Growth of characterristics of two diatoms isolated from the eleveted water tanks of buildings in Kanagawa Prefecture

Abstract

Two taxa diatoms, Achnanthes affinis v. affinis and A.microcephala were isolated from the samples collected from elevated water tanks of buildings, in Kanagawa Prefecture. The growth characteristics of two diatoms were studied in several experimental conditions. The results clearly domonstrate that the growth of the diatoms required alkaline medium for optimal growth. The optimal growth of the diatoms were obtained t 20°C, pH8.0 with growth rate μ=1.0-1.1, doubling time=14.2-14.8 hours and number of generation=2.84-3.00. The maximum phtosynthesis of the diatoms were obtained at 30°C with 4.1 (O₂ mg/mg chl. a/h) .