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Gram-negative bacteria that attempt to grow and divide in the presence of penicillin fail to do so, and instead end up shedding their cell walls. [53] Penicillin and other β-lactam antibiotics act by inhibiting penicillin-binding proteins , which normally catalyze cross-linking of bacterial cell walls.
Gentamicin is a type of aminoglycoside [5] and works by disrupting the ability of the bacteria to make proteins, which typically kills the bacteria. [ 5 ] Gentamicin is naturally produced by the bacterium Micromonospora purpurea , [ 9 ] [ 5 ] was patented in 1962, approved for medical use in 1964. [ 10 ]
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]
A colored electron microscopy image of methicillin-resistant staphylococcus aureus (), a bacterium commonly targeted by broad-spectrum antibioticsA broad-spectrum antibiotic is an antibiotic that acts on the two major bacterial groups, Gram-positive and Gram-negative, [1] or any antibiotic that acts against a wide range of disease-causing bacteria. [2]
Staphylococcus aureus is a gram-positive spherically shaped bacterium, a member of the Bacillota, and is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. It is often positive for catalase and nitrate reduction and is a facultative anaerobe, meaning that it can grow without oxygen. [1]
It is effective against certain gram positive bacteria, gram-negative bacteria, and anaerobes. [2] Gram-positive bacteria: Staphylococcus aureus (beta-lactamase and non-beta-lactamase producing), Staphylococcus epidermidis (beta-lactamase and non-beta-lactamase producing), Staphylococcus saprophyticus (beta-lactamase and non-beta-lactamase ...
Successive generations of cephalosporins have increased activity against Gram-negative bacteria, albeit often with reduced activity against Gram-positive organisms. [citation needed] The antibiotic may be used for patients who are allergic to penicillin due to the different β-lactam antibiotic structure. The drug is able to be excreted in the ...
Ampicillin is used to treat infections by many gram-positive and gram-negative bacteria. It was the first "broad spectrum" penicillin with activity against gram-positive bacteria, including Streptococcus pneumoniae , Streptococcus pyogenes , some isolates of Staphylococcus aureus (but not penicillin-resistant or methicillin-resistant strains ...