Publications (20)8 Total impact
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Article: Immunosuppressive effect of prolactin-induced protein.
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ABSTRACT: Prolactin-induced protein (PIP) has been shown to bind to CD4 and is speculated to block CD4-HLA-DR interaction. However, the immunomodulatory effect of PIP on chronic allergic contact dermatitis (ACD) remains to be elucidated. The aim of this work was to define the role of PIP during the immunoresponse. Using an oxazolone-induced mouse chronic ACD model, expression of PIP was immunohistologically examined. Furthermore, effects of continued exposure of a peptide mimicking the major binding site of PIP (amino acids 106-132) for CD4 was examined in a mouse chronic ACD model. We clarified that keratinocytes and dermal infiltrating cells are positively stained with anti-PIP antibody. The PIP peptide significantly downregulated oxazolone-induced mouse ACD compared to the controls. We also found that inflammation of PIP-non-applied control ear was also suppressed in a synchronized manner in the late phase of the PIP peptide applied mouse. These findings suggest that PIP might have an immunosuppressive effect in mouse chronic ACD.Progress in allergy 01/2012; 96:100-7. -
Article: Incidence and Genetic Characterization of Gongylonema pulchrum in Cattle Slaughtered in Mazandaran Province, Northern Iran.
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ABSTRACT: The gullet worm, Gongylonema pulchrum Molin, 1857, is a thread-like spirurid nematode found in a variety of mammals worldwide. Its incidences in Iranian cattle of different breed or age have not been reported. The aims of the present study are to disclose the infection status of G. pulchrum in cattle slaughtered in northern region of Iran. Full-length esophagi of cattle of 97 native dairy breed and 41 Holstein-Friesian breed were collected at four local abattoirs in Mazandaran Province, northern Iran, from March 2006 to August 2007, and were examined parasitologically. Eight overlapping segments of the small- and large-subunits of rDNA were amplified by PCR, and the obtained nucleotide sequences were characterized. The incidences of G. pulchrum in female and male native dairy breed were 38.9% and 24.0%, respectively, whereas those in female and male Holstein-Friesian breed were 4.2% and 0%, respectively. The first internal transcribed spacer (ITS1) region of G. pulchrum rDNA showed an intra-individual variation in the sequence and length, and the variation was ascribed to some unstable repeats of "A" or "CA". Distinct incidences of G. pulchrum infection in native dairy breed and Holstein-Friesian breed might be ascribed to different animal husbandry manners for each breed in Iran; the former breed grazes freely in the pasture, but the latter breed is usually held in a pen. The rDNA sequence of Iranian G. pulchrum, obtained for the first time by us, might facilitate a reliable species identification of the parasite with a wide spectrum of morphological variations.Iranian journal of parasitology. 06/2010; 5(2):10-8. -
Article: Immunosuppressive effect of prolactin-induced protein: a new insight into its local and systemic role in chronic allergic contact dermatitis.
