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Effects of thyroxine and thiourea on the metamorphosis of coral trout grouper Plectropomus leopardus
DODY DHARMAWAN TRIJUNO KENZO YOSEDA JUN HIROKAWA MASATOMO TAGAWA MASARU TANAKA 《Fisheries Science》2002,68(2):282-289
The contribution of the thyroid hormone to the metamorphosis of the coral trout Plectropomus leopardus was examined. Juveniles, aged 35 days, were exposed to thyroxine (T4, 0.1 p.p.m) and thiourea (TU; inhibitor of thyroid hormone synthesis, 30 p.p.m) for 13 days. All the fish in the T4-treated group had completed metamorphosis (second metamorphosis, pigmentation and resorption of fin spines) within three days after the beginning of the experiment (day 3), whereas it took 13 days for this to occur in the control fish. Moreover, the fish in the TU group had not completed metamorphosis even by day 13. Settling behavior was significantly stimulated by T4 treatment, as was the resorption of the dorsal and pelvic fin spines, the reduction of serration on the spines, and the transition of body color into an opaque reddish hue. Fish in the TU group had longer dorsal and pelvic spines, retarded pigmentation and an abnormal black coloration. These results suggest that thyroid hormone accelerates most changes during the second metamorphosis in the coral trout. 相似文献
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Blood samples from 78 cattle were tested for hemoplasma infection using molecular methods. PCR and sequence analysis revealed that 17 cattle were infected with Mycoplasma wenyonii, while 13 were infected with 'Candidatus Mycoplasma haemobos'. Four animals were infected with both species. This is the first study to report hemoplasma species infection among cattle in Japan. 相似文献
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This study aimed to develop a water-extraction system which could produce the fresh water from the air in arid regions and which used renewable energies as the electric power source. In this paper, the experiments for water extraction from the air were carried out by using the novel multi-stage water-extraction device with Peltier deices for two cases of temperature and related humidity of the air. One was the case where the temperature and the related humidity of the air were constant, and the other was the case where they were simulated the variation of the temperature and related humidity of the air in a day of summer and spring in Loess Plateau, China. The effects of the temperature and related humidity of the atmospheric air and supply the electric power to Peltier devices on performance of water production of the device were investigated and reported. 相似文献
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Tagawa M Takeuchi T Fujisawa T Konno Y Yamamoto S Matsumoto K Yokoyama N Inokuma H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2012,74(1):99-102
A 2-year-old East Friesian sheep imported from Australia exhibited severe anemia after contagious pustular dermatitis in Hokkaido, Japan. Hemoplasma infection was confirmed in blood smears. Both Mycoplasma ovis and 'Candidatus Mycoplasma haemovis' were detected by PCR and sequence analyses. In the epidemiological analysis, dual pathogens were detected in 6 of 12 (50.0%) sheep imported from Australia with the infected ewe at the same time, 1 of 5 (20.0%) sheep introduced from a domestic farm in Hokkaido, and in 1 of 16 (6.3%) sheep from an epidemiologically unrelated ranch. It is the first clinical case of sheep to confirm coinfection of these pathogens in Japan. 相似文献
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为提高直线翼垂直轴风力机自起动性能,设计可安装在风轮上下两端圆台型聚风罩,收集更大面积来流提高来流风速。针对聚风罩高度、倾角及距风轮距离等主要结构参数作二次正交旋转组合设计,利用三维数值模拟方法计算不同聚风罩结构参数条件下风力机起动力矩,对比分析优化聚风罩结构参数,可有效提升风力机起动力矩。通过分析聚风罩与风轮间流场变化,揭示聚风罩对风力机起动力矩影响机理。 相似文献