DEREK

Hassel shared the 1969 Nobel Prize in chemistry with Sir Derek Barton of Imperial College (London) Barton demonstrated how Hassel s structural results could be extended to an analysis of conformational effects on chemical reactivity... 

The concept of an invisible college , mentioned by Ziman, is the creation of Derek de Sofia Price, an influential historian of science and herald of scientomet-rics (Yagi et al. 1996), who wrote at length about such colleges and their role in the scientific enterprise (Price 1963, 1986). Price was one of the first to apply quantitative... 

Professors Derek Hull, Colin Humphreys and Alan Windle of my Department in Cambridge have successively provided ideal facilities that have enabled me to devote myself to the preparation of this book. My thanks go to them. 

Jaap Hogeling (9) ISSO, 3000 BV Rotterdam, The Netherlands Derek Ingham (10, 13) Department of Applied Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom... 

Anti periplanar geometry for E2 reactions is particularly important in cyclohexane rings, where chair geometry forces a rigid relationship between the substituents on neighboring carbon atoms (Section 4.8). As pointed out by Derek Barton in a landmark 1950 paper, much of the chemical reactivity of substituted cyclohexanes is controlled by their conformation. Let s look at the E2 dehydro-halogenation of chlorocyclohexanes to see an example. 

Backbone (protein), 1028 Backside displacement. reaction and.363-364 von Baeyer, Adolf, 113 Baeyer strain theory, 113-114 Bakelile, structure of, 1218 Banana, esters in, 808 Barton, Derek, H. R., 389 Basal metabolic rate, 1169 Basal metabolism. 1169-1170 Base, Bronsted-Lowry, 49 Lewis, 57, 59-60 organic, 56-57 strengths of, 50-52 Base pair (DNA), 1103-1105 electrostatic potential maps of. 

Derek H.R. Barton and Odd Hassel development of the concept of conformation and its application in chemistry... 

Selected Papers of Derek H. R. Barton by Derek H. R. Barton... 

A number of commercial expert systems have been applied to screen drug libraries. For instance, DEREK, TOPKAT, MultiCASE, and many other systems all have possibilities in this regard. However, it should be noted that for broad screening only compounds with toxicity associated with them can be identified, and hence these are very crude measures of hazard assessment. The use of expert systems to screen libraries is fraught with dangers, not least that no performance statistics are available for these systems being used for such an application. It is also highly probable that the vast majority of predic-... 

Although DEREK cannot of itself handle metabolism, a sister program, METEOR [97], allows the prediction of metabolites, which can then be assessed by DEREK. 

Greene N, Judson PN, Langowski JJ, Marchant CA. Knowledge-based expert systems for toxicity and metabolism prediction DEREK, StAR and METEOR. SAR QSAR Environ Res 1999 10 299-314. 

TSUTOMU TSUCHIYA, KENJI MAEDA, AND DEREK HORTON... 

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