University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 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 - 31260 EN Journal Article 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_08115ea8e8a940675023870ddead8842.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 MICROBIAL CHAIN DEGRADATION OF CHOLESTEROL BY ARTHROB ACTER SIMPLEX - 31261 EN Journal Article 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_5d5ef971a832156872b8ae6732280d0a.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 DNA REPLICATION AND SYNTHESIS OF DNABINDING PROTEINS IN THE CHLOROPLASTS OF A CALLUS CULTURE - 31262 EN Journal Article 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_face3ee8cd23d4e678783e668802b7a6.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 SPECTROPHOTOMETRIC REACTION RATE METHOD FOR THE DETERMINATION OF NITRITE BY CATALYTIC ACTION ON NILE BLUE A BROMATE REACTION - 31263 EN Journal Article 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_b884881fa38175c803d9084ac18e39b9.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 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) - 31264 EN Journal Article 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_56909640f93a509bda9494a0178e091e.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 NITROIMIDAZOLES XI1 [I]: SYNTHESES OF TRISUBSTITUTED PYRAZOLES AND SUBSTITUTED (1 -METHYL-5-NITRO-2- IMIDAZOLYL) PYRIMIDINONES - 31265 EN Journal Article 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_fa68a633df6169bb2bf730da98faff59.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 ANALYSIS OF DEXAMETHASONE SODIUM PHOSPHATE INJECTION AND OPHTHALMIC SOLUTION BY HPLC, KINETIC INTERPRETATION AND DETERMINATION OF SHELF LIFE - 31266 EN Journal Article 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_5909e98016c8d94baefc6def4f5b785e.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 THE FRANK KINETIC MODEL FOR SPONTANEOUS CHIRAL SYMMETRY BREAKING WITH VARIABLE CONCENTRATION OF THE ACHIRAL SUBSTRATE - 31267 EN Journal Article 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_8cb984778464a4dabc3bdccdb3c60bde.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 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 - 31268 EN Journal Article 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_5a3f14123cb2123e5a861d42dfa7e14c.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 POTASSIUM-ARGON ANALYSIS OF DOMAL SALT BY STEPWISE DISSOLUTION - 31269 EN Journal Article 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_7318eebbea30cea9561c1edfbf3a3451.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 AN INVERSE PROBLEM WITH UNKNOWN RADIATION TERM - 31270 EN Journal Article 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_f8b9c9905a91ffd593f4ddc8293eb900.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 INCLUSION RELATIONS CONCERNING WEAKLY ALMOST PERIODIC FUNCTIONS AND FUNCTIONS VANISHING AT INFINITY - 31271 EN Journal Article 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_0ab605102670807b661d9a1a4e618745.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 4 1995 12 01 EXPERIMENTAL INVESTIGATION OF THE POPULATION DENSITIES OF LOWEREXCITED STATES OF NEON - 31272 EN Journal Article 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_dafe0a22bfe43bc5f925ad398d6f90c2.pdf