Abstract: Provided is a nucleic acid construct for expressing a gene of interest, the nucleic acid construct comprising, in order from 5?-terminus, each sequence of: (a) a 5? long terminal repeat (LTR) sequence derived from a retrovirus; (b) a packaging signal sequence (IV) derived from a retrovirus; (c) a sequence or multiple cloning site of the gene of interest; (d) a post-transcriptional regulatory sequence (PRE); (e) an siRNA generating sequence which forms at least one stem-loop structure and in which RNA, which induces RNA interference in mammalian cells, is transcribed; and (f) a 3? LTR sequence derived form a retrovirus.

Abstract: An organic electron transport material, which includes a phosphine oxide derivative represented by the following Formula (1): R1 represents an atomic group which has one or more of either or both of aryl and heteroaryl groups and may have one or more phosphine oxide groups, R2 to R11 each independently represent an atom or an atomic group selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a nitro group, a carboxyl group, a formyl group, a carbonyl group, an alkoxycarbonyl group, and a trifluoromethyl group.

Abstract: An organic electron transport material, which includes a phosphine oxide derivative represented by the following Formula (1): R1 represents an atomic group which has either or both of one or more aryl groups and one or more heteroaryl groups and which may have one or more phosphine oxide group, and R2 to R9 each independently represent an atom or an atomic group selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a C1-C12 linear or branched alkyl group, a linear or branched fluoroalkyl group, an aryl group, a substituted aryl group, a heteroaryl group, and a substituted heteroaryl group.

Abstract: An organic electron transport material, which includes a phosphine oxide derivative represented by the following Formula (1): R1 represents an atomic group which has either or both of one or more aryl groups and one or more heteroaryl groups and which may have one or more phosphine oxide group, and R2 to R9 each independently represent an atom or an atomic group selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a C1-C12 linear or branched alkyl group, a linear or branched fluoroalkyl group, an aryl group, a substituted aryl group, a heteroaryl group, and a substituted heteroaryl group.

Abstract: An organic electron transport material, which includes a phosphine oxide derivative represented by the following Formula (1): R1 represents an atomic group which has one or more of either or both of aryl and heteroaryl groups and may have one or more phosphine oxide groups, R2 to R11 each independently represent an atom or an atomic group selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a nitro group, a carboxyl group, a formyl group, a carbonyl group, an alkoxycarbonyl group, and a trifluoromethyl group.