腰椎间盘突出(Lumbar Disk HerniationLDH)症为常见的下位腰腿痛疾病。占成年人腰腿痛疾患的60％～80％。国内外文献报告关于影像学检查方法很多,其中CT扫描已成为骨科临床诊治的必要手段。近年多数作者对本病的病理诊断分型,实验研究...腰椎间盘突出(Lumbar Disk HerniationLDH)症为常见的下位腰腿痛疾病。占成年人腰腿痛疾患的60％～80％。国内外文献报告关于影像学检查方法很多,其中CT扫描已成为骨科临床诊治的必要手段。近年多数作者对本病的病理诊断分型,实验研究、临床诊断等方面进行大量研究。展开更多
腰椎间盘突出(Lumbar Disk Herniation LDH)症为常见的下位腰腿痛疾病,占成年人中腰腿痛病因的60％～80％。国内外文献报告关于LDH的影像学检查方法很多,尤以CT扫描较普及,当怀疑本症时,如不作CT检查,当视为是一缺憾,而在骨科临床则参...腰椎间盘突出(Lumbar Disk Herniation LDH)症为常见的下位腰腿痛疾病,占成年人中腰腿痛病因的60％～80％。国内外文献报告关于LDH的影像学检查方法很多,尤以CT扫描较普及,当怀疑本症时,如不作CT检查,当视为是一缺憾,而在骨科临床则参照腰椎CT扫描已作为诊治LDH的必要手段。展开更多
It has been generally held in botany that Oryza sativa L. is a monocotyledon. Based on studies of rice embryo development we confirmed that rice embryo has two dimorphic cotyledons rather than just one cotyledo...It has been generally held in botany that Oryza sativa L. is a monocotyledon. Based on studies of rice embryo development we confirmed that rice embryo has two dimorphic cotyledons rather than just one cotyledon. In the present study we attempt to know if the morphology of embryos in other species of Oryza differs from O. sativa and if these embryos have dimorphic cotyledon. Two types of embryo structures were observed in 22 species and/or subspecies of genus Oryza under the scanning electron microscope. Type 1, the O.sativa type, which is characterized by ventral scale and lateral scales, was found in 16 species. Type 2, the O. meyeriana (Zoll. et Mor. ex Steud.) Baill. ssp. tuberculata W. C. Wu et Y. G. Lu, G. C. Wang type, with no ventral scale and lateral scales, was found in 6 species and subspecies. The embryogenic process of O.sativa and O.meyeriana sub. tuberculata showed that the scutellum primordium, coleorhiza primordium, coleoptile primordium and shoot apical meristem directly differentiate from proembryo. The former two later develop into the embryo envelope, which is the outside cotyledon; the coleoptile primordium develops into the coleoptile with the shape of inverted empty cone surrounding and covering the growth cone, which is the apical cotyledon. Both types of rice embryos have dimorphic cotyledons. The structural difference between them is that the scutellum primordium of the young embryo in type 2 does not differentiate ventral scale and lateral scales while the embryo of type 1 does. The dimorphic cotyledons of embryo of Oryza plants originate from the dorsiventrality of proembryo.展开更多
文摘腰椎间盘突出(Lumbar Disk Herniation LDH)症为常见的下位腰腿痛疾病,占成年人中腰腿痛病因的60％～80％。国内外文献报告关于LDH的影像学检查方法很多,尤以CT扫描较普及,当怀疑本症时,如不作CT检查,当视为是一缺憾,而在骨科临床则参照腰椎CT扫描已作为诊治LDH的必要手段。
文摘It has been generally held in botany that Oryza sativa L. is a monocotyledon. Based on studies of rice embryo development we confirmed that rice embryo has two dimorphic cotyledons rather than just one cotyledon. In the present study we attempt to know if the morphology of embryos in other species of Oryza differs from O. sativa and if these embryos have dimorphic cotyledon. Two types of embryo structures were observed in 22 species and/or subspecies of genus Oryza under the scanning electron microscope. Type 1, the O.sativa type, which is characterized by ventral scale and lateral scales, was found in 16 species. Type 2, the O. meyeriana (Zoll. et Mor. ex Steud.) Baill. ssp. tuberculata W. C. Wu et Y. G. Lu, G. C. Wang type, with no ventral scale and lateral scales, was found in 6 species and subspecies. The embryogenic process of O.sativa and O.meyeriana sub. tuberculata showed that the scutellum primordium, coleorhiza primordium, coleoptile primordium and shoot apical meristem directly differentiate from proembryo. The former two later develop into the embryo envelope, which is the outside cotyledon; the coleoptile primordium develops into the coleoptile with the shape of inverted empty cone surrounding and covering the growth cone, which is the apical cotyledon. Both types of rice embryos have dimorphic cotyledons. The structural difference between them is that the scutellum primordium of the young embryo in type 2 does not differentiate ventral scale and lateral scales while the embryo of type 1 does. The dimorphic cotyledons of embryo of Oryza plants originate from the dorsiventrality of proembryo.
