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natural product     
相关语句
  天然产物
     Total synthesis of natural product(E)-4′-methoxy-3,5-dihydroxy-stilbene
     天然产物(E)-4′-甲氧基-3,5-二羟基■的合成研究
短句来源
     In addition, a new natural product, namely, 24-methyllenelanost-9 (11)-en-3β-ol acetate (V1) was isolated from the plant.
     此外,我们还分离得到1个新的天然产物,即24-亚甲基羊毛甾烷-9(11)-烯-3β-醇乙酰化物(24-methyllenelanost-9(11)-en-3β-ol acetate,V1);
短句来源
     2D NMR Study on Solution Structure of Natural Product 3′-Methoxy Puerarin
     天然产物3′-甲氧基葛根素溶液结构的二维NMR研究
短句来源
     Cis-shegansu B (5) is a cis isomer of shegansu B. (+)-bisisorhapontigenin A (6) is isolated as a natural product for the first time.
     cis-shegansu B(5)为二聚体射干素B的顺式异构体; (+)-Bisisorhapontigenin A(6)为首次以天然产物形式得到的异丹叶大黄素二聚体;
短句来源
     Studies on Action Receptor to Natural Product Epibatidine
     天然产物Epibatidine的作用受体初探
短句来源
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  天然产品
     SDS PAGE and Western blot showed that the Molecular Weight of the excreted recombinant bFSH β was the same as that of natural product which is 14 000 daltons.
     表达产物经SDS-PAGE,Western-blot分析表明:所表达bFSH-β的分子量同天然产品相同,为14000D,并具有免疫活性。
短句来源
     Propolis,claimed to be medicines for swarm of bees, is a kind of natural product that possessesthe biological characteristic of anti-oxidation, antiviral property, anti-bacteria,anti-fungus, anti-tumour, anti-protozoan and improving immune ability.
     蜂胶是蜜蜂的一种天然产品,号称蜂群的药物,其有效成分复杂,具有抗氧化、抗病毒、抗细菌、抗真菌、抗肿瘤、抗原生动物以及免疫增强等多种生物学活性。
短句来源
     The toxicity and allergic reaction about propolis are also investigated, it can be concluded that propolis is a relatively non-toxic natural product, and can be used in medicine, food and other aspects safely. 
     同时讨论了蜂胶的毒性和过敏性,指出蜂胶是一种毒性很低的天然产品,可以安全地应用于医药、食品等方面.
短句来源
     There are about 600 enterprises,13types and above 2000 kinds product. It is common that is vitamin,mine matter,natural product,fish oil,composite pure matter,bee products,and 39 health foods divided into by the diseases.
     现有生产企业约600家,生产保健品13大类2000余种,常见的有维生素、矿物质、天然产品、鱼油、合成单体、蜂产品以及按疾病划分的39种保健食品。
短句来源
  自然产物
     In our country, the criminal mediation is the natural product of harmonious thought, it is long in our country's history, and it is regarded as "the East experiences".
     在我国,刑事调解是和谐思想的自然产物,其历史悠久,并被誉为“东方经验”。
短句来源
     The plea bargaining of American style is the natural product in the partyism of the U.S.;
     美国式的辩诉交易是在美国当事人主义诉讼架构下的自然产物 ;
短句来源
     The main body and its operation in the collective consultation and discussion of the wool trade are the natural product under the environment of the basic law system in China, it can solve the contradictions of the employee-employer relations at the lowest transaction expenses.
     羊毛新行业集体协商中的主体及其运作是中国现在基本法律制度环境的自然产物,它能以最低的交易费用解决劳资关系矛盾。
短句来源
  天然物
     STUDY ON THE SOLVENT EXTRACTION METHOD BY ULTRASONIC RADIATION(Ⅱ) Separation Of Solid Constituents From Solid Natural Product
     超声溶剂提取方法研究——(Ⅱ)固态天然物中固体组份的提取
短句来源
     This thesis reviewed the medical activity of Juglone, a natural product, and summarized the previous synthesis methods of Juglone, and a detailed evaluation of them provided some helpful comments for the subsequent synthetic researches of Juglone.
     本文首先回顾了胡桃醌作为一种天然物的药理活性,对几种通过不同途径来合成胡桃醌的研究进行了概括与综述,探讨它们的优与劣,从而为以后的胡桃醌的合成研究提供有益的借鉴。
短句来源
     The present review surveys recent advances in uses of N hydroxyamide in cyclization, regioselective introduction of nucleophiles, dienone phenol rearrangement and synthesis of natural product.
     近几年,N- 羟基酰胺的开发利用已在氮杂环合、位置选择地引入各种亲核试剂、二烯酮-苯酚重排以及在天然物合成方面取得突破性的进展.
短句来源
     The antiviral mechanism of natural product PZ 1 was studied by TMV/tobacco system . The antiviral (TMV) active compound PZ 1 was isolated from Chinese medicine plant.
     以烟草花叶病毒 (TMV) /烟草为测试体系 ,研究了天然物 PZ1抗病毒 TMV作用机理。
短句来源
     The synthesis unambiguously confirmed the structure of the natural product 1 as 24-methylenecholest-4-en-3β,6β-diol.
     合成化合物1的光谱数据与分离得到的天然物完全一致。
短句来源

