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Antimicrobial Therapy
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26
Microbiology
Undergraduate 3
04/22/2010

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Term
Antibiotic
Definition
a chemical substance produced by microorganisms which has the capacity to inhibit the growth o bacteria.
Term
chemotherapeutic agent
Definition
any chemical substance used in medical practice.
Term
anti-microbial agents
Definition
a special group of chemotherapeutic agents used to treat diseases caused by microbes.
Term
selective toxicity
Definition
an antimicrobial agent's ability to cause harm to microbes without significant harm to host.
Term
therapeutic dosage
Definition
the amount of an antibiotic that successfully eliminates a pathogenic organism over time.
Term
chemotherapeutic index
Definition
the maximum tolerable dose per kilogram of body weight, divided by the minimum dose per kilogram of body weight.
Term
Broad Spectrum Antibiotics
Definition
Penicillins, Tetracyclines, Ampicillin, Cephalosporins, Chloramphenicol,
Term
Narrow Spectrum antibiotics
Definition
Nystatin, Polymyxins, Erythromycin, Streptomycin,
Term
5 modes of antibiotic action on microbes
Definition
1. inhibition of cell wall synthesis
2. disruption of cell membrane function
3. inhibition of protein synthesis
4. inhibition of mucleic acid synthesis
5. action as antimetabolites
Term
name of the structure found in Penicillin and Cephalosprorin that can interfere with the cross-links of peptidoglycan in cell wall.
Definition
b-lactam ring
Term
Anti-metabolite
Definition
a substance that affects the utilization of intermediate compounds within a metabolic pathway.
Term
sulfanilamide
Definition
antibiotic agent that competitively inhibits an enzyme that acts on PABA, which is needed for folic acid synthesis.
Term
superinfection
Definition
an invasion of microbes that are not indigenous to the body system.
Term
5 Mechanisms of antibiotic resistance
Definition
1. Alteration of Targets(ribsomes)
2. Alteration of Membrane permeability
3. Development of new enzymes
4. Alteration of an existing enzyme
5. Alteration of a Metabolic Path
Term
Cross resistance
Definition
resistance to two or more similar antimicrobial agents via a common mechanism.
Term
Kirby-Bauer method
Definition
a method of determining which antibiotic is effective at killing a specific microbe.
Term
dilution method
Definition
a testing method used to determine the minimal level of diluted antibiotic that is effective.
Term
8 characteristics of an ideal antimicrobial agent
Definition
1. must be soluble in fluid
2. must have selective toxicity
3. toxicity must not be easily altered
4. must be non-allergenic
5. must be maintain stablility in tissues
6. resistance must not be easily aquired
7. must have long shelf life
8. must be reasonably priced
Term
Inhibitors of Cell Wall Synthesis
Definition
Penicillins
Cephalosporins
Carbapenems
Term
Disrupters of Cell Membrane Function
Definition
Polymyxins
Term
Inhibitors of Protein Synthesis
Definition
Aminoglycosides
Tetracyclines
Chloramphenicols
Macrolides (Erythromycin)
Lincosamides
Term
Inhibitors of Nucleic Acid Synthesis
Definition
Rifampin
Quinolones
Term
Anti-Metabolites
Definition
Sulfonamides
Isoniazids
Ethambutol
Nitrofurans
Term
Antifungal Agents
Definition
Imidazoles
Polyenes (Nystatin,Amphotericin B)
Griseofulvin
Tinactin
Lamisil
Term
Anti-Viral Agents
Definition
Ribavirin (Influenza virus)
Zidovudine (AIDS Treatment)
Amantadine (Influenza A)
Interferons
Term
Anti-Protazoan Agents
Definition
Quinine (cinchona tree)
Chloroquine (malaria)
Primaquine (malaria)
Metronidazole
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