Antibiotic | Definition, Types, Side Effects, Resistance ...
2024年11月12日 · Antibiotic, chemical substance produced by a living organism, generally a microorganism, that is detrimental to other microorganisms. Antibiotics came into worldwide prominence with the introduction of penicillin in 1941. Since then they have revolutionized the treatment of bacterial infections.
Structure, applications, and drawbacks of antibiotics | Britannica
Antibiotics may be broad-spectrum (active against a wide range of pathogens) or specific (active against one, or one class). Drawbacks include activity against beneficial microorganisms, often causing diarrhea; allergies; and development of drug-resistant strains of the targeted microorganisms.
antibiotic resistance - Encyclopedia Britannica
3 天之前 · antibiotic resistance, loss of susceptibility of bacteria to the killing (bacteriocidal) or growth-inhibiting (bacteriostatic) properties of an antibiotic agent. When a resistant strain of bacteria is the dominant strain in an infection, the infection …
Antibiotic - Wikipedia
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.
antibiotic - Students | Britannica Kids | Homework Help
An antibiotic acts by limiting or stopping (and therefore killing) the growth of a specific microorganism. It probably accomplishes this by interfering with the wall of the bacteria cell at which it is targeted while at the same time having little effect on the body’s normal cells.
antibiotic - Kids | Britannica Kids | Homework Help
Antibiotics treat illnesses and infections caused by bacteria, or tiny organisms. The first widely used antibiotic was penicillin. It was discovered in 1928. Doctors use antibiotics to cure serious diseases such as pneumonia, tuberculosis, and meningitis. Antibiotics can also fight common problems such as acne and strep throat.
Antibiotics 101: Common Names, Types & Their Uses - Drugs.com
Antibiotics specifically treat infections caused by bacteria, such as Staph., Strep., or E. coli., and either kill the bacteria (bactericidal) or keep it from reproducing and growing (bacteriostatic). And remember, antibiotics do not work against viral infections, like a cold, most coughs or COVID. When should I use an antibiotic?
penicillin - Kids | Britannica Kids | Homework Help
Penicillin belongs to a group of medical drugs called antibiotics. These medicines fight infections caused by small living things called bacteria. Infectious diseases once caused many deaths. The discovery of penicillin therefore saved millions of lives. In 1928 a Scottish doctor named Alexander Fleming discovered the effects of penicillin.
Antibiotic - Resistance, Bacteria, Drugs | Britannica
2024年11月12日 · Each type of antibiotic has a specific application in medicine and can serve as a useful model for exploring the various mechanisms by which antibiotics exert their effects. The following sections focus on the penicillins and cephalosporins, imipenem, the antituberculosis antibiotics, and the agents aztreonam, bacitracin, and vancomycin.
A brief history of antibiotics and select advances in their synthesis ...
2017年7月5日 · The advent of modern antibiotics contributed enormously to the dramatic extension of human lifespan since their discovery by virtue of their lethal and selective action against pathogenic...