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时间:2020-06-06
《锰抗性微生物的筛选鉴定及其对Mn~(2+)的吸附.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、西北虐业亏掘2013,22(7):193l99ActaAgriculturaeBorealioccidentalisSinica锰抗性微生物的筛选鉴定及其对Mn2+的吸附王燕,何峰。,尤健健,陈坤。,徐冰沁。,林雁冰。(1.杨凌职业技术学院,陕西杨凌712100;2.西北农林科技大学生命科学学院,陕西杨凌7121003.西北农林科技大学创新学院,陕西杨凌712100)摘要采用平板分离法从陕西南宝锰矿尾矿土样中分离的放线菌中筛选出一株高效抗锰菌株NB7,抗锰最高质量浓度达40mg/I。通过形态和16SrRNA基因序列分析对该菌株进行
2、鉴定,并综合运用单因素和正交试验对该菌株吸附锰的条件进行优化。结果表明,菌株NB-7为刺疣链霉菌(Streptomycspinoverrucosus)。初始pH、接种量、初始锰离子质量浓度及吸附时间对锰离子的生物吸附有较显著影响,而吸附温度基本无影响。各因素对吸附率的影响表现为接种量>初始锰离子质量浓度>初始pH>吸附时间;正交试验最终确定菌株NB-7吸附锰离子的最佳条件为:初始pH为4,接种量4.0,吸附时间30rain,初始锰离子质量浓度20mg/I。菌株NB-7在最佳条件下对锰离子的生物吸附具有较好的重复性和稳定性,最高吸附
3、量在85左右。关键词刺疣链霉菌;锰;吸附;单因素;正交中图分类号x172文献标志码A文章编号1004—1389(2013)07019307ScreeningandIdentificationofaManganese—resistantStrainandItsManganeseBiosorptionConditionsWANGYan,HEFeng,YOUJianjian。,CHENKun。,XUBingqin。andLINYanbing(1.YanglingVocational~>TechnicalCollege,YanglingS
4、haanxi712100,China;2.CollegeofLifeSciences,NorthwestA&FUniversity,YanglingShaanxi712100,China;3.InnovationExperimentalCollege,NorthwestAg=FUniversity,YanglingShaanxi712100,China)AbstractStrainNB~7wasisolatedfromsoilsampleswhichwerecollectedfromanelectrolyticmanga—nese
5、processingfactoryofShaanxiNanbaoManganeseIndustry.ThestrainNB一7wasresistanttothemaximumMn抖massconcentration40mg/L.Morphologicaland16SrRNAgenesequencewereusedforidentification.StrainNB一7wasidentifiedasStreptomyces5户0PrrMcos“s.Bothsinglefactorandorthogonalexperimentswer
6、edesignedtodeterminetheoptimumconditionsformanganesebiosorp—tion.Theresultshowedthatinoculationdose,initialpH,initialMn。。massconcentrationandadsorp—tiontimehadsignificantimpactsonthebiosorptionprocesswhiletemperatureshowedlittleinfluence.Theeffectofsinglefactorordersh
7、owedinoculationdose>initialMnmassconcentration>initialpH~adsorptiontime.TheoptimumconditionsformanganesebiosorptionwereinitialpH4,inocula—tiondose4.0,adsorptiontime30min,initialMnmassconcentration2Omg/L.Thestraingrewwellwithgoodrepeatabilityandstabilityundertheoptimum
8、conditions,andthemaximumbiosorptioncapacityofNB一7undertheexperimentalconditionsreachedmorethan85.Thisresearch1aidthefoundati
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