1887

Abstract

Several parameters of phage T4 adsorption to and growth in B/r were determined. All changed monotonously with the bacterial growth rate (μ), which was modified by nutritional conditions. Adsorption rate was faster at higher μ values, positively correlated to cell size, and increased by pretreatment with low penicillin (Pn) concentrations; it was directly proportional to total cellular surface area, indicating a constant density of T4 receptors on cell envelopes irrespective of growth conditions. Parameters of phage development and cell lysis were μ-dependent. The rate of phage release and burst size increased, while the eclipse and latent periods decreased with increasing μ. Differentiation between the contribution of several physiological parameters to the development of T4 was performed by manipulating the host cells. A competitive inhibitor of glucose uptake, methyl α-D-glucoside, was exploited to reduce the growth rate in the same effective carbon source. Synchronous cells were obtained by the ‘baby-machine’ and large cells were obtained by pretreatment with low Pn concentrations. Lysis was delayed by superinfection, and DNA content and concentration were modified by growing a mutant in limiting thymine concentrations. The results indicate that burst size is not limited by cell size or DNA composition, nor directly by the rate of metabolism, but rather by the rates of synthesis and assembly of phage components and by lysis time. The rates of synthesis and assembly of phage components seem to depend on the content of the protein-synthesizing system and lysis time seems to depend on cellular dimensions.

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1997-01-01
2021-10-28
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