Journal of Sciences, Islamic Republic of Iran
Year:2009 | Volume:20 | Issue:2|Papers Count:8

Chemokine and chemokine receptors show several variations which may affect resistance to infectious disease. A 32 base pair deletion in the open reading frame of the human CCR5 gene (CCR5D32) results in producing a truncated antigen which fails to be presented on the surface of target cells. CCR5D32 variant is not a functional co receptor for HIV-1 entrance and delay the onset of acquired immunodeficiency syndrome. To determine the situation of Iranian population, regarding having this protective mutation in their CCR5 gene or not, this study was carried out. Genomic DNA was extracted using the salting out method from 190 healthy subjects. Using PCR method, the allelic and genotypic frequencies were found for this locus in the CCR5 gene. The results of this study showed that the frequency of the CCR5D32 allele in heterozygote form is about 0.0211. Also no homozygote form of the mutated CCR5 gene (D32/D32) was identified. Based on the findings of this study it is possible to say, Iranian nation compare to European nation are more susceptible to HIV virus infection during exposure to this virus. But to confirm this hypothesis, more investigation needs to be designed and performed.

Complexes of 3-[{3-(3’-bromo phenyl)}-prop-2-enoyl]-4-hydroxy-6-methyl- 2H-chromen-2-one with Cu(II), Ni(II), Fe(II), Co(II) and Mn(II) have been synthesized and characterized using elemental analysis, IR spectra and conductivity measurements. These studies revealed that they are having octahedral geometry of the type [ML2 (H2O)2]. In-vitro antimicrobial activity of all synthesized compounds and standard drugs have been evaluated against four strains of bacterial culture and one fungus, which includes two gram +ve bacterial culture and two gram-ve bacterial culture, which show net enhancement in activity on co-ordination of metals with ligand but moderate activity as compare to standard drugs.

Tourmalinization characterizes the most pervasive alteration type in the Nezam Abad ore deposit, west-central Iran. It delineates high-temperature centers of mineralization and together with quartz and cassiterite form inner parts of the alteration halo. The composition of tourmalines plots mostly along and between the proton and alkali-deficient end members. Tourmaline in quartzdioritic host is chemically and optically homogenous, with a general tendency toward more schorlitic compositions and is marked by Al deficiency in R3. Tourmaline in hydrothermal veins shows fine-scale chemical and optical zonation, tendency to more dravitic compositions and is characterized by lower F content and larger Fe/(Fe+Mg) variation with generally lesser values than quartzdioritic counterpart. The Rb-Sr and Sm-Nd isotope analyses of quartzdioritic units of the Boroujerd complex and separated hydrothermal tourmalines (eNd -6.43 to -3.24) imply derivation from enriched sources with a lower Sm/Nd ratio than Chondritic Uniform Reservoir. The d18O values (11.9 to 13.8‰) of quartz of hydrothermal veins suggest magmatic mineralizing fluids whose d18O values have been increased through subsequent interaction with metamorphic country rocks. The range of d11B values determined for hydrothermal tourmalines are relatively wide and falls at the lighter end of the range for typical continental crust.

In order to investigate deformation history preserved in the calcite twins in the hinterland of Zagros, several samples have been collected from calcschists of the Paleozoic Sargaz complex in the Faryab area, SE Iran. These samples are related to F1-recumbent folding and thrust shear zones. The twin width is about 1 and 3.8 mm (thin-twin regime); the twin strain amounts 5 and 10%; twin intensity is about 24.8 and 72.2 twins.mm-1. Based on the upper crust frictional stress equilibrium hypothesis, calculated differential stress values, of about 200 MPa, suggest that twinning occurred at depth about 7-8±1 Km. Together with twin morphology which indicates that twinning developed under low T conditions (between 160 and 230°C), this suggest that twinning occurred at lower temperature and shallower depth than the reported greenschist facies. Calcite C-axis fabrics therefore show a low - temperature, post-tectonic (post F1-folding) pattern. The results of Calcite C-axis fabrics reveal that the compressional stress axes are oriented NE-SW. Based on the age of samples together with timing of twinning relative to F1-folding and thrusting, this regional compressional stress is likely related to oblique subduction of NeoTethys beneath Central Iran in Middle Triassic. All of results support that twinning developed as a late, post-metamorphism deformational event and reveal that the Paleozoic Sargaz complex is jacked-up by underplating process toward the lower-temperatures and shallower depths during the oblique subduction of Neo-Tethys beneath Central Iran.

