introduction earth has ever been exposed to environmental hazards. the hazards are continually occurring in the world in the recent years. among them, atmospheric elements have created many human and financial losses in different regions. one of the hazards is dust events and in its severe case is dust storm. it happens more frequently in arid and semiarid regions in deserts and their surroundi...

application of various composts has been intensified in agriculture, due to manifestation of negative effects of chemical fertilizers on environment and soil fertility. however, their usage should be accompanied by environmental and nutritional studies. to study the effects of sulfur granular compost on yield and yield components of two wheat cultivars, a pot experiment was conducted in a compl...

abstract: the first period of abbasi dynasty is one of the glorious periods of islamic culture and civilization, which is known as the golden era of islamic culture and civilization. because in this era the power and riches of abbasi dynasty increased so high that led the islamic civilization grow in the various fields of science, literature and art especially music. while pretending as firm re...

E n e r g y i s t h e p r i m a r y a n d m o s t u n i v e r s a l m e a s u r e o f a l l k i n d s o f w o r k b y h u m a n b e i n g a n d n a t u r e . E v e r y t h i n g t h a t h a p p e n s i n t h e w o r l d i s t h e e x p r e s s i o n o f f l o w o f e n e r g y i n o n e o f i t s f o r m s . I f t h e q u e s t i o n i s a s k e d a s t o w h a t e n e r g y s o u r c e w i l l...

o b e c o m e f u l l y l i t e r a t e i n t o d a y ’ s world, students must become proficient i n t h e n e w l i t e r a c i e s o f 2 1 s t c e n t u ry technologies. As a result, literacy e d u c a t o r s h a v e a r e s p o n s i b i l i t y t o e f f e c tively integrate these new technologies i n t o t h e c u r r i c u l u m , p r e p a r i n g s t u d e n t s for...

in this study, precipitated calcium carbonate (pcc) was modified using cationic starch, and its effect on optical and physical properties of paper was examined in comparison with unmodified filler afterwards. to determine the filler retention in paper, both modified and unmodified fillers were added to pulp suspensions by 20, 30, and 40 percentages. for comparing the utilization effect of modif...

A r a b b i t l i v e r P 4 5 0 1 i k e p s e u d o g e n e h a s b e e n i s o l a t e d f rom a Z phage genomic l i b r a r y . Sequence a n a l y s i s r e v e a l e d s t r u c t u r a l homology w i t h r e s p e c t t o t h e r a t IX-450b and P--450e g e n e s as w e l l as a s i m i l a r i n t r o n e x o n o r g a n i z a t i o n . A 5 P p r o x i m a l TATA b o x l i k e s e q u e n ...

A s a r u l e , t h e w o r t h o f a s p e c i a l i s t b e c o m e s a p p r e h e n s i b l e t o a l l o n l y a f t e r h i s d e a t h , w h e n the a b s e n c e o f h i s p r o f e s s i o n a l k n o w l e d g e m a k e s i t s e l f f e l t . H o w e v e r , L á s z l ó P E L L É R D Y w a s one o f t he s c i e n t i s t w h o s e g r e a t n e s s w a s r e c o g n i z e d and a p ...

introduction numerous studies have demonstrated the relationship between the amount of co2 in the atmosphere and climate change. in this respect, developed countries have an undeniable role and cause serious damage to earth environment throughout the world. ipcc’ forth evaluation report implies that adding greenhouse gases to the atmosphere during recent decades prevents the heat rays to emit w...

rice (oryza sativa l.) is one of the iran's most strategic crops with water shortage as the most important abiotic stress limiting its yield. in the present research the effects of: variety, water regime, nitrogen (n) and phosphorus (p) levels on n, p and k uptake were studied under greenhouse conditions. the experiment design was a factorial one based upon a randomized complete blocks of ...