Abstract: A process for preparing crystalline ammonium dihydrogen phosphate, comprises the steps of (a) adding a sequestering agent into ammonium hydrogen phosphate aqueous solution, the sequestering agent reacting with metallic ions contained in the aqueous solution to form water solouble compounds, (b) heat-treating the aqueous solution at a temperature of 70.degree. C. or more after addition of the sequestering agent, and (c) crystallizing ammonium dihydrogen phosphate out of the aqueous solution after the heat-treating, so that crystalline ammonium dihydrogen phosphate can be obtained in high whiteness and in the form of columnar crystals.

Abstract: A purified ring peptide antibiotic of the following empirical formula:N.alpha.-(3-hydroxy-4-methyl-1-oxohexyl)-L-.alpha.,.gamma.-diaminobutyryl-L -isoleucyl-L-.alpha.,.gamma.-diaminobutyryl-D-phenylalanyl-L-leucyl-L-.alph a.,.gamma.-diaminobutyryl-D-valyl-L-leucyl-L-serine (9-1)-lactoneand which has the following structural formula: ##STR1## and wherein Dab represents 2,4-diamino butyric acid.

Abstract: A process for producing hydrogen chloride and ammonia, comprising the steps of carrying out the reaction of ammonium chloride with ammonium hydrogen sulfate in the state of molten salt to produce hydrogen chloride, and heating the reaction system at the above-mentioned reaction carrying step at a temperature of 300.degree. C. or higher to produce ammonia gas, thereby hydrogen chloride and ammonia can be obtained in high yields, overcoming problems encountered in conventional corresponding processes.

Abstract: A process for preparing crystalline ammonium dihydrogen phosphate, comprises the steps of (a) adding a sequestering agent into ammonium hydrogen phosphate aqueous solution, the sequestering agent reacting with metallic ions contained in the aqueous solution to form water soluble compounds, (b) heat-treating the aqueous solution at a temperature of 70.degree. C. or more after addition of the sequestering agent, and (c) crystallizing ammonium dihydrogen phosphate out of the aqueous solution after the heat-treating, so that crystalline ammonium dihydrogen phosphate can be obtained in high whiteness and in the form of columnar crystals.

Abstract: Fungicidal compositions for agricultural and horticultural use are provided which contain as an active ingredient thereof the antibiotics angustmycin A or angustmycin C. They exhibit excellent protective effects against attack by plant disease fungi or bacteria, have no phytotoxicity and cause no pollution in the environment. A method for protecting plants by the use thereof is also provided.