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141.
142.
颈髓损伤后线粒体系列酶活性变化与线粒体功能的关系 总被引:2,自引:0,他引:2
为了探讨颈髓损伤后颈髓线粒体系列酶活性变化与线粒体功能的关系,采用Alen法造成猫颈髓损伤,观察颈髓损伤后线粒体Ca2+,Mg2+-ATP酶、Na+,K+-ATP酶、超氧化物歧化酶(SOD)活性及线粒体呼吸功能的变化。结果显示:颈髓损伤后2h至72h,Ca2+,Mg2+-ATP酶、Na+,K+-ATP酶活性、SOD活性明显降低,而线粒体呼吸控制率(RCR)、磷氧比值(P/O)、氧化磷酸化效率(OPR)也明显下降。表明颈髓损伤后Ca2+,Mg2+-ATP酶、Na+,K+-ATP酶、SOD活性与线粒体功能密切相关,提示颈髓线粒体的病理生理改变在颈髓损伤后继发性损害过程中起重要作用。 相似文献
143.
144.
Fei‐Xue Fu Mark E. Warner Yaohong Zhang Yuanyuan Feng David A. Hutchins 《Journal of phycology》2007,43(3):485-496
Little is known about the combined impacts of future CO2 and temperature increases on the growth and physiology of marine picocyanobacteria. We incubated Synechococcus and Prochlorococcus under present‐day (380 ppm) or predicted year‐2100 CO2 levels (750 ppm), and under normal versus elevated temperatures (+4°C) in semicontinuous cultures. Increased temperature stimulated the cell division rates of Synechococcus but not Prochlorococcus. Doubled CO2 combined with elevated temperature increased maximum chl a–normalized photosynthetic rates of Synechococcus four times relative to controls. Temperature also altered other photosynthetic parameters (α, Φmax, Ek, and ) in Synechococcus, but these changes were not observed for Prochlorococcus. Both increased CO2 and temperature raised the phycobilin and chl a content of Synechococcus, while only elevated temperature increased divinyl chl a in Prochlorococcus. Cellular carbon (C) and nitrogen (N) quotas, but not phosphorus (P) quotas, increased with elevated CO2 in Synechococcus, leading to ~20% higher C:P and N:P ratios. In contrast, Prochlorococcus elemental composition remained unaffected by CO2, but cell volume and elemental quotas doubled with increasing temperature while maintaining constant stoichiometry. Synechococcus showed a much greater response to CO2 and temperature increases for most parameters measured, compared with Prochlorococcus. Our results suggest that global change could influence the dominance of Synechococcus and Prochlorococcus ecotypes, with likely effects on oligotrophic food‐web structure. However, individual picocyanobacteria strains may respond quite differently to future CO2 and temperature increases, and caution is needed when generalizing their responses to global change in the ocean. 相似文献
145.
Zhang W Yue B Wang X Zhang X Xie Z Liu N Fu W Yuan Y Chen D Fu D Zhao B Yin Y Yan X Wang X Zhang R Liu J Li M Tang Y Hou R Zhang Z 《Molecular biology reports》2011,38(7):4257-4264
In order to investigate the mitochondrial genome of Panthera tigris amoyensis, two South China tigers (P25 and P27) were analyzed following 15 cymt-specific primer sets. The entire mtDNA sequence was found to be 16,957 bp and 17,001 bp long for P25 and P27 respectively, and this difference in length between P25 and P27 occurred in the number of tandem repeats in the RS-3 segment of the control region. The structural characteristics of complete P. t. amoyensis mitochondrial genomes were also highly similar to those of P. uncia. Additionally, the rate of point mutation was only 0.3% and a total of 59 variable sites between P25 and P27 were found. Out of the 59 variable sites, 6 were located in 6 different tRNA genes, 6 in the 2 rRNA genes, 7 in non-coding regions (one located between tRNA-Asn and tRNA-Tyr and six in the D-loop), and 40 in 10 protein-coding genes. COI held the largest amount of variable sites (9 sites) and Cytb contained the highest variable rate (0.7%) in the complete sequences. Moreover, out of the 40 variable sites located in 10 protein-coding genes, 12 sites were nonsynonymous. 相似文献
146.
