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Hybrid Particles from Polysaccharides and Synthetic Polymers. Synthesis and Characterization

Формат:      Страниц 72
     мягкая обложка
Alliny N.    
Книга по Требованию    
2008 руб
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The colloidal stability was attributed to the presence of a hydrated CMC layer around the particles. This work reports the formation of complexes between polyelectrolytes and oppositely charged surfactants solutions, and a new procedure to synthesize stable polymeric particles, where the polymerization takes place in the complex. The mixtures behavior between carboxymethylcellulose (CMC) and cetyltrimethylammonium bromide (CTAB), and between chitosan (CH) and sodium dodecyl sulfate (SDS) was investigated in the diluted range at the liquid-air interface by means of surface tension, and in the bulk solution by turbidity and conductivity measurements. The present procedure brings the advantage of synthesizing and stabilizing particles with functional groups on the surface in a one-step method using very small amounts of surfactant, a friendly condition for the environment. The hybrid particles were characterized by zeta potential, light scattering measurements and scanning electron microscopy. The synthesis of polystyrene or poly(methyl methacrylate) was carried out by emulsion polymerization in the critical aggregation concentration (cac) of the CMC/CTAB system.
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Грегор Мендель
Закон независимого расщепления признаков, известный теперь как закон Менделя, положил начало новому направлению в биологии – менделизму, ставшему фундаментом генетики. Сам Мендель, после неудачных попыток получить аналогичные результаты при скрещивании других растений, прекратил свои опыты. До конца жизни он занимался пчеловодством, садоводством, вел метеорологические наблюдения. Умер Мендель 6 января 1884. Среди трудов ученого – Автобиография (Gregorii Me del au obiographia iuve ilis, 1850) и ряд статей, включая Эксперименты по гибридизации растений (Versuche ber Pfla ze hybride , в «Трудах Брюннского общества естествоиспытателей», т. 4, 1866). Список литературы Мендель Г. Опыты над растительными гибридами. М., 1965 Тимофеев-Ресовский Н.В. О Менделе. – Бюллетень Московского общества испытателей природы, 1965, №4 Мендель Г., Ноден Ш., Сажрэ О. Избранные работы. М., 1968

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