OALib Journal期刊

ISSN: 2333-9721




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匹配条件: “Seyed Mohsen Hosseini” ,找到相关结果约4750条。
Effect of Weed Competition, Planting Time and Depth on Pistacia atlantica Seedlings in a Mediterranean Nursery in Iran
Hosseini,Seyed Mohsen; Gholami,Shaiesteh; Sayad,Ehsan;
Silva Lusitana , 2007,
Abstract: the effect of weed competition, planting time and depth on growth and survival of pistacia atlantica seedlings was evaluated in nursery conditions. pistacia atlantica is a deciduous tree species that belongs to the anacardiaceae family. it is valuable for soil conservation and therefore suitable for plantation in dry lands. regeneration of pistacia atlantica in western part of iran presents problems due to much destruction of its natural habitats. two levels of weed treatment (weed competition was removed several times by hand or the weeds permitted to grow) and three levels of sowing date (9 january, 29 january, 18 february) were used. in addition, seeds were sown at three different depths (0.4 and 8 cm) but no seedlings emerged when seeds were sown at 0 cm sowing depth. at the end of the first growing season on september 2004, survival, height above the soil surface, collar diameter, shoot/root length ratio and shoot/root dry weight ratio were measured. survival was significantly affected by sowing depth but not by sowing date and weed treatment. survival was greater at 4 cm than at 8 cm sowing depth. collar diameter was significantly greater at 4 cm than at 8 cm sowing depth and in 9 january and 29 january than in 18 february sowing date but was not different between weed treatments. shoot/root length ratio and height was not affected by sowing date, sowing depth and weed treatment. shoot/root dry weight ratio was significantly lower at 4 cm sowing depth but not affected by sowing date. this ratio was greater in weed competition condition. in general weed treatment, sowing date and sowing depth are factors that can influence physical and morphological traits of seedlings.
Effect of Soil, Sowing Depth and Sowing Date on Growth and Survival of Pistacia atlantica Seedlings
Shayesteh Gholami,Seyed Mohsen Hosseini,Ehsan Sayad
Pakistan Journal of Biological Sciences , 2007,
Abstract: The effect of soil, sowing depth and sowing date on growth and survival of Pistacia atlantica seedlings was evaluated in nursery conditions. Pistacia atlantica is a deciduous tree species that belongs to the Anacardiaceae family. It is valuable in soil conservation and so suitable for plantation in dry lands. Regeneration of Pistacia atlantica in western part of Iran due to much destruction to its natural habitats has problems. Two levels of soil (Forest and nursery soil) and three levels of sowing date (9 and 29 January, 18 February) were used. In addition, seed were sown at three different depths (0, 4 and 8 cm) but no seedlings emerged when seeds were sown at 0 sowing depth. At the end of first growing season on September 2004 survival, height above the soil surface, collar diameter, shoot/root length ratio and shoot/root dry weight ratio were measured. Survival was significantly affected by sowing date and sowing depth but not by soil. Survival was greater at 4 cm than at 8 cm sowing depth and in 9 January and 29 January than in 18 February sowing dates. Collar diameter and height were significantly greater in nursery soil and 9 January and 29 January sowing date but were not different among sowing depths. Shoot/root ratio and shoot/root dry weight ratio were significantly lower in forest soil but not affected by sowing date. Shoot/root dry weight ratio was lower in 4 cm sowing depth while shoot/root ratio did not showed any difference among sowing depth. In general soil type, sowing date and sowing depth are factors that can be influence on physical and morphological traits of seedlings.
Behzad Kord,Seyed Mohsen Hosseini Kiakojouri
BioResources , 2011,
Abstract: Polypropylene/wood flour composites having different nanoclay and glass fiber contents were fabricated by melt compounding and then injection molding. The physical and mechanical properties were evaluated. The results showed that the tensile modulus and tensile strength of the PP/wood flour composites increased with increasing glass fiber content. However, the impact strength of the PP/wood flour composites progressively decreased with increasing glass fiber content. Dimensional stability of the composites could be improved by increasing the glass fiber content. Also, results indicated that the tensile modulus and tensile strength of composites increased with increase of nanoclay up to 4phc and then decreased. However the impact strength and water absorption of the composites decreased with increasing the nanoclay loading. The morphology of the nanocomposites was examined by using X-ray diffraction (XRD). Morphological findings revealed an intercalated form in the sample with 4 per hundred compounds (phc) concentration of nanoclay, which implies the formation of an intercalated morphology and better dispersion than 6phc, and the d-spacing of clay layers were improved in the composite in the presence of compatibilizer. This project has shown that the composites treated with glass fiber and nanoclay will be desirable as building materials due to their improved stability and strength properties.
