J-GLOBAL ID:200904095760348066  Research Project code:0250002553 Update date:Jan. 19, 2004

Biological motion and reproduction

Study period:2000 - 2001
Research overview:
1. The study has investigated the movement of mammal sperms and the regulation mechanism of the metabolic activity by using mice. Ca2 maintained the long-term activity of the sperm movement. This indicates that the control of mitochondria activity by Ca2 is essential in maintaining the movement rather than the activity control by protein phosphorylation triggered by ion bicarbonate. 2. The study also investigates the impact of over-gravity on the reproduction functions of male mice by using a centrifugal rearing cage. A long-term rearing of the mice under the over-gravity environment was conducted this year. The results showed that the growth rate of such mice is slower for a while than the control group grown on the ground and, however, the difference in the growth rate is going to be smaller in the long run. 3. The gravitational tactic of Dicyemida larva is closely related to the movement of the cilia concentrating on the sides of the body. The ciliary movement of the larva fixed under the microscope was taped in different positions by using the high-speed video camera. The results showed that the frequency of the ciliary movement varies depending on the part of the body and that such frequency also changes when the positions of the body are changed. 4. The osmotic pressure adaptability of the sperms of Orechromis.spp, a euryhaline fish, was investigated. The results showed that the movement of the sperms of the Orechromis.spp that adapted to fresh water can be activated by adding the in-cell Ca2 change so that it can give an osmotic pressure stimulus at the time of releasing sperms. The movement of the sperms of the Oreochromis.spp that adapted to seawater can be activated by taking the Ca2 in the sea water.
Research program: Ordinary Research
Ministry with control over the research :
Ministry of Education, Culture, Sports, Science and Technology

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