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三龄
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  third instar
     The regression equation for the martal rate of the infected third instar larvae is y=2.94+0.46x,and Lc_(50)value is 3.16×10~4PIB/ml.
     感染三龄幼虫死亡率回归直线方程为:y=2.94+0.46x。 Lc_(50)值为3.16×10~4PIB/毫升.
短句来源
     The first instar duration are 13.8±1.8 and 12.2±0.8 days in two generations separately, the second instar 5.8±0.9 and 5.0±1.2 days, the third instar 8.4±1.2 and 6.5±0.7 days respectively.
     一、二代各龄若虫平均历期,一龄分别为13.8±1.8和11.2±0.8天,二龄分别为5.8±0.9和5.0±1.2天,三龄分别为8.4±1.2和6.5±0.7天。
短句来源
     The LC_(50) values of the wild and clone isolates for early third instar H.armigera larvae were 2.987×10~4 PIBs/mL and 1.647×10~4 PIBs/mL respectively;
     它们对中国棉铃虫三龄初幼虫的LC_(50)值分别为2.987×10~4 PIBs/mL和1.647×10~4 PIBs/mL;
短句来源
     The results of bioassay showed that when P_(f)NPV was fed to the larvae at the third instar, its median lethal concentration (LC_(50)) was 5.93×10~(4)PIB/ml;
     用P_fNPV喂饲三龄幼虫,致死中浓度(LC_(50))为5.93×10~4PIB/ml;
短句来源
     3. When the third instar larvae were fed with leaves treated with spinosad at 0.1, 0.25, 0.8mg/L, the respiratory rate and maintain time increased along with dose increasing.
     3.用0.1、0.25、0.8mg/L多杀菌素处理甜菜夜蛾三龄幼虫,与对照相比,试虫呼吸代谢随药剂浓度升高明显增强,而且呼吸强度维持较高水平的时间延长。
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  three year old
     The total amino acids of one year old, two year old and three year old Lateolabrax japonicus account for 76.62%, 75.11% and 73.78% of dry weight respectively (average 75.17%), and the essential amino acids account for 40.10%, 39.02% and 36.69% respectively (average 38.60%).
     鲈鱼肌肉的氨基酸总量占肌肉干重百分比在一龄、二龄和三龄养殖鲈鱼中分别为 76 .6 2 %、75 .11%和 73.78% ,平均为 75 .17% ,必需氨基酸分别为 4 0 .10 %、39.0 2 %和 36 .6 9% ,平均为 38.6 0 % .
短句来源
     The content of fatty acids in 1g wet muscles of one year old, two year old and three year old Lateolabrax japonicus were 22.10 mg, 20.65 mg and 13.42 mg respectively (average 18.72 mg), the contents of polyunsaturated fatty acids (PUFA) were 10.19 mg, 7.57 mg and 2.54 mg,with average of 6.77 mg.
     每克肌肉 (湿重 )含有脂肪酸总量在一龄、二龄和三龄养殖鲈鱼中分别为 2 2 .10mg、2 0 .6 5mg和 13.4 2mg ,平均为 18.72mg ,其中PUFA总量分别为10 .19mg、7.5 7mg和 2 .5 4mg ,平均为 6 .77mg .
短句来源
     The contents of moisture, protein, lipid, amino acids and fatty acids of the muscles of one year old (average weight 1.22 g), two year old (average weight 265 g) and three year old (average weight 1 094 g) cultured Lateolabrax japonicus were measured.
     对平均体重为 1.2 2g、2 6 5g和 10 94g的一龄、二龄和三龄养殖鲈鱼肌肉中的水分、蛋白质、脂肪及氨基酸和脂肪酸含量进行了分析 .
短句来源
  “三龄”译为未确定词的双语例句
     The sex ratio of female to male was 1 : 1. 06. The width of headcapsule for the each instar were 11. 32±5.49,19. 8±0. 29,21. 45±0. 32,29. 79±3. 6,43. 88±14. 29mm, respectively.
     雌雄成虫性比为1:1.06.樗蚕的一龄、二龄、三龄、四龄、五龄幼虫平均头壳宽分别为11.32±5.49,19.8±0.29,21.45±0.32,29.79±3.60,43.88±14.29mm.
短句来源
     Bioassay conducted in the laboratory showed that the medium lethal concentration(LC50) was 1.4× 104,8polyhedra / ml, y= 3.24+0.54x.
     对三龄幼虫的致死中浓度(LC_(50))为1.4×10~(4.8)个多角体/ml,y=3.24+0.54x.
短句来源
     The results of bioassay indicated that the LC 50 of 2nd and 3rd instar of Spodoptera exigua was 6.6 ×10 4 and 2.6×10 5 PIB/ml.
     生物测定的结果表明其对二龄、三龄甜菜夜蛾的LC50 分别为 6 .6× 10 4,2 .6× 10 5PIB/mL .
短句来源
     Toxicity bioassay showed 4Q7(pHcy1) and 4Q7(pHcy3) exhibited a comparable mosquito-larvicidal activity against 3~(rd)-instar Culex quinquefasciatus.
     另外,生物测定结果表明重组菌株4Q7(pHcy1)和4Q7(pHcy3)对三龄致倦库蚊的杀虫活性没有显著性差异。
短句来源
     The ID_(50)andLC_(50)for the 3rd-instar larvae of cotton bollworm eliothis armigerawere 143.4 spores/larva and 1.27×10~6 spores/larva respectively.
     微粒子虫对棉铃虫三龄幼虫的ID_(50)和LC_(50)分別为143.4孢子/幼虫和1.27×10~6孢子/ml。
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  third instar
Female wasps lay a single egg into a second or third instar fly maggot developing in blueberry, hawthorn, or apple fruit.
      
