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  single pair
     The 901 protection and SF 600 can be connected with single pair of contact.
     901保护与SF—600可采用单对接点连接。
短句来源
     Seven families of the first generation of pearl oyster Pinctada martensii Dunker were established by using single pair mating and their growth traits were studied.
     采用单对配对方法建立马氏珠母贝Pinctada martensii第一代家系7个,对家系间的生长和家系内大小变异进行了分析比较。
短句来源
     Comparing single pair selection with mass selection, the resistance ratio to lambda cyhalothrin increased to 27.3 fold from the original 4.9 fold after 2 generations' single pair selection, whereas the resistance ratio to lambda cyhalothrin only increased to 7.4 fold from the original 4.9 fold after 2 generations' mass selection.
     结果表明 ,群体汰选两代后抗性倍数由 4 .9倍提高到 7.4倍 ,而单对汰选两代后抗性倍数由 4 .9倍提高到2 7.3倍。
短句来源
     A mechanical analysis model considering both the ligand surface concentration and the difference of molecular bonds' position was proposed, which finally gave the result that the average interaction force between a single pair of ligand and objective molecule was about 342pN.
     在受力分析模型中,考虑到多分子的结合,以及分子键位置不同造成的力臂长度的差异,最终计算得到单对配基与目标分子的平均结合力约为342pN.
短句来源
     The frequencies of alleles for kdr type resistance to cyhalothrin in field populations of Helicoverpa armigera collected from Xinjiang and North China were evaluated by single pair mating and hot probe method.
     通过单对杂交结合热探针法 ,研究比较了新疆与华北棉区田间种群棉铃虫对氯氟氰菊酯 kdr型抗性个体频率、抗性基因型频率和抗性基因频率的差异。
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  “单对”译为未确定词的双语例句
     F_1 population have JBW phenotype. In the F_2 generation, JBW/JBM was 3.1 to 1. In the BQ(♀JBM×♂F_1) generation, the ratio of JBW/JBM was 1.2 to 1. In the F_3 generation, no JBW phenotype appeared in 115 individuals.
     单对反交结果中,F_1均为JBW表型,在F_2代中,JBW表型与JBM表型比为3.1∶1,BC_1代JBW表型与JBM表型比为1.2∶1,F_3代和BC_1代的F_1代均为JBM表型。
短句来源
     In the F_2 generation, JBW/JBM was 3 to 1. In the BC_1(♀F_1×♂JBM) generation, JBW/JBM was 1.3 to 1. In the F_3 and F_1 generation of BQ, no JBW phenotype appeared. In one to one cross experiments of JBW×JBM(-);
     单对正交结果中,F_1代的181头后代均为JBW表型,F_2代JBW表型与JBM表型比为3∶1,BC_1代JBW表型与JBM表型比为1.3∶1,F_3代的109头后代均为JBM表型,BC_1代的F_1代的112头没有出现一例JBW表型。
短句来源
     Both steel grades Scr420H and 20 CrMnTi are comparatively tested on following items the tendency of crystal grain growth,manufacturability,bending of single tooth,fatigue life of a pair of gears and motor vehicle tests the test results show that steel SCr420H is one of the ideal Steel grades to be substituted for Steel 20 CrNnTi used for manufacturing gears of EQ140 truck transmissions.
     SCr420H钢与20CrMnTi钢的晶粒长大倾向、生产工艺性能、单齿弯曲、单对齿轮疲劳及装车等各项试验对比的结果表明,SCr420H是取代20CrMnTi用于EQ140变速器齿轮的较理想钢种。
短句来源
     After two generation selection, the LD_(50) to deltamethrin of SEW decreased from 0.0081μg/larva to 0.0053μg/larva.
     经过连续两次单对筛选,SEW对溴氰菊酯的LD_(50)由0.0081μg/头下降到0.0053μg/头。
短句来源
     LC-(50) value of Fenvalerate against relative sensitive strain obtained by single-pair mating screening for successive two generations decreased from 126.34μg/mL to 46.89μg/mL.
     经过连续2代单对筛选得到的相对敏感品系,其对氰戊菊酯的LC50从126.34μg/mL下降到46.89μg/mL;
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  相似匹配句对
     Based on the analysis of X.
     在X.
短句来源
     nigrum and P.melanostipes.
     P.
短句来源
     Symmetrical single microgap surge absorber
     微隙放电管
短句来源
     The Natural Selection of a Single Alleles—pair(A,a)
     基因(A,a)的自然选择
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     The Single-Electron Physics
     电子物理学
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  single pair
It was demonstrated that karyotype of each line included a single pair of rye chromosomes and lacked wheat-rye translocations.
      
