建筑企业安全文化对安全绩效影响的实证研究

基于安全文化在建筑业安全管理中的重要性越来越突出,因此安全文化对于提高安全绩效,减少建筑业事故发生率的作用日益得到重视。文中进行实证研究,探讨建筑企业安全文化对安全绩效的影响。安全文化的维度为安全制度文化、安全物质文化和安全观念文化,研究结果表明,安全制度文化、安全物质文化和安全观念文化均有助于安全绩效提高,研究结果可在一定程度上促使建筑企业重视并自觉改善安全文化,有助于减少建筑业安全事故发生率,提升安全绩效。     

土壤中两种手性有机氯农药的选择性降解研究

为了更深入的了解和阐释手性有机氯农药在土壤中的转化和环境归趋,采用实验室室内避光培养方法,研究了o,p＇-DDT及o,p＇-DDD 2种手性有机氯农药的外消旋体在水稻土厌氧培养体系和菜园土好氧培养体系中的选择性降解情况。为了更好的利用土壤中土著微生物的活性,我们选择了厌氧微生物比较丰富的水稻土和好氧微生物丰度比较高的菜园土来做培养实验。结果表明实验体系中o,p＇-DDT及o,p＇-DDD在水稻土和菜园土中的降解均没有明显的对映体选择性。这一结果与2种手性化合物不同对映体在自然环境中的含量普遍具有差异性有所不同,说明野外环境条件和室内模拟实验条件的差异会影响手性化合物的降解选择性。在2种体系中,o,p＇-DDT的降解速率均高于o,p＇-DDD的降解速率。这与以前的研究报道一致,DDD比DDT更难降解。通过2个体系的比较,发现DDT的降解速率在厌氧体系中高于好氧体系,而DDD的降解速率与之相反,好氧体系高于厌氧体系。这应该与DDT和DDD 2种化合物的化学结构及2种土壤中微生物群落的差异有关。对于厌氧体系中的2种水稻土,采自中山的水稻土中DDT的降解速率高于江门的水稻土,这应该与中山水稻土有机质含量高于江门的水稻土有关。有机质含量的高低直接反映了土壤中微生物的多少,进而会影响污染物的降解速率。研究发现本实验所用水稻土和菜园土总有机碳含量偏低可能是影响2种化合物的对映体无降解选择性的因素之一。此外,由于本研究采用缓冲溶液将pH 调控在中性,因此本文的土壤 pH 对降解选择性的影响仍有待进一步研究。本研究中好氧体系和厌氧体系对目标物的降解选择性无明显差异。     

Parsing organizational culture: How the norm for adaptability influences the relationship between culture consensus and financial performance in high‐technology firms

The relationship between organizational culture and financial performance remains elusive even though researchers have studied it for some time. Early research suggested that a strong culture that aligns members' behavior with organizational objectives boosts financial performance. A more recent view is that, because strong cultures promote adherence to routines and behavioral uniformity, they are less effective in dynamic environments. We suggest that the relationship between culture and performance can be reconciled by recognizing that culture encompasses three components: (1) the content of norms (norm content); (2) how widely members agree about norms (culture consensus); and (3) how intensely organizational members hold particular norms (norm intensity). We hypothesize that “strong cultures”—where a high consensus exists among members across a broad set of culture norms—can contribute to better financial performance even in dynamic environments if norm content intensely emphasizes adaptability. We test this hypothesis in a sample of large firms in the high‐technology industry. Firms characterized by higher culture consensus and intensity about adaptability performed better three years later than did those characterized by lower consensus, lower intensity about adaptability, or both. We discuss how parsing culture into content, consensus, and intensity advances theoretical and empirical understanding of the culture–performance relationship. Copyright © 2014 John Wiley & Sons, Ltd.     

企业安全文化的结构层次初探

介绍了企业安全文化的概念,探讨了企业安全文化在企业安全管理中的重要地位,提出了企业安全文化的层次结构模型。     

Effects of arsenic on reactive oxygen species and antioxidant defense system in tomato plants

In this study, the generation of reactive oxygen species, the induction of oxidative stress, and the response of the antioxidative system in hydroponically grown tomato plants as the cause of arsenic-induced phytotoxicity are investigated. Reduction in plant growth was measured in terms of dry weight and length of roots and shoots, the latter accumulating more arsenic than the roots. The treatment resulted in increased formation of superoxide anion (O₂^.?), H₂O₂, and thiobarbituric acid reactive substances, which indicate augmented lipid peroxidation. Superoxide dismutase, catalase (CAT), and ascorbate peroxidase activities were increased in arsenic-treated tomato plants while CAT activity was insignificantly increased.     

