Landscape-ecological assessment of bird communities in the middle Aldan valley

Studies on the bird fauna of the middle Aldan River valley, a poorly explored area of Russia, have been performed to reveal trends of spatial changes in the group of dominants, faunistic composition, density, species richness, and distribution of bird assemblages by vegetation layers and to identify environmental factors accounting for these trends. The roles of zonal and local landscape-ecological conditions in the formation of bird communities have been compared. The status of rare and endangered species in the study region has been determined. The results are compared with similar data on the lower Maya River valley.     

Several conditions of formation and isolation of violet pigment from culture fluid of Nocardia fructiferi var. ristomycin

A new water-soluble photochromogenic fluorescent violet pigment with the indicator properties was isolated from the culture fluid of Nocardia fructiferi var. ristomycini, strain 76. By its solubility and mobility in various solvent systems and by the absorption spectrum the new pigment is close but not identical to such a pigment as rubrocyanin. The presence of microelements, i.e. iron and magnesium in the medium was shown to be necessary for production of violet pigment.     

Induction of determined oscillations of lactate dehydrogenase activity after rapid heating

It has been found that macroscopic fluctuations of lactatedehydrogenase activity are determined beats: in four series of measurements carried out at different time of the day activity was determined beginning from the 65th minute after defreezing of the enzymic preparation. Practically similar pictures of the variation course with the amplitude about 8% were observed.