查询词典 deacetylation

Histone acetylation and deacetylation are crucial in the regulation of gene expression.

组蛋白乙酰化和去乙酰化对基因表达的调控至关重要，基因表达的动态变化将会影响染色质的结构。

Histone acetylation and deacetylation can regulate many chromosome functions, such as gene expression and chromosome segregation.

组蛋白乙酰化和去乙酰化可调节染色体的多种功能，例如基因表达和染色体分离等。

Alkalimetry is standard method of determining degree of deacetylation of chitosan generally applied in aquaculture and other industry.

碱量法是水产行业测定壳聚糖脱乙酰度的标准方法，应用广泛。

Chitosan is obtained by N-deacetylation of chitin. It has a number of free amino group.

壳多糖是甲壳质脱乙酰基的产物，它含有大量的自由氨基。

Chitosan, derived from the deacetylation of chitin, is rich in nature.

低分子量的水溶性壳聚糖具有独特的生理活性和药用价值。

Deacetylation of chitin was studied under different conditions, such as different temperature, time and concentration of alkaline.

在甲壳素脱乙酰化反应的研究中，分别采用不同的反应条件：NaOH溶液浓度分别为40％和50％，温度分别为80℃，90℃，100℃，110℃，120℃，反应一定时间，测试产物壳聚糖的脱乙酰度。

The method controls the catalytic speed of the microencapsulation glucose oxidase through adjusting the molecular weight and the degree of deacetylation of microcapsule exine chitose, thereby the method is beneficial for oxidation-linking of gluten protein and for increasing the quality of the flour and flour products, simultaneously, the glucose oxidase after microencapsulation avoids the contact between enzyme and the flour and improves storage and the stability, and the microencapsulation glucose oxidase is excellent flour modifying agent and accords with practical production and application.

该方法通过调节微胶囊外壁壳聚糖的分子量和脱乙酰度，控制微胶囊内葡萄糖的催化速度，从而有利于面筋蛋白的氧化交联，提高面粉及其制品的品质；同时葡萄糖氧化酶经微胶囊化以后避免了酶与面粉的接触改善了贮藏和稳定性，是优良的面粉改良剂，符合实际生产应用。

To evaluate the effect of deacetylation degree on the gelation behavior of thermosensitive chitosan-β glycerol phosphate disodium salt pentahydrate system and to compare their rheological behaviors before and after gelation.

目的 研究壳聚糖（chitosan，CH）脱乙酰度（degree of deacetylation，DDA）对CH-甘油磷酸盐温控体系凝胶化行为的影响，同时比较其在凝胶形成前后的流变学行为差异。

Themain contents of this dissertation are as follows:(1) The quality analytiedal results of chitosan are as follows: water for 15.205%;degree of deacetylation 92.671%; the weight average relative molecular weight ofchitosan 195900; the viscosity average relative molecular weight of chitosan 194100;and the decomposing temperature 298℃. The infrared ray IR spectra of chitosanshows that the feature-absorbing band of chitosan amido was 1601cm~(-1), that ofβ-indican bond was 986cm~(-1). The results of the X-ray diffraction of chitosan indicatesthat its degree of deacetylation and degree of crystal are both big.

本文的主要内容如下：(1)对壳聚糖的质量进行分析，其水份为15.205％，脱乙酰度为92.671％，重均分子量为195900，黏均分子量为194100，分解温度为298℃，壳聚糖的红外光谱表明，壳聚糖—NH_2的特征吸收峰为1601cm~(-1)，β-糖苷键的特征吸收峰为986cm~(-1)，壳聚糖的X-衍射图表明壳聚糖原料的脱乙酰度和结晶度均较大。

Accuracy of determination of deacetylation degree of chitosan by two abrupt change conductometric titration was studied, and effects of chitosan solution concentration, viscosity and deacetylation degree on the result of equivalence point were also investigated.

结果表明：壳聚糖样品质量浓度控制在2～6g/L，利用双突跃电位滴定法可以测定壳聚糖的脱乙酰度，不同样品脱乙酰度测定结果RSD小于0.61%(n=3)，该方法具有较高地准确性，可以用于壳聚糖生产和加工过程中的质量控制与检测

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。