left-hand propeller,left-handed propeller是什么意思

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This thread combined laevogyrate thread and dextral thread together in the same part of the thread.

发明了一种新型螺纹—唐氏螺纹，这种螺纹采用的是变截面非完整螺纹，并且将左旋和右旋螺旋线复合 在同一段螺旋线上，具有左、右放螺纹的特点，可分别与左、右旋螺纹配合。

Optical Purity Analysis of Levodopa Drug by Capillary Electrophoresis;

毛细管电泳法测定左旋多巴药片的光学纯度

Preparation and the influencing factors of Levodopa Liposomes;

左旋多巴脂质体的制备及影响因素

Study on the Determination of Levodopa by Flow-Injection Electrogenerated Chemiluminescence;

流动注射电化学发光分析法测定左旋多巴的研究

A kind of biodegradable material poly (L-lactic acid)-polyethylene glycol (L-PLEG) was synthesized directly via melt polycondensation process with taking L-lactic acid (L-LA) and polyethylene glycol (PEG) having number average relative molecular mass (M_n) 1000 as raw materials.

直接以左旋乳酸(L-LA)单体和数均分子量为1000的聚乙二醇(PEG)为原料,通过直接熔融共聚法,合成了聚乳酸-聚乙二醇(L-PLEG)适宜的工艺条件为：以SnO为催化剂[m(SnO)/m(L-LA)为0。

Electrochemical and Spectrometric Studies on the Catalytic Effect of Aluminum on the Oxidation of Dopamine and L-Dopa;

铝对多巴胺和左旋多巴氧化的化学催化作用的电化学和光谱学研究

Studies on the Synthesis of Schiff Bases of L-DOPA;

左旋多巴胺希夫碱的合成研究

Optimization of L-DOPA synthesis by recombinant E.coli;

重组大肠杆菌合成左旋多巴条件的优化