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991.
992.
介绍用交流示波极谱滴定法测混合氨基酸的含量。在KCl底液中,利用HCHO将-NH2封闭,用KOH标准液滴定,HCHO同时做指示剂,以极谱图形的敏锐变化指示终点的到过,测定结果准确。 相似文献
993.
994.
995.
Tian XY Zhang Q Zhao R Setterberg RB Zeng QQ Ma YF Jee W SS 《Journal of musculoskeletal & neuronal interactions》2007,7(4):372-381
It is well documented that intermittent PGE(2) treatment increases both trabecular and cortical bone mass. However, the effects of continuous PGE(2) administration remain undocumented. The aim of the study was to investigate the effects of continuous prostaglandin E(2) (PGE(2)) on different bone sites in skeletally mature rats. Six-month-old Sprague Dawley rats were treated with PGE(2) at 1 or 3 mg/kg/d continuously via infusion pump for 21 days. Two other groups of rats received PGE(2) at the same doses by intermittent (daily) subcutaneous injections and served as positive controls. Histomorphometry was performed on cancellous bone of the proximal tibial metaphysis and cortical bone of the tibial shaft. As expected, intermittent PGE(2) treatment increased both cancellous and cortical bone mass by stimulating bone formation at the cancellous, periosteal and endocortical bone surfaces. In contrast, continuous PGE(2) treatment decreased cancellous bone mass with bone resorption exceeding bone formation. In addition, continuous PGE(2) treatment increased endocortical and intracortical bone remodeling, inducing bone loss which was partially offset by stimulating periosteal expansion. We conclude that continuous PGE(2) treatment induces overall catabolic effects on both cancellous and cortical bone envelopes, which differs from intermittent PGE(2) treatment that is anabolic. Lastly, we speculate that superior bone mass may be achieved by co-treatment of continuous PGE(2) in combination with an anti-catabolic agent. 相似文献
996.
997.
The Diversity and Anti-Microbial Activity of Endophytic Actinomycetes Isolated from Medicinal Plants in Panxi Plateau,China 总被引:1,自引:0,他引:1
Ke Zhao Petri Penttinen Tongwei Guan Jing Xiao Qiang Chen Jun Xu Kristina Lindström Lili Zhang Xiaoping Zhang Gary A. Strobel 《Current microbiology》2011,62(1):182-190
Traditional Chinese medicinal plants are sources of biologically active compounds, providing raw material for pharmaceutical,
cosmetic and fragrance industries. The endophytes of medicinal plants participate in biochemical pathways and produce analogous
or novel bioactive compounds. Panxi plateau in South-west Sichuan in China with its unique geographical and climatological
characteristics is a habitat of a great variety of medicinal plants. In this study, 560 endophytic actinomycetes were isolated
from 26 medicinal plant species in Panxi plateau. 60 isolates were selected for 16S rDNA-RFLP analysis and 14 representative
strains were chosen for 16S rDNA sequencing. According to the phylogenetic analysis, seven isolates were Streptomyces sp., while the remainder belonged to genera Micromonospora, Oerskovia, Nonomuraea, Promicromonospora and Rhodococcus. Antimicrobial activity analysis combined with the results of amplifying genes coding for polyketide synthetase (PKS-I, PKS-II)
and nonribosomal peptide synthetase (NRPS) showed that endophytic actinomycetes isolated from medicinal plants in Panxi plateau
had broad-spectrum antimicrobial activity and potential natural product diversity, which further proved that endophytic actinomycetes
are valuable reservoirs of novel bioactive compounds. 相似文献
998.
叶片阶段性白化小麦的叶绿体激发能分配和荧光动力学特征 总被引:1,自引:1,他引:1
叶片阶段性白化小麦是一种非常特殊的色素突变体。本文对其白色、白绿相嵌及转绿叶片的叶绿体光化活性分别进行了测定。试验表明:(1)白化和白绿相嵌叶片的叶绿体色素合成处于停滞阶段,转绿叶片则处于色素迅速合成阶段;(2)白化、白绿相嵌和转绿叶片叶绿体的激发能传递呈递增趋势;(3)三者对绿体的PSⅡ活性和原初光能转化效率也呈递增趋势;(4)白化叶片叶绿体缺乏PSⅠ和PSⅡ外周天线色素蛋白,白绿相嵌和转绿叶片的类囊体膜多肽组分与正常叶片相近似。 相似文献
999.
Feiyu Jia Chongxi Liu Xiangjing Wang Junwei Zhao Qianfeng Liu Ji Zhang Ruixia Gao Wensheng Xiang 《Antonie van Leeuwenhoek》2013,103(2):399-408
A novel endophytic actinomycete, designated strain NEAU-J3T, was isolated from soybean root (Glycine max (L.) Merr) and characterized using a polyphasic approach. Phylogenetic analysis based on 16S rRNA gene sequences suggested that strain NEAU-J3T fell within the family Micromonosporaceae. The strain was observed to form an extensively branched substrate mycelium, which carried non-motile oval spores with a smooth surface. The cell walls of strain NEAU-J3T were determined to contain meso-diaminopimelic acid and galactose, ribose and glucose were detected as whole-cell sugars. The major menaquinones were determined to be MK-9(H4) and MK-9(H6). The phospholipids detected were phosphatidylcholine and phosphatidylethanolamine. The major cellular fatty acids were determined to be C16:0, C18:1 ω9c, C18:0, C17:0, C17:1 ω7c, anteiso-C17:0, C16:1 ω7c and C15:0. The DNA G + C content was 62.5 mol%. On the basis of the morphological and chemotaxonomic characteristics, phylogenetic analysis and characteristic patterns of 16S rRNA gene signature nucleotides, strain NEAU-J3T is considered to represent a novel species of a new genus within the family Micromonosporaceae, for which the name Wangella harbinensis gen. nov., sp. nov. is proposed. The type strain of Wangella harbinensis is strain NEAU-J3T (=CGMCC 4.7039T = DSM 45747T). 相似文献
1000.
Pengshan Zhao Fei Liu Bing Wang Guanzhong Yu Pengfei Jia Heng Liu 《Acta Physiologiae Plantarum》2013,35(5):1625-1632
The soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) play essential roles in intracellular trafficking. However, few experimental data have clarified their roles in the stress responses and the early secretary pathway in Arabidopsis. The AtSec20 gene encodes a protein that is homologous to yeast Sec20p and mammalian BNIP1, which are involved in the Golgi-to-ER retrograde trafficking in yeast and mammalian cells. In this study, AtSec20 is found to be required for the responses to salt stress, osmotic stress and gibberellin (GA) during seed germination and early seedling establishment. Mutation of AtSec20 unaffects the morphology of intracellular organelles, such as endoplasmic reticulum (ER), trans-Golgi network, and peroxisome, and vacuolar protein trafficking is normal in sec20 mutants. Collectively, these results imply that the AtSec20 is involved in abiotic stress tolerance, potentially via roles in retrograde vesicle fusion process in Arabidopsis. 相似文献