从堆积时间为80~100 a的铅锌矿渣中分离了6株细菌,通过测定部分16S rRNA基因序列确定了它们的系统发育地位。结果表明有3株细菌属于节杆菌属(Arthrobacter),同A.nicotinovorans和A.histidinolovorans两个种关系密切。另外3株属于壤霉菌...从堆积时间为80~100 a的铅锌矿渣中分离了6株细菌,通过测定部分16S rRNA基因序列确定了它们的系统发育地位。结果表明有3株细菌属于节杆菌属(Arthrobacter),同A.nicotinovorans和A.histidinolovorans两个种关系密切。另外3株属于壤霉菌属(Agromy-ces),同Ag.m ediolanus具有较近的亲缘关系。总体来看,这些菌株都对检测的5种重金属有高的最低抑菌浓度(m in im al inh ib itory concentration,M IC)。节杆菌对Zn、Co的耐受明显高于壤霉菌。此外,这些重金属高抗性菌株也对重金属有较强的吸附能力。在环境中有单一重金属离子的情况下,冻干的节杆菌对Pb的吸附率平均达到了约400mg/g干菌体,对Cd和Zn的吸附也分别达到了近177和80mg/g干菌体,具有进一步开发为重金属吸附剂的潜力。展开更多
[Objective] This study aimed to research the effect of metallothionein on cell cycle, apoptosis rate and subsets distribution of lymphocytes in peripheral blood of dairy cows under heat stress, so as to perfect the re...[Objective] This study aimed to research the effect of metallothionein on cell cycle, apoptosis rate and subsets distribution of lymphocytes in peripheral blood of dairy cows under heat stress, so as to perfect the regulative mechanism re- searches of MT to anti-heat stress. [Method] Twenty lactating Chinese Holstein cows were randomly divided into four groups （A, B, C and D）, and injected with 0, 4.0, 8.0 and 12.0 mg Zn-metallothionein, respectively by intravenous route. Blood sam- ples were collected at 1＂, 16~, 31~, 46~ and 61~ day, and the dynamic changes of cell cycle, apoptosis rate and subsets distribution of lymphocytes were determined. [Result] The apoptosis rate of cells in group B and C was lower than those in group A by 26.63% （P〉0.05） and 24.84% （P〉0.05） respectively. The number of cells in the Gc/G1 phage in trial groups was increased and the number of cells in the S and GJM phages tended to decrease, but there were no significant differences （P〉 0.05）. The number of CD3~ T cell in three trial groups was greater than those in group A by 7.02% （P〉0.05）, 5.45% （P〉0.05） and 3.85% （P〉0.05） respectively, while the number of CD4~ T cell in trial groups was higher than those in control group by 31.04% （P〈0.05）, 35.68% （P〈0.05） and 39.34% （P〈0.05） respectively. The number of CD8＇ T cell and the levels of CD4＊/CD8~ in trial groups were increased observ- ably, but significant difference （P〈0.05） was observed in the levels of CD4~/CD8~ between groups A and C only. It demonstrated that exogenous Zn-metallothionein can decrease apoptosis rate, improve cell cycle and regulate subsets distribution of lymphocytes in dairy cattle in a dose-dependent manner. [Conclusion] This study will provide scientific basis for safe utilization of MT in dairy industry.展开更多
A facet-dependent electrochemiluminescence (ECL) behavior was found for nanostructured ZnO with different dominant exposing planes.The ECL spectrum of nanostructured ZnO was recorded by the emission scan mode with a f...A facet-dependent electrochemiluminescence (ECL) behavior was found for nanostructured ZnO with different dominant exposing planes.The ECL spectrum of nanostructured ZnO was recorded by the emission scan mode with a fluorescence spectrometer and applied to investigate the difference of surface state for different crystal planes.Electronic structure calculations based on density functional theory were used to study the effect of crystal plane on the band structure and density of states.It revealed that the ECL emission was originated primarily from the recombination of electrons from Zn 4s and the hole from O 2p,which could be utilized to study the physical and chemical properties of surface structures of as-prepared nanostructured ZnO.A physical model was suggested to elucidate the differences of ECL spectra.A concept was proposed that the energy released as photons during ECL process of nanocrystalline semiconductor materials will be correlated with the energy level of active sites located at different crystal planes.展开更多
