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背景近年来骨化醇类化合物(活性维生素D及其类似物)在肿瘤治疗、免疫调节中的作用逐渐被发现，药用价值显著，但目前化学合成法制备困难，因此高效制备骨化醇类化合物成为研究热点。 目的利用假诺卡氏菌( Pseudonocardia sp.)转化骨化醇类底物分子并提高转化率。 方法从化学合成方法常用的原料及中间体中筛选能被有效转化的底物分子，利用单因素及正交试验对转化条件进行优化。… (More)
The invention discloses a vehicle driving route determination method and device. The method comprises the steps that global positioning system GPS point information reported by the vehicle is… (More)
The utility model discloses a diesel generator set and power storage battery double-power hybrid alternating-current drive locomotive control system, which belongs to the field of locomotive control… (More)
We report scanning tunneling microscopy/spectroscopy(STM/STS) studies on iron-based superconductors of Ba1-xKx Fe2As2 and nearly optimally doped Fe(Te,Se). Mode-like features were observed… (More)
We have studied the angular magnetoresistance of iron pnictides BaFe2-xNixAs2, which shows clear 180 degree periodicity as fitted by a cosine function. In the x = 0.065 sample, the phase of the… (More)
A vertical and horizontal bidirectional band saw cutter for a slag-cement cystosepiment lath or building block comprises a horizontal frame and a vertical frame, wherein the horizontal frame is… (More)