Search PubMed⌕ Search

Biomedical subjects

D W Piper

Publications and source records attributed to D W Piper.

141 records · Page 8Linked to original sources
PubMed1966

Isoenzymes of lactate dehydrogenase in human gastric mucosa and gastric carcinoma tissue.

Lactate dehydrogenase (LDH) isoenzymes were demonstrated electrophoretically in human fundic and pyloric gastric mucosae and in gastric carcinoma tissue. Fundic gastric mucosa consistently displayed a pattern with predominance of LD1, LD2, and LD3. Pyloric gastric mucosa and cancer tissue consistently had identical patterns with a predominance of LD2, LD3, and LD4, differing significantly from the LDH isoenzyme pattern of fundic mucosa. The LDH isoenzyme pattern characteristic of fundic mucosa extended very close to the histological junction between body and pyloric gastric mucosa and was not affected by the presence of gastritis in the stomach. These results serve to demonstrate yet another difference between mucosa from the acid-secreting and the pyloric areas of the human stomach.

Gastric Mucosa↗
PubMedDate not supplied

TCDD alters pituitary-adrenal function. I: Adrenal responsiveness to exogenous ACTH.

Plasma ACTH concentrations in 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD)-treated rats (50 micrograms/kg; single, oral dose) were 2.1-, 2.1-, 2.9-, 1.7-, 1.5-, 2.0- and 3.0-fold greater than control values, respectively, at days 1, 3, 5, 7, 10, and 14. At days 1 and 5 plasma corticosterone concentrations were increased 5.1- and 8.0-fold, respectively; whereas, at days 10 and 14 they were depressed to values of 50% and 39% of controls, respectively. Adrenal glands were excised from rats treated with TCDD and corticosterone production was assessed. Basal corticosterone concentrations produced by treated adrenals were depressed to 81%, 72%, and 71% of control values at days 5, 7, and 14, respectively. Corticosterone secretion by ACTH stimulated adrenals was equivalent to controls. These findings suggest that TCDD exposure decreases the bioactivity of the ACTH secreted by the anterior pituitary.

Adrenal Glands↗
PubMedDate not supplied

Perforated peptic ulcer in Hong Kong and New South Wales.

Direct comparisons of ulcer perforation rates and trends between countries have not been made in the past. Data on hospital admissions for perforated peptic ulcer during 1 January 1979 to 31 December 1985 were collected in Hong Kong (5868 perforations) and New South Wales, Australia (1669 perforations). Age and sex specific rates per 100,000 population were calculated. In Hong Kong, annual duodenal ulcer and gastric ulcer perforation rates were 13-16 and under two per 100,000 population respectively. In New South Wales, the corresponding rates were between three and four and under two per 100,000 population, respectively. The male:female ratios for duodenal ulcer perforation were consistently about 5:1 in Hong Kong and 2:1 in New South Wales, and for gastric ulcer perforation about 2:1 and 1:1, respectively. The incidence of perforation increased with age, and there was a statistically significant rise, over time, in duodenal but not gastric ulcer perforation rates in persons aged over 60 years in New South Wales; similar trends were seen in Hong Kong. Thus duodenal ulcer perforation occurs five times more commonly in Hong Kong than in New South Wales and this is largely accountable for by the higher rates of duodenal ulcer perforation in Chinese than in Australian males. Such geographical differences can best be explained by the occurrence of multiple aetiological mechanisms in ulcer perforation. Furthermore, there appears to be an increased susceptibility and an appreciable rising trend for duodenal ulcer perforation to occur in the elderly.

Adult↗