Effect of growth substrate on thermal death of thermophilic bacteria.
AUTOR(ES)
Merkel, G J
RESUMO
The heat sensitivity of gram-negative, hydrocarbon-utilizing thermophilic bacteria was altered by a change in growth substrate. Thermophilic strains CC-6, BI-1, and LEH-1, grown with acetate or n-heptadecane as the carbon source, had a higher survival rate when incubated 5 degrees C above their maximum growth temperature than cells of the same organism after growth on glucose or glycerol. There was a correlation between the growth substrated, heat resistance, and the ratios of cellular n-hexadecanoic acid/branched hexadecanoic acid and n-heptadecanoic acid/branched heptadecanoic acid. The bacterial cells that were more heat resistant had ratios of straight-chain/branched-chain fatty acids above 1.0, whereas the heat-sensitive cells had ratios below 0.6.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=242721Documentos Relacionados
- Effect of Several Environmental Conditions on the “Thermal Death Rate” of Endospores of Aerobic, Thermophilic Bacteria
- Effect of alfalfa fiber substrate on culture counts of rumen bacteria.
- Effect of neomycin and vancomycin on growth of some rumen bacteria.
- Protein-synthesizing machinery of thermophilic bacteria.
- Effect of DDT, dieldrin, and heptachlor on the growth of selected bacteria.