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Two structural features of β-lactam antibiotics have been correlated with their antibiotic potency. [16] The first is known as "Woodward's parameter", h , and is the height (in angstroms ) of the pyramid formed by the nitrogen atom of the β-lactam as the apex and the three adjacent carbon atoms as the base. [ 17 ]
An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting bacterial infections, and antibiotic medications are widely used in the treatment and prevention of such infections. [1] [2] They may either kill or inhibit the growth of bacteria.
[1] [9] The results of antimicrobial susceptibility tests performed during a given time period can be compiled, usually in the form of a table, to form an antibiogram. [31] [32] Antibiograms help the clinician to select the best empiric antimicrobial therapy based on the local resistance patterns until the laboratory test results are available ...
The two types of beta-lactamases work on the basis of the two basic mechanisms of opening the β-lactam ring. [2] The SBLs are similar in structure and mechanistically to the β-lactam target penicillin-binding proteins (PBPs) which are necessary for cell wall building and modifying. SBLs and PBPs both covalently change an active site serine ...
If these two drugs must be used concurrently, they must be given separately, with an interval of 8 to 12 hours between administrations. [ citation needed ] Rifampicin is easily absorbed from the gastrointestinal (GI) tract; its ester functional group is quickly hydrolyzed in bile , and it is catalyzed by a high pH and substrate-specific esterases .
Tetracyclines have a broad spectrum of antibiotic action. Originally, they possessed some level of bacteriostatic activity against almost all medically relevant aerobic and anaerobic bacterial genera, both Gram-positive and Gram-negative, with a few exceptions, such as Pseudomonas aeruginosa and Proteus spp., which display intrinsic resistance.
Piperacillin is a broad-spectrum β-lactam antibiotic of the ureidopenicillin class. [1] The chemical structure of piperacillin and other ureidopenicillins incorporates a polar side chain that enhances penetration into Gram-negative bacteria and reduces susceptibility to cleavage by Gram-negative beta lactamase enzymes.
Chloramphenicol is an antibiotic useful for the treatment of a number of bacterial infections. [5] This includes use as an eye ointment to treat conjunctivitis. [6] By mouth or by injection into a vein, it is used to treat meningitis, plague, cholera, and typhoid fever. [5]