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31.
Tsutomu HASHIZUME Tatsuru SAWADA Yuka NAKAJIMA Tomoyoshi YAEGASHI Hayato SAITO Yuki GOTO Jin JIN Ferenc FÜLÖP György Miklos NAGY 《Animal Science Journal》2012,83(1):63-67
The secretion of prolactin (PRL) is under the dominant and tonic inhibitory control of dopamine (DA); however, we have recently found that salsolinol (SAL), an endogenous DA‐derived compound, strongly stimulated the release of PRL in ruminants. The aim of the present study was to clarify the inhibitory effect of DA on the SAL‐induced release of PRL in ruminants. The experiments were performed from late June to early July. Male goats were given a single intravenous (i.v.) injection of SAL (5 mg/kg body weight (BW)), a DA receptor antagonist (sulpiride, 0.1 mg/kg BW), or thyrotropin‐releasing hormone (TRH, 1 µg/kg BW) before and after treatment with a DA receptor agonist (bromocriptine), and the effect of DA on SAL‐induced PRL release was compared to that on sulpiride‐ or TRH‐induced release. Bromocriptine completely inhibited the SAL‐induced release of PRL (P < 0.05), and the area under the response curve (AUC) for a 120‐min period after the treatment with bromocriptine was 1/28 of that for before the treatment (P < 0.05). Bromocriptine also completely inhibited the sulpiride‐induced release (P < 0.05). The AUC post‐treatment was 1/17 that of pre‐treatment with bromocriptine (P < 0.05). Bromocriptine also inhibited the TRH‐induced release (P < 0.05), though not completely. The AUC post‐treatment was 1/3.8 that of pre‐treatment (P < 0.05). These results indicate that DA inhibits the SAL‐induced release of PRL in male goats, and suggest that SAL and DA are involved in regulating the secretion of PRL. They also suggest that in terms of the regulatory process for the secretion of PRL, SAL resembles sulpiride but differs from TRH. 相似文献
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Electrotonic transmission between spinal neurons is correlated with distinctive apposition of cell processes involving membrane fusion. In the same neurons, postsynaptic potentials appear to arise at typical synaptic knobs where there is an intercellular space. 相似文献
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Yukiko Maruji Momoko Shimizu Michiyo Murata Masashi Ando Morihiko Sakaguchi Takashi Hirata 《Fisheries Science》2010,76(3):521-528
Boiled muscle extracts obtained from yellowtail Seriola quinqueradiata and bastard halibut Paralichthys olivaceus were treated with two kinds of purified enzymes (acid phosphatase and glutamate decarboxylase), and the change in contents
of nucleotides, related compounds, and free amino acids was examined. The change in taste qualities was also investigated
by a taste test. The enzyme treatment resulted in a marked decrease in the contents of such umami substances as inosine 5′-monophosphate
(IMP) and glutamic acid (Glu). The taste test revealed that the treatment of these fish muscle extracts with both or either
of the enzymes caused a sharp decrease in umami intensity and also an increase in sourness but not a change in pH. The treatment
also effected marked decreases in thickness and overall taste intensity. These findings suggest that IMP and Glu function
not only to intensify the thickness and overall taste as well as the umami, but also to repress the sourness sensation elicited
by the fish muscle extracts. 相似文献
34.
Climate change and interspecific interactions drive species alternations between anchovy and sardine in the western North Pacific: Detection of causality by convergent cross mapping 
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下载免费PDF全文 Shin‐Ichiro Nakayama Akinori Takasuka Momoko Ichinokawa Hiroshi Okamura 《Fisheries Oceanography》2018,27(4):312-322
The abundance and recruitment of anchovy Engraulis spp. and sardine Sardinops spp. alternate in a synchronized way across the Pacific. Convergent cross mapping (CCM) indicated that climate change drives the alternation of the two species in the California Current System. However, climate indices patterns in the western North Pacific contrast with those in the eastern North Pacific, despite synchronous species alternations occurring. Therefore, it is of great interest to clarify whether climate change, or any other factors, affects the population dynamics of Japanese anchovy and Japanese sardine in the western North Pacific. Using CCM, we tested whether climate change and interspecific interactions affect the population dynamics of these two species. We found that climate change affected recruitment, and we clarified the spatiotemporal pattern of this effect. This result supports the existing hypotheses that population dynamics are regulated by climate change in the western North Pacific. The present study also detected interspecific interactions between sardine and anchovy, which might promote the alternation of the two species, and has not been reported in other regions. 相似文献
35.
