Final answer:
Narrow-spectrum penicillinase-resistant penicillins, such as methicillin, are antibiotics formulated to resist deactivation by the enzyme penicillinase, typically used against specific bacteria like penicillin-resistant Staphylococcus aureus.
Step-by-step explanation:
Narrow-spectrum penicillinase-resistant penicillins are antibiotics designed to be effective against organisms producing the enzyme penicillinase, which can inactivate some types of penicillin. Chemists have modified the structure of original penicillins to produce analogs like methicillin that are not deactivated by this enzyme. These penicillinase-resistant penicillins are a crucial tool in treating infections caused by penicillin-resistant strains of bacteria, particularly those strains of Staphylococcus aureus that produce penicillinase. However, penicillinase-resistant penicillins are narrow in their spectrum of activity and are usually chosen for their effectiveness against specific populations of bacteria, such as those causing infections like pneumonia or methicillin-resistant Staphylococcus aureus (MRSA).
Narrow-spectrum penicillinase-resistant penicillins are a specific type of penicillin that is effective against certain types of bacteria. These penicillins have a limited range of activity, targeting mostly gram-positive bacteria and some gram-negative bacteria. Examples of narrow-spectrum penicillinase-resistant penicillins include methicillin and oxacillin.