University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
ANTIAMOEBIC ACTIVITY OF RIND AND
FLOWERS OF PUNICA GRANATUM LINN

31153
EN
Journal Article
1970
01
01
The antiamoebic activity of water soluble fractions of the rind and flowers of
Punicu grunutum has been assessed. The in vitro and in vivo studies, carried out on
a virulent strain of Entamoebu histotyticu, exhibited encouraging results
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
MOLECULAR ANALYSIS OF THE SULFUR
REGULATORY CIRCUIT OF NEUROSPORA
CRASSA

31154
EN
Journal Article
1970
01
01
The sulfur regulatory circuit of the filamentous fungus, Neurospora crassa,
consists of a set of unlinked structural genes which encode sulfur catabolic and two
major regulatory genes which govern their expression. The cys3 regulatory gene
encode a transacting regulatory protein which activates the expression of cys14 and
ars, whereas the other regulatory genes Sconl and Scon2 appear to act in a
negative fashion
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
EFFICIENT PHOSPHOROUSSULFUR
BOND REDUCTION IN BICYCLIC
THIAPHOSPHORANES WITH
TRInBUTYLTIN HYDRIDE

31155
EN
Journal Article
1970
01
01
High yield photolytic reduction of a series of thiaphosphoranes Z p SR to give Z p H
with UVlightinduced trinbutyltin hydride through phosphoranyl radical Z p is
described. This reaction is inhibited by amethylstyrene and initiated by a radical
initiator such as azobisisobutyronitrile
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
REACTION OF 4METHYL 1 2,4TRIAZOLINE
3,5DIONE
WITH
DI AND TRISUBSTITUTED STYRENES
S.E. Mallakpour* and G.B. Butler**

31156
EN
Journal Article
1970
01
01
2,4,6Triisopropylstryrene was synthesized in a single step via the Witting
Reaction from the corresponding aldehyde. The reaction of three styrene's
derivatives, 2,6dimethylstyrene, 2,4,6trimethylstyrene, and 2,4,6
triisopropylstyrene with 4methyll,2,4triazoline3,5dion(M eTD) was
investigated. These reactions are instantaneous at room temperature and lead to the
formation of 2: 1 adducts in high yield via double DielsAlder reactions. In each case
the initially formed 1:l DielsAlder adduct is extremely reactive, and was not
isolated. It readily undergoes the second Diels Alder reaction with MeTD. These
2:l adducts wete fully characterized by IR, CNMR(o ff resonace, INEPT,
multiplicity determination sequence techniques), mass spectra, 'HNMR and
elemental analysis.
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
EFFECT OF THE NEXTNEAREST NEIGHBOR
INTERACTION ON THE ORDERDISORDER
PHASE TRANSITION

31157
EN
Journal Article
1970
01
01
In this work, one and twodimensional lattices are studied theoretically by a
statistical mechanical approach. The nearest and nextnearest neighbor interactions
are both taken into account, and the approximate thermodynamic properties of the
lattices are calculated. The results of our calculations show that: (1) even though the
nextnearest neighbor interaction may have an insignificant effect on the entropy of
either the almost purely ordered or disordered phase, it does have a significant effect
on the entropy of the lattice when the orderdisorder transition is taking place. (2) The
nextnearest neighbor interaction broadens the range of temperature on which the
transition occurs. (3) The transition takes place more slowly with respect to temperature,
when the nextnearest neighbor interaction is considered.(4) The average
temperature, at which the transition occurs, shifts to a higher one when there is an
increase in the nextnearest neighbor interaction
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
PALYNOLOGICAL STUDY OF PALEOZOIC
SEDIMENTS OF THE CHALISHEH AREA,
SOUTHWESTERN IRAN

