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排序方式: 共有898条查询结果,搜索用时 31 毫秒
1.
2.
Toda Hideshige; Arima Toshiyuki; Takahashi Masayuki; Ichimura Shun-ei 《Journal of plankton research》1987,9(1):51-63
Ingestion, respiration, and molting loss rates were measuredover the 3 29°C range in Neomysis intermedia. Weightspecific rates of these physiological processes ranged from2 to 140% body C day1 for ingestion, from 2 to 15% bodyC day1 for respiration, and from 0.1 to 5% body C day1for molting loss. All weight-specific rates showed a logarithmicdecrease with a logarithmic increase in body weight, and a logarithmicincrease with a linear increase in temperature below 20 or 25°C.The effect of temperature, however, was different between thephysiological rates, with a large temperature dependency foringestion (Q10 = 2.6 3.9) and molting loss (Q10 = 2.9 3.6) and a moderate temperature dependency for respiration(Q10 = 1.9 2.1). Calculated assimilation efficiencychanged with body size, but was constant over the temperaturerange examined. Allocation of assimilated materials varied witha change in temperature, reflecting the different temperaturedependence between physiological processes. It was deduced thatthe strong temperature dependency of the growth rate in N. intermediaobserved in the previous studies resulted from the large temperatureeffect on ingestion and assimilation rates, superimposed bythe different allocation of assimilated materials.
1Present address: Department of Botany, University of Tokyo,Hongo, Tokyo 113, Japan 相似文献
3.
Summary In a continuous culture of Bacillus caldolyticus strain SP, which requires maltose as an inducer for production of -amylase in batch culture, a predominant mutant strain M1 which produced high amounts of -amylase in the absence of maltose in batch culture, developed. The change of cell population from strain SP to strain M1 in maltose-casitone medium was linear with time in the transient state after the change from batch to continuous culture at a dilution rate of 0.17 h-1, and was completed in about 11 generations of bacterial growth. The dilution rate effect of continuous culture on -amylase activity was almost the same with both strains SP and M1. The maximum -amylase activity of 380 units/ml was observed at an intermediate dilution rate that was 11.5 times higher than -amylase activity at the end of a batch culture using the same medium. It was deduced that the enhancement of -amylase production in continuous culture was attributed partly to the predominant growth of a mutant strain with higher -amylase productivity. 相似文献
4.
Isolation and Characterization of an Enterobacter cloacae Strain That Reduces Hexavalent Chromium under Anaerobic Conditions 总被引:12,自引:6,他引:6
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Pi-Chao Wang Tsukasa Mori Kohya Komori Masanori Sasatsu Kiyoshi Toda Hisao Ohtake 《Applied microbiology》1989,55(7):1665-1669
An Enterobacter cloacae strain (HO1) capable of reducing hexavalent chromium (chromate) was isolated from activated sludge. This bacterium was resistant to chromate under both aerobic and anaerobic conditions. Only the anaerobic culture of the E. cloacae isolate showed chromate reduction. In the anaerobic culture, yellow turned white with chromate and the turbidity increased as the reduction proceeded, suggesting that insoluble chromium hydroxide was formed. E. cloacae is likely to utilize toxic chromate as an electron acceptor anaerobically because (i) the anaerobic growth of E. cloacae HO1 accompanied the decrease of toxic chromate in culture medium, (ii) the chromate-reducing activity was rapidly inhibited by oxygen, and (iii) the reduction occurred more rapidly in glycerol- or acetate-grown cells than in glucose-grown cells. The chromate reduction in E. cloacae HO1 was observed at pH 6.0 to 8.5 (optimum pH, 7.0) and at 10 to 40°C (optimum, 30°C). 相似文献
5.
Cloning and sequence analysis of a cDNA encoding the Rieske iron-sulfur protein of rat mitochondrial cytochrome bc1 complex 总被引:2,自引:0,他引:2
M Nishikimi Y Hosokawa H Toda H Suzuki T Ozawa 《Biochemical and biophysical research communications》1989,159(1):19-25
We have isolated a cDNA clone for the Rieske iron-sulfur protein of rat cytochrome bc1 complex, by screening a rat liver cDNA expression library using antiserum directed against the corresponding protein of bovine. The amino acid sequence deduced from the nucleotide sequence of the cDNA indicated that the mature polypeptide of the rat protein consists of 196 amino acid residues with a molecular weight of 21,465, and that it is formed as a precursor with an amino-terminal extension. Northern blot analysis indicated that rat liver possibly contains different sizes of mRNAs for the Rieske iron-sulfur protein, and Southern blot analysis demonstrated that rats and mice possess a single gene for this protein. 相似文献
6.