Previous studies have confirmed the ability to extract ingested DNA from the alimentary tract of third instar blowfly larvae.
      
The minimal feeding period necessary to complete development was 48 hours at 25°C; the larvae must have reached the third instar.
      
Chrysopa nigricornis Burm, exhibits a facultative diapause during the third instar within the cocoon.
      
The first, second, and free-living third instars must experience short-day (LD 12 : 12) for diapause to occur; however, the third instar within the cocoon and the egg appear to have no role in diapause induction.
      
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  three year old
Case Report: The authors describe a twenty-three year old female patient with CRPS type II after damage to the left sciatic and tibial nerves.
      
We report voluntary dislocation of both hips in a three year old girl which gradually resolved without treatment.
      
GPI deficiency was detected in a three year old girl of Morrocan origin suffering, since birth, from hemolytic anemia.
      
A three year old, alkaloid producing cell line of Catharanthus roseus, maintained at 25°C, was grown on 2% sucrose at various temperatures from 10° to 45°C.
      
In a twenty-three year old female patient cardiac function had been inconspicuous, apart from tachycardia, but the ECG showed S-T segment depression and flat T waves.
      
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The reactions between O,O-diethyl-dithiophosphoric acid and diethylmercury,and between

二硫代磷酸 O,O-二烃基酯或其汞盐与二乙基汞很顺利地进行下列反应:(?) (?)这两个反应可利用来制备各种二硫代磷酸 O,O-二烃基酯乙基汞盐。这里制备了九种同系物。在报告Ⅱ中所制备的二硫代磷酸 O,O-二β-萘基酯,表现有2,4-D 类型的植物刺激作用,双-(O,O-二烃基硫磷酸酯)二硫物的杀虫(粘虫三龄幼虫)及杀菌(Alternariatenius)效能均甚微弱。但是本报告中所制备的二硫代磷酸 O,O-二烃基酯乙基汞盐同时具有杀虫(粘虫的三龄幼虫)及杀菌(Alternaria tenius)的效能。其中有六种,如以含汞量计,它们的杀菌效能较氯化乙基汞为强。

In order to test the tactic response of the cotton bollworm, Heliothis ammigera(Hubner), to the odors of its preferred host plant, certain volatile substances known tobe present in the cotton plant such as methanol, trimethylamine and vanillic acid werechosen as olfactory stimulants. It was found that the larvae in the early three instarswere attracted by the vapors of vanillic acid and trimethylamine in various degrees, butmethanol vapor had a repellent effect. These vapors were emitted from aqueous solu-tions...

