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R E ECKER

Publications and source records attributed to R E ECKER.

7 recordsLinked to original sources
PubMed1961

Relationships between initial nutrient concentration and total growth.

Ecker, R. E. (Iowa State University, Ames), and W. R. Lockhart. Relationships between initial nutrient concentration and total growth. J. Bacteriol. 82:80-84. 1961.-The relationship observed between maximal attainable growth in a microbial population and initial concentration of limiting nutrient depends upon the parameter selected for measurement of growth. A linear relationship is found only when cell mass is the parameter. When population is used as the measure of growth, the relationship is: N(max) = K'C(0) (s), where N(max) is the maximal attainable population, C(0) is the initial concentration of limiting nutrient and K' and s are constants. The use of this expression in demonstrating subtle differences between strains is shown.

Bacteria↗
PubMed1961

Specific effect of limiting nutrient on physiological events during culture growth.

Ecker, R. E. (Iowa State University, Ames), and W. R. Lockhart. Specific effect of limiting nutrient on physiological events during culture growth. J. Bacteriol. 82:511-516. 1961.-In cultures of Escherichia coli strain K12, the sequence of physiological events at the time of growth cessation in populations limited by availability of carbon source (glucose), nitrogen source (ammonium sulfate), and oxygen was observed to differ in several respects. These included differences in the relationship between mass synthesis and cell division, the utilization of nonlimiting nutrients, and the nature of changes in energy metabolism. These observations are discussed with reference to problems involved in the experimental control of variables in growth studies.

Carbon↗