{"title":"偶氮染料对硝化细菌利用亚硝酸盐氮的毒性影响","authors":"C. Ogugbue, N. Oranusi","doi":"10.4314/GJES.V4I1.2440","DOIUrl":null,"url":null,"abstract":"The toxicity of five azo dyes (toxicants) on Nitrobacter was investigated. The index for toxicity was inhibition of rate of nitrite-N utilization. The rate of nitrite-N utilization decreased with increase in concentration of each toxicant at specific exposure time. However, stimulation of utilization was obtained at low concentrations and short exposure time for two of the dyes. This was attributed to hyperactivity. The median effective concentration 50 (EC 50 ) values increased with increase in exposure time for each toxicant. This was attributed to acclimatization and/or detoxification. Inhibition was attributed to any/or all of the following factors: molecular size, impurities in the toxicants and dye content. KEY WORDS: Toxicity, Azo dyes, Nitrobacter, hyperactivity, acclimatization Global Journal of Environmental Sciences Vol.4(1) 2005: 47-51","PeriodicalId":12569,"journal":{"name":"Global Journal of Environmental Sciences","volume":"78 1","pages":"47-51"},"PeriodicalIF":0.0000,"publicationDate":"2005-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Toxic Effect Of Azo Dyes On Nitrite-N Utilization By Nitrobacter\",\"authors\":\"C. Ogugbue, N. Oranusi\",\"doi\":\"10.4314/GJES.V4I1.2440\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The toxicity of five azo dyes (toxicants) on Nitrobacter was investigated. The index for toxicity was inhibition of rate of nitrite-N utilization. The rate of nitrite-N utilization decreased with increase in concentration of each toxicant at specific exposure time. However, stimulation of utilization was obtained at low concentrations and short exposure time for two of the dyes. This was attributed to hyperactivity. The median effective concentration 50 (EC 50 ) values increased with increase in exposure time for each toxicant. This was attributed to acclimatization and/or detoxification. Inhibition was attributed to any/or all of the following factors: molecular size, impurities in the toxicants and dye content. KEY WORDS: Toxicity, Azo dyes, Nitrobacter, hyperactivity, acclimatization Global Journal of Environmental Sciences Vol.4(1) 2005: 47-51\",\"PeriodicalId\":12569,\"journal\":{\"name\":\"Global Journal of Environmental Sciences\",\"volume\":\"78 1\",\"pages\":\"47-51\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2005-06-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Global Journal of Environmental Sciences\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.4314/GJES.V4I1.2440\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global Journal of Environmental Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4314/GJES.V4I1.2440","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Toxic Effect Of Azo Dyes On Nitrite-N Utilization By Nitrobacter
The toxicity of five azo dyes (toxicants) on Nitrobacter was investigated. The index for toxicity was inhibition of rate of nitrite-N utilization. The rate of nitrite-N utilization decreased with increase in concentration of each toxicant at specific exposure time. However, stimulation of utilization was obtained at low concentrations and short exposure time for two of the dyes. This was attributed to hyperactivity. The median effective concentration 50 (EC 50 ) values increased with increase in exposure time for each toxicant. This was attributed to acclimatization and/or detoxification. Inhibition was attributed to any/or all of the following factors: molecular size, impurities in the toxicants and dye content. KEY WORDS: Toxicity, Azo dyes, Nitrobacter, hyperactivity, acclimatization Global Journal of Environmental Sciences Vol.4(1) 2005: 47-51
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