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Utilization of 4 Sugars Known to Occur in Activated Sludge by Aspidisca cicada (Ciliata, Hypotrichida); Effect on Division Rate
Author(s) -
BROWN TIM J.
Publication year - 1967
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1967.tb02005.x
Subject(s) - lactose , sucrose , arabinose , bacteria , biology , galactose , botany , carbohydrate , chemistry , ciliata , food science , biochemistry , fermentation , protozoa , xylose , genetics
SYNOPSIS. Indiviluals of the hypotrich Aspidisca cicada (Müller) were separated from activated sludge and grown clonally. Lactose and sucrose increased its division rate; D‐glucose and arabinose were inhibitory. All 4 sugars stimulated growth of the bacteria associated with A. cicada. Spectrophotometric detection of acid production showed that A. cicada utilized lactose and sucrose markedly, glucose only slightly, and arabinose not at all. The increased fission rate in the presence of lactose and sucrose is probably caused directly by these sugars providing a carbon source, and indirectly by increasing the supply of food bacteria. Retardation of growth of A. cicada in the presence of glucose or arabinose perhaps results from these sugars somehow making the food bacteria unavailable to A. cicada. Sugars found in activated sludge may inhibit or stimulate growth in populations of A. cicada , frequently one of the dominant Protozoa in activated sludge.