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Fromthese facts,It could be deduced that 8 to 14 pairs of chromosomes possessed a certaindegree of hetorology,which was directly groved to be hybrid origin of P.tomentosaaccording to the good chromosome homology and fertility of P.bolleana and thehybrids of P.tomentosa×P.bolleana,it could be further deduced that the original parentsof P.tomentosa involved probably P.bolleana or P.alba.

从终变期、中期I的染色体构型看,有数目不等的联会程度较差的单价体和棒状二价体出现,在后期I,甚至末期I亦可见到含落后染色体分裂相的细胞,由此推断可能有8~14对染色体表现出一定程度的异源性,鉴于新疆杨以及毛白杨与新疆杨杂交产生的杂种毛新杨的染色体同源性较强、育性较好等现象,进一步推断毛白杨起源亲本可能包括新疆杨或银白杨。

The cytogenetics of interspecific hybrids among the four cultivated cotton species were studied in this paper and results are as follows: The diploid interspecific hybrid (G. arboreum×G. herbacium) F〓 had a four-chromosome-ring at the meiotic metakinesis. The synapses of tetraploid hybrid (G. hirsutum ×G. barbadense) F〓 was found to be regular, which mainly formed bivalents, sometimes some univalents, multivalents and chromosome bridge.

四个栽培棉种间杂交种F〓的细胞学观察结果表明,F〓减数分裂中期Ⅰ,形成一个环状四价体,直接证明了亚洲棉与草棉之间存在一对相互易位;F〓减数分裂中期Ⅰ联会基本正常,主要形成二价体,偶尔出现一些单价体和多价体,以及染色体桥。

The database was composed of 18 dental treatments from January 1988 to December 2004. The 18 dental treatments included in this study as following: Amalgam fillings (single-, double-, and triple-surface), composite resin fillings of anterior teeth (single- and double-surface), composite resin fillings of posterior teeth (single-, double-, and triple-surface), glassionomer fillings, endodontic treatment (single-, double-, and triple-root), pulpectomy, full mouth scaling, simple tooth extraction, complicated tooth extraction, simple odontodectomy, complicated odontodectomy.

本研究以牙医十八项医疗项目为对象,资料来自中华民国牙医全联会所提供之健保申报资料档,共包含银粉填充、前牙复合树脂、后牙复合树脂、玻璃离子体填充、恒牙根管治疗、乳牙根管治疗、牙结石清除、简单性拔牙、复杂性拔牙、单纯齿切除术、复杂齿切除术等十八项。

Magnetic reconnection at different levels of the solar atmosphere may bring about different phenomena.

2太阳大气不同层中发生的磁重联会带来不同的观测效应。

Synaptonemal Complexes in Trionyx sinensis spermatocytes prepared with micro-spreading technique and silver staining was analyzed by electron microscopy.

本文以微铺展技术制备中华鳖精母细胞联会复合体标本,经硝酸银染色后电镜观察,分析了SC组型。

In order to enrich the programs and events of WCCA and provide you with the high quality services, we are very anxious for your voluntariness and contribution.

为了使华联会能更好的举办活动,为大家提供更优质的服务,我们热切的希望您的投入和赞助。

We have just got to make sure we win against United to bring back confidence.

我们相信战胜曼联会带给我们足够的信心。

But we couldn't even get the Intra-American group to join together in denouncing Castro.

而我们竟连泛美集团的联会谴责都没有实现。

The results showed that: at metaphase I, the homoeologous chromosome pairing among different F1 hybrids ranged from 2.0 to 11.4 bi-valents formed by homoeologous chromosomes per pollen mother cell, and very few multivalents, and even very few bivalents were formed by two chromosomes within one genome rather than homoeologous chromosomes in some PMCs; at anaphase I, all biva-lents were disjoined and most univalents were divided.

结果表明在中期I阶段,这些杂种一代的近缘染色体联会变化很大,每个花粉母细胞中二价体形成的数目从平均2个到11.4个不等,甚至在某些花粉母细胞中,还发现极少的多价体和非部分同源染色体所形成的单基因组内二价体;在后期I时,所有的二价体分离,同时多数单价体也分离,分离的二价体和分离的单价体都移向两极,从而形成两组染色体;因为这时完整花粉母细胞中分离的二价体在两组染色体中总是对应出现,从而根据半二价体上染色体重组的位置可以分析在二价体的四分体时期发生在非姊妹染色体之间的多种染色体交换类型,如单交换、三线双交换、四线双交换、四线三交换和四线多交换。

Mitchell gets hazed, he runs to the Vulcan's, the black firefighter society

Mitchell被整,他跑去了伏尔坎黑人消防员联会

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推荐网络例句

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。