Abstract: Novel peptide B-52653 having the formula: ##STR1## which is produced by cultivating a microorganism belonging to the genus Streptomyces and being capable of producing B-52653 in a culture medium, whereby B-52653 is elaborated and accumulated in the cultured broth and is recovered.B-52653 is useful as a germicide or disinfectant, and a possibility of the present substance as an antifibrotic agent is suggested.

Abstract: Novel peptide B-52653 having the formula: ##STR1## which is produced by cultivating a microorganism belonging to the genus Streptomyces and being capable of producing B-52653 in a culture medium, whereby B-52653 is elaborated and accumulated in the cultured broth and is recovered.B-52653 is useful as a germicide or disinfectant, and a possibility of the present substance as an antifibrotic agent is suggested.

Abstract: The peptide compound represented by the formula: ##STR1## which is useful as a germicide or disinfectant, is produced by reducing a compound of the formula: ##STR2## wherein Y is amino group which may optionally be protected; R.sup.1 is hydrogen or protective group; and R.sup.2 is hydrogen or protective group; and subjecting the reduction product compound to deprotection reaction when required. A compound of the formula: ##STR3## wherein Z is amino group which may optionally be protected; R.sup.1 is hydrogen or protective group; and R.sup.2 is hydrogen or protective group, is a useful as intermediate for production of the first-mentioned compound.

Abstract: The peptide compound represented by the formula: ##STR1## which is useful as a germicide or disinfectant, is produced by reducing a compound of the formula: ##STR2## wherein Y is amino group which may optionally be protected; R.sup.1 is hydrogen or protective group; and R.sup.2 is hydrogen or protective group; and subjecting the reduction product compound to deprotection reaction when required. A compound of the formula: ##STR3## wherein Z is amino group which may optionally be protected; R.sup.1 is hydrogen or protective group; and R.sup.2 is hydrogen or protective group, is a useful as intermediate for production of the first-mentioned compound.

Abstract: A novel antibiotic C-14482 A.sub.1 is produced by cultivating a microorganism belonging to the genus Nocardia and capable of producing Antibiotic C-14482 A.sub.1 is a culture medium, whereby Antibiotic C-14482 A.sub.1 is elaborated and accumulated in the culture medium and recovering the same antibiotic.Antibiotic C-14482 A.sub.1 is useful as a germicide or disinfectant.

Abstract: A novel Antibiotic C-15003 is produced by cultivating a microorganism of the genus Nocardia.The Antibiotic C-15003 is useful as an antifungal agent or an antiprotozoan agent.

Abstract: A novel Antibiotic C-15003 is produced by cultivating a microorganism of the genus Nocardia.The Antibiotic C-15003 is useful as an antifungal agent or an antiprotozoan agent.

Abstract: The present invention relates to a substantially pure culture of the microorganism belonging to the genus Nocardia, which microorganism is capable of producing in a culture medium containing assimilable carbon and digestible nitrogen sources, a recoverable amount of the Antibiotic C-14919 E-1 or E-2 or mixtures thereof having the characteristics described in the specification. These antibiotics have a wide range of antibiotic activity and they are useful as germicides or disinfectants.

Abstract: A novel antibiotic C-14482 A.sub.1 is produced by cultivating a microorganism belonging to the genus Nocardia and capable of producing Antibiotic C-14482 A.sub.1 in a culture medium, whereby Antibiotic C-14482 A.sub.1 is elaborated and accumulated in the culture medium, and recovering the same antibiotic.Antibiotic C-14482 A.sub.1 is useful as a germicide or disinfectant.

Abstract: Novel antibiotics C-14482 B.sub.1, B.sub.2 and B.sub.3 are produced by cultivating a microorganism belonging to the genus Nocardia and capable of producing Antibiotics C-14482 B.sub.1, B.sub.2 and/or B.sub.3 in a culture medium, whereby Antibiotics C-14482 B.sub.1, B.sub.2 and/or B.sub.3 are elaborated and accumulated in the cultured broth and are recovered.Antibiotics C-14482 B.sub.1, B.sub.2 and B.sub.3 are useful as a germicide or disinfectant, respectively.

Abstract: The present invention relates to a method of producing the antibiotics C-14919 E-1 and/or E-2 by cultivating an antibiotic C-14919 E-1 and/or E-2 producing strain of the genus Nocardia in a culture medium and accumulating said antibiotics. These antibiotics have a wide range of antibiotic activity and they are useful as germicides or disinfectants.

Abstract: A novel Antibiotic C-15003 P-4 is specifically produced by cultivating a microorganism of the genus Nocardia in a culture medium containing leucine and/or its derivatives.The Antibiotic C-15003 P-4 is useful as an antifungal agent, antiprotozoan agent and antitumor agent.

Abstract: A novel Antibiotic C-15003 P-3 is specifically produced by cultivating a microorganism of the genus Nocardia in a culture medium containing valine or isobutyric acid and/or their derivatives.The Antibiotic C-15003 P-3 is useful as an antifungal, antiprotozoan and antitumor agent.

Abstract: A novel Antibiotic C-15003 is produced by cultivating a microorganism of the genus Nocardia.The Antibiotic C-15003 is useful as an antifungal agent or an antiprotozoan agent.

Abstract: The present invention relates to antibiotics C-14919 E-1 and E-2 produced by cultivating a microorganism of the genus Nocardia. These antibiotics display a wide activity against e.g. Gram-positive bacteria, fungi and yeast and are useful as germicides or disinfectants.

Abstract: A novel Antibiotic C-15003 is produced by cultivating a microorganism of the genus Nocardia.The Antibiotic C-15003 is useful as an antifungal agent or an antiprotozoan agent.

Abstract: Maytansinol, maytanacine or maytansinol propionate is (are) produced by cultivating a microorganism belonging to the genus Nocardia and being capable of producing maytansinol, maytanacine or maytansinol propionate, causing the microorganism to accumulate maytansinol, maytanacine or maytansinol propionate and recovering the same.Those compounds are useful for anti-tumor agents.