University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 REGENERATION OF NEOFORMANT ORGANS FROM ORGAN-PARTS OF SOME CROCUS SPECIES - 31095 EN Journal Article Explants of leaves, petals, anthers, styles and ovaries of C. speciosus, C. cancellatus, C. gilanicus and C. almehensis were cultured on LS media with three different combinations of NAA and BAP in the dark. Callus and neoformant organs (leaf and corm-like structure and ordinary and contractileroots) were fomd on some of these explants. Corm explants from these species were also cultured on MS media with different combinations of NAA, BAP, Kin, zeatin and 2,4-D in the dark. Callus formation and corm, shoot and root regeneration were observed on corm explants from some of these species. https://jsciences.ut.ac.ir/article_31095_3c12c84af346626dc2f1b77e52bb301e.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 SYNTHETIC STUDIES IN THE 6H-[1,2,4] TRIAZINO [3,4-b] [ 1,3,4] THIADIAZINES - 31096 EN Journal Article 4-Amino-6-methyl- 1,2,4-triazine-3(2H)-thione-5-0ne (1) was condensed with propargyl bromidein the presence of sodium rnethoxide to afford 3-propargylmercapto- 4-arnino-6-rnethyl-1,2,4-triazin-5-one(2) . Transformation of the latter to 8-dihydro- 3-methyl-7-methylene-4-oxo-6H-[1,2,4]TRIAZINO [3,4-b] [1,3,4] thiadiazine (3) was performed under the condition of palladium (II) salt. Ring closure of (1) withphenacyl bromide provides the 3-methyl-7-phenyl-4-0x0-6h [1,2,4]triazino[3,4-b] [1,3,4] THIADIAZINE. https://jsciences.ut.ac.ir/article_31096_5ea1e18a88ae60182918e2fd6f5c6672.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 SYNTHESIS OF 1, l1-DIHYDROXY-2,2'- (THIODIMETHYLENE) BIS-9(1 OH)-ANTHRONE - 31097 EN Journal Article An efficient synthesis of the 1,l'-dihydroxy-2,2'-(thiodimethy1ene)bis-9(10H)- anthrone (5) is described. Reaction of 1 -methoxy-2-(bromomethy1)-9,lOanthraquinone (1) with excess sodium sulfide in ethanol, demethylation to the corresponding hydroxy and subsequent selective reduction produced the title compound in high yield. https://jsciences.ut.ac.ir/article_31097_507a08d46df3369ee992dae0ad39b856.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 ONE-DIMENSIONAL TREATMENT OF HYDROGEN BOND PART 2 - 31098 EN Journal Article The potential function of Lippincott and Schroeder for linear hydrogen bond has been re-examined and extended to nonlinear hydrogen bond. The parameters originally introduced to the potential function by Lippincott and Schroeder have been determined from the structural parameters such as 0.. .Odistance 0-H bond distance, H.. .O distance and HOO angle. Thevalidity of harmonic oscillator approximation for calculation of OH stretching frequency from the second derivative of this serniempirical potential function has been investigated. https://jsciences.ut.ac.ir/article_31098_88c9c159e8ca183ba0188b2303662550.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 NEW SUBFAMLY, GENUS AND SPECIES OF LOWER CARBONIFEROUS RUGOSE CORALS FROM CENTRAL ALBORZ (N. IRAN) - 31099 EN Journal Article Carboniferous strata in the Alborz mountains consist of calcareous rich fossils the main part of which is composed of rugose corals. There have been few studies carried out on corals so far. In this paper, a new subfamily, genus and eight new species of rugose corals from Mobarak limestones in the central Alborz mountains are introduced https://jsciences.ut.ac.ir/article_31099_8d6b31ed2ba3ecd5a1c7a80773f01ec2.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 ON THE GENERALIZATION OF N-PLE MARKOV PROCESSES - 31100 EN Journal Article The notion of N-ple Markov process is defined in a quite general framework and it is shown that N-ple Markov processes-arel inear combinationso f some martingales https://jsciences.ut.ac.ir/article_31100_77c33d0fb152118e33778d34ae8a0473.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 IRRELEVANT ATTACHED PRIME IDEALS OF A CERTAIN ARTINIAN MODULE OVER A COMMUTATIVE RING - 31101 EN Journal Article Let M be an Artinian module over the commutative ring A (with nonzero identity) and a p spec A be such that a is a finitely generated ideal of A and aM = M. Also suppose that H = H where H. = M/ (0: a )for i <O and H = M for i 0; and = A[ aT,T ] istheReesring of A withrespect toa (Tis anindeterminate). In [12] it is shown that H is an -module. In this paper, we give various conditions under which the prime ideal (p, aT, T ) is an attached prime ideal of (0: T ) as an module. https://jsciences.ut.ac.ir/article_31101_485f1d0ae76a063a524f0c6315e93e74.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 ORGANIC PHOTOCONDUCTOR TTF-TCNQ (TETRATHIAFULVALENETETRACYANOQUINODIMETHANE): A POTENTIAL ROOM TEMPERATURE INFRARED DETECTOR AT 10 ?m H. R. Mohajeri Moghaddam* and N. Peyghambarian - 31102 EN Journal Article The absorption properties of charge transfer organic semiconductor TTF-TCNQ (tetrathiafulvalene-tetracyanoquhodimete ) filmsdeposited on KBr singlecrystal, quartz and glass substrates in far infrared have been investigated. An absorption edge at ?10 ??m was observed. Photoconductivity, photoconduction efficiency and gain and photocarrier's lifetime have been measured. The results show an electric field dependent photoconductivity.At an applied voltage of 14 V the photoconductivity reaches 1.2 (ohm-cm) which is almost the same as that of its DC dark conductivity, i.e. 1.8 (ohm-cm) . Low temperature results show that the performance of the detector does not improve, but the field dependency, which was shown at room temperature, did not occur at low temperatures. The laser power dependency of the photocarriers showed that a single photon absorption process is involved. Slight deviation from linear dependency could be attributed to trapping in the band gap. It was concluded that the material may potentially be used as a CO laser detector https://jsciences.ut.ac.ir/article_31102_5eef269207a5f1914c93407bed2d9ab8.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 2 1996 06 01 LEWIS-BASE ADDUCTS OF LEAD(II) COMPOUNDS VI.* SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF MONONUCLEAR (DIACETATO-0,O ')(1, 10-PHENANTHROLINE) - 31103 EN Journal Article The synthesis and single-crystal X-ray structure determination of the title compound (phen)Pb(02CMe) is described. The complex crystallizes in the monoclinic space group P2 /c, a = 7.823(3), b = 12.421(4), c = 9.262(2) ?, ? = 79.92(3)", Z = 4, yielding R 0.048 for 3210 independent reflections. The coordination number around the lead atom is six. [Pb-N 2.54(2), 2.56(4)],[Pb-0, 2.19-2.22] https://jsciences.ut.ac.ir/article_31103_cef65a145c54dbe0f1ea8ad16a331421.pdf