查询词典 observations

In nine observations and mensurations from 3 June to 7 July, the relationship of fresh, dry biomass and diameter of fruits took on some rules in east, south, west and north, namely, and power or exponential allometry, and linear isogony, which were significant and very significant.

自6月3日至7月7日9次观查和测定中，在东、南、西和北四个方位上，黄刺玫的果实干鲜重和其果球径间的关系均呈一定的规律性变化，或呈幂函数或指数函数的异速生长或呈直线函数的同速生长，且均达到显著或极显著水平。

During the postgenomics era the information about genomic sequence and gene functions provides a new foundation for evolutionary biology and ecology As the first whole-genome sequenced plant Arabidopsis thaliana and its wild relatives have played a critical role in understanding the evolution of genomics and speciation Both A halleri and A lyrata are closely related to the model species A thaliana A halleri ssp gemmifera occurs in northeastern China Japan and Taiwan; while its sister A halleri ssp halleri is mainly distributed in Europe Geographical barriers such as Tienshan Mountain Range isolate these intraspecific sisters Likewise A lyrata ssp kamchatica and ssp lyrata occur in East Asia and North America respectively Such distribution patterns seem to be consistent with allopartic speciation The comparison between ancestral and extant polymorphism by multilocus can be informative about the population genetics of speciation In this study we collected and analyzed DNA sequences of 98 genes from four wild relatives of A thaliana A halleri ssp gemmifera A halleri ssp halleri A lyrata ssp kamchatica and A lyrata ssp lyrata The ancestral states of these four species were compared to each other in terms of level of genetic variation However the ancestral species at the time of speciation were substantially more polymorphic than the extant geographical populations The observations are not fully compatible with speciation by strict allopatry At some species pairs parapatric speciation seems more reasonable in speciation of Arabidopsis The 98 gene sequences are also used for the congruence test between gene genealogy and species phylogeny Only 28 genes support the species phylogeny but there are 23 genes supports another major genealogy { lyrata} thaliana Based on the phylogenetic position change of A lyrata ssp kamchatica and Ks value for each species pair suggested the recent directional gene flow between A halleri ssp gemmifera and A lyrata ssp kamchatica

阿拉伯芥是第一个完成基因体定序的开花植物，其基因体资讯提供植物学研究的重要依据；在解析阿拉伯芥属物种的亲缘关系以及种化机制等重要的演化议题时，阿拉伯芥近缘的野生物种自然成了不可或缺的关键；跟阿拉伯芥近缘的物种包括A halleri及A lyrata，其中A halleri ssp gemmifera主要分布於中国东北、日本以及台湾，与近缘的A halleri ssp halleri其分布於欧洲隔著天山及大陆的障蔽，而A lyrata ssp kamchatica主要分布於东北亚及台湾，与分布於北美五大湖的A lyrata ssp lyrata被北极圈所分隔，这样的分布模式暗示异域种化的可能。藉由多基因分析比较祖先物种与现生物种遗传歧异度的相关可提供讯息探讨种化时期的族群遗传结构，本研究针对A halleri ssp gemmifera、A halleri ssp halleri及A lyrata ssp kamchatica、A lyrata ssp lyrata四个物种，两对互为亚种的姊妹群，以阿拉伯芥为外群进行研究，在四个物种完成98个同源基因的分子序列，利用套装软体MCMCcoal来估算祖先物种的遗传变异，亦估算现生物种的核苷酸歧异度，观察到？多物种配对中祖先物种遗传多型性大於现生物种DNA歧异度，显示异域种化模型并无法完全解释阿拉伯芥属物种的种化模式，在某些物种配对间邻域种化模式应比异域种化更为可能；在基因树与物种树的比较，98个基因片段的亲缘模式只有28个是与已知物种树一致的，有23个基因其树状图支持{ lyrata} thaliana的型式，藉由kamchatica位置的变化以及估算各物种配对间的平均同义置换率，推测在A halleri ssp gemmifera与A lyrata ssp kamchatica间具有近代的单方向基因交流。

These observations are lending strength to an alternative hypothesis: that the gaseous giants detected so far formed elsewhere and have since spiralled towards the stars they now orbit.

这些发现有力地支持了另一种假设：迄今所发现的气态巨星是在其他地方形成的，并且朝现行轨道绕行的恒星螺旋状前进。如果

With the rapid development of satellite observations, we can use the altimetry geoid to study submarine tectonics and geodynamics.

由于卫星观测技术的发展，现在已能利用测高大地水准面简捷可靠地研究海底构造与动力问题。

Altruist theories in evolutionary biology were contested by Amotz Zahavi, the inventor of the signal theory and its correlative, the handicap principle, based mainly on his observations of the Arabian Babbler, a bird commonly known for its surprising altruistic behaviours.

提示："固定链接"为您显示此篇文章的固定不变链接，如果您有还有疑问请点击帮助评论想第一时间抢沙发么？搜狐白社会推荐：偷菜过时，来梦幻城盖楼送真房|心理测试：你还有几次恋爱机会？|每日一测：看看未来的你是小财神还是穷光蛋？您还未登录，只能匿名发表评论。或者您可以登录后发表。

Objective: To analyze the clinical observations about amalgam post and core of molar .

目的：对银汞桩核用于磨牙修复进行临床观察和分析。

The conditions for inducing pollen embryoids and calluses and the cytological observations of androgenesis in wheat have been studied.

本工作对小麦花粉胚和愈伤组织的诱导条件和雄核发育的细胞学现象作了研究。

Our theory has successfully explained a serious of experimental observations and predicted several new types of photoelectron angular distribution.

研究发现，复合相位Bessel函数的性质决定了光电子角分布的主要特点及其随激光强度、频率以及光电子能量的演化。

Anthropology is a science in that anthropologist use a rigorous set of methods and techniques to document observations that can be checked by others.

人类学是一门科学，它是人类学家用一套严格的方法和技术记载被他人核查的观察结果。

The Antitype is a three-dimensional typeface, a project that started from the observations that at least 50% of each character of the alphabet could be relieved without loosing its recognition.

非字型是一种3D字体，这个系列作品是开始於我观察到，每个字母至少都有一半可以被浮雕且不会失去字体的辨识度。

Warden: That's a beautiful dog, but don't bring her again.

那是条漂亮的狗，但是不要再把她带来了。

You get up in the morning – no hangover!

你第二天早上起来的时候—不会宿醉！