The immune system is characterized by the preferential migration of lymphocytes through specific tissues (i.e., tissue tropism). Tissue tropism is mediated, in part, by the α(4) integrins expressed by T lymphocytes. The α(4)β(1) integrin mediates migration of memory T lymphocytes into the CNS, whereas the α(4)β(7) integrin mediates migration preferentially into gastrointestinal tissue. This par...

β-1,3:1,4-Glucan is a major cell wall component accumulating in endosperm and young tissues in grasses. The mixed linkage glucan is a linear polysaccharide mainly consisting of cellotriosyl and cellotetraosyl units linked through single β-1,3-glucosidic linkages, but it also contains minor structures such as cellobiosyl units. In this study, we examined the action of an endo-β-1,3(4)-glucanase ...

a mild and efficient method has been developed for the preparation of substituted coumarins from reaction of various phenols with different β-ketoesters via pechmann condensation in the presence of brønsted acidic ionic liquid (n-(4-sulfonic acid) butyl triethylammonium hydrogen sulfate) as an effective catalyst under solvent-free conditions. different phenols reacted with ethyl acetoacetate to...

Light-induced molecular piping of cyclic peptide nanotubes to form bent tubular structures is described. The process based on the [4+4] photocycloaddition anthracene moieties, whose structural changes derived from interdigitated flat disposition precursors corresponding cycloadduct induced geometrical modifications in packing that provokes their curvature. For this purpose, we designed a new cl...

Starting from allyl 2-O-acetyl-3-O-benzyl-α-l-rhamnopyranoside (3), allyl (2,3,4,6-tetra-O-benzoyl-β-d-galactopyranosyl)-(1→4)-2-O-acetyl-3-O-benzyl-α-l-rhamnopyranoside (5) was synthesized under Helferich conditions. Module 5 was converted to 2,3,4,6-tetra-O-benzoyl-β-d-galactopyranosyl-(1→4)-2-O-acetyl-3-O-benzyl-α-l-rhamnopyranosyl bromide (8) which was then coupled with methyl (allyl 2,3-di...

Three new sesquiterpene glycosides, possessing a rare aglycone with a sulfonyl between C-1 and C-15 positions, named 3-(3'E-7'R,8'-dihydroxy-4',8'-dimethyl-3'-nonenyl)-2,5-dihydro-1,1-dioxo-thiophen 7'-O-β-d-glucopyranosyl-(1→4)-O-β-d-glucopyranosyl-(1→4)-O-β-d-glucopyranoside (1), 3-(3'E-7'R,8'-dihydroxy-4',8'-dimethyl-3'-nonenyl)-2,5-dihydro-1,1-dioxo-thiophen 7'-O-β-d-glucopyranosyl-(1→4)-O-...

Representative hemicellulose, milled wood lignin (MWL), and cellulose were directly separated from corn stalk, their main chemical content was determined using NREL methods. The elements, groups, molecular structure of stalk biomass components (hemicellulose, MWL, cellulose) analyzed by elemental analysis, Fourier transform infrared, nuclear magnetic resonance spectroscopy analyses．The results ...

This study aimed to elucidate the chemical response of hairy vetch (Vicia villosa Roth) interspecific competition by rye (Secale cereale L.). Hairy plants were grown as target in a mixture with different densities (0, 1, 2, and 4). Twelve flavonoids shoot, root, root exudate quantified high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Kaempferol 3-O-{β-D-rhamnosyl-(1...