Preparation of chitosan with high degree of deacetylation using ultrasound - assisted technology 超声波辅助制备高脱乙酰度壳聚糖
2.
Synthesis and characterization of graft acrylamide onto different degree of deacetylation value of chitosan 不同脱乙酰度壳聚糖接枝丙烯酰胺的合成与表征
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Manufacture chitosan a natural , biodegradable polymer fiber obtained through the deacetylation of chitin -从事塑料制品的研制开发和生产包括护栏， pvc护栏等。
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The results manifest that it is advisable to prepare certain molecular weight cm - ch from corresponding mw ch ; deacetylation degree and carboxymethyl degree of ch are unchanged after a series of reactions 实验结果表明：可以由特定分子量ch制备相应分子量的cm - ch ； ch经系列反应后，脱乙酰度和羧基化度稳定。
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Chitosan is the product of partial deacetylation of chitin they are the second most abundant polysaccharides in nature , comprising the horny substance in the exoskeletons of crabs , shrimp , and insects as well as fungi 背景和目的几丁质是由n -乙酰葡萄糖胺组成的多糖，它是世界上除纤维素之外含量最丰富的天然多聚物。
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Chitin possesses special character and usage after modification such as modified as sulphonation , carboxymethylation , deacetylation etc . the derivatives are widely used in the fields of chemical industry , medicine , food , cosmetics , printing and dyeing , papermaking , environmental protection and agriculture etc . chitin is the ba 甲壳素经过化学修饰和改性，如磺化羧甲基化脱乙酰化等可获得具有特殊性质和用途的甲壳质系列衍生物，在化工医药食品化妆品印染造纸环保农业等领域具有广泛用途。
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In this paper , the relationship on inherent viscosity , degree of deacetylation and degree of carboxymethyl has been studied ; the preparation process of cx - 2 , the histocompatibility and the animal cell culture have been described . the results provide foundational theories for preparation of the mcs and application in large - scale animal cell culture . cm - ch is a water - soluble derivative of chitosan 依次进行了cm - ch特性粘度、脱乙酰度、羧基化度的研究； cx - 2微载体的制备工艺优化研究； cx - 2微载体的组织亲和性研究以及动物细胞培养实验，为新型微载体的规模化制备及应用提供了一定的理论依据。
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We suggest : ( 1 ) histone must maintain some acetylation level whether the associating - gene is activated or inactivated ; ( 2 ) acetylation and deacetylation are global in these genes " chromosomal domains ; ( 3 ) but uneven ; ( 4 ) and the level will change according to the development stage 通过我们的实验，我们认为无论基因表达与否，都首先在其基因组上维持了一定的组蛋白乙酰化水平，这种乙酰化水平同时也是一个整体的概念，而且在不同的基因区域上，组蛋白乙酰化水平是有一定的波动性，另外这种乙酰化水平可以随着发育阶段的不同根据基因表达的要求发生变化。
