University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 STIGMA OF DATURA STRAMONIUM L. (SOLANACEAE): HISTOGENESIS, MORPHOLOGY AND DEVELOPMENTAL ANATOMY - 31823 EN Journal Article The structure and histogenesis of the stigma of Datura stramonium was investigated by light and scanning electron microscopy to determine the developmental origin of the transmitting tissue and “wet stigma”. Four developmental stages were defined on the basis of bud length. Stage one, the histogenesis stage, was comprised of buds 2-15 mm in length. Stage two, signified by the growth and development of the stigma was comprised of buds 15-40 mm long. Stage three, with buds of 40-60 mm in length, represented a receptive and mature stigma. Stage four started with self pollination (occurs prior to anthesis) and ended with stigma senescence. A developing stigma showed a bilobed, papillated surface, covered with sticky secretion. The stigma consisted of two distinct zones; 1) Superficial zone; formed by papillae and 5-8 layers of secretory cells immediately beneath them. This zone was subjected to a gradual lysis in the ontogeny of the stigma. 2) Internal zone; formed by the transmitting tissue of the style. This zone remained intact throughout the development. Transmitting tissue and stigma both originated from the epidermis of the carpels. Similarities in structural organization of the stigma of Datura to those reported in Solanum tuberosum were considerable. https://jsciences.ut.ac.ir/article_31823_3124f20ae7f8b97d325e86b1acfb7d3c.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 IDENTIFICATION OF MOLECULAR MARKERS LINKED TO LEAF CURL VIRUS DISEASE RESISTANCE IN COTTON - 31824 EN Journal Article The identification of molecular markers linked to leaf curl virus (CLCuV) disease resistance in cotton has the potential to improve both the efficiency and the efficacy of selection in cotton breeding programs. Genetic analysis suggested that CLCuV resistance is controlled by a single dominant gene. In this study, an interspecific F2 population derived from a cross of Gossypium barbadense and Gossypium hirsutum was phenotypically classified into CLCuV susceptible and resistant plants. A subset of these F2 plants was evaluated by selective genotyping, with restriction fragment length polymorphism (RFLP) to identify DNA markers linked to the CLCuV resistance gene. Sixty seven F2 derived F3 families were evaluated for segregation at 137 RFLP loci. Three DNA marker loci, linked to each other, also showed significant association with CLCuV resistance. Sequencing of linked markers will permit locus-specific DNA primers for use in PCR-based identification of CLCuV-resistant plants in breeding populations. https://jsciences.ut.ac.ir/article_31824_d4d9dd228996e12e46d286639eccd3e1.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 STUDY ON CHANGES OF PROTEINS, ENZYMES AND CHROMOSOME NUMBER IN REGENERATED PLANTS OF WHEAT (TRITICUM AESTIVUM L.) - 31825 EN Journal Article Somaclonal variation is one of the possible sources of variation in plant breeding. To evaluate the usefulness of somaclonal variation for creating variation in Iranian cultivars of wheat, proteins, enzymes and chromosome number of regenerated and seed-produced plants of wheat (Alamout, Hyrmand and Maroon) were studied. Plantlets obtained from the immature embryos and seed culture were collected and used for studying proteins, peroxidases, polyphenoloxidases and superoxidedismutases by using Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and PAGE. The root tips of plantlets were used for chromosome counting. In the SDS-PAGES system, regenerated plants had 5 additional protein bands. The number of protein bands in PAGE system were less than the SDS-PAGE system but the later system represented a greater difference between seed-produced plants and regenerated plants. Peroxidase had 6 isozymes, 3 of which were similar among all plants. Nine isozymes of superoxidedismutase were found, 5 of which were common in all. Polyphenoloxidase showed no changes in regenerated plants. Cytological study of the three regenerated cultivars indicated the Maroon cultivar to possess a greater chromosome number (2n=54 or 60) than the other two (2n=6x=42). Somaclonal variation was observed in cultivars, but the nature of variation was different. https://jsciences.ut.ac.ir/article_31825_d9f81c55a64eb1324cbe20c56cf59374.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 SPREAD OF THE GLUCOSE-6-PHOSPHATE DEHYDROGENASE VARIANT (G6PD-MEDITERRANEAN) IN ONE OF THE COASTAL PROVINCES OF CASPIAN SEA IN IRAN - 31826 EN Journal Article In order to explore the nature of glucose-6-phosphate dehydrogenase (G6PD) deficiency in one of the coastal provinces of the Caspian Sea (Mazandaran) in Iran, we have analysed the G6PD gene in 74 unrelated G6PD-deficient males (2-6 year children) with a history of Favism, by using PCR and subsequent digestion by appropriate restriction enzymes, looking for the presence of certain known mutations. The results showed that 49 of 74 cases (66.21%) had the G6PD Mediterranean genotype and there were not other known mutations (such as G6PD Aures, G6PD A, and G6PD A–) in rest of the samples. This is the first report on the molecular analysis of G6PD mutations in north of Iran and we have revealed the frequency and distribution of the most common G6PD variant (G6PD-Mediterranean) in this area. https://jsciences.ut.ac.ir/article_31826_7e0a4d112e3f40b8f6decb2a7c365f91.