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Biomedical subjects

K Vasantha

Publications and source records attributed to K Vasantha.

29 records · Page 2Linked to original sources
PubMed1988

Host feeding patterns of Anopheles culicifacies species A and B.

Countercurrent immunoelectrophoresis was used to assay bloodmeals to determine the host specificity of Anopheles culicifacies species A and B, collected from areas in Delhi, Uttar Pradesh and Bihar. Results indicated the predominantly zoophagic nature of species A and B with a relatively higher degree of anthropophagy for species A. Further, the human blood index was found to be related to the proportion of human and cattle population in an area. This study is significant because, of the two species only species A was incriminated as the vector of malaria in these areas.

Animals↗
PubMed1987

Egg-float ridge number in Anopheles stephensi: ecological variation and genetic analysis.

Eight Indian laboratory stocks of Anopheles stephensi Liston could be grouped into three categories with, respectively, 14-22, 12-17 and 9-15 ridges on the egg-floats. The mode number of ridges among the eggs laid by individual females in these stocks was 16-19, 13-16 and 10-14, respectively. The category with the highest egg-float ridge number corresponded with the type-form and the lowest with var. mysorensis Sweet and Rao; the new egg-float category with ridge number modes of thirteen to sixteen was designated as 'intermediate'. All three forms, i.e. type-form, intermediate and myosorensis were observed in semi-urban areas while only intermediate and mysorensis were seen in rural areas. Breeding experiments indicated no post-copulatory barriers between the populations. Likelihood analysis of the results of crosses and back crosses indicated that variation in ridge number is controlled by more than one genetic factor. The stocks with different ridge numbers are best considered as 'ecological variants'.

Animals↗
PubMed1983

Heterochromatin variation and sex chromosome polymorphism in Nesokia indica: a population study.

Nesokia indica, the Indian mole rat, exhibits extensive variability (polymorphism) for the constitutive heterochromatin of the X and Y chromosomes. These polymorphic X and Y types range from a large metacentric chromosome to a small acrocentric one and occur in different frequencies in the population. On the assumption that there is random mating among individuals carrying these various X and Y chromosomes, the population shows Hardy-Weinberg proportions for the genotypes. However, notwithstanding the partial or total loss of constitutive heterochromatin of the X and Y chromosomes in a few individuals, its retention in most of the animals seems obligatory to the population at large. Hence, we suggest that the C-heterochromatin plays a "regulatory" role in the population dynamics of this species.

Animals↗
PubMed1980

High frequency of Ina antigen among Iranians and Arabs.

The frequency of the Ina antigen was determined in population samples from Thailand and Indonesia as well as in Arabs, Chinese, Iranians and Parsis. It was found to be polymorphic in Arabs (11.8%) and Iranians (10.6%) while it was absent in the other population groups.

Blood Group Antigens↗
PubMedDate not supplied

Acrodermatitis enteropathica--a case report.

Acrodermatitis enteropathica is a rare disease affecting infant girls. The skin in these cases develop rashes which start as vesicles and then dries to form erythematous squamous psoriasiform type of lesions. Dystrophy of nails and alopecia with loss of eye lashes and eye brows is also seen. Low serum zinc level is found in these patients and is thought to be the cause of this disease.

Acrodermatitis↗