أرسل هذا في رسالة قصيرة: Characterization of chitosan and carboxymethyl chitosan films from various sources and molecular sizes

 _____      _____               _____    __   __  
|  __ \\   |  ___||   ____     |  ___||  \ \\/ // 
| |  \ ||  | ||__    |    \\   | ||__     \   //  
| |__/ ||  | ||__    | [] ||   | ||__     / . \\  
|_____//   |_____||  |  __//   |_____||  /_//\_\\ 
 -----`    `-----`   |_|`-`    `-----`   `-`  --` 
                     `-`