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ABSTRACT: Prolactin-induced protein (PIP) has been shown to bind to CD4 and is speculated to block CD4-HLA-DR interaction. However, the immunomodulatory effect of PIP on chronic allergic contact dermatitis (ACD) remains to be elucidated. To define the role of PIP during the immunoresponse. Using a low-dose oxazolone-induced mouse chronic ACD model, expression of PIP was examined immunohistologically. Furthermore, effects of continued exposure to a peptide mimicking the major binding site of PIP (amino acids 106-132) for CD4 was examined in a mouse chronic ACD model. We clarified that keratinocytes, dermal infiltrating cells and spleen infiltrating mononuclear cells are positively stained with anti-PIP antibody. The PIP peptide significantly downregulated oxazolone-induced mouse ACD compared with controls. We also found that inflammation of the control ear, to which the PIP peptide had not been applied, was also suppressed in a synchronized manner in the late phase of ACD. These findings suggest that PIP might have a local and systemic immunosuppressive effect in mouse chronic ACD.British Journal of Dermatology 03/2010; 162(6):1286-93. · 3.67 Impact Factor -
Article: Studies of Au4X‐Ordered Alloys: Electron and Neutron Diffraction, Resistivity and Specific Heat
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ABSTRACT: Micro‐, chemical and magnetic structures of ordered alloys Au 4 X, where X stands for various transition elements and their mixtures, have been studied using electron, x‐ray, and neutron diffraction. Specific heat and electrical resistivity measurements have been carried out for Au 4 Ti, Au 4 (Ti 0.5 Cr 0.5 )Au 4 V, Au 4 (V 0.5 Mn 0.5 )Au 4 Cr, Au 4 (Cr 0.5 Fe 0.5 ), and Au 4 Mn. The magnetic form factors are given for Au 4 Cr and Au 4 Mn.Journal of Applied Physics 04/1969; · 2.17 Impact Factor -
Article: Transitions from Ferromagnetism to Antiferromagnetism in Iron Aluminum Alloys
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ABSTRACT: From a study of magnetic isotherms over the range of compositions from pure Fe to 40 atomic percent Al in Fe and over temperatures from 4°K to 300°K, we have produced strong evidence for the existence of super‐exchange interactions between iron atoms separated by aluminum atoms. The iron rich alloys show ferromagnetism in the usual way, but, for concentrations approaching 40 atomic percent Al, the alloys behave as antiferromagnetic with Néel points near liquid hydrogen temperatures. There is a transition range of composition in which the stable state just below the Curie temperature is ferromagnetic but at low temperatures is antiferromagnetic. The large changes in magnetic properties occur for the ordered structures and in composition ranges where the number of nearest neighbor iron‐iron interactions is changing rapidly with composition, but where the number of next nearest neighbor iron‐iron interactions remains practically constant. These considerations lead to a model where only the nearest neighbor direct positive exchange interactions between iron atoms, and indirect negative exchange interactions between iron atoms separated by an aluminum atom are taken into account. The treatment by a Bragg‐Williams type calculation leads to a qualitative understanding of the observed magnetic effects in the iron aluminum system, including the differences between the disordered state and the two types of ordered states. The model also leads to a reinterpretation of neutron diffraction data.Journal of Applied Physics 04/1958; · 2.17 Impact Factor -
Article: Towards an understanding of the sorption of U(VI) and Se(IV) on sodium bentonite
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ABSTRACT: The sorption behaviour of uranium(VI) and selenium(IV) on a purified bentonite sample has been investigated and the results compared with those for sorption onto the unpurified material and goethite. Batch sorption data for U(VI) on purified bentonite show strong sorption in the pH range 5 to 8 (Rd>104 cm3 g−1). Outside this range the sorption decreases although the Rd remains above 103 cm3 g−1 across the pH range studied. U(VI) sorption was also found to decrease rapidly with increasing carbonate concentration. Thermodynamic modelling of the data indicates that sorption at low pH may be due to an ion-exchange process, whereas above pH 5 surface complexation dominates. The sorption of Se(IV) on purified bentonite was found to be significant only below pH 7. Sorption of Se(IV) on goethite showed a strong dependency on pH; with strong sorption below pH 8, and a sharp decrease in sorption above pH 8. Sorption of Se(IV) onto the smectite component of impure bentonite is therefore only likely to be significant at low pH and sorption is dominated by a goethite-like surface of an iron constituent mineral above pH 5.Journal of Contaminant Hydrology. -
