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07.07.11

07.07.11 wallpapers, utorrent

07.07.11

07.07.11 Как сохранить молодость мозга По мнению исследователей из университета Тафтса, такие ягоды как земляника или голубика способны замедлить старение головного мозга и защитить его от вредного воздействия радиоактивного облучения. К таким выводам ученые пришли в результате длительных экспериментов с лабораторными крысами. В ходе исследования 60 молодых самцов крыс были разделены на три подгруппы, первая из которых получала обычный корм, а вторая и третья - корм, обогащенный экстрактами земляники и голубики. Спустя два месяца после начала кормления половина крыс из каждой группы была подвергнута радиоактивному облучению, что, по замыслу ученых, должно было ускорить процессы старения в мозге животных. Вторая половина грызунов облучению не подвергалась. После этого подопытных животных обучали передвигаться по подводному лабиринту, конфигурация которого менялась несколько раз в ходе обучения. В завершение исследования ученые измерили концентрации дофамина в тканях головного мозга крыс. Дофамин - вырабатываемый организмом нейромедиатор, от количества которого напрямую зависят такие характеристики как память, обучаемость и внимание. Самые низкие уровни дофамина были обнаружены у крыс, подвергавшихся облучению и не получавших экстрактов ягод. Эти животные также значительно хуже ориентировались в лабиринте. В то же время облученные крысы, получавшие экстракты обеих видов ягод, проходили через лабиринт не хуже, чем их не подвергавшиеся облучению собратья, а уровни дофамина в их головном мозге также соответствовали норме. По словам координатора исследовательского проекта Барбары Шукитт-Хэйл, в ходе эксперимента не было выявлено значительных различий в свойствах экстрактов голубики или земляники, хотя известно, что эти ягоды обладают различными составами питательных элементов и могут по-разному воздействовать на состояние головного мозга. Кроме того, исследователи не уверены, что результаты опытов с грызунами можно будет без изменений применить к людям. Источник: tv.ukr.net

07.07.11 backgrounds, utorrent


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