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J C Dearden

Publications and source records attributed to J C Dearden.

18 recordsLinked to original sources
PubMed1991

The QSAR prediction of melting point, a property of environmental relevance.

Melting point is an important environmental parameter, since it affects solubility. The melting point of a compound is controlled primarily by intermolecular forces and molecular symmetry. This study shows that it is possible to predict the melting points of a series of 42 anilines quite well (r = 0.941, s = 24.6) by an equation containing five parameters; namely a measure of hydrogen bond donor ability, the hydrophobic substituent constant, molar refractivity, the Sterimol width parameter B2 and an indicator variable for m-substitution.

Aniline Compounds↗
PubMed1991

Correlation of tumour-inhibiting activity with acute toxicity.

We have developed predictive equations for the anti-carcinogenic activity of 21 phenolic anti-oxidants against forestomach tumours in mice. One of these equations was then used to predict the anti-carcinogenic activity of a further 25 phenolic compounds. It was found that anti-carcinogenic activity correlated well with acute toxicity to the fathead minnow.

Animals↗
PubMed1991

QSAR studies of comparative toxicity in aquatic organisms.

This study investigated the relationships between the toxicities of common organic pollutants to the fathead minnow (Pimephales promelas), to Daphnia magna, to Tetrahymena pyriformis and in the Microtox test, which uses the luminescent bacterium Photobacterium phosphoreum. The toxicity data were compiled from the literature, with the exception of 40 experimentally determined Microtox data. Encouraging correlations are seen, indicating significant relationships between fish toxicities and those to lower organisms. When the toxicities of individual chemical classes are studied, further improvement is often seen in the correlations. Analysis of significant outliers from the inter-species relationships has led to the suggestion that the fathead minnow may be more susceptible to chemicals that are metabolised to reactive intermediates (such as the aldehydes). The fish may, however, be less susceptible to other chemical classes such as ketones and alcohols.

Animals↗