We find that besides structural disorder those matrix atoms with dangling and floating bonds contribute to energy levels close to the Fermi level.
From a comparative analysis of calculated optical spectra we conclude that the difference in optical properties between crystalline and amorphous silicon nitrides-either hydrogenated or unhydrogenated-is only small. It is present mainly in the energy range close to the fundamental band gap. At larger energies the difference is negligible. It is found that the structural disorder in silicon nitrides investigated does not affect essentially the electronic structure and optical properties of these materials. It is concluded that such amorphous silicon nitrides can be used instead of their crystalline counterparts for various applications in which optical properties of such materials are important.”
“Red and sugar maple leaves collected in the summer and fall from SNDX-275 Canada, were evaluated for phenolic content, antioxidant, alpha-glucosidase,
and alpha-amylase inhibitory activities variation. The phenolic contents of summer red maple leaves (RML-S) and summer sugar maple leaves (SML-S) were higher than red and sugar maple leaves collected in fall (RML-F and SML-F, respectively). HPLC analyses showed differences in phenolic compounds present in the SML samples compared to the RML samples. The extracts were assayed for yeast and rat alpha-glucosidase inhibitory this website activities. Both results showed that SML-S extracts had the highest inhibitory activity which could possibly be attributed to the unique phenolics present therein. Milder effects were observed in terms of alpha-amylase inhibitory activity, with RML-F having the highest inhibitory activity. These results suggest that maple tree leaf extracts may have potential for phenolic-mediated alpha-glucosidase inhibition, check details relevant to type 2 diabetes management, with SML-S extract having the highest bioactivity.”
“A series of polyurethane (PU) polymers cross-linked laterally by pentaerythritol and polyethyleneglycol (PEG) spacers were compared with linear PU. The PU was composed
of 4,4′-methylenebis(phenylisocyanate) (MDI), poly(tetramethyleneglycol), 1,4-butane-diol (BD), pentaerythritol, and PEG-200 as a spacer. PEG-200 connected the pentaerythritol hydroxyl groups of two PU chains with MDI as a connecting agent. The phase separation between hard and soft segments was disrupted by the PEG crosslinking, and T did not change with an increase in cross-linking content. Instead, the cross-link density increased with an increase of pentaerythritol content. A significant increase in maximum stress compared with linear PU was attained, together with an increase in strain. The combination of both pentaerythritol and PEG-200 in the PU resulted in the improvement of both stress and strain, unlike in the conventional cross-linking method.
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