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幼体变态
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  larval metamorphosis
     The result showed: when the concentration of ionized ammonia(NH 3-N m) exceeded to 0 11 mg/L over 6 days, larval metamorphosis would be delayed causing heavy larval mortality.
     结果表明 :水中NH3 -Nt、NH3 -Nm 与NO-2 -N无明显的日变化规律 ,但在整个育苗期间NH3 -Nt、NH3 -Nm 与NO-2 -N含量的变化呈逐渐上升的趋势 ,其变化与管理方式有关 . 在幼体发育期间 ,水中NH3 -Nm 的含量超过 0 11mg/L ,6d时 ,幼体变态时间延长、存活率低 .
短句来源
     Comparisons of egg size,fertilization rate,embryonic development rate,larval settlement rate,larval metamorphosis rate,larval survival rate and postlarval growth among four groups were made.
     对这些交配组合的卵径、受精率、胚胎发育速度、幼体附着率、幼体变态率、幼体存活率以及稚贝早期生长进行了比较.
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  “幼体变态”译为未确定词的双语例句
     The zo ea survival and metamorphosis rates of the crab reached the best level when the concentration of Ca 2+ was about 210mg/L and the ratio between Mg 2+ and Ca 2+ was 2.5~3 0:1.
     水质中Ca2 + 质量浓度约 2 10mg/L ,Mg2 + :Ca2 + =2 .5~ 3 0∶1时 ,河蟹幼体变态成活率最高
短句来源
     The Effects of Zn~2+ and Sr~2+ in Seawater on the Hatchability and Metamorphosis Rate of Artemia saline
     海水中Zn~(2+)(锌离子)和Sr~(2+)(锶离子)对卤虫卵孵化率和幼体变态率的影响
短句来源
     H-9 (Vibro), H-4 (Vibro) and H-7 (Lactobacillus) show inhibitory effects on the metamorphosis of larvae.
     弧菌属的H-9和H-4、乳杆菌属的H-7对幼体变态有抑制作用。
短句来源
     The survival rates from zoea to megalopa of the crab fed Inner-mongolia strain and Panjin strain were 71.65% and 62.50%,respectively.
     用内蒙品系轮虫投喂的蟹苗,幼体变态至大眼幼体的存活率为71.65%,用盘锦品系轮虫投喂的蟹苗,变态至大眼幼体的存活率为62.50%。
短句来源
     When larvae developed to the eighth day of post-larval (P8), the number of heterotrophic bacteria and vibtio in control′s pond waters is 6.33×105 and 3.55×104 CFU·mL -1 ,respectiveiy. It was well above the trails′.
     当幼体变态发育至仔虾第8天(P8)时,对照组异养菌总数和弧菌数量分别达6.33×105和3.55×104CFU·mL-1,均远远高于试验组的异养菌总数和弧菌数量增长的幅度。
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  相似匹配句对
     H-13 (Achromobacter). can facilitate the metamorphosis of ascidian larvae.
     无色杆菌属的H-13能诱导幼体变态
短句来源
     The effects of different diet on metamorphosis and development of Eriocheir si nensis zoeae larvae
     饵料对河蟹溞状幼体变态发育的影响
短句来源
     About the Metamorphosis of Amphibious Animals
     浅谈两栖类的变态
短句来源
     METAMORPHOSIS AND LIVING HABIT OF THE LARVAE OF THE SEA CUCUMBER STICHOPUS JAPONICUS SELENKA
     刺参幼虫的变态和习性
短句来源
     Regulation of molting in crustacean larvae
     甲壳动物幼体蜕皮的调控
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  larval metamorphosis
Special attention has been paid to some reports of larval metamorphosis controlled by marine bacteria.
      
Recolonization proceeded rapidly and was primarily by juvenile fishes well beyond larval metamorphosis.
      
were present, larval metamorphosis occurred within 2 h of settlement.
      
Among these glycolipids, SQMGs, MGMGs, MGDGs and DGMGs induced larval metamorphosis of the sea urchin S.
      
SQMGs and MGDGs induced larval metamorphosis at a concentration of 5?μg ml-1, whereas SQDGs and DGDGs only induced larval settlement.
      
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The effects of several ecologic factors on the larval development and survival rate of the sea cucumber Apostichopus japonicus (Selenke) are analysed and summarized on the basis of the data obtained in 1979-1986. The optimal larval density is about 5×105/m3. The optimal number of postlarvae on unit area substratum was 1.0 × 105-4.2×105/m2. The survival rate from larvae to postlarvae was 34-80.8%, but 82.4% survival rate was achieved by feeding the larvae with three species of unicellular algae, Disnaliella euchloin,...

The effects of several ecologic factors on the larval development and survival rate of the sea cucumber Apostichopus japonicus (Selenke) are analysed and summarized on the basis of the data obtained in 1979-1986. The optimal larval density is about 5×105/m3. The optimal number of postlarvae on unit area substratum was 1.0 × 105-4.2×105/m2. The survival rate from larvae to postlarvae was 34-80.8%, but 82.4% survival rate was achieved by feeding the larvae with three species of unicellular algae, Disnaliella euchloin, Dicrateria zhanjiangensis and Chaetoceros muelleri. The postlarvae adheres to the white PVC plate covered by benthonic diatoms. The shelf-shaped substratum made of PVC can provide larger space for 60-70% of postlarva in the pool to adhere to it. One ppm of dipterex is sufficient to kill harmful cope-pods.

