2020-09-19T13:40:18Z
https://jsciences.ut.ac.ir/?_action=export&rf=summon&issue=7383
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
Biophysical Studies on the Interaction of Insulin with a Cationic Gemini Surfactant
P.S.
Pourhosseini
M.
Pirhaghghi
A.A.
Saboury
F.
Najafi
H.
Ghourchian
A novel quaternary ammonium-based cationic gemini surfactant (S<sub>6</sub>) having 1,6 di-bromo hexane as a spacer, have been used and its interaction with insulin in aqueous solution (pH, 7.40) was investigated by several methods including fluorescence spectroscopy, UV-Vis spectroscopy, circular dichroism, dynamic light scattering, ζ-potential measurements, conductivity and transmission electron microscopy. Conductometry and fluorescence studies confirmed the complex formation between S<sub>6 </sub>and insulin. TEM micrographs revealed that the S<sub>6</sub> micelles were of spherical shape with size distribution between 101-140 nm. The critical micelle concentration and some physicochemical properties were determined by conductance measurements. Fluorescence quenching studies in the presence of acrylamide indicated that in the protein-surfactant interaction the solvent accessibility of Tyr residues is reduced. Furthermore CD experiments (far- and near-UV CD) showed that, the content of alpha-helix increases with increasing S<sub>6</sub> concentration and some conformational changes occur in protein structure. The results from dynamic light scattering and ζ-potential measurements showed that insulin charge neutralization and hexamer dissociation take place in the presence of surfactant. Altogether, the S6 cationic Gemini surfactant can be considered as a candidate for insulin delivery.
Cationic gemini surfactant
spectroscopic studies
DLS
Zeta potential
conductometry
2015
06
01
105
115
https://jsciences.ut.ac.ir/article_54642_67b3a57fed186e652dfbd3f3b5a10992.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
Ultrasound Assisted One-pot Synthesis of Dihydropyrimidinones Using Holmium Chloride As Catalyst
S.
Kakaei
H.
Sid Kalal
H.
Hoveidi
<span>A simple and green chemical procedure was reported for the synthesis of dihydropyrimidinones from various aldehydes, ethyl acetoacetate and urea or thiourea using holmium chloride as catalyst. The reactions were performed under solvent free conditions with ultrasound irradiation as the energy source. The advantages of this protocol include the excellent yield, operational simplicity, short time and the avoidance of the use of organic solvents and friendly preparation. Products were identified by mp. and IR, NMR and Mass spectroscopies.</span>
Biginelli reaction
Solvent-free
Ultrasound-assisted
One-pot
Holmium chloride
2015
06
01
117
123
https://jsciences.ut.ac.ir/article_54643_2697fa36306ef65835e2a262449dd2a6.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
A New Heterogeneous Nanocatalyst for Sulfoxidation of Sulfids to Corresponding Adrafinil Analogous: Synthesis, Properties and Applications of VO3-/NH3+-SiO2/Fe3O4
M.J.
Taghizadeh
A.
Javidan
O.
Hosseinchi
A new magnetic nanocatalyst has been prepared using immobilization of vanadate onto aminopropyl functionalized SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>(VO<sub>3</sub><sup>-</sup>/NH<sub>3</sub><sup>+</sup>-SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>). The obtained magnetic catalyst was characterized by FT-IR, XRD, VSM and SEM techniques and used for sulfoxidation of sulfide compounds to the correspondingsulfoxides in presence of H<sub>2</sub>O<sub>2</sub> as oxidant at room temperature. The optimum of reaction conditions and reusability of catalyst have been investigated.
Sulfoxidation
Fe3O4 nanoparticles
SiO2/Fe3O4 nanoparticles
Adrafinil analogues
2015
06
01
125
130
https://jsciences.ut.ac.ir/article_54644_0b84ca56a97499f70fa8b36eafe56904.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
Lutetian Schizaster Fauna (Echinoidea, Spatangoida) from Sargaz Area, South of Kerman, Iran
Y.
Ghasemi Pour Afshar
M-R.
Vaziri
M.
Dastanpour
A.
Lotfabad Arab
The spatangoid genus <em>Schizaster Agassiz </em>is recorded, for the first time, from the Lutetian (Middle Eocene) deposits of Sargaz area, south of Kerman, Iran. The Lutetian sediments of Sargaz region contain a rich and divers echinoid fauna represented by Cidaridae, Conoclypeidae, Echinolampadidae, Toxopneustidae, Phymosomatidae and Schizasteridae. Schizasteroid echinoids are an important component of this fauna. Five Schizasteroid echinoids assigned to genus <em>Schizaster</em> are described and illustrated in the present paper. The <em>Schizaster</em> species are <em>Schizaster ambulacrum</em>, <em>S. archiaci</em>, <em>S. globulus</em>, <em>S</em>. <em>lucidus</em> and <em>S. spado</em>. The <em>Schizaster</em> specimens occur in association with a rich nummulitids and alveolinids fauna, and macro-invertebrates consisting of bivalves and gastropods, which suggest a Lutetian age for the sediment. Associated micro-macro fauna also indicate a warm and shallow water environment was prevailed during the deposition of the sediments.
Schizasteroid echinoids
Middle Eocene
Lutetian
Kerman
2015
06
01
131
138
https://jsciences.ut.ac.ir/article_54645_5d07a586b5822ee7116099e766c08d46.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
High-Pressure Marbles from the Nahavand Area in the Sanandaj-Sirjan Metamorphic Belt, Iran
J.
