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Search Results: 1 - 10 of 401173 matches for " M. Hatami "
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Senescence process and oxidative stresses induce changes in plant genomic DNA quality  [PDF]
Sedigheh Hatami-Gigloo, S. M. Mahdi Mortazavian, Mojdeh Hatami-Gigloo, Masoud Ghorbani
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.43051
Abstract:

Senescence or programmed cell death is a process that interacts with many biochemical and physiological changes in living organism and is generally induced by aging. Many environmental stresses that accelerate the production of activated oxygen can also induce senescence artificially. One of the important aspects of senescence is possibly degradation of macromolecules such as DNA. It is believed that the random amplification of polymorphic DNA (RAPD) technique is a good method to compare the DNA quality of juvenile and senescence samples in which oxidative stress is induced. In this study, juvenile, senescence and plant paraquat treated leaves from tomato, tobacco and rose, as well as juvenile and senescence human tissues were processed for DNA extraction followed by RAPD technique. We discovered that plant and human genomes are influenced by senescence and environmental stresses underwent genome diversity. Using some molecular markers proved that senescence and oxidative treated samples show different DNA pattern compare to the juvenile-un- treated samples. We also concluded that RAPD technique can be used as a useful tool in genomics study to provide researchers reliable information of DNA quality and can effectively help to resolve the environment condition.

Shot noise in diffusive ferromagnetic metals
M. Hatami,M. Zareyan
Physics , 2006, DOI: 10.1103/PhysRevB.73.172409
Abstract: We show that shot noise in a diffusive ferromagnetic wire connected by tunnel contacts to two ferromagnetic electrodes can probe the intrinsic density of states and the extrinsic impurity scattering spin-polarization contributions in the polarization of the wire conductivity. The effect is more pronounced when the electrodes are perfectly polarized in opposite directions. While in this case the shot noise has a weak dependence on the impurity scattering polarization, it is strongly affected by the polarization of the density of states. For a finite spin-flip scattering rate the shot noise increases well above the normal state value and can reach the full Poissonian value when the density of states tends to be perfectly polarized. For the parallel configuration we find that the shot noise depends on the relative sign of the intrinsic and the extrinsic polarizations.
Algebraic approach for shape invariant potentials in Klein-Gordon equation
M. R. Setare,O. Hatami
Physics , 2009, DOI: 10.1007/s10773-009-0091-1
Abstract: The Shape invariant method has the algebraic structure and its algebras are infinite-dimensional. These algebras are converted into finite-dimensional under conditions. Based on the property of this method we obtain the algebraic structure of some physical potentials in the s-wave Klein-Gordon equation with scalar and vector potential which satisfy the Shape invariant condition.
Seasonal Population Fluctuations of the Rose Aphid, Macrosiphum rosae (L.) (Hemiptera: Aphididae), on Different Cultivars of Roses and Nastaran.
M. Mehrparvar,M. Mobli,B. Hatami
Journal of Science and Technology of Agriculture and Natural Resources , 2008,
Abstract: Rose is one of the most important ornamental shrubs of the world because of its durability, long period of flowering, different cultivars and its beauty. The rose aphid, Macrosiphum rosae is the most important pest of the rose which causes significant economic damage annually. In order to compare four rose cultivars including Black Magic, Caramba, Noa and Good Life, and a wild rose, Nastaran, infested with rose aphid, a split-plot in time experiment was arranged in randomized complete block design layout with three replications, in Isfahan (Iran) from February 2004 to March 2005. The infestation levels of roses with the rose aphid and its seasonal fluctuations were determined by weekly sampling. Analysis of data showed that there are significant differences (P<0.01) between cultivars. Noa (with pink flowers) has the highest infestation of rose aphid (with average 23.12 ± 0.036 aphids) and Caramba (with yellow flowers) has the lowest infestation (with average 6.46 ± 0.036 aphids). The wild rose, Nastaran, showed low infestation (with average 8.76 ± 0.036) as well. Different sampling times also showed significant differences (P<0.01). There was a significant interaction (P<0.01) between cultivars and sampling date, such that reactions of cultivars to aphid (nymphs, adults and total) were not similar in different sampling dates. Seasonal fluctuations of the rose aphid showed two peaks in a year, in May and December. Activity of the rose aphid in spring which coincides with rapid growth and tenderness of rose foliage causes severe fading and inhibiting of floral opening.
Exact Solutions of the Dirac Equation for an Electron in a Magnetic Field with Shape Invariant Method

