1. 
   beta-Lactamase
   Ampicillin resistance gene. (See Selectable marker.)
   Found op http://filebox.vt.edu/cals/cses/chagedor/glossary.html
   
   
2. 
   beta-lactamase
   (= b-lactamase) Specifically, the plasmid-coded enzyme secreted by many bacteria that inactivates penicillins by opening the lactam ring.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   beta-lactamase
   <enzyme> An enzyme produced by some bacteria, which causes the breakdown of the active form of some penicillin antibiotics, rendering them ineffective. It causes the hydrolysis of a beta-lactam (as penicillin to penicilloic acid); found in most strains of staphylococcus bacteria that are natur...
   Found op http://www.mondofacto.com/facts/dictionary?beta-lactamase
   
   
4. 
   Beta-lactamase
   Beta-lactamases are enzymes ({EC number|3.5.2.6}) produced by some bacteria and are responsible for their resistance to beta-lactam antibiotics like penicillins, cephamycins, and carbapenems (ertapenem) (Cephalosporins are relatively resistant to beta-lactamase). These antibiotics have a common ele...
   Found op http://en.wikipedia.org/wiki/Beta-lactamase
   
   

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