PNR: New Position based Routing Algorithm for Mobile Ad Hoc Networks
Hossein Ashtiani,Shahpour Alirezaee,seyed mohsen mir hosseini,HamidKhosravi
Lecture Notes in Engineering and Computer Science , 2009,
Reduction of the severity of ischemia reperfusion-induced pancreatitis by ischemic pre-conditioning of the liver
Nikeghbalian Saman,Mansoorian Mohsen,Hosseini Seyed Mohammad,Mardani Parviz
Saudi Journal of Kidney Diseases and Transplantation , 2009,
Abstract: Pre-conditioning by brief exposure to ischemia does not only protect the concerned organ against subsequent severe ischemic damage, but also has protective effect on other organs, which is called remote pre-conditioning. Our aim in this study was to evaluate the protective effect of brief liver ischemia on the pancreas against severe ischemia-reperfusion-induced pancreatitis. This study was performed on 30 male wistar rats. Ischemic pre-conditioning of liver was performed by first clamping of the hepatic pedicle for 10 minutes. Following this, ischemia-reperfusion of the pancreas was performed by first clam-ping the inferior splenic artery for 30 minutes, followed by reperfusion for one hour. The rats were divided into three groups (10 rats in each group). Group-One was the sham operated group, without clamping of any artery. Group-two developed ischemia-reperfusion-induced pancreatitis, without ischemic pre-conditioning of the liver, while Group-three underwent ischemic pre-conditioning of the liver followed by ischemia-reperfusion of the pancreas. Ischemic pre-conditioning, applied prior to induction of pancreatitis, caused a reduction in plasma lipase, plasma interleukin-1β and histological signs of pancreatic damage, but plasma interleukin-10 levels were not significantly different between the three groups. Ischemic pre-conditioning of the liver did not cause any alteration of the liver enzymes. Our study suggests that ischemic pre-conditioning of the liver reduces the severity of ischemia-reperfusion-induced pancreatitis. These effects are partly related to the reduction of pro-inflammatory interleukin -1β.
The Effects of Isoproterenol and Propranolol on Cytokine Profile Secretion by Cultured Tumor-infiltrating Lymphocytes Derived from Colorectal Cancer Patients
Shahram Seyedi,Alireza Andalib,Abbas Rezaei,Seyed Mohsen Hosseini
Cell Journal , 2012,
Abstract: Objective: Anti-tumor immunity and cytokine profiles have important roles in the developmentof cancer. Norepinephrine (NE) release due to sympathetic activation leads toa Th2 deviation via the beta-2 adrenergic receptor (β-2AR) and could increase cancerprogression. This study intends to determine the effects of isoproterenol (ISO; betaagonist)and propranolol (PRO; beta-antagonist) on the production of IFN-γ, IL-4, andIL-17. Cytokine levels have been examined in tumor-infiltrating lymphocytes (TILs) andperipheral blood mononuclear cells (PBMCs) of patients with colorectal cancer (CRC).The β-2AR expression on lymphocyte subsets was also assessed.Materials and Methods: In this experimental study, TILs were isolated from freshCRC tissue and patient PBMCs were obtained just prior to surgery. The cells werecultured in medium for 72 hours. Concomitantly, cells were stimulated with 10 μg/ml phytohemagglutinin (PHA) alone or in the presence of either 1 μmol/L of PRO or1 μmol/L ISO. The concentration of cytokines in the supernatants was measured byELISA. Three-color flow cytometry was used to determine the expression of β-2AR onthe lymphocyte subsets. Statistical analyses were performed via paired or independentt-test.Results: Levels of IFN-γ, IL-4 and IL-17 were elevated after PHA-stimulation of PBMCsand TILs. However, the elevation of IFN-γ and IL-17 production by TILs in response to PHAwas significantly lower than PBMCs. In the presence of ISO, the IFN-γ/IL-4 ratio reducedin all groups, but this reduction was very low in TILs. Interestingly, the effects of PRO oncytokine production were, at least partially, comparable to those of ISO. Depressed levelsof β-2AR expression were demonstrated on CD4+IFN-γ+ and CD4+IL-17+ lymphocytesin patients’ PBMCs and TILs.Conclusion: This study has demonstrated the effects of ISO and PRO on cytokine productionby TILs and determined β-2AR expression on these cells. ISO failed to induce ashift toward the expected Th2 cytokine profile in CRC patients’ TILs, which might be due tothe downregulation of β-2AR expression on TILs. Additionally, in this study, PRO induceda shift to a Th2 profile in PBMCs.
