排序方式： 共有112条查询结果，搜索用时 15 毫秒
51.
王福民 《渭南师范学院学报》2003,18(5):28-31
桥联配合物是从化学键的角度通过桥配体结合起来的化合物．多核配合物是从原子数目上讲含有多个金属原子的化合物，从概念上讲二者略有不同，不能将他们混为一谈．文章讨论了二者的联系与区别，提出了桥联配合物的定义、命名，并研究了主族元素桥联配合物的结构与功能和在周期表中形成的倾向性。 相似文献
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基于瓜环-磷光体-重原子微扰剂形成三元包络物,在亚硫酸钠除氧条件下诱导产生咖啡因室温磷光做了研究.并且针对体系的影响因素:重原子、Q[6]、亚硫酸钠用量、放置时间长短和最佳pH范围等做了较详细的研究.此外还对体系的分析性能做了测试,初步建立了检测咖啡因的室温磷光分析方法. 相似文献
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根据不同金属的电子结构特点,分别讨论了其形成配合物时稳定性特征,归结出了一般性规律,同时对一些金属形成配合物时出现的反常现象也作出了一些解释. 相似文献
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运动性疲劳状态下大鼠骨骼肌线粒体呼吸链还原酶活性的研究 总被引：3，自引：0，他引：3
目的:研究运动性疲劳状态下,大鼠骨骼肌线粒体呼吸链还原酶复合体活性的变化,进一步探讨骨骼肌运动性疲劳发生的可能机制。方法:以健康雄性Wister大鼠为实验对象,随机分为安静对照组、大强度运动组和中等强度运动组,分光光度法测定线粒体呼吸链酶复合体(Ⅰ~Ⅲ)活性。结果:与安静对照组相比,大强度运动组CⅠ和CⅡ的活性显著性升高(P<0.01),分别升高63.56%和66.64%;CⅢ的活性显著性下降(P<0.01),下降32.20%;中等强度运动组CⅠ和CⅡ的活性显著性升高(P<0.01),分别升高254.24%和59.29%;CⅢ的活性显著性下降(P<0.01),下降30.51%。与大强度运动组相比,中等强度运动组CⅠ的活性显著性上升(P<0.01),上升116.58%,CⅡ和CⅢ的活性无显著性差异。结论:无论是大强度运动还是中等强度运动,在疲劳状态下,骨骼肌线粒体呼吸链还原酶活性都发生不同程度的变化。CⅠ和CⅡ活性显著增加可能是由于运动时能量需求量大,机体代谢过程中底物NADH和琥珀酸量增多引起的,而CⅢ活性明显降低可能与电子漏,CoQ自氧化产生自由基,内膜流动性下降等因素有关。中等强度持续运动对CⅠ活性的影响程度比大强度间歇运动更深远,这可能是运动方式不同所致。 相似文献
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Jun Zhao Xin Zhao Lei Chao Wei Zhang Tao You Jie Zhang 《Journal of Zhejiang University. Science. B》2014,15(7):670-680
Pollution discharge disturbs the natural functions of water systems. The environmental microbial community composition and diversity are sensitive key indicators to the impact of water pollutant on the microbial ecology system over time. It is meaningful to develop a way to identify the microbial diversity related to heavy metal effects in evaluating river pollution. Water and sediment samples were collected from eight sections along the Tiaozi River where wastewater and sewage were discharged from Siping City in northeastern China. The main pollutants contents and microbial communities were analyzed. As the primary metal pollutants, zinc (Zn) and arsenic (As) were recorded at the maximum concentrations of 420 and 5.72 μg/L in the water, and 1704 and 1.92 mg/kg in the sediment, respectively. These pollutants posed a threat to the microbial community diversity as only a few species of bacteria and eukaryotes with strong resistance were detected through denaturing gradient gel electrophoresis (DGGE). Acinetobacter johnsonii, Clostridium cellulovorans, and Trichococcus pasteurii were the dominant bacteria in the severely polluted areas. The massive reproduction of Limnodrilus hoffmeisteri almost depleted the dissolved oxygen (DO) and resulted in the decline of the aerobic bacteria. It was noted that the pollution reduced the microbial diversity but the L. hoffmeisteri mass increased as the dominant community, which led to the overconsuming of DO and anaerobic stinking water bodies. Water quality, concentrations of heavy metals, and the spatial distribution of microbial populations have obvious consistencies, which mean that the heavy metals in the river pose a serious stress on the microorganisms. 相似文献
