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Grazing rate and feeding selectivity of small and large bodied cladocerans in waters from lakes with different salinity and phytoplankton structure

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Journal of Oceanology and Limnology 2023年第4期41卷 1341-1351页

作者： Egor ZADEREEV tatiana lopatina Svyatoslav OVCHINNIKOV Alexander TOLOMEEV Institute of Biophysics Krasnoyarsk Research CenterSiberian Branch of Russian Academy of SciencesAkademgorodokKrasnoyarsk 660036Russia Siberian Federal University Krasnoyarsk 660041Russia

Cladocera are filter feeders abundant in freshwaters,which consume phytoplankton particles in wide size and taxonomic *** ability of cladocerans to control phytoplankton abundance by grazing is determined by various factors including the characteristics of *** salinization may reduce the strength of top-down grazing control of phytoplankton because of the detrimental effects of salinity on the grazing intensity of *** performed grazing experiments with two species of Cladocera of different body lengths to test their ability to graze on phytoplankton in natural waters differing in salinity and size and taxonomic composition of food *** experiments demonstrated that the grazing rate was mostly controlled by the abundance of phytoplankton in the *** grazing rate was reduced at salinity *** 3 g/L of NaCl in the *** lower grazing rate was observed in the medium with larger phytoplankton *** species predominantly consumed phytoplankton particles with a diameter of 6-12μm,which may shift the size distribution of phytoplankton towards a larger average diameter of *** taxon-specific feeding was also observed,as both species predominantly consumed diatom ***,we found that because of grazing,the size and taxonomic characteristics of phytoplankton are shifted towards a less edible *** detrimental effect of elevated salinity on grazing rate supports growing concern about freshwater salinization negatively affecting water quality,particularly reducing top-down grazing control of phytoplankton.

关键词： selective feeding Daphnia Moina top-down control phytoplankton salinity

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Population-specific effects of temperature and photoperiod on development and body mass in Cassida vibex (Coleoptera: Chrysomelidae)

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Insect Science 2023年第6期30卷 1810-1826页

作者： Dmitry Kutcherov Elena B.lopatina Department of Entomology St.Petersburg State UniversitySt.PetersburgRussia

An interplay of genetic divergence and phenotypic plasticity in shaping geographic variation is increasingly receiving attention in the entomological literature. Two major environmental variables that govern life histories are temperature and photoperiod. Studies of thermal and photoperiodic reaction norms help us understand how insect diversity evolved and how insects respond to environmental change. We studied survival, development, and body mass in three geographic populations of the beetle Cassida vibex reared in the laboratory under several combinations of constant temperature (16, 19, 22, 25, and 28 °C) and photoperiod (short-day and long-day). The three collection sites are situated along a climatic gradient and separated by hundreds of kilometers. Each population subtly but significantly differs in the absolute values of survival rate, developmental rate, and body mass as well as in the thermal and photoperiodic plasticity of these traits, but the geographic differences do not form a latitudinal cline. The southernmost population from a relatively warm climate survives worse at low temperatures than the other two, but the overall survival is lowest in the latitudinally intermediate population. Short-day conditions tend to accelerate postembryonic development and increase the slope of the developmental rate–temperature relationship, especially so in the intermediate population, followed by the southernmost population and then by the northernmost population. The latter, which inhabits a harsh climate, has the fastest and most temperature-sensitive development, regardless of photoperiod, and attains the largest body mass among the three populations. The intermediately located and photoperiodically plastic population, which lives in a cool but mild climate, in contrast, has the smallest body size. Hence, although the importance of short-day conditions as a seasonal cue increases poleward, the photoperiodic responses do not always become more pronounced in colder

关键词： adaptation life history photoperiodism plasticity reaction norm temperature

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Evaluation of Filler Distribution in Particulate Reinforced Composites

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Journal of Materials Science and Chemical Engineering 2015年第7期3卷 108-112页

作者： Kurganova Yuliya lopatina Yuliya Yijin Chen Department of Engineering Technology Bauman Moscow State Technical University Moscow Russia

Aluminum matrix particulate reinforced composites are of significant interest to industry, but it’s difficult to provide stable properties for this group of material. The mechanical properties of metal matrix composites are deeply influenced by the distribution of reinforcement particulates in the matrix. In this paper uniformity of SiC particles distribution in Al-based composites produced by stir casting and powder metallurgy technique is assessed. Analysis is carried out by means of classical and computer quantification metallographic image analysis methods. In addition, we suggest setting hardness distribution in cross section of samples as an indicator of reinforcement distribution uniformity in the matrix.

关键词： Particulate Reinforced Composites Metal Matrix Composites Filler Distribution Quantification Metallographic Analysis Microhardness

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Particulars of Use of New 850 Standard Palladium Alloys for Jewelry Production

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贵金属 2012年第A1期33卷 233-236页

作者： DOVZHENKO N.N. SIDELNIKOV S.B. RUDNITSKY E.A. lopatina E.S. LEONTYEVA E.V. Siberian Federal University KrasnoyarskRussia.

The researches of new palladium-based alloys have been conducted, and the cast and deformed bars for jewels have been obtained. The mechanism of occurrence of welding defects (pore formation) in the production of jewelry chains of silver-containing palladium alloys has been studied. The analysis of the welded joints of the chains, obtained by argon-arc welding, has been carried out, and the properties of metal have been analyzed. Conclusions have been drawn on the possibility of use of the developed palladium alloys, which do not contain silver, for the production of wired semi-products having a low propensity for pore formation in the weld seams.

关键词： palladium alloys jewels chains welding weld seam

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Investigation of the Effect of Local Electrical Stimulation on Cells Cultured on Conductive Single-Walled Carbon Nanotube/Albumin Films

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Journal of Biomaterials and Nanobiotechnology 2012年第3期3卷 377-384页

作者： Ivan I. Bobrinetskiy Alexey S. Seleznev Roman A. Morozov Olga A. lopatina Raisa Y. Podchernyaeva Irina A. Suetina Cell Culter Laboratory Ivanovskiy Institute of Virology Moscow Russia. Center for Probe Microscopy and Nanotechnology National Research University of Electronic Technology Zelenograd Moscow Russia

In this study we have developed a biocompatible current-conductive coating based on carbon nanotubes and bovine serum albumin and have shown its efficiency in culturing cells in vitro. We investigate the proliferation of human embryonic fibroblast (HEF) cells, which were subjected to electrical stimulation when cultured on carbon nanotube surface. A weak increase in proliferation is demonstrated at stimulating field pulses up to 100 mV. It is assumed that the transport mechanism accompanied by higher synthesis of proteins and their polymerization may increase proliferative activity at low voltages. At higher voltages the motility and spatial organization of HEF cell is observed. As a result, a novel technique of supplying the cells with electric field through a system of micro- and nanosized electrodes and a biocompatible composite have been developed.

关键词： Conductive Composite Human Embryonic Fibroblasts Bovine Serum Albumin Electrical Stimulation Proliferation

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