In the present paper,the authors analysed 10 mineral elements in the roots of Rheum tanguticum collected from 30 different habitats.The mean concentration values of the 10 elements decreased as follows: Ca>Mg>K&...In the present paper,the authors analysed 10 mineral elements in the roots of Rheum tanguticum collected from 30 different habitats.The mean concentration values of the 10 elements decreased as follows: Ca>Mg>K>Fe>Mn>Cr>Zn>Ni>Cu>Se. Ca,Mg,K and Fe were abundant in this herb.Most elements varied over a wide range depending on the different habitats.The mineral element data were evaluated by principal component analysis to reveal the distribution pattern of elements in root.Four principal components(K-Ca factor,Cu factor,Mg factor and Zn-Se factor) of plant elements were selected.The authors' study provided a new scientific foundation for further studies and general application of this Chinese herb.展开更多
研究西昌白鱼雅砻亚种不同温度下的胚胎发育过程,为详细了解该鱼的早期生活史、积累繁殖生物学资料、探索西昌白鱼早期死亡原因、保护野生鱼类资源等提供理论依据。2020年4月22日,挑选雅砻江锦屏•官地鱼类增殖放流站人工驯养的西昌白鱼...研究西昌白鱼雅砻亚种不同温度下的胚胎发育过程,为详细了解该鱼的早期生活史、积累繁殖生物学资料、探索西昌白鱼早期死亡原因、保护野生鱼类资源等提供理论依据。2020年4月22日,挑选雅砻江锦屏•官地鱼类增殖放流站人工驯养的西昌白鱼亲鱼15尾,通过人工干法授精(1雌2雄)获得西昌白鱼受精卵。在恒定水温(14.4±0.8)℃条件下进行孵化,对其胚胎的发育过程进行了观察和描述。结果表明:西昌白鱼成熟卵(n=10)卵径为(1.83±0.15)mm,沉性,粘性,接近无色透明,吸水充分膨胀后卵径为(2.53±0.07)mm;在波动水温“昼(21.5±1.7)℃-夜(15.0±1.2)℃”、恒定水温(23.5±2.2)℃条件下胚胎均不能成功孵化,胚胎均发育至肌肉效应期即全部死亡;在水温(14.4±0.8)℃的条件下,受精后1 h 30 min胚盘隆起,14 h 55 min进入囊胚期,35 h 45 min进入原肠胚期,54 h进入胚孔封闭期,158 h 35 min进入出膜期;胚胎发育积温为2284.4℃·h。初孵仔鱼(n=10)全长(5.77±0.24)mm。西昌白鱼雅砻亚种具有较大的卵径、脊索形成期在胚孔封闭期之前等特征,是其对雅砻江环境的一种适应和进化。展开更多
基金The National Mid-West Fund of China(2001BA901A47)the Knowledge Innovation Programs of the Chinese Academy of Sciences(CXLY-2002-08)
文摘In the present paper,the authors analysed 10 mineral elements in the roots of Rheum tanguticum collected from 30 different habitats.The mean concentration values of the 10 elements decreased as follows: Ca>Mg>K>Fe>Mn>Cr>Zn>Ni>Cu>Se. Ca,Mg,K and Fe were abundant in this herb.Most elements varied over a wide range depending on the different habitats.The mineral element data were evaluated by principal component analysis to reveal the distribution pattern of elements in root.Four principal components(K-Ca factor,Cu factor,Mg factor and Zn-Se factor) of plant elements were selected.The authors' study provided a new scientific foundation for further studies and general application of this Chinese herb.
文摘研究西昌白鱼雅砻亚种不同温度下的胚胎发育过程,为详细了解该鱼的早期生活史、积累繁殖生物学资料、探索西昌白鱼早期死亡原因、保护野生鱼类资源等提供理论依据。2020年4月22日,挑选雅砻江锦屏•官地鱼类增殖放流站人工驯养的西昌白鱼亲鱼15尾,通过人工干法授精(1雌2雄)获得西昌白鱼受精卵。在恒定水温(14.4±0.8)℃条件下进行孵化,对其胚胎的发育过程进行了观察和描述。结果表明:西昌白鱼成熟卵(n=10)卵径为(1.83±0.15)mm,沉性,粘性,接近无色透明,吸水充分膨胀后卵径为(2.53±0.07)mm;在波动水温“昼(21.5±1.7)℃-夜(15.0±1.2)℃”、恒定水温(23.5±2.2)℃条件下胚胎均不能成功孵化,胚胎均发育至肌肉效应期即全部死亡;在水温(14.4±0.8)℃的条件下,受精后1 h 30 min胚盘隆起,14 h 55 min进入囊胚期,35 h 45 min进入原肠胚期,54 h进入胚孔封闭期,158 h 35 min进入出膜期;胚胎发育积温为2284.4℃·h。初孵仔鱼(n=10)全长(5.77±0.24)mm。西昌白鱼雅砻亚种具有较大的卵径、脊索形成期在胚孔封闭期之前等特征,是其对雅砻江环境的一种适应和进化。