Diglycose derivatives, consisting of two monosaccharides linked at non-anomeric positions by a bridging nitrogen atom, have been synthesised. Conversion of one of the precursor monosaccharide coupling components into an unsaturated derivative enhances its electrophilicity at the allylic position, facilitating coupling reactions. Mitsunobu coupling between nosylamides and 2,3-unsaturated-4-alcoh...

We study the behavior of max-algebraic powers of a reducible nonnegative matrix A ∈ Rn×n + . We show that for t ≥ 3n2, the powers At can be expanded in max-algebraic sums of terms of the form CStR, where C and R are extracted from columns and rows of certain Kleene stars, and S is diagonally similar to a Boolean matrix. We study the properties of individual terms and show that all terms, for a ...

Bisulfite catalyzes transamination of cytidine at the N4 position; the suitability of this reaction for attaching reporter groups to selected cytidine residues in RNA molecules has been investigated. Poly(C) is nearly quantitatively converted to the poly (N4 aminoethyl-C) derivative after 3 hrs at 42 degrees C with ethylene diamine (pK1 = 7.6) and bisulfite. This derivative reacts quantitativel...

0196-4399/00 (see frontmatter) © 2010 Elsevier Clinical Microbiology Newsletter 32:5,2010 The following describes our experience in developing an improved medium for the detection of Salmonella and Shigella species in clinical specimens. Initially, we attempted to build on past improvements of enteric plating agars containing the surfactant Niaproof 4, formerly known as Tergitol 4. However, des...

Introduction. Coronavirus disease 2019 (COVID-19) is an infectious caused by the SARS-CoV-2 virus (severe acute respiratory syndrome-related coronavirus 2). COVID-19 now expected to stay with us for many years as a recurring disease. Molnupiravir and favipiravir are oral antiviral drugs anti-RNA polymerase activity. The Russian Health Ministry has approved molnupiravir treatment of COVID-19. st...

Instant noodles originated in eastern nations and have been accepted due to its practicality low cost. However, high sodium content can lead health problems. The present study aimed reduce increase calcium levels noodles. A control (N1: K2CO3+ Na2CO3) three treatments with the addition of carbonate combination alkaline salts such as potassium carbonates (N2: CaCO3; N3: Na2CO3+ N4: CaCO3) were s...

Color induction in nitrogen-contaminated diamonds was carried out via various procedures that involve irradiation, thermal treatments (annealing), and more. These affect vacancy defect production atom orientation centers the diamond lattice. Natural underwent color enhancement order to produce green, blue, yellow fancy diamonds. The aim of this study follow changes occurring during treatment, m...