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排序方式: 共有114条查询结果,搜索用时 15 毫秒
51.
AA Baiomy 《African Journal of Aquatic Science》2016,41(2):181-191
Fish health is affected by water pollution. Oreochromis niloticus collected during summer 2014 from El-Serw, a polluted site on the Nile River, were compared with fish from a reference site, El-Zamalek. Histopathological changes were detected in gill and liver tissue samples using light and electron microscopy. In addition, the degree of DNA damage was measured using the comet assay. To indicate the severity of water pollution at the two sites, physico-chemical properties and heavy metal concentrations were investigated. Gill damage, including lamellar cell hyperplasia and aneurysm, was observed in the fish samples from the polluted site. The livers of fish from the polluted area showed necrosis and an increase in melanomacrophage centres. Histochemical results confirmed a marked rise of gill mucopolysaccharides and a reduction of carbohydrate stored in hepatocytes. Electron microscopy revealed clear alterations in gill and liver tissue of fish from the polluted site. The comet assay showed highly significant DNA damage in tilapia collected from the polluted site, compared to those from the reference site. Histopathological biomarkers and the comet assay may therefore be sensitive indicators of exposure to mixtures of aquatic pollutants in Nile tilapia. 相似文献
52.
53.
M. S. Goncharenko A. I. Tkachenko N. V. Khmil S. M. Murzaeva M. O. Korobeynikova E. I. Lezhnev O. V. Kolomytkin G. D. Mironova 《Biochemistry (Moscow) Supplemental Series A: Membrane and Cell Biology》2017,11(1):77-81
In this work, effects of manganese on respiration of rat liver mitochondria and the rate of K+ outflow from rat erythrocytes are studied in a broad range of concentrations. It is shown that manganese ions at low concentrations (1 × 10–7–3 × 10–5 М) inhibit K+ outflow from rat erythrocytes; this can be used to prevent their lysis. At high concentrations (1 × 10–4–1 × 10–3 M), manganese activates K+ outflow from the erythrocytes but inhibits the valinomycin-induced outflow of the ion from the erythrocytes. This fact is an indication of manganese influence on physicochemical properties of membranes. At low concentrations manganese does not affect parameters of respiration and oxidative phosphorylation of rat liver mitochondria, while at high concentrations it exerts acceleration of the mitochondrial respiration, i.e., uncouples respiration from phosphorilation and, hence, inhibits ATP synthesis. 相似文献
54.
55.
G N Pluzhnikova N V Sadovnikova Ia Iu Kondrat'ev E I Lezhnev V P Lavrovskaia 《Biulleten' eksperimental'no? biologii i meditsiny》1986,102(7):86-88
The data are reported on albumin secretion by rat hepatocytes and insulin secretion by pancreatic beta-cells of newborn rats during cell cultivation on flat synthetic membrane in conditions of continuous medium perfusion. Albumin and insulin secretion by the appropriate cultures was higher in continuous medium perfusion than in the control. Enhanced sensitivity of pancreatic beta-cells to glucose, as compared to the control was revealed. It is concluded that continuous medium perfusion of hepatocytes and pancreatic beta-cells in the primary culture had a favourable effect on albumin and insulin secretion by the appropriate cultures. 相似文献
56.
André M Siqueira Lucas I Coutinho Rafael L Gurgel Willian CS Su Luiz M Carvalho Silvana G Benzecry Aline CC Alencar Márcia AA Alexandre Maria Gra?as C Alecrim Marcus VG Lacerda 《Memórias do Instituto Oswaldo Cruz》2014,109(5):540-545
Plasmodium vivax is the most widespread parasite causing malaria, being
especially prevalent in the Americas and Southeast Asia. Children are one of the
most affected populations, especially in highly endemic areas. However, there are
few studies evaluating the therapeutic response of infants with vivax malaria.
