Abstract: A human monoclonal antibody, which has prophylactic and therapeutic effect to infections diseases caused by Pseudomonas aeruginosa, and the epitope of which is located in the outer core moiety of LPS of the microorganism. A hybridoma producing the human monoclonal antibody, and processes for preparing the antibody and hybridoma are also provided.

Abstract: Novel .beta.-lactam compounds belonging to carbapenem or penem derivatives useful as antimicrobial agents or intermediates therefor and a process for producing these compounds are disclosed.

Abstract: A beta-lactam compound of the formula: ##STR1## or a pharmaceutically acceptable salt thereof, which is useful as an anti-microbial agent or an intermediate in the synthesis of anti-microbial agents.

Abstract: A bioactive material is obtained by heating pearl. A calcium component and conchiolin, which is contained in pearl, are activated by heating. Said bioactive material is useful as a plant growth agent, an animal growth agent, a fish growth agent, a medicine, a preservative, and the like.

Abstract: A compound of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom or a lower alkyl group, R.sub.2 is a hydrogen atom or a conventional protecting group for a carboxyl group, R.sub.0 is a hydrogen atom or a conventional protecting group for a hydroxyl group, X is a protected or unprotected amino group, a carboxyl group, a lower alkoxycarbonyl group, an ar(lower)alkyloxycarbonyl group, a cyano group, a hydroxyl group, a lower alkyloxy group, a lower alkylthio group, a lower alkylsulfonyl group or a group of either one of the following formulas: ##STR2## wherein R.sub.3 and R.sub.4, which may be the same or different, each represents a hydrogen atom or a lower alkyl group, or they are taken together to represent an alkylene chain to form, in combination with the adjacent nitrogen atom, a 3- to 7-membered cyclic amino group,--ZCOR.sub.5 (2)wherein Z represents --NH-- or --O-- and R.sub.

Abstract: Novel .beta.-lactam compounds belonging to carbapenem or penem derivatives useful as antimicrobial agents or intermediates therefor and a process for producing these compounds are disclosed.

Abstract: A cephem derivative represented by the general formula ##STR1## wherein R.sup.1 represents hydrogen or methyl, R.sup.2 represents carboxyl or esterified carboxyl, and n represents 0 or 1, or a pharmaceutically acceptable salt thereof; intermediates for the cephem derivative or salt thereof; processes for producing these compounds; and a pharmaceutical composition and method for preventing or treating bacterial infectious diseases, wherein the cephem derivative or the salt thereof is used.

Abstract: A cephem compound represent by the general formula ##STR1## wherein, R.sup.1 represents hydrogen or lower alkyl, R.sup.2 and R.sup.3 are the same or different and each represents hydrogen or lower alkyl, R.sup.4 represents carboxyl or esterified carboxyl, and n represents 0 or 1, a salt of the cephem compound, and a process for producing the cephem compound or a salt thereof. Compounds of the above formula and salts thereof are valuable as antibacterial agents and are especially useful as oral drugs in the prevention or treatment of bacterial infectious diseases.