Abstract: A reversible heat-sensitive recording medium comprising(i) a resin matrix,(ii) at least one organic low molecular weight material (A) which is at least partially insoluble in the resin matrix, exists in the resin matrix by phase separation and is dispersed as particles in the resin matrix, and(iii) an organic low molecular weight material (B) soluble in the resin matrix, wherein the organic low molecular weight material (B) can impart an orientation to the melt of the organic low molecular weight material (A) at a temperature of from T.sub.1 to T.sub.2 (wherein T.sub.1 is the melting point of the organic low molecular weight material (A) in the resin matrix, and T.sub.2 is the melting point of the organic low molecular weight material (B) in the resin material).

Abstract: A reversible heat-sensitive recording composition capable of repeatedly writing or erasing, and a reversible heat-sensitive recording sheet using the composition are disclosed. The reversible heat-sentitive recording composition comprising a leuco compound as a coloring agent and a pyridine derivative having at least one substituent selected from the group consisting of a carboxyl group and a phenolic hydroxyl group.

Abstract: The present invention discloses an electroluminescent element comprising spherical spacer particles in a luminescent layer having a dielectric constant of not less than 10 at 1 KHz and 25.degree. C. and an insulator layer having a dielectric constant of not less than 10 at 1 KHz and 25.degree. C. which both layers are disposed between a transparent electrode and a back electrode, either of said luminescent layer or of said insulator layer having been produced by forming a phosphor paste layer or an insulative paste layer and solidifying each with radiation, respectively.

Abstract: Microorganisms are chemically treated with alkali at a pH of 10.5 - 12.9 and a temperature of 0.degree. - 30.degree. C., washed with water and mechanically ruptured at a pH of 7 - 10.2.

Abstract: A method for treating a microorganism which comprises chemically treating the microorganism with at least one agent selected from the group consisting of an acid, an alkali and a hydrophilic solvent and mechanically rupturing the cell membrane of the resulting chemically treated microorganism using a sand grinder or a three roll mill is disclosed.