University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
IN VITRO REGENERATION OF SHOOT AND
CORM FROM THE DIF'FERENT EXPLANTS OF
CROCUS SATWUS L
-
31104
EN
Journal Article
1970
01
01
Different explants of Crocus sativus L. such as corm, style, ovary, petal, anther and
leaf were cultured on LS and MS media supplemented with NAA and BAP or 2,4-D
plus BAP at different combinations. Shoot and corm induction occurred in addition
to the formation of other organs. Efficient plantlet regeneration with strong roots
occurred at 1 mg 1-I of both NAA and BAP. An increase in 2,4-D level enhanced callus
formation, but suppressed shoot bud generation. Shoot and corni regeneration was
observed on other explants in addition to corms
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
THE DESIGN, MODELING AND EVALUATION
OF POTENTIAL HIV PROTEASE INHIBITORS
USING BLITZ, AN INTERACTIVE COMPUTER
GRAPHICS WORKING TOOL
-
31105
EN
Journal Article
1970
01
01
Several nonpeptide small molecules were designed as potential inhibitors of
HIV protease and their structures were constructed by computer-aided
molecular modeling and docked iwo the active site of HIV protease. Models of
the complexes of inhibitors and the HIV protease were refined using nonbonded
and H-bonding terms. The refined energy of selected complexes
showed that the designed inhibitors fitted tightly into the active site of receptor
cavity. The structure of the designed inhibitor (HI-082) was superimposed on
the molecule of haloperidol (which has been reported to have anti-HIV protease
activity) and it was found that they share a number of common structural
features. These results showed that these small nonpeptide molecules interact
strongly with the HIV protease and may therefore inhibit its action in which
case they would be potential anti-AIDS agents
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
LEWIS-BASE ADDUCTS OF LEAD(II)
COMPOUNDS V,*
SYNTHESIS AND STRUCTmAL
CHARACTEREATION OF MONONUCLEAR
(ACETATO-0,O') BIS(2,Zr-BIPYRIDINE)
(PERCHLORATO-0,O') LEAD(II) AND
BIS (2,Z'-BIPYRIDIW) BIS(PERCHL0RATO-0,O') LEAD(II)
-
31106
EN
Journal Article
1970
01
01
The synthesis and single-crystal X-ray structure determination of the title compound [(bipy) , Pb(0 ,CMe) (O ClO )] (1) and [(bipy) Pb(ClO ) ] (2) is described.
Compound (I) crystallizes in the triclinic space group P1(2), a= 7.384(2), b=
12.824(3), c= 10.622(6) A, ?= 73.41(2), ?= 80.98(2), ?= 73.68(2)', Z= 2, and R =0.033 for 3408 independent reflections .Compound (2) crystallizes in the monoclinic space group P2 /n(14), a= 6.883(5), b= 13.010(4), c= 10.710(5)?,?= 91.26(2)? Z=2, and R= 0.048 for 3290 independent reflections
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
" BISCYCLISATION" SYNTHESIS OF 1,8-DIHYDROXY-9, 1 0- ANTHRAQUINONE (1,8-DHA)
-
31107
EN
Journal Article
1970
01
01
The synthetic route in this work is based on the classical Friedel-Crafts strategy,
and began with 1,4-dimethoxybenzene (I), followed by alkylation and selective
demethylation of 2-methoxy function in 0x0-acid (3). The orthoformylation to
synthesize aldehyde (6) was based on the Reimer-Tieman reaction. Chain extension
of this aldehyde required methylation of the hydroxyl group and condensation with
pyruvic acid which afforded acid (8) in 85% yield. Two steps reduction process of this
acid led to diacid (1 1) in good yield. A direct "biscylisation" of (1 1) afforded diketone
(12) as the main product. This compound was converted to (1,8-DHA), 15, via an
aromatization process
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
ONE-DIMENSIONAL TREATMENT OF
HYDROGEN BOND PART1
THE CASE OF THE LINEAR HYDROGENBOND
-
31108
EN
Journal Article
1970
01
01
The one-dimensional model of Lippincott and Schroeder for hydrogen bond has
Been re-examined and it has been shown that O-H bond distance depends on repulsive van der Waals and attractive electrostatic potentials.it has been shown that constant b in the van der Waals repulsion potential is not transferable to all hydrogen bonds.
The possibility of obtaining the semi-empircal parameters in the Lippincott and
Schroeder potential function from OH Stretchihg frequeficies , hydrogen bond energy and geometrical parameters has been discussed
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
BIOSTRATIGRAPHY OF THE ASMARI
FORMATION, BURUJEN AREA, IRAN
-
31109
EN
Journal Article
1970
01
01
Lithological characteristics of the Asmari Formation in the Burujen area are:
pelagic foraminifera wackestone-packstone; bentic foraminifera echinid packstone;
bentic foraminifera corallinaceapackstone; coral boundstone and echinid corallinacea
packstone to grainstone; corallinacea boundstone; corallinacea bryozoa packstone;
rniliolid echinid wackestone; and bioclastic wackestone. The examined outcrops at
the Buldaji, Chaghakhor, and Tang-e Kloreh locations are Upper Oligocene, Lower
Miocene (Aquitanian) and Lower Miocene (Burdigalian) in age, respectively. Age
was determined by the occurrence of Lepidocyclina (Eu1epidina)-Lepidocyclina (Nephro1epidina)-Nummulites,M iogypsina-Lepidocyclina and Neoalveolina melo Group assemblage zones. Consequently, the outcrops at the Buldaji, Chaghakhor and Tang-e Kloreh locations are synonymous to lower, middle and upper Asmari Formation.
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
AN AMALGAMATED METHOD FOR
ESTIMATING AGE-RELATED CENTILES
-
31110
EN
Journal Article
1970
01
01
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
7
1
1996
03
01
HIGH PRESSURE BEHAVIOR OF KCl:
STRUCTURAL AND ELECTRONIC
PROPERTIES
-
31111
EN
Journal Article
1970
01
01
The high pressure behavior of the structural and electronic properties of KC1 is studied
with use of the density functional pseudopotential method within local-density
approximation. Atzero pressure, the rocksalt phase is found to be lower in energy than CsCl
structure. However, we predict a phase transition into CsCI structure at a pressure of about
1.5 GPa. The calculated ground state properties such as lattice constant, bulk modulus, and
its pressure derivative are in reasonable agreement with experiment. The electronic band
structure at normal and high pressures is also calculated. It is found that metallization occurs
for rocksalt and CsCI structures at ultrahigh pressures