Article: Factors influencing the capillary separation of leukocytes from whole blood in a plastic-based microfluidic chip
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ABSTRACT: This study describes some of the influencing factors, such as capillary action, static electricity and magnetic force, on the ability to separate living leukocytes from a single droplet of blood (<1 μl) in a plastic-based microfluidic chip.The chip was constructed from two substrate materials sandwiched together to form a micron-order gap (40 μm) with an upper hydrophilic (glass) surface and a lower hydrophobic (acrylic resin) surface. A blood sample flowed into the gap between the two substrates driven by the difference in surface tension between the two materials. Leukocytes adhered to the lower hydrophobic surface, whereas red corpuscles flowed toward the exit of the microfluidic device (this phenomenon is referred to as micro-flow). The separation rate of the red corpuscles was 91 ± 9% in a unit area of 0.1 mm2.Furthermore, we analyzed the change in the numbers of living leukocytes that could be collected after separation in the chip under different conditions. When SiO2 and iron composite particles, 10 μm in size, were added to the blood sample, leukocytes formed colonies containing two or three cells. The colonies could be moved freely on the x–y plane using a Nd magnet. When the upper board was charged by static electricity, the colonies adhered to the underneath of the upper board. Five or more colonies, as well as 10 or more individual leukocytes, were able to collect in a 0.1 mm2 area of the chip after micro-flow operation. Thus, the separation efficiency of a living cell colony containing Fe particles in a capillary chip is markedly influenced by magnetic and electrostatic forces.Sensors and Actuators B: Chemical. -
Article: Spectroscopic properties of Yb3+: LuLiF4 crystal grown by the Czochralski method for laser applications and evaluation of quenching processes: a comparison with Yb3+: YLiF4
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ABSTRACT: Spectroscopic properties of Yb3+ ion in LuLiF4 (LLF) laser host are presented here for the first time. Czochralski technique was used to grow undoped and Yb3+-doped LLF single crystals under CF4 atmosphere. Detailed analysis of Yb3+-doped LLF spectroscopy were made to contribute to the determination of energy levels in this host and a comparison with the isomorphic YLiF4 (YLF) laser host is done. We are dealing with temperature and concentration dependences of both π and σ polarizations of the infrared (IR) absorption and emission spectra. Raman spectra were also used to give an attempt for the interpretation of electronic and vibronic levels. Concentration dependence of fluorescence lifetimes allows the measurement of the high radiative lifetime in the range of 2–3 ms and shows a strong self-trapping process. Self-quenching was not seen by the reduction of the decay times but observed by non-radiative up-conversion energy transfer due to the presence of Er3+ and Tm3+ ions as unexpected impurities. Contrary to oxide crystals this process still remains lower than the self-trapping process. Yb3+ pairing and clustering were investigated as well. Evaluation of the laser potentiality of this host by the evaluation of figure-of-merit developed by our group is presented.Journal of Alloys and Compounds. -
Article: Raman scattering investigation of skutterudite compounds
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ABSTRACT: Raman scattering spectra of filled skutterudite RT4X12 (R=La, Ce, Pr, Nd, Sm and Y, T=Fe, Ru and Os, and X=Sb and P) and unfilled skutterudite CoP3 have been measured. All first-order Raman active phonons, which are due to the vibration of pnictogens, are observed. In addition, the crystal field excitations in PrRu4P12 spectra and the second-order phonons including rare-earth vibrations in SmRu4P12 and ROs4Sb12 are also observed. The second-order phonons can be observed for the sample with the larger cage space. The peak intensity of the second-order phonons decreases with decreasing temperature and vanishes at low temperature. Such a temperature dependence suggests that the second-order phonons are thermally excited and due to independent vibrations of the rare-earth ions, that is rattler motion.Physica B: Condensed Matter. -
Article: Traumatic dislocation of the tibialis posterior tendon
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ABSTRACT: Dislocation of the tibialis posterior tendon (TPT) at the ankle level is very rare. The difficult clinical diagnosis frequently causes delay of surgical treatment. Loss of TPT function impairs normal posture and walking stance because of the acquired flat foot deformity. English literature has reported only 16 cases of traumatic TPT dislocation.1,3–10 Significance of magnetic resonance imaging (MRI) has not been stressed so far. We present a case of TPT dislocation with its MRI findings.The Foot. -
