查询词典 chitin

The application and study progress of chitin fiber are introduced, and the prospect of application of chitin fiber as a novel paperm aking raw material in the paper''s antibiosis is discussed.

摘 要：介绍了当前抗菌纸的主要用途、生产技术及其存在的不足，叙述了甲壳素纤维的应用和研究进展，展望了其作为一种新型造纸原料应用于纸张抗菌的前景。

In order to discuss the structural and physical properties of staples from the blend solution of cellulose xanthate with chitin xanthate,blend staples with 0.92%,3\^54%,6\^46% and 8\^62% chitin content were prepared.

为了探讨不同共混比的纤维素黄原酸酯、甲壳素黄原酸酯共混溶液所制得短纤维的形态结构和物理性能，选择了甲壳素质量分数分别为 0 。92 %、3 。5 4 %、6 。

Chitin is one of the most abundant nature resources, chitosan is deacetylated from chitin.

甲壳素在自然界中的资源相当丰富，壳聚糖是甲壳素脱乙酰的产物。

Given that the mice had not been previously exposed to chitin, Locksley wondered,"What actually sensed the chitin in the mice?"

假定该实验用小鼠先前没有接触过甲壳素，洛克斯利惊讶于："小鼠体内是什么实际感知甲壳素的呢？"

Locksley believes that AMCase, comparable to the chitinolytic enzyme found in marine and soil bacteria—and likely conserved in human evolution—attenuates the chitin-induced innate immune response by degrading the chitin.

洛克斯利相信AMCase比得上在海洋和土壤细菌中发现的甲壳素消化酶－并且可能在人类进化中保存下来了－通过降解甲壳素减弱了甲壳素诱导的先天性免疫反应。

Except heptanoyl chitin, four of them,i.e.acetyl chitin,propionyl chitin,butyryl chitin and hexanoyl chitin,had high degree of substitution(from 1.5 to 2.0)and exhibited lyotropic liquid crystalline behavior and cholesteric phase.

文摘：四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相。

Object In this study we framed the refusion gene antibacterial peptide[ Cecropin A(l ~ 8)- Magainin (1 - 12),CA(1 ~ 8)-MA(l ~12),CAM] vetor and expressed it in the Escherichia.coli. Thenpurified the recombinded peptide in the Intein Mediated Purificationwith an Affinity Chitin-binding Tag-IMPACT system.

目的 构建重组基因抗菌肽[Cecropin A(1～8)-Magainin(1～12)，CA(1～8)-MA(1～12)，CAM]质粒载体并在大肠杆菌(Escherichia.coli)中表达，应用几丁质自切割分离纯化系统(InteinMediated Purification with an Affinity Chitin-binding Tag，IMPACT)分离纯化抗菌肽，并测定其抗菌活性。

According to the present situation of Hebei province, chitin was extracted from waste crab shells of Qing Huangdao, and then chitosan was prepared. On the base of those, a series of chitin/chitosan derivatives were synthesized and characterized. Finally,~then they were applied in fruit preservative, flocculation and cosmetics. The main results ~re summerized as follows:(1) Chitosans with low, middle and high viscosity have been prepared from chitin, which was extracted from waste material of crab shells produc ed in Qing HuangDao.

并对针对河北省的资源情况，从秦皇岛蟹壳废料中提取甲壳素，制备壳聚糖，在此基础上制备了一系列甲壳素/壳聚糖的衍生物，对其结构与性能进行深入的研究，并开发其在食品保鲜、污水处理、化妆品等方面的应用，具体分述如下：（1）以所提取的甲壳素为原料，在浓碱溶液中通过正交实验法对壳聚糖的制取条件进行优化，确立制备低、中、高三种粘度壳聚糖的最佳条件。

Glycosidic bond of chitin could be cut off selectively in the degradation of chitin and soluble chitin of part deacetylation could be obtained.

甲壳质的酶法降解，可选择性地切断甲壳质的β-1，4-糖苷键，可得到部分脱乙酰化的可溶性甲壳质。

The results suggested that chitinhad a good solubility in the new solvent when its at -30℃and below, but the solubilityof chitin no longer increasesd notable as the temperature reduced; The joined of urea, incertain degree, strengthened the solvency of alkali solvent to chitin. When theconcentration of sodium hydroxide is 8%～12%, Chitin had a good solubility, and theapparent viscosity of chitin solution could up to 4000 mpa·s～5000mpa·s at roomtemperature; In addition,the solubility of chitin in new solvent was high when therefrigerated time was three days and above, but the refrigerated time could not too long,otherwise, the deacetylize degree of chitin got more bigger. The properties of chitin solution were tested by revolving viscosimeter, FT-IR,X-RD and so on.

结果表明，在-30℃及以下甲壳素能很好的溶解于新溶剂中，但甲壳素的溶解度不再随温度的下降而有所增大，而是基本保持不变；尿素的加入，在一定程度上强化了强碱溶剂对甲壳素的溶解，当新溶剂中NaOH浓度为8％～12％时，甲壳素在试验温度下可以获得较好的溶解度，所得溶液在室温下的表观黏度达4000 mpa·s～5000mp·s；冷冻时间为3 d及以上时，有利于甲壳素的溶解，超过3 d，甲壳素的溶解度变化不大，另外，冷冻条件下，甲壳素在强碱溶剂中仍会发生脱乙酰化反应，冷冻时间不宜太长。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。