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nutrition ingredients
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The influence of carbon dioxide, temperature and several nutrition ingredients such as calf serum on the development of O. columbianum in vitro was studied.1. Stimulation of 0.06% sodium hypochlorite solution enabled 99% of sheathed Ls of O. columbianum to be exsheathed rapidly and it was found that the longer the larvae were stored, the shorter the duration of exsheathing process.2. The larvae showed no signs of development at 34ccccccccccccccccc and died rapidly at 41.5cccccccccccccc. At temperature...

The influence of carbon dioxide, temperature and several nutrition ingredients such as calf serum on the development of O. columbianum in vitro was studied.1. Stimulation of 0.06% sodium hypochlorite solution enabled 99% of sheathed Ls of O. columbianum to be exsheathed rapidly and it was found that the longer the larvae were stored, the shorter the duration of exsheathing process.2. The larvae showed no signs of development at 34ccccccccccccccccc and died rapidly at 41.5cccccccccccccc. At temperature ranging from 37 to 39.5cccccccccccccccccccc the rate of development and the yield of L4 showed a direct bearing on the rise of temperature, the optimal temperature is 39.5ccccccccccccccccc.3. The effect of CO2 on the development of O. columbianum in vitro was characterized by the promotion of synchronization of development and the yield of L4. However the trigger mechanism was not obvious.4. Calf serum supported growth and development of the worm in vitro better than both chicken embryon extract (CEE) and sheep serum. Comparison of the effects of CEE, DEE and REE proved CEE to be optimal. Culture systems containing REE did not support growth and development and the differences between CEE and DEE were non-significant.5. The growth and development rate of L3 in culture system containing medium F12 could be comparable to those in their natural host. The 12 culture systems (2-13) supported good yield of L4, 90% or more of the L3 metamorphosed into L4. The largest worm obtained from culture measures 2672uuuuuuuuuuuuuuum*****************148uuuuuuuuuuuuuuum(late L4).6. Sheep faecal extract did not support growth and metamorphosis from L3 to L4 of O. columbianum in vitro.7. In all growth studies, the worms were observed and counted. The results of growth and metamorphosis showed similarities. In all the culture systems, worms showed the same behavior and vivid movement, but the growing rate varied with different media.

本文研究了二氧化碳、温度、犊血清和鸡胚提取物等对哥伦比亚食道口线虫(O.columbianum)感染性幼虫(L_3)发育至第四期幼虫(L_4)的影响;对培养前后虫体的形态学(着重在头部、口、排泄系统、肠和尾部)变化进行了详细的观察和描述。

In order to study the application of Photo Synthetic Bacteria(and known as PSB)inaquaculture,we have carried a series of res earches on the isolation and cultivation of PSBas well as on their influence on fish growth since the fall of 1986.What have been reported in this article in the value of using PSB as the inilial feed for fish larvae.Itheresearches results indicate,that if Photo Synthetic Bacteria is used alone,the survial rateof the fish larvae will be enhanced greatly.But.because the nutrition ingredient...

In order to study the application of Photo Synthetic Bacteria(and known as PSB)inaquaculture,we have carried a series of res earches on the isolation and cultivation of PSBas well as on their influence on fish growth since the fall of 1986.What have been reported in this article in the value of using PSB as the inilial feed for fish larvae.Itheresearches results indicate,that if Photo Synthetic Bacteria is used alone,the survial rateof the fish larvae will be enhanced greatly.But.because the nutrition ingredient is notgood enough,the growth speed of the fish larvae will be slow.If PSB and other foudderaare mixed in using,the survial rate and the growth speed of the fish larvae will beincreased greatly.

本文所报导的是用光合细菌作为仔鱼开口饵料的效果。实验结果表明,单纯使用光合细菌,鱼(?)成活率较高,但因营养成份不全面,仔鱼生长速度较慢;如将光合细菌和其它饵料混合使用,则仔鱼在体长、体重和成活率方面均有显著提高。

The nutrition ingredient determination of N, P, K, Ca, Mg, Fe, Mn, Cu, Zn in the navel orange trees of different ages shows as fallows: the content of Ca in flower, young fruit and leaf blade for the old tree is larger or much larger than that for the young one; on the contrary, the content of N and K in them for the young tree is larger or much larger than that for the old one; the diversity of the othern utrition ingredients is not obvious. For the first bearing fruit tree, high rate of generation...

The nutrition ingredient determination of N, P, K, Ca, Mg, Fe, Mn, Cu, Zn in the navel orange trees of different ages shows as fallows: the content of Ca in flower, young fruit and leaf blade for the old tree is larger or much larger than that for the young one; on the contrary, the content of N and K in them for the young tree is larger or much larger than that for the old one; the diversity of the othern utrition ingredients is not obvious. For the first bearing fruit tree, high rate of generation of xanthochroism of secondary fruit of the navel orange is closely concerned with nutrition disorder of Ca in the tree.

通过对不同树龄脐橙树体N、P、K、Ca、Mg、Fe、Mn、Cu、Zn等养分的测定表明:花、幼果及叶片中Ca含量是树龄长的树高于或显著高于树龄短的树;N、K含量则相反,是树龄短的树高于或显著高于树龄长的树;其它养分差异不显著。幼树初投产脐橙次生果黄化的高发生率与树体钙营养失调密切相关。

 
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