Green synthesis,characterization and physiological stability of gold nanoparticles from Stachys lavandulifolia Vahl extract

The synthesis of nontoxic stable gold nanoparticles is important for medical applications.An aqueous extract of the plant Stachys lavandulifolia Vahl was used to synthesize gold nanoparticles.This green method involved the S.lavandulifolia Vahl extract acting as a reducing and stabilizing agent.The nanoparticles were characterized by transmission electron microscopy,dynamic light scattering analysis and UV-vis absorption and Fourier transform-infrared spectroscopies.Stability under physiological conditions is important for medical applications.The stability of the nanoparticles was compared with that of conventional citrate-capped nanoparticles,under both synthetic and physiological conditions.The nanoparticles synthesized from the S.lavandulifolia Vahl extract were stable under physiological conditions,in contrast with conventional citrate-capped nanoparticles.     

双格半群

本文给出格半群上对偶同构、双格半群、ST-格半群等概念,讨论了格上半群构成格群的几组充要条件,从而解决了格在什么情况下具有格群结构这一至今未解决的问题.同时研究了ST-格半群等的一些性质、指出格群类是双格半群类的一个真子类.     

置换模,ρ置换模与Conlon比析

本文对特征P的基域F引入适当的Galois群T,讨论p置换模的Green环的Conlon比析在Galois群T作用下的动态,证明了在T作用下p置换模的Green环的不动点集重合于置换模的Green环。     

德摩根一致代数的度量化

我们给出了德摩根一致代数可伪度量化的一个充分必要条件。     

GREEN’S FUNCTION AND EFFECTIVE ELASTIC STIFFNESS TENSOR FOR ARBITRARY AGGREGATES OF CUBIC CRYSTALS

A closed but approximate formula of Green’s function for an arbitrary aggregate of cubic crystallites is given to derive the e?ective elastic sti?ness tensor of the polycrystal. This formula, which includes three elastic constants of single cubic c…     

高中新教材中函数概念教学思考

1问题的存在与思考根据过去掌握的教学情况,为了贯彻新教材的基本理念及其对“函数”的教学要求,我抽样调查了高二、高三学生对函数概念的认识及把握情况,结果始料不及:不仅高二,就连高三学生对函数的定义实质大多模糊不清,对于x、y的对应关系,对于问题“y=±2x是否函数”及判断方程y2=4x的曲线是否函数的图像,有过半的学生或答错或不置可否.对简单应用题“求用一条长1米的铁丝折成的矩形的最大面积”,解出率不足70%.函数是中学数学的主要内容之一,函数思想作为基本的数学思想,贯穿于中学数学教学的始终.那么,我们应该怎样从函数概念的重要…     

Green公式和代数的遗传性

设Λ是有限域k上的有限维代数, 证明了在molΛ中Green公式成立当且仅当Λ是遗传代数.     

一类退化型Schrodinger方程解的连续性

该文通过一种基本的分析方法,得到了一类退化型Schrodinger方程解的连续性结果,方程的类型为:Lu+vu=(f_i)_{x_i},其中L为一退化椭圆算子,v属于某一Kato类的类比,而f_i 属于某一加权L^p空间.