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Torrella F, Morita RY. Microcultural study of bacterial size changes and microcolony and ultramicrocolony formation by heterotrophic bacteria in seawater. Appl Environ Microbiol. 1981;41(2):518-27doi: 10.1128/aem.41.2.518-527.1981.
Torrella, F., & Morita, R. Y. (1981). Microcultural study of bacterial size changes and microcolony and ultramicrocolony formation by heterotrophic bacteria in seawater. Applied and environmental microbiology, 41(2), 518-27. https://doi.org/10.1128/aem.41.2.518-527.1981
Torrella, F, and Morita, R Y. "Microcultural study of bacterial size changes and microcolony and ultramicrocolony formation by heterotrophic bacteria in seawater." Applied and environmental microbiology vol. 41,2 (1981): 518-27. doi: https://doi.org/10.1128/aem.41.2.518-527.1981
Torrella F, Morita RY. Microcultural study of bacterial size changes and microcolony and ultramicrocolony formation by heterotrophic bacteria in seawater. Appl Environ Microbiol. 1981 Feb;41(2):518-27. doi: 10.1128/aem.41.2.518-527.1981. PMID: 16345721; PMCID: PMC243725.
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Appl Environ Microbiol. 1981 Feb;41(2):518-27. doi: 10.1128/aem.41.2.518-527.1981.

Microcultural study of bacterial size changes and microcolony and ultramicrocolony formation by heterotrophic bacteria in seawater.

Applied and environmental microbiology

F Torrella, R Y Morita

Affiliations

  1. Department of Microbiology and School of Oceanography, Oregon State University, Corvallis, Oregon 97331.

PMID: 16345721 PMCID: PMC243725 DOI: 10.1128/aem.41.2.518-527.1981

Abstract

With a microculture technique and time-lapse, phase-contrast photomicrography, it was possible to follow the division of individual cells and the development of microcolonies of bacteria in freshly collected marine water samples. A certain number of marine bacteria, upon inoculation onto a nutrient rich agar surface, displayed an increase in size as well as a high growth rate. Other bacteria were identified as very small marine bacteria (ultramicrobacteria). These had a very slow growth rate when inoculated onto a nutrient-rich agar surface. These latter cells formed very small microcolonies (ultramicrocolonies), and cell size did not increase significantly. These two types of marine heterotrophs could be described in terms of zymogenous and autochthonous bacteria, a concept used by Winogradsky for describing soil microorganisms.

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