University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
LIFE HISTORY, BEHAVIOR AND MORPHOLOGY
OF THE IMMATURE STAGES OF ENOCHRUS
QUADRIPUNCTATUS HERBST
IN THE LABORATORY
(COLEOPTERA: HY DROPHILIDAE)
11- MORPHOLOGY
EN
The life history, behavior and morphology of the immature stages of Enochrus
quadripunctatus Herbst from Iran are studied. The results of the work on the life
history and behavior of this species in the immature stages and as newly-emerged
adults have been presented as part I. The morphology of the egg cases, larvae, pupae,
and the male genitalia of the adult is covered in the present work. Measurements of
the egg cases, larvae, pupae and adults are made and the average ratio of growth in
the larval stages given
https://jsciences.ut.ac.ir/article_31260.html
https://jsciences.ut.ac.ir/article_31260_0c89fda45ea2caa549928f2bceb284ec.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
MICROBIAL CHAIN DEGRADATION OF
CHOLESTEROL BY ARTHROB ACTER SIMPLEX
EN
Because of the importance of microbial metabolites of cholesterol as precursors in
the synthesis of steroidal drugs, we decided to study the ability of Arthrobacter
simplex to degrade cholesterol. Arthrobacter simplex cleaves the side chain of
cholesterol in the presence of 2,2'-dipyridyl and produces 4-androstene-3,17- dione
(AD) and androsta- 1,4-diene-3,17-dione(ADD). Two other intermediates with intact
side chain, 4-cholestene-3-one and cholesta- l,4-diene-3-one were also detected and
purified in the culture of A. simplex
https://jsciences.ut.ac.ir/article_31261.html
https://jsciences.ut.ac.ir/article_31261_1b173b2863b3da934c1abe24d56a3e65.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
DNA REPLICATION AND SYNTHESIS OF DNABINDING
PROTEINS IN THE CHLOROPLASTS
OF A CALLUS CULTURE
EN
Continuous labelling of callus with H-thymidine results in intermittent peaks of
H-DNA per chloroplast, showing synchrony of division. The increase in H-DNA
could be due to several replication rounds, and the drop to successive plastid divisions
without intervening DNA synthesis. The level of DNA-binding proteins in the
chloroplast parallels the peaks of plastidal DNA synthesis; such proteins could hence
comprise factors necessary for plastid multiplication in tissue cultures
https://jsciences.ut.ac.ir/article_31262.html
https://jsciences.ut.ac.ir/article_31262_0f70af86f6db57150e2ddf30c2463857.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
SPECTROPHOTOMETRIC REACTION RATE
METHOD FOR THE DETERMINATION OF
NITRITE BY CATALYTIC ACTION ON NILE
BLUE A BROMATE REACTION
EN
A kinetic method developed for the determination of ultra-trace amounts of nitrite
based on its catalytic effect on the reaction between potassium bromate and Nile blue
A in strongly acidic media is reported. The reaction was monitored
spectrophotometrically by measuring the decrease in absorbance of Nile blue A at 645
nm by the fixed-time method. The decrease in absorbance during the first 0.5-3.0 min
of the reaction is related to the concentration of nitrite in the range of 0.002-0.500
µg.ml . The detection limit of 0.001 µg.ml was achieved for the nitrite ion. The
relative standard deviation for 0.0100 µg.ml nitrite is 1.0%. Most common anions
and cations did not interfere in the measurement. The procedure was successfully
applied for the determination of nitrite in natural water and salt
https://jsciences.ut.ac.ir/article_31263.html
https://jsciences.ut.ac.ir/article_31263_aed05441ebdb9bfae7aced5f4615c799.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
LEWIS BASE ADDUCTS OF LEAD(I1)
COMPOUNDS IV*,
SYNTHESIS AND CRYSTAL STRUCTURES OF
(DINITRATO) (1,4,8,11- TETRA- AZAANDECANE)
LEAD(I1)
EN
The synthesis and single-crystal X-ray structure determination of the title compound (dinitrato) (1,4,8,11 -tetra-azaandecane) lead(II) is described. Crystals are monoclinic, P2 /ca= 10.271 (2)?,b= 13.524(4) ?,c= 11.298(6) ?,?=94.68(3),2=4,R,Rw, 0.036 and 0.041, respectively. The lead atom is eight-coordinate [Pb-N, 2.44 (2) - 2.55 (1)], [Pb-0,2.87 (1) - 3.06 (2)].