This study retrospectively evaluated the parasitaemia clearance in children
diagnosed with vivax malaria during the first five days of exclusive treatment
with chloroquine (CQ). Infants aged less than six months old had a significantly
slower parasitaemia clearance time compared to the group of infants and children
between six months and 12 years old (Kaplan-Meier survival analysis; Wilcoxon
test; p = 0.004). The impaired clearance of parasitaemia in younger children with
vivax malaria is shown for the first time in Latin America. It is speculated that
CQ pharmacokinetics in young children with vivax malaria is distinct, but this
specific population may also allow the detection of CQ-resistant parasites during
follow-up, due to the lack of previous immunity. 相似文献
57.
Uwe Thissen Suzan Wopereis Sjoerd AA van den Berg Ivana Bobeldijk Robert Kleemann Teake Kooistra Ko Willems van Dijk Ben van Ommen Age K Smilde 《BMC bioinformatics》2009,10(1):52
Background
In the fields of life sciences, so-called designed studies are used for studying complex biological systems. The data derived from these studies comply with a study design aimed at generating relevant information while diminishing unwanted variation (noise). Knowledge about the study design can be used to decompose the total data into data blocks that are associated with specific effects. Subsequent statistical analysis can be improved by this decomposition if these are applied on selected combinations of effects. 相似文献58.
S. V. Murzaeva M. B. Abramova I. I. Popova E. N. Gritsenko G. D. Mironova E. I. Lezhnev 《Biophysics》2010,55(5):727-732
The effect of Hypoxen (HX) on bioenergetic processes in the mitochondria of heart and liver of rats connected with respiration,
generation of hydrogen peroxide and activity of ATP-sensitive K-channel (mitoKATP) has been studied. It is shown that HX in
the range of 0.05–10 μg/mL stimulates respiration, increases the coupling in the respiratory chain, and increases the formation
of H2O2 and energy-dependent swelling associated with potassium transport in mitochondria. HX removes the inhibitory effect of ATP
on the energy-dependent swelling of mitochondria and partially reduces the accumulation of H2O2 in the presence of ATP. The role of antihypoxic and antioxidant action of HX associated with the activation of mitoKATP is discussed. 相似文献
59.
The XI International Rotifer Symposium was held during 11–18 March, 2006 at the National Autonomous University of Mexico Campus Iztacala located at the North Mexico City (Mexico). These triennial international meetings, first organized in Austria by Late Ruttner-Kolisko in September 1976, are gradually becoming the focal point of discussion and collaboration from rotifer workers across the world. The present XI symposium was attended by 125 participants from 20 nations. During this meeting, different themes of rotifer research from morphology to molecular biology were considered. In addition, there were four invited lectures and four workshops covering different themes of the symposium. During the last 30 years, rotifer research has witnessed gradual shift from the conventional morphological taxonomy to molecular and evolutionary systematics. While the basic rotifer ecological studies continue today, applied areas such as ecotoxicology and aquaculture have taken key roles in the recent meetings. The international rotifer meetings provide ample opportunities not only for exchange of ideas and recent research, but also for material and in establishing inter-personal relationships. Over the last 30 years, the number of participants attending the rotifer meetings has increased. 相似文献
60.
N. Venediktova M. Shigaeva S. Belova K. Belosludtsev N. Belosludtseva O. Gorbacheva E. Lezhnev L. Lukyanova G. Mironova 《Molecular and cellular biochemistry》2013,383(1-2):261-269
The role of mitochondria in the inherited or ontogenetically acquired reactions of organism to stress is not studied enough. In the present work, we examined the functional state of the coupled respiratory chain, potassium and calcium transport and rate of hydrogen peroxide production on two rat lines: August and Wistar—which possess different resistance to emotional stress and hypoxia. It was established that the respiration rate and efficiency of oxidative phosphorylation were higher in August rats than in Wistar ones. In August rats, the rate of potassium transport and ATP-dependent mitochondrial swelling as well as the concentration of the ion in the mitochondrial matrix were almost twice as higher comparatively to those parameters in Wistar rats. The rate of H2O2 production was found to be decreased in the mitochondria of August rats. It was also demonstrated that the two rat lines differed by their resistance to the opening of the palmitate/Ca2+-induced pore and by their ability to retain calcium within mitochondria. The paper discusses the involvement of the mitochondrial ATP-dependent potassium channel in the adaptation of animals to adverse effects. 相似文献