Norikuni Ohtake Shinya Yamada Momoko Suzuki Nobuo Takahashi Yoshihiko Takahashi Toshikazu Chinushi 《Soil Science and Plant Nutrition》2013,59(1):247-253
Extract The storage protein of soybean [Glycine max (L.)] seed mainly consists of glycinin, composed of acidic (38 and 45 kDa) and basic (22 kDa) subunits (Kitamura et al. 1976), and β-conglycinin composed of α′- (75 kDa), α- (72 kDa), and β-(52 kDa) subunits (Thanh and Shibasaki 1978). 相似文献
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Yuki NAKAJIMA Tetsuya HATTORI Atsushi ASANO Naoto ISHIKAWA Atsushi TAJIMA 《The Journal of reproduction and development》2014,60(6):406-410
A series of experiments was conducted to investigate migration, proliferation and differentiation of gonadal germ cells (GGCs) collected from the gonads of 7-day-old chick embryos under cross-sex germline chimera conditions. The migratory and proliferative abilities of exogenous GGCs were examined by transferring 50 fluorescently labeled GGCs collected from White Leghorn (WL) embryos into the blood of 2-day-old Rhode Island Red (RIR) embryos. No significant difference was
observed in the number of fluorescently labeled GGCs in the gonads of recipient embryos among any of the four possible donor and recipient sex combinations. Cross-sex germline chimeras were produced to examine the differentiation of GGCs by transferring 100 GGCs from WL embryos into 2-day-old RIR embryos. Exogenous-GGC-derived progeny were obtained from both male and female recipients, except when female GGCs were transferred into male recipients. The migratory ability of GGCs
recovered from the 7-day-old embryonic gonad was not influenced by cross-sex germ cell transfer conditions, whereas the differentiation of the GGCs was affected by the sex combinations of GGCs donors and recipients. 相似文献
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Hideaki HAYASHI Sachiko MARUYAMA Madoka FUKUOKA Takaharu KOZAKAI Keiichi NAKAJIMA Takenori ONAGA Seiyu KATO 《Animal Science Journal》2013,84(1):35-41
Fatty acid‐binding protein (FABP) has high affinity for long‐chain fatty acids and appears to participate in the metabolism and intracellular transport of lipids. Liver‐ and intestinal‐type FABP (L‐FABP and I‐FABP, respectively) are expressed in the small intestine. However, in the gastrointestinal tract of ruminants, expression and localization of FABPs are unknown. In this study, we investigated the expression of I‐FABP and L‐FABP in the gastrointestinal tract of cattle. I‐ and L‐FABP had higher messenger RNA (mRNA) and protein expression levels in the duodenum and jejunum relatively to other gastrointestinal regions in both calves and cows. Furthermore, L‐FABP mRNA and protein expression were high in the colon. Both these protein types were confirmed to be in the cytosol of jejunal epithelial cells, where they were found in the villi rather than in the crypts. We concluded that duodenal and jejunal FABPs might be involved in the metabolism of fatty acids mainly in epithelial cells in cattle. 相似文献
40.
Asano K Suzuki K Chiba M Sera K Asano R Sakai T 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2006,68(7):769-771
To investigate the relationships between trace elements concentrations in hair and atrial fibrillation (AF) in horses, concentrations of nineteen trace elements were detected in hair using the particle induced X-ray emission (PIXE) method. The horses were assigned to either control (n=22, no abnormalities) or AF groups (n=5) based on electrocardiograph findings. The mean concentrations of Ca and Zn in the hair of the AF group were significantly higher than those in the control group. The Zn/Cu ratio of the hair in the AF group (29.8 +/- 5.5) was significantly higher than that in the control group (23.4 +/- 2.2, P<0.05). The results of the present study suggest that there is a relationship between elevated concentrations of Ca and Zn in hair and AF. 相似文献