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Differential Diagnosis of Metabolic Alkalosis
F Mostafavi,M Hafizi
Iranian Journal of Pediatrics , 1995,
Abstract: A 9-month old female infant with growth retardation, constipation and restlessness id presented. Laboratory findings revealed hypochloremic metabolic alkalosis with hypokalemia and hyponatremia. Clinical and laboratory findings led us to think of batter syndrome and cystic fibrosis. Serum and urine levels of chloride were low. This led to the estimation of sweat electrolytes, which showed high chloride levels. Taking also into account other laboratory and clinical parameters cystic fibrosis was the final diagnosis.
INTRAHEPATIC CHOLELITHIASIS
M. MEHDI HAFIZI
Acta Medica Iranica , 1987,
Abstract: A case o f Intrahepatic stone and its t r eat ment i s present e d . The t ype s o f i ntrahepatic s tones , t h e etiological f act o r , t he ways of di agno s is and t reatment a re b eing discussed. The disease is common in far Eastern c ountri es a nd Asian Are a, with c lonorchi s s i nens is inf estation, but s peci ally in Iran when the s tones i s a lone in Intrahepatic ducts without extrahepatic duc t stone,as this case repor t , i s very rare.
FATAL STRONGYLOIDIASIS FOLLOWING MASSIVE CORTICOSTEROID THERAPY
M. MEHDI HAFIZI,SADEGH SAMOORIAN
Acta Medica Iranica , 1985,
Abstract:
Prevalence of HBV and HCV Infections and Associated Risk Factors in Addict Prisoners
AA Javadi,M Avijgan,M Hafizi
Iranian Journal of Public Health , 2006,
Abstract: High prevalence of HBV and HCV infections in prisoners suggests them as one of the main infection source in community. Preventive measures can possibly decrease their rate of infection and infectivity. We evaluated prevalence of HBV and HCV infections and their relation to dangerous behavior in addict prisoners. This was a cross-sectional study included prisoners of central provinces of Iran who were evaluated for HBV and HCV in 2003. All of 1431 prisoners filled out questionnaires that were evaluated for HBsAg and HCV antibody. There were 51 prisoners (3.5%) who were HBsAg positive and 513 prisoners (35.8%) had HCV antibody. Odd`s ratio for HBV and HCV were 10.3 and 9.6 for IVDA, respectively. This study showed that the HBV and specially HCV infection had high prevalence among prisoners. In comparison to rate of HBsAg and HCV infection in general population of Iran, this study showed that the HBsAg was 2 times and HCV infection was 70 times more frequent in prisoner than in general population of Iran. The education for dangerous behavior is strongly recommended to control this persistent infection source for hepatitis B and C in the community.
The lag and duration-luminosity relations of gamma-ray burst pulses
S. Boci,M. Hafizi,R. Mochkovitch
Physics , 2011, DOI: 10.1051/0004-6361/201014132
Abstract: Relations linking the temporal or/and spectral properties of the prompt emission of gamma-ray bursts (hereafter GRBs) to the absolute luminosity are of great importance as they both constrain the radiation mechanisms and represent potential distance indicators. Here we discuss two such relations: the lag-luminosity relation and the newly discovered duration-luminosity relation of GRB pulses. We aim to extend our previous work on the origin of spectral lags, using the duration-luminosity relation recently discovered by Hakkila et al. to connect lags and luminosity. We also present a way to test this relation which has originally been established with a limited sample of only 12 pulses. We relate lags to the spectral evolution and shape of the pulses with a linear expansion of the pulse properties around maximum. We then couple this first result to the duration-luminosity relation to obtain the lag-luminosity and lag-duration relations. We finally use a Monte-Carlo method to generate a population of synthetic GRB pulses which is then used to check the validity of the duration-luminosity relation. Our theoretical results for the lag and duration-luminosity relations are in good agreement with the data. They are rather insensitive to the assumptions regarding the burst spectral parameters. Our Monte Carlo analysis of a population of synthetic pulses confirms that the duration-luminosity relation must be satisfied to reproduce the observational duration-peak flux diagram of BATSE GRB pulses. The newly discovered duration-luminosity relation offers the possibility to link all three quantities: lag, duration and luminosity of GRB pulses in a consistent way. Some evidence for its validity have been presented but its origin is not easy to explain in the context of the internal shock model.
A theoretical calculation of microlensing signatures caused by free-floating planets towards the Galactic bulge
L. Hamolli,M. Hafizi,A. A. Nucita
Physics , 2014, DOI: 10.1142/S0218271813500727
Abstract: Free-floating planets are recently drawing a special interest of the scientific community. Gravitational microlensing is up to now the exclusive method for the investigation of free-floating planets, including their spatial distribution function and mass function. In this work, we examine the possibility that the future Euclid space-based observatory may allow to discover a substantial number of microlensing events caused by free-floating planets. Based on latest results about the free-floating planet mass function in the mass range $[10^{-5}, 10^{-2}]M_{\odot}$, we calculate the optical depth towards the Galactic bulge as well as the expected microlensing rate and find that Euclid may be able to detect hundreds to thousands of these events per month. Making use of a synthetic population, we also investigate the possibility of detecting parallax effect in simulated microlensing events due to free-floating planets and find a significant efficiency for the parallax detection that turns out to be around 30%.
