稻麦胚乳游离核的分裂

用整体解剖法和树脂切片法观察了水稻、小麦和大麦胚乳游离核结构和分裂过程。结果表明，（１）胚乳游离核和胚乳细胞的分裂有２种形式：无丝分裂与有丝分裂，其中麦类以有丝分裂为主，水稻则以无丝分裂所占的比例很大；（２）核期结束时，游离核之间产生成膜体，由成膜体形成细胞壁；（３）胚乳核的分裂受多种因素影响，温度对胚乳核分裂影响最显著，气温高时分裂加快，核期缩短；（４）种间的胚乳核差异较大。通常细胞核小的种，核分裂的周期短。     

ISOLATION AND PROPERTIES OF CHICKEN ERYTHROCYTE NUCLEI

(1) A method has been described for the isolation of chicken erythrocyte nuclei using saponin to lake the cells. Nuclei prepared by this method have been compared with nuclei prepared by the method of Laskowskie and with nuclei prepared by a citric acid method, particularly in regard to respiration. (2) The total lipid content of the nuclei is about 14 per cent. and the desoxyribonucleic acid content is about 45 per cent. (3) A yellow pigment contained in the nuclei appears to be xanthophyll. (4) A gel formed by the nuclei at pH 8.5 in the presence of ammonia and the absence of other cations is described.