Entwicklung technikdidaktischer Kompetenzfacetten im Verlauf schulpraktischer Studien

Der Anspruch einer stärkeren berufspraktischen Orientierung und Aufwertung von schulpraktischen Lerngelegenheiten im Rahmen der Lehrer/-innenausbildung resultierte im rein quantitativen Ausbau des zeitlichen Umfangs sowie qualitativ in neuen Ansätzen der investierten Lernbegleitung seitens der Hochschulen (vgl. Gröschner & Seidel 2012). Bislang fehlt es jedoch an geeigneten Testinstrumenten sowie empirischer Evidenz, ob Praxisphasen die gewünschten Förderwirkungen bei angehenden Lehrpersonen auch einlösen.In einem ersten Schritt widmet sich daher der vorliegende Beitrag einer Instrumentenprüfung mittels einer im Längsschnitt angelegten Untersuchung dieser Forschungsaufgabe: Inwieweit ist das umfassend validierte und auf Unterrichtsvignetten basierende Testinstrument PCK-T in der Lage, die allgemein unterstellte Entwicklung fachdidaktischer Kompetenzfacetten im Verlauf schulpraktischen Studien von Studierenden im allgemein bildenden Fach Technik[1] erfassen zu können?[1] Es wird lediglich die Erfassung zentraler technikdidaktischer Kompetenzfacetten von angehenden Lehrkräften des allgemein bildend ausgerichteten Technikunterrichts beansprucht. Für angehende Lehrkräfte gewerblich-technischer berufsbildender Schulen wäre das Instrument in der hier vorliegenden Ausgestaltungin der Verwendung ungeeignet

Two types of somatostatin-expressing GABAergic interneurons in the superficial layers of the mouse cingulate cortex

Somatostatin-expressing (SOM+), inhibitory interneurons represent a heterogeneous group of cells and given their remarkable diversity, classification of SOM+ interneurons remains a challenging task. Electrophysiological, morphological and neurochemical classes of SOM+ interneurons have been proposed in the past but it remains unclear as to what extent these classes are congruent. We performed whole-cell patch-clamp recordings from 127 GFP-labeled SOM+ interneurons ('GIN') of the superficial cingulate cortex with subsequent biocytin-filling and immunocytochemical labeling. Principal component analysis followed by k-means clustering predicted two putative subtypes of SOM+ interneurons, which we designated as group I and group II GIN. A key finding of our study is the fact that these electrophysiologically and morphologically distinct groups of SOM+ interneurons can be correlated with two neurochemical subtypes of SOM+ interneurons described recently in our laboratory. In particular, all SOM+ interneurons expressing calbindin but no calretinin could be classified as group I GIN, whereas all but one neuropeptide Y- and calretinin-positive interneurons were found in group II

Daseinsvorsorgemonitoring – ein Baustein in der Regionalplanung in NRW

Der Beitrag zeigt methodische Überlegungen, wie die Regionalplanung und -entwicklung in NRW Fragen der Daseinsvorsorge in Regionalplanungsprozesse einbinden kann. Dabei ist die zentrale Frage, wie die Infrastrukturausstattung analysiert werden kann, um eine Ausrichtung der zukünftigen Siedlungsentwicklung auf den Infrastrukturbestand zu unterstützen

In Situ Mass Spectrometric and Kinetic Investigations of Soai's Asymmetric Autocatalysis

Chemical reactions that lead to a spontaneous symmetry breaking or amplification of the enantiomeric excess are of fundamental interest in explaining the formation of a homochiral world. An outstanding example is Soai's asymmetric autocatalysis, in which small enantiomeric excesses of the added product alcohol are amplified in the reaction of diisopropylzinc and pyrimidine‐5‐carbaldehydes. The exact mechanism is still in dispute due to complex reaction equilibria and elusive intermediates. In situ high‐resolution mass spectrometric measurements, detailed kinetic analyses and doping with in situ reacting reaction mixtures show the transient formation of hemiacetal complexes, which can establish an autocatalytic cycle. We propose a mechanism that explains the autocatalytic amplification involving these hemiacetal complexes. Comprehensive kinetic experiments and modelling of the hemiacetal formation and the Soai reaction allow the precise prediction of the reaction progress, the enantiomeric excess as well as the enantiomeric excess dependent time shift in the induction period. Experimental structural data give insights into the privileged properties of the pyrimidyl units and the formation of diastereomeric structures leading to an efficient amplification of even minimal enantiomeric excesses, respectively

