The spectra showed that Blends are being hydrolyzed, in this sense changes were observed in the
carbonyl group region (C=O) between 1750-1650 [cm.sup.-1].
The hydrogen bonding analysis from FTIR demonstrated that the limited intersegmental hydrogen bonding can occur between
carbonyl groups of the hard segments in the hard domain because most of the hard segments "dissolve" in the soft domains and scarcely hard segment can form hard domains.
According to Michell and Higgins (2002), the group around 1,730 [cm.sup.-1] is almost exclusively due to the
carbonyl groups of acetoxy groups in xylan.
C3-H appeared down field to C6-H by the lactonized
carbonyl group.
In the present work, the
carbonyl group C=O (peak A) was found at 1585[cm.sup.-1] for 0 wt.
The bands between 1717 and 1719 [cm.sup.-1] correspond to the
carbonyl group vibrations of carboxylic acids.
This suggests that the crosslinked structure originated from the reaction between the
carbonyl group and the protein could strengthen cohesion of acrylic resin molecules and endow them with hydrophobicity to some degree, despite the fact that the protein crosslinking agents themselves were hydrophilic.
Nucleophilic elbowThe Ser163 which carries out the nucleophilic attack on the
carbonyl group of TAG is a part of a more conserved structure called nucleophilic elbow.
Using the lowest energy geometries that are also capable of undergoing reaction (ones whose geometry had the
carbonyl group close enough to the hydride source and was close enough to hydrogen bond to two of the catalytic residues), only 6 were incorrectly predicted compared to 13 if the enzyme is assumed to prefer an anti-Prelog docking geometry.
The synthesis of bis(carbamoylcarboxylic) acids was developed using two different core dianhydride substrates (Figure 2), such as 3,3',4,4'-benzophenonetetracarboxylic dianhydride (1) (formally two phthalic anhydrides linked by a
carbonyl group) and 1,2,4,5-benzenetetracarboxylic dianhydride (2) (two anhydride groups with a benzene ring bridge).
Among many steroids tested, those possessing a
carbonyl group at position 3, a methyl group at 7, a hydroxyl group at positions 1, 2, 4, 11, or 19, or a saturated B ring, with or without a 4-5 double bond, were inactive.