Biomedical subjects
Publications and source records attributed to J W Simpson.
The case history of a six-year-old female chow chow with intractable diarrhoea is described. The clinical history and symptoms, together with the methods of diagnosis, indicated that the cause was bacterial overgrowth of the intestine leading to a malabsorption syndrome. The method of treatment and the response is also recorded.
Human collagenase was inhibited by test solutions of human gingival fibroblast culture media. The fibroblast-derived collagenase inhibitor was only slightly affected by 10 micrograms trypsin but was inactivated with 100 micrograms trypsin. The chaotropic agent KSCN (3 M) completely inactivated the inhibitor, whereas the thiol-blocking reagent, p-aminophenylmercuric acetate, partially inactivated the inhibitor. Inhibitory activity was retained at 60 degrees C but was abolished at 100 degrees C. Following ammonium sulfate fractionation, the fibroblast inhibitor was recovered in the supernatant at concentrations of at least 70% saturation. It is suggested that collagenase latency in soft connective tissues may derive from a collagenase-inhibitor complex formed by interaction of collagenase and a fibroblast-derived inhibitor.
Faecal samples were collected from newly impounded stray dogs and from dogs presented to a clinic by their owners. The dogs were categorised as strays or pets and their faeces as formed or unformed. The faeces were examined bacteriologically. Campylobacters were significantly (P less than 0.01) more frequently isolated from the faeces of the stray dogs but there was no significant difference between the frequency of isolation of the organism from formed or unformed faeces. The significance of this finding in relation to public health and animal health is noted.
Mononuclear cells isolated from peripheral whole blood were fractionated by erythrocyte-rosetting into T cells and non-T cell subpopulations which were tested for collagenase-producing capacity. Mononuclear cells and purified T lymphocytes, as well as non-T (B) lymphocytes, produced collagenase during serum-free culture. Removal of the macrophages from the non-T cells did not affect collagenase production by lymphocytes.
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The diet of pregnant women has been restricted in various ways since earliest history. Dietary restriction may have severely deleterious effects on the fetus. Our study revealed a positive correlation of prepregnancy weight and pregnancy weight gain to term infant birthweight. Their influences are independent and additive. It is of the utmost importance to the fetus and the future of the human race that the diet of pregnant women contain the caloric value and essential nutrients recommended by the National Research Council.
Glucose utilization by the marmoset salivary glands was studied radioisotopically, both in vitro and in vivo. Surgically excised, minced parotid and submandibular glands from 7 adult animals were incubated in vitro in a medium containing uniformly labeled 14C glucose (glucose-UL-14C), then subjected to respirometry measurements and to extraction and separation procedures for the radioautographic isolation and identification of amino acids, organic acids, and glucose. Glucose utilization in vivo by the marmoset salivary glands was determined in 3 animals by analysis for 14C-containing amino acids, organic acids and glucose in pilocarpine-stimulated whole saliva, following intraperitoneal injection of glucose-UL-14C. The whole saliva was fractionated, separated and processed for localization of radioactivity by the same methods that were used in the in vitro studies. The isolated and in situ salivary glands converted glucose-UL-14C into 14C-containing carbon dioxide, glycine, alanine, glutamic acid, aspartic acid, and lactate. In no instance did the amount of 14C-glucose secreted in saliva exceed 0.52 mg/100 ml..
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