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合成了5-溴水杨醛缩邻氨基酚（H2 Brsaph）、5-溴水杨醛缩2-氨基噻唑（HBrsatz）和5-溴水杨醛缩2-氨甲基吡啶（HBrsapy）三种水杨醛类 Schiff碱,制备了配合物[Zn（Brsaph）（H2 O）2]（1）、[Cu（Brsatz）2]4H2 O（2）和[Cd（Brsapy）2]（3）．利用元素分析、摩尔电导、红外光谱、紫外光谱和荧光光谱进行了表征．荧光分析结果表明这些化合物在350-450 nm 光激发下在450-550 nm 范围都具有荧光,但金属离子对它们的发光行为影响不同．利用 X-射线单晶衍射仪分析了 H2 Brsaph的晶体结构,该晶体属单斜 P21空间群,晶胞参数：α＝4．6517（2）A,b＝19．0710（8）A,c＝6．2382（3）A,β＝90．402（4）°,Z＝2,V＝553．40（5）A3,Dc＝1．753 g/cm3,Mr＝292．13,R1＝0．0225,wR2＝0．0553． 相似文献
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Manish K. Singh Shailendra Dwivedi Suraj S. Yadav Praveen Sharma Sanjay Khattri 《Indian journal of clinical biochemistry : IJCB》2014,29(1):29-37
Arsenic a metalloid and environmental contaminated has been found to be associated with public health problems in the affected areas. It is naturally occurred in groundwater and its accumulation in plant and animals leads to toxicity in several tissues most notably hepatic organ. Arsenic exposures (3 mg/kg body weight/day for 30 days) in mice exhibited increased arsenic and Zn levels in hepatocytes associated with enhanced oxidative stress in hepatocytes while there were no significantly changes were observed in Cu level. An increase in the lipid peroxidation and decrease in the levels of reduced glutathione and activity of superoxide dismutase, catalase, and glutathione peroxidase were observed in arsenic treated mice as compared to controls. Arsenic exposure in mice also caused a significant change in serum biomarkers in the SGOT, SGPT and creatinine as compared to the controls. There were no significant changes in the serum levels of total protein in these mice. Co-administration of arsenic and fruit extract of amla (500 mg/kg body weight/day for 30 days) caused a significant reduction of arsenic transference associated with significantly decreases hepatic arsenic levels and balanced the antioxidant enzyme and levels of serum hepatic enzymes like SGOT and SGPT. The results of the present study clearly demonstrate the antioxidant property of amla that could be responsible for its protective efficacy in arsenic induced hepatic toxicity. 相似文献
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目的:探讨4种低氧训练模式对大鼠力竭运动后心肌线粒体自由基代谢及呼吸链功能的影响。方法:将雄性Wistar大鼠随机均分为5组,即低住低训组(LoLo)、高住高练组(HiHi)、高住低训组(HiLo)、低住高练组(LoHi)及高住高练低训组(HiHiLo)。以当地环境为基点作为常氧环境,采用低压氧舱模拟低氧环境。依实验方案,各组大鼠分别在常氧或/和低氧环境中居住及递增负荷训练5周,每周训练6 d。各组大鼠在最后1次训练后,在常氧环境中恢复3 d,力竭运动后即刻取心肌样本。用差速离心法提取心肌线粒体,分别测定丙二醛含量、超氧化物歧化酶、谷胱甘肽过氧化物酶和过氧化氢酶(catalase,CAT)活性及呼吸链酶复合体I～IV(CI～IV)活性。结果:与LoLo组相比,心肌组织中HiHi组GSH-Px及CAT活性均显著升高,HiLo组CAT活性显著升高,LoHi和HiHiLo组SOD、GSH-Px及CAT活性均显著升高,4种低氧训练模式MDA含量均显著降低。与LoLo组相比,HiHiLo组心肌线粒体SOD活性显著升高,HiHi、HiLo和HiHiLo组MDA含量均显著降低。与LoLo组相比,HiHi组心肌线粒体CIV活性显著升高,HiHiLo组CI、CII和CIV活性均显著提高,HiHi、LoHi及HiHiLo组CIII活性均显著降低。结论:HiHiLo可能是较好的低氧训练模式。 相似文献
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目的：探讨补充辅酶Q10与递增负荷运动训练对力竭运动大鼠肝脏线粒体呼吸链酶活性的影响。方法：Wister雄性大鼠36只,随机分为：对照组（NC）、CoQ10补充组（QC）、训练组（NE）、训练＋CoQ10补充组（QE）;QC组和QE组大鼠每天灌胃CoQ10一次,并进行7周递增负荷跑台运动;实验结束时所有大鼠进行一次力竭性跑台运动即刻处死;分光光度计法测定大鼠肝脏线粒体呼吸链酶复合物活性。结果：（1）QC、NE及QE组CⅠ活性均显著高于NC组（P〈0.01或P〈0.001）,QE组CⅠ活性显著高于NE组（P〈0.05）;（2）NE组、QE组CⅡ活性均明显高于NC组（P〈0.01或P〈0.001）,且QE组高于NE组（P〈0.05）;（3）NE组、QE组CⅢ活性均明显高于NC组（P〈0.001）;NE、QE组无明显差异（P〉0.05）;（4）NE组、QE组CⅥ活性明显均高于NC组（P〈0.001）,NE、QE组无显著性差异（P〉0.05）。结论：（1）递增负荷运动训练及运动训练结合CoQ10补充均可提高大鼠力竭运动后即刻肝脏线粒体呼吸链酶复合物活性,改善线粒体完整功能。（2）递增负荷运动训练与补充CoQ10在改善力竭运动后即刻大鼠肝脏线粒体完整功能方面无协同作用。 相似文献