file size: 6.81 GB md5: 3075ea04d08fc68b1233cb33a01f44f0
windows 7 gamer edition 64bit torrent
file size: 6.81 GB md5: 3075ea04d08fc68b1233cb33a01f44f0
windows 7 x64 gamer edition torrent
This is a highly optimized Windows 7 DVD ISO with X64 support. These downloads are typically used for personal use. Windows 7 Game Edition E3 Genuine Windows 10 Oct. 18, 2019.This is a highly optimized Windows 7 DVD ISO with X64 support.Ecotoxicity of polyaromatic hydrocarbons in an enriched freshwater bacterial community.
The toxic potential of polycyclic aromatic hydrocarbons (PAHs) to the bacterial community in the shallow, freshwater Lake Ontario (L.O.) sediment was investigated by use of a bioassay. The bioassay was based on the growth of the marine bacterium Pseudomonas putida to the PAH concentrations of the sediments. A survey of 32 PAHs indicated that the L.O. sediment contained high concentrations of low molecular weight, naphthalene-type PAHs. In the sediment microcosms, p-xylene, anthracene, and pyrene had 50% effective concentrations (EC50) in the 10(-7)M to 10(-6)M range. Several naphthalenes, such as 1-methylnaphthalene, 7-methylnaphthalene, 2-methylnaphthalene, 2,6-dimethylnaphthalene, and 2,3,5,6-tetramethylnaphthalene, had EC50's in the 10(-5)M to 10(-4)M range. PAH-contaminated sediments that contained concentrations of anthracene, phenanthrene, fluoranthene, pyrene, and benzo[a]pyrene below 10(-7)M significantly stimulated the growth of the L.O. bacterial community. However, naphthalenes that were found at L.O. sediment concentrations as high as 10(-5)M had no effect on the growth of the bacteria. These results indicate that the PAH-mediated stimulatory effect of the L.O. sediment on the growth of the marine bacteria is mainly due to the naphthalene-type compounds, and that such a stimulatory effect on ac619d1d87
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