An efficient strategy has been developed for the synthesis of the pentasaccharide repeating unit of the cell-wall polysaccharide of Escherichia coli O166 strain through sequential stereoselective glycosylations of monosaccharide intermediates. All the glycosylation steps were high-yielding with high stereoselectivities.

Knowledge base is the way to store structured and unstructured data throughout the web. Since the size of the web is increasing rapidly, there are huge needs to structure the knowledge in a fully automated way. However fully-automated knowledge-base evolution on the Semantic Web is a major challenges, although there are many ontology evolution techniques available. Therefore learning ontology a...

We prove a formula for the number of permutations in Sn such that their first n−k entries are increasing and their longest increasing subsequence has length n − k. This formula first appeared as a consequence of character polynomial calculations in the work of Adriano Garsia, [2]. We give an elementary proof of this result and also of its q-analogue. In [2], Adriano Garsia derived as a conseque...

(i) Showing New Viewpoints (A) Facilitation, (B) Greetings, (C) Raising a problem, (D) Showing new information or viewpoints (ii) Responding Previous Utterances (E) Opinions, (F) Supplementary explanations, (G) Repeating previous utterances, (H) Giving responses (iii) Comedy Performances (I) Boke (Silly jokes), (J) Ijiri (Making fun of the others), (K) Waru-Nori (Repeating silly jokes), (L) Tsu...

Mounting evidence from observational and clinical trials indicates that optimal vitamin D reduces the risk of many diseases. We used observational studies and recent data on 25-hydroxyvitamin D [25(OH)D] concentrations of Canadians from Cycle 3 of the Canadian Health Measures Survey to estimate the reduction in disease incidence, mortality rates, and the total economic burden (direct plus indir...

A straightforward convergent synthesis has been carried out for the tetrasaccharide repeating unit of the O-specific cell wall lipopolysaccharide of the strain Sp7 of Azospirillum brasilense. The target tetrasaccharide has been synthesized from suitably protected monosaccharide intermediates in 42% overall yield in seven steps by using a [2 + 2] block glycosylation approach.

A tetrasaccharide repeating unit corresponding to the cell-wall lipopolysaccharide of E. coli O40 was synthesized by using a convergent block glycosylation strategy. A disaccharide donor was coupled to a disaccharide acceptor by a stereoselective glycosylation. A 2-aminoethyl linker was chosen as the anomeric protecting group at the reducing end of the tetrasaccharide. All glycosylation steps a...

In this paper, we present a sample of 21 repeating fast radio bursts (FRBs) detected by different instruments before September 2021. Using the Anderson--Darling test, compared distributions extra-Galactic dispersion measure ($DM_{\rm E}$) non-repeating FRBs, FRBs and all FRBs. It was found that $ DM_{\rm E}$ values three sub-samples are log-normally distributed. The $DM_{\rm repeaters non-repea...

One problem that chain format linear deduction systems can suffer from is the necessity of repeating subdeductions when unifiable literals appear in (possibly distinct) centre chains of a deduction. Four mechanisms for avoiding the repetition are : factoring, lemmas, C-literals, and caching. These mechanisms are examined, and it is concluded that lemmas and C-literals are the mechanisms of choi...