However, the evaluation period proved to be insufficient to reach the equilibrium between the amidic
and nitric forms (Figure 5).
As SOM pools in BF can be assumed to be older than in the other treatments due to the lack of fresh SOM input, we conclude that increasing aromaticity and decreasing hetero-aliphatic (together with amidic
for the region of methoxyl and N-alkyl groups) properties are indicators for aged and probably stabilised SOM under the given conditions.
As heteroatoms other than oxygen are concentrated into the composition of acetone solubles, the presence of pyrrolic, pyranic, sulphoxidic, metallorganic, letcitinic and other phospholipidic, tioketonic, tioalcoholic, tioureatic, amidic
, and many other fragments containing one or more heteroatoms in the form of remnants, substitutes, derivation or recombination products in this fraction is probable.
In the IR spectra of our target compounds (5a-5n), the band around 1580-1620 cm-1 could be attributed to C=N stretching vibrations and the intense absorption bands appearing around 1670 cm-1 could be assigned to amidic
C=O stretching vibration of N-acyl substituted pyrazoles.
2])], when added to the soil, suffers enzymatic hydrolysis, which transforms the N present in the amidic
form into ammonium ion (N[H.
1], specific to amidic
NH and C=0 group from the amide linkage, have disappeared entirely, indicating the completion of thermal imidization of the intermediate poly(amic acid) into final polyimide.
Ceramides (sphingolipids) are molecules having: a sphingoid amidic
base (14-22), and are mostly decorated with hydroxyl functions and carbon-carbon double bond (s), attached to a long chain fatty acid (14-30 carbon atoms), which may saturated or unsaturated .