On describing microbial growth kinetics from continuous culture data: Some general considerations, observations, and concepts.

Abstract:

:Analysis of continuous culture methodology suggests that this potentially powerful tool for kinetic analysis can be improved by minimizing several inherent shortcomings. Medium background substrates - organic carbon, phosphate, and manganese - were shown to dominate kinetic observations at concentrations below chemical detection methods. Reactor wall growth, culture size distribution changes, sample removal-induced steady state perturbations, and limiting substrate leakage from organisms are treated in terms of kinetic measurement errors. Large variations in maximal growth rates and substrate uptake rates found are attributed to experimental protocol-induced transient states. Relationships are presented for correcting limiting substrate concentrations for lability during sampling, contamination with unreacted medium, and background substrate effects. Analytical procedures are discussed for improved measurement of limiting substrate kinetics involving enzymes, isotopes, and material balance manipulation. Relaxation methods as applied to continuous culture are introduced as a means for isolating separate rate constants describing net substrate transport and for evaluating cellular metabolite leakage. Low velocity growth, multiple substrate metabolism, and endogenous metabolism are discussed along with measurements showing that 1-month generation times for aquatic microorganisms can be quite normal and that the kinetics are compatible withμg/liter limiting substrate concentrations. The concept of regarding growth kinetics as the sum of several net accumulation processes is suggested.

journal_name

Microb Ecol

journal_title

Microbial ecology

authors

Law AT,Robertson BR,Dunker SS,Button DK

doi

10.1007/BF02011647

subject

Has Abstract

pub_date

1975-12-01 00:00:00

pages

261-83

issue

4

eissn

0095-3628

issn

1432-184X

journal_volume

2

pub_type

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