Sedimenttexturen der Sohlbankfläche im Naturdenkmal "Saurierfährten Münchehagen" (Berrias), Rehburger Berge : Rippelmarken und Ichnofossilien als Grundlage einer Deutung des Ablagerungsraumes

Die Gesteine des bearbeiteten Aufschlusses, dem Naturdenkmal "Saurierfährten Münchehagen" bei Münchehagen (Rehburger Berge), liegen stratigraphisch in der Bückeberg-Formation des Berrias (Wealden). Aufgeschlossen ist der Hauptsandstein (Wealden 3) . Es werden die Sedimenttexturen der Sohlbankfläche des ehemaligen Steinbruchs analysiert und interpretiert. Vorherrschende Schichtungstypen sind Wellenrippelschichtung und Flaserschichtung. Die Sedimente sind stark bioturbat. Auf mehreren freiliegenden Flächenniveaus der Sohlbank sind Rip- pelmarken zu beobachten, die systematisch vermessen wurden. Danach handelt es sich uro Wellenrippeln und untergeordnet um strömungsüberformte Wellenrippeln durch ablaufendes Wasser. Zahlreiche Merkmale zeigen wiederholtes Auftauchen und Trok- kenfallen an. Tonlagen kennzeichnen zeitweilige Stillwasserbedingungen. Ein ehemals verzweigtes Rinnensystem ist in Relikten erhalten und beweist ebenfalls einen wechselnden Wasserstand (ablaufendes Wasser). Sporadisch kam es im Zuge hochenergetischer Ereignisse zu einem schichtflutartigen Abfließen des Wassers. Eine reiche Ichnofauna ist zu beobachten. Wenige Spurentypen sind vorhanden, die Spurendichte ist jedoch sehr hoch. Es dominieren horizontale oder wenig geneigte Gestaltungswühlgefüge, vertikale Bauten kommen nur untergeordnet vor. Als häufigste Spurentypen treten Thalassinoides, Muensteria, Plano- lites und Pelecypodichnus auf. Die Größe der Ichnofossilien ist meist gering. Die Spuren bilden eine Ichnocoenose aus Ichnofossilien der Cruziana- und untergeordnet der Skolithos- Fazies. Bivalven belegen Brackwasser-Verhältnisse. Dies alles sind Merkmale eines lagunären Ablagerungsraumes, gelegen am Rand eines gezeitenarmen bzw. -losen Nebenmeeres (Niedersächsisches Becken) im Übergang von der fluviatilen in die litorale Fazies im rückwärtigen Bereich eines Barrierensystems. Wahrscheinlich spielte Wind eine entscheidende Rolle als Ursache für Wasserspiegelschwankungen. Die maximale Wassertiefe bei auflandigem Sturm hat vermutlich nicht mehr als 3 - 4 m betragen. Sonst war sie wahrscheinlich deutlich geringer und ermöglichte Dinosauriern ein Durchwaten des Gewässers, wie Fährten auf der Sohlfläche beweisen.

Freie Schulwahl und staatliche Steuerung. Neue Regelungen des Übergangs an weiterführende Schulen

In dem vorliegenden Beitrag werden neuere schulgesetzliche Initiativen erörtert, die u.a. eine Reform des Übertritts aus der Grundschule an weiterführende Schulen beabsichtigen. Diese Bemühungen ordnen sich in die schon lange zu beobachtende Tendenz zur Stärkung der individuellen Rechte von Schülern und Eltern ein, wie sie mit dem Prozeß der Verrechtlichung der Schule in der Bundesrepublik verbunden ist. Eine genauere Betrachtung der entsprechenden Regelungen und einiger dadurch ausgelöster gerichtlicher Konflikte weckt allerdings Zweifel an Voraussetzungen und insbesondere an Ergebnissen der eingeleiteten Politik: Handelt es sich nicht doch um eine versteckte Form der staatlichen Steuerung der Schulwahl? (DIPF/Orig.)

Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia

Soil N availability is constrained by the breakdown of N-containing polymers such as proteins to oligopeptides and amino acids that can be taken up by plants and microorganisms. Excess N is released from microbial cells as ammonium (N mineralization), which in turn can serve as substrate for nitrification. According to stoichiometric theory, N mineralization and nitrification are expected to increase in relation to protein depolymerization with decreasing N limitation, and thus from higher to lower latitudes and from topsoils to subsoils. To test these hypotheses, we compared gross rates of protein depolymerization, N mineralization and nitrification (determined using N-15 pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67 degrees N) to steppe (54 degrees N). The investigated ecosystems differed strongly in N transformation rates, with highest protein depolymerization and N mineralization rates in middle and southern taiga. All N transformation rates decreased with soil depth following the decrease in organic matter content. Related to protein depolymerization, N mineralization and nitrification were significantly higher in mineral than in organic horizons, supporting a decrease in microbial N limitation with depth. In contrast, we did not find indications for a decrease in microbial N limitation from arctic to temperate ecosystems along the transect. Our findings thus challenge the perception of ubiquitous N limitation at high latitudes, but suggest a transition from N to C limitation of microorganisms with soil depth, even in high-latitude systems such as tundra and boreal forest.