 

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      natural product
    Kressman were in fact a modified natural product-impregnated parchment membranes.
          
    IR spectrum and normal mode analysis of the antiAlzheimer's disease natural product Huperzine A: A quantum chemistry density-fun
          
    Fluorometric enzyme immunosensing system based on natural product resveratrol for horseradish peroxidase and Ag/SiO2 nanoparticl
          
    The system is described and its practical applicability is demonstrated with the isolation of compounds from a natural product.
          
    Complex matrices of a plastic material, a natural product and a soil spiked with a substituted hydrocarbon test mixture were analyzed to show the usefulness of the interface.
          
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    The degradation of sipeimine by zinc dust distillation and selenium dehydrogenation gave the same products as those previously obtained from peimine. 2,5-Lutidine was found in the alkaline portion and two hydrocarbons, C_(18)H_(14) and C_(20)H_(18) or C_(22)H_(20) were found in the neutral portion. The hydrocarbon C_(18)H_(14) has been proved by synthesis to be 8-methyl-1,2-benzfluorene, so far first obtained from the degradation of natural products. Thus sipeimine, peimine and peiminine most probably...

    The degradation of sipeimine by zinc dust distillation and selenium dehydrogenation gave the same products as those previously obtained from peimine. 2,5-Lutidine was found in the alkaline portion and two hydrocarbons, C_(18)H_(14) and C_(20)H_(18) or C_(22)H_(20) were found in the neutral portion. The hydrocarbon C_(18)H_(14) has been proved by synthesis to be 8-methyl-1,2-benzfluorene, so far first obtained from the degradation of natural products. Thus sipeimine, peimine and peiminine most probably have the same skeleton, belonging to the group of modified steroidal alkaloids. The empirical formulae and functional groups of sipeimine and peiminine are the same, and the ultraviolet absorption spectra (Fig. 1) of both alkaloids are practically iden- tical. It is probable that sipeimine and peiminine differ slightly in structure or merely differ in configuration.

    1.西貝素用鋅粉蒸餾及硒脫氫,產物中的鹼性部分得2,5-二甲基吡啶(Ⅱ),中性部分得碳氫化合物C_(12)H_(14)(III)及C_(20)H_(18)或C_(22)H_(20)二種。與由貝母素甲用同法處理,所得結果相同。其中C_(18)H_(14)(III)已由合成證明為8-甲基-1,2-苯弗。此種碳氫化合物,在天然產物降解中,尚屬首次得到。 2.西貝素與貝母素乙均屬於變形(石享)類植物鹼。它們的實驗式及功能團是相同的。它們的紫外吸收光譜,幾乎完全符合,其結構式可能稍有差別,或僅是構型的不同。

    Cucurbitine, the active principle of Cucurbita moschata, which inhibited the growth of immature Schistosoma japonicum, was shown to be either 4-amino-3-carboxylpyrrolidine or 3-amino-3-carboxylpyrrolidine. Attempts have been made in the present work to synthesize these two compounds in order to find out which one is identical with the natural product.

