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Search Results: 1 - 10 of 434222 matches for " S.H. Navidpour "
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A New Species of Psammophilic Scorpion From Iran (Scorpions: Buthidae)
S.H. Navidpour
Journal of Biological Sciences , 2008,
Abstract: In order to study the psammophilic scorpions of sandy habitats of two provinces in western and south western Iran, some samplings were carried out by night catch (UV light) method during October 2007-March 2009. In total, 187 scorpions were collected. Vachoniolus iranus is a new species of Vachoniolus, that described from Khoozestan and Ilam provinces in South-western and Western of Iran. This is first record of genus Vachoniolus from Iran.
Geographical Races of Old World Screw-Worm Fly, Chrysomyia bezziana Villeneuve, 1914, in South-Western Iran
S.H. Navidpour,M. Abdi Goudarzi,A. Gholamiyan,E. Jahanifard
Journal of Biological Sciences , 2009,
Abstract: A morphological analysis was undertaken with objective of identifying markers for geographical population of Old World screw worm flies, Chrysomyia bezziana Villeneuve (Diptera: Calliphoridae) in Khoozestan province, South Western Iran. During May 2006 to August 2007 the larvae of Chrysomyia collected from infested animals (Mostly sheep) and were incubated under suitable substratum in the Entomology laboratory. Totally 986 specimens were examined and geographical races of screw-worm fly were identified based on morphological characters by using diagnosis key. The study of morphological characters of the Old World screw worm flies population of South western Iran suggested that specimens are the same with Arabian race characters and demonstrates that the outbreak of C. bezziana in Iran related to populations that originated from Arab countries of the Persian Gulf like United Arab Emirates.
Identification and Purification of the Three Toxins from Odotobuthus bidentatus, Lourenco and Pezier 2002, Venom (Scorpions, Buthidae)
B. Masihipour,A.M. Zare,S.H. Navidpour,A. Taghavi Moghadam
Journal of Biological Sciences , 2009,
Abstract: Odonthobuthus belongs to Buthidae family from which 2 species O.doriea and O. bidentatus have been collected and reported from Iran. This study investigated the venom of O. bidentatus to identify mammal toxic fractions. After collecting scorpions, they were milked with electroshock technique and then the venoms was lyophilized. The LD50 of the venom was determined by injecting the venom to 18-20 g mice via., tail vein. In order to separate different fractions, the freeze dried venom was solubilized in distilled water and centrifuged at 15000 rpm for 20 min, to separate insoluble material and the clear supernatant containing soluble venom was loaded on a chromatography column packed with sephadex G50 gel and the fractions were collected according to UV absorption at 280 nm wavelength. Second fraction was toxic in Lab animal and in order to study sub fractions, fraction II (O2) was loaded first on an anionic ion exchange resin (DEAE sephacel) out of which we obtained 2 toxic fractions (O21 and O23). Then these 2 fraction were loaded on a cationic resin (CM sephadex C25) out of which, from fraction 21, we got 2 toxic fractions (O211, O213) and from fraction O23 we got one toxic fraction (O232). SDS PAGE electrophoretic studies on these toxins showed single band appearance that indicates purified toxins with molecular weight of O211 9.2, O213 8.6 and O233 6.8 kD.
On the Sackur-Tetrode equation in an expanding universe
Pereira, S.H.;
Revista mexicana de física E , 2011,
Abstract: in this work we investigate the thermodynamic properties satisfied by an expanding universe filled with a monoatomic ideal gas. we show that the equations for the energy density, entropy density and chemical potential remain the same of an ideal gas confined to a constant volume v. in particular the sackur-tetrode equation for the entropy of the ideal gas is also valid in the case of an expanding universe, provided that the constant value that represents the current entropy of the universe is appropriately chosen.
A rhenium-gold contact alloy for sensitive relays
S.H.
Gold Bulletin , 1976, DOI: 10.1007/BF03215422
Abstract:
On the Sackur-Tetrode equation in an expanding universe
S.H. Pereira
Revista mexicana de física , 2011,
Abstract: En el presente trabajo investigamos las propriedades termodinámicas que son satisfechas por un universo en expansión, el cual es lleno por un gas ideal monoatómico. Se prueba que las ecuaciones para la densidad de la energía, la densidad de la entropía y el potencial químico son las mismas que las de un gas ideal, el cual se encuentra confinado en un volumen V. En particular, la ecuación de Sackur-Tetrode, para la entropía del gas ideal continua siendo válido en el caso de un universo en expansión, siempre que el valor constante que representa la entropía del universo actual sea escojido adecuadamente.
