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Guanosine overproducing mutant was derived from Bacillus subtilis T1001 by using ultraviolet and diethyl sulfate. The mutant was selected directionally and step wisely on the agar plates containing methionine sulfoxide and 8 azaguanine(8 AG).

以枯草芽孢杆菌T1 0 0 1为出发菌株,经紫外线、硫酸二乙酯逐级诱变处理,选育出腺嘌呤缺陷型菌株,然后经蛋氨酸亚砜、8 氮鸟嘌呤( 8 AG)结构类似物平板定向筛选,获得鸟苷高产菌株TA2 0 8。

Treatment of the diacetoxy-calix [4] arene with a series of ditosylates in dry MeCN in the presence of NaOH resulted in formation of electron-rich calix [4] areneocrowns, which reacted with 4, 4'-bipyrindinium and p-bis -benzene at room temperature in dry MeCN to afford self-assembling [2] catenanes by π-π stacking interaction.

以杯[4]芳烃为原料,通过三氟乙酸铊将其氧化成醌,醌类化合物在Zn粉、冰醋酸、少量盐酸和过量的乙酸酐中反应得到双乙酰化产物,利用氢氧化钠使其水解,然后再与各种对甲苯磺酸二酯进行环化反应,得到一系列具有富电子空腔的杯[4]芳烃并冠醚。

In this thermodynamic study, the minimum requirements in molar fraction of the solvents (x3) on the azeotropic feed plate are: 0.20 for N,N-dimethylformamide, 0.36 for 2-ethoxyethanol, 0.40 for 1-pentanol and 0.66 for butyl propionate,.

在这个热力学研究中,共沸混合物喂料盘上各溶剂摩尔分数最小值(x3)分别是:N,N-二甲基甲酰胺:0.20;2-乙氧基乙醇:0.36;1-戊醇:0.40;丙酸丁酯:0.66。

Several glycosyl phosphate and phosphonates, as inhibitors of AGPase, were synthesized.In the synthesis of β〓-6 linked oligosaccharide phosphonates, A new method was developedfor preparation of 〓,6-〓-di-acetyl-2,3,4-〓-tri-benzyl-D-hexoses by acetylation of benzylatedmethyl glycosides in high yield under the conditions of 〓 and cat.〓.

合成了一些磷酸酯及其类似物作为嗜热AGPase的抑制剂,在研究β 1-6连接的寡糖膦酸酯的合成中,发现了制备1,6-〓-二乙酰基-苄基保护糖的新方法:苄基保护的糖苷在醋酐和催化量的硫酸作用下,在0℃反应进行7-10 min,可以选择性、高收率地得到此化合物。

Application of reverse micella enzyme system in oil industry;2. Synthesis of ethyl oleate catalyzed by Lipex lipase in AOT/isooctane reverse micella r system was studied.

在二-(2-乙基己基)琥珀酸酯磺酸钠和异辛烷构建的逆胶束体系中,以Lipex脂肪酶为催化剂,合成了油酸乙酯,考察了各影响因素对其产率的影响,并进行了脂肪酶紫外荧光检测和体系粒度分析。

This paper presents a description of the brief synthesis of hexanoic acid 2-ethyl ester by new methods and its application. It takes two steps and 4.5 h to complete the synthesis of it.

己酸二乙氨基乙醇酯(DA 6)由美国科学家于20世纪90年代初首先发现的一种新型植物生长调节剂,具有高活性,低毒无污染、可与其它农化物质兼容的特点,它的合成与应用研究正日益受到人们的重视[1~7]。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。