Seasonal variations in the component structure of the total phosphorus in the bodies of Antarctic amphipods

Using the procedure of sequential multistage acidic hydrolysis at different temperatures, eight fractions of the total phosphorus were separated from the bodies of Antarctic amphipods. The results showed that the variations of the phosphorus concentrations in the principal fractions within the zooplankton organisms are characterized by seasonal variations complying with the periods of the amphipod life cycle. The prospects of these biochemical studies consist in the discovery of new mechanisms explaining some problems not only of seasonal but also of diurnal physiology of plankton organisms.     

Materials for refining the stratigraphic chart of the Berriasian–Lower Aptian in West Siberia with regard to the clinoform subsurface structure

In light of the new clinoform model of the Neocomian, introduced at the last stratigraphic meeting, it is suggested to distinguish clinoform units instead of formations in the clinoform zone. Formations (12 in number) remain only west of the central part of the Neocomian basin (east-dipping clinoforms). In the eastern and southeastern parts of the basin, all the formations beyond the clinoform zone, which consist mostly of continental sediments, should be united into the Ust’-Taz Group.