University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 STUDY OF CHRQMOSOMES AND SOLUBLE PROTEINS OF RHMYA STRICTA DECASINE. AND NERIUM OLEANDER L. - 31125 EN Journal Article Electrophoresis of proteins, especially seed proteins, and karyological studies are useful techniques for determining species and solving the problems of modern taxonomy. The present study was carried out on two species of the Apocynaceae family, Rhazya stricta Decasine and Nerium 01eancder.L. Seed samples of these two genera were taken from the south-east of Iran and SDS-PAGE analysis of their proteins showed 35-88% and 40-80% similarities between different populations of each species respectively. In the protein groups from a selected population of each one of these two species and Vinca rosea L., another species of the Apocynaceae family, 47-55% similarity was observed. However, for identification of these genera, the possession of 2-5 protein groups which were present in excessive quantities could be used. Studies on mitotic and meiotic chromosomes in the various populations of Rhazya and Nerium showed that the basic chromosome number in both species was 1 1, (2n= 2x=22) but the small size of the chromosomes madekaryotyping problematic. In spite of this difficulty, the relatively larger chromosomes of one of the Nertum populations were prepared. https://jsciences.ut.ac.ir/article_31125_535a60b1776bb47cc3b55a73fc486c54.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 IDENTIFICATION OF A MYCOBACTERIUM AND A BREVIBACTERIUM PRODUCING ANTIBACTERIAL SUBSTANCES - 31126 EN Journal Article Two strains, HG104 and ASSO, were isolated Crom the soil of Tehran's suburbs. Taxonomic studies showed thatHG104 and AS50 belong to Mycobacterium spp. and Brevibacterium spp. respectively, which produce antibacterial substances with relatively high activity against some important clinical Gram-positive and Gramnegative bacteria https://jsciences.ut.ac.ir/article_31126_bfcefed6ef9db2e3453b7aad610c6515.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 INTERACTION OF DNA WITH THE FOLDED AND UNFOLDED HISTONE HI IN THE PRESENCE OF SURFACE ACTIVE AGENTS - 31127 EN Journal Article Interaction between DNA and histone H, was investigated in the presence and absence of sodium-n-dodecyl sulphate (SDS) and dodecyl trimethylammonium bromide (DTAB) at temperatures of 27 and 37?C, in 2.5 mM phosphate buffer, pH 6.4 by UV spectrophotometry, equilibriumdialysis and titration. The presence of 1.33 mM SDS caused histone H to fold and to further contact DNA. Binding data were used in the Wyman theoretical model to calculate the free energy and enthalpy of the interaction and were compared with equilibrium state. All data confirm the higher compaction for DNA in the presence of folded histone H (H in the presence of 1.33 mM SDS) relative to native histone H (H in the absence of SDS) https://jsciences.ut.ac.ir/article_31127_88f9344f9167663504c5cc3a143a9b89.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 A REVISION OF THE TRIBE AELIINI (HEMIPTERA: PENTATOMIDAE: PENTATOMINAE) FROM THE INDO-PAKISTAN REGION - 31128 EN Journal Article Five genera and ten species of the tribe Aeliini Still from the Indo-Pakistan region are keyed, compared to their closest allies and their geographical distribution given. A description of all the above genera and species of Adria St?l and Bonacialus Distant has been given. These species, including two new species of Adria, are described with special reference to their metathoracic scent gland complex and male and female genitalia https://jsciences.ut.ac.ir/article_31128_e348c1b446fae14bfcf5ae20ee4c23f0.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 A NOVEL AND HIGHLY SENSITIVE CATALYTIC METHOD FOR THE DETERMINATION OF ULTRA TRACE AMOUNTS OF CERIUM WITH SPECTROPHOTOMETRIC DETECTION - 31129 EN Journal Article Cerium (IV) has a catalytic effect on the very slow redox reaction between gallocyanine and bromate in acidic media. The reaction was monitored spectrophotometrically at 525 nm by a fixed time method of 4.0 rnin from initiation of the reaction. The decrease in absorbance at 525 nm is proportional to the Ce (IV) concentration in the range of 0.005-1.000 and 1.00-10.00 pg. ml-l. The limit of detection is 2.0 ng.ml-'. The relative standard deviation for ten replicate analyses of 0.100 pg.ml-' is 1.5%. The method is used for the determination of cerium in synthetic and in real samples, with good accuracy. The effect of interfering cations and anions was also studied. https://jsciences.ut.ac.ir/article_31129_7d7da6daaf3732a05b10cd8b625c81fd.