TGF-b Downregulation by RNAi Technique in ex Vivo-Expanded HSCs on 3D DBM Scaffold
ZS Hashemi,M Forouzandeh Moghadam,M Soleimani,M Hafizi
Tehran University Medical Journal , 2012,
Abstract: Background: Bone Marrow Transplantations (BMT) are limited by low CD34+ cell counts in umbilical cord blood (UCB) and these cells need to be expanded for success in such procedures. To achieve this goal, ex vivo expansion of hematopoietic stem cells (HSCs) by enhancing their self-renewal activity on demineralized bone matrix (DBM) scaffold coated with mesenchymal progenitor cells (MPCs) and unrestricted somatic stem cells (USSCs) was recommended. TGF-b pathway is a key inhibitory factor for HSCs self-renewal. In this study ex vivo expansion and downregulation of TGF-b pathway were simultaneously performed. Methods: USSC cells were isolated from UCB and then coated on DBM scaffold as a feeder layer. UCB CD34+ cells were isolated from UCB by magnetic activated cell sorting (MACS) method and were transfected by siRNA against TGFbR2 in two-dimensional (2D) and three-dimensional (3D) cultures by co-cultivation with USSC. TGFbR2 expression levels were evaluated by quantitative real-time PCR. Cell count and flow cytometry were performed and clonogenic activity was evaluated. Results: Ex vivo expansion of CD34+ cells was significantly enhanced (41±0.7 folds) by TGFbR2 downregulation, especially in 2D than 3D cultures. Finally, 2D culture showed less TGFbR2 expression levels and higher increase in the percentage of CD34 markers by flow cytometry assay. Conclusion: The 3D siRNA delivery system would be of lower efficiency in contrast to 2D settings where the cells have less freedom and are in more contact with the feeder layer.
ISOLATION OF TOXOPLASMA GONDII FROM HUMAN TISSUES
M. Ghorbani,A. Hafizi,A. Sanati,H. Modarres-Musavi
Iranian Journal of Public Health , 1979,
Abstract: Nineteen lymph node biopsies, 3 curetting, 15 blood samples obtained from patients with lymphadenitis and high titers of Toxoplasma antibodies, and 27 tonsillar tissues removed from patients because of chronic tonsillitis were inoculated intraperitoneally into mice for isolation of toxoplasma gondii. Toxoplasms were isolated from 5 lymph node biopsies, one curettage material, 2 tonsillar tissues and none of the blood samples.
AlkylationofBenzenewith1-DeceneUsingSilicaSupportedPreysslerHeteropolyAcid:StatisticalDesignwithResponseSurfaceMethodology
A. HAFIZI,A. AHMADPOUR,M. M. HERAVI,F. F. BAMOHARRAM,M. KHOSROSHAHI
催化学报 , 2012, DOI: 10.1016/S1872-2067(11)60357-4
Abstract: ?Theresponsesurfacemethod(RSM)wasappliedtostudytheliquidphasealkylationofbenzenewith1-decenecatalyzedbymeansofsilicasupportedpreysslerheteropolyacid.Athreestepexperimentaldesignwasdevelopedbasedonthecentralcompositedesign(CCD).Catalystloading,catalystpercent,andbenzeneto1-decenemolarratiowereusedtooptimize1-deceneconversionandlinearalkylbanzene(LAB)yield.Theresultsindicatedthatthequadraticmodelwassignificantforthesetworesponses.Theexperimentalresultsrevealedthatallvariableshadpositiveeffecton1-deceneconversion.WhileincreasingthecatalystloadingtendstodecreaseLAByield.Benzeneto1-decenemolarratiowasfoundtobethemostimportantfactorthatinfluencedLAByieldwithapositiveeffect.Designexpertsoftwaresuggestedseveraloptimizedsolutions,amongthemthebestchoicewastouse31%catalystloading,benzeneto1-decenemolarratioof13,andcatalystpercentof3.6wt%forobtaining100%conversionand88%LABproductionyield.
A nonlinear plasma retroreflector for single pulse Compton backscattering
J. P. Palastro,D. Kaganovich,D. Gordon,B. Hafizi,M. Helle,J. Penano,A. Ting
Physics , 2014, DOI: 10.1088/1367-2630/17/2/023072
Abstract: Compton scattered x-rays can be generated using a configuration consisting of a single, ultra-intense laser pulse, and a shaped gas target. The gas target incorporates a hydrodynamically formed density spike, which nonlinearly scatters the incident pump radiation, to produce a counter-propagating electromagnetic wiggler. This self-generated wiggler field Compton scatters from electrons accelerated in the laser wakefield of the pump radiation. The nonlinear scattering mechanism in the density spike is examined theoretically and numerically in order to optimize the Compton scattered radiation. It is found that narrow-band x-rays are produced by moderate intensity pump radiation incident on the quarter-critical surface of the density spike, while high fluence, broadband x-rays are produced by high intensity pump radiation reflected near the critical surface.
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