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Консультация № 196061
06.08.2019, 18:05
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2
1
Здравствуйте! Прошу помощи в следующем вопросе:
1. Между внутренней частью клетки и наружным раствором существует разность потенциалов (мембранный потенциал покоя) порядка U = 80 мВ. Полагая, что электрическое поле внутри мембраны однородно, и считая толщину мембраны l = 8 нм, найдите напряжённость этого поля.
1. Между внутренней частью клетки и наружным раствором существует разность потенциалов (мембранный потенциал покоя) порядка U = 80 мВ. Полагая, что электрическое поле внутри мембраны однородно, и считая толщину мембраны l = 8 нм, найдите напряжённость этого поля.
Обсуждение
08.08.2019, 15:56
общий
Адресаты:
С точки зрения физики можно рассматривать Мембрану клетки, как конденсатор с толстыми проводящими обкладками : внутренняя часть клетки и наружным раствор. Тонкая мембрана - диэлектрик.
Поскольку задано "электрическое поле внутри мембраны однородно", тогда напряжённость этого электрического поля легко подсчитать как
E = U / l = 0,08 / (8·10^(-9)) = 10·10^6 Вольт/м = 10 МегаВольт / м !
Однако, это - слишком большая величина! Она втрое превышает напряжение эл-пробоя в сухом воздухе Eпр = 30 кВ/см = 3 МВольт / м !
Вероятно, в условии задачи надо заменить U = 80 мВ на U = 80 мкВ ?
Поскольку задано "электрическое поле внутри мембраны однородно", тогда напряжённость этого электрического поля легко подсчитать как
E = U / l = 0,08 / (8·10^(-9)) = 10·10^6 Вольт/м = 10 МегаВольт / м !
Однако, это - слишком большая величина! Она втрое превышает напряжение эл-пробоя в сухом воздухе Eпр = 30 кВ/см = 3 МВольт / м !
Вероятно, в условии задачи надо заменить U = 80 мВ на U = 80 мкВ ?
09.08.2019, 06:40
общий
это ответ
Здравствуйте, dar777!
В соответствии с формулой (11.4) [1, с. 207] напряжённость поля внутри мембраны составляет
(В/м).
Литература
1. Лещенко В. Г., Ильич Г. К. Медицинская и биологическая физика. -- Минск: Новое знание, 2012. -- 552 с.
В соответствии с формулой (11.4) [1, с. 207] напряжённость поля внутри мембраны составляет
(В/м).Литература
1. Лещенко В. Г., Ильич Г. К. Медицинская и биологическая физика. -- Минск: Новое знание, 2012. -- 552 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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