An antibiotic preparation, originally thought to be an enzyme, obtained from cultures of the bacterium Pseudomonas aeruginosa and formerly used to…

A maroon crystalline compound, C8H8O4, with antibiotic activity, obtained synthetically and from Aspergillus fumigatus.

A pharmaceutical preparation originally marketed by the firm May and Baker, esp. M & B 693 n. the antibiotic sulphapyridine. Also, with…

Any of several polypeptides produced by Bacillus brevis which have antibiotic properties, esp. against Gram-positive bacteria, and are used…

(Any of) a group of crystalline monocyclic decapeptide antibiotics which along with the gramicidins are the active components of tyrothricin, as ty…

A preparation of gramicidin and tyrocidine which has antibiotic properties, esp. against Gram-positive bacteria, and has been used externally to…

A crystalline antibiotic substance produced in several fungi; spec. that obtained from Aspergillus clavatus.

(a) An antibiotic produced by the fungus Aspergillus fumigatus, now considered to be a mixture of the antibiotics helvolic acid and gliotoxin. (b) =…

Each of a group of related antibiotic but toxic compounds, C13H21N6O7(C6H12N2O)n, produced by the soil bacterium Actinomyces lavendulæ.

an acid derived from Aspergillus flavus and used as an antibiotic.

A name given to various antibiotic substances obtained from different species of Aspergillus.

= clavacin, n.

an antibiotic with the probable formula C32H42O8 produced by some strains of the fungus Aspergillus fumigatus. Also called fumigacin.

An antibiotic, C21H39N7O12, produced by the soil bacterium Streptomyces griseus, which was the first drug to be successful against tuberculosis but…

Any of a group of polypeptides with antibiotic activity isolated from cultures of Bacillus subtilis. Also with distinguishing letter.

An antibiotic obtained from organisms of the group Bacillus subtilis.

A crystalline antibiotic with antifungal properties, C20H16O6, derived from the mould Trichoderma viride.

A red, crystalline, bicyclic compound, C15H14O6, isolated from the fungus Fusarium javanicum and having antibacterial properties.

A mixture of closely related polypeptides, produced by the bacterium Streptococcus lactis, which is active against Gram-positive bacteria and is used…

A nitrofuran derivative with antibiotic activity, used chiefly as a topical antiseptic; 5-nitrofurfuraldehyde semicarbazone, C6H6N4O4.

A substance produced by strains of the soil bacterium Bacillus polymyxa, consisting of a mixture of closely related antibiotics; (more fully polymy…

Name of an antibiotic substance, chlortetracycline, derived from the mould Streptomyces aureofaciens, or produced artificially, and used in medical…

An antibiotic isolated from cultures of Streptomyces venezuelæ or prepared synthetically. Cf. Chloromycetin, n.

an antibiotic produced from a species of Clitocybe.

An aminoglycoside antibiotic which is produced by a strain of Streptomyces fradiae and is used in lotions and ointments to treat a wide variety of…

A proprietary name for oxytetracycline, n.

A bacteriostatic antibiotic, C25H43N13O10, produced by several species of bacterium which has been given as an alternative drug in the treatment…

Any of several antibiotic substances, closely related to penicillin, developed from Cephalosporium, a genus of fungi.

An unstable colourless crystalline compound, C26H34O7, which is produced by the growth of the fungus Aspergillus fumigatus and which has…

An antibiotic obtained from Streptomyces hygroscopicus that is an ionophore for monovalent cations and is used chiefly as an experimental tool.

The antibiotic puromycin. rare. Now disused.

A macrolide antibiotic obtained from the bacterium Streptomyces halstedii and now mainly used in experimental studies of protein synthesis.

An antibiotic isolated from Streptomyces erythreus.

An antibiotic produced by some species of Streptomyces, used in the treatment of fungal infections, esp. candidiasis.

The 5-hydroxy derivative of tetracycline, used as an antibiotic; C22H24N2O9

(a) A tetracyclic compound, C22H24N2O8, which is a broad-spectrum antibiotic (usually administered as the hydrochloride). (b) Any of a number of…

= aureomycin, n. (see quot. 1963).

A bicyclic nitrofuran derivative with broad-spectrum antibiotic activity, which is rapidly excreted by the kidneys after oral administration and is…

any of a group of antibiotics with anti-fungal activity, now used chiefly in the experimental inhibition of mitochondrial oxidative phosphorylation.

A substance with antibiotic activity which is produced by certain species of Streptomyces, used originally in the treatment of protozoal…

Any usually proteinaceous antibiotic produced by bacteria of one strain and active against those of another strain.

