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A method of measuring the principal routes of calcium metabolism in man ,

, : A method of measuring the principal routes of calcium metabolism in man ,. Biochim Et Biophys Acta: 122-139

The method is based on the following techniques and theory: (I) Intravenous injection of a negligible weight of Ca45Cl2. (2) Determination of the specific activity of the serum, of the total activity in urine and stool and of the amount of ingested and excreted calcium. (3) Mathematical analysis of the curve showing the decrease of the specific activity of the serum calcium. Thus data are obtained about (a) the intestinal absorption of calcium present in food, (b) The quantity of calcium excreted by the intestinal tract, differentiated from unabsorbed calcium, (c) The rate of the physiological renewal processes of the skeleton through osteolysis and osteoblastosis. (d) The amount of readily exchangeable calcium, which is the calcium pool of the organism. This pool consists of three portions, which can be identified as clearly defined physiological entities, each having a different velocity constant of exchange with serum calcium. (e) The rate of exchange of serum calcium with these different portions of the pool. (f) The quantity of bone calcium undergoing recrystallisation. Examples are given of application of the method in man and the theory is verified in the rat. The accuracy of the described method is discussed and compared with the simplified method that is usually employed.


Other references

Ono Y., 1985: Host range geographic distribution and life cycle of puccinia grumosa uredinales. Puccinia grumosa was hitherto known from only six collections. However, seventeen additional specimens were found to be deposited in various herbaria. Examination of these twenty-three specimens shows that P. grumosa parasitizes Zigadenus colorade...

Tomasi, Ettori, 1996: First contribution to the knowledge and distribution of cecidogenous species from Friuli-Venezia Giulia. Before concluding this study, only Graffe (1905) had reported 46 gall species from the province of Triest (NE Italy). A comparison between Graffe's work and the present knowledges shows a remarkable increase: in this paper further 100 species...

Svensson, A., 1971: Driver's cabin and seat. Discusses chiefly requirements (including, e.g., adequate heating) now laid down by the Swedish Labour Inspectorate for all skidders and forwarders, and includes a list of modifications required in the most commonly used models.

Barnes, W.P., 1949: Case report; intestinal obstruction due to gallstone. Bulletin, Mcguire Clinic and St. Luke's Hospital. St. Luke's Hospital 13(1): 60-60

Turner, T.A., 2006: How to subjectively and objectively examine the equine foot. A thorough examination and assessment of the equine foot forms an essential part of pre-purchase and lameness examination. Because foot problems are the most common cause of lameness, the examiner must have an accurate knowledge of foot anatomy, f...

Garcia Martinez, M.C.; Hermenegildo, C.; Tarin, J.J.; Cano, A., 2003: Phytoestrogens increase the capacity of serum to stimulate prostacyclin release in human endothelial cells. Background. Both the estrogen receptor (ER) alpha and beta isoforms are expressed in the endothelium. The ER beta has been assigned a crucial role in normal vascular wall function. Prostacyclin has been ascribed a beneficial effect on vessel wall...

Herlyn D.; Wettendorff M.; Iliopoulos D.; Schmoll E.; Schedel I.; Koprowski H., 1988: Immunotherapy of colorectal cancer with anti idiotypic antibodies. Proceedings of the American Association for Cancer Research Annual Meeting 29: 408

Ozeki, Y.; Sooksri, V.; Ono, T.; Inoki, S., 1971: Studies on the ultra-structure of kinetoplasts of Trypanosoma cruzi and Trypanosoma gambiense by autoradiography and enzymatic digestion. Biken Journal 14(2): 97-118

Siegburg Werner, 1994: The relationship between altitude and relief intensity in high mountain drainage basins. Zeitschrift fuer Geomorphologie 38(1): 59-73

Novikova, M.I., 1974: State of hematopoiesis in monkeys at remote periods following acute irradiation. Meditsinskaia Radiologiia 19(3): 71-74