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Biomedical subjects

M E Heath

Publications and source records attributed to M E Heath.

27 records · Page 2Linked to original sources
PubMed1983

The effects of rearing-temperature on body composition in young pigs.

Pigs were reared for 23, 35, 42, or 59 days in a cold (10 degrees C) or a warm (35 degrees C) environment. They were fed to grow at the same rate. The total amount of fat was greater in warm-reared than in cold-reared pigs and fat was distributed differently in the two groups. Warm-reared pigs had more fat in the subcutaneous layer while cold-reared pigs had more fat in their abdominal tissues and skeletal muscle. The total amount of nitrogen was greater in cold-reared than in warm-reared pigs and no difference was found in its distribution.

Adipose Tissue↗
PubMed1982

Metabolic and acid-base changes during selection of warmer water by cold-acclimated fish.

Largemouth bass (Micropterus salmoides) acclimated to 3 degrees C were placed in a thermal gradient. The bass selected the final thermal preferendum of 28 degrees C in about 18 h. The movement into warmer water was initially rapid but became progressively slower. 2) Other bass were acclimated to 8 degrees C, cannulated in the dorsal aorta, and placed in a temperature-controlled chamber. Oxygen uptake, blood pH, and total CO2 were measured as the chamber temperature was increased to 28 degrees C following a time course similar to that followed by bass in the gradient. 3) Oxygen uptake was always elevated above the resting level, and this elevation increased as higher temperatures were encountered. 4) Just prior to placement in the chamber the pH of the arterial blood was 7.98 +/- 0.05 (mean +/- SE). As the temperature was increased neither the pH nor the total CO2 content of the blood exhibited major changes. At temperatures between 26 and 28 degrees C, the pH (8.01 +/- 0.03) was about 0.3 pH units above predicted normal values. 5) During the return to the final thermal preferendum fish experience overall metabolic rates and extracellular acid-base levels that deviate progressively farther from normal resting levels. Neither factor appears likely to be the major determinant of the behavioral response.

Acclimatization↗
PubMed1980

Aural health in 227 Northland school and preschool children.

Two hundred and seventy-seven Northland school and preschool children were examined to determine the current incidence of chronic suppurative otitis media and middle ear effusion in the child population of one area. A reduction in incidence of CSOM from 10.5 percent in 1974 to 2.7 percent in 1978 is attributed to the successful mobile ear clinic's child health hearing conservation programme. The incidence of middle ear effusion would indicate that this condition may be less uncommon in Maori children than is generally believed. The value of impedance audiometry as a screening procedure is considered.

Acoustic Impedance Tests↗
PubMed1977

The treatment and prevention of chronic otorrhoea in the Northland health district.

The operation of a mobile ear clinic within the school medical service in Northland is described. The major justification for the use of a sophisticated unit lies in the opportunity which it affords for the education of children and adults on aural health. The higher costs of treatment may well be more than offset by the long-term benefits resulting from increased awareness and better understanding in our population on the causation of supporative otitis media.

Child↗
PubMed1977

Thermal effects of reproductive hormones on the sheep udder.

The thermal effect of reproductive hormones on the sheep udder was tested in five ewes at the end of their breeding season. Radiotelemetry was used to provide continuous recordings of deep body temperature (Tb), udder skin temperature (Tud), and back skin temperature (Tbk) while the animals were held in a controlled-environment isolation chamber. Injections of estradiol (1.0 and 2.5 mg, im) resulted in an increase in Tud, but not in Tb, and only occasionally in Tbk. The amplitude of the rise in Tud varied from 0.4 to 3.8 degrees C and the rise persisted over 48 h following injection. Injections of saline, prostaglandin (PGF2alpha), or progesterone did not affect Tud, and injections of pyrogen (typhoid vaccine) elicited only an insignificant change in Tud concurrent with substantial increases in Tb and Tbk.

Animals↗