Abstract: 23-De(mycinosyloxy)tylosin (DMOT) which has the formula: ##STR1## 20-dihydro-DMOT, specified acyl ester derivatives, and the acid addition salts thereof are useful antibacterial agents. New methods of making 23-deoxy-5-O-mycaminosyltylonolide (DOMT) and 20-dihydro-DOMT by mild acid hydrolysis of DMOT and 20-dihydro-DMOT, respectively, are included.

Abstract: Method and compositions for treatment of swine dysentery with antibiotic A-32887 (K-41). Antibiotic A-32887 is produced by submerged aerobic fermentation of Streptomyces albus NRRL 11109.

Abstract: Antibiotic A-21978 complexes, in particular the A-21978C complex, comprising microbiologically active, related factors, C.sub.0, C.sub.1, C.sub.2, C.sub.3, C.sub.4, and C.sub.5. A-21978 complex and A-21978C complex are produced by submerged aerobic fermentation of Streptomyces roseosporus NRRL 11379. The individual A-29178C factors are separated and isolated by chromatography. The A-21978 and A-21978C complexes, the A-21978C factors, and pharmaceutically acceptable salts thereof are antibacterial agents and improve growth promotion in poultry.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is C.sub.6 -C.sub.24 alkyl or C.sub.6 -C.sub.24 alkenyl, have antifungal activity.

Abstract: A method of providing maximum frequencies of transduction with Escherichia coli strains, such as E. coli K12 .chi.1776, that are transduced poorly in the exponential growth phase, which comprises transducing the culture in the stationary phase of growth. E. coli K12 .chi.1776 strains modified by transduction using this method are useful as EK2 hosts for biological containment.

Abstract: 23-De(mycinosyloxy)tylosin (DMOT) which has the formula: ##STR1## 20-dihydro-DMOT, specified acyl ester derivatives, and the acid addition salts thereof are useful antibacterial agents. New methods of making 23-deoxy-5-O-my-caminosyltylonolide (DOMT) and 20-dihydro-DOMT by mild acid hydrolysis of DMOT and 20-dihydro-DMOT, respectively, are included.

Abstract: 23-Demycinosyltylosin (DMT) which has the formula: ##STR1## 20-dihydro-DMT, specified acyl ester derivatives, and their acid addition salts are useful antibacterial agents. Improved methods of making 5-O-mycaminosyltylonolide (OMT) and 20-dihydro-OMT by mild acid hydrolysis of DMT and 20-dihydro-DMT, respectively, are included.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is C.sub.6 -C.sub.24 alkyl or C.sub.6 -C.sub.24 alkenyl, have antifungal activity.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is C.sub.6 -C.sub.24 alkyl or C.sub.6 -C.sub.24 alkenyl, have antifungal activity.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is C.sub.6 -C.sub.24 alkyl or C.sub.6 -C.sub.24 alkenyl and R.sup.2 is C.sub.1 -C.sub.6 alkyl, have antifungal activity.

Abstract: S 31794/F-1 nucleus, which is prepared by enzymatic deacylation of antibiotic S 31794/F-1 using an enzyme produced by the Actinoplanaceae, preferably by Actinoplanes utahensis. S 31794/F-1 nucleus and salts thereof are useful intermediates for the preparation of new semi-synthetic antifungal agents.

Abstract: 20-Dihydro-20-deoxy-23-demycinosyltylosin (DH-DO-DMT), 20-dihydro-20-deoxy-5-O-mycaminosyltylonolide (DH-DO-OMT), specified acyl ester derivatives, and their acid addition salts are useful intermediates and antibacterial agents. Methods of preparing DH-DO-DMT and DH-DO-OMT by fermentation of Streptomyces fradiae and the microorganism S. fradiae ATCC 31733 are included.

Abstract: Methods and compositions for treatment of coccidiosis in poultry with antibiotic A-32887 (K-41). Antibiotic A-32887 is produced by submerged aerobic fermentation of Streptomyces albus NRRL 11109.

Abstract: Mycarosyltylactone (5-O-mycarosyl-20-dihydro-20,23-dideoxytylonolide) which has the formula: ##STR1## 3,4'-diacyl ester derivatives of mycarosyltylactone wherein each of said esters is an ester of a monocarboxylic acid or a hemi-ester of a dicarboxylic acid, each of 1 to 18 carbon atoms, and the corresponding 3-acyl ester derivatives of tylactone, are useful intermediates in the preparation of macrolide antibiotics. New methods for making tylactone and the 3-acyl ester derivatives of tylactone are provided.

Abstract: A-30912D nucleus, which is prepared by enzymatic deacylation of an antibiotic selected from A-30912 factor D and tetrahydro-A-30912D using an enzyme produced by the Actinoplanaceae, preferably by Actinoplanes utahensis. A-30912D nucleus and salts thereof are useful intermediates to prepare new semi-synthetic antifungal agents.