In order to test the tactic response of the cotton bollworm, Heliothis ammigera(Hubner), to the odors of its preferred host plant, certain volatile substances known tobe present in the cotton plant such as methanol, trimethylamine and vanillic acid werechosen as olfactory stimulants. It was found that the larvae in the early three instarswere attracted by the vapors of vanillic acid and trimethylamine in various degrees, butmethanol vapor had a repellent effect. These vapors were emitted from aqueous solu-tions at the concentrations of 0.006 M 0.02 M and 0.03 M respectively. By using thesugars, free amino acids and vitamins which were shown to be present in the cotton plantas gustatory stimulants and incorporating them separately in the agar-based media, it wasfound that at the concentration of 0.02 M sucrose and fructose had a definite phago-stimulating effect, glucose was less effective, and xylose was indifferent. At low concen-trations, only DL-alanine among the five amino acids tested had some phago-stimulatingeffect, and ascorbic acid at 0.01 M was phago-inhibitive. These results show that thecotton bollworm as a polyphagous species responds differently to the individual com-ponents of the host plant which may act either as attractants or repellents, phago-stimulants or phago-inhibitors. Different species and varieties of cotton plants and some descendants from thehybridization between cotton and some other malvaceous plants such as Hibiscus palus-tris,H. mutabilis, Malva sylvestris and Althaea rosea were used to test the tactic andfeeding responses of the cotton bollworm. It was found that when the larvae had thechance to choose their food, they were more readily attracted to the leaves of Gossypiumhirsutum and certain variety of G. barbadense, but not so readily to some of the hybriddescendants, some of which may even show repulsive properties in the test. In thisrespect different varieties of H. barbadense also had different effects. When there wasno chance to choose their food, the larvae were observed to consume different quantitiesof foliage from different plants in a definite period of time and to become conditionedto the host plants with which they were brought up. Simultaneous chemical analysis showed that the water content as well as the total andprotein nitrogen contents of the cotton leaves gradually decreased as growth proceeded.The total nitrogen content also dropped when the squares developed into flowers, andthe protein content was found to reach the maximum when the squares had attained alength about 2.5 cm. The total and protein nitrogen contents of the bolls dropped asthe latter grew and aged. The total and protein nitrogen contents of the leaves seemedto be the highest as compared with those of the squares and bolls. The quantities ofsoluble and reducing sugars of the young leaves exceeded those of the tender and oldleaves, but the sugar contents of the bolls were found to be much higher than those ofthe leaves. The sugar contents of the squares were relatively low. In spite of these disparities, it was possible to grow the larvae after hatching into maturity separately andsolely on the leaves, squares and bolls of the cotton plants. In these rearing experi-ments, the cumulative quantities of food consumed, the rates of development and mor-tality, and the weights of pupae thus obtained were found to be conspicuously different.It is interesting to note that the larvae during the whole course of development wouldconsume the old leaves to an amount which may double the total quantity of the foodconsumed when the young leaves were offered. When the bolls were used as food thecumulative quantity consumed exceeded several times that when the leaves were used.This difference is presumably attributed to the differences in the water and sugar con-tents of the different organs of the cotton plant, as already shown that sugars usuallywould evoke a strong phago-stimulating effect. The general impression is that the plantorgans which have the higher sugar and water contents usually have a better nutritiveeff

本工作选用棉花不同器官所含有的几种化学成分作为嗅觉和味觉刺激剂,测验棉铃虫对它们的反应;结果表明一至三龄的幼虫对甲醇三甲基胺、香草酸等的趋性不同,四龄幼虫对不同的糖类、氨基酸等的取食反应也各不一。这说明幼虫对食料植物中的个别化学成分有感觉辨识的能力。用不同品种的海岛棉、陆地棉、以及棉花和其它锦葵科植物杂交所产生的后代的叶片来试验棉铃虫对它们的趋性和取食反应,结果表明当有选择的机会时幼虫对陆地棉和一定品种海岛棉有较强的趋性,对某些杂交后代的趋性很弱。在不能选择的条件下棉铃虫在一定时间内对不同种类或品种的棉叶的取食量也不相同,并对原来的食料植物可形成条件化。 曾对棉花不同器官的含水量、含氮物质和糖类进行了测定,同时分别用叶、蕾和铃将新孵化的幼虫饲养到老熟。幼虫取食不同器官时的累积食量、发育速度、死亡率,和变成的蛹的重量均有明显的差别。当以大叶为食时幼虫的总食量超过以嫩叶为食时的一倍以上;以铃为食时总食量可为以嫩叶为食时的数倍。这种差异可能是因铃中水分和含糖量较高,对幼虫的取食发生强烈的助长作用所造成的。因此,同株植物上含糖和含水缺多的器官对棉铃虫似乎有较好的营养效应,而这种效应可能是通过糖类等的味觉刺...

