2018-02-21T12:32:36Z
http://ijsts.shirazu.ac.ir/?_action=export&rf=summon&issue=143
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
In vitro antioxidant and antimicrobial activity of some Lamiaceae species
Sevil
Albayrak
Ahmet
Aksoy
Songul
Albayrak
Osman
Sagdic
The methanolic extracts, infusions, decoctions and hydrosols of six plants were investigated for their total phenolic contents, antioxidant and antimicrobial activities: Mentha piperita (Peppermint), Thymus vulgaris (thyme), Melissa officinalis (lemon balm), Ocimum basilicum (basil), Rosmarinus officinalis (rosemary) and Salvia officinalis (sage) (Lamiaceae). Total phenolic contents were determined by Folin-Ciocalteu procedure and ranged from 111.03 ± 0.6 (sage methanolic extract) to 19.07 ± 0.0 mg (basil methanolic extract) gallic acid equivalent /g extract. The antioxidant activity was evaluated by two methods, DPPH and phosphomolybdenum assays. The decoction of rosemary showed the highest DPPH radical scavenging activity (IC 50 = 8.36 μg/mL). The methanolic extract of Peppermint showed the highest total antioxidant activity (241.85 ± 1.9 mg ascorbic acid equivalent /g extract) measured by phosphomolybdenum assay. The antimicrobial activities of herbs were tested against eight bacteria and two yeasts.
antimicrobial activity
antioxidant activity
DPPH
Lamiaceae
phenolics
2013
03
01
1
9
http://ijsts.shirazu.ac.ir/article_1529_a25cd2f632d65a8d4ad1771673b16d92.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Hydrothermal garnet in porphyry copper related skarn deposits, Ali-Abad, Yazd Province, Iran
B.
Taghipour
F.
Moore
M. A.
Mackizadeh
S.
Taghipour
The Ali-Abad porphyry copper deposit is located in the Central Iranian magmatic belt. As a result of subduction magmatism, Oligo-Miocene leucogranitoid rocks have intruded into conglomerates of lower Cretaceous age. Due to contact metamorphism the following mineral assemblage has occurred in the altered conglomerate: Garnet (andradite-grossular) + epidote+ quartz + calcite + pyrite Skarnification have only occurred in reactive carbonate clasts of the conglomerates. Chemical composition of garnets and classic discrimination scheme imply the porphyry copper related skarn-type mineralization. Garnets are characterized by abrupt chemical zoning area and thin bands. REE pattern of skarn garnet and host granite have similar trends, so it is concluded that garnets are hydrothermal in origin. The garnet mineralization episode occurred during skarnification, giving hydrothermal fluid temperatures of 422-472 ºC, likely this episode corresponds to the fluid boiling and high fO2 of garnet forming processes in the skarn system. Probably, the temporal decrease of hydrothermal fluid pressure led to rapid growths of andradite zones i.e., extensive hydrofracturing, porosity of conglomerate could be the dominant conditions which led to boiling of hydrothermal fluids and precipitation of andradite garnet.
Garnet
skarn
copper deposit
hydrothermal fluids
2013
03
01
11
22
http://ijsts.shirazu.ac.ir/article_1530_c63e0484a7f0f676d7f3bec8461ee45b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Solution of time fractional diffusion equations using a semi-discrete scheme and collocation method based on Chebyshev polynomials
H.
Azizi
B.
Loghmani
In this paper, a new numerical method for solving time-fractional diffusion equations is introduced. For this purpose, finite difference scheme for discretization in time and Chebyshev collocation method is applied. Also, to simplify application of the method, the matrix form of the suggested method is obtained. Illustrative examples show that the proposed method is very efficient and accurate.
Time fractional diffusion equation
finite difference
collocation
Chebyshev polynomials
2013
03
01
23
28
http://ijsts.shirazu.ac.ir/article_1531_166076673de2c96ebd7408cc881964b4.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Calculation of exposure buildup factors for point isotropic gamma ray sources in stratified spherical shields of water surrounded by lead and optimization of water-lead combination
A.
