TY - BOOK AU - Mona Tawifk Kashif AU - Alaa Eldien Mahmoud Shawky Hosny , AU - Aymen Samir Yassin , AU - Lamiaa Ezzat , TI - A study on AmpC Ý - lactamases in gram negative bacteria / PY - 2012/// CY - Cairo : PB - Mona Tawifk Kashif , KW - AmpC disc test KW - AmpC Ý - lactamases KW - Cloxacillin N1 - Thesis (Ph.D.) - Cairo University - Faculty of Pharmacy - Department of Microbiology and Immunology; Issued also as CD N2 - AmpC enzyme is a Ý - lactamase enzyme that can hydrolyze all Ý - lactam antibiotics expcept cefipime and carbapenem and is not inhibited by clavulanic acid . In gram negative bacteria , this enzyme is chromosomally mediated in most isolates and less commonly plasmid mediated in only few isolates . There is no standard phenotypic method for detection of such enzyme ER -