||Equivalence of Microbial Biomass Measures Based on Membrane Lipid and Cell Wall Components, Adenosine Triphosphate, and Direct Counts in Subsurface Aquifer Sediments (Journal Version).
Balkwill, D. L. ;
Leach, F. R. ;
Wilson, J. T. ;
McNabb, J. F. ;
White, D. C. ;
||Florida State Univ., Tallahassee. Dept. of Biological Science. ;Oklahoma State Univ., Stillwater. Dept. of Biochemistry. ;Tennessee Univ., Knoxville.;Robert S. Kerr Environmental Research Lab., Ada, OK.
||EPA-R-813725 ;EPA-R-812504; EPA/600/J-88/131;
Soil microbiology ;
Adenosine phosphates ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
An uncontaminated subsurface aquifer sediment contains a sparse microbial community consisting primarily of coccobacillary bacteria of relatively uniform size which can be counted directly with appropriate straining. The morphological simplicity and the relatively decreased cell numbers, when compared with surface soils and sediments, make the subsurface an ideal natural community with which to compare the utility of chemical measures of microbial biomass to direct microscopic counts. The membrane phospholipids (estimated as the polar lipid fatty acids, the lipid phosphate, and phosopholipid glycerol phosphate), lipopolysaccharide lipid A (estimated as the LPS hydroxy fatty acids), cell walls (estimated as the muramic acid), and adenosine triphosphate all give essentially identical estimates of cell numbers and dry weight as the direct counts, using conversion factors determined on subsurface microorganism monocultures. Assays of microbial cell components are thus validated by comparison with the classical direct count in at least one soil/sediment. (Copyright (c) 1988 Springer-Verlag New York, Inc.)