نتایج جستجو برای: crafts
تعداد نتایج: 2058 فیلتر نتایج به سال:
Precious metals have held a status of their own ever since discovery. Their use has not only been an indication power, status, and luxury, but also example intricate craft skills exhibited by artisans worldwide. Gold silver, perhaps the oldest precious most popular had diverse in various fields, including textiles. The incorporation these textiles led to production plethora textile crafts, each...
A classical Friedel-Crafts alkylation of different indoles catalyzed by AlCl₃·6H₂O has been developed for a well-known important natural product, celastrol, resulting in a series of derivatives for further biological evaluation. The catalyst loading was reduced to 5 mol %, the reaction proceeds at ambient temperature and reaction time is only 3 h. The product yields range from 20% to 99%. A rea...
Lord Horder, in his address to the West London Medico-chirurgical Society in 1949, posed the question “Whither medicine?” and replied “Why, whither else but straight ahead, forging still more weapons with which to conquer disease, taking still more toll of science in the interest of humanity, adding more and more culture to more and more learning, improving both the art and the crafts. Medicine...
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