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Biomedical subjects

L A Hook

Publications and source records attributed to L A Hook.

6 recordsLinked to original sources
PubMed1996

Quantifying cell mono-layer cultures by video imaging.

A method is described in which the relative number of adherent cells in multi-well tissue-culture plates is assayed by staining the cells with Giemsa and capturing the image of the stained cells with a video camera and charged-coupled device. The resultant image is quantified using the associated video imaging software. The method is shown to be sensitive and reproducible and should be useful for studies where quantifying relative cell numbers and/or proliferation in vitro is required.

Animals↗
PubMed1985

Determination of the molecular mass of bacterial genomic DNA and plasmid copy number by high-pressure liquid chromatography.

Relatively rapid methods for the determination of relative genome molecular mass (Mr) and the estimation of plasmid copy number have been developed. These methods are based on the ability of the Bio-Rad high-pressure liquid chromatography hydroxylapatite column to separate and quantify single-stranded DNA, double-stranded DNA, and plasmid DNA. Genome Mr values were calculated from reassociation kinetics of single-stranded DNA as measured with the hydroxylapatite column. Bacteriophage T4 DNA was used to establish a C0t (moles of nucleotides times seconds per liter), or standard reassociation value. From this C0t value, C0t values for Escherichia coli B, Beggiatoa alba B18LD, and Streptomyces coelicolor were determined by comparative calculations. From those calculated C0t values, the Mr values of 1.96 X 10(9) for E. coli, 2.02 X 10(9) for B. alba, and 3.28 X 10(9) for S. coelicolor were estimated. Plasmid concentration was determined from cleared lysates by comparing the integrated area under the phosphate buffer-eluted plasmid peak to values obtained with known amounts of plasmid. The plasmid copy number was estimated by multiplying the ratio between the amounts of plasmid and chromosomal DNA by the ratio between the Mr values of the chromosome and the plasmid. A copy number of 29 was obtained from a culture of E. coli HB101 harboring pBR322 grown to a culture density of 1.6 X 10(9) CFU . ml-1.

Chromatography, High Pressure Liquid↗
PubMed1981

Heterotrophic carbon metabolism by Beggiatoa alba.

The assimilation and metabolism of CO(2) and acetate by Beggiatoa alba strain B18LD was investigated. Although B. alba was shown to require CO(2) for growth, the addition of excess CO(2) (as NaHCO(3)) to the medium in a closed system did not stimulate growth. Approximately 24 to 31% of the methyl-labeled acetate and 38 to 46% of the carboxyl-labeled acetate were oxidized to (14)CO(2) by B. alba. The apparent V(max) values for combined assimilation and oxidation of [2-(14)C]acetate by B. alba were 126 to 202 nmol min(-1) mg of protein(-1) under differing growth conditions. The V(max) values for CO(2) assimilation by heterotrophic and mixotrophic cells were 106 and 131 pmol min(-1) mg of protein(-1), respectively. The low V(max) values for CO(2) assimilation, coupled with the high V(max) values for acetate oxidation, suggested that the required CO(2) was endogenously produced from acetate. Moreover, exogenously supplied acetate was required by B. alba for the fixation of CO(2). From 61 to 73% of the [(14)C]acetate assimilated by washed trichomes was incorporated into lipid. Fifty-five percent of the assimilated [2-(14)C]acetate was incorporated into poly-beta-hydroxybutyric acid. This was consistent with chemical data showing that 56% of the heterotrophic cell dry weight was poly-beta-hydroxybutyric acid. Succinate and CO(2) were incorporated into cell wall material, proteins, lipids, nucleic acids, and amino and organic acids, but not into poly-beta-hydroxybutyric acid. Glutamate and succinate were the major stable products after short-term [1-(14)C]acetate assimilation. Glutamate and aspartate were the first stable (14)CO(2) fixation products, whereas glutamate, a phosphorylated compound, succinate, and aspartate were the major stable (14)CO(2) fixation products over a 30-min period. The CO(2) fixation enzymes isocitrate dehydrogenase (nicotinamide adenine dinucleotide phosphate; reversed) and malate dehydrogenase (nicotinamide adenine dinucleotide phosphate; decarboxylating) were found in cell-free extracts of both mixotrophically grown and heterotrophically grown cells. The data indicate that the typical autotrophic CO(2) fixation mechanisms are absent from B. alba B18LD and that the CO(2) and acetate metabolism pathways are probably linked.

Acetates↗
PubMedDate not supplied

Data and metadata reporting standards for the U.S. Environmental Protection Agency's PM Supersites Research Program.

The EPA Supersites Research Program needs consistency of metadata and data structures to facilitate information sharing among investigators, analysts, and ultimately secondary data users. Under the auspices of NARSTO a successful mechanism was created to develop and implement reporting standards. The development effort included working closely with Supersites data coordinators, investigators, and technical experts, and also leveraging from existing data standards and practices. Overall, the standards are getting good acceptance from the atmospheric research community.

Cities↗