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  2. Penicillin - Wikipedia

    en.wikipedia.org/wiki/Penicillin

    Penicillin molecules are small enough to pass through the spaces of glycoproteins in the cell wall. For this reason Gram-positive bacteria are very susceptible to penicillin (as first evidenced by the discovery of penicillin in 1928 [46]). [47] Penicillin, or any other molecule, enters Gram-negative bacteria in a different manner. The bacteria ...

  3. β-Lactam antibiotic - Wikipedia

    en.wikipedia.org/wiki/Β-Lactam_antibiotic

    β-Lactam antibiotics are indicated for the prevention and treatment of bacterial infections caused by susceptible organisms. At first, β-lactam antibiotics were mainly active only against gram-positive bacteria, yet the recent development of broad-spectrum β-lactam antibiotics active against various gram-negative organisms has increased their usefulness.

  4. Discovery and development of cephalosporins - Wikipedia

    en.wikipedia.org/wiki/Discovery_and_development...

    The cephalosporins (and other β-lactams) have the ability to kill bacteria by inhibiting essential steps in the bacterial cell wall synthesis which in the end results in osmotic lysis and death of the bacterial cell. [2] Cephalosporins are widely used antibiotics because of their clinical efficiency and desirable safety profile. [3]

  5. Beta-lactamase - Wikipedia

    en.wikipedia.org/wiki/Beta-lactamase

    Escherichia coli bacteria on the right are sensitive to two beta-lactam antibiotics, and do not grow in the semi-circular regions surrounding antibiotics. E. coli bacteria on the left are resistant to beta-lactam antibiotics, and grow next to one antibiotic (bottom) and are less inhibited by another antibiotic (top).

  6. Discovery of penicillin - Wikipedia

    en.wikipedia.org/wiki/Discovery_of_penicillin

    After testing against different bacteria, he found that the mould could kill only specific, Gram-positive bacteria. [11] For example, staphylococcus , streptococcus , and diphtheria bacillus ( Corynebacterium diphtheriae ) were easily killed; but there was no effect on typhoid bacterium ( Salmonella typhimurium ) and a bacterium once thought to ...

  7. Bactericide - Wikipedia

    en.wikipedia.org/wiki/Bactericide

    A bactericide or bacteriocide, sometimes abbreviated Bcidal, is a substance which kills bacteria. Bactericides are disinfectants, antiseptics, or antibiotics. [1] However, material surfaces can also have bactericidal properties based solely on their physical surface structure, as for example biomaterials like insect wings.

  8. Antimicrobial spectrum - Wikipedia

    en.wikipedia.org/wiki/Antimicrobial_spectrum

    Detailedly, broad-spectrum antibiotics can kill or inhibit a wide range of microorganisms; extended-spectrum antibiotic can kill or inhibit Gram positive bacteria and some Gram negative bacteria; narrow-spectrum antibiotic can only kill or inhibit limited species of bacteria. [1] [2] [3]

  9. Ampicillin - Wikipedia

    en.wikipedia.org/wiki/Ampicillin

    Ampicillin is in the penicillin group of beta-lactam antibiotics and is part of the aminopenicillin family. It is roughly equivalent to amoxicillin in terms of activity. [7] Ampicillin is able to penetrate gram-positive and some gram-negative bacteria. It differs from penicillin G, or benzylpenicillin, only by the presence of an amino group.

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