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报道用一步酸化法制得四种未见报道的1:10系列镧系钼钒杂多配合物K7H8LnMo4V6P36.xH2O(Ln=La,Ce,Pr,Nd)。提示元素分析,红外光谱,紫外光谱,X射线粉末衍射及差热-热重分析结果讨论了它们的结构及性质。 相似文献
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A microcalorimetric technique was used to evaluate the influence of La^3 on Halobacterium halobium R1 growth.By means of LKB-2277 bioactivity monitor,ampoule methos at 37℃,the thermogenic curves of Halobacterium halobium R1 growth were obtained.In order to analyze the results,the maximum power Pm and the growth rate constants k were determined,showing that values of Pm and k are linked to the concentration of La^3 .Addition of low concentration of La^3 can cause a decrease of the maximum heat production and growth rate constant.However,high concentration of La^3 may promote growth of Halobacterium halobium R1,but at much higher concentration of La^3 ,the growth of Halobacterium halobium R1 is inhibited again.For comparison,the shapes of Halobacterium halobium R1 cell were observed by means of transmission electron microscope.According to the thermogenic curves and TEM photos of Halobacterium halobium R1 under different conditions,it is clear that metabolic mechanism of Halobacterium halobium R1 growth is changed with the addition of La^3 . 相似文献
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微量热法研究硒对大肠杆菌生长代谢的作用 总被引:2,自引:0,他引:2
硒 是生物必需的微量元素之一.自从1973年Rotruck报导了第一个硒酶———红细胞谷胱甘肽过氧化物酶[1],硒在生命科学中的研究取得了令人瞩目的进展.继红细胞谷胱甘肽过氧化物酶之后 ,从哺乳动物中还发现硒为多种酶所必需 ;此外 ,在不同的动物组织中一系列含硒蛋白被分离和鉴别.随着分子生物学技术的发展和硒在生物化学中的应用 ,人们对硒的生物化学本质有了更加深刻的认识 ,其中 ,遗传基因硒代半胱氨酸密码子UGA的发现使硒的生物化学研究进入了一个新的阶段.与此同时 ,小分子有机硒化合物Ebselen生物活性的发现… 相似文献
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By using an LKB-2277 Bioactivity Monitor and cycle-flow method, the thermogenic curves of aerobic growth for Bacillus thuringiensis cry Ⅱ strain at 28 ℃ have been obtained. The metabolic thermogenic curves of Bt cry Ⅱ contain two distinct parts: the first part reflects the changes of bacterial growth phase and the second part corresponds to sporulation phase. From these thermogenic curves in the absence or presence of Sm^3 , Dy^3 ions, the thermokinetic parameters such as the growth rate constants k. the interval time τ1, the maximum power PMAX1 and heat-output QLOG for log phase, the maximum power PMAX2 and heat-output QSTAT for stationary phase, the heat-output QSPOR for sporulation phase and total heat effects QT were calculated. Sm^3 and Dy^3 ions have promoting action on the growth of Bt cryⅡ in their lower concentration range, on the other hand, they have inhibitory action on the sporulation of Bt in their higher concentration range, It has also been found that the effects of Sm^3 and Dy^3 ions on Bt during the sporulation phase were far greater than those during the bacterial growth phase. It was concluded that the application of Bt for controlling insecticide could not be affected by the presence of the rare-earth elements in the environmental ecosystem. 相似文献
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报道了用相转移催化法合成仲丁基膦酸双正己酯以及将其水解转化为相应单酯的方法。该法产品纯,收率高,具有工业应用价值。 相似文献
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Pr3+或La3+与克拉红霉素对大肠杆菌的协同作用 总被引:1,自引:0,他引:1
用LKB-2277生物活性检测系统采用停流法于37 ℃测定了克拉红霉素及克拉红霉素分别与Pr(NO3)3和La(NO3)3混合后,对大肠杆菌生长抑制作用的热效应变化.根据热动力学模型进行了定量解析,得到了各体系的克拉红霉素浓度c与大肠杆菌生长速率常数k之间关系式及其半抑制浓度Ic50.
克拉红霉素: k=0.03106-1.273×10-3c Ic50=8.81 μg•mL-1 (0.5~20 μg•mL-1)
克拉红霉素+Pr3+: k=0.02967-1.332×10-3c Ic50=7.38 μg•mL-1 (1~15 μg•mL-1)
克拉红霉素+La3+: k=0.02741-1.194×10-3c Ic50=6.34 μg•mL-1 (1~15 μg•mL-1)
微量热结果不仅表征了克拉红霉素的抗菌活性强于红霉素,Pr3+或La3+与克拉红霉素协同作用也使抗菌活性增强,而且反映了不同药物作用下细菌的生理、生化和代谢过程热动力学特征的变化. 相似文献
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用LKB-2277生物活性检测系统采用停流法于37℃测定了克拉红霉素及克拉红霉素分别与Pr(NO3)3和La(NO3)3混合后,对大肠杆菌生长抑制作用的热效应变化.根据热动力学模型进行了定量解析,得到了各体系的克拉红霉素浓度c与大肠杆菌生长速率常数k之间关系式及其半抑制浓度Ic50.克拉红霉素:k=0.03106-1.273×10-3cIc50=8.81μg·mL-1(0.5~20μg·mL-1)克拉红霉素+Pr3+:k=0.02967-1.332×10-3cIc50=7.38μg·mL-1(1~15μg·mL-1)克拉红霉素+La3+:k=0.02741-1.194×10-3cIc50=6.34μg·mL-1(1~15μg·mL-1)微量热结果不仅表征了克拉红霉素的抗菌活性强于红霉素,Pr3+或La3+与克拉红霉素协同作用也使抗菌活性增强,而且反映了不同药物作用下细菌的生理、生化和代谢过程热动力学特征的变化. 相似文献