Portland Press Ltd.
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The nutrition of the larva of <i>Aëdes aegypti</i> Linnaeus. 4. Protein and amino-acid requirements
Portland Press Ltd. - Tập 43 Số 3 - Trang 379-387 - 1948
The isolation of progesterone and 3:20-<i>allo</i>pregnanolone from ox adrenals
Portland Press Ltd. - Tập 32 Số 11 - Trang 1957-1960 - 1938
Characterization of the stimulatory effect of high-fat diets on peroxisomal <i>β</i>-oxidation in rat liver 1. The effect on rat liver peroxisomal beta-oxidation of feeding diets containing various amounts of dietary oils was investigated. With increasing amounts (5-25%, w/w) of soya-bean oil an apparent, but not statistically significant, increase of 1.5-fold was found both in specific activity, and in total liver activity. Increasing amounts of partially hydrogenated marine oil revealed a sigmoidal dose-response-curve, giving a 4-6-fold increase in the peroxisomal beta-oxidation activity at 20% or more of this oil in the diet. 2. Addition of small amounts of soya-bean oil to the marine-oil diet had no effect on the peroxisomal beta-oxidation activity, but decreased the C20:3(5,8,11) fatty acid/C20:4(5,8,11,14) fatty acid ratio in liver phospholipids from 0.74 to 0.01. 3. Starvation for 2 days led to a 1.5-1.8-fold increase in the peroxisomal beta-oxidation activity in rats previously fed on a standard pelleted diet, but had no effect in rats given high-fat diets. 4. Feeding partially hydrogenated marine oil or partially hydrogenated rape-seed oil resulted in higher activities than the corresponding unhydrogenated oils. 5. No significant differences in the effect on peroxisomal beta-oxidation could be detected between diets containing rape-seed oils with 15 or 45% erucic acid respectively. 6. These findings are discussed in relation to the possible effects of C22:1 and trans fatty acids in the process leading to increased peroxisomal beta-oxidation activity in the liver.
Portland Press Ltd. - Tập 206 Số 2 - Trang 195-202 - 1982
The isolation and properties of a fragment of bovine-serum albumin which retains the ability to combine with rabbit antiserum
Portland Press Ltd. - Tập 66 Số 4 - Trang 677-686 - 1957
The use of radioactive isotopes in immunological investigations. 9. The reactions of antisera to antigens containing multiple determinant groups
Portland Press Ltd. - Tập 60 Số 3 - Trang 370-379 - 1955
Isolation and properties of mesosomal membrane fractions from <i>Micrococcus lysodeikticus</i> 1. A method is described for the isolation of pure mesosomal membrane fractions from Micrococcus lysodeikticus. 2. Plasmolysis of cells, before wall digestion, was necessary for effective mesosome release. 3. The effect of mild shearing forces, temperature and time upon the release of mesosomal membrane from protoplasts was investigated. 4. The optimum yield of mesosomal membranes from stable protoplasts was achieved at 10mm-Mg2+. 5. Mesosomal membrane vesicle fractions prepared at differing Mg2+ concentrations above 10mm were similar in chemical composition. 6. Comparison of the properties of peripheral and mesosomal membrane fractions revealed major differences in the distribution of protein components, membrane phosphorus, mannose and dehydrogenase activities between the two fractions. 7. Only cytochrome b556 was detected in mesosomal membranes, whereas peripheral membranes contained a full complement of cytochromes. 8. Preliminary investigations suggested the localization of an autolytic enzyme(s) in the mesosomal vesicles. 9. The anatomy of mesosomal and peripheral membrane have been compared by the negative-staining and freeze-fracture technique. 10. The results are discussed in relation to a plausible role for the mesosome.
Portland Press Ltd. - Tập 129 Số 4 - Trang 907-917 - 1972
Factors influencing the activity of succinate dehydrogenase in membrane preparations from <i>Micrococcus lysodeikticus</i> 1. Some properties of succinate dehydrogenase [succinate–(acceptor) oxidoreductase, EC 1.3.99.1] in membrane preparations from Micrococcus lysodeikticus (N.C.T.C. 2665) were investigated. 2. In the spectrophotometric assay system adopted the reaction velocity was shown to be proportional to the amount of membrane added. Dichlorophenol-indophenol, reduced photochemically in the presence of phenazine methosulphate, or enzymically by the membrane-bound enzyme, was shown to undergo reoxidation in the dark. 3. The membrane-bound enzyme was found to be inactivated at temperatures above 10°C. 4. The specific activity of membrane-bound succinate dehydrogenase was found to increase between two- and three-fold in diluted membrane preparations equilibrated at 0°C for 6h. Membranes treated with sodium deoxycholate showed no enzyme activation on dilution but displayed maximal activity, all activity being sedimentable at 103000g. The increase in specific activity observed on dilution could be partially inhibited by fixation with glutaraldehyde, or by the presence of bovine serum albumin. 5. The addition of Mg2+ or Ca2+ ions to membrane suspensions caused an overall depression of enzyme activity. 6. The results suggest the presence of an `inhibitor' that affects the expression of membrane bound succinate dehydrogenase activity.
Portland Press Ltd. - Tập 120 Số 2 - Trang 237-243 - 1970
Amino-acid utilization in bacterial growth. 1. Peptide utilization by a leucine-requiring mutant of <i>Escherichia coli</i>
Portland Press Ltd. - Tập 53 Số 1 - Trang 25-30 - 1953
Amino acid utilization in bacterial growth. 2. A study of threonine-isoleucine relationships in mutants of <i>Escherichia coli</i>
Portland Press Ltd. - Tập 57 Số 2 - Trang 338-343 - 1954
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