排序方式: 共有10条查询结果,搜索用时 421 毫秒
1
1.
用X射线衍射和穆斯堡尔效应对金属间化物Ti(Fe_(1-x)Mn_x)的结构随锰含量的改变而变化进行了系统的研究,结果表明,当x≥0.45时发生了结构相变.对三元系合金的同质异能移数值变化作了一定解释. 相似文献
2.
针对重金属污染指数(HPI)、重金属评估指数(HEI)方法的部分局限性,对重金属污染指数(HPI)进行了改进,形成了改进的地表水重金属污染指数| r-HPI |方法,并分别应用重金属污染指数(HPI)、重金属评估指数(HEI)、改进的重金属污染指数(| r-HPI |)对研究区域连续三年共1 164个地表水样品统计分析... 相似文献
3.
4.
With 200 mmol/L NaCI treatment on barleycultivar "Jian 4" (Hordeum vulgare L. cv. J4) seedlings for6 d, the contents of covalently and noncovalently conjugatedpolyamines (PAs) and activities of H+-ATPase in plasmamembrane (PM) vesicles isolated from the roots decreasedremarkably. Moreover, the activity of Na+/H+ antiport wasdetected first in PM vesicles. The results showed that thedecrease in the contents of membrane phospholipid, nonco-valently conjugated PAs and activity of H+-ATPase caused byNaCl could be restored partially by application of 1 mmol/Lstearic acid (C16:0) and linoleic acid (C18:2), and C18:2 wasmore effective than C16:0. In addition, a reduction in the con-tents of covalently conjugated PAs was only reversed par-tially in the presence of C18:2. Furthermore, Na+/H+ antiportactivity was strengthened by exogenous C16:0 and C18:2, andC18a was more effective than C16:0. The correlative analysissuggested that, after application of C16:0 and C18:2 under saltstress, there was a significant positive correlation existingamong phospholipid content, noncovalently conjugated PAlevels, H+-ATPase activities and Na+/H+ antiport activities,indicating that one of the mitigative mechanisms of exoge-nous fatty acids on salt injury was to improve membranephospholipid and PA contents, leading to an enhance inmembrane integrity and a change in charge status of PMvesicles, so the activity of membrane-associated enzymeH+-ATPase was increased and synthesis of Na+/H+ antiportprotein was activated. 相似文献
5.
大孔膦酸树脂吸附铟的研究 总被引:18,自引:1,他引:17
研究了大孔膦酸型树脂对铟(Ⅲ)的吸附、洗脱条件;不同金属离子对铟吸附的影响;树脂吸附铟的容量及配位比。并用化学分析法及红外光谱探讨了膦酸树脂吸附铟的机理。 相似文献
6.
7.
With 200 mmol/L NaCl treatment on barley cultivar “Jian 4” (Hordeum vulgare L. cv. J4) seedlings for 6 d, the contents of covalently and noncovalently conjugated polyamines (PAs) and activities of
H+-ATPase in plasma membrane (PM) vesicles isolated from the roots decreased remarkably. Moreover, the activity of Na+/H+ antiport was detected first in PM vesicles. The results showed that the decrease in the contents of membrane phospholipid,
noncovalently conjugated PAs and activity of H+-ATPase caused by NaCl could be restored partially by application of 1 mmol/L stearie acid (C16:0) and linoleic acid (C18:2), and C18:2 was more effective than C16:0 In addition, a reduction in the contents of covalently conjugated PAs was only reversed partially in the presence of C18:2 Furthermore, Na+/H+ antiport activity was strengthened by exogenous C16:0 and C18:2 and C18:2 was more effective than C16:0. The correlative analysis suggested that, after application of C16:0 and C18:2 under salt stress, there was a significant positive correlation existing among phospholipid content, noncovalently conjugated
PA levels, H+-ATPase activities and Na+/H+ antiport activities, indicating that one of the mitigative mechanisms of exogenous fatty acids on salt injury was to improve
membrane phospholipid and PA contents, leading to an enhance in membrane integrity and a change in charge status of PM vesicles,
so the activity of membrane-associated enzyme H+-ATPase was increased and synthesis of Na+/H+ antiport protein was activated. 相似文献
8.
9.
10.
1