Reaction mass containing mixed oxides of iron with one or more metals of groups IV to VII of the periodic table of the elements, wherein the mixed oxides are deposited in finely divided form on an inert refractory substrate with a high specific surface area. The invention also relates to methods for the manufacture of this reaction mass as well as the use thereof as a catalyst for the shift reaction of carbon monoxide with steam, forming carbon dioxide and hydrogen at an elevated temperature, an...

Novel aminoglycosides of the following formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and each represents a hydrogen atom or a methyl group, R.sub.3 represents a hydrogen atom or an optionally substituted aminoacyl group having 2 to 4 carbon atoms in the acyl moiety, and when all of R.sub.1, R.sub.2 and R.sub.3 are hydrogen atoms, the methylamino group at the 4-position is not oriented trans to the hydroxyl groups at the 3- and 5-positions; and acid addition salts thereo...

Novel maytansinoids of the formula: ##STR1## wherein R.sup.1 is hydrogen atom, an alkyl group which may optionally be substituted or a group of the formula: --A.sup.1 --Y.sup.1 wherein A.sup.1 is an alkylene group or a bond, and Y.sup.1 is a cycloalkyl, phenyl, indolyl or imidazolyl group which may optionally be substituted, R.sup.2 is hydrogen atom, an alkyl, cycloalkyl or benzyl group, R.sup.3 is hydrogen atom, an alkyl group which may optionally be substituted, alkoxy, bornyloxy, isobornyloxy...

Novel maytansinoids of the formula: ##STR1## wherein X is H or Cl, and Y is Cl, OH, SH, CN, NO.sub.2, --OR or --S(O).sub.n R wherein R is slkyl, aryl, aralkyl or azaheterocyclic group which may be substituted, and n is 0, 1 or 2, have antimitotic, antitumor and antimicrobial activities.

Novel maytansinoids of the formula: ##STR1## wherein X is H or Cl, and R is ##STR2## wherein R.sup.1 and R.sup.2 may be the same or different, and each is H or a substituted or unsubstituted hydrocarbon residue or heterocyclic group, or R.sup.1 and R.sup.2 may, taken together with the adjacent N atom, form a heterocyclic group, and R.sup.3 is a substituted or unsubstituted hydrocarbon residue, have antimitotic, antitumor and antimicrobial activities.

The invention concerns peptides, having the pharmaceutical property of enhancing the immune response, having the structure: ##STR1## wherein R.sup.1 is alkanoyl, R.sub.b.sup.1 is hydrogen, methyl, isopropyl, hydroxymethyl, protected hydroxymethyl or benzyl, R.sup.2 is hydrogen, carboxy, protected carboxy or a group of the formula: ##STR2## wherein R.sub.a.sup.2 is mono- or di-carboxy (or protected carboxy) lower alkyl or ar(carboxy or protected carboxy) lower alkyl whose aryl moiety is substitut...

A curable composition comprising (A) a monomer mixture containing as an essential component thereof a mixture of 20 to 80% by weight of an aliphatic polyfunctional (meth)acrylate and 80 to 20% by weight of an aromatic vinyl compound, (B) an inorganic filler having an average particle diameter of not more than 5 microns, and (C) a catalytic amount of a polymerization initiator, and having said inorganic filler (B) dispersed in an amount of 250 to 800 parts by weight per 100 parts by weight of sai...

A method for the manufacture of a reactive polymer, which comprises causing (A) a polymer containing a free carboxylic group in an acid equivalent in the range of 0.01 to 5 milliequivalent/g and (B) an unsaturated aziridine compound possessing one aziridinyl group and at least one radically polymerizable unsaturated group in the molecular unit thereof to react with each other in proportions such that the amount of said unsaturated aziridine compound falls in the range of 0.05 to 1.2 mole per 1.0...

The invention relates to novel peptides of enhanced pharmacological activity of the formula: ##STR1## wherein R.sup.1 is alkanoyl; R.sup.2 and R.sup.q are each hydrogen, carboxy, protected carboxy, or a group of the formula: ##STR2## wherein R.sub.a.sup.2 is mono- or di-carboxy (or protected carboxy) lower alkyl or ar(carboxy or protected carboxy) lower alkyl whose aryl moiety may be substituted by hydroxy, R.sub.b.sup.2 is hydrogen or lower alkyl; R.sup.P is hydrogen, carboxy, protected carboxy...

The invention relates to a new compound, designated FR-68504. The compound has antitimor activities and is effective in the treatment of various tumors in both human beings and animals. There is also provided a process for preparing FR-68504 compound which comprises culturing a FR-68504 producing strain belonging to the genus Amauroascus in a nutrient medium. Pharmaceutical composition comprising FR-68504 as an active ingredient is also described.