Article: Contribution of CIRP to the Development of Metrology and Surface Quality Evaluation during the last fifty years
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ABSTRACT: An overview of the contribution of the members of the C.I.R.P. community to the progress of Metrology and Surface Roughness Quality Evaluation is given. The following items are included in the part on metrology: brief overview of the existing situation before 1950, contribution to the successive definitions of the unit of length and related reference length standards, traceability, preliminary work to standardization, thermal effects, design and construction of precision machine tools and measuring machines, CMM, large scale metrology.In the field of surface quality evaluation, the following items are reviewed: reference profiles and related definitions of parameters, filtering, surface and subsurface integrity, functional meaning of parameters, instrumentation, scanning probe microscopy, 3D surface evaluation. A comprehensive list of references is provided.CIRP Annals - Manufacturing Technology. -
Article: Measurement of interaction cross sections using isotope beams of Be and B and isospin dependence of the nuclear radii
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ABSTRACT: Interaction radii for 11,12,14Be and 8,12,13,14,15B have been determined by the measurement of interaction cross sections at 790 MeV/nucleon. Effective root-mean-square (RMS) radii of nucleon distribution of these nuclei have been deduced using a Glauber-model calculation. Isospin dependence of nuclear radii are presented for isobars of mass numbers from 6 to 12, and compared with theoretical predictions by the droplet model and by a Hartree-Fock (HF) model. The HF model with the Skyrme-III potential, which includes a strong density-dependent force, reproduce the observed isospin dependence.Physics Letters B. -
Article: Volume and dislocation diffusion of iron, chromium and cobalt in CVD β-SiC
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ABSTRACT: Impurity tracer diffusion of 59Fe, 51Cr and 57Co in CVD β-SiC has been studied in the temperature range between 973 and 1873 K. The temperature dependence of the volume diffusion coefficients of iron and chromium can be expressed by linear Arrhenius equations. The preexponential factor and the activation energy are estimated to be 8.7×10−15 m2 s−1 and 111 kJ mol−1 for iron, respectively, and 9.5×10−15 m2 s−1 and 81 kJ mol−1 for chromium, respectively. The diffusion coefficients of iron and chromium are much higher than those of the self-diffusion in β-SiC. Furthermore, the activation energies for the diffusion of iron and chromium are about one-tenth of those for carbon and silicon in β-SiC. Therefore, it seems that an interstitial mechanism is predominant for the diffusion of iron and chromium in β-SiC. On the other hand, the diffusion coefficient of cobalt above 1673 K is higher than that of iron, while at lower temperatures it is much lower than that of iron. The difference in the diffusion coefficients at 1173 K is more than three orders of magnitude. Thus, the temperature dependence of the diffusion coefficients of cobalt shows a strongly curved Arrhenius relation. This suggests that cobalt atoms diffuse by an interstitial mechanism at higher temperatures and by a substitutional mechanism at lower temperatures. From the deeper regions of the penetration profiles of iron, chromium and cobalt the dislocation diffusion coefficients of them have been estimated.Science and Technology of Advanced Materials. -
Article: Development of a High-Speed Manufacturing Method for Electroplated Diamond Wire Tools
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ABSTRACT: Fixed-abrasive multi-wire sawing processes can be used to slice silicon and quartz crystal due to the introduction of resinoid diamond-wire or electroplated diamond-wire tools. The latter kind have a higher wear resistance, but have higher production costs because electroplating is time consuming. Consequently, it is impractical to use them because they are too expensive. In this paper, ultra high-speed electroplating using felt brushes is proposed for manufacturing them. A series of experiments revealed that production speed is improved 30 times and tools produced with the new process have a higher wear resistance than commercially produced tools.CIRP Annals - Manufacturing Technology. -
Article: Systematic behavior of ejectile spin polarization in the projectile fragmentation reaction
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ABSTRACT: Ejectile spin polarization P in intermediate-energy projectile fragmentation has been measured for different targets and incident energies using the RIPS fragment separator at RIKEN. The observed P as a function of the fragment momentum shows a systematic change when the atomic number of the target or the incident energy is varied. Most remarkably, P does not vanish at the momentum corresponding to the beam velocity, indicating an important effect which has not been considered in the previously proposed model.Physics Letters B. -
