聚乙烯醇

It is necessary to develop a protein-free media for oocytes maturation that can prevent zona hardening. In this study, immature macaque oocytes were cultured in modified CMRL media alone or CMRL with either bovine calf serum or PVA for 24 hours. Also, in vivo matured oocytes were cultured in CMRL supplemented with PVA or serum for approximately 6 hours.

我们在本研究中，将非成熟的猕猴卵母细胞分别在改良的CMRL，或在含有胎牛血清或聚乙烯醇的改良CMRL培养基中培养24小时；同时，将体内成熟的卵母细胞分别在含有PVA或者胎牛血清的CMRL中培养6小时，然后进行体外授精，比较各组间精子穿透率或受精，以及胚胎发育情况。

A ion association complex (maximum absorbance at 550 nm) was formed after the reaction of I-3 and crystal violet to determine DO in water.

连云港金兆水务有限公司，江苏连云港 222005〖摘要〗在碘量法测定水中溶解氧的基础上，利用 I-3与结晶紫在聚乙烯醇存在下结合成电中性的离子缔合物，以碘酸钾为标准溶液，与过量碘化钾反应生成碘，加入结晶紫后在550 nm 处有最大吸收的原理测定水中溶解氧，优化了试验条件，考察了共存离子的干扰。

In this paper the synthetic technology for producing low toxic environmental protection type urea-formaldehyde resin adhesive was studied.

通过对低毒环保型脲醛树脂胶粘剂的合成工艺进行研究，得出的结论为按工艺条件，一次性加入甲醛后，用NaOH或NH_4Cl调节pH值、用聚乙烯醇作改性剂，在适当的温度下分批加入尿素，进行阶段反应，从而获得一种乳白色的胶粘剂。

PVA was used as the basic carrier, and alginate sodium and silicon dioxide were added selectively to prepare complex carrier of immobilized yeast and then it was applied in liquor production by liquid fermentation.

以聚乙烯醇为基本载体，选择性地加入海藻酸钠、二氧化硅，制备成固定化酵母细胞的复合载体在液态法生产白酒中应用。

The very good method to analyze the structural change of reaction process of polyvinyl alcohol modified UF resin by the traditional process alkali-acid-alkali is 13C-NMR,and which extrapolate a possibly reaction.

通过13C-NMR解析了采用传统工艺合成聚乙烯醇改性脲醛树脂反应过程中的结构变化，并推测其反应。

Experiment finds that melamine formaldehyde resin could reduce the ramie fiber's water absorption.But it usually has low storage stability.For improving the storage stability,the property of Melamine formaldehyde resin is modified by polyvinyl alcohol.

实验发现，三聚氰胺甲醛树脂可降低苎麻纤维的吸水率，但三聚氰胺甲醛树脂存放稳定性差，加入聚乙烯醇进行改性可显著改善三聚氰胺甲醛树脂的贮存稳定性。

The direct electrochemical behaviors of horse radish peroxide on the bare glassy carbon electrode and the ODA-HMS PVA membrane modified electrode were studied, respectively.

实验结果表明：HRP在裸玻碳电极上和滴涂法所制备ODA-HMS聚乙烯醇凝胶膜中的直接电化学行为较差，只呈现一不可逆的还原峰，且峰电流随着扫描次数的增加不断减小，无法达到稳定。

The aim of this study was to discuss the optimizing preparation conditions of polyvinyl alcohol hollow microsphere and its application in the production of slow-release urea fertilizer.

［目的］探讨聚乙烯醇空心微球的优化制备条件及其在尿素缓释肥生产中的应用。

Polyvinyl alcohol has been used industrially as a dispersant in the synthesis of the polymer emulsions of vinyl acetate.

聚乙烯醇已用于工业作为分散剂在合成聚合物乳液醋酸乙烯酯。

Doped AgBr emulsion had an optimal amount with AgBr to silver stearate of 1∶4 in PTG materials.

由Zou以及Sahyun[1]等人在早期报道的，粘合剂采用溶剂型聚乙烯醇缩丁醛，卤化银采用原位法合成时的PTG材料的化学增感无效，照相速度的提高总伴随着灰雾的增加；他们认为当卤化银颗粒与羧酸银有界面存在时，传统化学增感的效果不明显；由Yamane[2]等人于近期报道的

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。