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY WITH MAlIlRIX MODIFICATION FOR DETERMINATION OF LEAD IN DRINKING WATER - 31130 EN Journal Article An amoniumvanadate plus sodium molybdate mixed modifier Graphite Furnace Atomic Absorption Spectrometric method has been developed for determination of traces of lead in drinking water. The concentration of lead in the sample is obtained by direct comparison to linear working graph prepared from aqueous standards in the modifier medium, The results indicate the better performance of the proposed modifier over Pd-Mg. Recovery of lead from spiked samples was 99.4%. The withinrun and within-batch precisions, RSD, were less than 4%. The limit of detection based on three times the standard deviation of the blank was 0.07 µg I . The sensitivity and siihplicity of the method make it attractive for routine determination of lead in environmental samples. https://jsciences.ut.ac.ir/article_31130_319b4401f81f42d06aec44e1fd6edd9a.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 RATE CONSTANTS FUR THE ELECTRODE REACTIONS OF QUINONES IN CHLOROFORM: THE DEPENDENCE ON ELECTRODE MAmRIAL,S AND APPARENT STANDARD POENTIALS - 31131 EN Journal Article The reduction process for some quinones has been studid by cyclic voltammeby, rotating disk electrode voltammetry and chronopotentiometry in chloroform at platinum, gold and glassy carbon electrodes using tetrabutylmonium perchlorate (TB AP) as supporting eiectrolyte. The results obtained from this study reveal that the reduction of the quinones is two one-electron processes, the first reduction to the serniquinone anion radical is nearly reversible and the second to the dianion is quasireversib'te. The Gnetic parameters for the reduction of the quinones to the semiquinone were evaluated and the dependence on the electrode marerials and apparent standard potentiai is discussed. The diffusion coefficients of the quinones were determined from both chronopotentiometric and chronoamperomeMc measwements in 0.5 M chloroform solution of TBAP https://jsciences.ut.ac.ir/article_31131_e06e5fef737c2b369a295d2b22fa1b1f.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 SYNTHESIS AND CRYSTAL STRUCTURE OF [PPh ] [WOS (CUNCS) ] - 31132 EN Journal Article The reaction of [PPhJ, NOS,] with CuCl and KSCN (1 :3:3) in acetone produces the yell-ow crystals of [PPh,], [WOS,(CuNCS),]. The crystals are triclinic, space group P1(2), z=2, a=12.4823(7), b=12.9224(7), c=18.6395(10)?, ?=83.907(5), ?= 73.152(4), Y= 65.194(4)'. The crystal structure was determined by single crystal Xray diffraction methods (Mo-K ?) and refined by least-squares calculations to a final R-value of 0.062 (R = 0.081) for 1851 unique observed reflections [F>3?|F|]. In [WOS (CuNCS) ] anion the tungsten and copper atoms have essentially a tetrahedral and trigonal planar co-ordination geometry respectively https://jsciences.ut.ac.ir/article_31132_77a8a15e83db795ece719efa7ce127da.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 STUDIES OF TRANSITION METAL COMPLEXES WITH 2N-QUINOLYL- AND 2N-ISOQUINOLYL- 1,1,3,3-TETRAMETHY LGUANIDINES - 31133 EN Journal Article Ligands derived from 8-quinoline, 6-quinoline, 1 -isoquinoline, and 5-isoquinoline were synthesized. These compounds have been used as ligands for complexation of transition metals, such as copper(II) and nickel(II). According to the spectrosocopic data, copper(II) cation forms (I: 1) and (I:2) complexes with 2-(8-quinoly1)-l,l,3,3- tetramethylguanidine and 2- (I '-isoquinoly1)- 1,1,3,3-tetramethylguanidine, respectively. In contrast, 2-(6'-quinoly1)- 1, l,3,3-tetramethylguanidine and 2-(5'-isoquinoly1)- 1,1,3,3-tetramethylguanidine ligands were shown only in (1: 1) metal-ligand complex. When these ligands are reacted with nickel(II), the same results are obtained. https://jsciences.ut.ac.ir/article_31133_795a87ea31ee42f7f0cdaff766a58238.