期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Characterization of Fe(Ⅲ)-Reducing Enrichment Cultures and Isolation of Enterobacter sp. Nan-1 from the Deep-Sea Sediment, South China Sea
1
作者 WANG Dunfan JIN Chong +1 位作者 JIN Aimin LOU Zhanghua 《Journal of Ocean University of China》 SCIE CAS CSCD 2020年第4期818-826,共9页
To characterize the Fe(III)-reducing bacteria,enrichment cultures were initiated by inoculating deep-sea sediment from the South China Sea(SCS)into the media with hydrous ferric oxide(HFO)as the sole electron acceptor... To characterize the Fe(III)-reducing bacteria,enrichment cultures were initiated by inoculating deep-sea sediment from the South China Sea(SCS)into the media with hydrous ferric oxide(HFO)as the sole electron acceptor.As indicated by Meta 16S rDNA Amplicon Sequencing,the microorganisms related to Fe(III)-reduction in the enrichment cultures were mainly Shewanella and Enterobacter.A new facultative Fe(III)-reducing bacterium was obtained and identified as Enterobacter sp.Nan-1 based on its 16S rRNA gene sequence and physiological characterizations.Enterobacter sp.Nan-1 was not only a mesophilic bacterium capable of reducing HFO with a wide range of salinity(4,34,40,50 and 60 g L−1)efficiently,but also a piezotolerant bacterium that can proceed Fe(III)-reduction sustainedly at hydrostatic pressures between 0.1 and 50 MPa using glucose and pyruvate as carbon source.Furthermore,the geochemical characteristics of deep-sea sediment indicated that the microbial metabolism and iron reduction both remain active in the well-developed Fe(III)-reducing zone where the strain Nan-1 was obtained.To our knowledge,Enterobacter sp.Nan-1 could serve as a new applicative Fe(III)-reducing bacterium for future investigation on the iron biogeochemical cycle and diagenetic process of organic matter in the deep-sea environment. 展开更多
关键词 deep-sea sediment Fe(Ⅲ)-reducing bacteria Meta 16S rDNA Amplicon Sequencing high hydrostatic pressures enterobacter sp.Nan-1
下载PDF
Unveiling the performance of a novel alkalizing bacterium Enterobacter sp.LYX-2 in immobilization of available Cd
2
作者 Yixin Luo Min Liao +3 位作者 Xiongxiong Lu Na Xu Xiaomei Xie Weiming Gao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第3期245-257,共13页
A novel alkalizing strain Enterobacter sp.LYX-2 that could resist 400 mg/L Cd was isolated from Cd-contaminated soil,which immobilized 96.05%Cd^(2+)from medium.Cd distribution analysis demonstrated that more than half... A novel alkalizing strain Enterobacter sp.LYX-2 that could resist 400 mg/L Cd was isolated from Cd-contaminated soil,which immobilized 96.05%Cd^(2+)from medium.Cd distribution analysis demonstrated that more than half of the Cd^(2+)was converted into extracellular precipitated Cd through mobilization of the alkali-producing mechanism by the strain LYX-2,achieving the high immobilization efficiency of Cd^(2+).Biosorption experiments revealed that strain LYX-2 had superior biosorption capacity of 48.28 mg/g for Cd.Pot experiments with Brassica rapa L.were performed with and without strain LYX-2.Compared to control,15.92%bioavailable Cd was converted to non-bioavailable Cd and Cd content in aboveground vegetables was decreased by 37.10%with addition of strain LYX-2.Available Cd was mainly immobilized through extracellular precipitation,cell-surface biosorption and intracellular accumulation of strain LYX-2,which was investigated through Cd distribution,Scanning Electron Microscope and Energy-Dispersive X-ray Spectroscopy(SEM-EDS),Fourier Transform Infrared Spectroscopy(FT-IR),X-ray Photoelectron Spectroscopy(XPS)and Transmission Electron Microscopy(TEM)analysis.In addition,the application of strain LYX-2 significantly promoted the growth of vegetables about 2.4-fold.Above results indicated that highly Cd-resistant alkalizing strain LYX-2,as a novel microbial passivator,had excellent ability and reuse value to achieve the remediation of Cd-contaminated soil coupled with safe production of vegetables simultaneously. 展开更多
