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首页> 外文期刊>Journal of Hazardous Materials >Degradation of 17α-methyltestosterone by Rhodococcus sp. and Nocardioides sp. isolated from a masculinizing pond of Nile tilapia fry
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Degradation of 17α-methyltestosterone by Rhodococcus sp. and Nocardioides sp. isolated from a masculinizing pond of Nile tilapia fry

机译：红球菌降解17α-甲基睾丸激素。和诺卡氏菌。从尼罗罗非鱼苗的男性化池塘中分离

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摘要

17α-Methyltestosterone (MT), a synthetic anabolic androgenic steroid, is widely used in aquafarming for the production of an all male fish population such as Nile tilapia. This study isolated, identified and characterized MT-degrading bacteria in the sediment and water from a masculinizing pond of Nile tilapia fry. Based on the phylogeny, physiological properties and cell morphology, the three isolated MT-degrading bacteria were related closely to Rhodococcus equi, Nocardioides aromaticivorans, and Nocardioides nitro-phenolicus. Growth of the three isolated strains was found to be inhibited for MT concentrations in the range of 1.0-10 mg/L The inhibition of cell growth was found to be modeled using the Haldane's substrate inhibition model. The kinetic constants ranged from 0.13 to 0.19 h~(-1) for μ_(max), 0.7-24.8 mg/L for Ks and 19.6-76.2 mg/L for K_I. Androgenic activity using β-galactosidase assay showed that all strains degraded MT to the products with no androgenic potency.
机译：17α-甲基睾丸激素（MT）是一种合成代谢的雄激素类固醇，被广泛用于水产养殖中，以生产所有雄性鱼类种群，如尼罗罗非鱼。这项研究分离，鉴定和表征了尼罗罗非鱼苗男性化池塘中沉积物和水中的MT降解细菌。根据系统发育，生理特性和细胞形态，三种分离的MT降解细菌与马红球菌，诺卡氏菌芳香果和诺卡氏菌硝基酚密切相关。发现三种分离菌株的生长在1.0-10 mg / L的MT浓度下受到抑制。发现细胞生长的抑制作用是使用Haldane的底物抑制模型建模的。对于μ_（max），动力学常数为0.13至0.19h〜（-1），对于Ks，动力学常数为0.7-24.8mg / L，对于K_I，动力学常数为19.6-76.2mg / L。使用β-半乳糖苷酶测定的雄激素活性表明，所有菌株均将MT降解为无雄激素效力的产物。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.35-44|共10页
  • 作者

    Supreeda Homklin; Say Kee Ong; Tawan Limpiyakorn;

  • 作者单位

    International Postgraduate Programs in Environmental Management. Graduate School, Chulalongkorn University, Bangkok, Thailand,Center of Excellence for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok, Thailand;

    Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA, USA;

    Center of Excellence for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok, Thailand,Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok Thailand,Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    17α-methyltestosterone; degradation; isolation; nocardioides; rhodococcus;

    机译：17α-甲基睾丸激素;降解;隔离;诺卡达尼红球菌;

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