Biomedical subjects

D Hamilton

Publications and source records attributed to D Hamilton.

At least 145 records · Page 8Linked to original sources

PubMed1976

Transfer of parental immunity to infectious laryngotracheitis in chicks.

The transfer of parental immunity to infectious laryngotracheitis was appraised by measuring serum antibody levels in 150 chicks from the day of hatch up to five weeks. The breeder flock which had received primary vaccination at eight weeks and a booster at 20 weeks transferred high antibody levels which fell markedly within two weeks and remained constant thereafter. Chicks whose parents were vaccinated at 20 weeks only, had low antibody levels throughout. These low levels, in either group of chicks, appeared to offer marginal protection only and were unlikely to inhibit the response to primary vaccination.

Animals↗

PubMed1975

Influence of personality on achievement of medical students.

In this study second year medical students completed a battery of psychometric tests which measured both cognitive and non-cognitive personality traits. Personality profiles obtained have been compared with reported norms from some other published sources. The scores obtained from factor analyses of these tests were used as predictors of total achievement in cellular biology and physiology over two years. In agreement with reports by other authors we found that the most important trait contributing to achievement was introversion/extra-version with introversion correlating with high achievement particularly in multiple choice tests. Emotional maturity was also a major factor especially as a predictor of success in essay tests. General mental ability, verbal skills, and reading comprehension appeared as significant predictors of achievement, and these were apparently of comparable importance in both kinds of test. Students of foreign origin whose first language was other than English tended to perform better in essay than multiple choice tests but their overall performance was lower than would have been expected from their other personality traits including their verbal skills. On the other hand, students resident in college halls tended to have better overall performance than expected.

Achievement↗

PubMed1975

Reasons for differential performance in multiple choice and essay tests.

1. Previous studies with preclinical students demonstrated that there were factors other than topic content which produced significant differences in performance in multiple choice (MC) and essay (E) tests. 2. In this study second year medical students completed a battery of psychometric tests measuring both cognitive and non-cognitive personality traits. 3. The scores obtained after factor analyses of these tests were used as predictors of the difference in performance in 6 matched pairs of MC and E achievement tests over 2 years. 4. Students with high scores in a factor associated with introversion achieved better results in MC tests than would have been expected from their performance in E tests. On the other hand, students whose first language was not English did not perform as well in MC as they did in E tests. 5. Students with high scores in a factor associated with emotional maturity and illegible writing performed better in E tests than would have been expected from their MC results.

Analysis of Variance↗

PubMed1975

The effect of mixed grazing of sheep and cattle on worm burdens in lambs.

Lambs from ewes grazed without cattle at 4.9, 7.4 and 9.9 ewes and lambs per hectare and from ewes run with steers at an equivalent median stocking rate at four ratios in which sheep comprised 30%, 40%, 50% and 70% of the animal equivalents were killed and examined for worms. When sheep grazed alone, there was no significant increase in the number of worm species normally found in sheep, namely Ostertagia circumcincta and Nematodirus spathiger, with an increase in stocking rate. When sheep grazed with cattle, there was a decrease in the number of worm species normally found in sheep but an increase in the number of those normally found in cattle, namely Cooperia oncophora and Trichostrongylus axei, as the proportion of cattle in the ratio increased. The total worm burdens were low due to the management of the flock and parasites were not shown to have affected productivity. The results are discussed and the practical aspects of the findings are presented.

Abomasum↗

PubMed1974