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. 1981 Nov;148(2):541–550. doi: 10.1128/jb.148.2.541-550.1981

Long-term nutrient starvation of continuously cultured (glucose-limited) Selenomonas ruminantium.

R W Mink, R B Hespell
PMCID: PMC216238  PMID: 6170629

Abstract

Selenomonas ruminantium, a strictly anaerobic ruminal bacterium, was grown at various dilution rates (D = 0.05, 0.25, and 0.35 h-1) under glucose-limited continuous culture conditions. Suspensions of washed cells prepared anaerobically in mineral buffer were subjected to nutrient starvation (24 to 36 h; 39 degrees C; N2 atmosphere). Regardless of growth rate, viability declined logarithmically, and within about 2.5 h, about 50% of the populations were nonviable. After 24 h of starvation, the numbers of viable cells appeared to be inversely related to growth rate, the highest levels occurring with the slowest grown population. Cell dry weight, carbohydrate, protein, ribonucleic acid (RNA), and deoxyribonucleic acid declined logarithmically during starvation, and the decline rates of each were generally greater with cells grown at higher D values. Both cellular carbohydrate and RNA declined substantially during the first 12 h of starvation. Most of the cellular RNA that disappeared was found in the suspending buffer as low-molecular-weight, orcinol-positive materials. During growth, S. ruminantium made a variety of fermentation acids from glucose, but during starvation, acetate was the only acid made from catabolism of cellular material. Addition of glucose or vitamins to starving cell suspensions did not decrease loss of viability, whereas a starvation in the spent culture medium resulted in a slight decrease in the rate of viability loss. Overall, the data indicate that S. ruminantium strain D has very little survival capacity under the conditions tested compared with other bacterial species that have been studied.

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Selected References

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