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311 results
  • Determination of Vitamin D-dependent calcium absorption by 45Ca gavage in the rat. [Journal Article]
    J Steroid Biochem Mol Biol 2007; 103(3-5):517-20Larik R, Morris HA, O'Loughlin PD
  • Precise determination of Vitamin D-dependent intestinal calcium absorption in longitudinal studies is problematic. We have assessed Vitamin D-dependent intestinal calcium absorption by (45)Ca gavage. Rats were gavaged with a 1mL solution containing (45)Ca (CaCl(2), 9.3MBq/mL) maintained at 37 degrees C. Total Ca concentration of the gavage fluid was optimised by comparing the absorption curves fo…
  • Effect of low intensity laser irradiation on surgically created bony defects in rats. [Journal Article]
    J Oral Rehabil 2006; 33(8):619-924Nissan J, Assif D, … Binderman I
  • Low intensity lasers have been used by clinicians to improve healing and reduce pain in humans. Lasing also results in new bone formation around hydroxyapatite implants and a significant increase in the total bone area. However, the exact mechanism of cell biostimulation by laser is still unclear. This study biochemically assessed the effects of low intensity laser (Gallium-Arsenide) using 4 and …
  • Radiofrequency-induced carcinogenesis: cellular calcium homeostasis changes as a triggering factor. [Journal Article]
    Int J Radiat Biol 2005; 81(3):205-9Anghileri LJ, Mayayo E, … Thouvenot P
  • The aim was to study the effects of radiofrequency (Rf) in a mice strain characterized by age-determined carcinogenesis of lymphatic tissues. Mice were treated with a 1?h/week Rf exposure for 4 months. A group submitted to sham exposure was used as control animals. The evolution of carcinogenesis was followed up to 18 months. The maximal life span of control mice was about 24 months. All dead ani…
  • Effect of age on calcium absorption in postmenopausal women. [Journal Article]
    Am J Clin Nutr 2004; 80(4):998-1002Nordin BE, Need AG, … Horowitz M
  • CONCLUSIONS: A late age-related decrease in calcium absorption is seen in postmenopausal women in addition to the decline that occurs at menopause. This decrease could be due to a decline in either the active calcium transport or diffusion component of the calcium absorption system.
  • A longitudinal study of bone-related biochemical changes at the menopause. [Journal Article]
    Clin Endocrinol (Oxf) 2004; 61(1):123-30Nordin BE, WIshart JM, … Horowitz M
  • CONCLUSIONS: We conclude that the menopausal rise in calculated serum ionized calcium without fall in PTH, indicates a change in PTH set-point, and that the falls in gastrointestinal absorption and renal tubular reabsorption of calcium reflect the loss of an oestrogen action at these two sites. Although these changes are sufficient to explain the rise in calcium requirement at the menopause, the association of high bone resorption with normal serum PTH suggests also an increased sensitivity of bone to the action of parathyroid hormone. There is significant 'tracking' of many variables across the menopause despite very significant changes in their absolute values.
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