关键词 CADMIUM enterobacter sp.LYX-2 Cd Immobilization Microbial passivator
原文传递
Vigna radiata var. GM4 Plant Growth Enhancement and Root Colonization by a Multi-Metal-Resistant Plant Growth-Promoting Bacterium Enterobacter sp. C1D in Cr(VI)-Amended Soils 被引量:1
3
作者 Gangavarapu SUBRAHMANYAM Rakesh Kumar SHARMA +1 位作者 Gattupalli Naresh KUMAR Gattupalli ARCHANA 《Pedosphere》 SCIE CAS CSCD 2018年第1期144-156,共13页
Contamination of agricultural soils by heavy metals has become a major concern due to their toxic effects on plant growth,symbiosis and consequently the yields of crops. In the present study, to enhance plant growth i... Contamination of agricultural soils by heavy metals has become a major concern due to their toxic effects on plant growth,symbiosis and consequently the yields of crops. In the present study, to enhance plant growth in Cr(VI)-amended soils, novel metalresistant plant growth-promoting bacteria(PGPB) were isolated from a soil contaminated with industrial waste effluent. One of the bacterial isolates, identified as Enterobacter sp. C1 D by 16 S r RNA gene sequencing, was found to be multi-metal resistant in nature with excellent plant growth-promoting(PGP) traits. Mung bean(Vigna radiata var. GM4) inoculation with Enterobacter sp.C1 D significantly(P &lt; 0.01) increased root and shoot length, shoot and root weight, and chlorophyll content in a range of Cr(VI)treatments. Plant tolerance towards Cr(VI) measured as effective concentration showed higher values with Enterobacter sp. C1 Dtreated plants compared to un-inoculated plants. Root colonization study was also carried out using green fluorescence protein-labeled Enterobacter sp. C1 D under a hydroponic system. Confocal laser scanning microscopy of the plant roots showed heavy bacterial loads on the surface of the plant root specifically at the root tip and the point of root hair/lateral root formation. The results of PGP traits showed that elevated indole acetic acid levels and 1-aminocyclopropane-1-carboxylate deaminase activity enabled Enterobacter sp. C1 D to enhance V. radiata growth in Cr(VI)-amended soils, whereby it significantly increased plant tolerance towards elevated Cr(VI) concentrations. 展开更多
关键词 chromium(VI) enterobacter sp C1D heavy metal metal toxicity plant tolerance
原文传递
菌株Enterobacter sp. L6异化Fe(Ⅲ)还原及Cr(Ⅵ)还原的性质分析
4
作者 王珊 刘淼 刘洪艳 《海洋环境科学》 CAS CSCD 北大核心 2020年第6期838-843,共6页
Cr(Ⅵ)是一种毒性极强的重金属,利用微生物还原Cr(Ⅵ)为Cr(Ⅲ)是解决Cr(Ⅵ)污染的一条有效途径。菌株Enterobacter sp. L6是一株分离自海洋沉积物中的异化铁还原细菌。接种时细胞密度A600为(0.25±0.03),培养12 h,A600达到(1.04... Cr(Ⅵ)是一种毒性极强的重金属,利用微生物还原Cr(Ⅵ)为Cr(Ⅲ)是解决Cr(Ⅵ)污染的一条有效途径。菌株Enterobacter sp. L6是一株分离自海洋沉积物中的异化铁还原细菌。接种时细胞密度A600为(0.25±0.03),培养12 h,A600达到(1.04±0.05),累积产生Fe(Ⅱ)浓度为(0.80±0.03)mmol/L;随着培养时间的延长,细胞密度A600和累积产生Fe(Ⅱ)浓度开始下降;培养36 h时,细胞密度A600为(0.81±0.04),累积Fe(Ⅱ)浓度(0.63±0.01)mmol/L。在厌氧培养过程中,菌株L6细胞生长与异化还原Fe(Ⅲ)性质存在明显的偶联关系。利用菌株L6的异化铁还原性质还原Cr(Ⅵ)的实验结果表明,在Cr(Ⅵ)浓度0~24 mg/L范围内,异化铁还原细菌L6都能进行细胞生长并还原Cr(Ⅵ)。Cr(Ⅵ)浓度为4、8和12 mg/L时,菌株L6对Cr(Ⅵ)还原率可达到100%,当Cr(Ⅵ)浓度为16 mg/L时,Cr(Ⅵ)还原率是参比[未添加Fe(Ⅲ)]的2.11倍。Cr(Ⅵ)浓度为20、24 mg/L时,仍能够还原Cr(Ⅵ)。以Fe(Ⅲ)为电子受体的异化铁还原细菌能明显提高Cr(Ⅵ)还原率,这为利用微生物修复Cr(Ⅵ)污染提供实验数据支持。 展开更多
关键词 异化铁还原细菌 菌株enterobacter sp.L6 Fe(Ⅲ)还原 Cr(Ⅵ)还原
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部