M R Setare,O Hatami,

中国物理快报 , 2008,
Abstract: Based on the shape invariance property we obtain exact solutions of the Dirac equation for an electron moving in the presence of a certain varying magnetic field, then we also show its non-relativistic limit.
A New Approach for Numerical Simulation of Pulse Propagation in Non-Uniform Fiber Bragg Grating
F. Emami,A. H. Jafari,M. Hatami
IAENG International Journal of Applied Mathematics , 2012,
Abstract:
The Effect of Drought Stress on Population Density and Damage of Safflower Fly (Acanthiophilus helianthi ), Aphid (Uroleucon carthami ) and Leafhopper Empoasca decipiens
B. Hatami,J. Khajehali,M. R. Sabzalian
Journal of Science and Technology of Agriculture and Natural Resources , 2008,
Abstract: Safflower having oil with high unsaturated fatty acids is a very valuable plant. However the sensitivity of safflower to some pests as safflower fly (Acanthiophilus helianthi), particularly in drought stress conditions has limited its production. In order to evaluate the effect of drought stress on population density and damage of important safflower pests, especially safflower fly, an experiment was conducted in the field using 5 irrigation treatments including 50, 70, 90, 110 and 130 mm evaporation from class A pan in a randomized complete block design with three replications. The local safflower variety used in this study was Isfahan land variety, Kooseh. In each irrigation regime, the half of one plot was locally sprayed by Chlorpyrifos in 2ml per liter of water to be compared with non-sprayed part. During 8 weeks of sampling, population of aphids, Uroleucon carthami, leafhopper, Empoasca decipiens and safflower fly, A. helianthi and also percentage of damaged heads by safflower fly were measured. The results showed that in non-sprayed conditions, the highest safflower fly (2.38 flies per net) and aphid population (165.57 aphids per plant) was observed at 130 mm evaporation regime. Drought stress also decreased (30.23 %) safflower seed yield. Severe drought stress together with non-spaying may increase safflower pests population particularly safflower fly and reduce seed yield. However low level of drought stress (70 mm evaporation from class A pan) may decrease relative number of insects and save irrigation water. Drought stress also decrease the population of leafhopper. In this study, 70 mm evaporation regime was the optimum irrigation treatment regarding lower aphid and fly damage (15.86% damaged heads in non-sprayed condition) and higher safflower seed yield (1687.5 kg/ha in sprayed condition).
Study on Life and Fertility Tables of Elm Leaf Beetle, Xanthogaleruca luteola Müller,on Four Different Hosts under Laboratory Conditions
M. Khalili Mahani,H. Seyedoleslami,B. Hatami
Journal of Science and Technology of Agriculture and Natural Resources , 2004,
Abstract: Elm leaf beetle, Xanthogaleruca luteola (Müller), life and fertility tables were investigated under laboratory conditions (25±2°C, 70±5%R.H. and 16L: 8D), on Ulmus carpinifolia, U.c.var.umbraculifera, U. glabra var. pendula and Celtis caucasica, in spring and summer. Since the experiments were conducted under controlled conditions, feeding on hosts with different nutritional qualities was considered to be the only cause of mortality. The aim of this study was to determine the susceptible hosts to the pest. The initial population for each life table was 100 first larval instar on 20 cm foliage which continued to the end of adult longevity. For larval and adult feeding, the foliage was replaced regularly. Larval and adult mortality and eggs number per female were recorded on a daily basis. Results showed that the net reproductive rate (R0) and intrinsic rate of increase (rm) were higher on U. carpinifolia than the other hosts in both seasons. The net reproductive rate was less than one on Celtis caucasica in spring and on U. c. var. umbraculifera in summer, which represented the negative population growth on these hosts. Therefore, U. carpinifolia was the most susceptible host to Elm leaf beetle, the other susceptible hosts being U. glabra var. pendula and U. c. var. umbraculifera, in a descending order and Celtis caucasica was the least susceptible one. .
Temperature Variations Analysis for Condensed Matter Micro- and Nanoparticles Combustion Burning in Gaseous Oxidizing Media by DTM and BPES
M. Hatami,D. D. Ganji,K. Boubaker
ISRN Condensed Matter Physics , 2013, DOI: 10.1155/2013/129571
Abstract: Combustion process for iron particles burning in the gaseous oxidizing medium is investigated using the Boubaker polynomial expansion scheme (BPES) and the differential transformation method (DTM). Effects of thermal radiation from the external surface of burning particle and alterations of density of iron particle with temperature are considered. The solutions obtained using BPES technique and DTM are compared with those of the fourth-order Runge-Kutta numerical method. Results reveal that BPES is more accurate and reliable method than DTM. Also the effects of some physical parameters that appeared in mathematical section on temperature variations of particles as a function of time are studied. 1. Introduction Combustion of metallic particles is one of the most challenging issues in industries that manufacture, process, generate, or use combustible dusts, and an accurate knowledge of their explosion hazards is essential. Many studies have been done for estimating and modeling the particle and dust combustion. Haghiri and Bidbadi [1] investigated the dynamic behavior of particles across flame propagation through a two-phase mixture consisting of micro-iron particles and air. They assumed three zones for flame structure: preheat, reaction, and postflame (burned). Liu et al. [2] analyzed the flame propagation through hybrid mixture of coal dust and methane in a combustion chamber. A one-dimensional, steady-state theoretical analysis of flame propagation mechanism through microiron dust particles based on dust particles’ behavior with special remark on the thermophoretic force in small Knudsen numbers is presented by Bidabadi et al. [3]. Haghiri and Bidabadi [4] performed a mathematical model to analyze the structure of flame propagating through a two-phase mixture consisting of organic fuel particles and air. In contrast to previous analytical studies, they take thermal radiation effect into consideration, which has not been attempted before. Recently, Bidbadi and Mafi [5] solved the nonlinear energy equation that resulted from particle combustion modeling by using homotopy perturbation method (HPM), and they presented equations for calculating the convective heat transfer coefficient and burning time for iron particles. Because HPM needs perturbation and a small parameter, it can be solved by other high-accuracy analytical methods where in the present study two of them are presented and compared with fourth-order Runge-Kutta numerical method. Polynomial expansion methods are extensively used in many mathematical and engineering fields to yield meaningful
Perfect dominating sets in the Cartesian products of prime cycles
Hamed Hatami,Pooya Hatami
Mathematics , 2006,
Abstract: We study the structure of a minimum dominating set of $C_{2n+1}^n$, the Cartesian product of $n$ copies of the cycle of size $2n+1$, where $2n+1$ is a prime.
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