Abstract:
:Ribosomal efficiency (RE) estimates provide a quantitative descriptor of intrinsic growth rate of cell populations using readily-obtainable experimental data. In Aspergillus nidulans chemostat cultures, RE increased linearly with growth rate over the range 25-60% of maximum growth rate (mu max), consistent with increasing ribosomal usage with increased growth rate. Above 60%, RE did not increase significantly, suggesting that all ribosomes were functional at 60% of mu max, further increases in growth rate, presumably resulting from increased polypeptide chain elongation rate. Extrapolating the linear part of the RE/growth rate curve predicted zero RE at a growth rate of 0.04 h-1. Chemostat steady state cultures at 0.04 h-1 contained spores (conidia), apparently undergoing a continuous sporulation/germination cycle. We propose that the RE estimates provide a means of predicting the value of minimum specific growth rate (mu min) below which net growth cannot take place.
journal_name
J Basic Microbioljournal_title
Journal of basic microbiologyauthors
Bushell ME,Bull ATdoi
10.1002/(sici)1521-4028(199912)39:5/6<293::aid-jobsubject
Has Abstractpub_date
1999-01-01 00:00:00pages
293-8issue
5-6eissn
0233-111Xissn
1521-4028pii
10.1002/(SICI)1521-4028(199912)39:5/6<293::AID-JOBjournal_volume
39pub_type
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