請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/45368
標題: Purple nonsulfur bacteria diversity in activated sludge and its potential phosphorus-accumulating ability under different cultivation conditions
作者: Liang, C.M.
洪俊雄
Hung, C.H.
Hsu, S.C.
Yeh, I.C.
關鍵字: Chemoheterotrophic
Phosphorus removal
Photoheterotrophic
PNS
Polyphosphate
Wastewater treatment plants
polyphosphate kinase gene
alga dunaliella-salina
waste-water
sp-nov
microlunatus-phosphovorus
rhodobacter-sphaeroides
hydrogen-production
phosphate removal
alkaline stress
pure culture
期刊/報告no:: Applied Microbiology and Biotechnology, Volume 86, Issue 2, Page(s) 709-719.
摘要: This study investigates the diversity and the potential phosphorus-accumulating ability among the purple nonsulfur (PNS) bacteria. Traditional methods and molecular biotechniques were applied. Microscopic visualization using 4',6-diamidino-2-phenylindole staining as well as chemical analysis demonstrated that most of the isolated PNS bacteria presented different levels of phosphorus accumulation. Four of the pure cultures, denoted as Rhodopseudomonas palustris CC1, CC7, G11, and GE1, based on their differences in the PNS's pufM gene, exhibited higher internal phosphorus content compared to other isolated strains in this study. In addition, substantial polyphosphate accumulation was observed after the bacteria entered their stationary growth phase. Among them, the isolated R. palustris G11 could accumulate internal phosphorus up to 13%-15% of its cell dry weight under anaerobic illuminated incubation conditions. When the incubation status was switched from anaerobic to aerobic, the bacterial phosphorus content had a tendency to decrease slightly or remain about the same throughout the whole aerobic stage. The growth rate and biomass were higher when the PNS bacteria grew under photoheterotrophic conditions rather than the chemoheterotrophic ones. Furthermore, the environmental pH value could affect the contents of internal bacterial phosphate. Results of this study demonstrated that PNS bacteria are a group of the polyphosphate-accumulating organisms, of which this ability had never been properly studied. The conditions that PNS bacteria accumulating polyphosphate presented from this study were unique and showed characteristics that were different from the well-known enhanced biological phosphorus removal model.
URI: http://hdl.handle.net/11455/45368
ISSN: 0175-7598
顯示於類別:環境工程學系所

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