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排序方式: 共有138条查询结果,搜索用时 171 毫秒
1.
Audesh Bhat Anil Koul Ekta Rai Swarkar Sharma M. K. Dhar R. N. K. Bamezai 《Human genetics》2008,123(1):115
2.
Anabaena torulosa exhibited fructose-dependent growth, heterocyst differentiation and N2 fixation in nitrate-free (diazotrophic) cultures in photoheterotrophic and chemoheterotrophic conditions. The incorporation
of nitrate into such cultures inhibited the formation of heterocysts and N2 fixation. The rate of NO
3
−
uptake byA. torulosa in photoautotrophic, photoheterotrophic and chemoheterotrophic conditions was similar but it increased by 100% in phototrophic
conditions. The activity of glucose-6-phosphate dehydrogenase was found to be maximum in phototrophic and photoheterotrophic
conditions. Ferredoxin-NADP+ reductase, nitrate reductase and glutamate-ammonia ligase activities suggest that nitrate utilization takes place in nonphotosynthetic
conditions. 相似文献
3.
Identification of FtsW and characterization of a new ftsW division mutant of Escherichia coli. 总被引:4,自引:2,他引:2
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The product of the ftsW gene has been identified as a polypeptide that, like the related RodA protein, shows anomalous mobility on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. FtsW is produced at low levels that can be increased by altering the translation initiation region of the mRNA. Overproduction of FtsW strongly inhibits cell growth. A new mutant allele, ftsW201, causes a temperature-dependent block in the initiation stage of cell division which is similar to the division block in ftsZ mutants. The block in initiation of division in the ftsW201 allele is shown to be independent of FtsZ or the FtsZ inhibitor, SulA. In addition, the ftsW201 mutant is hypersensitive to overproduction of the division initiation protein FtsZ at the permissive temperature. Our results suggest a role for FtsW in an early stage of division which may involve an interaction with FtsZ. 相似文献
4.
AbstractCalcium is an important macronutrient for both prokaryotes and eukaryotes. It acts as an important second messenger mediating rapid response to environmental conditions. The present investigation deals with proteome profiling of Anabaena 7120 and its derivative ntcA mutant in response to varied calcium doses (0, 1 and 10?mM CaCl2). Concentration of 1?mM CaCl2 salt was the optimum concentration whereas 10?mM CaCl2 was the inhibitory concentration for both the wild type and mutant strains. The results showed highly significant alteration in terms of protein abundance and differential response related to key processes of photosynthesis, energy and metabolism, nitrogen metabolism, oxidative and antioxidative defence, transport and signalling and fatty acid metabolism. In the wild type proteins related to photosynthesis and nitrogen metabolism showed upregulation at 1?mM CaCl2 concentration while antioxidative defence related proteins were down-regulated. In the mutant however, proteins related to photosynthesis and nitrogen metabolism exhibited severe down-regulation. Some hypothetical proteins were also realized during proteome analysis. Overall, our results suggested that NtcA have a potential role in regulation of calcium ion dependent key processes underlying in various metabolic activities of the cyanobacterium Anabaena 7120. 相似文献
5.
D. P. Singh J. I. S. Khattar Mandeep Kaur Gurdeep Kaur Meenu Gupta Yadvinder Singh 《PloS one》2013,8(1)
This study deals with anilofos tolerance and its mineralization by the common rice field cyanobacterium Synechocystis sp. strain PUPCCC 64. The organism tolerated anilofos up to 25 mg L−1. The herbicide caused inhibitory effects on photosynthetic pigments of the test organism in a dose-dependent manner. The organism exhibited 60, 89, 96, 85 and 79% decrease in chlorophyll a, carotenoids, phycocyanin, allophycocyanin and phycoerythrin, respectively, in 20 mg L−1 anilofos on day six. Activities of superoxide dismutase, catalase and peroxidase increased by 1.04 to 1.80 times over control cultures in presence of 20 mg L−1 anilofos. Glutathione content decreased by 26% while proline content was unaffected by 20 mg L−1 anilofos. The test organism showed intracellular uptake and metabolized the herbicide. Uptake of herbicide by test organism was fast during initial six hours followed by slow uptake until 120 hours. The organism exhibited maximum anilofos removal at 100 mg protein L−1, pH 8.0 and 30°C. Its growth in phosphate deficient basal medium in the presence of anilofos (2.5 mg L−1) indicated that herbicide was used by the strain PUPCCC 64 as a source of phosphate. 相似文献
6.
