapse of the micellar shell and the intermicellar aggregation are followed in situ and in real-time using time-resolved small-angle neutron scattering (SANS), while heating micellar solutions of a poly((styrene-d(8))-b-(N-isopropyl acrylamide)-b-(styrene-d(8))) triblock copolymer in D2O rapidly through their CP. The influence of polymer concentration as well as of the start and target temperatures is addressed. In all cases, the micellar collapse is very fast. The collapsed micelles immediately form small clusters which contain voids. They densify which slows down or even stops their growth. For low concentrations and target temperatures just above the CP, i.e. shallow temperature jumps, the subsequent growth of the clusters is described by diffusion-limited aggregation. In contrast, for higher concentrations and/or higher target temperatures, i.e. deep temperature jumps, intermicellar bridges dominate the growth. Eventually, in all cases, the clusters coagulate which results in macroscopic phase separation. For shallow temperature jumps, the cluster surfaces stay rough; whereas for deep temperature jumps, a concentration gradient develops at late stages. These results are important for the development of conditions for thermal switching in applications, e.g. for the use of thermoresponsive micellar systems for transport and delivery purposes.
A population of Luisia curtisii (Orchidaceae: Aeridinae) in northern Thailand was studied with regard to pollination biology. Although a high level of self-compatibility was demonstrated experimentally, the very low natural fruit set (1.4-1.9 %) clearly indicated that the species depends on external agents for pollination. Our observations suggest that L. curtisii is pollinated by beetles, as Lema unicolor (Chrysomelidae) and Clinteria ducalis (Scarabaeidae) were the only flower visitors observed to carry pollinaria of this species. The hypothesis of specialised cantharophily is further supported by 2-methylbutyric acid and caproic acid being striking components of the floral scent. Judging from the lack of nectar and the behaviour of visiting beetles, the pollination system seems to rely on food or brood site deception. Retention of the anther on the pollinarium for some time after pollinarium removal probably reduces the frequency of insect-mediated autogamy and geitonogamy in Luisia curtisii-a possibility that was supported by comparative data on (1) the anther retention time and inflorescence visitation time of Lema unicolor and (2) stigma and anther length in the orchid. Existing reports of specialised beetle pollination in orchids are reviewed, and we conclude that there is accumulating evidence that specialised cantharophily is more common in the Orchidaceae than previously assumed.
Birth weight within the normal range is associated with a variety of adult-onset diseases, but the mechanisms behind these associations are poorly understood(1). Previous genome-wide association studies of birth weight identified a variant in the ADCY5 gene associated both with birth weight and type 2 diabetes and a second variant, near CCNL1, with no obvious link to adult traits(2). In an expanded genome-wide association metaanalysis and follow-up study of birth weight (of up to 69,308 individuals of European descent from 43 studies), we have now extended the number of loci associated at genome-wide significance to 7, accounting for a similar proportion of variance as maternal smoking. Five of the loci are known to be associated with other phenotypes: ADCY5 and CDKAL1 with type 2 diabetes, ADRB1 with adult blood pressure and HMGA2 and LCORL with adult height. Our findings highlight genetic links between fetal growth and postnatal growth and metabolism.
The lively debate about speciation currently focuses on the relative importance of factors driving population differentiation. While many studies are increasingly producing results on the importance of selection, little is known about the interaction between drift and selection. Moreover, there is still little knowledge on the spatial-temporal scales at which speciation occurs, that is, arrangement of habitat patches, abruptness of habitat transitions, climate and habitat changes interacting with selective forces. To investigate these questions, we quantified variation on a fine geographical scale analysing morphological (shell) and genetic data sets coupled with environmental data in the land snail Murella muralis, endemic to the Mediterranean island of Sicily. Analysis of a fragment of the mitochondrial DNA cytochrome oxidase I gene (COI) and eight nuclear microsatellite loci showed that genetic variation is highly structured at a very fine spatial scale by local palaeogeographical events and historical population dynamics. Molecular clock estimates, calibrated here specifically for Tyrrhenian land snails, provided a framework of palaeogeographical events responsible for the observed geographical variations and migration routes. Finally, we showed for the first time well-documented lines of evidence of selection in the past, which explains divergence of land snail shell shapes. We suggest that time and palaeogeographical history acted as constraints in the progress along the ecological speciation continuum. Our study shows that testing for correlation among palaeogeography, morphology and genetic data on a fine geographical scale provides information fundamental for a detailed understanding of ecological speciation processes.