本文根据1979~1986年间刺参人工育苗试验结果,综合讨论了多年培育刺参幼体中涉及的幼体密度、饲料类别、附着器材质等主要因子对幼体成活率及发育变态为稚参的影响。结果表明:把握好上述因子及参数,可提高幼体的变态率及稚参的单位面积(1m~2,下同)出苗量,确保良好而稳定的育苗效果。

A series of experiments on survival rate and gonad development of wintering prawns, Penaeus chinensis, feeded with compound diets were carried out. The results showed that the survival rates of the prawns feeded with compound diet were 92. 50% and 83. 33%, separately, in the first and second experimental stages, while the rates of the control prawns feeded with nereis and clams were 84. 17% and 81. 67% , and there were no significant differences between the compound feeded prawns and the control. Further practical...

A series of experiments on survival rate and gonad development of wintering prawns, Penaeus chinensis, feeded with compound diets were carried out. The results showed that the survival rates of the prawns feeded with compound diet were 92. 50% and 83. 33%, separately, in the first and second experimental stages, while the rates of the control prawns feeded with nereis and clams were 84. 17% and 81. 67% , and there were no significant differences between the compound feeded prawns and the control. Further practical tests gave similar results that the final survival rates of the compound feeded prawns and the control were 73. 61 % and 73. 33% respectively, and that the rates of prawns which gonad had developed to stage IV were 68. 0% for the compound feeded group and 58. 0% for the control group. Thus, both laboratory and practical experiments indicated that the compound feed was an applicable diet to substitude traditional diet of nereis and clams to wintering prawns.

通过两年度的小试和生产性试验,从越冬亲虾入池至产卵过程全部投喂人工配合饵料,其成活率和性腺发育要好于投沙蚕、四角蛤的鲜活饵料组(对照组),生产性试验的产卵量、孵化率和幼体变态率优于对照组。试验用饵的成本比对照组低45.3%。

The paper dealed with the effect of early period of starvation onthe larvae of M. affinis, the relationship between the starvation time and metamor-phosis time of the larvae, predation and energetics of larvae and postlarvae fee-ding on Artemia nauplii and Brachinous plicatilis and suitable food and food densityfor different stages of larvae. The significant effect of starvation on the development and metamorphosis oflarvae was observed in the laboratory. The relationship between the metamorphosistime of zoeal-Ⅰ...

The paper dealed with the effect of early period of starvation onthe larvae of M. affinis, the relationship between the starvation time and metamor-phosis time of the larvae, predation and energetics of larvae and postlarvae fee-ding on Artemia nauplii and Brachinous plicatilis and suitable food and food densityfor different stages of larvae. The significant effect of starvation on the development and metamorphosis oflarvae was observed in the laboratory. The relationship between the metamorphosistime of zoeal-Ⅰ larvae (Dr, hour) and the starvation time (t,hour) could be descri-bled as: Dt=36.88+1.37t(r=0.996). At temperature 28℃, the PNR-100(point ofno return) for zoeal-Ⅰ larvae was about 20 hours, PNR-50 about 12 hours, PRS(point of r oserve saturation) about 32 hours, PRS-50 about 20-24 hours. Zoeal-Ⅱlarvae began to ingest the rotifer B. plicatilis and the ingestion rate was found toincrease with progressive increase of larvae development, reached a peak duringmysis-Ⅲ larvae stage,then declined at PLI. Rotifer density being 30 cells/ml, themaximum ingestion rate was obtained. When the rotifer density was 10 cells/ml,the learvae's energy ingestion was 0.45, 0.38, 0.73, 0.58, 0.55 and 0.63 time asmuch as the maximum energy ingestion, respectively, during ZⅡ,ZIⅢ,MⅠ,MⅡ,MⅢ and PL I larvae stages. Both zoea and mysis larvae couldn't ingest Artemianauplii. Postlarvae-Ⅲ began to ingest. The daily ingestion and it's relationshipwith the temperature ware also studied. Chaetoceros calcitrans, Dicraterria zhangjiangensis and their combination withPlatymonas subcordiformis were all suitable food for Zoeal-Ⅰ larvae. The metamor-phosis rate would be obviously developed when the larvae were fed on the combina-tion of C. calcitrans, with B. plicatilis or with Spirulina sp. from zoeal-Ⅱ to mysis-Ⅰ stage The combination microalgae such as C. calcitrans,D, zhangjiangensis and P.subcodiformis were also suitable to culture the larvae from zoeal-Ⅰ to mysis-Ⅰ stage.Single fed on D. zhangjiangensis or P. subcodiformis, the zoea larvae couldn't deve-lop satisfactorily to mysis stage. But fed on P. subcodiformis at later stage of zoealarvae, the better survival of laeval developing to mysis stage could be obtained. At the stages of MI to PL I, the best survival and metamorphosis were obtained whenthe larvae fed on the combination of C. calcitrans with B. Plicatilis among the testfood organisms. The larvae could also develop well only fed microalgae incombination of C. catitrans with D. zhangjiangensis and P. subcodi formis. The suitableconcentrations of mieroalgae for culturing Zoeal-Ⅰ larvae were: C. calcitrans andD. zhangjiangensis 10×10~4--30×10~4 cells/ml, P. subcodformis 2×10~4-5×10~4cells/ml.

本文于1987、1988两年近缘新对虾的繁殖季节,研究了早期饥饿对近线新对虾幼体发育、变态的影响,饥饿时间与幼体变态时间的关系;幼体及后期幼体各阶段摄食卤虫无节幼体、褶皱臂尾轮虫数量的变化;幼体各阶段的适宜饵料种类及密度。

 
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