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Choi JW, Stoecker DK. Effects of Fixation on Cell Volume of Marine Planktonic Protozoa. Appl Environ Microbiol 1989; 55:1761-5. [PMID: 16347970 PMCID: PMC202947 DOI: 10.1128/aem.55.7.1761-1765.1989] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The effects of fixation on the cell volume of marine heterotrophic nanoflagellates and planktonic ciliates were investigated. Decreases in cell volume depended on the combination of the protozoan taxa and the particular fixative. For a particular fixative and protozoan species, degree of shrinkage was independent of physiological state. The volume of fixed cells was found to be approximately 20 to 55% lower than the cell volume of live organisms. For the heterotrophic microflagellates, the fixatives ranked, in order of decreasing effect on cell volume, as glutaraldehyde, formaldehyde, acid Lugol's solution, and modified van der Veer solution. With oligotrichous ciliates and a tintinnid ciliate, formaldehyde caused less shrinkage than glutaraldehyde or acid Lugol's solution. With the aldehyde fixatives, the microflagellates were found to shrink more than the ciliates. Differential effects of fixation on cell volumes may result in an underestimation of the biomass of certain protozoan taxa in natural samples.
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302
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Kim KY, Choi JW, Sohn YM, Chung KS. A prospective study of development of splenic reticuloendothelial function in premature and term infants. Yonsei Med J 1980; 21:110-5. [PMID: 7314647 DOI: 10.3349/ymj.1980.21.2.110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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303
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Choi JW. Acute conditions: incidence and associated disability United States, July 1975-June 1976. VITAL AND HEALTH STATISTICS. SERIES 10, DATA FROM THE NATIONAL HEALTH SURVEY 1978:1-66. [PMID: 636316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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304
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Choi JW. Out-of-pocket cost and acquisition of prescribed medicines: United States, 1973. VITAL AND HEALTH STATISTICS. SERIES 10, DATA FROM THE NATIONAL HEALTH SURVEY 1977; Series 10:i-iv, 1-45. [PMID: 303403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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