Peter Stadler: Pestalozzi. Geschichtliche Biographie. Band 2: Von der Umwälzung zur Restauration. Zürich: Verlag Neue Zürcher Zeitung 1993 [Rezension]

Rezension von: Peter Stadler: Pestalozzi. Geschichtliche Biographie. Band 2: Von der Umwälzung zur Restauration. Zürich: Verlag Neue Zürcher Zeitung 1993, 679 S.

Microbial community composition shapes enzyme patterns in topsoil and subsoil horizons along a latitudinal transect in Western Siberia

Soil horizons below 30 cm depth contain about 60% of the organic carbon stored in soils. Although insight into the physical and chemical stabilization of soil organic matter (SUM) and into microbial community composition in these horizons is being gained, information on microbial functions of subsoil microbial communities and on associated microbially-mediated processes remains sparse. To identify possible controls on enzyme patterns, we correlated enzyme patterns with biotic and abiotic soil parameters, as well as with microbial community composition, estimated using phospholipid fatty acid profiles. Enzyme patterns (i.e. distance-matrixes calculated from these enzyme activities) were calculated from the activities of six extracellular enzymes (cellobiohydrolase, leucine-amino-peptidase, N-acetylglucosaminidase, chitotriosidase, phosphatase and phenoloxidase), which had been measured in soil samples from organic topsoil horizons, mineral topsoil horizons, and mineral subsoil horizons from seven ecosystems along a 1500 km latitudinal transect in Western Siberia. We found that hydrolytic enzyme activities decreased rapidly with depth, whereas oxidative enzyme activities in mineral horizons were as high as, or higher than in organic topsoil horizons. Enzyme patterns varied more strongly between ecosystems in mineral subsoil horizons than in organic topsoils. The enzyme patterns in topsoil horizons were correlated with SUM content (i.e., C and N content) and microbial community composition. In contrast, the enzyme patterns in mineral subsoil horizons were related to water content, soil pH and microbial community composition. The lack of correlation between enzyme patterns and SUM quantity in the mineral subsoils suggests that SOM chemistry, spatial separation or physical stabilization of SUM rather than SUM content might determine substrate availability for enzymatic breakdown. The correlation of microbial community composition and enzyme patterns in all horizons, suggests that microbial community composition shapes enzyme patterns and might act as a modifier for the usual dependency of decomposition rates on SUM content or C/N ratios. (C) 2015 The Authors. Published by Elsevier Ltd.

Inge Hansen-Schaberg: Minna Specht - Eine Sozialistin in der Landerziehungsheimbewegung (1918 bis 1951). Untersuchung zur pädagogischen Biographie einer Reformpädagogin. (Studien zur Bildungsreform. Bd. 22). Frankfurt a.M./Bern: Lang 1992 [Rezension]

Rezension von: Inge Hansen-Schaberg: Minna Specht - Eine Sozialistin in der Landerziehungsheimbewegung (1918 bis 1951). Untersuchung zur pädagogischen Biographie einer Reformpädagogin. (Studien zur Bildungsreform. Bd. 22). Frankfurt a.M./Bern: Lang 1992, 406 S.

A single theoretical framework for circular features processing in humans: orientation and direction of motion compared

Common computational principles underlie processing of various visual features in the cortex. They are considered to create similar patterns of contextual modulations in behavioral studies for different features as orientation and direction of motion. Here, I studied the possibility that a single theoretical framework, implemented in different visual areas, of circular feature coding and processing could explain these similarities in observations. Stimuli were created that allowed direct comparison of the contextual effects on orientation and motion direction with two different psychophysical probes: changes in weak and strong signal perception. One unique simplified theoretical model of circular feature coding including only inhibitory interactions, and decoding through standard vector average, successfully predicted the similarities in the two domains, while different feature population characteristics explained well the differences in modulation on both experimental probes. These results demonstrate how a single computational principle underlies processing of various features across the cortices.

Renate Knobel: Der lange Weg zur akademischen Ausbildung in der sozialen Arbeit. Stationen von 1868 bis 1971. Frankfurt a. M., Deutscher Verein für öffentliche und private Fürsorge, 1992. Besprechungen. [...] [Sammelrezension]

Sammelrezension von: 1. Renate Knobel: Der lange Weg zur akademischen Ausbildung in der sozialen Arbeit. Stationen von 1868 bis 1971. Frankfurt a. M., Deutscher Verein für öffentliche und private Fürsorge, 1992. Besprechungen, 105 S. 2. Ute Lange-Appel: Von der allgemeinen Kulturaufgabe zur Berufskarriere im Lebenslauf. Eine bildungshistorische Untersuchung zur Professionalisierung der Sozialarbeit. (Studien zur Erwachsenenbildung. Bd. 11.) Frankfurt a.M./Bern: Lang 1993. 354 S.

