نتایج جستجو برای: benzoxanthene
تعداد نتایج: 7 فیلتر نتایج به سال:
Fluorescent guest molecules doped in polymers have been used to convert ultraviolet light into visible light for applications ranging from optical fibres to filters for the cultivation of plants. The wavelength conversion process involves the absorption of light at short wavelengths followed by fluorescence emission at a longer wavelength. However, a precise understanding of the light conversio...
A new and efficient synthesis of benzoxanthene drivatives from the three-component condensation reaction ofaryl aldehydes and β-naphthol under solvent-free conditions in the presence of β-cyclodextrin sulfonic acid, as an efficient heterogeneous solid acid catalyst with excellent yields and short reaction time is presented
Tannins have received considerable attention from animal nutritionists as potential agents for modifying ruminal fermentation patterns, or for exploring new feed resources. This group of secondary plant compounds is defined by their ability to form complexes with proteins. A widely accepted method for assaying the biological activity of extracted tannins is the precipitation of bovine serum alb...
Benzo[kl]xanthene lignans, promising bioactive polyphenols obtained by biomimetic oxidative coupling of caffeic acid derivatives, react efficiently with peroxyl radicals in both polar and non-polar solvents, thanks to the simultaneous presence of guaiacol-like and catechol-like OH-groups.
نانوذرات دی اکسید قلع خالص و آلائیده شده با مقادیر مختلف نیکل بطور موفقیت آمیزی با استفاده از روش همرسوبی تهیه شدند. نمونه ها با روش های پیشرفته ای نظیر aas، xrd، ft-ir، tem، vsm و uv-vis مشخصه یابی شدند. نتایج xrd نشان می دهد همه نمونه ها دارای فاز خالص روتایل هستند و ناخالصی نیکل ساختار روتایل نانو ذرات دی اکسید قلع را تغییر نمی دهد، اما اندازه بلوری نانوذرات با افزایش غلظت نیکل از nm 31 به ...
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