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排序方式: 共有103条查询结果,搜索用时 15 毫秒
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Prabha Modi Professor B. Sadasivudu U. Lakshminarayana C. R. K. Murthy 《Neurochemical research》1994,19(3):353-358
The functional significance of ammonia production in brain under physiological or pathological conditions is not clearly known. NH4
+ stimulates Na+, K+ activated ATPase causing stabilization of neuronal membranes of which gangliosides are major structural components. Moreover ammonia is known to inhibit lysosomal enzymes which include enzymes degrading gangliosides. Gangliosides have been shown to stimulate neuritogenesis in neuronal cultures and prevent the damage of the neurons from glutamate toxicity particularly in areas of brain ischemia. Hyperammonemia without any behavioural changes was induced in experimental rats by intraperitoneal administration of either a single dose (0.8 mmol/100 g wt.) or by six hourly doses (0.6 mmol/100 g wt.) of ammonium acetate. An increase in the content of gangliosides along with a rise in the content of GD1A and GD1B without any change in -galactosidase and N-acetylhexosaminidase was observed in cerebral cortex, cerebellum, and brain stem, following the administration of single dose of ammonium acetate. Gangliosides, after extraction from the different brain regions, were estimated by the thiobarbituric acid method and expressed in terms of sialic acid. Individual gangliosides were separated and estimated by thin layer chromatography using resorcinol as the staining agent. These results suggest that ammonia production in the neuronal pathways in brain either as a result of repeated stimulation under physiological conditions or as a result of focal ischemia or injury, may likewise cause an increase in the content of gangliosides which may help in neuritic growth (physiological conditions facilitating synaptic plasticity) and may exert a protective effect on the neurons in the ischemic area against glutamate toxicity.Former Professor of Biochemistry, OMC, Hyderabad. 相似文献
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Thirty-seven soil isolates and mutants ofAzotobacter chroococcum tested for poly-3-hydroxybutyrate (PHB) production using Sudan black B staining method were found to be positive. One mutant
showed a higher number of PHB-producing cells and maximum number of granules per cell. Using 2% glucose and 15 mmol/L ammonium
acetate, PHB production was found to be maximum at 36 and 48 h of growth under submerged cultivation and under stationary
cultivation, respectively. PHB production was found to be higher on sucrose and commercial sugar (as carbon sources) as compared
to glucose and mannitol. As commercial sugar is cheaper than sucrose it was selected as carbon source for PHB production,
that being found to be maximum at 1% concentration. Inorganic nitrogen sources seemed to have no stimulatory effect on the
production of PHB. However, ammonium acetate (15 mmol/L) was found to be best for PHB production. Peptone (0.2 %) gave a better
yield of PHB under both growth conditions. Using all optimized conditions, PHB production was studied in ten selected strains.
Two of them were found to be best PHB producers under both growth conditions, one producing 621 and 740 μg/g dry mass under
submerged cultivation and under stationary cultivation, respectively, while the second one produced 589 and 733 μg/g. 相似文献
5.
Seventeen cultures belonging to three genera of facultative bacteria ( Serratia, Cellulomonas, and Corynebacterium) were screened for the production of xylitol, a sugar alcohol used as a sweetener in the pharmaceutical and food industries. The bacterial strains that utilized D-xylose for growth were investigated for xylitol production. A chromogenic assay of both solid and liquid cultures showed that ten of the 17 bacteria screened could grow on D-xylose and produce detectable quantities of xylitol during 24-96 h of fermentation. Among the screened cultures, Corynebacterium sp. B-4247 produced the highest amount of xylitol. In addition, the ten bacterial cultures that initially produced xylitol were studied for the effect of the environmental factors, such as temperature, concentration of D-xylose and aeration, on xylitol production. 相似文献
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Ahn YM Vogeti L Liu CJ Santhapuram HK White JM Vasandani V Mitscher LA Lushington GH Hanson PR Powell DR Himes RH Roby KF Ye Q Georg GI 《Bioorganic & medicinal chemistry》2007,15(2):702-713
The design and synthesis of a small library of 8-amidoflavone, 8-sulfonamidoflavone, 8-amido-7-hydroxyflavone, and heterocyclic analogues of flavopiridol is reported. The potential activity of these compounds as kinase inhibitors was evaluated by cytotoxicity studies in MCF-7 and ID-8 cancer cell lines and inhibition of CDK2-Cyclin A enzyme activity in vitro. The antiproliferative and CDK2-Cyclin A inhibitory activity of these analogues was significantly lower than the activity of flavopiridol. Molecular docking simulations were carried out and these studies suggested a different binding orientation inside the CDK2 binding pocket for these analogues compared to flavopiridol. 相似文献
8.
Qing-Yin Wang Hongping Dong Bin Zou Ratna Karuna Kah Fei Wan Jing Zou Agatha Susila Andy Yip Chao Shan Kim Long Yeo Haoying Xu Mei Ding Wai Ling Chan Feng Gu Peck Gee Seah Wei Liu Suresh B. Lakshminarayana CongBao Kang Julien Lescar Francesca Blasco Paul W. Smith Pei-Yong Shi 《Journal of virology》2015,89(16):8233-8244
9.
Sheshshayee MS Bindumadhava H Ramesh R Prasad TG Lakshminarayana MR Udayakumar M 《Journal of experimental botany》2005,56(422):3033-3039
Experimental evidence is presented to show that the 18O enrichment in the leaf biomass and the mean (time-averaged) transpiration rate are positively correlated in groundnut and rice genotypes. The relationship between oxygen isotope enrichment and stomatal conductance (g(s)) was determined by altering g(s) through ABA and subsequently using contrasting genotypes of cowpea and groundnut. The Peclet model for the 18O enrichment of leaf water relative to the source water is able to predict the mean observed values well, while it cannot reproduce the full range of measured isotopic values. Further, it fails to explain the observed positive correlation between transpiration rate and 18O enrichment in leaf biomass. Transpiration rate is influenced by the prevailing environmental conditions besides the intrinsic genetic variability. As all the genotypes of both species experienced similar environmental conditions, the differences in transpiration rate could mostly be dependent on intrinsic g(s). Therefore, it appears that the delta18O of leaf biomass can be used as an effective surrogate for mean transpiration rate. Further, at a given vapour pressure difference, delta18O can serve as a measure of stomatal conductance as well. 相似文献
10.
Characterization of Cfa1, a monofunctional acyl carrier protein involved in the biosynthesis of the phytotoxin coronatine
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Cfa1 was overproduced in Escherichia coli and Pseudomonas syringae, and the degree of 4'-phosphopantetheinylation was determined. The malonyl-coenzyme A:acyl carrier protein transacylase (FabD) of P. syringae was overproduced and shown to catalyze malonylation of Cfa1, suggesting that FabD plays a role in coronatine biosynthesis. Highly purified Cfa1 did not exhibit self-malonylation activity. 相似文献