Luo N Wang X Chung BH Lee MH Klein RL Garvey WT Fu Y 《American journal of physiology. Endocrinology and metabolism》2011,301(1):E180-E186
Epidemiological studies have associated low circulating levels of the adipokine adiponectin with multiple metabolic disorders, including metabolic syndrome, obesity, insulin resistance, type II diabetes, and cardiovascular disease. Recently, we reported that adiponectin selectively overexpressed in mouse macrophages can improve insulin sensitivity and protect against inflammation and atherosclerosis. To further investigate the role of adiponectin and macrophages on lipid and lipometabolism in vivo, we engineered the expression of adiponectin in mouse macrophages (Ad-TG mice) and examined effects on plasma lipoproteins and on the expression levels of genes involved in lipoprotein metabolism in tissues. Compared with the wild-type (WT) mice, Ad-TG mice exhibited significantly lower levels of plasma total cholesterol (-21%, P < 0.05) due to significantly decreased LDL (-34%, P < 0.05) and VLDL (-32%, P < 0.05) cholesterol concentrations together with a significant increase in HDL cholesterol (+41%, P < 0.05). Further studies investigating potential mechanisms responsible for the change in lipoprotein cholesterol profile revealed that adiponectin-producing macrophages altered expression of key genes in liver tissue, including apoA1, apoB, apoE, the LDL receptor, (P < 0.05), and ATP-binding cassette G1 (P < 0.01). In addition, Ad-TG mice also exhibited higher total and high-molecular-weight adipnection levels in plasma and increased expression of the anti-inflammatory cytokine IL-10 as well as a decrease in the proinflammatory cytokine IL-6 in adipose tissue. These results indicate that macrophages engineered to produce adiponectin can influence in vivo gene expression in adipose tissue in a manner that reduces inflammation and macrophage infiltration and in liver tissue in a manner that alters the circulating lipoprotein profile, resulting in a decrease in VLDL and LDL and an increase in HDL cholesterol. The data support further study addressing the use of genetically manipulated macrophages as a novel therapeutic approach for treatment of cardiometabolic disease. 相似文献
147.
花生种子高纯度DNA的提取(简报) 总被引:2,自引:0,他引:2
花生种子高纯度DNA的提取(简报)王艳,何军贤,傅家瑞(中山大学生命科学学院,广州50275)关键词花生;种子;DNA;十六烷基三甲基溴化铵RAPIDANDEFFICIENTPURIFICATIONOFDNAFROMPEANUT(ARACHISHYP... 相似文献
148.
人骨保护素(OPG)重组腺病毒的制备及其生物活性研究 总被引:1,自引:0,他引:1
采用RT-PCR法得到人OPG的编码区cDNA,克隆至穿梭质粒pShuttle,构建重组有OPG编码区cDNA的腺病毒DNA,经Pac I 酶切线性化,在脂质体介导下转染HEK293细胞,制备重组腺病毒并测定病毒滴度约为5×106~1.5×107 pfu/mL。体外感染小鼠成肌细胞C2C12,Western blot及ELISA检测证实有OPG蛋白的表达,并可在细胞培养上清中持续表达6周。感染OPG重组腺病毒的C2C12细胞生长状态良好、细胞周期无明显变化。将重组腺病毒加入体外培养的小鼠骨髓细胞的培养基中,诱导形成的破骨细胞数量及在象牙片上形成的吸收陷窝的数量显著减少(P<0.01)。
相似文献
149.
热球菌目(Thermococcales)是一类分离自浅海热泉或者深海热液口的超嗜热微生物,包括火球菌(Pyrococcus)、热球菌(Thermococcus)、古老球菌(Palaeococcus)。研究其生命活动的分子机制,基因的功能等必须借助遗传操作系统。由于选择标记的限制,Thermococcales遗传操作系统落后于其他菌株。近年来,在Thermococcales发现了内源质粒并可以将其改造用作遗传工具。如在Thermococcus kodakarensis及Pyrococcus furious等菌株内都建立了成熟的遗传系统,并用于基因敲除以及基因表达。将就Thermococcales内源质粒的发现和遗传操作系统的发展与应用加以阐述。 相似文献
150.
Identification of pathogens in culture-negative infective endocarditis cases by metagenomic analysis
Jun Cheng Huan Hu Yue Kang Weizhi Chen Wei Fang Kaijuan Wang Qian Zhang Aisi Fu Shuilian Zhou Chen Cheng Qingqing Cao Feiyan Wang Shela Lee Zhou Zhou 《Annals of clinical microbiology and antimicrobials》2018,17(1):43