1 Department of Biology, Faculty of Science, Tarbiat Moallem University, Tehran, Iran. 2 Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran. 3 Department of Applied Chemistry and Microbiology, University of Helsinki, P. O. Box 56, Viikki Biocenter, Viikinkaari 9, FIN-00014 Helsinki, Finland. 4 Department of Biotechnology, Shahid Beheshti University of Medi...

It is shown experimentally that in the solutions of heat-sensitive polymers being in gradient temperature fields, regular self-oscillations may occur. Theoretical interpretation of the observed phenomena is given. The prospects of using data of detected waves in solar power engineering are discussed.

The filamentous cyanobacterium Anabaena (Nostoc) sp. strain PCC 7120 responds to starvation for fixed nitrogen by producing a semiregular pattern of nitrogen-fixing cells called heterocysts. Overexpression of the hetY gene partially suppressed heterocyst formation, resulting in an abnormal heterocyst pattern. Inactivation of hetY increased the time required for heterocyst maturation and caused ...

BACKGROUND The cyanobacterial genus Nostoc includes several species forming centimetre-large gelatinous colonies in nutrient-poor freshwaters and harsh semi-terrestrial environments with extended drought or freezing. These Nostoc species have filaments with normal photosynthetic cells and N2-fixing heterocysts embedded in an extensive gelatinous matrix of polysaccharides and many other organic ...

Two new species, Gnaphosa koponeni sp. n. (♂♀, Tuva, Russia) and G. tunevae sp. n. (♀, Mongolia) are described. New figures and distribution data are provided for G. gracilior Kulczyński, 1901, G. kansuensis Schenkel, 1963, G. mandschurica Schenkel, 1963, G. sticta Kulczyński, 1908, G. stoliczkai O. Pickard-Cambridge, 1885 and G. wiehlei Schenkel, 1963. Additional morphological evidence is prov...

intra-specific diversity in free-living terrestrial protists (Euglyphida: Assulina) Enrique Lara*, Thierry J. Heger , Rodrigo Scheihing and Edward A. D. Mitchell 1 Laboratory of Soil Biology, Institute of Biology, University of Neuchâtel, Rue Emile Argand 11, 2000 Neuchâtel, Switzerland, 2 WSL, Swiss Federal Institute for Forest, Snow and Landscape Research, Ecosystem Boundaries Research Unit, ...