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Biomedical subjects

L Hambraeus

Publications and source records attributed to L Hambraeus.

At least 73 records · Page 4Linked to original sources
PubMed1976

A longitudinal study of the protein, nitrogen, and lactose contents of human milk from Swedish well-nourished mothers.

The contents of total nitrogen, nonprotein nitrogen, lactose, and individual milk proteins have been determined in human milk from well-nourished Swedish mothers. Breast milk samples from 50 mothers at different stages of lactation (up to 170 days) were collected. Furthermore, three mothers gave samples repeatedly throughout the whole lactation period. The protein content in mature milk was found to be 0.8 to 0.9% by amino acid analysis. The nitrogen content and the contents of the major human milk whey proteins, alpha-lactalbumin and lactoferrin, are very high for the first few days, then decrease rapidly and reach, thereafter, the more slowly declining level of mature milk. Nonprotein nitrogen and the nonspecific milk protein serum albumin are present in constant concentrations throughout lactation. The daily milk volumes were determined and found to be 500 to 600 ml in the very early part and 700 to 800 ml in the later part of the lactation period.

Female↗
PubMed1976

Breast milk composition in Ethiopian and Swedish mothers. II. Lactose, nitrogen, and protein contents.

Breast milk from underprivileged and privileged Ethiopian mothers was collected at different stages of lactation and analyzed for total nitrogen, nonprotein nitrogen, lactose, and individual milk proteins (lactoferrin, alpha-lactalbumin, serum albumin, IgG and IgM). These values and the milk volume of one meal were compared to corresponding results from well-nourished Swedish mothers. No significant differences between the levels of these constituents or the milk volumes were found between the two groups of Ethiopian mothers. When comparison was made between breast milk from these two Ethiopian groups and the Swedish group, the former two showed significantly higher values for the iron-binding protein lactoferrin.

Ethiopia↗
PubMed1976

Regulatory role of dietary leucine on plasma branched-chain amino acid levels in young men.

Four healthy young men were studied to explore the effects of dietary leucine intake on plasma levels of leucine,isoleucine and valine. Leucine-, valine-, leucine-valine-, and leucine-isoleucine-valine-free amino acid mixtures were studied during four-day experimental diet periods. The effects of giving amino acid mixtures with high-carbohydrate, low-fat or low-carbohydrate, high-fat diets were also studied. Deficient leucine intake increased plasma levels of valine and isoleucine, but a valine-free diet did not affect plasma levels of the other branched-chain amino acids. Leucine influence was evident during the postprandial and fasted phases. Valine and isoleucine levels were less markedly reduced when diets devoid of these amino acids were also leucine-free, as compared with a diet providing adequate leucine. Changes in the major dietary energy source failed to influence the qualitative effects of dietary leucine adequacy on the branched-chain amino acid levels in plasma. The results suggest that leucine facilitates both tissue uptake of branched-chain amino acids and their intracellular metabolism.

Adolescent↗