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草甘膦降解菌筛选、鉴定及其降解酶酶学
吴学华
关键词:草甘膦降解特性
草甘膦降解菌A-F02的分离·鉴定及降解特性研究被引量:5
2010年
[目的]筛选高效草甘膦降解菌株,并研究其降解特性。[方法]从草甘膦生产厂的曝气池活性污泥中分离到1株高效草甘膦降解真菌A-F02,并根据菌株形态特征和核糖体内源转录间隔区(ITS)全序列分析进行菌株鉴定。同时研究菌株对草甘膦的降解特性和影响因素。[结果]经鉴定,菌株A-F02为米曲霉属。在基础盐培养基中,以草甘膦(1000mg/L)为唯一碳源,30℃、150r/min培养7d,草甘膦降解率为86.82%。通过研究添加葡萄糖量、初始pH值、温度及草甘膦浓度对米曲霉A-F02降解能力和生物量的影响结果表明,在添加葡萄糖浓度0.5%,初始pH值7.5,温度30℃,草甘膦浓度1500mg/L的条件下,菌株A-F02的生长量最大,草甘膦的降解效果最佳。[结论]该研究可为草甘膦降解酶的分离纯化提供试验基础。
吴学华付桂明万茵郭德斌陈勇辉罗阳帆吴晓芳
关键词:草甘膦生物降解率生物量
Isolation and Identification of Glyphosate-degraded Strain Aspergillus oryzae sp.A-F02 and Its Degradation Characteristics被引量:2
2010年
[Objective] The research aimed to isolate the glyphosate-degraded strain and study its degradation characteristics.[Method] A glyphosate-degraded fungal strain A-F02 was isolated from sludge in an aeration tank of a glyphosate manufacture.The fungal strain A-F02 was identified according to morphological characteristics and internal transcribed spacer(ITS)region of nuclear ribosomal DNA sequence analysis.The glyphosate-biodegraded characteristics of strain A-F02 and the influencing factors were studied.[Result] The fungal strain A-F02 was identified as Aspergillus oryzae sp..The glyphosate-biodegraded rate was 86.82% in the mineral salt medium with 1 000 mg/L of glyphosate as the sole source of carbon,after being incubated at 30 ℃ and 150 rpm for 7 d.The biodegradation rates and biomass of the A-F02 were the highest under the culture conditions with glucose(0.5%,w/v),pH 7.5,30 ℃ and glyphosate(1 500 mg/L).[Conclusion] The research provided the experimental basis for glyphosate-biodegraded enzyme purification.
吴学华付桂明万茵郭德斌陈勇辉罗阳帆吴晓芳
关键词:BIOMASS
响应面法优化复合菌种发酵棉粕工艺条件被引量:3
2010年
本文采用产脘假丝酵母(F-C01)和枯草芽孢杆菌(F-B01)对棉粕进行混合菌种固体发酵。单因素试验结果表明菌种比例(F-B01∶F-C01)、料水比、发酵温度对试验结果有显著性影响,根据响应面的基本原理,以游离棉酚脱毒率和发酵后小分子肽含量为优化指标,利用SAS软件对发酵条件进行优化,最佳发酵条件为:F-B01与F-C01菌种比例2∶1,料水比3∶1,发酵温度32℃,此条件下游离棉酚的脱毒率86.52%,小分子肽含量达13.12%。
郭德斌付桂明吴学华万茵陈勇辉罗阳帆房玉民
关键词:棉粕响应面法
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