Effect of low-osmality nutrient media on growth and culturability of Campylobacter species

Article Abstract:

A study was conducted to analyze the impact of low-osmolality nutrient media on the growth and culturability of a number of Campylobacter species. The effects of environmental temperature on the growth and survival of species were also examined. Results indicated that the osmotic threshold effect was not limited to C. jejuni NCTC 11351. Findings also suggested that declines in the culturability of C. jejuni could be correlated with losses in cytoplasmic contents resulting from exposure to low-osmolality nutrient media.

Campylobacter, Osmosis, Cytoplasm

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Development of a defined minimal medium for the growth of Edwardsiella ictaluri

Article Abstract:

A study was conducted to determine the minimal nutritional requirements of Edwardsiella ictaluri. A completely defined medium was first developed to deermine minimal requirements, afterwhich a minimal defined medium supporting Edwardsiella ictaluri growth was developed. The minimal medium reduces the 46 components of the complete medium to eight essential components. Specific amino acids dependent on the specific requirements of indivudual Edwardsiella ictaluri strains were also identified.

Developmental biology, Microorganisms

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Optimal renewal rate and nutrient concentration for the production of the marine microalga Phaeodactylum tricornutum in semicontinuous cultures

Article Abstract:

The cell density of the marine microalga Phaeodactylum tricornutum is highest at a concentration of 8 to 16 milli-moles of nitrogen/liter and a renewal rate of 10%. The protein concentration increases with an increase in nutrient concentration and renewal rate. The steady-state cell concentration, and carbohydrate and lipid levels decrease with an increase in nitrogen level, due to an increase in the renewal rate. Lipids and carbohydrates are reserved as energy sources in the algae.

Reports, Lipid research, Marine algae

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