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Chapter 20
Antimicrobial drugs
34
Biology
Undergraduate 2
07/08/2008

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Term

What is chemotherapy?

Definition
The use of drugs to treat a disease
Term

Interferes with the growth of microbes

Definition

Antimicrobial drugs

Term

A substance produced by a microbe that in small amounts, inhibits another microbe

Definition
antibiotics
Term
A drug that kills harmful microbes without damaging the host
Definition
selective toxicity
Term

Who discovered penicillin which is produced by penicillium

Definition
Alexander Flemming
Term
What 2 people performed the first clinicial trials of penicillin?
Definition

1) Howard Florey

2) Emst Chain

Term
What are the 5 actions of antimicrobrial drugs within a cell?
Definition
  1. Inhibit cell wall synthesis
  2. inhibit protein synthesis
  3. injury to plasma membrane
  4. inhibit of synthesis of essential metabolism
  5. inhibit nucleic acid, replication, transcription
Term
What antimicrobrial drug binds to 50s portion and inhibits formation of peptide bond?
Definition
chloramphenicol
Term
What antimicrobial drug changes shape of 30s portion causes code on mRNA to be read incorrectly
Definition
streptomycin
Term
What antimicrobial drug interferes with the attachment of tRNA to mRNA-ribosome complex
Definition
tetricyclines
Term

What are two types of Penicillin?

Definition
  • Natural penicillins
  • Semisynthetic penicillin
Term

2nd, 3rd, 4th generations are more effective against gram-negatives

Definition
cephalosporin
Term

What are 2 polypeptide antibiotics?

Definition

bacitracin

vancomycin

Term
  • Topical application
  • against gram positives
Definition

Bacitracin

Term
What are 2 natural penicillin?
Definition
  • Penicillin G - requires injection
  • Penicillin Y - can be taken orally
Term
  • Glycopeptide
  • important "last line" against antibiotic resistant
  • S. Aureaus
Definition

Vancomycin

Term
What are 2 antimycobacterial antibiotics?
Definition
  • isoniazid (INH) - inhibits mycolic acid synthesis
  • Ethambutol - inhibits incorporation of mycolic acid
Term

What are some antibacterial antibiotics that inhibit cell wall synthesis?

Definition
  • Penicillin
  • Cephalosporins
  • Bacitracin
  • Vancomycin
  • Isoniazid
  • ethambutol
Term

Inhibits protein synthesis

Broad spectrum - binds 50 s subunit, inhibits peptide bond formation

Definition
Chloramphenicol
Term

Inhibits protein synthesis

streptomycin, neomycin, gentamycin

broad spectrum - changes shape of 30S subunit

Definition

Aminoglycosides

Term

Inhibits Protein Synthesis

Broad spectrum - interferes with tRNA attachment

Definition
Tetracyclines
Term
  • Inhibits protein synthesis
  • Gram positives
  • Binds 50S subunit
  • inhibits translation
Definition
Streptogramins
Term
  • Inhibits protein synthesis
  • gram positives
  • binds 50S
  • prevents translocation
Definition
macrolides
Term
  • Inhibits protein synthesis
  • Linezolid
  • Binds 50S subunit prevents formation of 70s ribosome
Definition
Oxazolidinones
Term
Name antibacterial antibiotics that inhibit protein synthesis
Definition
  • Chloramphenicol
  • aminoglycosides
  • tetracyclines
  • streptogramins
  • macrolides
  • oxazolidinones
Term
  • injures plasma membrane
  • Topical
  • Combined w/ bacitracin + neomycin in over the counter preperation
  • 3rd componant in a triple antibiotic ointment
Definition
Polymyxin B
Term
  • Inhibits nucleic acid synthesis
  • inhibits RNA synthesis
  • Antituberculosis
Definition
Rifamycin
Term

Inhibits nucleic acid synthesis

Definition

ciproflaxacin

inhibits DNA gyrase

Urinary tract infections

Term
  • A competitive inhibitor
  • inhibits folic acid synthesis
  • broad spectrum
Definition
Sulfonamides (sulfa drugs)
Term
Broad spectrum
Definition

antibimicrobial drug that effects a broad range of gram + and gram - bacteria.

Term

What is a superinfection?

Definition
It is a growth of a target pathogen that becomes resistant to antibiotics so infection continues
Term
What is bacteriocidal?
Definition

They kill microbes directly

Term
What is bacteriostatic?
Definition
Inhibits the growth of microbes
Term

what are 2 aminoglycosides?

Definition
streptomycin, neomycin, gentamycin
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