Article history: Received on: 05/07/2017 Accepted on: 17/08/2017 Available online: 30/09/2017 The application of different chromatographic and spectroscopic techniques to the aqueous alcoholic leaves extract of Dichrostachys cinerea (L.) Wight et Arn. (Mimosaceae) led to the isolation and identification of ten phenolic compounds. Among them, apigenin-7-O-apiosyl (1→2) glucoside, chrysoeriol-7-O...

Abstract. We define the Ladyzhenskaya-Lions exponent αl(n) = (2 + n)/4 for Navier-Stokes equations with dissipation −(−∆) in R, for all n ≥ 2. We then prove strong global solvability when α ≥ αl(n), given smooth initial data. If the corresponding Euler equations for n > 2 were to allow uncontrolled growth of the enstrophy 1 2 ‖∇u‖ L2 , then no globally controlled coercive quantity is currently ...

This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniques. The compounds 4-hydroxy-3-methoxy-benzoic acid, trans-4-hydroxycinnamic acid, and p-hydroxy-benz...

While the phytochemical composition of lentil (Lens culinaris) seeds is well described in scientific literature, there is very little available data about secondary metabolites from lentil leaves and stems. Our research reveals that the aerial parts of lentil are a rich source of flavonoids. Six kaempferol and twelve quercetin glycosides were isolated, their structures were elucidated using NMR...

Two flavonoid glycosides derived from rhamnopyranoside (1) and arabinofuranoside (2) have been isolated from leaves of Persea caerulea for the first time. The structures of 1 and 2 have been established by 1 H NMR, 13 C NMR, and IR spectroscopy, together with LC-ESI-TOF and LC-ESI-IT MS spectrometry. From the MS and MS/MS data, the molecular weights of the intact molecules as well as those of q...

We study a model for two-dimensional skyrmions on a sphere of radius L. Such model simulates a skyrmion lattice of density W/(2πL), where W is the skyrmion winding number. We show that, to a very good approximation, physical results depend only on the product αL, where α is the strength of potential term. In the range αL ∼ 3 the order parameter vanishes, there is a uniform distribution of the d...

The chromatographic fractionation of the Mauritia flexuosa L. f., Arecaceae, leaves extract, a plant known by the name of buriti palm tree, resulted in the isolation of six flavonoids: tricin-7-O-rutinoside, apigenin-6-C-arabinoside, 8-Cglucoside (isoschaftoside), kaempferol-3-O-rutinoside (nicotiflorine), quercetin-3O-rutinoside (rutin), luteolin-8-C-glucoside (orientin) and luteolin-6-C-gluco...

The ultrasonic relaxation of tellurite glasses xB2O3 – 70 TeO2 (30 x) WO3, 0 ≤ x 30 mol% was investigated by measuring the attenuation (αL) in these thermal range 140–300 K (T) at various frequencies (f). Some characteristics can be obtained from relation αL–T, such as average activation energy (Ep) and attempt frequency (f0). variables Ep f0 are a function B2O3 content. Moreover, αL–T accounts...

The features of chronic airway diseases, including chronic bronchitis, cystic fibrosis, bronchiectasis, and diffuse panbronchiolitis, include chronic bacterial infection and airway obstruction by mucus. Pseudomonas aeruginosa is one of the most common pathogens in chronic lung infection, and quorum-sensing systems contribute to the pathogenesis of this disease. The quorum-sensing signal molecul...