Delay tuning was studied in the auditory cortex of Pteronotus quadridens. All the 136 delay-tuned units that were studied responded strongly to heteroharmonic pulse-echo pairs presented at specific delays. In the heteroharmonic pairs, the first sonar call harmonic marks the timing of pulse emission while one of the higher harmonics (second or third) indicates the timing of the echo. Delay-tuned units are organized chronotopically along a rostrocaudal axis according to their characteristic delay. There is no obvious indication of multiple cortical axes specialized in the processing of different harmonic combinations of pulse and echo. Results of this study serve for a straight comparison of cortical delay-tuning between P. quadridens and the well-studied mustached bat, Pteronotus parnellii. These two species stem from the most recent and most basal nodes in the Pteronotus lineage, respectively. P. quadridens and P. parnellii use comparable heteroharmonic target-range computation strategies even though they do not use biosonar calls of a similar design. P. quadridens uses short constant-frequency (CF)/frequency-modulated (FM) echolocation calls, while P. parnellii uses long CF/FM calls. The ability to perform "heteroharmonic" target-range computations might be an ancestral neuronal specialization of the genus Pteronotus that was subjected to positive Darwinian selection in the evolution.
The present study focuses on differences in lingual coarticulation between French children and adults. The specific question pursued is whether 4-5 year old children have already acquired a synergy observed in adults in which the tongue back helps the tip in the formation of alveolar consonants. Locus equations, estimated from acoustic and ultrasound imaging data were used to compare coarticulation degree between adults and children and further investigate differences in motor synergy between the front and back parts of the tongue. Results show similar slope and intercept patterns for adults and children in both the acoustic and articulatory domains, with an effect of place of articulation in both groups between alveolar and non-alveolar consonants. These results suggest that 4-5 year old children (1) have learned the motor synergy investigated and (2) have developed a pattern of coarticulatory resistance depending on a consonant place of articulation. Also, results show that acoustic locus equations can be used to gauge the presence of motor synergies in children.
In recent years, an increasing number of mutations in what would appear to be 'housekeeping genes' have been identified as having unexpectedly specific defects in multicellular organogenesis. This is also the case for organogenesis in seed plants. Although it is not surprising that loss-of-function mutations in 'housekeeping' genes result in lethality or growth retardation, it is surprising when (1) the mutant phenotype results from the loss of function of a 'housekeeping' gene and (2) the mutant phenotype is specific. In this review, by defining housekeeping genes as those encoding proteins that work in basic metabolic and cellular functions, we discuss unexpected links between housekeeping genes and specific developmental processes. In a surprising number of cases housekeeping genes coding for enzymes or proteins with functions in basic cellular processes such as transcription, post-transcriptional modification, and translation affect plant development.
In aquatic food webs, consumers, such as daphnids and copepods, differ regarding their accumulation of polyunsaturated fatty acids (PUFAs). We tested if the accumulation of PUFAs in a seston size fraction containing different consumers and in Daphnia as a separate consumer is subject to seasonal changes in a large deep lake due to changes in the dietary PUFA supply and specific demands of different consumers. We found that the accumulation of arachidonic acid (ARA) in Daphnia increased from early summer to late summer and autumn. However, ARA requirements of Daphnia appeared to be constant throughout the year, because the accumulation of ARA increased when the dietary ARA supply decreased. In the size fraction 140 m, we found an increased accumulation of docosahexaenoic acid (DHA) during late summer and autumn. These seasonal changes in DHA accumulation were linked to changes in the proportion of copepods in this size fraction, which may have increasingly accumulated DHA for active overwintering. We show that consumer-specific PUFA demands can result in seasonal changes in PUFA accumulation, which may influence the trophic transfer of PUFAs within the food web.