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 ON-LINE SOLID-PHASE EXTRACTION AND LIQUID CHROMATOGRAPHY/PARTICLE BEAM-MASS SPECTROMETRY FOR DEGRADATION STUDIES OF SOME POLAR PESTICIDES IN WATER - 31827 EN Journal Article An on-line automated method for photodegradation studies of isoproturon, diuron, atrazine, fenitrothion, and metoxuron by means of liquid chromatography/mass spectrometry (LC/MS) with particle beam (PB) interface is described. Surface water samples were first spiked with 50 µg/l of each pesticide and then exposed to the radiation of the medium-pressure mercury lamp. Next, in regular intervals of 60 min, aliquots of 50-ml sample were enriched on a solid-phase extraction (SPE) cartridge and eluted on-line by a gradient of LC eluent onto analytical column for separation, followed by MS detection. Photodegradation experiment was performed twice with each pesticide, with MS operated in electron ionization (EI) and positive chemical ionization (PCI) modes and ammonia as reagent gas. Additional spectral and quantitative information was obtained from ultraviolet diode-array detector (UV DAD) placed in-line between the outlet of the analytical column and MS detector. A great number of photodegradation products (DPs) of parent pesticides were detected and in numerous instances, tentatively identified. The appearance of several degradation products is reported for the first time. https://jsciences.ut.ac.ir/article_31827_663aa1f4a67d9cf37f2d4f7061e06769.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 TEMPLATE SYNTHESIS, CHARACTERIZATION OF HIGHLY UNSYMMETRICAL TETRADENTATE SCHIFF BASE COMPLEXES OF NICKEL (II) AND COPPER (II) - 31828 EN Journal Article Nickel (II) and copper (II) complexes of highly unsymmetrical tetradentate Schiff base have been synthesized by the template reaction of half-units N-(1-hydroxy-2-acetonaphtone)-1-amino-2-phenyleneimine (HL) and N-(2-hydroxyacetophenone)-1-amino-2-phenyleneimine (HL1) with the glyoxalphenylhydrazone. The complexes have been characterized by elemental analyses, conductance, IR, 1H NMR and UV spectroscopy. https://jsciences.ut.ac.ir/article_31828_73eedb4032af35e2b57a3195bd433b2a.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 PALYNOSTRATIGRAPHY AND PALAEOBIOGEOGRAPHY OF LOWER PALAEOZOIC STRATA IN THE GHELLI AREA, NORTHEASTERN ALBORZ RANGE OF IRAN (KOPET-DAGH REGION) - 31829 EN Journal Article https://jsciences.ut.ac.ir/article_31829_f1a83118e2c5697f6679b2ce354e7f8d.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 SOLUTION OF AN INVERSE PARABOLIC PROBLEM WITH UNKNOWN SOURCE-FUNCTION AND NONCONSTANT DIFFUSIVITY VIA THE INTEGRAL EQUATION METHODS - 31830 EN Journal Article In this paper, a nonlinear inverse problem of parabolic type, is considered. By reducing this inverse problem to a system of Volterra integral equations the existence, uniqueness, and stability of the solution will be shown. https://jsciences.ut.ac.ir/article_31830_444a6e426b16657ced4ab9e2308c1f97.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 RESIDUAL SOLUBILITY OF SF-GROUPS - 31831 EN Journal Article Seifert Fibre Groups (SF-Gps) have been introduced and their first derived groups have been worked out in an earlier paper by the author [2,3]. Now we aim to prove that they are residually soluble and residually finite. https://jsciences.ut.ac.ir/article_31831_b8df2222fc55ee587a2efd7b5577d91b.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 A GENERALIZATION OF A JACOBSON’S COMMUTATIVITY THEOREM - 31832 EN Journal Article In this paper we study the structure and the commutativity of a ring R, in which for each x,y ? R, there exist two integers depending on x,y such that [x,y]k equals x n or y n. https://jsciences.ut.ac.ir/article_31832_115bc51524f29ca721174801df38a2a8.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 11 4 2000 12 01 THE SPINLESS SALPETER EQUATION AND MESON DYNAMICS - 31833 EN Journal Article Applying the variational method, the spinless reduced Bethe-Salpeter (RBS) equation is solved for the mesonic systems, and the mass spectra are obtained. The method is applied to the Hamiltonian with the Gaussian and hydrogen-type trial wave functions, and different potential models are examined. The results for the different potentials are in challenge in light mesons, while they are consistent in heavy mass region. In spite of this, the consistency for all mesons occurs in Power-law (Rosner, …), Logarithmic (Quigg and Rosner), and potentials and the theoretical results are in general in agreement with the experimental data. The inconsistency in light mesons has the origin in the nonrelativistic treatment of the potential derivations and the reduced form of the Bethe-Salpeter equation. The consistent and non-consistent interquark potentials show a distinct behaviour at both short and long distances. https://jsciences.ut.ac.ir/article_31833_0bff2aa05a6d99cad062133e6c589de1.pdf