Biochemistry: a cadmium enzyme from a marine diatom

The ocean biota contains a vast reservoir of genomic diversity. Here we present the sequence and preliminary characterization of a protein that is a cadmium-containing carbonic anhydrase from the marine diatom Thalassiosira weissflogii. The existence of a cadmium enzyme in marine phytoplankton may indicate that there is a unique selection pressure for metalloenzymes in the marine environment, and our discovery provides a long-awaited explanation for the nutrient-like behaviour of cadmium in the oceans.     

Biochemistry: biosynthesis of an organofluorine molecule

Although fluorine in the form of fluoride minerals is the most abundant halogen in the Earth's crust, only 12 naturally occurring organofluorine compounds have so far been found, and how these are biosynthesized remains a mystery. Here we describe an enzymatic reaction that occurs in the bacterium Streptomyces cattleya and which catalyses the conversion of fluoride ion and S-adenosylmethionine (SAM) to 5'-fluoro-5'-deoxyfluoroadenosine (5'-FDA). To our knowledge, this is the first fluorinase enzyme to be identified, a discovery that opens up a new biotechnological opportunity for the preparation of organofluorine compounds.     

配合能力分析和配合能力指数

本文基于孔、轴尺寸和装配尺寸三个分布之间的关系提出一套配合能力指数,从而为由已知孔、轴配合零件批的统计参数预测和控制配合性质和装配质量提供一个评价尺度。基于配合能力和工序能力分析所发展的应用方法为以较低的制造成本实现较高的装配精度提供了一种新的精益生产模式的选择。     

生化数值分析系统

本文主要介绍了可在Apple及其兼客机上运行的,能够对生化数值进行存贮管理及统计分析的软件系统。     

员工-组织匹配对员工士气的影响：员工-工作匹配的中介作用

为探讨人与组织匹配对员工士气的影响机制,采用问卷调查法调查了50个工作团队共532名员工。结果发现:(1)员工组织匹配(P-O匹配)和员工-工作匹配(P-J匹配)可以对员工组织认同、工作投入和满意度进行预测;(2)P-O匹配不仅可以直接对员工的组织认同、满意度、工作投入产生影响,还可以通过P-J匹配的中介作用来对他们产生间接影响,其中,P-J匹配在P-O匹配对员工组织认同的影响中存在完全中介效应,在P-O匹配对员工满意度、工作投入的影响中起部分中介作用。因此,能够影响员工士气和行为的最直接和最深远的因素是P-O匹配。在管理实践中,企业管理者应理清P-O匹配和P-J匹配之间的关系和重要性,并认为员工与组织的匹配问题应成为人力资源管理人员最为关注的问题,与此同时应注重员工素质与工作需求之间的匹配,这些都会影响到员工的工作态度与行为,进而影响组织绩效。