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排序方式: 共有101条查询结果,搜索用时 15 毫秒
1.
G I Miagkova P M Demin Iu Iu Belosudtsev D A Zabolotski? R P Evstigneeva 《Bioorganicheskaia khimiia》1987,13(3):415-419
8Z,11Z,14Z-Eicosatriene-5-ynoic acid and its tritium-labelled analogue, [5,6-3H]arachidonic acid, have been synthesized on the basis of acetylenic compounds. [5,6-3H]Arachidonic acid has been used as substrate for the enzymatic synthesis of [5,6-3H]PGE2 and [5,6-3H]PGF2 alpha. 相似文献
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L. P. Antonyuk A. V. Pushkin L. M. Vorobyeva N. A. Solovjeva Z. G. Evstigneeva W. L. Kretovich 《Molecular and cellular biochemistry》1982,47(1):55-57
Summary Multiple molecular forms of glutamine synthetase (GS, EC 6.3.1.2) have been studied in pea seeds of different varieties. The number of GS molecular forms in the seeds proved to be related to their colour. Two GS forms in the green seeds have been found and only one of them in the yellow seeds. Green seeds had chlorophyll content amounted to 0.4% of the total pigment content in the leaves. Chloroplasts, somewhat smaller than those in pea leaves of the same variety, have been isolated from green seeds. The presence of the second GS form in the pea green seeds we relate to the chloroplasts. By electrophoretic mobility both forms of GS from the green seeds are not identical to the chloroplast GS and the cytosol GS of leaves. Thus, we believe pea plant to contain, at least, four GS forms. 相似文献
4.
Evstigneeva ZG Solov'eva NA Sidel'nikova LI 《Prikladnaia biokhimiia i mikrobiologiia》2003,39(6):613-618
Derivatives of methionine sulfoximine (MSO) and phosphinothrycin (PPT), which are analogues of glutamate, exhibit selective herbicidal activity. This effect is accounted for by impairments of nitrogen metabolism, resulting from inhibition of its key enzyme in plants, glutamine synthetase (EC 6.3.1.2). Inhibition of the enzyme causes ammoniac nitrogen to accumulate and terminates the synthesis of glutamine. Changes in the content of these two metabolites (excess ammonium and glutamine deficiency) act in a concert to cause plant death. However, low concentrations of MSO, PPT, and their metabolites produce an opposite effect: glutamine synthetase is activated, with concomitant stimulation of plant growth and productivity. The mechanisms whereby MSO and PPT affect glutamine synthetase activity are discussed in the context of nitrogen metabolism in plants. 相似文献
5.
New derivatives of proto- and deuterohemin IX containing tri- and tetrazole rings were synthesized and characterized. A pronounced antioxidant activity was found for these compounds in the Fe(II)/ascorbate-dependent system of lipid peroxidation in murine liver homogenates. 相似文献
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Mokeev D. I. Volokhina I. V. Telesheva E. M. Evstigneeva S. S. Grinev V. S. Pylaev T. E. Petrova L. P. Shelud’ko A. V. 《Microbiology》2022,91(6):682-692
Microbiology - Polyethylene glycol (PEG 6000) was used to establish osmotic stress conditions during growth of the type strain Azospirillum brasilense Sp7 and its spontaneous variants Sp7.4 and... 相似文献
8.
Synthesis of thioalkyl, thioacetyl and phosphothionyl PAF analogues was carried out starting with corresponding monoalkyl glycerol ethers. The synthetic route was based on preparation of racemic phosphatidylcholines and subsequent hydrolysis with phospholipase A2 to afford isomers having natural configuration. 相似文献
9.
Sergeeva Ya. E. Galanina L. A. Tkachevskaya E. P. Konova I. V. Evstigneeva R. P. 《Microbiology》2001,70(2):158-164
The effect of exogenously added vitamin E and its synthetic analogues (the hydrophilic form of vitamin E and chromans C13and C1) at a concentration of 9.86 × 10–5M on the growth, lipogenic activity, and the fatty acid composition of the eicosapolyenoic acid–synthesizing oomycete Pythium debaryanumwas studied. The effect was found to depend on the molecular structure of particular compounds. For instance, vitamin E and chroman C13stimulated fungal growth, whereas chroman C1inhibited it. The hydrophilic form of vitamin E enhanced the lipogenic activity of the oomycete. The studied compounds, which possess antioxidant activity, did not exert any noticeable effect on the content of eicosapolyenoic acids and the degree of the unsaturation of fungal lipids. 相似文献
10.
A. N. Tsyupko L. B. Dudnik R. P. Evstigneeva A. V. Alessenko 《Biochemistry. Biokhimii?a》2001,66(9):1028-1034
Like the phosphatidyl inositol cycle, the sphingomyelin cycle produces a series of the secondary messengers transmitting extracellular signals from the cytoplasmic membrane into the nucleus. Sphingomyelin, ceramide, sphingosine, sphingomyelinase, and ceramidase are the main components of the sphingomyelin cycle. In spite of numerous data on the functional properties of sphingomyelin cycle products, the activation mechanism for the key enzyme of the sphingomyelin cycle, sphingomyelinase (SMase), is not well understood. We have discovered effects of both reduced (GSH) and oxidized (GSSG) glutathione on the activity of neutral SMase in animals. GSH administration (18 mg per mouse) inhibits this enzymatic activity in liver for 2 h and increases the sphingomyelin level exactly as occurs in cell culture. The levels of diene conjugates and ketodienes decrease simultaneously during the experiment, thus indicating the ability of GSH to suppress oxidative processes in the cell. GSSG administration (18 mg per mouse) has no effect on the SMase activity during the first 15 min, but increases it twofold after 1 h. A short-term decrease in this activity after 30 min may depend on the conversion of excess GSSG into its reduced form by glutathione reductase. Unlike GSH, GSSG has no effect on the level of ketodienes after 1 h, but it induces the accumulation of diene conjugates. A strong correlation exists between the changes in SMase activity and in the level of oxidation products caused by either GSH or GSSG. These data indicate a relationship between SMase activity and the level of peroxidation products and possibly a relation between two signaling systems: the sphingomyelin cycle and the oxidative system. 相似文献