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Консультация № 195808
05.06.2019, 10:01
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Здравствуйте! У меня возникли сложности с таким вопросом:
Бислойная липидная мембрана (БЛМ) толщиной 10 нм разделяет камеру на две части. Плотность потока метиленового синего через БЛМ постоянна и равна 3×10-4 (моль×см)/(c×л), причём концентрация его с одной стороны этой мембра-ны равна 10-2моль/л, а с другой 2×10-3моль/л. Чему равен коэффициент диффузии этого вещества через БЛМ?
Бислойная липидная мембрана (БЛМ) толщиной 10 нм разделяет камеру на две части. Плотность потока метиленового синего через БЛМ постоянна и равна 3×10-4 (моль×см)/(c×л), причём концентрация его с одной стороны этой мембра-ны равна 10-2моль/л, а с другой 2×10-3моль/л. Чему равен коэффициент диффузии этого вещества через БЛМ?
Обсуждение
06.06.2019, 09:47
общий
это ответ
Здравствуйте, Babklo!
В соответствии с пояснением к формуле (10.6) [1, с. 198], выражая в уравнении Фика градиент концентрации через толщину h мембраны и значения концентрации Ci и Ce вещества по обе её стороны, получим Ф=D/h*|Ci-Ce|, откуда для коэффициента диффузии будем иметь
Литература
1. Лещенко В. Г., Ильич Г. К. Медицинская и биологическая физика. -- Минск: Новое знание, 2012. -- 552 с.
В соответствии с пояснением к формуле (10.6) [1, с. 198], выражая в уравнении Фика градиент концентрации через толщину h мембраны и значения концентрации Ci и Ce вещества по обе её стороны, получим Ф=D/h*|Ci-Ce|, откуда для коэффициента диффузии будем иметь
D=hФ/|Ci-Ce|=10*10-9*3*10-5/((10-2)*10-6)=3,75*10-8 (м2/с).
Литература
1. Лещенко В. Г., Ильич Г. К. Медицинская и биологическая физика. -- Минск: Новое знание, 2012. -- 552 с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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