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, directed at providing more consistent results, remains to be done. 8 refs., 35 figs.
- Research Organization:
- Oak Ridge National Lab., TN (USA); Solar Energy Research Inst., Golden, CO (USA)
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 6757339
- Report Number(s):
- SERI/STR-231-3089; ON: DE87001141
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
09 BIOMASS FUELS
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
550700* -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ALGAE
AQUATIC SPECIES PROGRAM
BIOSYNTHESIS
CELL FLOW SYSTEMS
ELECTRON MICROSCOPY
LIPIDS
MICROSCOPY
MORPHOLOGICAL CHANGES
ORGANIC COMPOUNDS
PLANTS
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
ULTRASTRUCTURAL CHANGES
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
550700* -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ALGAE
AQUATIC SPECIES PROGRAM
BIOSYNTHESIS
CELL FLOW SYSTEMS
ELECTRON MICROSCOPY
LIPIDS
MICROSCOPY
MORPHOLOGICAL CHANGES
ORGANIC COMPOUNDS
PLANTS
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
ULTRASTRUCTURAL CHANGES