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Distribution of the Germinal Vesicle Material during Progesterone-Induced Oocyte Maturation in Xenopus and in Cynops 总被引:1,自引:0,他引:1
The distribution of the germinal vesicle material in the oocyte during progesterone-induced maturation was studied in Xenopus and in Cynops. In both species, two distinctive masses of yolkfree cytoplasm appear in specific areas of the oocyte and at definite stages of maturation. One, the primary cytoplasmic mass, is formed at the basal side of the germinal vesicle during early maturation and is very RNA-rich. In Xenopus , a large part of the primary cytoplasmic mass persists as a mass during maturation and ends up as a thin disk at the boundary between the animal and the vegetal hemisphere in the mature oocyte. In Cynops , a rod-like primary cytoplasmic mass extends near to the equatorial zone and becomes indistinct in the mature oocyte. The other, the secondary cytoplasmic mass, is formed at or prior to germinal vesicle breakdown in areas around the germinal vesicle and is also RNA-rich. The secondary cytoplasmic mass is dispersed and constitutes the RNA-rich animal hemisphere cytoplasm in the mature oocyte. Observed results suggest that the primary and the secondary cytoplasmic mass contain different germinal vesicle materials. 相似文献
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SHIN-ICHIRO YASUDA TAKAHIRO MIYAZAKI KOUJI MUNECHIKA MASAMI YAMASHITA YOSHITAKA IKEDA AKIHITO KAMIZONO 《Journal of receptor and signal transduction research》2013,33(4):235-246
We attempted to determine natural agonists of GPR39 in fetal bovine serum (FBS). FBS was conditioned to extract peptides and fractionated by two types of HPLC. The activity of each fraction was monitored by intracellular calcium mobilization. Then the purified active ingredient was analyzed by inductively coupled plasma mass spectrometry. In this fashion, Zn2 + ion was identified as an agonist of GPR39, though no peptidergic molecules were found. The calcium-mobilizing activity of Zn2 + was not abolished by pertussis toxin but was by a phospholipase C (PLC) inhibitor, U73122, indicating that the activity of GPR39 is mediated through the Gqα -PLC pathway. In addition, Zn2 + also activated mouse and rat GPR39, showing that the function of GPR39 as a Zn2 + receptor is conserved across species. This study is the first exploration of GPR39 agonists in FBS and indicates that GPR39 functions as a Gq-coupled Zn2 +-sensing receptor. 相似文献
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Fertilization Potential and Calcium Transients in Mammalian Eggs 总被引:1,自引:0,他引:1
SHUN-ICHI MIYAZAKI 《Development, growth & differentiation》1988,30(6):603-610
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Infraciliature and morphogenesis of six rumen ciliates, Ostracodinium mammosum, O. munham, O. dilobum, O. rugoloricatum, O. iwawoi, and O. tiete are described from pyridinated silver carbonate-impregnated specimens. These six Ostracodinium have a similar polybrachykinety arrangement, distinct from that of other ophryoscolecid ciliates and intermediate between those of O. gracile and 0. damaliscus. Buccal infraciliature is composed of three polybrachykineties, a kinety loop, and paralabial kineties. Small dorso-adoral polybrachykinety, slender vestibular polybrachykinety, and kinety loop are characteristic. Dorsal infraciliature consists of the dorsal polybrachykinety that extends laterally along the dorsal side of the body. Morphogenesis is different from that of O. gracile, because the right end of ventral primordium extends dorsally to grow into a right primordium without separation. 相似文献
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KAORU OGURI 《American anthropologist》2006,108(1):234-235
Asian American Religions: The Making and Remaking of Borders and Boundaries . Tony Carnes and Fenggang Yang, eds. New York: New York University Press, 2004. 399 pp. 相似文献
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Effects of Cytochrome c on Liver Functions of Old Rats 总被引:1,自引:0,他引:1
HARUO OHNISHI SHIGERU TSUKUDA YUTAKA HAYASHI NOBUHISA OGAWA GOMPACHI YAJIMA YOZO MASUGI KAORU AIHARA KATSUYA SUZUKI 《Nature: New biology》1972,239(90):84-86
WE have shown1,2 that cytochrome c, when orally administered, is absorbed intestinally. The effects of parenterally administered cytochrome c on the liver have been studied by Drabkin3 and Murano4. We have also studied the effects of orally administered cytochrome c on experimental liver injury5. 相似文献