根株

As basswood is smooth and easy to cut,it is commonly used in pencil manufactories to make lead holders. For 7 billion pencils 3 million basses will be cut down a year.

由于极木具有木材细致、容易切削的特点，目前生产制作铅笔的厂家都以极木做笔杆材料。70亿支铅笔就意味着每年有300万株天然优质根木遭砍伐。

Some taxon-selective primers that were intended to be specific to fungi and basidiomycetes respectively have been designed and tested to characterize fungal symbionts by amplification of specific sequences in the nuclear ribosomal unit.

大量DNA分析新技术在丛枝菌根真菌的分子遗传、分类鉴定、种间及种内亲缘关系、菌株持久性等方面得到应用，与传统菌根研究方法相比，表现出巨大的优越性。

Three donor wheat all show good character and had little genotypical difference in the aspect of inducement、differentiation、regeneration etc. They could all nice genotypical cultivars for wheat transformation. 3160 embryos have been used to transformation (960 embryos belongs to Atlas66, 1000 embryos belongs to EM12, 1200 embryos belongs to Scout66 respectively), At last, we got twenty-six of which were positive cultivars through PCR. The preliminary whole transformation frequency was 0.82 percent. Also the citrate synthase activities of the leaves of T_0 progeny show 5～9 higher than the control lines.

转化过程中分别使用了960个Atlas66、1000个EM12和1200个Scout 66幼胚(总记3160个)，经抗性筛选、CS与标记基因的PCR检测初步表明有26株为阳性植株，总转化率为0.82%；同时进一步对T_0代植株叶片柠檬酸合酶以及T_1代植株经铝胁迫后对其根尖分泌物进行检测，结果在上述转化植株中检测到了柠檬酸合酶的活性，且转化材料比对照材料平均高出了5～9倍；同时铝胁迫后，T_1植株根尖检测到了苹果酸及柠檬酸的分泌。

With the increasing of water lever, Myriophyllum spicatum increased the plant height, allocated more biomass to their leaves and decreased the allocation to roots and stems. However, Potamogeton maackianus allocated most biomass to their stems and decreased the allocation to leaves and roots.

实验发现：随着水位上升，狐尾藻株高也增加，并且将更多的生物量分配到叶片部分，减少对根和茎的资源投入；而微齿眼子菜则将生物量大部分投入到茎杆，减少对叶片和根的资源分配。

With the increase in Cu concentration in the solutions of the water culture, the plant height, biomass of the overground part, root length and weight of the vegetables decreased.

在水培条件下，随着铜添加浓度的升高，各蔬菜的株高、地上部生物量、根长和根重均逐渐降低。

The growth of plantlets with the height of 1-2 cm and 3-4 leaves was compared on MS basal medium containing various organic compounds, including banana, carrot, potato, coconut water, and tryptone. The result showed that the growth of oncidium plantlets was the best on medium containing banana, potato and tryptone altogether with respect to their plant height, leave number, root number, root length, fresh weight, and dry weight. The next better media were the control and the Banana medium, followed by the Potato medium.

另外取高约1-2公分，带3-4片叶片的分化小苗，培养於含不同浓度有机添加物（香蕉、胡萝卜、马铃薯、椰子水、及tryptone）的半量MS培养基，以探讨最适合文心兰瓶苗生长的培养基，试验结果显示，在同时含香蕉、马铃薯及tryptone三种成份的培养基生长的小植株不论在株高、叶数、根数、根长、鲜重、及乾重均较其他培养基为佳；不含添加物之1/2MS培养基、及含香蕉的培养基次之，而在含马铃薯之培养基较差。

The effects of bur cucumber as rootstock on the mass of the first fruit, the number of female flowers on the main stem in 20 nodes, plant height, area of the biggest leaf, number of leaves, stem diameter, number of nodes were in the middle of the effects of black seed pumpkin as rootstock and self-rooted cucumber.

结果表明，棘瓜嫁接可使'中农21号'黄瓜的第1雌花开放期和始收期提前，对根瓜质量、20节内的雌花数、株高、最大叶面积、叶片数、茎粗和节数的影响小于'黑籽南瓜'嫁接处理；前者的抗寒能力、净光合速率强于后者和自根苗；棘瓜嫁接对黄瓜具有增产、抗枯萎病、抗根结线虫的作用，并且果实品质显著优于以黑籽南瓜嫁接的。

It is difficult to select the lactic acid high-producing strain by observing the color change zone because of spreading grow along the solid medium of Rhizopus oryzae. A serious of methods for selection and breeding of L-lactic acid high-producing mutant were developed.

米根霉在固体平板上生成的乳酸会使培养基中加入的pH指示剂变色，在菌落周围呈现出变色圈，但由于丝状真菌米根霉在固体培养基表面蔓延生长的特性，使得无法得到单菌落，进而无法通过观察变色圈与菌落直径之比来比较出各菌株产酸能力的高低。

Everyone sees, whether seem a lot of stub banyans, is the branch and trunk of banyan in fact on have a long root, there is many root to keep hanging ground, usually give the person the illusion.

大家看，是不是像是很多株榕树，其实是榕树的枝干之上有长根，有许多根直垂到地上，常常给人错觉。

Field grafting control experiment showed that the disease will be controlled more by using one scion grafts with numbers of resistant cylindrical loofahs as rootstocks and pruning the basal part of scion in time.

而在田间之嫁接防治试验发现，选用较为抗病之圆筒型丝瓜品种/系作为根砧，利用割裂靠接法嫁接多株根砧，并及时剪除接穗地基部可增进嫁接丝瓜对萎凋病之防治效果。

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。