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排序方式: 共有640条查询结果,搜索用时 32 毫秒
1.
Chiaki Ikeda Yuki Manabe Nami Tomonaga Tatsuya Wada Takashi Maoka Tatsuya Sugawara 《Marine drugs》2020,18(12)
Halocynthiaxanthin is an acetylenic carotenoid mainly found in Halocynthia roretzi. To date, several bioactivities of halocynthiaxanthin have been reported, but its mechanism of digestion and absorption in mammals has not been studied yet. In this study, we evaluated the intestinal absorption of halocynthiaxanthin in mice. The halocynthiaxanthin-rich fraction was prepared from the tunicate Halocynthia roretzi. Mice were orally administered the fraction at a dose of 5 mg/kg body weight. The halocynthiaxanthin levels in the plasma, liver, and small intestine, were quantified using HPLC-PDA, 1, 3, 6, and 9 h after ingestion. The halocynthiaxanthin-rich fraction mainly consisted of the all-trans form and a small amount of cis forms. These three isomers were detected in the plasma of mice 3 h after ingestion. Time-course changes after the ingestion of this fraction were found, with cis isomers being more abundant than the all-trans isomer in the mouse plasma and liver. In the small intestine, however, the all-trans isomer was primarily detected. The possibility that cis isomers might be absorbed rapidly from the small intestine cannot be denied, but our results suggest that dietary all-trans-halocynthiaxanthin might be isomerized to the cis isomer after intestinal absorption. 相似文献
2.
Yojiro YANAGAWA Yukiko MATSUURA Masatsugu SUZUKI Shin-ichi SAGA Hideto OKUYAMA Daisuke FUKUI Gen BANDO Masashi NAGANO Seiji KATAGIRI Yoshiyuki TAKAHASHI Toshio TSUBOTA 《The Journal of reproduction and development》2015,61(1):61-66
Generally, sika deer conceive a single fetus, but approximately 80% of pregnant females have two corpora lutea (CLs). The function of the accessory CL (ACL) is unknown; moreover, the process of ACL formation is unclear, and understanding this is necessary to know its role. To elucidate the process of ACL formation, the ovarian dynamics of six adult Hokkaido sika deer females were examined ultrasonographically together with peripheral estradiol-17β and progesterone concentrations. ACLs formed in three females that conceived at the first estrus of the breeding season, but not in those females that conceived at the second estrus. After copulation, postconception ovulation of the dominant follicle of the first wave is induced by an increase in estradiol-17β, which leads to formation of an ACL. A relatively low concentration of progesterone after the first estrus of the breeding season is considered to be responsible for the increase in estradiol-17β after copulation. 相似文献
3.
Yasushi Ohmachi Tomomi Imamura Mizuyo Ikeda Eriko Shishikura Eunjoo Kim Osamu Kurihara Kazuo Sakai 《Journal of toxicologic pathology》2015,28(2):65-71
To evaluate the effectiveness of sodium bicarbonate (SB) in removing uranium and protecting animals from uranium toxicity, we intramuscularly administered 1 mg/kg of uranyl nitrate to 8-wk-old male SD rats, and 20 min after administration of uranyl nitrate, the animals were given a single oral administration of SB at 0.1, 0.3 or 1 g/kg. The SB treatment at a dose of 0.3 g/kg or more raised the pH of the rats’ urine until 4 h after treatment, and it significantly reduced the uranium amounts in the kidneys at 1 day after treatment. In another experiment, rats were intramuscularly administered 1 mg/kg of uranyl nitrate, and 20 min later, the animals were treated with sodium bicarbonate (0.1 or 1 g/kg). The rats were autopsied at 1, 3 and 7 days after uranium treatment. High-dose SB resulted in a significant increase in urinary uranium excretion in the first 24 h and a reduction of uranium deposition in the kidneys and femurs, and it also significantly suppressed uranium-induced renal toxicity, as shown by both histopathology and clinical chemistry at 3 days after uranium treatment. Low-dose SB did not show such marked effects. Our findings demonstrated that the uranium decorporation effect of sodium bicarbonate was observed at the dosage showing urine alkalinization in rats and that decorporation effect of sodium bicarbonate might be beneficial if it is administered immediately after incorporation of soluble uranium. 相似文献
4.
Ayano OMURA Wataru ANZAI Daisuke KOYABU Hideki ENDO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(9):1043-1048
Clarification of the trunk structure in Urodela is important in understanding the
locomotive evolution of basal tetrapods. The components of the muscular trunk wall among
Urodela using different modes of locomotion were compared. Since the whole trunk may be
used for swimming and the effect of limbs may be small in the more aquatic species, they
showed smaller differences in the trunk muscles among anterior, middle and posterior
sections of the trunk. By contrast, in the more terrestrial species, the dorsal and
abdominal muscles are larger in the middle section than those in the anterior and
posterior sections. High compressive stresses occur in the supporting limbs and their
insertion at the trunk on the ventral side, and spread from the forelimbs along the back
to the supporting hindlimbs on the dorsal side. Tensile stresses occur in the middle
ventral part. The components of the trunk muscles among the three sections may reflect
differences in stresses occurring in the trunk of the more terrestrial species. The
findings also suggest that in the middle section, larger dorsal muscles for stiffening the
back to maintain posture and larger abdominal muscles are responsible for balancing the
body weight while it is supported by the limbs in the more terrestrial species. 相似文献
5.
