نتایج جستجو برای: silicon substitution
تعداد نتایج: 137468 فیلتر نتایج به سال:
A series of silole molecules with fluorenyl substituents at varying positions—1-(9,9-dimethylfluoren-2yl)-1,2,3,4,5-pentaphenylsilole, 1-(fluoren-9-yl)-1,2,3,4,5-pentaphenylsilole, 1,1,3,4-tetraphenyl-2, 5-bis(9,9-dimethylfluoren-2-yl)silole, and 1,1-diphenyl-2,3,4,5-tetrakis(9,9-dimethylfluoren-2yl)silole—has been synthesized and compared to the previously reported compounds, 1,1,2,3,4,5hexaph...
the water deficit is the most important limiting non-biological factor to achieve the potential yield of crops. to evaluate the effect of silicon application on yield of millet under drought stress in field an experimental was carried out. treatments were included three irrigation regimes after 60 (non-stress), 90 (moderate stress) and 120 (severe stress) mm evaporation from evaporation pan, cl...
Silicon has beneficial effects on growth, yield and improvement of the tolerance of some plants against biological and non-biological stresses. In order to study the effects of different concentrations of silicon (as Na2SiO3) on Iranian borage (Echium amoenum Fisch & C.A. mey), three levels of silicon (0, 0.2, 0.7 mM as Na2SiO3) and two levels of salinity (0 and 100 mM as NaCl) and two silicon-...
from the plants nutrition view point, silicon has not been recognized as an essential element but its useful effects on growth and development of many plants have been reported. in order to study the effect of application of different silicon on the yield component of wheat, an experiment was conducted in the city torbat heidarieh located in razavi khorasan province. the experiment was performe...
Skeletal diseases may be induced by malnutrition that involves certain nutrients, notably calcium, phosphorus, and vitamin D, but also iodine, copper, zinc, manganese, fluorine, silicon, vitamin A and perhaps vitamin C, as well as protein and energy. The number of these nutrients and their interactions is so large that dietary intervention in bone abnormalities is likely to be most effective if...
In searching for opportunities to exploit the benefits of silicon in TRPV1 research, we tried to investigate the pharmacological effects of sila-substitution (C/Si exchange) of tert-butyl group in the MK-056 series. Compound 13a, with a 4-positioned trimethylsilanyl group on the B ring in place of tert-butyl group, exhibited the most potent antagonist activity with IC(50) values of 0.15 microM,...
We have studied a range of pseudo-ternaries derived from the parent compound PrMn2 Ge 2, substituting for each constituent element with a smaller one to contract the lattice. This enables us to observe the magnetoelastic transitions that occur as the Mn-Mn nearest neighbour distance is reduced and to assess the role of Pr on the magnetism. Here, we report on the PrMn2 Ge 2−xSix, Pr1−xYxMn2 Ge 2...
A series of mesoporous silicas impregnated with nanocrystalline sulphated zirconia was prepared by a sol-gel process using an ionic liquid-templated route. The physicochemical properties of the mesoporous sulphated zirconia materials were studied using characterisation techniques such as inductively coupled optical emission spectroscopy, X-ray diffraction, transmission electron microscopy, ener...
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