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A B Harper

Publications and source records attributed to A B Harper.

11 recordsLinked to original sources
PubMed1985

Bone mineral and vitamin D in Aleutian Islanders.

Serum concentrations of vitamin D metabolites (chromatography) and bone mineral status (125I absorptiometry) were examined in a group of Aleutian Islanders age 40-75 from St Paul Island, Alaska. Based on 25-(OH)D (16.6 ng/ml) vitamin D status appeared adequate. However, high concentrations of 1,25-(OH)2D (44.3 pg/ml) and very low concentrations of 24,25-(OH)2D3 (0.6 ng/ml) were found. Among females, low bone mineral levels were associated with high concentrations of 1,25-(OH)2D. A low calcium intake in these Aleutians may be responsible for high concentrations of 1,25-(OH)2D and resorption of calcium from bone.

Adult↗
PubMed1982

Physical growth of St. Lawrence Island Eskimos: body size, proportion, and composition.

Growth patterns of body size, proportion, and composition were analyzed in 57 male and 56 female Eskimos from St. Lawrence Island in the Bering Sea, ranging in age from 1.23 through 19.82 years. Age-groups means for whites and blacks of the U.S. Health Examination Survey served as reference data. Relative to HES data, the Eskimo sample were shorter with lower values for leg length, while there were no differences from the reference values for sitting height. The Eskimos also had higher values of Quetelet's Index, the sitting height/height ratio, and the upper arm muscle circumference, while there were no differences in body weight or triceps skinfold thickness. Differences from the reference data were more pronounced in males than in females. The growth patterns for size and body proportion are in conformity with known relationships between morphology and climate.

Adolescent↗
PubMed1980

[Not Available].

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Demography↗
PubMedDate not supplied

Origins and divergence of Aleuts, Eskimos, and American Indians.

The apportionment of average gene frequency differences into within and between groups of Aleuts, Eskimos and Athabascans reveals a testable model of the time of origin and differentiation of these populations. Based on the ratio of average difference between Aleuts and Eskimos, to the average difference between Bering Sea Mongoloids and Athabascans, we estimate that Athabascans diverged from Bering Sea Mongoloids at approximately 15 000 BP. The ratio of Aleut/Eskimo to Yupik/Inupiaq suggests the split between the latter occurred 5100 BP. Similarly, the within-group average gene frequency differences suggest that North American natives originated some 19 000 BP and that Bering Sea Mongoloids originated 10 200 BP. These estimates are highly concordant with independent archaeologic, linguistic and biological data.

Alaska↗