文摘从堆积时间为80~100 a的铅锌矿渣中分离了6株细菌,通过测定部分16S rRNA基因序列确定了它们的系统发育地位。结果表明有3株细菌属于节杆菌属(Arthrobacter),同A.nicotinovorans和A.histidinolovorans两个种关系密切。另外3株属于壤霉菌属(Agromy-ces),同Ag.m ediolanus具有较近的亲缘关系。总体来看,这些菌株都对检测的5种重金属有高的最低抑菌浓度(m in im al inh ib itory concentration,M IC)。节杆菌对Zn、Co的耐受明显高于壤霉菌。此外,这些重金属高抗性菌株也对重金属有较强的吸附能力。在环境中有单一重金属离子的情况下,冻干的节杆菌对Pb的吸附率平均达到了约400mg/g干菌体,对Cd和Zn的吸附也分别达到了近177和80mg/g干菌体,具有进一步开发为重金属吸附剂的潜力。
基金Supported by grants from the National Science Foundation of China(31072053,30671516)Natural Science Foundation of Hunan Province,China(11JJ2014)Specialized Research Fund for the Doctoral Program of Higher Education,Ministry of Education,China(20104320110001)
文摘[Objective] This study aimed to research the effect of metallothionein on cell cycle, apoptosis rate and subsets distribution of lymphocytes in peripheral blood of dairy cows under heat stress, so as to perfect the regulative mechanism re- searches of MT to anti-heat stress. [Method] Twenty lactating Chinese Holstein cows were randomly divided into four groups （A, B, C and D）, and injected with 0, 4.0, 8.0 and 12.0 mg Zn-metallothionein, respectively by intravenous route. Blood sam- ples were collected at 1＂, 16~, 31~, 46~ and 61~ day, and the dynamic changes of cell cycle, apoptosis rate and subsets distribution of lymphocytes were determined. [Result] The apoptosis rate of cells in group B and C was lower than those in group A by 26.63% （P〉0.05） and 24.84% （P〉0.05） respectively. The number of cells in the Gc/G1 phage in trial groups was increased and the number of cells in the S and GJM phages tended to decrease, but there were no significant differences （P〉 0.05）. The number of CD3~ T cell in three trial groups was greater than those in group A by 7.02% （P〉0.05）, 5.45% （P〉0.05） and 3.85% （P〉0.05） respectively, while the number of CD4~ T cell in trial groups was higher than those in control group by 31.04% （P〈0.05）, 35.68% （P〈0.05） and 39.34% （P〈0.05） respectively. The number of CD8＇ T cell and the levels of CD4＊/CD8~ in trial groups were increased observ- ably, but significant difference （P〈0.05） was observed in the levels of CD4~/CD8~ between groups A and C only. It demonstrated that exogenous Zn-metallothionein can decrease apoptosis rate, improve cell cycle and regulate subsets distribution of lymphocytes in dairy cattle in a dose-dependent manner. [Conclusion] This study will provide scientific basis for safe utilization of MT in dairy industry.
基金supported by the National Natural Science Foundation of China (21075058,21005036,21127006)Startup Research Fund of Ministry of Education of China,Higher Educational Science and Technology Program of Shandong (J10LB12)+1 种基金Natural Science Foundation(ZR2010BZ004,JQ201106)Tai-Shan Scholar Research Fund of Shandong Province
文摘A facet-dependent electrochemiluminescence (ECL) behavior was found for nanostructured ZnO with different dominant exposing planes.The ECL spectrum of nanostructured ZnO was recorded by the emission scan mode with a fluorescence spectrometer and applied to investigate the difference of surface state for different crystal planes.Electronic structure calculations based on density functional theory were used to study the effect of crystal plane on the band structure and density of states.It revealed that the ECL emission was originated primarily from the recombination of electrons from Zn 4s and the hole from O 2p,which could be utilized to study the physical and chemical properties of surface structures of as-prepared nanostructured ZnO.A physical model was suggested to elucidate the differences of ECL spectra.A concept was proposed that the energy released as photons during ECL process of nanocrystalline semiconductor materials will be correlated with the energy level of active sites located at different crystal planes.
