728 



Diffusion control, enamel dissolution, 



251 

 Diffusion gradients, enamel dissolu- 

 tion, 236 

 Diffusion pathways, enamel, 221, 249 

 Diffusion of radioactive isotopes, 



enamel, 249 

 Diffusion rate, heterogeneous reaction, 



214 

 Digestive system, hibernation, 285 

 Dihydrogen form, phosphate, 585 

 Dihydrotachysterol, bone resorption, 



631 

 Dinitrophenol, inhibition of resorption, 



615 

 Diphtheroids, oral flora, 270 

 Diploe, resorption, 483 

 Diploic spaces 



hyperparathyroid animals, 485 

 parietal bone, 481 

 resorption, 484 

 Diphria, 39 

 Direct bone action 



parathyroid hormone, 589, 609 

 vitamin A, 627 

 vitamin D, 631 

 Disc-shaped erosion of teeth, 102 

 Disodium ethylenediamine tetraace- 

 tate, see EDTA 

 Dispersed state, collagen, 667 

 Dissolution 



calcareous substrate, 34 



calcified tissues, chemical factors, 



376 

 calcium carbonate, 68 

 infected bone, 646 

 tooth substance, 99 

 Dissolution of calcareous rock, 20 



pH, 34 

 Dissolution of shell 

 acids, 55 

 CO2, 55 

 enzymes, 55 

 sequestering agents, 55 

 Division of Biology and Medicine, 

 United States Atomic Energv 

 Commission, 554 



SUBJECT INDEX 



Dogs 



bone biopsies, 533 



parathyroid extract, 532, 543 

 Dorsal spine, collapse, 388 

 Dosinia discus, 62, 67, 71, 73, 86 

 Drilling gastropods, demineralization- 

 boring mechanism, 56 



see also ABO 

 Drilling site, snails, 57 

 Dutch shell disease, 2 

 Dye-binding capacity 



enamel, 149 



rehardened enamel, 139 

 Dye penetration, Retzius lines, 140 

 Dynamics 



carious lesion formation, 244 



heterogeneous system, 257 



Early caries, microradiography, 175 

 Early diagnosis, osteoporosis, 422 

 Earthquake shocks, coral block frac- 

 ture, 47 

 East Indian coral reefs, erosion, 5 

 Easter Seal Foundation, 440 

 Eastern oysters, 61 

 Eating habits, caries control, 278 

 Eating patterns, older individuals, 267 

 Echinoderms, 1 

 Echinoid echinoderms, 4 

 Echinometra mathaei, 5 

 Ecology, reef coral, 27, 35 

 Ectocranial resorption, 485 

 EDTA (ethylenediamine tetraace- 

 tate), 214 



infusion of, 533 

 EDTA-bound calcium, plasma, 533 

 EDTA inhibition, collagenase, 685 

 EDTA venoclysis, 545 

 Egg capsule, 81 

 Egypt, ancient teeth, 120, 126 

 Elaphurus davidianus, 347 

 Elasmobranchs, placoid scales, 339 

 Elastase, collagen digestion, 685 

 Eld's deer, antlers, 347 

 Electron micrographs 



aragonite surface, 83 



bone matrix, 505 



calcite surface, 83 



