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Sawidis Thomas Heinrich Georg Chettri Mukesh K. 《Water, air, and soil pollution》1999,110(1-2):171-179
137Cs activities in mosses collected from four sites in Macedonia, N. Greece were measured for regular periods of time during the last decade following the reactor accident in Chernobyl. Samples taken in 1985 allow to determine the 137Cs contamination before the accident. A clear increase of the cesium interception was observed for about two years after the accident. Later a gradual decrease was detected which depended on various factors such as moss species, location, growth rate and substrate. Higher 137Cs amounts were observed in epilithic (Grimmia) in comparison to epiphytic or epigeic ones ( Encalypta, Tortula). From the studied biotopes Mt. Vermion presented the highest 137Cs activities. The high 137Cs values found 10 yr after Chernobyl suggest that mosses are effective and inexpensive biological detectors of the distribution and burden of fallout radionuclides. 相似文献
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Effects of glycolytic and cytoskeletal inhibitors on phagocytic and nitroblue tetrazolium reductive activities of bovine neutrophils 总被引:1,自引:0,他引:1
Phagocytic and oxidative metabolic activities of bovine blood neutrophils were determined in the presence of glycolytic (NaF) and cytoskeletal (colchicine, cytochalasin B, and prostaglandin E1) inhibitors. Phagocytosis and post-phagocytic oxidative metabolic activity, measured by nitroblue tetrazolium reduction, were determined using zymosan, Escherichia coli, Staphylococcus aureus, or Streptococcus agalactiae. Sodium fluoride (1.25 microM to 1.25 mM concentrations) did not significantly (P greater than 0.05) inhibit phagocytosis of S aureus and Str agalactiae, whereas phagocytosis of zymosan and E coli was significantly (P less than 0.05) inhibited only at 1.25 mM concentration. Colchicine at 1.25 nM to 1.25 microM concentrations significantly inhibited phagocytosis of zymosan and E coli, but not of S aureus and Str agalactiae. Cytochalasin B at 1.25 nM to 1.25 microM concentrations significantly inhibited phagocytosis of zymosan and all 3 bacteria, whereas prostaglandin E1 was noninhibitory at similar concentrations. Nitroblue tetrazolium reduction, in general, was not significantly affected by NaF and cytoskeletal inhibitors. 相似文献
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Scanning electron microscopic features of Haemobartonella felis 总被引:1,自引:0,他引:1
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Observations were made on the value of certain selective media for isolation and identification of staphylococci from milk obtained from individual quarters and farm bulk tanks Aerobic fermentation of mannitol salt was unreliable for identification of coagulase positive strains. Coagulase positive strains tended to clump when grown in tryptose serum broth. Tellurite glycine agar plates were not entirely reliable for the selection of coagulase positive strains. Fibrinogen-tellurite-glycine plates were very useful for the isolation of staphylococci from milk in the presence of other microorganisms and for the simultaneous identification of coagulase positive strains. Plate coagulase tests utilizing fibrinogen tellurite glycine agar corresponded almost perfectly with conventional tube tests. Fibrinolytic strains were not uncommon and were found also among beta hemolysin producing coagulase positive strains. 相似文献
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