塞拉利昂粘土的物理性质与无釉地砖耐压强度之间的线性回归分析

论述了从塞拉利昂不同地区采集的６个粘土试样的一些物理性能,这些物理性能与无釉烧结地砖的耐压强度有一定的关系。由相关系数可知,烧结温度是控制地砖强度的主要因素,虽然粘土的粒度分布与地砖强度之间无明显关系,但过多添加砂子会降低砖的强度,而适当的粘土和淤泥则提高砖的强度。高塑性有降低砖强度的作用,体积密度和气孔率对强度有相反的影响,前者能提高强度,而后者则会降低砖的强度。     

Generation of sodium hypochlorite (NaOCl) from sodium chloride solution using C/PbO2 and Pb/PbO2 electrodes

Two modified electrodes (Pb/PbO₂ and C/PbO₂) were prepared by electrodepositing a lead oxide layer on lead and carbon substrates. These modified electrodes were used as anodes for the generation of sodium hypochlorite (NaOCl) from sodium chloride solution. Different operating conditions and factors affecting the treatment process of NaOCl generation, including current density, pH values, conductive electrolytes, and electrolysis time, were studied and optimized. By comparison the C/PbO₂ electrode shows a higher efficiency than the Pb/PbO₂ electrode for the generation of NaOCl.     

对叔丁基杯〔8〕芳烃酯类衍生物的合成

由对叔丁基苯酚和甲醛在碱催化下以一步法合成了对叔丁基杯〔８〕芳烃．以酸酐和酰卤为酰基化试剂合成了相应的酯类衍生物．讨论了杯芳烃的分子结构与光谱性质的关系     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

Induction and effector functions of T(H)17 cells

T helper (T(H)) cells constitute an important arm of the adaptive immune system because they coordinate defence against specific pathogens, and their unique cytokines and effector functions mediate different types of tissue inflammation. The recently discovered T(H)17 cells, the third subset of effector T helper cells, have been the subject of intense research aimed at understanding their role in immunity and disease. Here we review emerging data suggesting that T(H)17 cells have an important role in host defence against specific pathogens and are potent inducers of autoimmunity and tissue inflammation. In addition, the differentiation factors responsible for their generation have revealed an interesting reciprocal relationship with regulatory T (T(reg)) cells, which prevent tissue inflammation and mediate self-tolerance.