简介:将节杆菌和芽孢杆菌分别暴露于不同浓度的铅溶液中,并进行不同暴露时间的急性毒性试验。结果表明,500mg/kg的Pb(II)处理会使节杆菌中的细胞膜脂质过氧化产物——硫代巴比妥酸活性物质(TBARS)浓度显著降低(p〈0.05),而Pb(II)质量比变化对其他指标无显著影响(p〈0.05);铅处理会使芽孢杆菌中可溶性蛋白质量浓度、GSH质量浓度和超氧化物歧化酶(SOD)活性显著升高,而过氧化氢酶(CAT)活性显著降低(p〈0.05)。节杆菌的可溶性糖质量浓度、GSH质量浓度、SOD活性和TBARS浓度随暴露时间延长而显著增加;芽孢杆菌的可溶性糖质量浓度、GSH质量浓度和SOD活性随暴露时间延长而显著增加,TBARS浓度随暴露时间延长呈先增后减的变化趋势,CAT活性也表现出先增后降的变化趋势。铅处理对节杆菌和芽孢杆菌具有一定的胁迫作用,两种菌通过启动不同的抗性系统来抵抗外界胁迫。
简介:Theobjectiveofthisstudywastoinvestigatetheef-fectsofearthwormdensityontheavailabilityofnutrientsandheavymetalsinmetalcontaminatedsoils.Pb/Znminetailingsweremixedthroughlywitharedyellowpodzolicsoilattheratio(w/w)of75:25.Earthworms(Pheretimasp.)wereintroducedtothemixtureatfourdifferentdensities,zero,three,sixandnineindividualsperpotplantedwithryegrass(Loliunmultiflorum).Theresultsindicatedthatearthwormactivitysignificantlyen-hancedryegrassshootbiomass.However,asdenserearthwormpopulationwasintroduced,shootbiomasstendedtodecrease.EarthwormactivitysignificantlyincreasedsoilpHandavailabilityofN,PandKinthetailingsandsoilmixture.TherewasageneraltendencythatuptakeofZnbyryegrassincreasedafterearthworminoculation,althoughtheincreaseinextractableZnintailingsandsoilmixturewasnotsignificant.Onthecontrary,thereseemedtobealoweruptakeofPbbyryegrassunderearthworminoclation,despitethefactthathigherextractablePbconcentrationswereobserved.Thepresentprojectindicatedthattheimprovedgrowthofryegrasswasduetoimprovednutrientavailabilityandothersoilconditions,byinoculationofearthwormsatanappropriaterate.Furtherstudiesareneededtoillustratetherelationshipbe-tweenmetalavailabilityandearthwormactivityinthefield.
简介:Thispaperisthefirstrecordedeconomicvalueoflivingfossil,anevaluationofthebasiceconomicvalueofLingula,basedonthedirectutilizationofhouseholdsforfoodandsale.Twenty-onelocalfishermenwhocollectedLingulainTratProvincewerefocusedonbyusinginterviewquestionnaires.Theanimalhabitatsareinfluencedbytheencroachers’age,genderandharvestmethod.Thetotaleconomicvaluein2011wasaroundtwomillionbaht.ThosewhopossessfishinggearandhavemoremoneycanhavegreateraccesstotheproductThelocalcommunitiesinNongKhunsongsub-districtaresuccessfulincollectingtheLingulaandindoinglocalbusiness.Themarketchannelanalysisisconductedatlocal,provincialandnationallevelsandshortmarketchainsaredemonstratedintheformofawholesalemarketintheLingulatrade.Thisrepresentssignificantconsumptionbythelocalcommunities.Thestudyfurtherrecommendssustainableconservationandmanagementeffortsatalocalscale.
简介:将节杆菌和芽孢杆菌分别暴露于不同质量比的镉溶液中,进行不同暴露时间的急性毒性试验。结果表明,20mg/kg的cd(II)处理会使节杆菌中还原型谷胱甘肽(GSH)质量浓度显著降低,细胞膜脂质过氧化产物——硫代巴比妥酸活性物质(TBARS)浓度显著升高;0.2mg/kg的cd(II)处理会使芽孢杆菌中GSH质量浓度、过氧化氢酶(CAT)活性显著降低。节杆菌的可溶性蛋白、可溶性糖质量浓度随暴露时间延长而减少,GSH质量浓度、CAT和超氧化物歧化酶(SOD)活性随暴露时间延长而增加,TBARS浓度呈先减后增的变化趋势;芽孢杆菌的可溶性蛋白质量浓度、CAT活性和TBARS浓度呈先增后减的变化趋势,可溶性糖、GSH质量浓度和SOD活性呈先减后增的变化趋势。镉处理对节杆菌和芽孢杆菌具有一定的胁迫作用,两种菌通过启动不同的抗性系统来抵抗外界胁迫。
简介:自农药厂废水中分离到一株广谱菊酯类杀虫剂降解菌JZL-3,经过形态、生理生化试验及16SrDNA序列分析,鉴定其属于节杆菌属(Arthrobactersp.)。该菌能降解目前市场上使用的7种主要菊酯类杀虫剂,降解速率山高到低为:氯菊酯、甲氘菊酯、氯氰菊酯、氰戊菊酯、联苯菊酯、功夫菊酯和溴氰菊酯。对氯氰菊酯的最适降解温度为30℃,最适pH值为7.0,初始接种量在一定范围内(1%~5%)与降解率呈正相天。菌株JZL-3对氯菊酯和氯氰菊酯顺反异构体的降解没有显著的差异,不同于已有的关于菊酯类杀虫剂生物降解具有显著立体异构选择性的结论。