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231.
G. H. Shull 《Molecular & general genetics : MGG》1911,5(1):331-332
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Structure, partial elemental composition, and size of Thiopedia rosea cells and platelets 总被引:1,自引:0,他引:1
The phototrophic purple sulfur bacterium Thiopedia rosea forms multicellular, gas-vacuolate, regular, flat aggregates (platelets, sheets) held together by slime. Platelets found in eutrophic water consisted of slime (85% of the total wet volume) and 16 cells, while the gas-filled vacuole occupied 44% of the volume of a single wet cell. Individual platelet cells contained central spindle-shaped gas vesicles (which together constitute the cell's gas vacuole), intracytoplasmic membrane vesicles (chromatophores), and peripheral sulfur globules. Cells were surrounded by a Gram-negative type cell envelope and were connected to neighboring cells of the same platelet by mostly unstructured slime. Cells contained detectable amounts of magnesium, phosphorus, sulfur, and potassium as determined by wavelength-dispersive X-ray microanalysis. The large size and relatively low slime density of the platelet, as well as the flat shape, could greatly decrease platelet sedimentation and so stabilize the position of T. rosea within its water column. 相似文献
234.
W G Helferich M H Silva W T Flueck B D Hammock L R Shull 《Comp. Biochem. Physiol. C, Comp. Pharmacol. Toxicol.》1987,88(1):145-149
1. The capacity of liver and lung tissue of black-tailed dear (Odocoileus hemionus columbianus) to biotransform xenobiotics was compared in vitro to the domestic sheep and goat. Donor animals were all females of varying ages. Tissues from the black-tailed deer were collected in the wild. A variety of biotransformation enzymes were measured in both microsomal and cytosolic fractions. 2. Deer liver was lower in total cytochrome P450 concentration, but mono-oxygenase activities were greater compared to sheep and goat. The opposite was true for the lung. 3. Epoxide hydrolase activities were significantly different in deer vs sheep and goat. 4. In general, both hepatic and pulmonary activities were more similar between sheep and goat than either species compared to the deer, however, the magnitude of the hepatic differences did not exceed 5-fold. 5. Based on these limited results, there is no reason to discredit the sheep or goat as a toxicity testing model for deer. 相似文献
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Roger V. Lebo Phillip F. Chance Peter J. Dyck Ma. Theresa Redila-Flores Eric D. Lynch Mitchell S. Golbus Thomas D. Bird Mary Claire King Lee A. Anderson Jeffrey Hall Joop Wiegant Zharong Jiang Paul F. Dazin Hope H. Punnett Steven A. Schonberg Kevin Moore Marcia M. Shull Sandra Gendler Orest Hurko Robert E. Lovelace Norman Latov James Trofatter P. Michael Conneally 《Human genetics》1993,91(3):301
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Hypotheses concerning kinetics of heat activation and of thermal death of bacterial spores were formulated, and were employed to derive equations describing nonlogarithmic thermal death curves. The equations permitted evaluation of the validity of experimental data and provided a means for testing the hypotheses presented. 相似文献
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Molecular Genetics and Genomics - 相似文献
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