https://jsciences.ut.ac.ir/article_31264.html
https://jsciences.ut.ac.ir/article_31264_26ee9b213f3aebecf50e074d3b089693.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
NITROIMIDAZOLES XI1 [I]: SYNTHESES OF
TRISUBSTITUTED PYRAZOLES AND
SUBSTITUTED (1 -METHYL-5-NITRO-2-
IMIDAZOLYL) PYRIMIDINONES
EN
The reaction of P-diketones 1 with phenyl hydrazine afforded 5-aryl-3-(1-
methyl-5-nitro-2-imidazoly1)-1-phenylpyrazole (2) and 3-aryl-5-(1-methyl-5-
nitro-2-imidazoly1) -1-phenylpyrazole (3). The reaction of diketones (1) with
urea in the presence of p-toluenesulfonic acid gave 4-(or 6-)aryl-6-(or 4-)(1-methyl-
5-nitro-2-imidazolyl)-1-(lH)pyrimidones (4). The structures of all
compounds were confirmed by spectroscopic methods
https://jsciences.ut.ac.ir/article_31265.html
https://jsciences.ut.ac.ir/article_31265_9fa68c914faf214e6c203698e92528de.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
ANALYSIS OF DEXAMETHASONE SODIUM
PHOSPHATE INJECTION AND OPHTHALMIC
SOLUTION BY HPLC, KINETIC
INTERPRETATION AND DETERMINATION OF
SHELF LIFE
EN
The use of accelerated temperature stability studies using the Arrhenius
relationship is routine for estimating the stability of a drug at room temperature.
Therefore, the acceleration method is used to determine the expiration date of
dexamethasone aqueous formulation manufactured in Iran. A high-performance
liquid chromatography (HPLC) method utilizing ultraviolet (UV) detection for
dexamethasone disodium phosphate and ophthalmic solution is described.
Using the kinetic information generated from the high-temperature studies, at
60,70, 80 and 90°C, an Arrhenius plot for dexamethasone disodium phosphate
degradation was constructed and the shelf-life of the drug was estimated
https://jsciences.ut.ac.ir/article_31266.html
https://jsciences.ut.ac.ir/article_31266_15cc30978f2e95288697d75eb7ffc03a.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
THE FRANK KINETIC MODEL FOR
SPONTANEOUS CHIRAL SYMMETRY
BREAKING WITH VARIABLE CONCENTRATION
OF THE ACHIRAL SUBSTRATE
EN
This paper considers the possibility of spontaneous transition of aracemic mixture
(composed of equal amounts of two enantiomeric species, say L and D) into a
monochiral state (in which only one enantiomer, say L, is present). Transitions of this
kind have been recently experimentally observed. A plausible approach to this
phenomenon is a model put forward by Frank, based on simple laws of chemical
kinetics. In order to be able to solve the underlying system of differential equations,
Frank made a drastic assumption, namely that the amount of achiral substrate from
which the enantiomers L and D are formed is time-independent. In this paper, it is
demonstrated that such an assumption is not justified, but that the essential features
of the Frank model are also maintained if the amount of the achiral substrate is allowed
to be time-dependent
https://jsciences.ut.ac.ir/article_31267.html
https://jsciences.ut.ac.ir/article_31267_421845c0c0246ee778c775f18d51e185.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
ON THE SPECTRAL BEHAVIOR-OF DEUTERIO
ANALOGUES OF SOME CAFtBOXYLIC ACIDS
IN HEAVY WATER AND CORRELATION
BETWEEN THEIR CARBONYL STRETCHING
FREQUENCIES AND THEIR ACIDIC
STRENGTHS AT INFINITE DILUTION
EN
Infrared spectra of some deuterio analogues of carboxylic acids in heavy
water have been investigated and their spectral behavior in carbonyl stretching
frequency region have been interpreted in terms of their structural behavior in
aqueous solutions. It has been shown that a linear relationship exists between
carbonyl stretching frequency of solvated acids at infinite dilution and their
pK s .
