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
1970
01
01
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_9cf02e2c07d811c85bbac94cf550c0d3.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
1970
01
01
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_d67e0db85f6924b501d6b1f5bd7a9a93.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
1970
01
01
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_8395b53bded722021abf80cad2cd9ed9.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
1970
01
01
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_6b66878a837cf18fdc0774ca9d0a7c7e.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
1970
01
01
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_ccf79f8d7c0d48606bde80cd9eb65bec.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
1970
01
01
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_9730ad008a91bb00b5f0b29e184fa919.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
1970
01
01
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_c041bd4e569f6c40464b6e81dbec7ef6.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
1970
01
01
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_8dc0dcbdbc81b1878f22bd2b1e3dc6d7.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
1970
01
01
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_5a9e9fd2355d0fc06ee5356415ffbd3b.pdf