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Hydroxyl groups (HO-) are poor leaving groups because they’re strong bases. However, if we protonate them (add acid), then we get an oxonium ion (R-OH2+). The leaving group is now H2O– a weak base and a great leaving group. The oxonium ion is much better set up to participate...
Does anybody have experience on how to categorize concentrated acids or bases in the PED fluid group system? In the PED text at http://ped.eurodyn.com/directive/directive_article9.htmlthere’s a reference to 67/548/EEC which includes corrosive fluids as being dangerous, however there is no...
While flow technology has provided a partial answer to these safety challenges38, a truly general and practical alternative for such transformation has been elusive39. Indeed, polar variants such as the Kowalsky Ester homologation suffer from the use of organolithium bases, strongly limiting the ...
The core region has a specific sequence for all known active structures and is therefore termed ‘conserved’. Conserved bases are specified explicitly, with H representing any one of {A, C, U}. A dot (∙) stands for any base that will not cause hybridisation in this position; ...
Compared with natural crRNA, chemically modified crRNA is more stable and, therefore, has equal or stronger editing efficiency [21,23,24]. Surprisingly, crRNA modified with 2′-O-methyl RNA bases, 2′-fluoro bases and phosphorothioate linkages could significantly improve the sensitivity of Cas12 ...
However, this generalization is not consistent with the behavior of Peptide Nucleic Acids (PNA), in which the heterocyclic bases are attached to a linear peptide-like backbone, since duplexes composed of RNA or DNA and PNA strands are far more stable than RNA/RNA and DNA/DNA ones. This ...
(i.e., having lower ODTs than predicted). Even the outliers can provide useful information since they help to identify and define the possible chemical bases for their particular olfactory specificity, responsible for their higher-than-expected odor potency (Abraham et al.2007b). Furthermore, ...