洋桔梗叶盘高频率不定芽诱导的初步研究

采用正交设计法研究了细胞分裂素ZT,生长素NAA,培养基pH值和光照强度对洋桔梗叶盘不定芽诱导的影响.结果表明,实验的4个因子对洋桔梗叶盘不定芽都具有极显著的诱导作用,最佳培养基和培养条件为:MS ZT 0.5 mg/L NAA 0.01 mg/L,培养基pH值为6.3,光照强度为3000 lx.该处理中每叶盘再生不定芽数平均达9.41个.     

我国三种野生稻及两个栽培稻品种叶片表面亚显微结构的观察研究

用扫描电钻对原产中国的3种野生稻、2个栽培稻品种就气孔频度、气孔器孔突、大瘤状乳突及木栓细胞乳突等叶片表面亚显微结构作了比较观察研究。结果显示这些性状具有种的特异性,并且其相似程度与亲缘关系远近有关。     

几种红树植物叶片过氧化物酶同工酶谱

本文采用聚丙烯酰胺凝胶电泳法分析了秋茄（Kandelia candel)、白骨壤（Avicennia marina)、木榄（Bruguiera gymnorhiza)、桐花树（Aegiceras corriculatum)、红海榄（Rhizophora stylosa)等5种红树植物叶片过氧化物酶同工酶（Peroxidase Isozymes)，发现经扫描记录后它们的酶谱图形各不相同，在峰高与峰数量上既存在种间的差异，又有同种间因生长地区各异的不同。     

Forest leaf litter quantity and seedling occurrence along an urban-rural gradient

Leaf litter, by modifying microenvironmental conditions, can alter plant population distributions and is considered to be a major force in structuring many plant communities. Comparative studies of urban, suburban, and rural forests in the New York City (NYC) metropolitan area have identified numerous biotic and abiotic differences among these forests, including several involved in leaf litter decomposition. These differences in decomposition among the forests could result in differences in litter quantity on the forest floor and hence microenvironmental conditions and safe sites for germination of different plant species. We conducted a survey of forest floor leaf litter quantity in forests located along an urban-to-rural land-use gradient originating in urban NYC and extending to rural Connecticut. Mean litter depth, mass, and density increased significantly with increased distance of the forest from NYC.We also surveyed woody seedlings and compared the litter depth in which they naturally occurred to the mean litter depth of the surrounding forest. Seedlings of small-seeded species were much more likely to be located in litter shallower than mean forest litter depth than were seedlings of large-seeded species. Taken together, these results suggest that environmental changes associated with urbanization may have profound effects on long-term patterns of forest regeneration.     

古籍“旋风装”演变探微

受文献和留存实物的限制,学界对古籍旋风装的具体装帧形式一直存在着争议。本文在综合前人研究成果的基础上,认为古籍旋风装在形成、发展和演变过程中经历了旋风叶卷子（龙鳞装）、旋风叶（叶子）、旋风册子（经折装）三种不同的装帧形态。     

Effect of avian predation on survival of leaf-rolling lepidopterous larvae

Manipulative field experiments were performed in a northern Japanese deciduous forest to determine the role of avian predation in the survival of three leaf-rolling lepidopterous larvae (Homonopsis foedenratana, Archips viola, and Zeiraphera corpulentana) on Japanese lilac (Syringa reticulata) trees. When all leaf rolls on the lilacs were experimentally removed, the visitation rate of birds declined, indicating that the leaf rolls served as a visual cue for the birds. In a second experiment in which birds were excluded from the lilac trees, the survival of H. foedenratana larvae was improved, whereas the mortality of the other two Lepidoptera stayed the same. This is probably the result of differences in the shape of leaf rolls; larvae of H. foedenratana alter the leaf form to a greater extent, which may facilitate the detection of the rolls by birds. The high predation rate on the tight leaf rolls of H. foedenratana may be offset by enhanced resistance against other predators and better food quality for the enclosed larvae. Received: January 30, 1998 / Accepted: December 2, 1998     

银杏叶粉酥性饼干加工工艺研究

以银杏叶粉和低筋面粉为主要原料，采用单因素实验和正交实验相结合的方法，研究了银杏叶酥性饼干生产加工中各原辅料添加量对酥性饼干感官质量的影响.实验结果表明：银杏叶酥性饼干的最佳配方为：低筋面粉100 g、银杏叶粉6 g、绵白糖32 g、碳酸氢钠1 g、碳酸氢铵1 g、饴糖10 g、鸡蛋17 g、起酥油29 g时，产品感官质量最佳.     

金花梨叶片不定梢再生体系研究

以金花梨试管苗叶片为试验材料,每叶片横切三刀,培养在NN69培养基上,先暗培养三周再转自光下,实验表明:NN69 细胞分裂素5.0 mg/l(BA2.5 KT1.25 ZT1.25) IBA0.3mg/l为诱导叶片产生不定梢的最佳培养基配方。     

明快柔和的黎明鸟歌——评石太瑞的诗集《黎明鸟》

石太瑞立足于湘西这块神奇而古老的土地 ,执著于民俗风情 ,描绘出一幅幅古朴醇厚的湘西民俗画 ,用叶笛吹奏出明快柔和的湘西牧歌     

烟叶煎汁培养基中烟叶用量对烟草赤星病菌生长和产孢能力的影响

用烟草赤星病菌(Alternaria alternata)7个菌株测定的结果表明,病菌在各5种含量的干烟叶和鲜烟叶煎汁培养基(分别简称 DTLA 和 FDTLA)上较在 PDA 培养基上的生长能力差。病菌达到最大生长量时,DTLA 中干烟叶和 FDTLA 中鲜烟叶用量分别为30g/L 和30～50g/L,烟叶用量增加趋向于抑制病菌生长。产孢能力在烟叶煎汁培养基(TLA)上较在PDA 上为强,并随烟叶用量增加呈逐渐增强趋势,分别以烟叶用量60～90g/L(DTLA)和100～150g/L(FDTLA)为产孢饱和点。在 FDTLA 中加入蛋白胨能降低病菌的生长能力,但可增强产孢能力强的菌株的产孢量。