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Saien J.,Bu - Ali Sina University | Shahrezaei F.,Academic Center for Education Culture and Research
International Journal of Photoenergy | Year: 2012

A real petroleum refinery wastewater, containing a range of aliphatic and aromatic organic compounds, was treated using nanotitania particles, as the photocatalyst in UV/TiO 2 process. Samples were collected from the inlet point of the biological treatment unit. A conic-shape, circulating, and upward mixing reactor, without dead zone, was employed. The light source was an immersed mercury UV lamp (400W, 200550nm). Optimal suspended catalyst concentration, fluid pH, and temperature were obtained at amounts of near 100 mg L. © 2012 I. Salas-Garca et al. Source

Hafezi M.,Iranian Materials and Energy Research Center | Reza Talebi A.,University of Yazd | Mohsen Miresmaeili S.,Academic Center for Education Culture and Research | Sadeghian F.,University of Yazd | Fesahat F.,University of Yazd
Ceramics International | Year: 2013

There is a conspicuous need for in vivo evaluation of biomaterials prior to their application as bone graft or tissue engineering scaffold. Merwanite and HA in vivo application as bone filler would be studied in this study. Femoral injury was induced in male rats and early and late degrees in bone repair were evaluated. A histomorphological analysis of the bioceramics implants in rat femoral defect models suggested that both in early and late stage of bone repair, merwinite is more effective in promoting osteogenesis in comparison with HA and in late stage, the rate of new bone formation was faster in merwinite-filled-bone-defect than in HA models. The control groups showed limited osteogenesis. These results suggested that merwinite might be a potential and attractive bioceramic for bone replacement. © 2012 Elsevier Ltd and Techna Group S.r.l. Source

Kazemizadeh Z.,Academic Center for Education Culture and Research | Moradi A.,Agricultural and Natural Resources Research Center of Iran | Yousefi M.,Shahid Beheshti University
Journal of Medicinal Plants | Year: 2011

Background: The genus Achillea (Asteraceae) is comprised of about 115 species in over the world. Remarkably, 19 species of this genus are found in the flora Iranica. This genus has been used in folk medicine. Objective: Investigation of the essential oil from leaf and flowers of Achillea nobilis L. subsp. neireichii. Methods: The aerial parts of A. nobilis L., subsp. neireichii were collected during the flowering stage from Damash village, West of Roodbar, Gilan Province, in July 2007. Leaves and flowers were separately hydrodistilled for 3 hours, using a Clevenger-type apparatus to yield 1.8% (w/w) and 1.0% (w/w) of yellow oil, respectively and analyzed with GC and GC/MS. The constituents of the essential oil were identified by comparison of their mass spectra and retention indices (RI) with those given in the literature, co-injection and authentic samples. Results: Forthy-four (86.8%) and forthy - two (93.4%) compounds were characterized in the oil of flowers and leaves of A. nobilis subsp. neireichii, respectively. 1,8-cineole (10.3%) and geranyl isovalerate (8.4%) were the major constituents in the oil of the flowers, also 1,8-Cineole (17.0%) and trans-verbenol (14.1%) were the major constituents in the oil of leaves. Conclusion: The oil of flowers and leaves of A. nobilis subsp. neireichii consist of monoterpens (59.8% and 72.2%) and sesquiterpens (22.2% and 12.6%), respectively. Source

Kazemizadeh Z.,Academic Center for Education Culture and Research | Habibi Z.,Shahid Beheshti University
Journal of Medicinal Plants | Year: 2010

Background: The genus Teucrium (Lamiaceae) is comprised 340 species in widespread over the world. Remarkably, In the Flora Iranica this genus is represented by twelve species, three of which are endemic. The genus Teucrium are known for medicinal value, antibacterial, antioxidant, anti-inflamatory, antiseptic and antipyretic properties. Objective: Isolation of β-Stigmasterol from Teucrium hyrcanicum L. Methods: The aerial parts of Teucrium hyrcanicum were collected during the flowering stage from Rostamabad, Gilan Province, in July 2006 and then were extracted by chloroform and acetone (2:1) for 36 h. Crude extract was separated by adsorption chromatography over silica gel with elution by petroleum and ethylacetate. Final purification was performed by smaller chromatography. Results: A steroid named β - Stigmasterol were isolated and the structur of them were proved using spectral data consist of FTIR, UV, HRMS, also 1-DNMR ( 1HNMR, 13CNMR), 2-DNMR (HMQC, HMBC) and DEPT (90°,135°). Conclusion: β-Stigmasterol was characterized for the first time in Teucrium hyrcanicum. Source

Shahmiri M.,University Putra Malaysia | Ibrahim N.A.,University Putra Malaysia | Shayesteh F.,National University of Malaysia | Asim N.,National University of Malaysia | Motallebi N.,Academic Center for Education Culture and Research
Journal of Materials Research | Year: 2013

Copper oxide (CuO) nanosheets synthesized in polyvinylpyrrolidone (PVP) were characterized with respect to antimicrobial activity by quick precipitation method. Different sizes and shapes of CuO nanosheets were obtained by simple variations of PVP concentrations. The x-ray diffraction results revealed the formation of pure-phase CuO with monoclinic structure. Transmission electron microscopy analysis showed that the average ratio of length to width of these nanosheets increased with increasing PVP concentrations. Due to the quantum size effect, CuO nanosheets exhibit a blue shift in the ultraviolet-visible spectra. Field emission scanning electron microscopy results showed that as the concentration of PVP increased, well-defined morphologies were formed on the surface of the products. Energy dispersive analysis of x-ray clearly confirmed the presence of Cu and O with an atomic ratio of 1:1. Fourier transform infrared spectroscopy results showed that C=O in PVP coordinated with CuO and formed a protective layer. The mechanism of the reaction was also discussed. CuO nanosheets in suspension showed activity against a range of bacterial pathogens and fungi with minimum bactericidal concentrations (MBCs) ranging from 100 to 5000 μ/mL. The extent of the inhibition zones and the MBCs was found to be size-dependent. Copyright © Materials Research Society 2013. Source

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