Article: A magnetic neutron lens
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ABSTRACT: The focusing effect on a cold neutron beam using a 2 m permanent sextupole magnet was measured. The beam intensity was enhanced at all measured wavelengths, and a maximum gain of 36.5 was obtained in the wavelength range .Physica B: Condensed Matter. -
Article: Analyzing power of C and Cu (p→, 2p) quasi-elastic scattering at 3.5 GeV
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ABSTRACT: Analyzing powers have been measured for the quasi-elastic scattering in carbon and copper using a KEK 3.5 GeV polarized proton beam. The present result shows relatively larger analyzing powers compared with the ones obtained for carbon in the energy region 0.52–2.8 GeV at Saclay (Saturne). The t-dependence for C and Cu is compared with a calculation based on the relativistic impulse approximation and is reproduced well.Physics Letters B. -
Article: Feasibility of finding malignant diseases with the Ar+ 501.7 nm laser line using a new blood-analysis method
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ABSTRACT: Utilizing a new blood-analysis method which uses the interaction between an Ar+ laser beam and a blood sample, it can be shown that there is a significant difference in the reflectance variation δR between the malignant and benign blood, at 501.7 nm of the Ar+ laser, under a dc magnetic field, for both human and mouse blood. For the malignant mouse-blood with leukaemia, δR tends to be positive with the magnetic field, while for the benign blood it is negative. This is also true for the human blood. This fact is confirmed by the inverted variation of the higher order Fourier pattern obtained by the Fourier pattern analyser from the transmitted beam through the diluted sample, for the malignant and benign mouse-blood under the magnetic field.Optics & Laser Technology. -
Article: Remarks on magnetically dilute systems
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ABSTRACT: Because of the inadequacies of previous treatments of the magnetic properties of magnetically dilute systems when used to interpret experimental results, a re-examination of the problem starting from a simple model is made. The treatments of the problem discussed here, using an Ising model, show that a Curie or a Néel temperature does not appear until a finite concentration of magnetic atoms is obtained if the atomic distribution is random. This concentration depends on the co-ordination number of the lattice and on the range of interaction, but not on the strength of the interaction. The results given here for nearest-neighbor interactions describe the general behavior observed in magnetically dilute solutions. Such things as anomalously high values of “effective magnetic moments” per magnetic atom and its concentration-dependence, curvature in inverse susceptibility against temperature plots, and parasitic paramagnetism in the weakly ferromagnetic alloys, &c., are reasonably well explained. When the system has antiferromagnetic interactions, it is found that the inverse susceptibility shows a complicated temperature-dependence varying with concentration and that the existence of a maximum in the susceptibility does not necessarily mean the onset of antiferromagnetism. Special references are made to iron in gold and chromium and to manganese in copper.Journal of Physics and Chemistry of Solids. -
Article: Multiple superconducting phases in heavy fermion superconductors
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ABSTRACT: We show that in recently discovered heavy fermion superconductors, quasi two-dimensional CeCoIn5 and skutterudite PrOs4Sb12, multiple superconducting phases with different symmetries manifest themselves below Tc. The ultrasound velocity measurements revealed that in CeCoIn5 the Fulde–Ferrel–Larkin–Ovchinikov phase, in which the order parameter is spatially modulated and has planar nodes aligned perpendicular to the vortices, appears at low temperature and high field. The angle resolved magnetothermal transport measurements revealed that in PrOs4Sb12 a novel change in the symmetry of the superconducting gap function occurs deep inside the superconducting state. These results open up a new realm for the study of the superconductivity with multiple phases.Journal of Physics and Chemistry of Solids.
Top co-authors
Top Journals
Institutions
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2010
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Islamic Azad University
- Department of Veterinary Medicine
Tehrān, Ostan-e Tehran, Iran
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1958–1969
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Ford Motor Company
Dearborn, MI, USA
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