this research was aimed to investgate the effect of light quality on micropropagation of pear rootstock oh×f333. first, single nodes explants were cultured in modified ql medium containing ba at four levels (0, 0.5, 1, and 2 mg/l-1) and iaa at three levels (0, 0.1, and 1 mg/l-1) and were evaluated for shoot proliferation. then, plantlets subcultured in modified ql medium containing 1 mg/l-1 ba ...

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 ...

introduction there are significant differences in the spatial distribution of the iran annual precipitation. this is resulted from spatial behavior of precipitation in the one hand and variation in the sources of precipitation on the other. the lack of adequate distribution of meteorological stations and the unavailability of long-term statistics of precipitation makes the analysis of precipita...

knowledge of environmental and ecological factors as well as growth and development pattern of fruit trees is an important task in orchard management and fruit industry. in addition, determination of growth pattern is an important aspect in the orchard management system. in this research, the total photosynthesis rate and growth pattern was measured in nine asian pear cultivars. experiment was ...

in this research, moisture sorptions of sayer date were determined at 20, 30, 40 and 60°c, using the standard static gravimetric method developed by the european cooperation project cost 90. several mathematical models, namely gab, bet, iglesias & chirif and halsey were employed to fit the experimental data through non-linear regression. results indicate that equilibrium moisture content increa...

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...

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 ...

A c l a s s o f c o u n t a n d t h r e s h o l d m e c h a n i s m s , c o l l e c t i v e l y d u b b e d α c o u n t , a b l e t o d i s c r i m i n a t e b e t w e e n t r a n s i e n t f a u l t s a n d i n t e r m i t t e n t f a u l t s i n c o m p u t i n g s y s t e m s i s p r e s e n t e d . T r a n s i e n t f a u l t s d i s c r i m i n a t i o n h a s l o n g b e e n p u r s u e d...

cict. o r M i n i n g t h n i n i t i a l c a n o n i c a l d a t a d e f i n i t i o n is d e s c r i b e d b y Ho I M I . T h i n o a p e r d e s c r i h e s t h e s u b s e q u e n t s t e p s w h i c h a r e m o r e f u l l y d e s c r i b e d b y P l o s s e r 13 1 . rilr PSl. M!)[»n. F Q P R F Q U I R E M F N T S S T A T E M E N T T h e R S I u n d e r c o n s i d e r a t i o n i r t h i ...

the purpose of this study was to examine the effectiveness of nanosilver colloid as a new antimicrobial agent against erwinia in tissue culture of sugar beet for the recovery of the contaminated doubled haploid plantlets. the nanosilver colloidal solution of 4000 ppm was diluted in different concentrations (0, 50, 75, 100 and 125 ppm) and was added to the solid ms medium. in a factorial experim...