悬铃木

The results showed that Pb, Cd and Cu in the leaves of plants were positively related to their concentration in air significantly. The content of heavy metal in plant leaves was obviously associated with the heavy metal properties, pollution conditions and tree species. Platanus hispanica had a higher accumulation in Pb, While Populus deltoides in Cd and Cu.

研究表明，植物叶片中重金属Pb、Cd和Cu的累积量与大气中Pb、Cd和Cu的相对含量呈显著正相关；所调查绿化树种叶片的重金属含量因重金属种类、采样区和树种的不同具有明显差异，悬铃木叶片累积Pb的能力最强，而杨树叶片对Cd和Cu的累积能力最强。

London plane tree (Platanus acerifolia Willd.) is widely planted and applied in the city landscape, known as "the king of street trees".

悬铃木因其众多优点在园林绿化中广泛应用，并享有&行道树之王&的美称。

Adventitious shoots were successfully regenerated from leaf explants of in vitro cultures of Platanus orientalis Wilid, varieties with common fruits and fewer fruits separately.

以普通果球和少果球悬铃木为供试材料，建立了叶片不定芽再生体系。

Platanus acerifolia;Pollen;Vitality;Storage Capacity

悬铃木；花粉；生活力；贮藏力

The results showed that the transformation efficiency of the leaves precultured for 9 d on preculture medium, infested in OD value equal to 0.7 bacterium medium for 10 min, and then co-culture in dark conditions and co-cultured medium with 100μmolL^(-1) acetosyringone for 3 d respectively; was optimal.

结果表明，预培养9d的悬铃木叶片在OD600值为0.7的根癌农杆菌菌液中浸染10min后，再在含有100μmolL^(-1)的乙酰丁香酮的共培养培养基上黑暗条件下共培养3d叶片的遗传转化效率最高。

In order to better understand the determinants of tree height limit,32 tall tree species such as Parashorea chinensis,Sapium baccatum,Garcinia cowa,Eucalyptus citriodora,E.grandis×E.urophylla,Albizia falcataria,Populus tomentosa,Platanus hispanica,Ginkgo biloba,Pinus tabulaeformis,Ulmus pumia,Salix gordeivii,and Elaeagnus angustifolia from typical environments such as Xishuangbanna rainforest,Guangzhou subtropical area,Zhengzhou,Beijing,Helanshan mountain and Maowusu sandland in China were studied.

为了更好地了解树高极限的限制因素，本文对全国典型水分分布区域西双版纳、广州、郑州、北京、贺兰山和毛乌素沙地等地区生长的望天树、浆果乌桕、小叶藤黄、柠檬桉、巨尾桉、南洋楹、毛白杨、悬铃木、银杏、油松、榆树、沙枣、小黄柳等32种较高的木本植物进行了研究。

The results showed: four devices flower pollen sacs, anther wall conforms to the basic, from epidermis, the indoor wall, middle (2-3 layers) and tapetal composition tapetum to glandular type.

对悬铃木小孢子发生及雄配子体发育过程进行了观察，结果表明：花药具4个花粉囊，花药壁发育为基本型，由表皮、药室内壁、中层（2-3层）和绒毡层组成，绒毡层为腺质型。

In one direction from my house there was a colony of muskrats in the river meadows; under the grove of elms and buttonwoods in the other horizon was a village of busy men, as curious to me as if they had been prairie-dogs, each sitting at the mouth of its burrow, or running over to a neighbor's to gossip.

从我的屋子向着一个方向望过去，河畔的草地上，有着一个麝鼠的聚居地；而在另一个地平线上，榆树和悬铃木底下，却有一个满是忙人的村子，使我发生了好奇之心，仿佛他们是大草原上的狗，不是坐在他们的兽穴的人口，便是奔到邻家闲谈去了。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。