值得注意的是， 这种糖片段上有芳环取代的烷酰氧基基团的麦角甾烷型甾体糖苷为真菌中首次报道。
It is worth while to note that the steroidal glycoside possessing an aromatic ring substituted alkanoyl group at its glucose moiety was found for the first time in fungi .
采用本发明的拆分方法制备单一手性2-杂环取代的 二氢嘧啶化合物的产物收率为20％以上，光学纯度达98％以上；
The splitting method adopted for preparing single chiral 2-heterocycle substituted dihydro pyrimidine compounds has the product yield more than 20 percent and the optical purity above 98 percent;
报道了通过串联环加成芳构化反应合成多取代芳族化合物的方法。
The synthesis of polysubstituted aromatic compounds by using a tandem cycloaddition aromatization reaction was reported.
环氧胶接接头在水中破坏失效的原因主要是渗入到胶接层的水分子取代了胶粘剂分子在金属表面的粘附。
The reason of the failure of epoxy bonded joint in water was that the epoxy adhesive on the metal surface was substituted for water.
本文以马铃薯淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂对低取代度羟丙基淀粉的制备工艺进行了研究。
Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.
用新型绿色溶剂取代传统的二甲苯等有毒溶剂，并对环氧丙烯酸树脂的合成工艺进行改进。
Such traditional poisonous solutions are replaced with dimethylbenzene to improve the synthesis technology of epoxy acrylic resin.
对所有共振谱线进行了全面归属，并讨论了不同取代基和环内不同杂原子对化学位移值的影响。
All of the resonance lines were fully assigned and the effects of substituents and heteroatoms in ring on chemical shifts were discussed.
重点介绍了金属茂的合成方法及环戊二烯环上的取代基、溶剂对合成及分离旋光性金属茂的影响。
The synthesis of metallocene, the effects of substitution in cyclopentadiene ring, reaction medium for synthesis and separation of chiral metallocene have been highlighted.
芳环上取代基性质对产物分布的可调性具有重要的影响。
The properties of the substituents on aromatic ring would influence whether the product distribution could be controlled conveniently.
有双环氨基取代的吡啶酮羧酸衍生物，其酯及盐，以及可用作其中间体的双环类胺。
Pyridonecarboxylic acid derivative substituted by bicyclic amino group, ester thereof, salt thereof, and bicyclic amine as intermediate thereof.
新的硫取代含氮杂环膦酸化合物，药物组合物，和治疗钙与磷酸盐异常代谢的方法。
Novel thio-substituted, nitrogen-containing, heterocyclic phosphonate compounds, pharmaceutical compositions, and methods of treating abnormal calcium and phosphate metabolism.
从而以高收率得到带各种取代基的环丙烷。
所得的三环化合物经热分解和加氢反应，制备顺式和反式- 2,5 -二取代四氢呋喃。
The cis - or trans-2, 5-disubstituted tetrahydrofurans were provided by the hot decomposition and then hydrogenation of tricycle compounds produced.
摘要碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
Carbasugars carbocyclic analogues of true sugars are compounds in which the ring-oxygen of furan oid or pyranoid sugars is replaced by methylene group.
本论文首先将模糊控制应用于变频调速系统的转速环，取代常规的PI调节器，旨在提高系统的抗干扰能力。
In this paper, speed loop adopting fuzzy control scheme which takes place of common PI controller, is to improve the performance of disturbance rejection.
对环上氟取代负介电各向异性液晶的结构、性质和应用作了论述。
The structures, properties and applications of laterally fluorinated negative dielectric anisotropy liquid crystal compounds are reviewed.
阐述了酞菁环的电子结构是其具有气敏性的基础，讨论了配合物中的中心原子和取代基团对配合物气敏性的影响。
The fundamental function of the electron structure of the ring skeleton and the influence of central atoms and substituents on gas-sensitivity is illustrated.
研究表明配位键的强度不仅受取代基R的影响，而且还与环结构的变化有关。
The strength of the dative bond deponds not only on the substituents R, but also on the skeletal structure of the parent ring.
卟啉的平均分子结构简式衡量其取代基的组成，尤其对地质体中相同碳数的卟啉“ 混合物” 大环外取代基的构成十分有效。
The average condensed formula of molecular structure is effective to derive the composition of the peripheral substituents of porphyrins, especially geoporphyrins with identical carbon numbers.
生测结果表明在吡啶环的2位合适的取代基和丙烯酸酯的3位取代基的体积对除草活性至关重要。
These results indicated that a suitable substituent at the 2-position of pyridine ring and a well-fit group at the 3-position of acrylate were both essential for hi.
利用PLC高速计数模块直接将外部编码器发出的脉冲读入，在PLC内部编程，通过程序控制完全能取代位置控制器的所有功能，从而省出位置控制器这一环节。
The pulse is directly read out by utilizing PLC high-speed counting module, the function of the locating controller can be achieved by program, thus the locating controller are saved.
氢的替代亲核取代反应(VNS)是与硝基芳环的亲电反应、亲核反应不同的一种新反应。
Vicarious nucleophilic substitution (VNS) of hydrogen is a new type of reaction which is different from the usual electrophilic and nucleophilic reactions of the nitro arenes.
本文报道用环加成-芳构化串连反应制备多取代芳香族化合物的方法。
The synthesis of polysubstituted aromatic compounds by using tandem cycloaddition aromatization reaction was reported.
桥二环辛烷不给出有意义的桥头取代。
Bridged bicyclooctanes gave no significant bridgehead substitution.
分析了芳环上取代基对氢重排的影响。
The effect of the substituents on the aromatic ring upon the hydrogen rearrangement was studied.
采用非等温差示扫描量热法(dsc)研究了一种长侧链取代液晶环氧单体与甲基六氢苯酐的固化反应历程，考察了体系的固化反应动力学特征。
A liquid crystalline epoxy monomer with long lateral substituent was cured with anhydride and the cure kinetics was investigated by non-isothermal DSC technique.
更具体而言，本发明涉及一种或多种环酸酐或取代环酸酐作为活性载体的用途。
More particularly, the invention relates to the use of one or more cyclic anhydrides or substituted cyclic anhydrides as the reactive carrier.
通过变换环上的取代位置，可以有效地调控环的电性质，从而调控单分子膜的电化学性质。
By changing the replacement position, the electrical properties of rings could be controlled effectively, so did the electrochemical properties of SAMs.
气流纺纱是一种常用的纺纱方法，并且已经取代了一些环锭纺纱设备。
The final process in ring spinning of single yarn is the spinning operation.
气流纺纱是一种常用的纺纱方法，并且已经取代了一些环锭纺纱设备。
The final process in ring spinning of single yarn is the spinning operation.
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