連続混合培養系における活性汚泥由来の細菌フロラに及ぼす稀釈率の影響

概要

論文の詳細を見る
The influence of low dilution rate (1.4-0.067 day^<-1>) on the bacterial flora was studied by using continuous mixed culture systems which were inoculated with activated sludge microflora and fed with a substrate solution of 500mg/l skim milk. The O_2-uptake rate and lactose removal rate of the microbial populations increased with the increase in dilution rate. The number of aerobic heterotrophic bacteria was the highest at the highest dilution rate, and the lowest at the intermediate dilution rate of 0.41 day^<-1>. The bacterial composition in the systems varied both at the generic level and also at the species level as the dilution rate varied. The isolates belonging to Flavobacterium-Cytophaga constituted a greater percentage of the isolates from the systems with higher dilution rates, but Acinetobacter-Moraxella was dominant in isolates from the cultures with lower rates. The relative abundance of bacteria with complex nutritional demand increased with the decrease in dilution rate. The isolates which were able to grow within wide ranges of temperature and pH and in the presence of some antibiotics made up decreasing percentages of the population at lower dilution rates.
日本生態学会の論文
1981-03-30