https://jsciences.ut.ac.ir/article_31268.html
https://jsciences.ut.ac.ir/article_31268_18051cfa786a2c3c23aca8a2ab670163.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
POTASSIUM-ARGON ANALYSIS OF DOMAL
SALT BY STEPWISE DISSOLUTION
EN
Potassium-argon analysis by stqwise dissolution provides a way to measure in
detail the distribution of argon isotopes and potassium in rock salt. The method can
be used for salt that contains only trace amounts of potassium, because the potassium
and argon in detrital silicates within the salt are not released during the dissolution.
Water may be used as the solvent when relatively large amounts (one gram or more)
of salt are to be dissolved in each step of the analysis. Methanol may be used when
relatively small amounts of salt are to be dissolved in each step, in order to obtain high
spatial resolution of the distribution of potassium and argon in the salt. Although
preliminary analyses show that potassium-argon relationships in the deformed salt of
salt domes can be very complex, analysis of these relationships by stepwise dissolution
of properly chosen samples should provide useful isotope correlations in cases where
the amounts of atmospheric argon and radiogenic argon in the salt are comparable
https://jsciences.ut.ac.ir/article_31269.html
https://jsciences.ut.ac.ir/article_31269_4f34ae16847df0c793e33b0a10776562.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
AN INVERSE PROBLEM WITH UNKNOWN
RADIATION TERM
EN
In this paper, we consider an inverse problem of linear heat equation with
nonlinear boundary condition. We identify the temperature and the unknown
radiation tern from an overspecified condition on the boundary
https://jsciences.ut.ac.ir/article_31270.html
https://jsciences.ut.ac.ir/article_31270_18098e67c2431825c2b8ecc7b75f58f2.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
INCLUSION RELATIONS CONCERNING
WEAKLY ALMOST PERIODIC FUNCTIONS
AND FUNCTIONS VANISHING AT INFINITY
EN
We consider the space of weakly almost periodic functions on a
transformation semigroup (S, X , ?) and show that if X is a locally compact
noncompact uniform space, and ? is a separately continuous, separately proper,
and equicontinuous action of S on X, then every continuous function on X,
vanishing at infinity is weakly almost periodic. We also use a number of
diverse examples to show that the conditions we have imposed on the
transformation semigroup are almost essential for the inclusion to hold
https://jsciences.ut.ac.ir/article_31271.html
https://jsciences.ut.ac.ir/article_31271_c4cabc4a812dd80b527cbae4f3c88738.pdf
University of Tehran
Journal of Sciences, Islamic Republic of Iran
1016-1104
2345-6914
6
4
1995
12
01
EXPERIMENTAL INVESTIGATION OF THE
POPULATION DENSITIES OF LOWEREXCITED
STATES OF NEON
EN
Many studies employing various methods have been carried out into the number
densities of excited atoms in electrical discharges with inert gases [1,2,3], but the
ranges of the discharge current and gas pressure is very limited in them all. In this
work, the population densities of 3S, 3s' of neon have been investigated using the
atomic absorption method. Since the discharge current and gas pressure have marked
effects on the variation of these densities, the pressure range of 0.1-15 m. bar and
currents up to 30 mA have been used
https://jsciences.ut.ac.ir/article_31272.html
https://jsciences.ut.ac.ir/article_31272_47309f2a596dc2f8ac845c01947573bd.pdf