91 Kirchgessner, M., Munz, W. & OeIscWiger, W. (1960) . Arch. Tierwnuhr. 10, I . Marston, H. R. (1970). B7.J Nzitr. zq, 615. Mills, C. F. (editor) (1970). Trace Element Metabolism in Animals. Edinburgh: Livingstone. Mills, C . F., Dalgarno, A. C., Williams, R. B. & Quarterman, J. (1967) . BY.?. Nutr. 21, 7 5 1 . National Research Council (1960) . Publs natn. Res. Coun., Wush. no. 827. National Research Council (1964) . Publs natn. Res. Cozm., Wash. no. I 192. National Research Council (1966) . Publs natn. Res. Coun., Wash. no. 1349. National Research Council ( 1 9 6 8 ~ ) . Publs natn. Res. Coun., Wash. no. 1694. National Research Council (1968b). Publs natn. Res. Coun., Wash. no. 1693. National Research Council (1970). Publs natn. Res. Coun., Wush. no. 1137, 4th ed. Oberleas, D. & Prasad, A. S. (1970). In Truce Element Metabolism in Animals p. 170 [C. F. Mills, editor]. Edinburgh: Livingstone. Ott, E. A,, Smith, W. H., Stob, M., Parker, H. E., Harrington, R. B. & Beeson, W. M. (1965) . J. Nutr.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT3-Heptanone vs. 4-methyl-2-pentanone as extracting solvents in atomic absorption spectrophotometryR. J. Everson and H. E. ParkerCite this: Anal. Chem. 1974, 46, 13, 2040–2042Publication Date (Print):November 1, 1974Publication History Published online1 May 2002Published inissue 1 November 1974https://pubs.acs.org/doi/10.1021/ac60349a030https://doi.org/10.1021/ac60349a030research-articleACS PublicationsRequest reuse permissionsArticle Views98Altmetric-Citations13LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of hydrogen ion concentration on the determination of lead by solvent extraction and atomic absorption spectrophotometryR. J. Everson and H. E. ParkerCite this: Anal. Chem. 1974, 46, 13, 1966–1970Publication Date (Print):November 1, 1974Publication History Published online1 May 2002Published inissue 1 November 1974https://pubs.acs.org/doi/10.1021/ac60349a033https://doi.org/10.1021/ac60349a033research-articleACS PublicationsRequest reuse permissionsArticle Views67Altmetric-Citations17LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

Eight-hydroxy-quinoline-agarose was prepared by the synthesis of 5-nitroso-8-hydroxy-quinoline and reduction to 5-amino-8-hydroxy-quinoline followed by cyanogen bromide coupling to agarose. The binding of zinc to 8-hydroxy-quinoline-agarose was studied by equilibrium dialysis. The data were evaluated by a Schatchard plot indicating an association constant of 0.60 × 109 mole−1 liter. This compares with a reported association constant of zinc to 8-hydroxy-quinoline in 50% dioxane of 9.12 × 109 mole−1 liter.

Une diète contenant 2.8% de méthionine a réduit la croissance et l'activité thyroïdienne du rat. La restriction de nourriture appliquée à des rats normaux a donné des résultats comparable. L'augmentation de la cystine dans cette diète pour obtenir le même taux de soufre n'a pas altéré la croissance ou l'activité thyroïdienne comparée à celle des rats normaux. En conclusion, la réduction de l'activité thyroïdienne des rats recevant un excès de méthionine est due à une insuffisance de nutrition.

Evidence in this report indicates that copper is directly involved in the process of collagen cross-linking. The bones from chicks fed copper-deficient diets became brittle and fragile. The collagen in copper-deficient bone was more easily extracted and contained less total aldehyde than corresponding controls. After chromatography on CM-cellulose columns and acrylamide gel electrophoresis, monomer or α-collagen and the cross-linked dimer, β-collagens, could be separated and quantitated. The α to β ratio of collagen from copper-deficient bone was approximately twice that of collagen from control bone, indicating a decrease in the cross-linking.

In rats fed a magnesium-deficient diet, there was slight but statistically significant (P < 0.05) increase in thyroid size when expressed as milligrams of thyroid per 100 gm of body weight. The thyroid glands of magnesium-deficient rats contained more I131, 24 hours after injection of 10 µc of KI131, than those of rats fed higher levels of magnesium in the diet. The PBI131 level and the ratio of PBI131 to total I131 in plasma was not significantly altered (P > 0.05) by the dietary level of magnesium. Analysis of paper chromatograms of pancreatin hydrolysates of thyroid gland tissue excised from magnesium-deficient rats and incubated with I131 showed that the amount of I131-labeled tyrosines and thyronines was not significantly influenced by the magnesium level in the incubation medium. The results are discussed on the basis of a hypothetical need for an optimal balance between thyroxine and magnesium in the regulation of thyroid function.

ALMQUIST (1942), working with a washed casein, cerelose-type diet containing 40 p.p.m. of magnesium, reported that the addition of 350 p.p.m. of supplemental magnesium produced as good growth rates as any higher level. The author concluded that 350 p.p.m. was a barely adequate supplementary level and stated that the requirement during the first weeks of life was approximately 400 p.p.m. The deficiency symptoms that were observed included convulsions, gasping and a coma which sometimes was fatal but usually ceased in a few minutes.

KERNKAMP (1925) and Welch (1928) were the first to describe goiter in poultry in the United States. Hamilton and Kirk (1930), Forbes (1932), and Holmes et al. (1934) were unable to increase growth rate by iodine supplementation of the chick diet; the diet used by Forbes contained 1,000 p.p.b. iodine, while that of Holmes contained 500 p.p.b. No analyses are quoted by Hamilton and Kirk, but their diet undoubtedly contained considerable iodine because of the high content of meat products used.

With rats grown for three successive generations on diets containing 25 to 525 μg of iodine per kilogram, the minimum dietary level needed to prevent thyroid enlargement was found to lie between 100 and 225 μg per kilogram. The growth rates of rats fed the different levels of iodine did not differ significantly.