The duration of different stages under different temperature regimes was expressed in the relative units of τ0 (the time of a single cleavage) and τs (the time of formation of a single pair of somites).
      
From behavioral studies of a bottlenose dolphin (Tursiops truncatus), the audibility thresholds were measured for a single pair of equal-amplitude pulses, i.e., clicks, presented to the dolphin in combination with a pulse jam.
      
The period ΔV of the structure is consistent with the Coulomb charging energy of a single pair, ΔV=e/C, where C is the effective capacitance of the stack.
      
Atomic force microscopy (AFM) measurements of intermolecular binding strength between a single pair of complementary cell adhesion molecules in physiological solutions provided the first quantitative evidence for their cohesive function.
      
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The present report deals with the preparation of crystalline 5′-O-mono-p-metho-xytrityl or 5′-O-trityl derivaitives of four common ribonucleotides [e.i.(MeOTr)Cp,(MeOTr) Up,(MeOTr)Ap,(Tr)Gp~(a)] through the direct reaction of the ribonucleoside3′-phosphate with mono-p-methoxytrityl ohloride or trityl chloride.We have foundmore satisfactory reaction conditions through changing the proportions of reagents,solvents,temperature and the time of reactions.It-should be mentioned that the keypoint of getting a crystalline...

The present report deals with the preparation of crystalline 5′-O-mono-p-metho-xytrityl or 5′-O-trityl derivaitives of four common ribonucleotides [e.i.(MeOTr)Cp,(MeOTr) Up,(MeOTr)Ap,(Tr)Gp~(a)] through the direct reaction of the ribonucleoside3′-phosphate with mono-p-methoxytrityl ohloride or trityl chloride.We have foundmore satisfactory reaction conditions through changing the proportions of reagents,solvents,temperature and the time of reactions.It-should be mentioned that the keypoint of getting a crystalline trityl-or mono-p-methoxytrityl-derivative is to choose anappropriate solvent or mixture of solvents.A mixture of anhydrous pyridinium cytidine-3′-phosphate(31 mmol) and mono-p-methoxytrityl chloride(155 mmol)in anhydrous DMF (700 ml) was stirred at 45℃until the mixture became clear (about 4 hrs.).After cooling,the reaction mixturewas added with a solution of concentric ammonium hydroxide (50 ml) in ethanol (120ml)under stirring,concentrated down (to 300 ml) under reduced pressure at below40℃,mixed with a 5% aqueous ammonium hydroxide solution (230 ml) and extractedwith ether (3×400 ml).The precipitate separated was collected and dissolved in a mix-ture of concentric ammonium hydroxide and ethanol (1:1) on warming.Isopropanolwas added until the solution became turbid,and the mixture was made clear again onwarming.After standing,ammonium 5′-O-mono-p-methoxytrityl 3′-phosphate wasobtained in colourless,needles (16. 2g.yield 80%).The other three crystalline derivatives [(MeOTr)Up,(MeOTr)Ap,(Tr)Gp~(a)] weresimilarly prepared employing different solvents or solvent mixtures for crystallisation(see Table 1) .The experimental data of the prepared crystalline products are shown in Tables1. 2 and 3.

本文报导了采用单对甲氧三苯甲基氯或三苯甲基氯与3′-单核糖核苷酸直接反应的方法,合成的产物通过适当的溶剂处理获得了结晶的5′-O-单对甲氧三苯甲基保护的3′-胞核糖核苷酸、3′-尿核糖核苷酸、3′-腺核糖核苷酸以及5′-O-三苯甲基保护的 N-乙酰基-3′-鸟核糖核苷酸等化合物,既简化步骤、缩短时间,又提高了产物的纯度和得率.

The present study is devoted to the identification and isolation of translocations in the mosquito Culex pipiens pollens Coq. Virgin female mosquitoes carrying genetic markers, recessive red eye (r) and black head (bh) were mated with wild males pretreated with X-ray radiation and the F1 obtained were individually backcrossed with red-eyed and black-headed ones. Among the group of individuals tested with reciprocal cross translocation strains were isolated and maintained. Two of them are M-linked and the two...

