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排序方式: 共有265条查询结果,搜索用时 15 毫秒
21.
Takahiro AYA Yukiko TOMIOKA Takashi TAKEUCHI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(7):1144
The effect of lactoferrin (LF) on embryo development was investigated by using lipopolysaccharide (LPS)-treated mouse sperm. For the development rate of the 2-cell stage embryo, the embryo derived from LPS- and LF-treated sperm showed similar survival rate to the control embryo. On day 12 after the embryo transfer into the recipient, the frequent abnormality was observed in the embryo derived from LPS-treated sperm, and the abnormality was tended to be inhibited in the embryo derived from LPS- and LF-treated sperm. These results imply that LF treatment on sperm contaminated with bacteria may facilitate the embryo development, which contribute to the improvement of infertility. 相似文献
22.
Reduction of transport stress of ayu by obligated schooling 总被引:3,自引:0,他引:3
KEI'ICHIRO IGUCHI FUMINARI ITO KOGI OGAWA NAOTO MATSUBARA TAIGA YODO TSUGIKO YAMASAKI 《Fisheries Science》2002,68(4):849-853
We investigated stress responses of ayu Plecoglossus altivelis under the hypothesis that overcrowding during transport can be a stressor and the stress predisposes fish to disease by decline in immunocompetence. The extent of stress response was determined under different fish densities. As inferred from the serum concentration of cortisol 1 day after the treatment, the density at more than 23 kg/m3 , which was within the range of normal transporting procedures, acutely evoked intense stress responses. To examine a possible way to reduce the stress response of fish under crowding conditions, we compared two fish groups established in water tanks with circulating (whirling) and turbulent currents at the same density. The cortisol levels 1 day after the treatment were 2.5-fold higher in turbulent current than in whirling current. Fish in whirling current formed a school, while those in turbulent current aggregated with each other. Schooling of fish induced by water flow may reduce their stress responses during transport. A transport system with a directional water flow should keep fish in good condition without reducing the number of fish contained. 相似文献
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Manabu OZAWA Yukiko YAMASAKI Miho HIRABAYASHI Yukio KANAI 《Animal Science Journal》2003,74(3):181-185
Mammalian preimplantation embryos are susceptible to heat stress. This present study examined how maternal heat stress affects the development of mouse zygotes in vivo and in vitro. In Experiment 1, zygotes collected from female mice that were heat‐stressed for 12 h on day 1 of pregnancy were cultured in vitro. Maternally heat‐stressed zygotes developed normally to the two‐cell stage, but the majority of embryos failed to develop into morulae or blastocysts. In Experiment 2, pregnant mice were heat‐stressed on day 1 or from day 1 to day 3 of pregnancy. The number of living fetuses on day 14 of pregnancy was lower in heat‐stressed mice than in non‐stressed mice, but the difference was significant only in successively heat‐stressed mice. These results demonstrate that maternally heat‐stressed zygotes have reduced in vitro viability, but this phenomenon does not necessarily lead to embryo loss in the maternal environment. 相似文献
27.
Mizutani Y Matsumura Y Murakami H Mori T 《Journal of agricultural and food chemistry》2004,52(11):3570-3576
The effects of heat treatment on the interaction of lipid and zein in a dry powder system were investigated. Linolenic acid ethyl ester (LAE) was mixed with the zein powder. The glass transition temperature (T(g)) for the dry powder zein was shown to be approximately 107 degrees C by differential scanning calorimetry. The thermogram of the zein-LAE mixed powder showed an exothermic transition near the T(g) of zein. Fourier transform infrared (FT-IR) spectroscopy was used for detecting the structural changes in zein by heat treatment, that is, elevating the temperature from 25 to 160 degrees C. The heat treatment of the powdery zein with and without LAE caused increases in the alpha-helix, beta-turn, and beta-sheet, concomitant with decreases in the intermolecular hydrogen-bonded beta-sheet and random coil. Such changes in the secondary structure were more drastic for the powder with LAE. The heating of the zein-LAE mixed powder also caused decreases in the peaks originating from LAE in the FT-IR spectra. These results suggest that the heat treatment induced the interaction of the zein and LAE in the powdery system. The influence of heating on the antioxidative activity of dry powder zein was studied by measurements of the peroxide value. When zein-LAE mixed powder was heated before storage, the oxidation of LAE was inhibited for 7 days, whereas LAE was oxidized within 1 day in the absence of heat treatment. 相似文献
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Yasushi Narita Kei Satoh Keiichi Hayashi Tamami Iwase Shigeru Tanaka Yukiko Dokiya Morikazu Hosoe Kazuhiko Hayashi 《Water, air, and soil pollution》2001,130(1-4):1649-1654
In recent years, acid rain has been a social problem all over the world. In Japan, it is also a big problem especially in the metropolitan area. Then, we have measured major ions such as H+, Na+, NH4 +, K+, Mg2+, Ca2+, Cl?, NO3 ?, and SO4 2? in precipitation and dry deposition samples which had been collected at 9 sampling sites at Hiyoshi, Mita, Kashiwa, Shiki, Fujisawa, Yokosuka, Mitaka, Hachiouji, and Ashikaga in Tokyo Metropolitan area for 10 years since 1990. The average pH of precipitation in their sites was 4.56 (n=1906). As the results of multiple regression analysis showed that pH of precipitation was determined by 5 ions such as NH4 +, nssCa2+(non sea salt calcium), nssCl?(non sea salt chloride), NO3 ?, nssSO4 2?(non sea salt sulfate) in the most of the sampling sites. Therefore, it is very important to investigate the behavior of these ions to understand the acidification of rain in Tokyo Metropolitan area. In this study, a long term trend of each ion concentration in precipitation and wet deposition was also investigated the base on the data we had observed at 7 sites for 10 years by the statistical method. 相似文献
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Kazuhiko Hayashi Yasuhito Igarashi Yukitomo Tsutsumi Yukiko Dokiya 《Water, air, and soil pollution》2001,130(1-4):1667-1672
Aerosol and precipitation samples were obtained at the summit of Mt. Fuji, the highest peak (3776m a.s.l.) in Japan, in the summers of 1997, 1998, and 1999. The mountaintop might be affected by valley wind during the afternoon, but is located in the free troposphere during the morning. The temporal variations of chemical species in the aerosol and precipitation samples correspond with meteorological conditions. The SO4 2? in the aerosol and precipitation exhibits high concentration with low temperature air mass, indicating the influence of long range transport from the Asian Continent. The contribution of the free troposphere to the chemical species obtained at the summit is estimated to be at least 30% during the summer season. 相似文献