1. The definition and diagnosis of osteoporosis

   • B. E. C. Nordin

   Editorial Pages: 57 - 58

2. Increased trabecular bone density due to bone-loading exercises in postmenopausal osteoporotic women

   • Ariel Simkin
   • Judith Ayalon
   • Isaac Leichter

   Clinical Investigation Pages: 59 - 63

3. Occurrence of nitrogenous species in precipitated B-type carbonated hydroxyapatites

   • M. Vignoles
   • G. Bonel
   • R. A. Young

   Laboratory Investigations Pages: 64 - 70

4. Calcium phosphate saturation levels in ultrafiltered serum

   • Naomi Eidelman
   • Laurence C. Chow
   • Walter E. Brown

   Laboratory Investigations Pages: 71 - 78

5. Triamterene and renal stone formation: The influence of triamterene and triamterene stones on calcium oxalate crystallization

   • Donald J. White
   • George H. Nancollas

   Laboratory Investigations Pages: 79 - 84

6. Osteochondroma induced by reflection of the perichondrial ring in young rat radii

   • Emilio Delgado
   • José I. Rodríguez
   • Ricardo Paniagua

   Laboratory Investigations Pages: 85 - 90

7. Effects of unilateral arterial infusion of GH and IGF-I on tibial longitudinal bone growth in hypophysectomized rats

   • Anders Nilsson
   • Jörgen Isgaard
   • Olle Isaksson

   Laboratory Investigations Pages: 91 - 96

8. Bovine dentin phosphophoryn: Calcium ion binding properties of a high molecular weight preparation

   • W. G. Stetler-Stevenson
   • A. Veis

   Laboratory Investigations Pages: 97 - 102

9. Prevention of parathyroid hormone-dependent nephrocalcinosis by chronic administration of the organic phosphorothioate WR-2721

   • Susanne Hirschel-Scholz
   • Joseph Caverzasio
   • Jean-Philippe Bonjour

   Laboratory Investigations Pages: 103 - 108

10. Effects of vitamin D deficiency in the chicken embryo

    • R. Narbaitz
    • C. P. W. Tsang
    • A. A. Grunder

    Laboratory Investigations Pages: 109 - 113

11. Failure of oral calcium to enhance the acute antiosteolytic effect of calcitonin

    • Diana C. Gonzalez
    • Carlos A. Mautalen

    Letter to the Editor Pages: 114 - 115

12. Announcements

    Announcement Pages: 116 - 116

13. Serum bone gla protein (BGP) and other markers of bone mineral metabolism in postmenopausal osteoporosis

    • F. Ismail

    Erratum Pages: 117 - 117