Can water mites control populations of planktonic Cladocera?

Predatory pelagic water mites, Piona sp., in a small subtropical lake of Argentina showed rapid numerical response and protection from fish consumption. In experiments, predation rates of Piona on cladocerans equalled those of the principle lake planktivore, Moenkhausia intermedia Eigenmann (about 100 prey · predator^–1 day^–1). As a result, the mites caused a summer depression in the dominant lake zooplankter, Daphnia laevis Birge, evidenced by the analysis of its population dynamics and simple modelling.     

5-alkylvinyl-1,2,4-triazole nucleosides: Synthesis and biological evaluation

Abstract

Some 5-substituted ribavirin analogues have a high antiviral and anticancer activity, but their mechanisms of action are obviously not the same as their parent compound. The SAR studies performed on 3 (5)-substituted 1,2,4-triazole nucleosides have shown a high dependency between the structure of the 3 (5)-substituent and the level of antiviral/anticancer activity. The most active substances of the row contain coplanar with the 1,2,4-triazole ring aromatic substituent which is connected by a rigid ethynyl bond. However, the compounds with the trans-vinyl linker also had antiviral activity. We decided to study the antitumor activity of ribavirin analogues with alkyl/aryl vinyl substituents in the 5th position of the 1,2,4-triazole ring. Protected nucleoside analogues with various 5-alkylvinyl substituents were obtained by Horner-Wadsworth-Emmons reaction from the common precursor and converted to the nucleosides. Arylvinyl nucleosides were synthesised according the reported procedures. All compounds did not show significant antiproliferative activity on several tumour cell lines. Coplanar aromatic motif in the 5-substituent for the anticancer activity manifestation was confirmed.     

Finding of Arcrtic Charr Salvelinus alpinus (Salmonidae) and Sculpin Cottus cf. poecilopus (Cottidae) in the Verkhnyaya Angara basin Near the Divide with the Lena River System: New Data About the Invasion Routes of the Representatives of Lena Ichthyofauna Into Baikal Basin

Journal of Ichthyology - In Lake Amut (the Verkhnyaya Angara drainage basin) the third population of Arctic charr Salvelinus alpinus (L.) in Baikal basin was found, a presumed invader from the Lena...     

Reproductive Strategies and the Origin of Parapatric and Sympatric Forms of Arctic Charr Salvelinus alpinus (Salmonidae) in the System of Lakes Bol’shoe Leprindo and Maloe Leprindo (Northern Transbaikalia)

Journal of Ichthyology - In the system of lakes Bol’shoe Leprindo and Maloe Leprindo (Lena basin, Transbaikalia), spawning of two isolated populations of the dwarf form of Arctic charr...     

Actomyosin preparations obtained from a skeletal muscle tumor of low differentiation using the traditional methods of muscle biochemistry

Tumor actomysion preparations isolated by three different extracting solutions are very similar in composition. A characteristic feature of the preparations obtained is a very rapid presumably proteolytic degradation of their components. It is shown that the major polypeptides of freshly prepared samples are not products of proteolysis. The major protein components of these preparations are identified.