Insufficient Cold Resistance as a Possible Reason for the Absence of Darkling Beetles (Coleoptera, Tenebrionidae) in Pleistocene Sediments of Siberia.

The level of diversity and abundance of darkling beetles (Coleoptera, Tenebrionidae) is the main difference between the late Pleistocene and modern insect faunas of arid regions. In the Pleistocene assemblages they are extremely rare, whereas in the modern ones they predominate. It is assumed that the reason for their rarity in fossil entomological complexes is their lack of cold resistance.

The Center of Origin and Colonization Routes of Noble Salmons of the Genus Salmo (Salmonidae, Actinopterigii).

Genetic diversity and colonization routes of noble salmons were studied using a partial nucleotide sequence of the mitochondrial COI gene. The brown trout S. trutta, which is the most ancient species of the genus, was concluded to originate from the modern southeastern Pontic-Caspian area, which is currently inhabited by members of the subspecies S.

Effect of Li, Na and K Modification of Alumina on its Physical and Chemical Properties and Water Adsorption Ability.

The effect of alkali metal (Li, Na, K) incorporation on the morphology and water vapor uptake properties of mesoporous AlO has been studied. The modification of the raw material, pseudoboehmite, represented a mixture of low-temperature phases (γ + η + χ)-AlO, and has been done at low-temperature that does not change the phase ratio. A decrease in specific surface values and an average pores size increase were observed as a result of the introduction of metal cations by impregnation and subsequent thermal treatment.

Selective Liquid-Phase Hydrogenation of a Nitro Group in Substituted Nitrobenzenes over Au/Al O Catalyst in a Packed-Bed Flow Reactor.

A series of substituted nitrobenzenes with the general formula XC H NO (X=Cl, CH=CH , or C(O)CH ) dissolved in toluene were reduced with hydrogen over the 1.9 % Au/Al O catalyst at 60-110 °C and 10-20 bar in a three-phase packed-bed reactor operating in up-flow mode. Under these conditions, hydrogenation of isomeric ClC H NO gives exclusively chloroanilines.

[Variation in the timing of spawning of the Black Sea brown trout Salmo trutta labrax Pallas under artificial and natural conditions].

Analysis of the maturation and spawning times of the Black Sea brown trout bred at the fish-farming plants and inhabiting natural waterways of the Northwestern Caucasus has demonstrated a considerable variation depending on environmental conditions, first and foremost, temperature. This fact, as well as the analysis of literature data, suggests that the duration and timing of the spawning season cannot be used as self-sufficient criteria for identifying species of the genus Salmo.