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  • 1
    Electronic Resource
    Electronic Resource
    Factors Affecting the Salinity Tolerance of the Freshwater Cryptomonad Chilomonas paramecium (1992)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 39 (1992), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The capacity of the freshwater cryptomonad Chilomonas paramecium to develop a tolerance for seawater in the growth medium was investigated as part of a research program exploring potential microbial food sources for estuarine bivalve mollusks. By gradually increasing the percentage of estuarine seawater included in a freshwater culture medium over the course of 10 years, strains were obtained that tolerate from 16 to 32% seawater (highest salinity 10.5 ppt), achieving equivalent final densities with similar gross biochemical composition. However, after subculture in seawater-containing media for over 20 years, growth rates in more-saline media remained appreciably slower than in low-salinity media. Reduction of C. paramecium growth rate by seawater was found to be exacerbated in media with an initial pH of 3.5 as compared with pH 4.0–5.0, suggesting either a specific H+ effect upon metabolism of the medium carbon source (lactic acid) or a general cation effect upon nutrient uptake or cell metabolism. By contrast, depression of growth rates at high salinity was ameliorated by eliminating sodium-phosphate enrichments in growth media. This suggests that cations in the phosphate salt were contributing to cation-mediated growth inhibition. Results indicate a potential for C. paramecium, cultured in moderately saline media with no phosphate enrichments, to be used as a carbohydrate supplement for laboratory and hatchery feeding of estuarine bivalve mollusks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1992.tb01470.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Hexose Analogs on Growth of Chilomonas paramecium (1970)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 17 (1970), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Observations on the effect of 7 glucose analogs on growth of C. paramecium showed that 2-deoxy-D-glucose and 2-deoxy-D-galactose inhibited growth. Inhibition in 2-DG was not influenced by pH, calcium concentration, or by carbon sources as lactate, acetate, n-butyl alcohol, or succinate. Similarly, glucose or glucose-6-phosphate did not reverse inhibition. Organisms were viable in 2-DG only when a carbon source in the basal medium was absent. Wherever a useful carbon source was present, 2-DG was lethal in concentrations over 40 mg/100 ml. Phosphorylation of 2-DG did not occur. Lactic acid dehydrogenase was not inhibited. Glucose-6-phosphate dehydrogenase appears to have an affinity for 2-DG; phosphohexose isomerase activity was decreased by 2-DG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1970.tb02360.x
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