Izadyar
N.
Skandari
<span>Marbles containing high-pressure mineral assemblage was found from the Sanandaj-Sirjan metamorphic belt in the Nahavand area in western Iran. The high-pressure marbles occur as small bodies or lenses within pelitic schist layers and show compositional banding of carbonate- and silicate- rich bands. Textural analysis revealed two metamorphic stages. The early stage is testified by relicts of the minerals such as rounded jadeite-bearing diopside, epidote (clinozoisite), amphibole 1 (pargasite-edenite) and titanite 1. The second stage (main stage) documented to have phlogopite, chlorite, amphibole 2 (tremolite) and titanite 2. P-T-XCO2 estimates for the early stage of metamorphism give an average pressure, temperature and XCO2 of 13.5 kbar, 670 ºC and 0.35, whereas the second stage has been constrained at P=3.8 kbar, T=500 ºC and XCO2=0.45. The high-pressure mineral assemblage documented in the Nahavand area, were formed during the subduction stage, while the second metamorphic blastesis were recorded during the exhumation event.</span>
High-pressure metamorphism
Nahavand
Sanandaj-Sirjan
Marbles
2015
06
01
139
151
https://jsciences.ut.ac.ir/article_54646_6a93add471c4a58b97013924c2fd48b6.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
Constraining the Water Activity during Peak Metamorphism in a Thermal Aureole; a Mineral Equilibria Approach
M.
Moazzen
In order to assess the presence or absence of fluids under peak metamorphic conditions within the inner aureole of the Etive igneous complex in west Scotland, eight suitable metabasic hornfels samples and one suitable pelitic hornfels were used to calculate water activities using a mineral equilibria. Calculated activities for water are lower than unity in the pelitic sample and extremely low in the metabasic rocks. These low H<sub>2</sub>O activities due to dilution of water by other fluid species are unlikely, since no mineralogical evidence for the presence of other fluids were found in the studied rocks. As a consequence, the low H<sub>2</sub>O activities support fluid-absent conditions during the peak metamorphism of the inner aureole rocks. The findings from this study are in good agreement with calculated water activities using water contents of cordierite in the pelitic rocks for the same part of the aureole, suggesting that cordierite in metapelites retained its syn-metamorphic volatiles.
Contact metamorphism
Water activity
Fluid-absent condition
Mineral equilibria
2015
06
01
151
163
https://jsciences.ut.ac.ir/article_54647_1f14670dbc900860c3786985db2c739c.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
Edge Detection with Hessian Matrix Property Based on Wavelet Transform
N.
Aghazadeh
Y.
Gholizade Atani
<span>In this paper, we present an edge detection method based on wavelet transform and Hessian matrix of image at each pixel. Many methods which based on wavelet transform, use wavelet transform to approximate the gradient of image and detect edges by searching the modulus maximum of gradient vectors. In our scheme, we use wavelet transform to approximate Hessian matrix of image at each pixel, too. The main idea of our methods lies in the fact that, the direction of largest surface curvature is the eigenvector of the Hessian matrix corresponding to the largest absolute eigenvalue. Infact, we use the Hessian matrix's information to increase or decrease the effect of wavelet transform in and directions.</span>
Wavelet transform
Edge detection
Hessian matrix
B-spline Wavelets
2015
06
01
163
170
https://jsciences.ut.ac.ir/article_54648_7c815acf09013ee1c5ef13fe4e18f9c0.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
A Characterization of the Small Suzuki Groups by the Number of the Same Element Order
H.
Parvizi Mosaed
A.
Iranmanesh
A.
Tehranian
Suppose that is a finite group. Then the set of all prime divisors of is denoted by and the set of element orders of is denoted by . Suppose that . Then the number of elements of order in is denoted by and the sizes of the set of elements with the same order is denoted by ; that is, . In this paper, we prove that if is a group such that , where , then . Here denotes the family of Suzuki simple groups, , . This proves that the second and third member of the family of Suzuki simple groups are characterizable by the set of the number of the same element order.
Element order
Sylow subgroup
Simple -group
Suzuki group
2015
06
01
171
177
https://jsciences.ut.ac.ir/article_54649_b9016d7ddd6b44de3979a6084b8ac13e.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
2015
26
2
A Generalization of M-Small Modules
B.
Talaee
In this paper we introduce a generalization of <em>M</em>-small modules and discuss about the torsion theory cogenerated by this kind of modules in category . We will use the structure of the radical of a module in and get some suitable results about this class of modules. Also the relation between injective hull in and this kind of modules will be investigated in this article. For a module we show that <em>N</em> is <em>M-Rad</em> if and only if ; where is the <em>M</em>-injective hull of <em>N</em>. We will show that for a cohereditary module <em>M</em>,<em>R[M]</em> is closed under extension. Let be a module and , the torsion theory cogenerated by is the reject of in , defined as . In this paper we study about the property of this torsion theory. We show that if and only if for every nonzero homomorphism in , . Another attractive result is if and only if , for all . For a module we show that if for some , then the inclusion is <em>M</em>-coRad and also if , then for every submodule of and <em>M</em>-coRad inclusion , we have . Finally for a pseudo projective module M we show that every with is <em>M-Rad</em> and if moreover , then .
M-small module
M-Rad modules
Torsion theory cogenerated by M-Rad modules
2015
06
01
179
185
https://jsciences.ut.ac.ir/article_54650_1eb8a124550b463a22c102ea9d406cf5.pdf