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Biomedical subjects

A A Benson

Publications and source records attributed to A A Benson.

At least 55 records · Page 3Linked to original sources
PubMed1970

The metabolism of wax ters and other lipids by the marine copepod, Calanus helgolandicus.

The polyunsaturated wax esters which occur in an oil droplet in Calanus helgolandicus apparently serve as a short term reserve metabolic fuel. The lipids of the copepods were labeled by feeding them (14)C-labeled diatoms, Skeletonema costatum, after which starvation and turnover experiments were carried out. During starvation both wax esters and triglycerides are largely depleted within 72 hr, whereas cholesterol and phospholipid decreased at much slower rates.

Animals↗
PubMed1969

Phorbic Acid biosynthesis in the latex vessel system of euphorbia.

Evidence is presented that phorbic acid is formed in the latex producing cell system, rather than in photosynthetic or chlorophyll-free tissues of Euphorbia resinifera Berg. When a branch of the plant was kept first in a (14)CO(2) atmosphere with 12 hr light-dark periods for 2 days and then left under natural conditions in the air outside for at least 2 to 3 days, radioactive phorbic acid was found in the latex. Phorbic acid synthesis appeared to be independent of the photosynthetic and respiratory activities of the plant.Besides phorbic acid 2 other major radioactive compounds were recognized in the latex, a glycoside or oligosaccharide, and a lipid belonging to the group of triterpenoid compounds characteristic of the latex in several species of Euphorbia.

Journal Article↗
PubMed1967

Food value of red tide (Gonyaulax polyedra).

Two harvests of ocean-growing red tide, comprised mainly of Gonyaulax polyedra, were evaluated in limited trials of rat feeding. The protein of red tide (25 to 30 percent, dry basis) supported growth satisfactorily. The essential amino acid composition of the protein closely resembles that of casein, the major protein of milk. As a marine resource, plankton represents a challenge for research.

Amino Acids↗
PubMed1967

Alpha-linoleate and photosynthetic activity in Chlorella protothecoides.

Green cells of Chlorella protothecoides grown in nitrogen-rich low glucose media may be reversibly transformed to entirely chlorophyll-less cells in low nitrogen high glucose media. Photosynthetic rates and fatty ester compositions were determined during light and dark bleaching and during greening. Linolenic acid content remained unchanged during greening or bleaching. During light greening chlorophyll content and photosynthetic activity increased while oleic acid content decreased dramatically. As a result, the percent composition of linolenate appeared to parallel photosynthetic capability. Implication of alpha-linolenate in oxygen production, therefore, can not be based upon fatty acid percentage composition data alone.

Eukaryota↗
PubMed1967

Phospholipids of Thiobacillus thiooxidans.

Cells and spent growth media from sulfur- and thiosulfate-grown cultures of Thiobacillus thiooxidans were analyzed. The phosphatides were examined by thinlayer chromatography, and the products of their hydrolysis by hydrochloric acid and methanolic potassium hydroxide were separated by paper chromatography. The phospholipids in both cells and spent growth media were identified as phosphatidyl ethanolamine, phosphatidyl-N-monomethylethanolamine, phosphatidyl glycerol, and diphosphatidyl glycerol. These comprised about 97% of the total lipid phosphorus. Lyso-phosphatidyl-N-monomethylethanolamine and lysophosphatidyl glycerol accounted for the remaining 3%. The percentage of the total lipid phosphorus accounted for by each phospholipid depended on the age of the culture.

Autoradiography↗