• Animal cells and systems
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• 제4권3호
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• pp.239-243
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• 2000

Most space-related life science programs are expensive and time-consuming, requiring international cooperation and resources with trans-disciplinary expertise. A comprehensive future program in "life sciences in space" needs, therefore, well-defined research goals and strategies as well as a sound ground-based program. The first half of this review will describe four key aspects such as the environment in space, previous accomplishments in space (primarily focusing on amphibian embryogenesis), available resources, and recent advances in bioinformatics and biotechnology, whose clear understanding is imperative for defining future directions. The second half of this review will focus on a broad range of interdisciplinary research opportunities currently supported by the National Aeronautics and Space Administration (NASA), National Institute of Health (NIH), and National Science Foundation (NSF). By listing numerous research topics such as alterations in a diffusion-limited metabolic process, bone loss and skeletal) muscle weakness of astronauts, behavioral and cognitive ability in space, life in extreme environment, etc., we will attempt to suggest future opportunities.

• 한국동물학회지
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• 제31권1호
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• pp.29-34
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• 1988

초기 발생과정에 있어서 핵과 세포질이 상호작용을 조사하기 위하여 양서류 한 종의 핵을 이조의 무핵 수정란에 치환하였다. Rana속에 속하는 R.dybowskii,R.nigromaculata,R.pipiens등의 이종간 잡종의 개체의 경우 낭배초기를 전후하여 발생이 중지되며,Rana,Xenopus그리고 Axolotl의 속간 핵치환에서는 후기포배기에 발생이 중지되는 양상을 보인다. 이때 각 핵-세포질 조합의 발생수행능력을 비교하면 계통발생상의 유연관계가 먼 종일수록 초기에 발생이 중지되는 결과를 나타냈다. 일반적으로양서류 종간 핵치환 결과는 후기 포배까지는 정상발생양상을 보이고 있다. 이와같은 잡종개체가 초기에 발생수행능력의 제한을 받는 요인은 두가지로 생각할 수 있는데, 치환된 핵에 비가역적 변화가 일어났을 가능성과 핵과 세포질간의 기능적 비양립성이 그것으로 현재로서는 후작 좀 더 가능성 있는 요인으로 사료된다.

• 한국동물학회지
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• 제30권3호
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• pp.248-260
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• 1987

In order to investigate the importance of the prospective mesodermal and endodermal blastomeres at 32-cell stage in the anis formation, blastomeres were deleted or transplanted into the ventrovegital site of another normal embryo. The results are as follows: When the dorsomesodermal or dorsoendodermal blastomeres were deleted, there was a substantial developmental lesion in the axis structure. However, when the ventromesodermal or ventroendodermal blastomeres were deleted, the formation of an axis structure was nearly normal. The dorsomesodermal or dorsoendodermal blastomeres which were transplanted into the ventral side of the normal 32-cell embryo caused the formation of a secondary body axis, and the capacity of the second axis induction in the dorsomesodermal blastomeres was a little higher than that in the dorsoendodermal blastomeres. These results imply that both the dorsomesodermal and dorsoendodermal blastomeres are involved in the formation of a set of dorsal body structures during early embryogenesis. As well, in order to investigate the axis inducing capacity in the early cleavage embryos, the dorsovegital blastomeres were transplanted into the ventrovegital site at 4-cell, 8-cell and 16-ceIL stage respectively. As a ruts·fIt, a second body axis was formed. Therefore, it seems that the early cleavage embryo as 4-cell stage dorsal blastomeres contain some informations necessary for the axis formation.