查询词典 acetoin

Then fed-batch fermentation was performed with glucose feeding. The yield of acetoin achieved at 20 g/L in fed-batch fermentation with glucose feeding.

在优化的发酵条件下，采用分批补糖的工艺，摇瓶发酵产量可稳定在20g/L以上，为3-羟基－2-丁酮的工业化生产提供了一定的基础。

The results also indicated a low production of acetic acid, acetoin and ethyl acetate, and high amounts of amyl alcohols in all of the ciders.

结果在全部萍果汁也表明了乙酸、乙醛和乙酸乙酯旳低产量和大量产生旳戊基乙醇。

Biological production of acetoinvia the fermentation pathways with acetoin and mixed-acid.

乙偶姻的发酵制备过程是同时生成乙偶姻与混合酸的过程。

The experimental results showed that the partition coefficients and yields of 2,3-butanediol and acetoin reached 11.9,9.10,83.48%, 79.37%,respectively,when the concentration multiple was 70%,the concentration of K_2HPO_4 added was 45%,and the concentration of 2,3-butanediol in top phase reached

结果表明：当发酵液浓缩70%后，加入45%的磷酸氢二钾，乙偶姻、2，3-丁二醇的分配系数最高，分别为11.9、9.10；回收率较高，分别为83.48%、79.37%；上相中2，3-丁二醇浓度最高可达420g/L。

When ALDC is used, diacetyl cannot come into being, thus it can leave out the course of diacetyl being deoxidized to Acetoin and shorten the fermentation cycle, heighten the beer output, reduce the cost.

aldc的时候是用二乙不能应运而生，因此，可以漏下过程中的双乙酰被还原为乙，并缩短发酵周期，提高啤酒产量，降低生产成本。

Acetoin dehydrogenaseactivity both in mutant strain UV-3 and the parental strain 10293 were lower than 0.001U/mg.

乳酸脱氢酶、双乙酰还原酶和α-乙酰乳酸脱羧酶三种酶活最低的pH分别为7.0、7.0和7.5左右。

The optimized system was composed of 34% isopropanol and 20%(NH_4)_2SO_4,yielding the partition coefficients of 8.29 and 8.98 for 2,3-BD and acetoin,respectively.

再次，对新型双水相分离体系—异丙醇/硫酸铵体系从发酵液中萃取分离2，3-丁二醇进行了研究。

In this paper, the synthesis ways and applications of 4,5-dimethyl-l,3-dioxolen -2-one were introduced. An appropriate way synthesizing DMDO from acetoin via acylation, cyclization and dehydrochlorination was selected. The influences of various process conditions on the reaction were studied in detail, and the optimum process conditions were obtained by single factor experiments.

本文介绍了医药中间体4，5-二甲基-1，3-二氧杂环戊烯-2-酮的应用情况和合成路线，选择了适于工业化生产的工艺路线，即采用羟基丁酮为原料，经酰化、环合和脱氯化氢等步骤合成DMDO，并采用单因素试验法详细研究了各项工艺条件对反应结果的影响规律，确定了优化工艺条件。

The final concentration of target products(2,3-BD and acetoin) in a fed-batch fermentation carried out under the optimized conditions was 42.60 g/L with a productivity of 0.76 g/L·h in 56 h, corresponding to 23%of yield from glucose.

在该条件下进行批式流加发酵，可以获得目标产物浓度为42.60 g/L，生产强度为0.76g/，葡萄糖的质量转化率为23%。

The catabolites of acetoin metabolism such as 2,3-butanediol and acetaldehyde as well as other carbohydrates including galactose, lactose, and glycerol did not affect the expression of Paco and PacoK, whereas maltose stimulates the expression of PacoK at 210 min.

其他的乙醯甲基甲醇代谢物如2， 3-丁二醇与乙醛，以及其他糖类包括半乳糖，乳糖和甘油对acoABCD及acoK启动区的表现能力并无明显影响，而在210分钟时，麦芽糖则可刺激acoK启动区的表现。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。