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左旋多巴的合成与提取 总被引:8,自引:0,他引:8
左旋多巴 (L DOPA)是治疗帕金森病的有效药物。L DOPA的生产方法有化学合成、从植物中提取和微生酶物转化等 ,其中利用微生物的酪氨酸酚解酶以邻苯二酚、丙酮酸和氨为底物合成L DOPA被证明是一种最经济且最有前途的方法。应用基因工程技术构建高效菌株。左旋多巴的提取有多种方法 ,其中向反应体系中加入晶种使多巴从反应体系中析出 ,除去菌体和杂质 ,再进行重结晶可得到纯度较高的多巴是一种很好的方法。 相似文献
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David Chelmow 《The Yale journal of biology and medicine》1987,60(5):499-Oct;60(5):499
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脱落酸应答基因的表达调控及其与逆境胁迫的关系 总被引:1,自引:0,他引:1
本文对生长调节物质脱落酸应答基因的类型、结构和功能特征、表达调控的分子机理,以及近年来的热点问题:ABA在逆境胁迫反应中的作用机制,ABA应答基因与逆境胁迫的关系等作了较全面的综述。 相似文献
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《Plains anthropologist》2013,58(68):105-110
AbstractAn examination of the physical laws behind the function and performance of the atlatl-both with and without weights-is presented. The increased distance a dart can be thrown with the atlatl is a function of the increased mechanical advantage which the atlatl provides by increasing the length of the moment arm. The location of weight on an atlatl is shown to produce a performance less than or equal to that achieved without a weight. It is proposed, although unproven, that the addition of a weight to an atlatl acts as a stabilizing device to reduce side to side oscillations and thereby providing greater control. The penetration of a projectile thrown with an atlatl is greater than that of one thrown by hand and about equal to that of an arrow shot from a bow. 相似文献
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Gazzaniga MS 《Neuron》2008,60(3):412-415
Some of the implications for law of recent discoveries in neuroscience are considered in a new program established by the MacArthur Foundation. A group of neuroscientists, lawyers, philosophers, and jurists are examining issues in criminal law and, in particular, problems in responsibility and prediction and problems in legal decision making. 相似文献
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