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Tốc độ hoạt động của CPU ảnh hưởng đến yếu tố nào sau đâyKích cỡ RAM (bộ nhớ trong) của máy tínhTuổi thọ của ổ cứng của máy tínhThời gian truy nhập để mở tập tin và khả năng tính toán của máy tínhKhả năng lưu trữ của máy tính
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- ABSORPTION et DISTRIBTION- Absorption intestinale du ROL.- Stockage hépatique sous forme de rétinyl-esters.- Prise en charge par la RBP plasmatique.- Libération dans le plasma du ROL selon besoins.PENETRATION CELLULAIRE- Liaison RBP-protéine membranaire (= Récepteur membranaire des cellules cibles)- Pénétration du ROL dans la cellule cible (prise en charge par la CRBP)- Transformation en RAL puis en AR qui passe dans le noyau.- Liaison de l’AR avec ses récepteurs nucléairesNB : 2 formes d'AR : - ATTR = Acide Tout Trans Rétinoïque - Acide 9-cis rétinoïqueACTION CELLULAIRE- Fixation de l’AR au récepteur par : - Liaison ionique entre le carboxylate (CO-) et NH3+ de l’Arg - Liaison hydrogène entre une N-alanine et une sérine - Interactions de type hydrophobe le long de chaîne carboné- Le complexe AR–Récepteur se lie à des séquences spécifiques de l'ADN (HRE : hormon responsive element), ce qui entraîne une modulation de l'expression de certains gènes (induction ou répression de ces gènes).