global warming and climate change have drawn special attention to soil and its potential for stable carbon sequestration. soils are the largest stores of carbon in terrestrial carbon cycle and contain about three times more carbon than vegetation cover and two times more than that of atmosphere. studying the effects of grazing on soil carbon storage is important because of the major role soil o...

in this report, synthesis, characterization and application of silica perchloric acid nanosphere as a novel and heterogeneous catalyst is described. these nanospheres have been characterized by xrd, ft-ir, bet and tga spectra and also by sem and tem images. the results show that it has a spherical shape and the particles size are between 75 and 100 nm. the catalytic activity has been investigat...

background and purpose: recent reports suggest that increased homocysteine is a risk factor for heart disease. on the other hand, regular exercise and supplementation of omega-3 fatty acids have been effective in reducing these diseases. the purpose of this study was to evaluate the interaction effect of 8 weeks of aerobic training and omega-3 fatty acid supplementation on plasma homocysteine c...

many of the meteorological variables such as precipitation, strongly depend on the large scale atmospheric and ocean surface circulations.in the current study, the effect of climatic signals on the average monthly rainfall of the adjacent stations of sheshdeh and gharebolagh area was investigated during the statistical period twenty five years from 1985 to 2009. the regression and neural networ...

background: a soluble form of her-2/neu extracellular domain (sher-2) is reported to be released in the sera of metastatic breast cancer patients. objective: to measure the level of sher-2 in sera of 115 breast cancer patients. methods: serial samples of 27 patients with metastasis, 18 non-metastatic patients, 15 patients in stage 0/i and 14 patients with accompanying benign breast disease were...

introduction: cardiovascular disease is the major cause of morbidity and mortality in developing and developed countries. rapid diagnosis of the thrombosis can be an essential step in management of the stroke. methods: in this work a recently developed radiolabeled streptokinase (stp) tracer was evaluated in an animal thrombotic model using spect imaging and biodistribution studies. locally lab...

inrtoduction developing countries and newly industrialized countries face the twin challenges of protecting the environment while also strengthening their economies. over the past few decades, the intensified process of urbanization and industrialization undertaken by these countries, coupled with rapid population growth, has resulted in the degradation of the environmental quality. particularl...

extended abstract   introduction the most important indicator of climate in a region is vegetation community. climate can be different over large areas, because of changes in vegetation community. vegetation influences weather and climate in its surrounding areas mostly by way of evapotranspiration and albedo so they play a role in the earth’s energy balance. these effects on the earth’s energy...

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modernity and its impacts on urbanism and the change of the concept and the nature of the city which began in qajar era, stands in a sensitive level in pahlavi’s government (1920-1940). in this stage the concept of modernism can be seen as a pattern in cities (tehran in particular) which affects all economic, social, cultural, physical, management and urban planning aspects s. the main question...