Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulat...Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulation of diffraction patterns indicates that both diffraction patterns of the same axis in these two structures obey bcc extinction rule. The conclusion is also obtained from the analyses of the diffracted waves. α'-Fe_(16)N_2 precipitates in the diffusion layer of ion-nitrided α-iron have been studied with transmission electron microscope (TEM). We have distinctly observed the electron diffraction patterns of α'-Fe_(16)N_2 in [100], [111], [110], [011], [210], [021], [311], [113], [331] and [133] zone axes with perfect symmetry, which indicate the parallel orientation relationship with α matrix:<001>α'//<001>α'// {100}.α'// {100}ｔα. The analyses of diffraction patterns, which obey bcc extinction rule, verify the bct structure of α'-Fe_(16)N_2 discovered by X-ray diffraction.展开更多
We describe the temporal and spatial expression pattern of Sox 1 gene during Xenopus laevis early development and compare the expression patterns of Sox 1-3 in the developing eye and brain. Alignment of Sox 1-3 amino ...We describe the temporal and spatial expression pattern of Sox 1 gene during Xenopus laevis early development and compare the expression patterns of Sox 1-3 in the developing eye and brain. Alignment of Sox 1-3 amino acid sequences shows a high conservation within the HMG-box DNA binding domains. RT-PCR analysis indicates that Sox 1 is expressed throughout development from the unfertilized egg to at least the tadpole stage, although at different expression levels. The transcripts of XSox 1 are detected in the animal pole at cleavage and blastrula stages and mainly in the central nervous system （CNS） and the developing eye at neurula stages. The study of the developmental expression of XSox 1 will aid in the elucidation of the function of SoxB 1 subgroup genes in vertebrate neurogenesis.展开更多
文摘Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulation of diffraction patterns indicates that both diffraction patterns of the same axis in these two structures obey bcc extinction rule. The conclusion is also obtained from the analyses of the diffracted waves. α'-Fe_(16)N_2 precipitates in the diffusion layer of ion-nitrided α-iron have been studied with transmission electron microscope (TEM). We have distinctly observed the electron diffraction patterns of α'-Fe_(16)N_2 in [100], [111], [110], [011], [210], [021], [311], [113], [331] and [133] zone axes with perfect symmetry, which indicate the parallel orientation relationship with α matrix:<001>α'//<001>α'// {100}.α'// {100}ｔα. The analyses of diffraction patterns, which obey bcc extinction rule, verify the bct structure of α'-Fe_(16)N_2 discovered by X-ray diffraction.
文摘We describe the temporal and spatial expression pattern of Sox 1 gene during Xenopus laevis early development and compare the expression patterns of Sox 1-3 in the developing eye and brain. Alignment of Sox 1-3 amino acid sequences shows a high conservation within the HMG-box DNA binding domains. RT-PCR analysis indicates that Sox 1 is expressed throughout development from the unfertilized egg to at least the tadpole stage, although at different expression levels. The transcripts of XSox 1 are detected in the animal pole at cleavage and blastrula stages and mainly in the central nervous system （CNS） and the developing eye at neurula stages. The study of the developmental expression of XSox 1 will aid in the elucidation of the function of SoxB 1 subgroup genes in vertebrate neurogenesis.