Shirani
M. H
Alamatsaz
Exposure buildup factors have been calculated by Monte Carlo method for point isotropic gamma ray sources, penetrating a two-layer spherical shield of water surrounded by lead, and the effect of bremsstrahlung radiation on buildup factors has, in particular, been investigated, the results of which are in good agreement with previous works. The buildup factors were then calculated for various combinations of water and lead layers at some gamma ray energy points in the range from 0.04 MeV to 10 MeV and for shield thicknesses from 1 to 10 mean free paths (mfp). From the results obtained, one can select the proper (or optimum) water and lead combination which results in minimum value of buildup factor for a two-layer water-lead shield of a given thickness (in mfp) at each energy point. Here the optimization analysis has been performed for a shield of 10 mfp thick at gamma ray energies from 0.04 MeV to 10 MeV.
Stratified shields
Monte Carlo simulation
buildup factors
bremsstrahlung radiation
2013
03
01
29
34
http://ijsts.shirazu.ac.ir/article_1534_0efba051d402694fa071892d688e992b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Simultaneous control of linear systems by Genetic Algorithms in state and output feedback
F.
Saadatjoo
V.
Derhami
S. M.
Karbassi
In this paper, Genetic Algorithms (GAs) are employed to control simultaneous linear systems in both state and output feedback. First, the similarity transformation is applied to obtain parameterized controllers. This requires solution of a system of equations and also some non-linear inequalities. GAs are used to solve these equations and inequalities. Therefore, the paper presents an analytical method for finding parameterized controllers and employs a numerical method to enhance the solution. Three numerical examples are presented to illustrate the effectiveness of the method and to compare the results with previous results.
Linear Systems
Genetic Algorithms
simultaneous control
Optimization
eigenvalue assignment
2013
03
01
35
43
http://ijsts.shirazu.ac.ir/article_1535_069b44987586d009558ec13e90ebff2b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
A study on Chironomid larvae (Insecta- Diptera) of
Golpayegan River (Isfahan-Iran) at generic level
M.
Ebrahimnezhad
E.
Allahbakhshi
Little is known about Chironomidae in Iran. This article is the second one on chironomid larval identification in
running waters of Iran. Samples were collected from five sites in the Golpayegan River, (Isfahan-Iran), about 55
km along the river course. The sampling was done four times: February and November 2003, May and July 2004.
Samples were hand sorted in the laboratory and the larvae identified at generic level, using available identification
keys. Thirty five genera were identified in four subfamilies, including Chironominae (15 genera), Orthocladinae
(13 genera), Tanypodinae (5 genera) and Diamesinae (2 genera). 17 genera of these are reported from the
Golpayegan River for the first time.
Chironomidae
chironomid genera
Golpayegan River
Iran
2013
03
01
45
52
http://ijsts.shirazu.ac.ir/article_1536_a2be4033291074fed7aea0aeb2be6283.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Chebyshev cardinal functions: An effective tool for solving nonlinear Volterra and Fredholm integro-differential equations of fractional order
S.
Irandoust-pakchin
H.
Kheiri
S.
Abdi-mazraeh
A computational method for numerical solution of a nonlinear Volterra and Fredholm integro-differentialequations of fractional order based on Chebyshev cardinal functions is introduced. The Chebyshev cardinaloperational matrix of fractional derivative is derived and used to transform the main equation to a system ofalgebraic equations. Some examples are included to demonstrate the validity and applicability of the technique.
2013
03
01
53
62
http://ijsts.shirazu.ac.ir/article_1537_0d94383cb154095966e774a0c20d4391.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
The response of anther and pollen development, pollen cellular material release and pollen proteins to air pollution in Petunia hybrida Juss. (Solanaceae)
F.
Rezanejad
The study aimed to investigate the microsporogenesis, tapetum and pollen development in Petunia hybrida Juss.under control and air pollution condition. The connective shows a well-developed placentoid, giving thesporogenous tissue a crescent-shape. The sporogenous tissue of each of the four anther locules is surrounded bydimorphic tapetum. The outer (towards the epidermis) and inner (towards the connective) tapetal layers differ inshape, staining intensity and degree of vacuolization. During microsporogenesis and pollen maturation, thetapetum undergoes several changes and ultimately degenerates after pollen mitosis. The tapetum is the secretorytype. Microsporogenesis with simultaneous cytokinesis forms tetrahedral tetrads of microspores. Mature pollengrains are prolate, tricolporate/tricolporoidate with furrows disposed along the polar axis and three lowlydeveloped pores with striate-reticulate sculpture. Under air pollution, microsporogenesis was normal till tetradstage. After this stage, some tetrahedral tetrads were still present and some pollen grains were irregular shaped,shrunk and fragile. Some tapetal cells were smaller and the number of their nuclei was less compared to those ofthe control. Cellular material release was higher in polluted pollen. SDS-PAGE pattern in polluted pollen did notshow significant difference compared to the control.