The use of the embryo‐culture techniques in the research on the Teratogenic and Mutagenic properties of metals†

Actually, embryos can be cultured from the one‐cell stage up to the blastocyst stage, and their development can be easily monitored at any time: severe effects caused by toxic compounds are traduced by rapid embryonic death, less pronounced effects can be expressed by a lowered cleavage activity or by an arrest of the development from a particular stage. The system can be improved by transferring the embryos at the blastocyst stage in another more complete medium where they can “implant”; and form an inner cell mass with differentiated ectoderm and endoderm. Since last years, it has also become possible to culture postimplantation rodent embryos for short periods involving a number of particularly critical stages of organogenesis, such as the formation and closure of the anterior neuropore. Embryo‐culture also represents a useful system to study cytogenetic effects of chemicals which are often linked to lethal or teratogenic effects. These different possibilities are illustrated by examples of studies already performed with metals, and dealing with their teratogenic and/or cytogenetic effects on pre‐ and postimplantation rodents.     

Genetic toxicology of metal compounds: An examination of appropriate cellular models †

Bacterial systems have not had success predicting metal carcinogenicity. Hypotheses explaining this failure are examined. Using a broad genetic endpoint, λ prophage induction, under sub‐toxic growing conditions, genotoxicity is seen for compounds of chromium, manganese, lead, molybdenum and tungsten. Copper, manganese, arsenic and molybdenum compounds enhanced UV mutagenesis in E. coli WP2.

The toxicity of metal compounds to cultured mammalian cells correlates well with rat oral LD₅₀ values. Whereas insolubility can present problems in bacterial studies, concentrations of metal compounds toxic to mammalian cells can be determined even in the presence of precipitate, and sometimes [Pb(NO₃)₂, BaCl₂ and BeCl₂] occurs only in its presence. PbS and MnS, which are insoluble, are much more toxic than the more soluble compounds Pb(NO₃)₂ and MnCl₂. These results demonstrate the importance of cellular phagocytosis of insoluble metal compounds as a factor in studying the toxicity and genotoxicity of metal compounds.     

Oxidative and genotoxic effects of bisphenol A on primary gill cell culture of Lake Van Fish (Alburnus tarichi Güldenstädt, 1814)

Lake Van is the largest lake in Turkey. The lake limits lifespan due to its high pH and brackish water. For this reason, only a single species of fish (Van Fish) is living in the lake that has been adapted to these conditions. In the present study, we investigated the total oxidant status (TOS), total antioxidant status (TAS), malondialdehyde (MDA) level and DNA damage effect of bisphenol A (BPA) (10^?7, 10^?6 and 10^?5?M) on primary gill cell culture of Van Fish for 24 and 48?h of incubation periods. TAS levels were not changed when compared to those of the control group, but TOS levels were decreased in both 24 and 48?h. The MDA level increased only at the highest concentration (10^?5) at the end of 12 and 24?h (p?.05). DNA damage increased only at the 10^?5?M concentration after 48?h. At the end of the experiment, BPA exposure caused lipid peroxidation and genotoxic effect. These results indicate that high levels of BPA exposure induced oxidative stress and DNA damage by time- and concentration-dependent fashion in the gill cell culture of Van Fish. Gill cell culture is a useful model for the rapid identification of the harmful effects of chemicals in the aquatic environment.     

The role of Confucianism in South Korea's emergency management system

Numerous Western researchers have examined the influence of Confucianism on development in Asia, but almost no South Korean researchers have studied the topic in regard to emergency management in their own country. This study begins by considering Confucianism as a social culture. Next, it goes on to evaluate its role in South Korea's emergency management system, contributing, ultimately, to efficiencies in emergency management. Drawing on a literature review and a case study, the paper assesses the double‐ and single‐faced approaches, using four major Confucian components: destiny; family; ritual; and relation. The double‐faced approach includes the positive and negative aspects of emergency management, whereas the single‐faced approach incorporates only its positive aspects. This paper provides, for the first time, a systematic analysis of the relationship between Confucianism and emergency management in South Korea. Its key finding is that the double‐faced approach needs to be transformed into a single‐faced approach through active facilitation of behavioural change.     

高校安全文化建设现状及对策研究——以L大学为例

为了改善L大学安全状况,提高L大学安全文化建设水平,采用文献对比分析法研究高校安全文化定义及其理论实质,从狭义的角度提出高校安全文化是高校管理的一系列安全理念,具体化为32条高校安全文化核心元素。以L大学为研究样本,定性分析其安全文化建设内容;编制高校安全文化定量测量量表,对其安全文化建设水平进行定量测量。评价结果表明L大学安全文化建设存在缺欠,提出了实用性对策措施和建议。