查询词典 xylem

In the primary structure of root, the primary xylem is diarch and the development of both the primary xylem and the primary phloem is exarch.

在根的初生结构中，其初生木质部为二原型，木质部及韧皮部的发育均为外始式。

Results showed: in Podocarpus leaves, there is only one midrib, the xylem tracheid of midrib vascular bundle is multi-form, transfusion tissue belongs to Cycas-type and transfusion tracheids are isodiametric, the accessory transfusion tracheids between palisade tissue and sponge tissue are developed; in Nageia leaves, there are plenty of parallel leaves, the xylem tracheids of each vein are relatively simple, transfusion tissue belongs to Taxus-type and transfusion tracheids are longer in longitudinal section than that in transverse section, the accessory transfusion tissue between palisade tissue and sponge tissue is absent.

结果表明：罗汉松属叶1条主脉，主脉维管束木质部管胞发达，转输组织为苏铁型，转输组织管胞等径，栅栏组织和海绵组织之间的副转输组织管胞发达；竹柏属叶多条平行叶脉，维管束木质部管胞相对不发达，转输组织为红豆杉型，转输组织管胞纵向伸长，栅栏组织和海绵组织之间不存在副转输组织。

The existence of nuclei in mature xylem cells is a symbol of primitiveness, for such nuclei all exist in secondary xylem of families or genera which are in the rather primitive stage of development in plant systems.

成熟木材细胞中的细胞核是一个原始的特征，均出现在植物系统发育上较为原始的科属木材中。

Primary xylem Xylem derived from the procambium in the young plant.

初生木质部：指幼嫩植物中来源于原形成层的木质部。

This indicated that arrowleaf saltbush was able to change the ultrafiltration characteristics of its root system and reduce radial reflection coefficient of the root, thus lowering the risk of higher xylem tension leading to xylem cavitation and able to reduce salt absorption to avoid damage of salt over-accumulation to the plant.

说明三角叶滨藜在盐胁迫下一方面通过改变根系的超滤特性，降低根系径向反射系数来防止木质部拉力过大导致的木质部空化的危险，另一方面通过减少对盐分的吸收来避免盐分过多积累对植株的伤害。

Sapwood The outer living xylem cells in a tree trunk, consisting of secondary xylem elements, that are actively involved in water transport and food storage.

边材：由树干近外方的有生命的木质部细胞构成，包括次生木质部、薄壁组织和髓射线。在植物的水分运输及养料储存方面起重要作用。

The exterior of root system of Melilotodes in adult period mostly covers a flat thick"velamen"in the course of growth and development. The polysaccharide in the interior of root system lies in secondary phloem and secondary xylem and xylem ray ,which distributes uniformity.

在生长发育过程中，生长5年的扁蓿豆成株大部分根系外面覆盖了一层厚厚的"根被"，其根系内部多糖存在于次生韧皮部和次生木质部及木质射线中，颗粒在细胞中分布较均匀。

The exterior of root system of alfalfa in adult period hasn't velamen. The polysaccharide in the interior of root system lies in partial secondary phloem and xylem ray of secondary xylem, which doesn't distribute uniformity.

这与苜蓿有差别，苜蓿成株根系外侧没有"根被"，且根系内部多糖存在于部分次生韧皮部和次生木质部的木质射线中，分布不均匀。

Deep research and comparison show that, besides the centrarch xylem, H. reflexa has G-type tracheids. Upon and between the annular secondary thickenings, the lignified layer of secondary cell wall bears irregular simple perforations of small diameter and high density. So these perforations have the characters of S-type tracheids. The robust xylem strand and dense perforations indicate the strengthened water-conducting capacity.

深入的研究和比较表明H.reflexa的木质部除为心始式外，管胞为G-型，次生壁的木质化层具有不规则的简单穿孔，穿孔直径小，密度大，分布在环纹次生加厚带和其间，兼有S-型管胞穿孔的特征；粗壮的木质部束和密集的穿孔表明较强的输导能力。

In addition, the repair method can also be filled tree holes, stuffing is best to use small gravel and cement mixture to be compacted filler, filler to strengthen the connection with the xylem, inside the cave can be a number of electroplating nails nails, holes dug in on both sides 4 centimeters deep groove at the bottom of filler from the start, each 20-25 cm for the layer, using linoleum separated from each floor should be inclined slightly outward to facilitate drainage, the edge should not exceed xylem, so that cambium in the formation of callus on it.

另外，也可用填充法修补树洞，填充物最好用小石砾和水泥的混合物，填充物必须压实，为加强填料与木质部的连接，洞内可钉若干电镀铁钉，洞口内两侧挖4厘米深的凹槽，填充物从底部开始，每20厘米至25厘米为一层，用油毡隔开，每层都要向外略斜，以利排水，边缘应不超过木质部，使形成层能在它上面形成愈伤组织。

Sodium citrate; calcium carbonate; calcium hydroxide; potassium bicorbonate; magnesium carbonate; ferrous sulphate; Zinc sulphate; copper sulphate; manganese sulphate; potassium iodide; sodium selenite.

柠檬酸钠；碳酸钙；氢氧化钙；碳酸氢钾；碳酸镁；硫酸亚铁；硫酸锌；硫酸铜；硫酸锰；碘化钾；亚硒酸钠。

All this to say that I'm glad filmmaking hasn't become completely ironic. I can enjoy an ironic film as much as the next person, but they usually involve a message of some sort. One that's delivered in a smirkingly clever way that requires little in the way of talent.

所有这些都是说，我很高兴电影制作没有变成完全讽刺艺术，我可以和下一个人一样享受讽刺电影的乐趣，虽然他们经常会被划归到一定级别，技术方面不需要很高的才能。