Abstract: A-30912B nucleus, which is prepared by enzymatic deacylation of an antibiotic selected from A-30912 factor B and tetrahydro-A-30912B using an enzyme produced by the Actinoplanaceae, preferably by Actinoplanes utahensis. A-30912B nucleus and salts thereof are useful intermediates to prepare new semisynthetic antifungal agents.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is a group of the formula: ##STR2## wherein A is divalent oxygen, sulfur, sulfinyl, or sulfonyl; A.sup.1 is divalent oxygen, sulfur, sulfinyl, sulfonyl or --NH--; X is hydrogen, chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkoxy, mercapto, C.sub.1 -C.sub.3 alkylthio, carbamyl or C.sub.1 -C.sub.3 alkylcarbamyl; X.sup.1 is chloro, bromo or iodo; R.sup.2 is hydrogen, C.sub.1 -C.sub.18 alkyl or C.sub.2 -C.sub.18 alkenyl; W is C.sub.1 -C.sub.10 alkylene or C.sub.2 -C.sub.10 alkenylene; m, n and p are 0 or 1, but if m=0, n must=0; provided: that the sum of the carbon atoms in the R.sup.2 and W groups must be greater than 4 but cannot exceed 21; that when X is mercapto, A and A.sup.1 cannot be sulfinyl or sulfonyl; and that when A and A.sup.1 are sulfinyl or sulfonyl, they must be in equal oxidation states.

Abstract: Compounds of the formula ##STR1## wherein R.sup.4 is C.sub.1 -C.sub.6 alkyl and R.sup.1 is an N-alkanoyl amino acyl group of the formula ##STR2## wherein: W is a divalent aminoacycl radical of the formula ##STR3## wherein A is C.sub.1 -C.sub.10 alkylene or C.sub.5 -C.sub.6 cycloalkylene; ##STR4## wherein R.sup.3 is hydroxymethyl, hydroxyethyl, mercaptomethyl, mercaptoethyl, methylthioethyl, 2-thienyl, 3-indolemethyl, phenyl, benzyl, or substituted phenyl or substituted benzyl in which the benzene ring thereof is substituted with chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkylthio, carbamyl, or C.sub.1 -C.sub.3 alkylcarbamyl; ##STR5## wherein X is hydrogen, chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkoxy, mercapto, C.sub.1 -C.sub.3 alkylthio, carbamyl, or C.sub.1 -C.sub.3 alkylcarbamyl; ##STR6## wherein X.sup.1 is chloro, bromo, or iodo; ##STR7## wherein B is a divalent radical of the formula:--(CH.sub.2).sub.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an N-alkanoyl amino acyl group of the formula ##STR2## wherein: W is a divalent aminoacyl radical of the formula: ##STR3## wherein A is C.sub.1 -C.sub.10 alkylene or C.sub.5 -C.sub.6 cycloalkylene; ##STR4## wherein R.sup.3 is hydroxymethyl, hydroxyethyl, mercaptomethyl, mercaptoethyl, methylthioethyl, 2-thienyl, 3-indolemethyl, phenyl, benzyl, or substituted phenyl or substituted benzyl in which the benzene ring thereof is substituted with chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkylthio, carbamyl, or C.sub.1 -C.sub.3 alkylcarbamyl; ##STR5## wherein X is hydrogen, chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkoxy, mercapto, C.sub.1 -C.sub.3 alkylthio, carbamyl, or C.sub.1 -C.sub.3 alkylcarbamyl; ##STR6## wherein X.sup.1 is chloro, bromo, or iodo; ##STR7## wherein B is a divalent radical of the formula: --(CH.sub.2).sub.n --, wherein n is an integer from 1 to 3; --CH.dbd.CH--; --CH.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an N-alkanoyl amino acyl group of the formula ##STR2## wherein: W is a divalent aminoacyl radical of the formula:a) ##STR3## wherein A is C.sub.1 -C.sub.10 alkylene or C.sub.5 -C.sub.6 cycloalkylene;(b) ##STR4## wherein R.sup.3 is hydroxymethyl, hydroxyethyl, mercaptomethyl, mercaptoethyl, methylthioethyl, 2-thienyl, 3-indolemethyl, phenyl, benzyl, or substituted phenyl or substituted benzyl in which the benzene ring thereof is substituted with chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkylthio, carbamyl, or C.sub.1 -C.sub.3 alkylcarbamyl;(c) ##STR5## wherein X is hydrogen, chloro, bromo, iodo, nitro C.sub.1 -C.sub.3 alkyl, hydroxy, C.sub.1 -C.sub.3 alkoxy, mercapto, C.sub.1 -C.sub.3 alkylthio, carbamyl, or C.sub.1 -C.sub.3 alkylcarbamyl;(d) ##STR6## wherein X.sup.1 is chloro, bromo, or iodo; (e) ##STR7## (f) ##STR8## wherein B is a divalent radical of the formula: --(CH.sub.2).sub.