University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 PURIFICATION AND PROPERTIES OF AN EXTRACELLULAR PROTEASE PRODUCED BY PENICIUIUM EXPANSUM - 31331 EN Journal Article Penicilliurn expamum grown in a medium with rice husk as a carbon source produced an extracellular protease. The protease enzyme was isolated from culture broth by fractionation with acetone and column chromatography on Sephadex G- 100 and DEAE A-50. The protease enzyme was purified about 17.47 fold, with a recovery of 14%. The purified protease was homogenous on SDS polyacrylarnide disc gel electrophoresis and molecular weight was calculated to be 28000. The optimum activity of protease was found at pH 7.5 and temperature 30°C. The enzyme activity was enhanced on addition of Ca , Zn , Co and Mn whereas inhibition was observed in the presence of EDTA, Hg and Ag . Addition of cysteine and 2- mercaptoethanol did not produce any significant effect on protease activity https://jsciences.ut.ac.ir/article_31331_d0cefa43d15f7e4b74ae21595155ec91.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 POLYPHENOL OXIDASE ACTIVITY AND DIFFERENTIATION OF RHIZOMORPH IN ARMILLARIA MELLEA (VAML. EX. FR.) KARST - 31332 EN Journal Article Polyphenol oxidase (PPO) activity varied in differentiation from hyphae to rhizomorph and croute in A. mellea. In undifferentiated hyphae there was not any PPO activity, while croute showed the highest activity. Electrophoresis in the presence of SDS allows the detection of intensive enzyme forms of PPO, and can also convert slower migrating enzyme forms to faster ones. Some fluorescent compounds, as intense activators of PPO, show an intense band of PPO in electrophoresis but not in the migrating band https://jsciences.ut.ac.ir/article_31332_65903d6bc9979bfb4817643c0e12b11e.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 THE EFFECTS OF COPPER ON CYTOCHROMES BIOSYNTHESIS, CELL DIVISION IWD MUTAGENESIS IN PARACOCCUS DENITRIFICANS - 31333 EN Journal Article https://jsciences.ut.ac.ir/article_31333_7560d81fe93291a77fe0c856f1e985b9.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 INTERACTION OF DOXORUBICIN WITH DNA-HMG1 COMPLEX - 31334 EN Journal Article In this study, the interaction of the anthracycline antibiotic doxorubicin with DNA-HMG 1 complex was investigated employing UV/VIS spectroscopy, thermal denaturation and DNA cellulose chromatography techniques. The results indicated that the binding of doxorubicin to the protein reduces its Tm in a dose dependent manner. Although doxorubicin protects free DNA against thermal denaturation in the presence of HMG 1, thermal melts represent biphasic profile corresponding to DNA- drug, HMG1- drug and free components. Interaction of antibiotic with DNA - HMGl complex using DNA cellulose columns also implies that the drug binds strongly to singlestranded DNA-HMG 1 complex rather than to double- stranded DNA-HMG 1 columns. The results suggest destabilization of HMGl protein by drug action thereby preventing DNA-HMG 1 complex formation https://jsciences.ut.ac.ir/article_31334_794f4d170884d586a02eb907a0c9c0dd.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 PREPARATION AND CHARACTERIZATION OF [Ni (MAP) ] ; H- MAP = 2- (METHYLAMINO) PYRIDINE H. Aghabozorg* and H. H. Monfared - 31335 EN Journal Article We have recently synthesized [Ni (MAP) ] complex [H-MAP= 2- (methylamino) pyridine]. 2- (Methy1amino)pyridine reacts with MeLi in THF and generates the lithium salt (Li-MAP). Further reaction of NiCl with two equivalent of this ligand in THF leads to the formation of a dark red solution. Analytical data, molecular weight, and magnetic susceptibility of this complex confirm the formula [Ni (MAP) ] . https://jsciences.ut.ac.ir/article_31335_6dfbdd2796f306866bd7fa91b79f2339.