MEDICO-BIOLOGIC RESEARCH 



(142) used microradiography in their studies 

 of the process of bone remodelling. Amprino 

 and Camanni (119), (120) studied micro- 

 radiographical patterns of dental tlisues. 



Cosslett (132), One Sing -Poen (138), 

 Grampp and Hallen (133), Istok et al (135) 

 discussed several questions pertaining to the 

 technique of the contact and projection 

 microradiography. 



Acknowledgment. The work on microradiog- 

 raphy in general and on microradiography of 

 aging bone in particular has been started with the 

 financial and moral support of the University of 

 Ottawa. Afterwards it was supported by grants 

 of the Atkinson Charitable Foundation (Toronto, 

 Canada), Canadian Arthritis and Rheumatism 

 Society, National Research Council of Canada, 

 James Picker Foundation, and is supported now 

 by the USA Public Health Service (Research 

 grant No. A-2298). 



I express my sincerest gratitude to all these 

 organizations. 



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