2008
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Localization and Study of Histochemical Effects
https://jsciences.ut.ac.ir/article_31902.html
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A high capacity for accumulation of Mn was reported for sunflower plants. Localization of excess Mn is therefore of special interest for understanding metal tolerance mechanisms in this species. In this study, structural and histochemical alterations caused by Mn accumulation in leaves were investigated in sunflower (Helianthus annuus L. cv. Azarghol) plants grown in nutrient solution. In the presence of excess Mn (up to 100 µM) shoot and root accumulated up to 45 mg Mn g1DW concomitant with an increased activity of peroxidase, but not catalase. Symptoms were observed in mature leaves of plants as small darkbrown to black spots associated with the leaf trichomes. In the short uni or multicellular leaf hairs the entire trichome was blackened, while there was a blackened basal cell or tip cell in the long linear multicellular trichomes. No dark deposition was observed either in the tip or in the base of the spiral multicellular trichomes. Epiillumination method revealed a dense dark discoloration of small veins of areoles in mature leaves of Mn treated plants with a high autofluorescence, suggesting accumulation of phenolics. Histochemical methods for callose, lipids, lignin and proteins showed no change in Mn treated leaves; while a significant decrease of starch grains was observed using polysaccaride identification test. Bleaching of dark spots by ethanol and lack of autofluorescence in the locations of leaf trichomes as well as result of histochemical methods for free and bound phenolics suggested strongly that the dark spots are the locations of MnO2 deposits.
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Molecular Surveying of the Common Variants of Glucose 6Phosphate Dehydrogenase Gene in Deficient Patients
https://jsciences.ut.ac.ir/article_31903.html
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Glucose 6phoshphate dehydrogenase is Xchromosome linked that expressed in all tissues. This is the first enzyme of pentose phosphate pathway were 5carbon sugar Ribose and NADPH were synthesized by coupled oxidation /reduction reactions and this enzyme is a highly polymorphic enzyme in humans. G6PD deficiency are shown to be the cause of haemolytic effect of Fava beans and primaquine. It soon became apparent that G6PD deficiency was a widespread genetic defect and hereditary deficiency of G6PD turned out to be among the most common genetic disorders, affecting more than 400 million people worldwide. G6PD deficiency is actually the most common clinically important enzyme defect. In this study, we have analyzed peripheral blood samples of 119 patients with a history of favism in Kerman and Yazd in central part of Iran. DNA was extracted from leukocyte and analyzed for four known G6PD mutations (Mediterranean, Chatham, Cosenza and A(202)) by PCRRFLP technique. The results showed that Mediterranean mutation at nt563(CA) is the most predominant mutation in this area 63.5% (Kerman: 63%, Yazd: 64%) and 1.68% of patients had Chatham mutations but none of samples was found to have Cosenza and A(202) mutations. In this paper, we also try to document other disorders such as Malaria in mentioned patients.
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Synthesis and Antitubercular Activity of N3,N5Diaryl4(5arylisoxazol3yl)1,4dihydropyridine
https://jsciences.ut.ac.ir/article_31904.html
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5Arylisoxazolyl3carboxaldehydes were condensed with Naryl acetoaceta¬mide and ammonium acetate in methanol to give N3,N5diaryl4(5arylisoxazol3yl)1,4dihydropyridine3,5dicarboxamides. All compounds were screened for their antitubercular activity against Mycobacterium tuberculosis (H37Rv). The results for new synthesized compounds showed a moderate activity in comparison to rifampicin.
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Biotite and Hornblende Composition Used to Investigate the Nature and Thermobarometry of Pichagchi Pluton, Northwest SanandajSirjan Metamorphic Belt, Iran
https://jsciences.ut.ac.ir/article_31905.html
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Pichagchi pluton is situated in the northeastern part of the Soursat complex in SanandajSirjan metamorphic belt of Iran. The pluton with the age of 74.20 Ma is composed mainly granodiorite, diorite, and tonalite in which mafic minerals are biotite and amphibole. In this study, composition of minerals used to describe the nature of the granitic magma and estimate the pressure and temperature at which Pichagchi pluton is emplaced. Based on chemistry of biotites Pichagchi pluton formed from calcalkaline magma. This type of magma is typically produced in subduction environments. It means that the pluton could have formed in an orogenic suit from calcalkaline magma in subduction zone. The results obtained based on biotite chemistry compare well with the previous interpretations on the SanandajSirjan belt. Temperatures of emplacement calculated with the hornblendeplagioclase thermometer range from 615 °C to 691 °C. Aluminuminhornblende geobarometry indicate that the Pichagchi pluton was emplaced at pressure of 3.804.24 Kbar.
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On Regularity of Acts
https://jsciences.ut.ac.ir/article_31906.html
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In this article we give a characterization of monoids for which torsion freeness, ((principal) weak, strong) flatness, equalizer flatness or Condition (E) of finitely generated and (mono) cyclic acts and Condition (P) of finitely generated and cyclic acts implies regularity. A characterization of monoids for which all (finitely generated, (mono) cyclic acts are regular will be given too. We also show that monoids for which all regular right acts are WPF, WKF, PWKF, TKF or satisfy Conditions (P), (WP) and (PWP) are the same as those for which all regular right acts are projective or strongly flat. Monoids S with E(S)?C(S) or those for which every element of E(S){1} is right zero will be characterized, when all (finitely generated, cyclic) right Sacts satisfying Conditions (PWP), (WP), (PE) or (P) are regular. Simple monoids for which all (finitely generated, cyclic) right acts with property U (U is a property of acts over monoids implied by Condition (P)) are regular will be characterized too.
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Asymptotic Distributions of Estimators of Eigenvalues and Eigenfunctions in Functional Data
https://jsciences.ut.ac.ir/article_31907.html
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Functional data analysis is a relatively new and rapidly growing area of statistics. This is partly due to technological advancements which have made it possible to generate new types of data that are in the form of curves. Because the data are functions, they lie in function spaces, which are of infinite dimension. To analyse functional data, one way, which is widely used, is to employ principal component analysis, allowing finite dimensional analysis of the problem. The authors gave stochastic expansions of estimators eigenvalues and eigenfunctions, providing not only a new understanding of the effects of truncating to a finite number of principal components, but also pointing to new methodology, such as simultaneous and individual bootstrap confidence statements for eigenvalues and eigenfunctions. The expansions explicitly include terms of sizes n?1/2, n?1, and a remainder of order n?3/2, where n denotes sample size. The terms of size n?1/2 are related to limit theory. Because for many situations, the exact statistical properties of the eigenvalues and eigenfunctions estimators are not directly obtainable, the way by which we can approximate their distributions is of interest in practice. In this paper, we discuss asymptotic results for eigenvalues and eigenfunctions. The work shows that eigenvalue spacings have only a secondorder effect on properties of eigenvalue estimators, but a firstorder effect on properties of eigenfunction estimators.
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Asymptotic Behavior of Weighted Sums of Weakly Negative Dependent Random Variables
https://jsciences.ut.ac.ir/article_31908.html
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Let be a sequence of weakly negative dependent (denoted by, WND) random variables with common distribution function F and let be other sequence of positive random variables independent of and for some and for all . In this paper, we study the asymptotic behavior of the tail probabilities of the maximum, weighted sums, randomly weighted sums and randomly indexed weighted sums of heavytailed weakly negative dependent random variables, say, , , , and , respectively, where are bounded positive real numbers and N is a nonnegative integervalued random variables, independent of and for all . In fact, for a large class of heavytailed distribution functions, we show that the asymptotic relations,
,
hold as Finally, if and also is a sequence of identical independent positive random variables, then we prove that
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