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71.
Many observations are reported that organic mercury compounds are involved in increasing intracellular Ca2+ levels. However, the issue of which substances on the cell membrane participate in the Ca2+ uptake that is induced by ethyl mercury is unclear. The findings of this study suggest that the P2X receptor participates in this process. The uptake of Ca2+ by C8-B4 cells was induced in the presence of ethyl mercury. Ca channels in the cell membrane were not affected in this process. In contrast, pretreatment with suramin, an antagonist of the P2X receptor, inhibited the Ca2+ uptake induced by ethyl mercury, and also brilliant blue G, a nonselective antagonist of P2×4, P2×5, and P2×7 receptors. In addition, A438079 and A740003, selective antagonists of P2×7 receptor, reduced Ca2+ uptake, while 5-BDBD, a selective antagonist of P2×4 receptor, did not. Furthermore, the mRNAs of both the P2×4 and P2×7 receptors were expressed in the presence of ethyl mercury, but the P2×5 receptor mRNA was not. These findings suggest that ethyl mercury may induce Ca2+ uptake through the P2×7 receptor of the cell membrane. 相似文献
72.
Tomonari Akamatsu Kiyomi Nakamura Ryo Kawabe Seishiro Furukawa Hiromi Murata Akihiro Kawakubo Masayuki Komaba 《Marine Biology》2010,157(8):1879-1887
A number of local populations of finless porpoises (Neophocaena phocaenoides) are widely distributed throughout the warm coastal waters of Asia. The Omura Bay population, consisting of approximately
300 individuals, is the smallest of five populations inhabiting Japanese waters. It is a relatively new population that established
after the global warming that took place approximately 9000 years ago. To observe whether these porpoises appear in the major
corridor to the ocean from Omura Bay, we used acoustic monitoring to record occurrences of finless porpoises from November
2007 to May 2009. A stereo acoustic event recorder recorded the intensity and the sound source direction of biosonar signals,
providing independent traces of sound sources corresponding to each detected animal. A total of 226 individuals were detected
over the 1.5-year monitoring period, of which 76% occurred at night and 73% occurred during March and April. We compared the
presence of porpoises to the Japanese anchovy catch in Omura Bay and the Hario Strait over the same period. Results suggested
that possible reductions in anchovy resources in the bay could attract porpoises to the outside of their normal habitat. In
total, 70% of the porpoise recordings took place when the tidal current was moving out of Omura Bay. Porpoises might follow
the prey that are transported out of the bay due to the strong outbound current. The finless porpoises confined to the bay
might extend their swimming area if prey is available. 相似文献
73.
Kenji Karino Takatsugu Ishiwatari Hiromi Kudo Aya Sato 《Behavioral ecology and sociobiology》2011,65(6):1305-1315
Female mate preference for dorsal fin length in male guppies (Poecilia reticulata) was investigated. In a dichotomous choice experiment using live males, females preferred males with longer dorsal fins to
those with shorter dorsal fins. When the dorsal fin lengths of the two males were reversed by surgical manipulation, the females
reversed their preference. To further examine this preference behaviour, a second dichotomous choice experiment was conducted
using digitally modified male images that differed only in dorsal fin lengths. In this next experiment, females preferred
male images with a longer dorsal fin than those with a shorter dorsal fin. In order to clarify the cost of possessing a long
dorsal fin for males, the effect of dorsal fin length on swimming performance of males was also examined with a flow chamber.
Male swimming performance was enhanced by surgically shortening the dorsal fin. The result of this study suggests that the
long dorsal fin of male guppies is a costly handicap that may have evolved due to female mate choice. 相似文献
74.
Kondo Monami Sakamoto Yasuhide Kawabe Yoshishige Nakamura Kengo Watanabe Noriaki Komai Takeshi 《Environmental Modeling and Assessment》2022,27(2):251-273
Environmental Modeling & Assessment - This work developed a model for predicting the volatilization flux from the unsaturated soil contaminated by volatile chemical substances (VCSs) such as... 相似文献