Ackerunkrautgesellschaften Des Südwestlichen Polen Und Die Auswertung Ihrer Untersuchung Für Die Landwirtschaft

Zusammenfassung Es wird berichtet über eine vegetationskundliche Untersuchung der Ackerunkrautgesellschaften des Südwestlichen Polen, Fünf Regionen werden unterschieden: Flachland-, Hochland-, Flu?tal-, Gebirgs- und Gebirgskessel-Region. Auf 100 nach der ‘Methode der Goldene Punkte’ bestimmten Punkten im Gebiet wurden ca 1500 pflanzensoziologische Aufnahmen gemacht. Drei Assoziationen:Euphorbio-Melandrietum, Aphano-Matricarietum undTeesdaleo-Arnoseridetum mit verschiedenen Untereinheiten werden beschrieben. Es werden zwei Beispiele der Kartierung dieser Gesellschaften gezeigt. Es wird einiges über die Auswertung dieser Untersuchungen in der Landwirtschaft mitgeteilt. Die Verteilung der Arten der verschiedenen für das Gebiet aufgestellte soziologischen Gruppen über 12 Ackerbenützungskomplexe wird dargestellt: 1 — sehr guter Weizenkomplex, 2 — guter Weizenkomplex, 3 — schwacher Weizenkomplex, 4 — sehr guter Roggenkomplex, 5 — guter Roggenkomplex, 6 — schwacher Roggenkomplex, 7 — Roggen-Lupinekomplex, 8 — Starker Korn-Futterkomplex, 9 — Schwacher Korn-Futterkomplex, 10 — Gebirgs-Weizenkomplex, 11 — Gebirgs-Kornkomplex, 12 — Gebirgs-Hafer-Kartoffelkomplex. Für die Nomenklatur: s. Tabelle 1.     

Lead levels in bone and hair of rats treated with lead acetate

The use of hair and bone as media in evaluation of lead exposure was investigated in this study. For 12–16 wk rats were given tap water containing lead acetate in the following concentrations: 41.7 mg Pb/L, 83.3 mg Pb/L, and 166.6 mg Pb/L. The animals were sacrificed every 4 wk and their tibia bones and hair were collected for determination of lead content. In control animals, the lead level amounted to 1.2 μg/g (range 0.8–1.3 μg/g) and 0.7 μg/g (range 0.4–2.0 μg/g) in bone and hair, respectively. In the treated rats the accumulation of lead in bone and hair occurred in a dose-dependent manner. A positive corelation (r=0.876) was established between the lead levels in bone and hair of the rats. The regression equation was as follows: μg Pb/g bone=0.842×μg Pb/g hair+1.868. After discontinuation of exposure, a significant decrease in the lead content in bone and hair was noticed. About 9 wk after cessation of treatment, the lead content in hair declined to the pre-exposure level, but 64% of the maximal lead concentration did remain in bone. The results of this study indicate that during a continuous exposure the lead level in hair reflects its content in bone. Such phenomena did not occur during the postexposure period.     

Signatures of antagonistic pleiotropy in a bacterial flagellin epitope

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Effects of Artificial Rise of Temperature on Stagnant Waters and Their Biocenoses

A change of the thermal regime results in a variety of reactions of both abiotic and biotic components of the environment. The aim of this paper is to present new data (on Turbellaria, Oligochaeta, Hirudinea, Coleoptera and Hydracarina) on biological responses to the thermal factor discussed in a broad context of literature and, to evaluate their impact on the subsequent ecosystem development. A theoretical interpretation of all phenomena related to this factor is proposed within a widely-conceived theory of adaptation.     

Isoform switching of the sarco(endo)plasmic reticulum Ca2+ pump during differentiation of BC3H1 myoblasts

We have studied the expression of the gene 2 for the sarco(endo)plasmic reticulum Ca2+ pump (SERCA2) in BC3H1 cells. Myogenic differentiation not only activated the SERCA2 expression but it also induced an isoform switch. Undifferentiated myoblasts only expressed the SERCA2b isoform (non-muscle) whereas differentiated myocytes predominantly contained the SERCA2a isoform (cardiac/slow skeletal muscle). The isoform switch was documented by immunoblot analysis with isoform-specific antibodies. This observation was confirmed at the mRNA level by using antisense RNA probes specific for class 1 (SERCA2a) or class 2 (SERCA2b) messengers. The expression of the SERCA2a isoform after differentiation was accompanied by a decreased sensitivity of the Ca2+ uptake in permeabilized cells to the Ca2+ pump inhibitor thapsigargin.     

A complex immune response to flagellin epitope variation in commensal communities

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