Cloning and sequencing of a cDNA for human mitochondrial ubiquinone-binding protein of complex III 总被引:1,自引:0,他引:1
H Suzuki Y Hosokawa H Toda M Nishikimi T Ozawa 《Biochemical and biophysical research communications》1988,156(2):987-994
The ubiquinone-binding protein (QP-C) is a nuclear-encoded component of ubiquinol-cytochrome c oxidoreductase in the mitochondrial respiratory chain and plays an important role in electron transfer as a ubiquinone-QP-C complex. We obtained a partial cDNA for rat liver QP-C by screening a lambda gt11 rat liver cDNA library using antiserum directed against bovine heart QP-C. Using this cDNA as a probe, a cDNA clone was isolated from a human fibroblast cDNA library by colony hybridization. The total length of the cloned cDNA was 518 base pairs with an open reading frame of 333 base pairs. The 111-amino acid sequence deduced from the nucleotide sequence of the cDNA is 85% homologous to that of bovine QP-C and contains only a single additional amino-terminal methionine. This implies that the human QP-C is synthesized without a presequence which is required for import of most nuclear-encoded mitochondrial proteins into mitochondria. 相似文献
7.
M Kurono Y Hirachi Y Kato Y Toda N Takemasa S Kotani T Takahashi I Tadokoro 《Biken journal》1983,26(3):103-111
Intergenus cell fusion of prokaryotic bacteria was demonstrated for the first time; namely, fusion products doubly resistant to streptomycin and tetracycline were produced by polyethylene glycol treatment of a mixture of the streptomycin-resistant L-form of Pseudomonas aeruginosa and tetracycline-resistant L-form of Escherichia coli. 相似文献
8.
9.
Food preferences and nematode parasitism were studied in natural populations of mycophagousDrosophila in and near Sapporo, northern Japan. Species which preferred fresh mushrooms showed species-specific responses toPleurotus mushrooms:D. pirka bred only onPleurotus cornucopiae, D. trivitata onP. cornucopiae andP. ostreatus, D. trilineata on these twoPleurotus mushrooms and some other mushrooms, whileD. sexvittata bred on a wide variety of mushrooms but seldom onPleurotus mushrooms. Species which preferred decayed mushrooms (D. quadrivittata, D. histrioides, D. testacea and species of thequinaria species-group) showed host preferences different from those of the above species. The rate of parasitism by nematodes was
generally higher in species which prefer decayed mushrooms than in species which prefer fresh mushrooms. Among species which
prefer fresh mushrooms, onlyD. trilineata was parasitized frequently by nematodes. It was not clear what factors determine the rate of parasitism in these mycophagousDrosophila.
D. pirka, D. trivittata andD. trilineata passed through three or four generations per year and entered reproductive diapause in early September in and near Sapporo.
Bionomics of Drosophilidae (Diptera) in Hokkaido, IX. 相似文献
10.
Isolation and characterization of an unprocessed extracellular myeloperoxidase in HL-60 cell cultures 总被引:2,自引:0,他引:2
Extracellular myeloperoxidase of human myeloid leukemia HL-60 cells was purified to homogeneity from its culture supernatant by ammonium sulfate fractionation, CM-Sepharose column chromatography, and monoclonal antibody-Sepharose affinity column chromatography. The yield of enzyme activity was 38% that of the ammonium sulfate fraction. On sodium dodecyl sulfate-polyacrylamide gel electrophoresis, the purified preparation gave a single band of approximately 84 kDa. Analysis of protein blot with antibodies specific for the light and heavy chains of myeloperoxidase indicated that the enzyme contained a light and a heavy chain in a single polypeptide. The amino-terminal amino acid sequence of the enzyme began at amino acid residue 155 of the 745-amino acid sequence predicted from myeloperoxidase cDNA, indicating that the enzyme consisted of 591 amino acids. Sucrose density gradient centrifugation of the enzyme showed that the enzyme was a monomeric form. In pulse-chase experiments on HL-60 cells with [35S]methionine, pulse-labeled myeloperoxidase precursors were shown to be processed to a light chain and a heavy chain of cellular enzyme. During a 3-day chase period, newly formed processed monomeric enzyme was converted to a dimeric form. 相似文献