@article { author = {}, title = {NOVEL AZOLYLALKYLTHIO, -SULFOXY, AND -SULFONYL COMPOUNDS WITH ANTIPICORNAVIRAL ACTIVITY}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {A novel series of azolylalkylthio, -sulfoxy, and-sulfonyl compounds was designed, synthesized, and evaluated for antipicornaviral activity. Two compounds (4i and 4 1) exhibited significant activity against various serotypes of human rhinovirus (HRV). It was found that incorporation of hydrophobic azoles such as 3-methylisoxazole or 4-methylthiazole led to increased activity. In addition, activity markedly improved when the size of the thio substituent was increased. oxidation of the thio derivatives to the corresponding sulfoxides and sulfones resulted in less active compounds. 2-[6- [(5- chlorobenzimidazol-2-yl)thio]hexyl]-4-methylthiazole (4 1) was found to exhibit activity against HRV comparable tb Disoxaril, and was also effective against the Coxsackie B 1 virus}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31140.html}, eprint = {https://jsciences.ut.ac.ir/article_31140_9af6439006d2aa3de37ca19f4d4edde4.pdf} } @article { author = {}, title = {QUANTITATIVE AND QUALITATIVE CHANGES IN SHOOT APICAL MERISTEM OF SAFFRON CROCUS DURING THE PERIOD OF GROWTH AND DEVELOPMENT}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31141.html}, eprint = {https://jsciences.ut.ac.ir/article_31141_a605ed08833ff10e9c98dfc6d25a1588.pdf} } @article { author = {}, title = {QSARS OF ANTI-FUNGAL ACTIVITY OF FURAN CARBOXANILIDE DERIVATIVES AGAINST WILD AND MUTANT STRAINS OF USTILAGO MAYDIS}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {The structural requirements for the inhibitor activity of various furan carboxanilide derivatives against succinate dehydrogenase complex (SDC) activity in mitochondria of either wild or mutant strains of Ustilago maydis were investigated with the aid of Hansch QSAR analysis. It has been found that the inhibitor activity against both types of enzymes is best related to the ??? or ??M of the substituents on the phenyl ring and to the hydrophobicity of substituents at ortho (with negative slope) and meta position (with positive slope). Similarly, the activity- decreases with the increase in the width of substituents at ortho position. However, while the activity decreases with the increase in the width of substituents at para position of phenyl ring for the wild type enzyme, the reverse is true for the mutant type enzyme. Moreover, in spite of wild type enzyme, the activity against mutant type enzyme 'is related to the presence of a hydrogen acceptor group at meta position of the phenyl ring. These data indicate that the difference between wild and mutant types of SDC enzymes in the U. maydis has been brought about by the appearance of an amino acid residue with the ability to form hydrogen binding in the active site of the mutant enzyme}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31142.html}, eprint = {https://jsciences.ut.ac.ir/article_31142_9ae83a7d76639dba6e2297d769d3e5f0.pdf} } @article { author = {}, title = {PRODUCTION OF BETA-GALACTOSIDASE IN SUBMERGED MEDIA BY ASPERGILLUS ORYZAE, PTCC 5 163}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {Different compositions of liquid media were used for their efficacy in the production of beta-galactosidase by Aspergillus oryzae in submerged fermentation. Enzyme production was improved by switching from lactose-based media to soybean meal- and wheat bran-based media. Further improvement was made when the soybean meal medium was supplemented with sodium nitrate and magnesium sulfate. Results also indicate that fungal extracellular beta-galactosidase production occurs concomitantly with growth on complex media but not on lactose- based media. The effectiveness of Tween 80 on beta-galactosidase activity was found to depend on the type of the medium used}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31143.html}, eprint = {https://jsciences.ut.ac.ir/article_31143_6b51cb27e22e0e55a0b0212612939486.pdf} } @article { author = {}, title = {SPECTROPHOTOMETRIC STUDY OF THE STOICHIOMETRY AND CONDITIONAL STABILITY CONSTANTS OF SOME TRIVALENT METAL ION COMPLEXES OF METHYLTHYMOL BLUE}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {Complexation reactions between methylthymol blue and Fe , A l ,Ga , 1n a nd TI ions have been studied in buffer aqueous solutions of pH 5.0 at 2S°C by a spectrophotometric technique. The conditional stepwise stability constants of the resulting 1:l and 1:2 (metal-to-ligand) complexes were determined from the absorbance-mole ratio data at three different wavelengths of the visible spectra. The overall stabilities of the resulting complexes vary in the order A l > Fe > G a = 1n > T1 .}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31144.html}, eprint = {https://jsciences.ut.ac.ir/article_31144_52b94d7d9fb70be3a41cd79893de9fee.pdf} } @article { author = {}, title = {SYNTHESIS AND CRYSTAL STRUCTURE OF [Pph ] [WS (CUNCS) ] A. Taeb A. Beheshti and N.K. Javadi SYNTHESIS AND CRYSTAL STRUCTURE OF [Pph ] [WS (CUNCS) ]}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {The crystals of [WS (CuNCS) ] anion have been isolated from CH ,CI solution and examined by X-ray structural analysis as well as by IR spectroscopy. The unit cell is monoclinic with a= 14.3796(13), b= 18.039(1 I), c= 22.5956(23)& P= 96.053(8)', space group P2,/n (14), Z= 4. The crystal structure was refined by the least-squares calculations to a final R-value of 0.0398(Rw= 0.0443) for 2777 unique observed reflections [F>3o IFI].