Русские видео

Сейчас в тренде

Иностранные видео


Скачать с ютуб Toxoid Vaccine 1955 в хорошем качестве

Toxoid Vaccine 1955 15 лет назад


Если кнопки скачивания не загрузились НАЖМИТЕ ЗДЕСЬ или обновите страницу
Если возникают проблемы со скачиванием, пожалуйста напишите в поддержку по адресу внизу страницы.
Спасибо за использование сервиса savevideohd.ru



Toxoid Vaccine 1955

For bacteria that secrete toxins, or harmful chemicals, a toxoid vaccine might be the answer. These vaccines are used when a bacterial toxin is the main cause of illness. Scientists have found that they can inactivate toxins by treating them with formalin, a solution of formaldehyde and sterilized water. Such detoxified toxins, called toxoids, are safe for use in vaccines. When the immune system receives a vaccine containing a harmless toxoid, it learns how to fight off the natural toxin. The immune system produces antibodies that lock onto and block the toxin. Vaccines against diphtheria and tetanus are examples of toxoid vaccines. For more information on vaccines, go to the website of the US National Institute of Allergy and Infectious Diseases (NIAID) at http://www3.niaid.nih.gov/topics/vacc... . This is clipped from the 1955 film Immunization (2nd Ed) produced by Encyclopedia Britannica Film and available at the Internet Archive.

Comments