This article provides information on microorganisms, plants and California red worms used in the production of biohumus, which are main organic components some cultivated soils Bukhara oasis. Also, services plants, animals living organisms soil, increasing soil fertility described, importance that provide life factors for each biocenosis normal growth development is revealed.

Proper diet is critical for laboratory-reared animals, as it may affect not only their welfare, but also experimental results. Amphipods (Crustacea: Amphipoda) play important roles in ecosystems and are often used environmental research. Endemic amphipods from the ancient Lake Baikal promising laboratory bioassays; however, there currently no cultures. In this work, we determine how different d...

We first consider the following problem. We are given a fixed perfect matching M of [n] and we add random edges one at a time until there is a Hamilton cycle containing M . We show that w.h.p. the hitting time for this event is the same as that for the first time there are no isolated vertices in the graph induced by the random edges. We then use this result for the following problem. We genera...

We show that the 2-edge-colored chromatic number of a class of simple graphs is bounded if and only if the acyclic chromatic number is bounded for this class. Recently, the CSP dichotomy conjecture has been reduced to the case of 2-edge-colored homomorphism and to the case of 2-vertex-colored homomorphism. Both reductions are rather long and follow the reduction to the case of oriented homomorp...