SIGBIO Newsletter then characterize the important transitions in biological systems. The major scientific w o r k s are those which simultaneously propose a new framework and produce p o w e r f u l theorems in this framework. Conrad's Adaptability both opens a field and conquers it. The book should prove a l a n d m a r k in theoretical biology. Page 13 PH.D. THESES The four PhD abstracts were forwarded to SIGBIO Newsletter by Susanne H u m p h r e y of the National Library of Medicine. The proposal by Glenn Rennels was copied f r o m the IRList (an electronic newlsetter for Information Retrieval work) by Roy Rada. AN University Microfilms Order Number ADG85-06173. 8507. AU COOPER, GREGORY FLOYD. IN Stanford University Ph.D. 1985, 252 pages. TI NESTOR: a computer-based medical diagnostic aid that integrates causal a n d probabilistic knowledge. SO DAI V46(01), SecB, pp243. DE Engineering, Biomedical. AB In order to address some existing problems m making, TC in hy fin dis t h a t should be applicable to other medical areas. knowledge-based methods within a formal probability theory framework. The tasks are as follows: (1)
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