}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31145.html}, eprint = {https://jsciences.ut.ac.ir/article_31145_92ca309aaf066bbd7e466817a509ec6c.pdf} } @article { author = {}, title = {SYNTHESIS OF ?-PYRONEIMINE N-OXIDE A NOVEL NITRONE WITH ELECTRON RELEASING SUBSTITUENT}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {N-Oxidation of 1,4-dihydro-2,6-dimethyl-1- phenyliminopyridine (7) with several peracids was attempted. The main compound obtained was l-phenyl- 2,6-dimethyl-4-pyridone (8), instead of the expected N-oxide (2). The reaction of phenylhydroxylamine with dimthylrnethoxypyroxonium perchlorate, however, successfully gave the N-oxide (3), which belongs to a class of nitrones in which the diazomethine N-oxide group is conjugated with an electron releasing center.}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31146.html}, eprint = {https://jsciences.ut.ac.ir/article_31146_0b5d64c33d68295775777050edccd115.pdf} } @article { author = {}, title = {SYNTHESIS OF SOME NEW 3-HETEROCYCLYL- 1,2,3-BENZOTRIAZIN-4(3H)-ONES}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {Some new 3-heterocyclyl-1,2,3-benzotriazin-4(3H)-ones (7a-f) were prepared in moderate to good yields by nitrosation of N-heterocyclyl-2- aminobenzanilides (6a-f). The latter were obtained by hydrazine hydrate-graphite reduction of corresponding N-heterocyclyl-2-nitrobenzanilides (5a-f)}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31147.html}, eprint = {https://jsciences.ut.ac.ir/article_31147_600e1ec69bbeff7f2785b36dcda8199f.pdf} } @article { author = {}, title = {ALKALOIDS OF PAPAVERACEAE (XIV) [I]. ALKALOIDS OF G U UCIUM FIMBRILLIGER UM BOISS ., POPULATION GADUK}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {Glauciumfimbrilligerum Boiss. population Gaduk of Abbasabad contained three major alkaloids, bulbocapnine (0.5%), isocorydine (0.12%), proptopine (0.2%), and three minor alkaloids, salutaridine (0.01%), N-methyllindcarpine (0.02%) and thaliporphine (0.003%). Bulbocapnine, salutaridine and thaliporphine were detected for the first time in G.fimbril1igeru.m Boiss}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31148.html}, eprint = {https://jsciences.ut.ac.ir/article_31148_a7309b44ec40b3aebb3da72a277fd96c.pdf} } @article { author = {}, title = {JUVENILE GASTROPODS FROM THE UPPER DEVONIAN CEPHALOPOD BEDS AND ADJACENT STRATA OF CENTRAL IRAN}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {Microgastropod fauna from the Upper Devonian Cephalopod Bed and overlying Lower Tournaisian strata of the original reference section of the Shishtu Formation have been examined. Twenty genera and one unknown genus have been identified. The original aragonite shells have been replaced either by pyrite or fluorapatite}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31149.html}, eprint = {https://jsciences.ut.ac.ir/article_31149_4987a0615b4c941570535ed91dfe835c.pdf} } @article { author = {}, title = {ESTIMATING THE MEAN OF INVERSE GAUSSIAN DISTRIB WTION WITH KNOWN COEFFICIENT OF VARIATION UNDER ENTROPY LOSS}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {An estimation problem of the mean µ of an inverse Gaussian distribution IG(µ, C µ) with known coefficient of variation c is treated as a decision problem with entropy loss function. A class of Bayes estimators is constructed, and shown to include MRSE estimator as its closure. Two important members of this class can easily be computed using continued fractions}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31150.html}, eprint = {https://jsciences.ut.ac.ir/article_31150_e6495458c2b2f55ab4f53eb88e6891a8.pdf} } @article { author = {}, title = {LASERS WITHOUT INVERSION: DENSITY OPERATOR METHOD}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {A quantum theory of a two and three-level laser with injected atomic coherence is developed by using a density operator method, to the best of our knowledge, for the first time. The initial atomic coherence plays an essential role. At steady state, the equation of motion for the density operator yields to exhibit laser without inversion and a phase locking but no threshold for the laser field. The Fokker-Planck equation is also derived for three level lasers and the laser action is analyzed in terms of the coefficients of this equation which results in the quantum noise quenching. One of the most important aspects of our method is its capability to analyze the coherently pumped laser action in N-level systems in a simple fashion}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31151.html}, eprint = {https://jsciences.ut.ac.ir/article_31151_9afa47cb329d9e4a0b9b090f659a824a.pdf} } @article { author = {}, title = {BOSE-EINSTEIN CORRELATIONS IN PION PRODUCTION AT TRISTAN}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {8}, number = {1}, pages = {-}, year = {1997}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {Measurement of Bose-Einstein correlations in the production of like-signed pion pairs has been made with the AMY detector at TRISTAN. An event sample of 10120 hadronic events with ranging between 50 to 61 GeV was used. These measurements indicate a strength of the enhancement of ? = 0.61M.07, with a typical correlation size of Ro = 1.16±.08 fm. This value of ? is consistent with measurements at lower energies; however, Ro is somewhat larger than lower energy results have indicated}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31152.html}, eprint = {https://jsciences.ut.ac.ir/article_31152_975a9023852f768ec27f6a75441c0545.pdf} }