    1,3-双(乙氧甲酰基)氮戊环-4-酮与羟胺作用,变为肟,后者经催化氢化,并再与酸作用,得到4-氨基-3-羧基氮戊环(Ⅰ)。1-乙氧甲酰基氮戊环-3-酮与氯化铵及氰化钾作用,继用氢溴酸水解,制成(±)-3-氨基-3-羧基氮戊环(Ⅱ)。动物试验中Ⅱ有抑制血吸虫童虫生长的作用,Ⅰ则无效,红外吸收光谱及纸上层析的R_f值观察中,Ⅱ均与天然南瓜子氨酸一致。于是,将Ⅱ制成(+)-樟脑酸盐,以水及丙酮混合剂纯化拆开,获得(一)-3-氨基-3-羧基氮戊环(+)-樟脑酸盐,并制成相应游离碱及高氯酸盐,又酰化成二苯甲酰及二对硝基苯甲酰衍生物。以上各化合物的比旋光度及熔点与天然南瓜子氨酸相应衍化物一致,证明天然南瓜子氨酸是(一)-3-氨基-3-羧基氮戊环。左旋体樟脑酸盐分去后,从母液中又得到右旋体。动物试验中左旋体对日本血吸虫童虫有明显抑制作用,右旋体则无效。

    Chairman Mao taught us, "One should seriously sum up one's experience." Looking back at the experiences of our own and of others in the past decade or so on the total synthesis of proteins and polypeptides, we have analyzed the inherent contradictions of the two alternative routes of synthesis on the basis of the dialectical viewpoint of "one divides into two". Either the solid phase or the solution synthesis is fraught with difficulties when the target exceeds 100 amino acids. A new synthetic strategy was developed...

    Chairman Mao taught us, "One should seriously sum up one's experience." Looking back at the experiences of our own and of others in the past decade or so on the total synthesis of proteins and polypeptides, we have analyzed the inherent contradictions of the two alternative routes of synthesis on the basis of the dialectical viewpoint of "one divides into two". Either the solid phase or the solution synthesis is fraught with difficulties when the target exceeds 100 amino acids. A new synthetic strategy was developed which we believe could resolve the contradictions inherent in the synthesis of large peptides-the solid phase stepwise condensation of peptide fragments instead of amino acids. Following repeated practice guided by the spirit of independence and self-reliance, we succeeded in synthesizing first of all a new supporting medium which provisionally met our requirements. We shall describe in the present paper the successful total synthesis of the nonacosapeptide glucagon using this supporting medium. Four peptide fragments (5, 6, 9, 6), synthesized with the aid of classical methods, were coupled stepwise to a resin-bound tripeptide, with an efficiency of over 95% for each step. After treatment with hydrogen fluoride and purification twice by means of column chromatography, rhombic dodecahedral crystals of glucagon could be obtained which were identical with natural products in respect of amino acid composition, chromatographic and discelectrophoretic behaviour, etc. The overall yield was about 17%. In view of the characteristic abundance in glucagon of various kinds of functional groups which impart unfavourable obstacles to the course of synthesis, this relatively high yield and the ease with which crystalline products could be obtained testify to the potential of the new technique in the eventual total synthesis of larger proteins.

    遵照毛主席关于“要认真总结经验”的教导,作者在回顾十年来多肽合成发展过程的基础上,运用一分为二的唯物辩证观点分析了目前已有的两类合成方法都难以合成含100个氨基酸残基以上的大蛋白质的内在矛盾,指出了可能解决矛盾的途径之一,一个新的合成方案——片段固相缩合法。在“独立自主、自力更生”方针的指引下,通过反复实践,我们合成了初步满足新方法所需要的新材料——表层树脂。本文报导合成胰高血糖素(29肽)的结果,目的是对新方法进行一次考验:先将用经典法合成的四个肽片段(5,6,9,6)在三肽树脂上依次进行缩合,每次缩合率皆达95%以上,全合成以后经过氟化氢处理,两次柱分离纯化,便可获得氨基酸组成、层析及碟状电泳等物化行为与天然品相同的,具有高效增血糖活力的胰高血糖素结晶——正交十二面体。全过程总得率可达17%。根据在胰高血糖素的组成中含有侧链功能团氨基酸较多的特点,在虽然给人工合成过程带来不利影响的情况下仍能获得较高缩合率及通过简单分离即能纯化结晶的结果,说明这一方法有可能为人工合成具有严格结构的较大蛋白质提供一条发展途径。

     
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