stevia rebaudiana bertoni is a medicinal, perennial and herbaceous plant from asteraceae family with sweet glycosides in its leaves. salinity stress is one of the important limiters in agricultural productions. salinity influences the growth and development of plant by effect on more activities in physiological and morphological characteristics. to study the effect of salinity on morphological ...

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 research, temporal and spatial behavior of siberian high (sh) was studied at the level of 1000 h.pa. this study has been done using daily data of geo potential height at 12 gmt in ncep/ncar database with spatial resolution of 2.5ã—2.5 degree in a 55 years period including 20089 days from january, 1st, 1951(dey, 11th, 1329) to december, 31st,2005(dey, 10th,1384). at first, the mean geo p...

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the aim of this study was to investigate the relationships between air, noise, light and landscape pollution on job stress of staff work in high schools of different districts (1, 2, 10 and 11) of tehran. this stress can reduce the efficiency of the personnel. the number of people participated in this research was 250, selected by random from different schools of the districts. the questionnair...

the abscission of alstroemeria petals is the serious problem at the industry of cut flowers of this plant. in this study, cut alstroemeria cv. bridal flowers were pulsed with solutions containing natural essential oil carvacrol, gibberellic acid and benzyladenine (50 and 100 mg l-1), -5-sulfosalicylic acid (1 and 1.5 mm) and sucrose (5 and 10%) for 24 hours. the distilled water was used as cont...

most essential oil extraction from medicine plant have shown the properties of antimicrobial of parasites, bacteria, fungi and viruses. the fungus from genus of fusarium is one of the prevalent crop disease that infect a wide range of crops. fusarium solani is one of the species of this fungus genus that various crops are host for it. a lab experiment was conducted to investigate the effect of ...

background and objectives: the region of the experiment is located in golestan province, iran, with agriculture subject to various farming conditions (rain-fed and irrigation) and different levels of salinity (more than 38% of golestan’s total land area is salt-affected). the purpose of this study has been to evaluate the stress indices in the selection of tolerant wheat genotypes, not only for...

abstract introduction: the mineral content of dentin increases with age and its primary structure is altered. these changes may have unknown effects on efficiency of adhesive systems. the aim of this study was to find the effect of aging on dentin bonding agents. methods and materials: fourty eight extracted human premolars were divided into 2 groups under 15 years old & 2 groups over 45 years ...

in this paper detection of endoglucanase gene and protein profile belonging to two fungal species, penicillium oxalicum 1sms and trichodermaviride156ms with high cellulotic activity was investigated. fungi isolates were cultured on inducer cmc medium and then released sugar and protein were assayed every three days for a month using arsenate molybdate reagent and bradford method, respectively. ...