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 SYNTHESIS OF A SPECIAL TYPE OF ZEOLITE FROM ANALCIME FAMILY WITH TRIETHANOLAMINE AND ITS CHARACTERIZATION WITH XRD, FTIR AND SEM - 31336 EN Journal Article A type of zeolite from the analcime family was prepared by using triethanolamine, silica gel and sodium aluminate. The average particle size was around 24 µm. FTIR, XRD and SEM results approved the type of zeolite which was formed https://jsciences.ut.ac.ir/article_31336_f3ff7b1a6f1b2455187c4a8b8c2c373c.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 SYNTHESIS OF 4,4'-BIS-PYRIMIDINES AND SOME RELATED BIS-FUSED PYRIMIDINES - 31337 EN Journal Article 2,2'-Disubstitutedamino-4-4'-bis-pyrimidines (3a-m) have been prepared by linking 2,4-dichloro-6-methyl-5-nitropyrimidine (1) with several diamines and subsequent reaction with suitable amines. Some of these compounds (3c and 3j) which were reduced catalitically, on treatment with nitrous acid, urea in pyridine, and boiling thionyl chloride gave the corresponding bistriazolopyrimidin (6), bis-purines (7), and bis-isothiazolopyrimidines (8). Two bis-imidazo[l,2-a] pyrimidines (9 and 10) have also been prepared https://jsciences.ut.ac.ir/article_31337_6f3249aa304055d63828af3bfab778f6.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 LITHIUM PERCHLORATE MEDIATED AMINATION REACTION OF ALDEHYDES: A NOVEL METHOD FOR SYNTHESIS OF N, N-DIALKYL-p-SILYLATED AMINES* - 31338 EN Journal Article P-Silylated N,N-dialkyl amines (5) were easily synthesized in good to excellent yield from aldehydes (1), trimethylsilyldialkylamines (2), and trimethylsilylmethylmagnesium chloride (4) in the presence of 5 M lithium perchlorate solution in diethyl ether. The reaction Of (2) with aldehyde proceeded smoothly in the LiCI0 , to give the imimum salt (3). Addition of trimethylsilylmethylrnagnesium chloride (4) gave the desired product https://jsciences.ut.ac.ir/article_31338_f512bcc142683f9185ea27c41855ed64.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 SELENIUM HETEROCYCLE XL II [1]. SYNTHESES OF SUBSTITUTED THIAZOLO, SELENAZOLO AND 1,2,3-SELENADIAZOLOINDOLES - 31339 EN Journal Article Reaction of compound 1 with thiobenzarnide or substituted selenobenzamides afforded substituted pyrrolobenzothiazole or selenazoles (2) respectively. Selenium dioxide oxidation of the semicarbazone 4 with selenium dioxide gave 6- benzenesulfonyl- 4,5-dihydro-pynolo [3,2-el benzoselenadiazole (5). https://jsciences.ut.ac.ir/article_31339_c8ee0c6255707903688cf23566daba69.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 STATISTICAL-MECHANICAL CALCULATION OF THERMODYNAMIC PROPERTIES OF ALBITE USING A TWO-DIMENSIONAL MODEL - 31340 EN Journal Article https://jsciences.ut.ac.ir/article_31340_5963591837f554529b3d9c4e209b74a0.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 AXIAL FLOW OF CASSON PLASTIC MODEL IN ANNULUS WITH A ROTATING INNER CYLINDER - 31341 EN Journal Article https://jsciences.ut.ac.ir/article_31341_0c0e943e54b33403a001386b2c3da054.pdf

University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 3 1995 08 01 HELICITY AND PLANAR AMPLITUDES IN PION-PROTON SCATTERING AT 6.0 GeV/c - 31342 EN Journal Article In addition to optimal conditions, invariant laws of Lorentz, parity and time reversal are imposed to find the relation between observables (spin rotation parameters) and bilinear combination of helicity amplitudes in pion-proton elastic scattering at 6.0 GeV/c. By normalizing the differential cross-section to unity, the magnitudes of helicity amplitudes and the angle between them are determined. Planar amplitudes are found in terms of the helicity amplitudes and the angle between momentum vector and quantization direction in the reaction plane. https://jsciences.ut.ac.ir/article_31342_723b06b9337aafbd3b995b1cd5da5e72.pdf