查询词典 taxonomic

Its taxonomic position, as understood by various authors, was very obscure—from a mere section in Chenopodium to the sole genus of a separate family Dysphaniaceae—but its close affinity to "glandular" species of Chenopodium s.l.

它的分类的位置，象由各种各样的作者理解的那样，很不明显——从Chenopodium的仅一个组到单独属的科Dysphaniaceae——但它很明显与具&腺&的种Chenopodium s.l。

The major secondary metabolic products of all Chinese Cladonia species were determined by mean of thin-layer chromatography . Nineteen lichen substances are reported and the combination of these substances is used as one of the taxonomic characters.

用薄层色谱法测定了中国石蕊属地衣所有种类的次生代谢产物，共测出19种地衣物质并将其在不同种中的不同组合或是否存在作为分类特征之一。

Taxonomic studies on the Cornaceae of Zhejiang.

浙江山茱萸科植物的分类。

This phenomenon warrants further study. 4. Phylogeny study on Croomia and Stemona The relationship of the genus and the taxonomic placement of Stemonaceae The phylogenetic tree of matK, trnL-F, atpB-rbcL and ITS sequences data indicated that it was natural to place Stemona and Croomia in one family.

黄精叶钩吻属和百部属的分子系统学研究百部科属间关系和科的系统地位叶绿体DNA(matK、trnL-F和atpB-rbcL)及核DNA序列构建的系统树显示Stemona和Croomia形成稳定的单系类群，表明将这两个属放在同一个科是自然的，不支持将Croomia独立成科。

Using nuclear DNA C-values for 539 angiosperms in China, we examined the variation of these values among growth forms and taxonomic groups and the relationship of these values with invasiveness. Mean DNA C-value of the 539 angiosperm species was 4.06 pg. Mean DNA C-value was(1) significantly lower for woody species (1.84 pg) than for herbaceous species(5.02 pg);(2) significantly lower for 360 dicots (2.20 pg) than for 179 monocots (7.80 pg);(3) significantly lower for annuals (2.78 pg) than for perennials(6.65 pg);(4) significantly lower for 134 weed species (1.93 pg) than for herbaceous non-weeds (6.75 pg) and for several families that have an unusually high proportion of weed species;(5) significantly lower for 47 exotic weed species (1.76 pg) than for 134 native weeds (1.93 pg), but significantly lower than that of "non-weedy" herbaceous species (6.75 pg);(6) lower for weeds than for "non-weedy" species in same genus or family; and (7) in herbaceous species, generally lower for weedy compared to "non-weedy" species, with some exceptions such as Avena fatua, whose DNA C-value is as high as 14.15 pg, contrarily, and some "non-weedy" herbaceous species in Cruciferae and Cucurbitaceae with very low values.

统计了中国境内有分布的539种被子植物的DNA C-值，分析了它们在不同分类群、生活型、倍性、生活史类型以及在杂草和非杂草类群中的分布情况，主要结果如下：(1)539种被子植物DNA C-值平均为4.06 pg，其中木本植物的DNA C-值平均为1.84 pg，低于草本植物的平均值(5.02 pg)；(2)双子叶植物(360种)的DNA C-值平均为2.20 pg，极明显地小于单子叶植物(179种)的平均值(7.80 pg)；(3)1年生植物的DNA C-值平均为2.78 pg，明显小于多年植物的平均DNA C-值(6.65 pg)；(4)134种杂草的DNA C-值平均为1.93 pg，明显小于非杂草草本植物的平均值(6.75 pg)，含杂草较多的科，平均DNA C-值相对较小；(5)统计的47种入侵杂草的DNA C-值平均为1.76 pg，略小于134种杂草的平均DNA C-值(1.93 pg)，极显著地小于非杂草性草本植物(6.75 pg)；(6)以科为单位，不同科的DNA C-值存在着极大的差异；(7)DNA C-值与染色体倍性的关系并不明显，但是，随着倍性的增加，基因组变小；(8)在同一科、属中，与非杂草相比，典型杂草的DNA C-值往往偏小；(9)总体上杂草或杂草性强的植物，它们的DNA C-值比非杂草性植物的要小。

Finally, authors discussed the taxonomic identification of three species of Cuscuta.

讨论了几种菟丝子侵染薇甘菊的发现及其分类鉴定特征。

Keywords: Dipterocarpaceae; Phylogeny; Evolution; New taxonomic system; Systematic arrangement; Geographic distribution

龙脑香科；系统发育；进化；新分类系统；系统排列；地理分布

Vegetation types in mountainous area of West Lake4 groups of vegetation type, 7 vegetation types, 14 formation groups and 25 formations were present in mountainous area of West Lake, according to taxonomic approach and divisory principle in Vegetation of China and Forest of Zhejiang.

西湖山区森林植被类型根据《中国植被》和《浙江森林》的划分原则和分类系统，采用高级分类单位以生态外貌为主、中低级单位采用优势种和标志种相结合的原则，把西湖山区的各类森林划分为4个植被型组、7个植被型、14个群系组和25个群系。

The monotypic genus Macrovalsaria previously of uncertain taxonomic position turns out to be a member of Botryosphaeriales and seems to be related to Botryosphaeria. The placement of Neopeckia and of Dothidotthia is in Dothideales and Botryosphaeriales, respectively. The genera Plowrightia and Botryosphaeria as currently defined are not monophyletic. Species of Plowrightia appear to be associated with three genera, Dothidea, Neopeckia and Sydowia; those of Botryosphaeria tested are recognized as three groups.

结果还显示，座囊菌纲中分类地位不确定的属Macrovalsaria与Botryosphaeria的关系相对接近，应该归于葡萄座腔菌目；历史上分类地位有疑问的Neopeckia和Dothidotthia两个属处于不同的目中，前者属于座囊菌目，后者为葡萄座腔菌目的成员；座囊菌目的Plowrightia属并非单系群，该属成员分别与Dothidea、Neopeckia和Sydowia三个属聚类在一起；现行的Botryosphaeria属也非单系群，其属的概念有待澄清。

Objective To observe the tegumental ultrastructure of egg,cercariae and the adults of Echinostoma Miyagawai may provide information for its taxonomic studies and its biological characteristic.

陈欣目的观察宫川棘口吸虫虫卵、尾蚴及成虫的体被超微结构，为其分类及其生物学特性的进一步认识提供资料。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。