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 CLEAVAGE OF ESTERS AND ETHERS WITH SILICA CHLORIDE - 31134 EN Journal Article Silica chloride converted benzyl or tert-butyl esters to the corresponding acid chlorides and alkyl chlorides. It also converted benzyl or tert-butyl phenyl ethers to the corresponding allcyl chlorides and phenol https://jsciences.ut.ac.ir/article_31134_5db16d02db25b9673ff2f72440366df0.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 ALKALOIDS OF PAPAVERACEAE (XIII).' ALKALOIDS OF PAPAVER F UGAX POPULATION KHALKHAL AND PAPAVER CA UCASICUM POPULATION ELIKA - 31135 EN Journal Article Papaver fugax Poiret population Khalkhal was shown to contain four major alkaloids, roemerine (0.19%), mecamberine (0.39%), liriodenine (0.20%) and salutaridine (0.10%). Papaver caucasicum M. B. population Elika was shown to contain four major alkaloids, nuciferine (0.50%), amurensinine (0.15%), lysicamine (0.30%) and nornuciferine (0.40%). Lysicarnine and nornuciferine were detected for the first time in Papaveraceae https://jsciences.ut.ac.ir/article_31135_c358fd9b46b9fddccddd7a427e522f9b.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 ON THE POWER FUNCTION OF THE LRT AGAINST ONE-SIDED AND TWO-SIDED ALTERNATIVES IN BIVARIATE NORMAL DISTRIBUTION - 31136 EN Journal Article This paper addresses the problem of testing simple hypotheses about the mean of a bivariate normal distribution with identity covariance matrix against restricted alternatives. The LRTs and their power functions for such types of hypotheses are derived. Furthermore, through some elementary calculus, it is shown that the power function of the LRT satisfies certain monotonicity and symmetry properties. We treat two cases, the case of one-sided alternatives restricted to some closed convex cone, and the case of two-sided alternatives restricted to a two-sided cone https://jsciences.ut.ac.ir/article_31136_e988d81b705df34d7735e84bdd0220f9.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 AMENABLE WEIGHTED HYPERGROUPS - 31137 EN Journal Article In this paper among many other things we prove that the topological left amenability and left amenability of a weighted hypergroup (K, ?) are equivalent. For a normal subgroup H of K, we define a weight function ?? on KIH and obtain connection between left amenability of (K, ?) and (K|H, ??). Let H be a compact subhypergroup of K. We define the weight function on K||H and obtain connection between left amenability of (K, ?) and (KIIH,??). https://jsciences.ut.ac.ir/article_31137_29ee95b93fb0808302bdd375a72e2de5.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 A MODIFIED THEORY OF NEWTONIAN MECHANICS - 31138 EN Journal Article A specific form of the inertial law is presented by which we can gain a deeper insight into the essence of mass and inertia. In this modified theory, there is no need to keep the concept of absolute space and Newton's third law as principles, By introducing a convenient form for gravitational law the coupling constant G becomes a function of inertial parameters of the universe https://jsciences.ut.ac.ir/article_31138_499d139d7c871d4b41ca6aade4419e42.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 7 4 1996 12 01 LOW-ENERGY-ION ENHANCED DIFFUSION AT THE SURFACE OF METALS - 31139 EN Journal Article Radiation enhanced diffusion at the surface of metals has been observed and studied for low-energy nitrogen ions at the surface of copper. The displacement of the target atoms during irradiation creates vacancies and other defects near the surface, thus enhancing the diffusion of implanted materials toward the surface and also into the solid. The mechanism has been studied here by a special method. An overcoat layer has been evaporated on the surface of the thin film sample following the implantation and the defects have been produced in the overcoat layer by another ion. The original implanted ions are observed to diffuse to the new surface through the open channels created by the auxiliary ions. The effect of this diffusion on the range distributions of low-energy ions in copper has also been discussed https://jsciences.ut.ac.ir/article_31139_c06debb249d4e75425c7f2c2c9e96a5c.pdf