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Title: Ultrastructural and flow cytometric analyses of lipid accumulation in microalgae

Lipid accumulation in three species of microalgae was investigated with flow cytometry (FCM) and transmission electron microscopy (TEM). Previous studies using batch cultures of a algae have led to the assumption that lipid accumulation in microalgae is a gradual process requiring at least several days for completion. However, FCM reveals, through changes in the chlorophyll:lipid ratio, that the time span required for individual cells to change metabolic state is short. Simultaneous FCM measurements of chlorophyll and nile red (neutral lipid) fluorescence in individual cells of nitrogen-deficient Isochrysis populations revealed a bimodal population distribution as one stage in the lipid accumulation process. The fact that two discrete populations exist, with few cells in an intermediate stage, suggests rapid response to a liqid trigger. Interpretations of light and electron microscopic observations are consistent with this hypothesis. The time required for an entire population to achieve maximum lipid content is considerably longer than that required for a single cell, due to the variation in response time among cells. In this study high lipid cultures were sometimes obtained by using FCM to separate high lipid cells from the remainder of the population. FCM holds much promise for strain enhancement but considerable developmental work, directedmore » at providing more consistent results, remains to be done. 8 refs., 35 figs.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
6757339
Report Number(s):
SERI/STR-231-3089
ON: DE87001141
DOE Contract Number:
AC02-83CH10093
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
Research Org:
Oak Ridge National Lab., TN (USA); Solar Energy Research Inst., Golden, CO (USA)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 09 BIOMASS FUELS; ALGAE; ULTRASTRUCTURAL CHANGES; LIPIDS; BIOSYNTHESIS; CELL FLOW SYSTEMS; TRANSMISSION ELECTRON MICROSCOPY; ELECTRON MICROSCOPY; MICROSCOPY; MORPHOLOGICAL CHANGES; ORGANIC COMPOUNDS; PLANTS; SYNTHESIS; AQUATIC SPECIES PROGRAM; 550700* - Microbiology; 140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)