Center vortex model and the G(2) gauge group
Sedigheh Deldar,Hadi Lookzadeh,Seyed Mohsen Hosseini Nejad
Physics , 2010, DOI: 10.1063/1.3574984
Abstract: The thick center vortex model is applied to G(2) gauge group to obtain the potentials between static sources of the fundamental and adjoint representations. The group G(2) has only one trivial center element and therefore it does not have any vortices which are defined based on non trivial center elements. To obtain the potential from the thick center vortex model, the idea of the vacuum domain structure is used. The intermediate string tensions from this model are in rough agreement with the G(2) lattice results and the Casimir ratio. We argue that the SU(3) subgroup of G(2) may be responsible for the linear potential at the intermediate distances.
Confinement in G(2) Gauge Theories Using Thick Center Vortex Model and domain structures
Sedigheh Deldar,Hadi Lookzadeh,Seyed Mohsen Hosseini Nejad
Physics , 2011, DOI: 10.1103/PhysRevD.85.054501
Abstract: The thick center vortex model with the idea of using domain structures is used to calculate the potentials between two G(2) heavy sources in the fundamental, the adjoint and the 27 dimensional representations. The potentials are screened at large distances. This behavior is expected from the thick center vortex model since G(2) has only a trivial center element which makes no contribution to the average Wilson loop at the large distance regime. A linear potential is obtained at intermediate distances for all representations. This behavior can be explained by the thickness of the vortices (domains) and by defining a flux for the trivial center element of G(2). The role of the SU(3) subgroup of G(2) in the linear regime is also discussed. The string tensions are in rough agreement with the Casimir operators of the corresponding representations.
Colorful plane vortices and Chiral Symmetry Breaking in $SU(2)$ Lattice Gauge Theory
Seyed Mohsen Hosseini Nejad,Manfried Faber,Roman H?llwieser
Physics , 2015,
Abstract: We investigate plane vortices with color structure. The topological charge and gauge action of such colorful plane vortices are studied in the continuum and on the lattice. These configurations are vacuum to vacuum transitions changing the winding number between the two vacua, leading to a topological charge $Q=-1$ in the continuum. After growing temporal extent of these vortices, the lattice topological charge approaches $-1$ and the index theorem is fulfilled. We analyze the low lying modes of the overlap Dirac operator in the background of these colorful plane vortices and compare them with those of spherical vortices. They show characteristic properties for spontaneous chiral symmetry breaking.
Ecological Capability Assessment of Tabriz Suburb, Iran, for Urban Development using Multi Criteria Evaluation Approach. /Capacidad ecológica de los suburbios de la ciudad de Tabriz, Irán, para el desarrollo urbano utilizando la evaluación con criterios múltiples.
Hosseini, Seyed Mohsen,Monavvari, Seyed Masoud,Khorshiddoost, Ali Mohammad,Rostamzadeh, Hashem;
Revista de Urbanismo , 2009, DOI: doi: 10.5354/0717-5051.2009.14
Abstract: In order to achieve sustainable development, it is necessary to obtain and adopt planning procedures on the basis of Multi Criteria Evaluation of natural environment. Since biophysical (natural) environment has limited ecological capabilities for human use, ecological capability assessment, as an essence for environmental studies and with the aim of preventing existing crises, yields proper grounds for environmental planning. The analysis of land capability and sufficiency for urban development is one of the main categories with which urban planners deal. In this paper, by means of Weighted Linear Combination (WLC) through the perspective of Multi Criteria Evaluation (MCE) Approach and within Geographic Information Systems (GIS), ecological capability of the suburbs surrounding Tabriz city was assessed (natural and human in terms of 12 criteria) to examine physical development of Tabriz city and final mapping of the region was provided. This mapping shows regions suitable for physical urban development of the city. The results and finding of this research were applied by urban planners./Con el fin de lograr el desarrollo sostenible es necesario obtener y aprobar los procedimientos de planificación sobre la base de múltiples criterios de evaluación del medio ambiente natural. Desde lo biofísico (natural) el ambiente ha limitado las capacidades ecológicas para el uso humano; la evaluación de las capacidades ecológicas es la esencia de los estudios ambientales y su objetivo es prevenir las crisis actuales, mostrando los rendimientos adecuados para la planificación ambiental. El análisis de la suficiencia y la capacidad de la tierra para el desarrollo urbano es una de las categorías principales a considerar por los planificadores urbanos. En este documento, por medio de la Combinación Lineal Ponderada (WLC), a través de la perspectiva de Múltiples Criterios de Evaluación (MCE) y dentro de Enfoque de Sistemas de Información Geográfica (SIG), se evaluó la capacidad ecológica de los suburbios que rodean la ciudad de Tabriz (naturales y humanos en términos de 12 criterios) para examinar el desarrollo físico de la ciudad, proporcionando una cartografía que muestra regiones adecuadas para el desarrollo urbano de la ciudad. Los resultados y la búsqueda de esta investigación fueron aplicados por los planificadores urbanos.

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