A substance originally isolated from the bacteria Actinomyces subtropicus which consists of a sulphur-containing nucleoside bound to a…

A mixture of macrolide antibiotics obtained from the fungus Streptomyces ambofaciens.

A dodecapeptide obtained from the fungus Streptomyces fulvissimus, which has antibiotic activity against Gram-positive bacteria and is used…

Either of two amphoteric polyenes with antifungal properties obtained from the soil bacterium Streptomyces nodosus; esp. the antibiotic C47H73NO17…

Any of a group of closely related antibiotics produced by the soil bacterium Streptomyces caespitosus; spec. (in full mitomycin C) the principal…

A weakly acidic tetracyclic phenol, C31H36N2O11, that is produced by certain actinomycetes of the genus Streptomyces and is used in treating…

A macrolide antibiotic, C35H61NO12, produced by a strain of the bacterium Streptomyces antibioticus, which is active against a wide range of…

A mixture of broad-spectrum aminoglycoside antibiotics related to neomycin and produced by some strains of the bacterium Streptomyces rimosus, given…

A glycopeptide antibiotic produced by the actinomycete Streptomyces orientalis and active against most Gram-positive bacteria.

(One of) a mixture of antibiotics, chemically related to neomycin, which are produced by the bacterium Streptomyces kanamyceticus and are…

Any of a class of antibiotics containing macrocyclic lactone rings. Also macrolide antibiotic.

An antibiotic structurally related to vancomycin, obtained from the fermentation products of the actinomycete Nocardia lurida and now used mainly…

Each of a group of related antibiotics produced by the bacterium Streptomyces spectabilis.

An antibiotic effective only against mycobacteria, used mainly (and now rarely) in the treatment of tuberculosis.

Any of a group of natural and semi-synthetic antibiotics originally isolated from the actinomycete Nocardia mediterranei, which inhibit microbial…

= streptomycin, n.

An antibiotic with antineoplastic activity which is produced by some species of Streptomyces, acts by inhibiting DNA transcription and…

The sodium salt of fusidic acid, used as an oral antibiotic esp. against staphylococci. Also used loosely for fusidic acid.

Any of various antimicrobial substances produced by the bacterium Streptomyces virginiae, used as antibiotics and as growth-promoting agents for…

An antibiotic, C16H16N2O6S2, derived from cephalosporin, given (usually by injection as the sodium salt) in the treatment of some bacterial…

a steroid, C31H48O6, with antibiotic properties, originally isolated from a strain of the fungus Fusidium coccineum and esp. effective against Staph…

A macrolide compound produced by Streptomyces griseus, C40H64O12, which has antibiotic activity but is used chiefly as an experimental ionophore.

An antibiotic, C14H18N4O3, that is usually given in conjunction with a sulphonamide, esp. in the treatment of malaria and of respiratory and urinary…

= daunorubicin, n.

An antibiotic, C18H34N2O6S, produced by cultures of the bacterium Streptomyces lincolnensis variant lincolnensis and given orally or by injection…

Any of a class of antineoplastic drugs whose molecules contain a tetracyclic nucleus related to anthraquinone and whose major action is to inhibit…

An antibiotic, C19H17N3O4S2, derived from cephalosporin which has been given (usually by injection) in the treatment of some bacterial infections.

An antimicrobial substance obtained from the fungus Streptomyces spectabilis and used esp. to treat gonorrhœa that is resistant to penicillin.

A broad-spectrum antibiotic, C22H24N2O8, of the tetracycline group which has a relatively long half-life in the body.

A semi-synthetic antibiotic of the rifamycin group, used esp. in the treatment of tuberculosis, leprosy, and other mycobacterial infections…

A semi-synthetic tetracycline derivative used (as the hydrochloride) as a broad-spectrum antibiotic and anti-inflammatory agent…

= rifampicin, n.

The antineoplastic drug doxorubicin.

An anthracycline antibiotic C27H29NO10, with antineoplastic activity, used against leukaemias, lymphomas, and some other cancers.

An aminoglycoside antibiotic originally obtained from the bacterium Streptomyces ribosidificus.

An anthracycline antibiotic, C27H29NO11, related to daunorubicin and used against leukaemia and other cancers.

An antibiotic related to streptomycin that is produced by the fungus Streptomyces tenebrarius and is active mainly against Gram-negative bacteria…

Any of a group of macrolide antibiotics structurally related to the avermectins, used in veterinary medicine for the treatment and prevention of…

Any of a group of synthetic antibiotics which are fluorinated quinolones, usually also containing a piperazine group, and which typically are well…