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Acute Toxicity of Gamma Radiation to the Monogonont Rotifer Brachionus koreanus
Won, E. J.,Han, J.,Hagiwara, A.,Oda, S.,Mitani, H.,Lee, J. S. Springer Science + Business Media 2016 Bulletin of environmental contamination and toxico Vol.97 No.3
<P>We examined the tolerance of the monogonont rotifer Brachionus koreanus in response to gamma radiation. In order to determine the median lethal dose (LD50) of rotifers against gamma radiation, we irradiated B. koreanus with gamma rays from 0 to 7000 grays (Gy). The LD50s were 2900 and 2300 Gy at 24 h (LD50-24 h) and 96 h (LD50-96 h) after irradiation, respectively. In addition, the no observed effect levels (NOEL) were 1500 and 1000 Gy at 24 and 96 h, respectively. This is the first determination of lethal doses of gamma radiation for B. koreanus, which could be useful in ecological assessment of gamma radiation toward aquatic life and could be useful for understanding toxic mechanisms over sublethal doses.</P>
Kondo-like behavior in magnetic and thermal properties of single-crystalTm5Si2Ge2
Kim, J. H.,Kim, S. J.,Lee, C. I.,Jung, M. A.,Oh, H. J.,Rhyee, Jong-Soo,Jo, Younghun,Mitani, Hiroyuki,Miyazaki, Hidetoshi,Kimura, Shin-ichi,Kwon, Y. S. American Physical Society 2010 Physical review. B, Condensed matter and materials Vol.81 No.10
Wang, X.B.,Ogawa, T.,Suda, S.,Taniguchi, K.,Uike, H.,Kumagai, H.,Mitani, K. Asian Australasian Association of Animal Productio 1998 Animal Bioscience Vol.11 No.4
Six Holstein heifer calves weaned at 45 days-of-age were randomly allocated into high daily gain (1.1 kg/d, HDG) and low daily gain (0.56 kg/d, LDG) groups, and were slaughtered at 170 kg of live weight. Energy intake level in the feeding period was 2.4 $\times$ maintenance in 105 days for HDG and 1.4 $\times$ maintenance in 216 days for LDG calves. Total length of the small intestine was identical between groups, but both weights of the pancreas and of the small intestinal mucosa were greater (p < 0.01) for HDG calves. Alpha-amylase, lipase, proteinase, and trypsin activities of the whole pancreas were higher (p < 0.05) in HDG calves. Disaccharidase activity of the whole small intestinal mucosa was also higher (p < 0.10) for HDG than for LDG calves. However, the enzymatic activities, expressed as per gram or per protein of the pancreas and the small intestinal mucosa, were not affected (p > 0.10) by the plane of nutrition. These results suggest that the digestive enzyme activity in the small intestine varies primarily with the weight of tissues synthesizing the enzyme.