The Upper Cretaceous Ganj complex, a part of the Jazmurian ophiolitic belt, is located on the western boundary of Jazmurian depression and separated from Kahnuj ophiolitic complex by north-south trending Jiroft fault. The complex consists of lava flows, pillow lavas, acidic plutonic and sedimentary rocks which are intruded by northwest-southeast trending dykes. It does not resemble a classical ophiolitic sequence due to lacking of intrusive crustal and mantle sections. The basaltic pillow lavas occur as flattened-tubular shape normal and mega sized bodies with bread crust crack surfaces. They show three textural zones from surface to interior: glassy, glassy and crystalline, and holycrystalline. Each zone characterized by different textures and varying assemblages of plagioclase ± olivine ± pyroxene and opaque. The glassy surface of the pillows frequently consists of one or rarely multiple rinds: sideromelane, dark tachylyte; and tachylyte with elongated vesicles. On Nb/Y versus Zr/TiO2 and SiO2 versus Nb/Y diagrams the pillow lavas plot in the field of basalt and sub-alkaline respectively. The relatively low immobile trace elements ratios are another sign of their tholeiitic nature. The absence of Eu anomaly on chondrite-normalized REE patterns suggests insignificances of plagioclase fractionation, or magma was relatively oxidized. They are similar to transitional basalts that lie between enriched MORB and OIB and some BABB. However enrichment in incompatible elements, depletion in Nb and low La/Nb ratios (0.94-1.81) are signature of BABB. They were formed by 15-30% partial melting of plagioclase lherzolite where fractionation was controlled by removal of olivine, spinel and clinopyroxene.

We study (v-) umbilic (space-like) submanifolds of pseudo-Riemannian space forms, then define totally semi-umbilic space-like submanifold of pseudo Euclidean space and relate this notion to umbilicity. Finally we give characterization of total semi-umbilicity for space-like submanifolds contained in pseudo sphere or pseudo hyperbolic space or the light cone. A pseudo-Riemannian submanifold M in M- (a pseudo Riemannian manifold) is called v -umbilic if the shape operator of M along V Î^c^ (M ) is S=lidTM for some lÎC¥(M) . A totally semi-umbilical space-like submanifold of a pseudo Euclidean space is an space-like sub manifold for which the curvature ellipse degenerates into a segment at every point except perhaps at isolated points. One of our main results says that if Mn is an space-like (immersed) sub manifold of RPn+m  n³2 , then M is totally semi-umbilical and , C ∏x , BÕx (some special normal vectors) are in the same direction for every x ÕÎT xM and all (except isolated) points of M, if and only if there exist linearly independent normal fields Vn+1,…..,Vn+m-1 locally defined at every non-umbilical point of M, such that M is Va-umbilical, n+1£a £n+m-1.

Let p ³ 1 and ( Wn) n w be a sequence with non-negative entries. If (tn,k) ³0, denote by ||T||p,x the infimum of those U satisfying the following inequality:(S¥n=1wn(S¥k=1 tn,k ak)p)1/p £U (S¥k=1 WKAPK)1/P ,whenever ( an) ∈lp (w ) n p a ∈l w . The purpose of this paper is to give an upper bound for the norm of operator T on weighted sequence spaces d(w,p) and lp(w) and also e(w,¥). We considered this problem for certain matrix operators such as Norlund, Weighted mean, Ceasaro and Copson matrices. This problem is considered by some authors like Bennett, Jamson and the first author on sequence spaces lp and weighted sequence spaces for some kind of matrix operators. Also, this study is an extension of paper by Chang-Pao Chen, Dah-Chin Luor and Zong-Yin Ou.

In this research we work with the effective Hamiltonian and the quark model. We investigate the decay rates of matter-antimatter of b quark. We describe the effective Hamiltonian theory and apply this theory to the calculation of current current (Q1,2 ), QCD penguin (Q3,...,6 ), magnetic dipole (Q8) and electroweak penguin (Q'7,…10 ) decay rates. The gluonic penguin structure of hadronic b decays b®q g ®qkqiqj- q is studied through the Wilson coefficients of the effective Hamiltonian. We calculate the branching ratios of the tree-level, effective Hamiltonian, effective Hamiltonian including electroweak Penguin, effective Hamiltonian including Magnetic Dipole and the effective Hamiltonian including electroweak Penguin and Magnetic Dipole b quark decays b® qkqiqj-, qiÎ{u,c}, qkÎ{d,s}, qj‾Î{u-,c-} . We show that, the electroweak Penguin and Magnetic Dipole contributions in b quark decays are small and Current-Current operators are dominant.