为了简化PCR模板DNA的制备,选取4种实验材料,采用SDS一步法制备PCR模板.经PCR扩增,获得同常规方法制备的模板相近的实验结果.实现了"一管一步"制备模板DNA,从而开辟了一种快速、简易、低成本的PCR模板制备方法.
The structural properties and superconductivity of Mg1-xNaxB2 compounds are reported in this paper. Bulk samples X- ray diffraction (XRD) results indicate that the samples crystallize in a hexagonal structure. Due to the chemical activity of Mg powders, a sample amount of MgO impurity phase is detected by X-ray diffraction. Magnetization measurement results indicate that the non- stoichiometry of MgB2 has no influence on the superconducting transition temperature and the transition temperature width. And the introduction of Na almost has no effect on the transition temperature.
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