کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
213189 462086 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Maximum yield and standard enthalpy of growth of iron-oxidising bacteria
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Maximum yield and standard enthalpy of growth of iron-oxidising bacteria
چکیده انگلیسی

The standard enthalpy of combustion of acidophilic, iron-oxidising lithotrophic cells was determined to be − 23.98 kJ g(cells)− 1. This value is identical to that reported for the enthalpy of combustion for the bacteria E. coli and M. methylophilus. Using an average value for the standard entropy of formation of cell mass gave a Gibbs energy for the growth reaction of + 57 kJ equiv− 1. This figure is significantly different from that previously reported. The ability of iron-oxidising cells to produce biomass is evaluated in terms of a thermodynamic model. The theoretical yield of biomass was found to be most sensitive cytoplasmic pH and to the value of the Fe3+/Fe2+ couple (E°2). E°2 is in turn dependent on the speciation of iron in solution and process water quality. The observed yields of cell mass are ca. 30% of the maximum theoretical yield calculated from thermodynamic principles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 93, Issues 1–2, July 2008, Pages 66–71
نویسندگان
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