多模梯度石英光纤拉丝、涂复技术及对光、力学性能的影响

本文描述了多模梯度石英光纤的拉丝、涂杂技术及其对光纤性能影响,对于GeO_2-P_2O_5-SiO_2三元系采用该技术可望获得强度～100kpsi,0.85μm损耗～2.5db/km,1.30μm损耗～0.7db/km,丝径125±3μm的涂复均匀、同心度良好的一次涂复光纤。文后列有一批反映工艺重复性的数据。     

DIRECT SOMATIC EMBRYOGENESIS AND PLANT REGENERATION FROM PROTOPLAST-DERIVED CELLS OF WHEAT (Triticum aestivum L.)

Protoplasts were isolated from embryogenic calli derived from immature embryos ofwheat (Triticum aestivum L. cv. Jinan 177). The protoplasts were cultured in NMB mediumsupplemented with 1mg/L 2,4- D and 500mg/l casein hydrolysate (CH). The regenerated cellsfrom protoplasts divided to form somatic embryos directly. The somatic embryos grown to1.5- 2 mm in size directly developed into complete plants on solid MB medium without hor-mones.     

小麦原生质体再生细胞直接形成体细胞胚和再生植株

本文用普通小麦品种“济南177”幼胚诱导产生的胚性愈伤组织为材料游离原生质体,培养在附加有1mg/12,4-D和500mg/1水解酪蛋白(CH)的NMB培养基中,原生质体再生细胞直接分裂成为体细胞胚。生长至1.5—2mm大小的体细胞胚在无激素的MB固体培养基上直接发育成为完整再生小植株。