کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10236219 45140 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Genetic engineering of E. coli SE5000 and its potential for Ni2+ bioremediation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Genetic engineering of E. coli SE5000 and its potential for Ni2+ bioremediation
چکیده انگلیسی
A genetically engineered Escherichia coli SE5000 strain simultaneously expressing nickel transport system and metallothionein was constructed to accumulate Ni2+ from aqueous solution. Bioaccumulation was fast and followed linearized Langmuir isotherm. Compared with 1.62 mg/g of Ni2+ uptake capacity by original host E. coli cells, genetically engineered E. coli could bind 7.14 mg/g Ni2+, and it accumulated Ni2+ effectively over a broad range of pH (4-10) and the optimal pH was 8.6. The presence of 1000 mg/l Na+ and Ca2+ or 50 mg/l Cd2+ and Pb2+ did not decrease Ni2+ bioaccumulation significantly, but Mg2+, Hg2+, Cr3+ and Cu2+ posed severe deleterious influences on Ni2+ uptake by genetically engineered E. coli. Furthermore, the presence of EDTA inhibited nickel bioaccumulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Process Biochemistry - Volume 40, Issue 1, January 2005, Pages 425-430
نویسندگان
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