Spatio-temporal evolution of post-seismic landslides and debris flows: 2017 Ms 7.0 Jiuzhaigou earthquake

Environmental Science and Pollution Research - Spatio-temporal evolution of post-seismic landslides and debris flows provides a new perspective to understand post-earthquake evolution of geological...     

Bacterial abundance and community structure in response to nutrients and photodegraded terrestrial humic acids in a eutrophic lake

The exposure of humic substances to solar radiation can alter their concentration and composition and subsequently influences their bioavailability in aquatic food webs. With eutrophication increasingly prominent in lakes, nutrients, such as inorganic N and P, are a prerequisite for heterotrophic bacteria that use organic matter. Here photodegradation of terrestrial humic acids and nutrient addition were performed to investigate the response of bacterial abundance and community structure to photodegraded humic acids and increased nutrient concentrations in a eutrophic lake. Results showed that the decreasing level of absorption coefficient at 460 nm in the treatment irradiated with 40 W UV lamps was more remarkable than that of the treatment irradiated with 20 W UV lamps and the control. This reduced coefficient corresponds to the greatest decrease in humic acid concentration in the 40 W group. Bacteria showed high abundance after incubation with humic acids which underwent strong irradiation intensity. An increased nutrient concentration significantly affected bacterial abundance. The dominant bacteria were Aquabacterium for the irradiated group, Aquabacterium and Limnobacter for the 20 W group and Flavobacterium and Limnobacter for the 40 W group. Armatimonadetes-gp4 and Sediminibacterium showed evident response to high nutrient concentration. Our results showed that the exposure of terrestrial humic acids to UV light and the increasing concentration of nutrients have obviously changed bacterial community.

     

Respiratory exposure to PM2.5 soluble extract induced chronic lung injury by disturbing the phagocytosis function of macrophage

Environmental Science and Pollution Research - Exposure to airborne urban particles is a contributing factor for the development of multiple types of respiratory diseases; its pathological role as...     

Association of urinary or blood heavy metals and mortality from all causes,cardiovascular disease,and cancer in the general population: a systematic review and meta-analysis of cohort studies

Environmental Science and Pollution Research - Amounting epidemiological evidence has shown detrimental effects of heavy metals on a wide range of diseases. However, the effect of heavy metal...     

Prenatal exposure to air pollution and the risk of eczema in childhood: a systematic review and meta-analysis

Environmental Science and Pollution Research - An increasing number of studies investigated the association between air pollution during pregnancy and the risk of eczema in offspring. However, no...     

Effect of applying persulfate on the accumulation of arsenic in rice plants grown in arsenic-contaminated paddy soil

Environmental Science and Pollution Research - Arsenic is known to be a notorious human carcinogen and rice consumption is becoming the primary human exposure route for As, especially in many Asian...     

基于地理探测器的镇域尺度土壤重金属含量空间分异及其影响因素分析

为揭示镇域尺度规模土壤重金属含量的空间分异及其影响因素,以成都平原腹心地带某镇为研究区域,采集788份表层土壤样品,利用地累积指数法对土壤Cd、Hg、As、Cu、Pb、Cr、Zn和Ni的污染进行评价,基于地理探测器,以土壤性质、地形和距离等15种因子为自变量,各重金属含量为因变量,探析土壤重金属含量的空间分异及其影响因素.结果表明,研究区土壤Hg、As、Pb、Cr、Cu、Ni和Zn含量平均值是成都市土壤背景值的1.06~1.93倍,Cd含量低于背景值;除Hg呈现轻度污染外,其余7种重金属处于清洁状态.8种重金属空间分布存在显著差异,且各重金属间存在显著相关性,并与土壤性质存在显著相关性.因子探测发现,总磷（TP）、总钾（TK）、pH、总有机碳（TOC）、高程和距铁路距离对8种重金属含量的解释力最显著.交互作用探测发现,土壤性质与其他因子交互作用是重金属空间分异的最主要影响因素,高程、距住宅区距离、距铁路距离和距工业用地距离也是重要影响因子.风险探测发现,Hg在高程和距铁路距离的子区域的差异最显著,其余7种重金属在土壤性质影响因子子区域的差异最显著.镇域尺度规模土壤重金属的空间分布差异显著,这与研究区的土壤性质、地形和人类活动密切相关.     

活性污泥中水解酶的研究进展

水解酶由活性污泥中的微生物产生,它们普遍存在于各种生物处理系统中,并对大分子有机物的生物降解起到关键性的作用。综述了水解酶在活性污泥中的分布特性、酶活力的测定方法、影响酶活力的因素等几个方面的最新研究进展。     

金属填料塔火灾事故及预防

阐述了金属填料着火的原因、预防金属填料着火的措施以及应急反应的注意事项.     

2-chlorophenol induced ROS generation in fish Carassius auratus based on the EPR method

In the present study, a secondary spin trapping technique was used followed by electron paramagnetic resonance (EPR) analysis, to study the potential of reactive oxygen species (ROS) production after fish (Carassius auratus) were injected i.p. with different doses (50, 100, 200, 250, 500mgkg(-1)) of 2-chlorophenol (2-CP). The ROS signal intensity of the EPR spectrum showed a significant increase (p<0.05, compared with the control) when the 2-CP dose was as low as 50mgkg(-1). There is a good relationship between the 2-CP administered doses and ROS generation. Based on the hyperfine splitting constants and shape of the EPR spectrum, the ROS which was generated in fish liver after intraperitoneal (i.p.) injection of 2-CP was identified as ()OH. SOD and CAT activities were found to be induced at lower doses of 2-CP. GSH levels fell below the control level following all treatments with 2-CP, and GSSG levels changed along with those of GSH. These observations indicated that the fish experienced oxidative stress. The strong positive correlation (r=0.966, p<0.005) between ()OH radical and lipid peroxidation suggested that lipid peroxidation was possibly induced by ()OH. The phase II detoxification enzyme glutathione-S-transferase (GST) may play an important role in 2-CP metabolism or excretion and, consequently, reduce ROS production. This study provides strong evidence that level of ROS is significantly increased in 2-CP stressed fish, and ROS may serve as a potential biomarker to indicate 2-CP contamination.