草酸

Rather pure samples of nickel oxalates, with n value equal to 0.5, 1.0 1.5, 2.0 individually, were synthesized and furthermore, their molecular formula, XRD pattern and data were determined.

其中，n值为0时，即为α-NiC_2O_4·2H_2O，其余均为JCPDS尚无卡片的含NH_3草酸镍新化合物，对n值为0.5，1.0，1.5，2.0的4种，已制备出较纯的样品，确定其分子式及XRD图谱与数据。

The results indicated that the accumulation of Mn in the cell wall (accumulation rate as high as 36.34%) and the vacuole of the leaves (accumulation rate as high as 65.64%) might be one of the mechanisms of tolerance and hyperaccumulation of Polygonum hydropiper to Mn. Most Mn in leaves were the speciation of H2O-solubility organic salts or manganese oxalates. The content of chlorophyll a did not change under different Mn concentration treatments except that its content decreased remarkably when Mn concentration was 8000μmol/L in solutions. The membranes were not banned by Mn when its concentration was less than 5000μmol/L in solutions; Under different Mn concentrations of Mn, the content of their soluble proteins of leaves had changed at some stage. The activity of SOD and POD were gradually improved with the increasing of Mn concentration, which could eliminate activated oxygen free radical, This might be the other physiological mechanism of tolerance and hyperaccumulation of Polygonum hydropiper responding to Mn.

结果表明：锰在水蓼叶片非活性代谢部分的积累是其解毒耐锰的主要机制之一；水蓼叶片中的锰大部分以水溶性有机盐或草酸锰的形态存在；在锰浓度处理为8000μmol/L时，叶绿素a含量显著降低，而在其它处理条件下，叶绿素a无明显变化；在锰处理≤5000μmol/L时水蓼叶片的细胞膜还没有受到明显伤害；水蓼叶片的可溶性蛋白含量随锰处理浓度不同而变化，说明植物在代谢和结构上发生了调整；随锰处理浓度的增加，水蓼叶片SOD和POD活性提高，保护酶活性的提高又可清除活性氧自由基，这是水蓼耐高锰和累积锰的一种生理响应机制。

It was found out that under alkali condition in the Ni~(2+)-NH_3-C_2O_4~(2-)-H_2O system, Ni(NH_3)_(1.5)C_2O_4·2H_2O is the most stable phase of nickel oxalates in the experimental range of conditions,generally existing as the only species of nickel oxalates in the systems aged fully.

研究发现，在Ni~(2+)-NH_3-C_2O_4~(2-)-H_2O体系碱性条件下，实验研究的范围内，NiN(来源：1fABC论75文网www.abclunwen.comH_3_(1.5)C_2O_4·2H_2O是稳定性最高的物相，充分陈化后，往往是体系中唯一存在的草酸镍化合物。

Some technologies,including olefines from methanol,oxalates and ethylene glycol from carbon monoxide,carbon dioxide-based polymers,chemicals from the syngas prepared by biomass gasification,acetone and butanol by fermentation,and chemicals from acetylene,ethanol,glycerol,furfural,hydroxymethyl furfural and starch,were reviewed.

包括甲醇制烯烃，一氧化碳制草酸酯和乙二醇，乙炔化学品，二氧化碳聚合物，生物质气化合成化工产品，发酵法生产丙酮、丁醇，乙醇衍生化工产品，甘油合成化工产品，糠醛和羟甲基糠醛合成化工产品，淀粉合成化工产品等重要的石油替代化学品生产技术被介绍。

Solution of iodine reaction showed purple-brown, reddish violet.

结果 性状主要特征为有时具姜样气味；显微主要特征为多糖类团块、厚壁细胞、薄壁细胞、草酸钙针晶束及姜的淀粉粒、梯纹导管、纤维、油细胞等；碘试液反应呈紫棕、红紫色。

The formation of tin dioxide nanotubes on tin substrates anodizing in oxalic acid electrolytes and annealing in the air was investigated. Under optimized electrolyte, oxidation and anneal conditions, nanotubes of tin dioxide were fabricated.

单质锡箔片在草酸溶液中利用电化学阳极氧化合成出前聚体，并将前聚体通过加热氧化制备出具有纳米级孔道的二氧化锡材料。

Nano-SnO powders were prepared by sol-gel technique using tin dichloride, oxalic acid and dehydrated alcohol as raw materials, and characterized by thermogravimertric analysis and differential thermal analysis, X-ray diffraction, transmission electron microscope, scanning electron microscopy in combination with various electrochemical methods.

以氯化亚锡、草酸和无水乙醇为原料，采用溶胶－凝胶法制备了纳米SnO粉末，并用热重－差热分析、X-射线衍射分析、透射电镜和扫描电镜等多种电化学方法对其进行了表征。

The content of the three samples-acetic acid ,oxalic acid and citric acid was determined by second- time derivative.

利用二级微商法对醋酸、草酸、柠檬酸等3种样品含量进行了测定，对此分析结果表明，该方法是一种理想的、快速简便的、准确度高的电位滴定方法

Pelvic radiotherapy was delivered with a three-field technique to a total dose of 46 Gy over 4.5 weeks.

在放疗第1周和第4周同步给予2个周期化疗，草酸铂130mg／m^2第1天，5。

Oxalate is rich in certain plant foods like spinach, strawberry, chocolate, wheat bran and nuts.

草酸丰富，在某些植物性食物如菠菜，草莓，巧克力，小麦麸皮和坚果。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。