31158
EN
Journal Article
1970
01
01
The Paleozoic sediments of the ChaliSheh area in southwestern Iran comprising
of Mila Formation, Ilebek Formation and Faraghan Formation, were studied
palynologically. The samples containing wellpreserved palynomorphs include
acritarchs, chitinozoans, scolecodonts and pollenlspores. A palynological zonation
has been established and comparison was made with other parts of the world. Based
on stratigraphic potential of the diagnostic taxa, the Mila Formation is uppermost
Cambrian to lowermost Tremadocian, Ilebek'Formation Tremadocian and the
Faraghan Formation is Lower Permian. Therefore, there is a hiatus within the
Paleozoic sequence of the ChaliSheh area extending from Upper Ordovician into
the Lower Permian. This hiatus possibly coincides with Hercynian Orogeny which
resulted in the emergence of the Zagros Basin and produced extensive erosion.
Comparing palynomorphs of the Paleozoic sediments of ChaliSheh with published
palynological data, reveals that the Zagros Basin has been part of the "Mediterranean
Acritarch Province" during the Lower Ordovician. The presence of gondwanic
palynomorphs within the Faraghan Formation suggests a gondwanic relationship in
the Permian period.
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
FIRST REPORT ON PLATINUMGROUP
MINERALS IN CHROMITITES J%OM
NORTHWESTERN NEYRIZ OPHIOLITE, IRAN

31159
EN
Journal Article
1970
01
01
Electronprobe microanalyses and scanning electron microscopy of chrornitites
from some ultramafic members of Neyriz ophiolite indicate that sulifides of platinum
group minerals (PGMs) occur as solid inclusions in chromite grains. Laurite
with the general formula of (Ru ,Os ,lr ) S , and erlichmanite are the main
identified sulfide phases. The PGMs occur as 4 to 20 microns euhedral to rectangular
inclusions, and seem to be confined to massive chrornitite deposits. The PGMs do not
seem to have exsolved from chromite, it is believed that their crystallization has taken
place prior and/or during the crystallization of this mineral. Some secondary minerals
of rare earth elements (REEs) were also found to fill the micro cracks and fractures
in chromite grains. Semiquantitative analyses reveal the presence of appreciable
amounts of Ce and La along with some minor quantities of Gd, Eu, Pr, and Nd. These
secondary minerals are extremely small and none were found to be larger then 10
microns in diameter. Some base metal alloys (largely made of NiFe), along with
magnetite, ferritechromite, and some olivine and pyroxene silicate inclusions are also
reported.
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
ON THE STRUCTURE OF FINITE
PSEUDO COMPLEMENTS OF
QUADRILATERALS AND THEIR
EMBEDDABILITY

31160
EN
Journal Article
1970
01
01
A pseudocomplement of a quadrilateral D of order n, n, > 3, is a nontrivial (n+l)
regular linear space with n  3n + 3 points and n + n  3 lines. We prove that if n > 18
and D has at least one line of size n  1, or if n > 25 , then the set of lines of D consists of
three lines of size n 1, 6(n  2) lines of size n  2, and n  5n + 6 lines of size n  3.
Furthermore, if n > 21 and D has at least one line of size n  1, then D is embeddable in a
unique projective plane of order n. These results improve the results of the author
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
BIFURCATION OF PERIODIC SOLUTION
FROM AN EQUILIBRIUM POINT IN THE
MULTIPARAMETER CASE

31161
EN
Journal Article
1970
01
01
We consider the bifurcation of periodic solutions from an equilibrium point of the
given equation: x =F(x,?) , where x ? R , ? is a vector of real parameters
? , ? , ... , ? and F:R x R >R has at least second continuous derivations in variables
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
A LOW TEMPERATURE SPECIFIC HEAT
INVESTIGATION OF Cd Mn Se AND Cd Mn S

31162
EN
Journal Article
1970
01
01
The specific heat of Cd Mn Se (x = 0.01) and Cd , Mn S (x = 0.026) in the
temperature range of 0.3  40K was measured. The measurements were carried out in
different applied magnetic fields (H = 0,10,20, 28KG). The results were analyzed
with a model which includes long range interactions. Calculations based on on
extended version of nearest neighbor pair approximation (including triplets) yielded
a reasonable agreement with the experimental results. This approximation is seen to
provide a good simultaneous description of the specific heat, susceptibility and
magnetization results.
University of Tehran
Journal of Sciences, Islamic Republic of Iran
10161104
4
1
1993
03
01
DYE JET VELOCITY DISTRIBUTION
MEASUREMENTS USING PHOTOTHERMAL
DEFLECTION SPECTROSCOPY

31163
EN
Journal Article
1970
01
01
We demonstrate that photothermal deflection spectroscopy can be used to measure
velocity distributions in dye jets. Such measurements are useful in determining the
quality of flow in dye jets, The quality of jets is very important for a stable and naanow
linewidth operation of dye lasers