Although many methods for the determination of urea nitrogen have been described, few have proved highly convenient for the accurate determination of small amounts of urea nitrogen without having to make use of special apparatus or techniques. Among the older methods, the Van Slyke gasometric method (1) is generally considered the most accurate, with an allowable error of 1 per cent. This metho...

ALTHOUGH the importance of Fe in respiratory processes has been recognized for a long period, there are still gaps in our knowledge of the many processes in which this element is involved, e.g. very little is known concerning the absorption of Fe from the alimentary tract. The work to be described is concerned with this problem. The Wisconsin workers [Hart et al. 1928; Elvehjem, 1932] have prod...

Many investigations into the effects of malnutrition have as their background the severe calorie and protein deficiencies associated with underdeveloped countries (McCance EL Widdowson, 1968). Mr Miller has already demonstrated that the protein value of a diet is best expressed as net dietary-protein calories yo (NDpCal%), a value that can be obtained by biological assay (Platt & Miller, 1959)....

A comprehensive apatite fission-track (AFT) study of the passive margin of western peninsular India between 12‡ and 16‡N is used to reconstruct the denudation chronology of the continental hinterland. In common with other rifted margins, the morphology is characterised by a low-lying coastal plateau separated from an elevated inland plateau by an erosionally controlled escarpment (Western Ghats...

5. Friedman GD, Klatsky AL, Siegelaub AB: Lung function and risk of myocardial infarction and sudden cardiac death. N Engl J Med 294: 1071, 1976 6. Mantel N, Haenszel W: Statistical aspects of the analysis of data from retrospective studies of disease. J Natl Cancer Inst 22: 719, 1959 7. Chiang CL: Standard error of the age-adjusted death rate. US DHEW, PHS, Vital Statistics Special Reports. Se...

Numerous workers have established a connexion between the metabolism of magnesium and various dietary factors. Thus Colby & Frye (1951 b) working with young rats on a low-Mg, low-calcium diet observed reduction in blood Mg levels and increase in mortality rate when the casein content of the diet was increased from 24 to 50 yo. Increased intake of Ca salts or of phosphates has been reported to a...

Although the gross skin rash of profound zinc deficiency is well documented in patients with acrodermatitis enteropathica, glucagonoma and severe deprivation, this striking clinical manifestation is rare. Unfortunately, other clinical signs are variable and difficult to assess, and so we seek a quantitative assessment of body Zn stores (Solomons, 1979). There are two different measurements for ...

Bett, I. M. (1962). Ann. rheum. Dis., 21, 388. Biechl, A., Stapleton, J. E., Woodbury, J. F. L., and Read, H. C. (1962). Canad. med. Ass. 7., 86, 401. British Medical Association (1950). Report of Special Committee on Nutrition. B.M.A., London. Chanarin, I., Laidlaw, J., Loughridge, L. W., and Mollin, D. L. (1960). Brit. med. 7., 1, 1099. Mollin, D. L., and Anderson, B. B. (1958). Proc. roy. So...