Erratum: A single theoretical framework for circular features processing in humans: orientation and direction of motion compared (vol 6, pg 28, 2012)

Erratum to: A single theoretical framework for circular features processing in humans: orientation and direction of motion compared. In: Frontiers in computational neuroscience 6 (2012), 28

Frank-Michael Kuhlemann: Modernisierung und Disziplinierung. Sozialgeschichte des preußischen Volksschulwesens 1794-1872. (Kritische Studien zur Geschichtswissenschaft. Bd. 96.) Göttingen: Vandenhoeck & Ruprecht 1992 [Rezension]

Rezension von: Frank-Michael Kuhlemann: Modernisierung und Disziplinierung. Sozialgeschichte des preußischen Volksschulwesens 1794-1872. (Kritische Studien zur Geschichtswissenschaft. Bd. 96.) Göttingen: Vandenhoeck & Ruprecht 1992. 468 S.

Data of the molecular dynamics simulations of mutations in the human connexin46 docking interface

The structure of hCx26 derived from the X-ray analysis was used to generate a homology model for hCx46. Interacting connexin molecules were used as starting model for the molecular dynamics (MD) simulation using NAMD and allowed us to predict the dynamic behavior of hCx46wt and the cataract related mutant hCx46N188T as well as two artificial mutants hCx46N188Q and hCx46N188D. Within the 50 ns simulation time the docked complex composed of the mutants dissociate while hCx46wt remains stable. The data indicates that one hCx46 molecule forms 5-7 hydrogen bonds (HBs) with the counterpart connexin of the opposing connexon. These HBs appear essential for a stable docking of the connexons as shown by the simulation of an entire gap junction channel and were lost for all the tested mutants. The data described here are related to the research article entitled "The cataract related mutation N188T in human connexin46 (hCx46) revealed a critical role for residue N188 in the docking process of gap junction channels" (Schadzek et al., 2015) [1].

NIR-spectroscopy for bioprocess monitoring & control

The Ingold port adaption of a free beam NIR spectrometer is tailored for optimal bioprocess monitoring and control. The device shows an excellent signal to noise ratio dedicated to a large free aperture and therefore a large sample volume. This can be seen particularly in the batch trajectories which show a high reproducibility. The robust and compact design withstands rough process environments as well as SIP/CIP cycles. Robust free beam NIR process analyzers are indispensable tools within the PAT/QbD framework for realtime process monitoring and control. They enable multiparametric, non-invasive measurements of analyte concentrations and process trajectories. Free beam NIR spectrometers are an ideal tool to define golden batches and process borders in the sense of QbD. Moreover, sophisticated data analysis both quantitative and MSPC yields directly to a far better process understanding. Information can be provided online in easy to interpret graphs which allow the operator to make fast and knowledge-based decisions. This finally leads to higher stability in process operation, better performance and less failed batches.

Ludwig Fertig: Vor-Leben. Bekenntnis und Erziehung bei Thomas Mann. Darmstadt: Wissenschaftliche Buchgesellschaft 1994 [Rezension]

Rezension von: Ludwig Fertig: Vor-Leben. Bekenntnis und Erziehung bei Thomas Mann. Darmstadt: Wissenschaftliche Buchgesellschaft 1994, 312 S.

Symmetry reduction due to gallium substitution in the garnet Li6.43(2)Ga0.52(3)La2.67(4)Zr2O12

Single-crystal structure refinements on lithium lanthanum zirconate (LLZO; Li7La3Zr2O12) substituted with gallium were successfully carried out in the cubic symmetry space group I [Formula: see text]3d. Gallium was found on two lithium sites as well as on the lanthanum position. Due to the structural distortion of the resulting Li6.43(2)Ga0.52(3)La2.67(4)Zr2O12 (Ga-LLZO) single crystals, a reduction of the LLZO cubic garnet symmetry from Ia[Formula: see text] d to I [Formula: see text]3d was necessary, which could hardly be analysed from X-ray powder diffraction data.

Burkhard Poste: Schulreform in Sachsen 1918-1923. Eine vergessene Tradition deutscher Schulgeschichte. (Studien zur Bildungsreform. Bd. 20.) Frankfurt a.M./Bern: Lang 1993 [Rezension]

Rezension von: Burkhard Poste: Schulreform in Sachsen 1918-1923. Eine vergessene Tradition deutscher Schulgeschichte. (Studien zur Bildungsreform. Bd. 20.) Frankfurt a.M./Bern: Lang 1993, 654 S.