substitution group

substitution group

[‚səb·stə′tü·shən ‚grüp]
(mathematics)
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The high substitution group consisted of pharmacists who indicated they would dispense generic substitutes for 21 or more products, the low substitution group consisted of those who indicated they would dispense substitutes for 16 or less products, and the medium substitution group consisted of the remaining respondents.
The independent variable in each was substitution group. Dependent variables were, for the first MANOVA, dimensions of probability of risk; for the second MANOVA, dimensions of importance of risk; for the third, dimensions of probability of benefit; and for the fourth, dimensions of importance of benefit.
MANOVA indicated that perceived probability of risk was significantly different across the three substitution groups (Wilks' criterion; F = 4.03, df = 10, 776, p = .001).
The MANOVA indicated significant differences across the three substitution groups (Wilks' criterion; F = 2.54, df = 10, 774, p = .005).
However, mean scores for the substitution groups on this item only ranged from 2.7 to 3.2.
Comparing with the unsubstituted molecule F1, the effect of substitution groups added on the thiophene rings is clearly seen.
However, the gap energy decreases with these substituents; this can be due to the electron donating of (methoxy and methyl) and electro[pi]-accepting (C=S and C=C[(CN).sub.2]) substitution groups. The band gap of F5 and F6 is much smaller than that of the other compounds.
Production of cellulose derivatives is done by reacting the free hydroxyl groups in the anhydroglucose units(AGU) with various chemical substitution groups. The introduction of the substituent disturb the inter- and intramolecular hydrogen bonds in cellulose, which leads to liberation of the hydrophilic character of the numerous hydroxyl groups and restriction of the chains to closely associate (Togrul and Arslan, 2003).
`Certainly there are plays and concepts and substitution groups that we don't want them to see or get any inkling of and sometimes you don't know who to trust.'
Their major functions, basic structures, substitution groups and nomenclature are set out.