Kent MORI Satoshi SUZUKI Daisuke KOYABU Junpei KIMURA Sung-Yong HAN Hideki ENDO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(5):571-578
Although the sea otter (Enhydra lutris) is a complete aquatic species,
spending its entire life in the ocean, it has been considered morphologically to be a
semi-aquatic animal. This study aimed to clarify the unique hindlimb morphology and
functional adaptations of E. lutris in comparison to other Mustelidae
species. We compared muscle mass and bone measurements of five Mustelidae species: the sea
otter, Eurasian river otter (Lutra lutra), American mink
(Neovison vison), Japanese weasel (Mustela itatsi) and
Siberian weasel (M. sibirica). In comparison with the other 4 species,
E. lutris possessed significantly larger gluteus, popliteus and
peroneus muscles, but smaller adductor and ischiopubic muscles. The popliteus muscle may
act as a medial rotator of the crus, and the peroneus muscle may act as an abductor of the
fifth toe and/or the pronator of the foot. The bundles of the gluteus superficialis muscle
of E. lutris were fused with those of the tensor fasciae latae muscle and
gluteofemoralis muscles, and they may play a role in femur abduction. These results
suggest that E. lutris uses the abducted femur, medially rotated crus,
eversion of the ankle and abducted fifth digit or extended interdigital web as a powerful
propulsion generator. Therefore, we conclude that E. lutris is a complete
aquatic animal, possessing differences in the proportions of the hindlimb muscles compared
with those in other semi-aquatic and terrestrial mustelids. 相似文献
6.
Tanaka Tatsuya Ikeda Ryunosuke Yuta Yuta Tsurukawa Kanji Nakamura Satoshi Yamaguchi Takeharu Komeyama Kazuyoshi 《Fisheries Science》2019,85(6):1037-1043
Fisheries Science - In aquaculture, periodic measurement of fish body size is required to suitably assess growth progress. The aim of this study is to monitor the growth of free-swimming red sea... 相似文献
7.
Hitoshi Kaneko Takeshi Okunishi Takashi Seto Hiroshi Kuroda Sachihiko Itoh Shinya Kouketsu Daisuke Hasegawa 《Fisheries Oceanography》2019,28(2):212-227
To clarify the effects of temperature on the recruitment of chub mackerel (Scomber japonicus) in the North Pacific, we investigated the influence of winter surface temperature (WST) on spawners at the time of maturity around the spawning grounds and the influence of ambient spring temperature on larvae using estimated temperature (ET) obtained from particle tracking experiments. We found a significant positive correlation between ET approximately 10 days following hatching and the recruitment per spawning stock biomass (RPS) after 2000. The closer (more meandering) the Kuroshio Current (KC) axis was in relation to the spawning ground, the higher (lower) the spring surface temperature and the higher (lower) RPS was in the spawning ground. In contrast, WST inside KC near the maturity/spawning ground was significantly negatively correlated with RPS. A significant negative correlation between the temperatures in winter and spring was detected in the area after 2000, when the conditions of the Pacific decadal oscillation index and the stability of the Kuroshio Extension were synchronous, indicating that KC shifted northward during this time. The reversed temperature pattern was consistent with the winter–spring movement of KC axis in the offshore direction and was correlated with the winter–spring difference in the intensity of the Aleutian low. These results suggest that the annual variation in chub mackerel recruitment after 2000 was strongly affected by the combined effects of ambient temperature because of the reversal of conditions that occurred between winter and spring around the maturity/spawning ground, which was related to the KC path. 相似文献
8.
Md Asaduzzaman Shumpei Iehata Md Moudud Islam Md Abdul Kader Abol‐Munafi Ambok Bolong Daisuke Ikeda Shigeharu Kinoshita 《Aquaculture Nutrition》2019,25(6):1300-1317
This study investigated the effects of sodium alginate supplementation on gut microbiota composition, health parameters, growth performances and growth‐related gene expression of Malaysian mahseer. Five test diets were formulated by supplementing 0%, 0.1%, 0.2%, 0.4% and 0.8% sodium alginate. Triplicate groups of juvenile Tor tambroides (2.19 ± 0.05 g) were stocked in 15 aquaria (20 individuals per aquarium) and fed at 3.0% body weight per day for 60 days. PCoA and UPGMA analysis showed that gut bacterial community were more convergence in higher sodium alginate‐supplemented diets. The percentage of Porphyromonadaceae, Bacteroides, Plesiomonas and Shewanella were substantially higher and Aeromonas, Entomoplasmatales and Prevotellaceae were drastically lower in higher sodium alginate (0.2%–0.8%) diets. Sodium alginate supplementation (≥0.2%) significantly improved the haematocrit value and respiratory burst activity of T. tambroides. Growth performances and feed utilization were significantly higher in 0.2%–0.4% sodium alginate‐supplemented diets. The increased growth rate of T. tambroides was governed by both hyperplastic and hypertrophic muscle growth. Real‐time PCR data demonstrated that most of the growth‐related genes were significantly upregulated in 0.2%–0.4% sodium alginate‐supplemented diet. Finally, it can be concluded that sodium alginate should be supplemented at 2 g/kg in practical fish feed formulation. 相似文献
9.
Takao Kishimoto Tsutomu Ikeda Olov Karlsson Kengo Magara Shuji Hosoya 《Journal of Wood Science》2002,48(1):32-37
Methyl-d-xylopyranoside was allowed to react with-O-4-type quinone methide without a catalyst to elucidate the reactivities of secondary hydroxyl groups at the C2, C3, and C4 positions. Benzyl ether-type lignin-carbohydrate complex (LCC) compounds linked at the C2 and C4 positions were predominant, at a ratio of 23. However, the reactivity of the hydroxyl group at the C3 position was quite low. These results strongly suggest that the reactivity of the C2 hydroxyl group in xylan toward quinone methide intermediate is higher than that of the C3 hydroxyl group during biosynthesis of LCCs. 相似文献
10.