The present study is devoted to the identification and isolation of translocations in the mosquito Culex pipiens pollens Coq. Virgin female mosquitoes carrying genetic markers, recessive red eye (r) and black head (bh) were mated with wild males pretreated with X-ray radiation and the F1 obtained were individually backcrossed with red-eyed and black-headed ones. Among the group of individuals tested with reciprocal cross translocation strains were isolated and maintained. Two of them are M-linked and the two others m-link-ed. The translocation heterozygote strains showed different degrees of sterility, ranging from 53.1 to 71.5 per cent. The observations indicated that the sterility was due to lethality of the fertilized eggs.

相互易位能使生殖细胞分裂失常而导致部份不育,故可用来作为防治害虫的手段。我们用1000到8000伦琴的X射线,照射的羽化24到48小时的淡色库蚊(Culex pipiens pallens Coq.)的野生型雄蚊,诱发了性染色体和常染色体之间的相互易位。为鉴定并分离出这种相互易位,用未经交配的具有红眼(r)和黑头(bh)两种突变性状为标记的雌蚊与受照射的野生型雄蚊进行单对交配。F_1表现为野生型,BC_1由r与bh两种性状所表现的拟连锁r-bh及分离比例上的反常,分别从4000、5000、6000和8000伦琴的四个照射组中,各分离出一种相互易位杂合子。其中由5000和8000伦琴诱发所得为雄性连锁相互易位杂合子T~M,而由4000和6000伦琴诱发所得为雌性连锁相互易位杂合子T~m。都已育成稳定的半不育品系。四个品系的不育性为53.10%—71.50%。经详细观察,发现不育性的主要原因是受精卵的致死所造成。

In the paper careful investigations are made on teeth form factors Y_F and Y_Fa according to the methods f the calculation which is drafted withreference to the loading capacity of the involute spur and helical gears byISO/TC60/WG6 in the year 1978.Calculative operation has been carried outon the electronic computer.The ollowing pinions are expressed:1.Thereasonable style of the curves of teeth form factors;2.The methods of programdesigns n alculating teeth form factores Y_F and Y_(Fa);3.Some points to bedeliberated...

In the paper careful investigations are made on teeth form factors Y_F and Y_Fa according to the methods f the calculation which is drafted withreference to the loading capacity of the involute spur and helical gears byISO/TC60/WG6 in the year 1978.Calculative operation has been carried outon the electronic computer.The ollowing pinions are expressed:1.Thereasonable style of the curves of teeth form factors;2.The methods of programdesigns n alculating teeth form factores Y_F and Y_(Fa);3.Some points to bedeliberated in the formulas of calculating(h_F/m_n)nd(h_(Fa)/m_n).

本文根据1978年ISO/TC60/以WG6制订的渐开线圆柱齿轮承载能力的计算方法对弯曲强度计算时的齿形系数Y_F和Y_(Fa)进行了认真的探讨;并在电子计算机上进行了计算实践;提出了:1.齿形系数线图应有的合理格式;2.计算齿形系数Y_F和Y_(Fa)的程序设计方法;3.在ISO/TC60/WG6制订的方法求(h_F/m)和(h_(Fa)/m_n)的计算式中有待商榷之处。文中所用主要符号:Y_F——外侧单对齿啮合点时的齿形系数;Y_(Fa)——齿顶端点受载(不修缘)时的齿形系数;h_F——外侧单对齿啮合点时的弯曲力臂;h_(Fa)——齿顶端点受载(不修缘)时的弯曲力臂;S_(Fn)——齿根危险剖面的法面齿厚;α_n——法面压力角;α_t——端面压力角;α_(en)——过外侧单对齿啮合点的齿纹法截面内作用力与轮齿中线的垂线间的夹角;α_(an)——齿顶端点受载(不修缘)时齿纹法截面内作用力与轮齿中线的垂线间的夹角;ρ_(ao)——刀具齿顶园角半径;X——变位系数;β——分度圆柱上的螺旋角;β——基圆柱上的螺旋角;P_(bc)——端面基节;ε_α——端面重合度

 
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