Airborne particulate material (APM)
connective
microsporogenesis
protein bands
Tapetum
2013
03
01
63
68
http://ijsts.shirazu.ac.ir/article_1538_d6b09182523df059f96601f90a588c63.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Geometrical Categories of Generalized Lie Groups and Lie Group-Groupoids
M. R.
Farhangdoost
T.
Nasirzade
In this paper we construct the category of coverings of fundamental generalized Lie group-groupoid associatedwith a connected generalized Lie group. We show that this category is equivalent to the category of coverings of aconnected generalized Lie group. In addition, we prove the category of coverings of generalized Lie groupgroupoidand the category of actions of this generalized Lie group-groupoid on a connected generalized Lie groupare equivalent.
Lie groupoid
Lie group
Generalized Lie group
Homotopy of topological groups
2013
03
01
69
73
http://ijsts.shirazu.ac.ir/article_1539_d2b3b087ae633e4d8582ad88e3e085ed.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
4-Dodecylbenzenesulfonic acid (DBSA) as an efficient and recyclable catalyst for synthesis of 14-aryl- and 14-alkyl-14-H-dibenzo [a,j]xanthenes under solvent-free conditions
H.
Hashemi
R.
Sardarian
14-Aryl- and 14-alkyl-14-H-dibenzo [a,j]xanthenes are prepared from the reaction of aromatic- and aliphaticaldehydes with β-naphthol in the presence of catalytic amounts of 4-dodecylbenzenesulfonic acid(DBSA) as asurfactant-type Brønsted acid catalyst in toluene and under solvent-free conditions in excellent yields and shortreaction times. The catalyst was recovered and reused for five successive times without considerable loss in itsactivity.
4-Dodecylbenzenesulfonic acid (DBSA)
β-Naphthol
Benzoxanthenes
Solvent-free
2013
03
01
75
82
http://ijsts.shirazu.ac.ir/article_1540_48c23fbc33b67ab2bcfd59033e7f40d2.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Analytical approximate solutions of fractionel convection-diffusion equation with modified Riemann-Liouville derivative by means of fractional variational iteration method
M.
Merdan
In this article, an analytical approximate solution of nonlinear fractional convection-diffusion with modifiedRiemann-Liouville derivative was obtained with the help of fractional variational iteration method (FVIM). A newapplication of fractional variational iteration method (FVIM) was extended to derive analytical solutions in theform of a series for this equation. It is indicated that the solutions obtained by the FVIM are reliable and aneffective method for strongly nonlinear partial equations with modified Riemann-Liouville derivative.
Fractional variational iteration method
fractional convection-diffusion equation
Riemann-Liouville
derivative
2013
03
01
83
92
http://ijsts.shirazu.ac.ir/article_1541_68cbfc71d1d42e09a2ed01df92adea29.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2013
37
1
Heteroalkyl oxime derivative can cause damage to bacterial DNA
K.
Abdolahi
S.
Mohsenzadeh
H.
Mohabatkar
Z.
Faghih
A.
Khalafi-Nezhad
The present study aimed to evaluate the antimicrobial activity of a hetroalkyl oximec synthetic compoundderivative (Benzophenone O-4-bromoethyl oxime) against two gram positive and three gram negative bacteria.The antibacterial characteristic of this compound was shown using the circular zone diameter of bacterial growthinhibition by disk-diffusion method. In addition, the random amplified polymorphic DNA (RAPD) techniqueusing twenty-three primers was performed to investigate the DNA polymorphism of bacteria that were affected bythe synthetic chemical drug. Among these, only 18 primers were found efficient for reproducible banding pattern.Disappearance or appearance of bands between controls and treatments confirm rearrangements and DNAdamages in the priming binding sites of bacterial genome. The results show that the RAPD method can be a usefulidentification tool for studying the DNA polymorphism created by synthetic chemical drugs. The results obtainedwith this technique showed significant differences between the RAPD profiles.
Antibacterial
DNA polymorphism
RAPD
synthetic drug
2013
03
01
93
97
http://ijsts.shirazu.ac.ir/article_1542_4b227803b2f363c329969efe10bcdc07.pdf