本工作选用棉花不同器官所含有的几种化学成分作为嗅觉和味觉刺激剂,测验棉铃虫对它们的反应;结果表明一至三龄的幼虫对甲醇三甲基胺、香草酸等的趋性不同,四龄幼虫对不同的糖类、氨基酸等的取食反应也各不一。这说明幼虫对食料植物中的个别化学成分有感觉辨识的能力。用不同品种的海岛棉、陆地棉、以及棉花和其它锦葵科植物杂交所产生的后代的叶片来试验棉铃虫对它们的趋性和取食反应,结果表明当有选择的机会时幼虫对陆地棉和一定品种海岛棉有较强的趋性,对某些杂交后代的趋性很弱。在不能选择的条件下棉铃虫在一定时间内对不同种类或品种的棉叶的取食量也不相同,并对原来的食料植物可形成条件化。 曾对棉花不同器官的含水量、含氮物质和糖类进行了测定,同时分别用叶、蕾和铃将新孵化的幼虫饲养到老熟。幼虫取食不同器官时的累积食量、发育速度、死亡率,和变成的蛹的重量均有明显的差别。当以大叶为食时幼虫的总食量超过以嫩叶为食时的一倍以上;以铃为食时总食量可为以嫩叶为食时的数倍。这种差异可能是因铃中水分和含糖量较高,对幼虫的取食发生强烈的助长作用所造成的。因此,同株植物上含糖和含水缺多的器官对棉铃虫似乎有较好的营养效应,而这种效应可能是通过糖类等的味觉刺激来增加取食量所造成。

Serica orientalis Motschulsky is one of the most important insect pests of forest andnursery in the Northeast China. The host plants include 149 species in 45 families, 116genera. The adult infests the bud, leaf and flower, causing a considerable damage tothe plant. According to the results recorded in the laboratory and also observed in the fieldduring 1958 in the west of Liaoning, the development of one generation of this beetlelasts one year. The earliest appearance of the adult in the field is in early April,...

Serica orientalis Motschulsky is one of the most important insect pests of forest andnursery in the Northeast China. The host plants include 149 species in 45 families, 116genera. The adult infests the bud, leaf and flower, causing a considerable damage tothe plant. According to the results recorded in the laboratory and also observed in the fieldduring 1958 in the west of Liaoning, the development of one generation of this beetlelasts one year. The earliest appearance of the adult in the field is in early April, butthe season of adult abundance in the field is from late April to the end of May. Thenumber of the adult emerging from underground is influenced by the local weatherconditions, of which precipitation and relative humidity are the most important factors.During the period when the adults are abundant, much precipitation and higher relativehumidity are favorable for the appearance of adults to damage the plants. Egg laying of the females begins in the middle decade of May to the first decadeof August. The maximum oviposition rate (50%) occurred in the last decade of Mayto the first decade of June. But the eggs deposited later than July cannot develop topupae and only survive to the first or second instar larvae. The number of eggs laid by each female is largely influenced by the condition ofthe host plants, among which leaves of Ulmus pumild L. are most favorable for ovi-position. The larval stage possesses three instars. The length of the first instar is on theaverage 19.29 days, second instar 14.96 days and third instar 31.42 days. The verticaldistribution of the first and second instar larvae is in generally 15--25 cm. underground,which is influenced by soil temperature. The favorable soil temperature for the activityof larvae is between 22--25℃. The mature larvae enter into the ground and formoval-shaped pupual chamber. The adults, after emergence at the end of August, do not appear to the surface ofthe ground in the same year. Though sometimes a few adults may appear to the surfaceof the ground and take host plant leaf for their food in the same year, these adults can-not copulate and lay eggs. The adults overwinter about 40--60 cm. underground.

黑绒金龟子为防护林区主要害虫之一,在东北地区每年发生一代,以成虫在土中越冬,越冬成虫4月上旬出土,4月下旬到5月下旬为发生盛期,成虫的发生消长和一定温度有关外,更大程度和降雨量、湿度关系更为密切,在通常情况下其发生高峰和多雨季节相吻合。成虫食性复杂,不同饲料对其取食量、产卵量、产卵期有很大影响,对于榆树叶的取食量最大、产卵量最多、产卵期也最长,其余树种则次之。幼虫有3龄,平均第一龄期19.29天,第二龄期14.96天,第三龄期31.42天。22—25℃温度范围的土层适合于1—2龄幼虫的活动。老熟幼虫潜入深层化蛹,蛹期一般为半个月,羽化后成虫在土中有升降活动,当年一般不出土,少数个体虽有出土活动或取食但不交配产卵。黑绒金龟子由于不同发育阶段受到不同温度的影响,在土层中有不同深度的分布。部分成虫可以经二次越冬,但第二次越冬后的成虫是否能正常产卵繁殖还有待进一步研究。

 
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