Abstract: The present invention provides a crystal of a europium compound containing europium. The present invention enables the preparation of a crystal of a europium compound having a powder X-ray diffraction pattern having a first diffraction peak in diffraction angle (2?) range of 34.3° to 36.1° in which a half width of the first diffraction peak is 1.8° or less, and/or having a second diffraction peak in diffraction angle (2?) range of 28.6° to 29.6° and a third diffraction peak in diffraction angle (2?) range of 36.8° to 38.4° in which a half width of the second diffraction peak is 1.0° or less and a half width of the third diffraction peak is 1.6° or less, and being at least one compound selected from compounds represented by formulae (1) to (4): EuClx??(1) Eu(OH)2??(2) Eu(OH)2Cl??(3) EuOCl??(4) x is 0.05 or more and 5 or less.

Abstract: Provided are: a composite of a silicate-based base material and a rare-earth compound, having high light-emitting intensity and capable of being used as light-emitting particles, light-emitting nanoparticle including the same, a cell detection method, a method for treating an animal, a medical device, and a method for producing the composite of a silicate-based base material and a rare-earth compound. This composite of a silicate-based base material and a rare-earth compound includes elemental silicon (Si) and elemental oxygen (O), the rare-earth compound comprising at least one selected from a chloride of a rare-earth element and a fluoride of a rare-earth element, the silicate-based base material having a solid 29Si-NMR spectrum satisfying Q4/Q3 of 1.6 to 3.9 where Q4 represents a peak area derived from Si(OSi)4 and Q3 represents a peak area derived from HO—Si(OSi)3.

Abstract: Provided are light-emitting nanoparticles that exhibit light emission stability and light resistance and are less biologically toxic. The light-emitting nanoparticles contain a matrix material and a light-emitting substance included in the matrix material, wherein the matrix material contains a cationic element that is at least one member selected from the group consisting of Ti, Si, Ca, Al and Zr, and an anionic element that is at least one member selected from the group consisting of O and P; and the concentration of the light-emitting substance in the matrix material is set to a level that results in an average distance of 1.2 nm or more between pieces of the light-emitting substance.

Abstract: The purpose of the present invention is to provide a cell culture substratum which has excellent resistance to liquid culture media and low cytotoxicity, can achieve a high cell adhesion ratio and a high viability of cultured cells, has excellent thermal stability, and is less likely to absorbs ultraviolet ray.

Abstract: The purpose of the present invention is to provide a cell culture substratum which has excellent resistance to liquid culture media and low cytotoxicity, can achieve a high cell adhesion ratio and a high viability of cultured cells, has excellent thermal stability, and is less likely to absorbs ultraviolet ray.

Abstract: Provided are light-emitting nanoparticles that exhibit light emission stability and light resistance, and are less biologically toxic. The light-emitting nanoparticles contain a matrix material and a light-emitting substance included in the matrix material, wherein the matrix material contains a cationic element that is at least one member selected from the group consisting of Ti, Si, Ca, Al and Zr, and an anionic element that is at least one member selected from the group consisting of O and P; and the concentration of the light-emitting substance in the matrix material is set to a level that results in an average distance of 1.2 nm or more between pieces of the light-emitting substance.

Abstract: A polyp or cell block collecting instrument adapted for use with an endoscope having a suction passage. The instrument includes an upper stream tube section having a coupling end and a lower stream tube section having a coupling end removably coupled to the coupling end of the upper stream tube section. The coupling ends of the upper and lower stream tube sections have expanded diameter. A filter is mounted in the tube adjacent the coupling ends of the tube sections.