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Guliston, Uzbekistan

Avezova N.R.,Academy of Sciences of Uzbekistan | Kasimov F.S.,Academy of Sciences of Uzbekistan | Niyazov S.K.,Gulistan State University
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2010

The results of experimental field studies of thermal performance and heat efficiency of solar absorption capacious water heating collectors manufactured using local construction materials are presented. © Allerton Press, Inc., 2010. Source

Saidov A.S.,Academy of Sciences of Uzbekistan | Saidov M.S.,Academy of Sciences of Uzbekistan | Usmonov S.N.,Academy of Sciences of Uzbekistan | Leiderman A.Y.,Academy of Sciences of Uzbekistan | And 3 more authors.
Physics of the Solid State | Year: 2011

Single-crystal films of the substitutional solid solution (GaAs) 1 - x(ZnSe) x (0 ≤ x ≤ 0.80) on GaAs substrates have been grown using liquid phase epitaxy. The X-ray diffraction patterns, photoluminescence spectra, and current-voltage characteristics of the n-(GaAs)-p-(GaAs) 1 - x(ZnSe) x (0 ≤ x ≤ 0.80) heterostructures prepared have been investigated. The lattice parameters of the film a f = 5.6544 Å and the substrate a s = 5.6465 Å have been determined, and the profile of the molecular distribution of the solid solution components has been obtained. The photoluminescence spectrum of the (GaAs) 1 - x(ZnSe) x (0 ≤ x ≤ 0.80) films exhibits a narrow peak (against the background of the broad luminescence band) with a maximum in the luminescence intensity at a photon energy of 2.67 eV due to the presence of Zn-Se bonds in the structure (ZnSe is covalently bonded to the tetrahedral lattice of the GaAs matrix). It has been shown that the direct branch of the current-voltage characteristics of the structures under investigation is described by an exponential dependence I = I 0exp(qV/ckT) at low voltages (V & 0.3 V) and by a power-law dependence I ~ V α with exponents α = 4 at V = 0.4-0. 8 V, α = 2 at V = 0.8-1.4 V, and α = 1.5 at V & 2 V. The experimental results have been explained in the framework of the double-injection model for the n-p-p + structure under the condition that the concentration distribution of nonequilibrium charge carriers has a minimum. © 2011 Pleiades Publishing, Ltd. Source

Basar N.,University of Technology Malaysia | Oridupa O.A.,University of Ibadan | Ritchie K.J.,Liverpool John Moores University | Nahar L.,Liverpool John Moores University | And 5 more authors.
Phytotherapy Research | Year: 2015

Glycyrrhiza glabra L. (Fabaceae), commonly known as 'liquorice', is a well-known medicinal plant. Roots of this plant have long been used as a sweetening and flavouring agent in food and pharmaceutical products, and also as a traditional remedy for cough, upper and lower respiratory ailments, kidney stones, hepatitis C, skin disorder, cardiovascular diseases, diabetes, gastrointestinal ulcers and stomach ache. Previous pharmacological and clinical studies have revealed its antitussive, antiinflammatory, antiviral, antimicrobial, antioxidant, immunomodulatory, hepatoprotective and cardioprotective properties. While glycyrrhizin, a sweet-tasting triterpene saponin, is the principal bioactive compound, several bioactive flavonoids and isoflavonoids are also present in the roots of this plant. In the present study, the cytotoxicity of the methanol extracts of nine samples of the roots of G.glabra, collected from various geographical origins, was assessed against immortal human keratinocyte (HaCaT), lung adenocarcinoma (A549) and liver carcinoma (HepG2) cell lines using the in vitro 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazoliumbromide cell toxicity/viability assay. Considerable variations in levels of cytotoxicity were observed among various samples of G.glabra. © 2015 John Wiley & Sons, Ltd. Source

Kuchboev A.E.,Academy of Sciences of Uzbekistan | Krucken J.,Free University of Berlin | Karimova R.R.,Academy of Sciences of Uzbekistan | Ruziev B.H.,Karshi State University | Pazilov A.,Gulistan State University
Journal of Helminthology | Year: 2016

Morphological analysis of lungworms collected among Caprinae from Uzbekistan resulted in the identification of four species of Protostrongylidae: Protostrongylus rufescens, Protostrongylus hobmaieri, Spiculocaulus leuckarti and Cystocaulus ocreatus. The following species were recorded as definitive hosts: Ovis aries, Ovis ammon, Ovis vignei, Capra hircus, Capra falconeri and Capra sibirica. The prevalence of P. rufescens reached 45.3%, followed by S. leuckarti and C. ocreatus with 31.7% and P. hobmaieri with 16.9%. The sex ratio ranged between 1:3.1 and 1:6.2, with P. hobmaieri showing the strongest predominance of females over males. The prevalence of infection of small ruminants with protostrongylid nematodes increased with the age of the hosts. Protostrongyles use terrestrial gastropods as intermediate hosts, and infective larvae were found in the species Vallonia costata, Gibbulinopsis signata, Pupilla muscorum, Pseudonapaeus albiplicata, Pseudonapaeus sogdiana, Leucozonella ferghanica, Xeropicta candacharica, Candaharia levanderi and Macrochlamys sogdiana. Xeropicta candacharica was the most abundant gastropod and had the highest prevalence of infection with protostrongylids. Adult X. candacharica had a significantly higher infection intensity than juveniles. The epidemiology of protostrongylid infections is dynamic and subject to considerable changes. Further characterization of the interaction of protostrongylid parasites with their terrestrial gastropods as intermediate hosts and Caprinae as definitive hosts is required to understand these processes and to monitor the effects of changing ecological contexts. Copyright © Cambridge University Press 2016 Source

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