How feedback inhibition shapes spike-timing-dependent plasticity and its implications for recent Schizophrenia models

It has been shown that plasticity is not a fixed property but, in fact, changes depending on the location of the synapse on the neuron and/or changes of biophysical parameters. Here we investigate how plasticity is shaped by feedback inhibition in a cortical microcircuit. We use a differential Hebbian learning rule to model spike-timing dependent plasticity and show analytically that the feedback inhibition shortens the time window for LTD during spike-timing dependent plasticity but not for LTP. We then use a realistic GENESIS model to test two hypothesis about interneuron hypofunction and conclude that a reduction in GAD67 is the most likely candidate as the cause for hypofrontality as observed in Schizophrenia

Оценка воздействия дамбы в д. Босоногово Бердюжского района на окружающую среду Тюменской области

В статье рассмотрена положительная и отрицательная оценка воздействия дамбы в д. Босоногово Бердюжского района на окружающую среду Тюменской области.The article considers a positive and negative assessment of the impact of a dam in the village of Bosonogovo, Berdyuga district, on the environment of the Tyumen region

The Bank Vole (Clethrionomys glareolus) - Small Animal Model for Hepacivirus Infection

Many people worldwide suffer from hepatitis C virus (HCV) infection, which is frequently persistent. The lack of efficient vaccines against HCV and the unavailability of or limited compliance with existing antiviral therapies is problematic for health care systems worldwide. Improved small animal models would support further hepacivirus research, including development of vaccines and novel antivirals. The recent discovery of several mammalian hepaciviruses may facilitate such research. In this study, we demonstrated that bank voles (Clethrionomys glareolus) were susceptible to bank vole-associated Hepacivirus F and Hepacivirus J strains, based on the detection of hepaciviral RNA in 52 of 55 experimentally inoculated voles. In contrast, interferon α/β receptor deficient C57/Bl6 mice were resistant to infection with both bank vole hepaciviruses (BvHVs). The highest viral genome loads in infected voles were detected in the liver, and viral RNA was visualized by in situ hybridization in hepatocytes, confirming a marked hepatotropism. Furthermore, liver lesions in infected voles resembled those of HCV infection in humans. In conclusion, infection with both BvHVs in their natural hosts shares striking similarities to HCV infection in humans and may represent promising small animal models for this important human disease

Pumilio2-deficient mice show a predisposition for epilepsy

Epilepsy is a neurological disease that is caused by abnormal hypersynchronous activities of neuronal ensembles leading to recurrent and spontaneous seizures in human patients. Enhanced neuronal excitability and a high level of synchrony between neurons seem to trigger these spontaneous seizures. The molecular mechanisms, however, regarding the development of neuronal hyperexcitability and maintenance of epilepsy are still poorly understood. Here, we show that pumilio RNA-binding family member 2 (Pumilio2;Pum2) plays a role in the regulation of excitability in hippocampal neurons of weaned and 5-month-old male mice. Almost complete deficiency of Pum2 in adult Pum2 gene-trap mice (Pum2 GT) causes misregulation of genes involved in neuronal excitability control. Interestingly, this finding is accompanied by the development of spontaneous epileptic seizures in Pum2 GT mice. Furthermore, we detect an age-dependent increase in Scn1a (Na(v)1.1) and Scn8a (Na(v)1.6) mRNA levels together with a decrease in Scn2a (Na(v)1.2) transcript levels in weaned Pum2 GT that is absent in older mice. Moreover, field recordings of CA1 pyramidal neurons show a tendency towards a reduced paired-pulse inhibition after stimulation of the Schaffer-collateral-commissural pathway in Pum2 GT mice, indicating a predisposition to the development of spontaneous seizures at later stages. With the onset of spontaneous seizures at the age of 5 months, we detect increased protein levels of Na(v)1.1 and Na(v)1.2 as well as decreased protein levels of Na(v)1.6 in those mice. In addition, GABA receptor subunit alpha-2 (Gabra2) mRNA levels are increased in weaned and adult mice. Furthermore, we observe an enhanced GABRA2 protein level in the dendritic field of the CA1 subregion in the Pum2 GT hippocampus. We conclude that altered expression levels of known epileptic risk factors such as Na(v)1.1, Na(v)1.2, Na(v)1.6 and GABRA2 result in enhanced seizure susceptibility and manifestation of epilepsy in the hippocampus. Thus, our results argue for a role of Pum2 in epileptogenesis and the maintenance of epilepsy