微生物还原浸出法回收废旧电池粉末中的金属锰

驯化培养K1、K2、K33株锰还原异养微生物,使微生物耐受电池重金属离子的能力提高。通过微生物的还原作用将二氧化锰还原成二价锰离子回收利用。微生物利用MnO2作为代谢呼吸链最终电子受体,传递氧化有机物产生的电子,还原溶浸锰于介质中。与其他菌株相比,K1菌株表现出很强的金属耐受性,最终浸出率可达93%。     

Effects of Cd and Zn on physiological and anatomical properties of hydroponically grown Brassica napus plants

Environmental Science and Pollution Research - Clarifying the connection between metal exposure and anatomical changes represents an important challenge for a better understanding of plant...     

Development of indirect competitive ELISA using egg yolk-derived immunoglobulin (IgY) for the detection of Gentamicin residues

Gentamicin (Gent) is an aminoglycoside antibiotic being used in livestock sector. Gent residues could cause some genetic disorders by nonsense mutations. This study aimed to develop IgY-based ELISA for the detection of Gent in animal products. Gent was conjugated with Bovine serum albumin (BSA) by carbodiimide method for further immunization in the laying chickens. PEG-6000 extraction method was employed to extract IgY from the egg yolk. The titer of anti-Gent-IgY attained the peak of 1:256,000 after the 5^th booster immunization. Checkerboard titration confirmed that, anti-Gent IgY in 1:2,000 dilution could give an Optical Density (OD) 1.0 at 2 µg mL^?1 of Gent-OVA coating concentration. IgY-based indirect competitive ELISA (Ic-ELISA) showed that, the IC₅₀ value of anti-Gent IgY was 2.69 ng mL^?1 and regression curve equation was y = ?16.27x + 56.97 (R² = 0.95, n = 3), confirming that, the detection limit (LOD, IC₁₀ value) was 0.01 ng mL^?1. Recoveries from fresh milk, pork and chicken samples were ranged from 69.82% to 94.32%, with relative standard deviation lower than 10.88%. Our results suggested that generated anti-Gent IgY antibodies can be used in routine screening analysis of Gent residues in food samples.     

矿井安全监控系统的管理

煤矿安全是近年来国家安全管理工作的重中之重,也是我国建立和谐社会必须要解决的问题之一.对此,国家投入了大量的人力物力来进行研究和科技攻关,以期能够对事故的发生机理和认识有所突破,从而能够有效地控制事故.其中,强调对矿井瓦斯等危险有害因素进行实时监控,及时发现其变化及其趋势,从而可以预先判断事故发生的可能性,达到提前预测事故、控制事故发生的目的.而国务院安全生产委员会也于2003年7月4日下发的《煤矿安全生产基本条件》第十条中规定:"高瓦斯、煤与瓦斯突出矿井应有瓦斯抽放措施,并装备安全监控系统",这也充分体现了国家在矿山安全管理方面对安全监控系统的重视.     

高层建筑火灾扑救的潜在危险及预防措施

摘要近30年来,商层建筑发展十分迅速,高层建筑火灾也随之开始频繁发生,在扑救火灾过程中,消防队员常常伤亡,就高层建筑灭火过程中的潜在危险进行分析并提出相应的预防措施。     

电除尘器的新技术及其展望

简要介绍并分析了电矩收尘、透镜式电除尘器、雾滴荷电等除尘理论以及电除尘器本体和供电控制方面的新技术,分析和展望了电除尘器的未来发展,可为我国电除尘器的研究开发和运行改造提供参考。     

Toxic effect of microcystin-LR on blood vessel development

Abstract

The effect of microcystin-LR (MC-LR) at 50–1000?nmol/L on blood vessel development of zebrafish embryos has been explored. Upon exposure 72-h-post-fertilization (hpf), the hatching rate was significantly reduced and malformation and fatality rates were increased in a dose-dependent manner. MC-LR induced cell cycle arrest in the G0/G1-phase and damaged DNA structure in a dose-dependent manner. In human umbilical vein endothelial cells (HUVECs), MC-LR led to decreased activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), and catalase (CAT) and increased lipid peroxidation. These findings indicated that MC-LR could cause oxidative DNA damage, which mediated cell cycle arrest and inhibited cell proliferation afterwards, and retarded the blood vessel development.     

A kinetic study of Mn(II) precipitation of leached aqueous solution from electrolytic manganese residues

Electrolytic manganese residue (EMR) is a type of solid waste discharged from the process that converts solid manganese carbonate of rhodochrosite into soluble Mn(II) and generates anode mud under electrolysis. The experimental material was a filtrate created by using distilled water as a dispersal agent for the EMR, followed by simple filtration. A calculated amount of sodium carbonate was added to recover the soluble Mn(II) via precipitation into manganese carbonate. Data showed that Mn concentration may be markedly decreased from 2069 to 36 mg/L, thereby reaching a recovery rate as high as 98%. Analysis demonstrated that precipitation of Mn(II) from a leached aqueous solution followed first-order kinetics. The findings indicate that the reaction rate constant decreased as temperature gradually rose and that its apparent activation energy E_a was ?10.48 kJ/mol.     

汉中市人居环境与满意度评价研究

文章从对城市人居环境概念的剖析入手,制订了其评价指标体系。并以此通过问卷调查的形式,运用数学统计分析的方法,定量地研究了汉中市人居环境满意度,其结果表明居民一般满意汉中市的人居环境。最后为汉中市人居环境的发展提出了4点优化措施。     

The potential risk assessment for different arsenic species in the aquatic environment

The different toxicity characteristics of arsenic species result in discrepant ecological risk. The predicted no-effect concentrations (PNECs) 43.65, 250.18, and 2.00 × 10³ μg/L were calculated for As(III), As(V), and dimethylarsinic acid in aqueous phase, respectively. With these PNECs, the ecological risk from arsenic species in Pearl River Delta in China and Kwabrafo stream in Ghana was evaluated. It was found that the risk from As(III) and As(V) in the samples from Pearl River Delta was low, while much high in Kwabrafo stream. This study implies that ecological risk of arsenic should be evaluated basing on its species.