On the Sackur-Tetrode equation in an expanding universe
S.H. Pereira
Revista mexicana de física E , 2011,
Abstract: In this work we investigate the thermodynamic properties satisfied by an expanding universe filled with a monoatomic ideal gas. We show that the equations for the energy density, entropy density and chemical potential remain the same of an ideal gas confined to a constant volume V. In particular the Sackur-Tetrode equation for the entropy of the ideal gas is also valid in the case of an expanding universe, provided that the constant value that represents the current entropy of the universe is appropriately chosen. En el presente trabajo investigamos las propiedades termodinámicas que son satisfechas por un universo en expansión, el cual es lleno por un gas ideal monoatómico. Se prueba que las ecuaciones para la densidad de la energía, la densidad de la entropía y el potencial químico son las mismas que las de un gas ideal, el cual se encuentra confinado en un volumen V. En particular, la ecuación de Sackur-Tetrode, para la entropía del gas ideal continua siendo válido en el caso de un universo en expansión, siempre que el valor constante que representa la entropía del universo actual sea escogido adecuadamente.
TLC Determination of Marmesin, a Biologically Active Marker from Feronia Limonia L.  [PDF]
Mahendra Jain, Ashish Trivedi, S.H. Mishra
American Journal of Plant Sciences (AJPS) , 2010, DOI: 10.4236/ajps.2010.11002
Abstract: Feronia limonia Linn. (Rutaceae) have gained traditional therapeutic importance owing to their high essential oil and coumarins content. Marmesin, a furanocoumarin was identified by TLC and isolated by column chromatography and further purified by Preparative TLC. Presently, there is no appropriate TLC based method available for standardization of F. limonia. A simple, sensitive and accurate high performance thin layer chromatographic (HPTLC) method has been developed for the estimation of marmesin in the methanolic extract of stem bark of Feronia limonia. HPTLC was performed on precoated silica gel 60F254 aluminium plates (20 cm × 20 cm) with Chloroform: Methanol (9.5:0.5), as mobile phase. Quantitative evaluation of the plate was performed in the absorption-reflection mode at 338 nm. The calibration curve was linear in the concentration range of 20 – 100 ng spot–1. The method was validated for precision, repeatability and accuracy. The technique has been applied, for the first time, for the estimation of marmesin. The proposed method was found to be robust, precise, and accurate, it therefore holds potential for detection, monitoring and quantification of marmesin in Feronia limonia and its related formulation.
First Record of Cercospora Leaf Spot Disease on Okra Plants and its Control in Egypt
Eman S.H. Farrag
Plant Pathology Journal , 2011,
Abstract: During June to September 2008, okra plants (Hibiscus esculentus L.) in Kafr El-Sheikh Governorate exhibited typical symptoms of Cercospora Leaf Spot (CLS) at different locations. Symptoms of infected okra leaves firstly started as light brown spots then turned to purple and varying in size. The spots spread to cover large areas of infected leaves. In case of severe infection, spots joined together and formed patches. Later, leaves were dry and remained intact with stem of plant. Samples of diseased leaves were collected to isolate the causal organisms. Isolated fungi were purified using single spore culture technique. Developed fungus was identified as Cercospora sp. Fresen based on cultural and morphological characteristics after light microscope examination. Also, Alternaria alternate and Aspergillus niger were isolated as associated fungi. Pathoginicity test confirmed efficiency of Cercospora sp. to induce typical symptoms on okra plants compared with other fungi. Foliar application using different concentrations of Topsin M-70WP and lemongrass oil was significantly reduced disease incidence compared with control. According to the available literature, this is the first record of CLS on okra in Egypt under natural infection in the field.
APreliminaryStudyontheRocksoftheKaolanComplex,Kaolan,Kansu
S.H.SUNG
地质学报 , 1948,
Abstract: Asearlyas1878,whilecarryingonhisgeologicalworkinKansu,LudwigvonLoczy[12]visitedtheregionunderstudyandforthefirsttimenotedtheexistenceofamoderatelymetamorphosedrockseriesofmica-schistandamphibolite-schistwithgraniteandpegmatiteintrusions.Thedistrictwas
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