Yadav Shweta Gupta Ekta Patel Anju Srivastava Suchi Mishra Virendra Kumar Singh Poonam C. Srivastava Pankaj Kumar Barik Saroj Kanta 《Reviews in Environmental Science and Biotechnology》2022,21(3):771-798
Reviews in Environmental Science and Bio/Technology - In the past few decades, pollution from microplastics has emerged as an important issue on a global scale. These plastic particles are mainly... 相似文献
7.
The addition of a nitrogen (nitrate) and carbon sources (acetate, citrate and fructose) and phosphate deficiency (nitrate
medium deficient in phosphate) under unaerated conditions induced akinete differentiation inAnabœna torulosa. Aerated cultures of this organism in these nutrients did not differentiate akinetes. Oxygen evolution by aerated cultures
was higher when compared to unaerated cultures, which concurred with high chlorophyll content of aerated cultures. Nitrate
nitrogen supported high phycocyanin content in unaerated cultures, phycocyanin and allophycocyanin contents were low under
aerated conditions. The contents of phycocyanin, allophycocyanin, phycoerythrin and carotenoids gradually decreased at the
mature akinete phase. Under aerated conditions, chlorophyll content rose and the content of all the pigments increased with
the growth rate of the organism. 相似文献
8.
N. K. Arora Ekta Khare S. Singh D. K. Maheshwari 《World journal of microbiology & biotechnology》2010,26(5):811-816
Most of the legume crops are affected by metal stress present in the soil mainly due to contaminated agrochemicals and sewage
sludge. The effect of aluminium, and heavy metals copper, iron and molybdenum on growth and activity of enzymes of fast and
slow growing rhizobial sps. was studied. Sinorhizobium meliloti RMP5 was found to be more tolerant to metal stress than Bradyrhizobium BMP1. Both the strains were extremely sensitive to Al than other metals. Al was much more deleterious for the enzymatic activities
(nitrate reduction, nitrite reduction, nitrogenase and uptake hydrogenase) of strain RMP5 and BMP1. Cu showed inhibitory effect on growth and enzyme activities of Bradyrhizobium strain at all concentrations. However, in S. meliloti RMP5 all the tested enzymatic activities increased up to the concentration of 0.1 mM Cu. Fe enhanced the growth and enzyme activities
of S. meliloti RMP5 and Bradyrhizobium BMP1 up to 100 mM concentration. Mo enhanced all the tested enzymatic activities of S. meliloti RMP5 up to 1 mM. Nitrate and nitrite reduction activities of Bradyrhizobium BMP1 increased up to 1 mM concentration. However, nitrogenase and hydrogenase activities of Bradyrhizobium BMP1 got enhanced only up to 0.5 mM Mo. Both Fe and Mo are the key components of the enzyme nitrogenase and nitrate reductase
and enhanced the growth and enzyme activities of both the sps. The study of physiology of nitrogen fixing ability of both
fast and slow growing rhizobial strains reported that the supplementation of Mo and Fe in soils along with the biological
formulations will enhance the process of symbiotic nitrogen fixation. 相似文献
9.
The role of mitochondria in causing diseases is becoming evident as more and more studies are focusing on this organelle of
the cell. This is largely attributed to its reactive oxygen species (ROS) production property. In the context of diabetes,
ROS is suggested to trigger different forms of insulin resistance involving different mechanisms. The suggestive role of a
mtDNA variant G10398A in increasing ROS production and the impaired response to oxidative stress due to T16189C variant is
worth addressing as genetic susceptibility factors in type 2 diabetes mellitus (T2DM). A case control study on 312 T2DM cases
and ethnically matched 466 controls involving two North Indian populations, referred as cohort 1 and cohort 2 (in a replicative
study), was undertaken to test such a genetic association. A statistically significant association was observed for 10398A
allele in both the cohorts [cohort1 (OR = 2.67 95% CI 1.77–4.00); cohort2 (OR = 1.76 95%CI 1.12–2.77)]. The analysis of G10398A/T16189C
haplotypic combinations revealed that 10398A/16189C haplotype provides a risk in both the cohorts. To sum up the study suggests
that 10398A and 16189C alleles provide susceptiblity to T2DM independently as well as together. 相似文献
10.