Effects of drying and/or quenching histories on lateral tensile deformation properties of water-swollen wood     

Yuka Miyoshi  Tomoaki Kiryu  Keisuke Kojiro  Yuzo Furuta 《Journal of Wood Science》2015,61(5):525-528

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Establishment of a Model of Spontaneously-Running-Tokushima-Shikoku Rats with Left Atrial Thrombosis     

Takamasa Ohnishi  Fumiko Hisaoka  Masaki Morishima  Akira Takahashi  Nagakatsu Harada  Kazuaki Mawatari  Hidekazu Arai  Emiko Yoshioka  Satomi Toda  Izumi Keisuke  Yutaka Nakaya 《Journal of toxicologic pathology》2014,27(1):51-56

Studies that investigate the underlying mechanisms of disease and treatment options typically require the use of a suitable animal model. Few suitable animal models exist for left atrial thrombosis. Here, we demonstrated that the Spontaneously-Running-Tokushima-Shikoku (SPORTS) rat — a Wistar strain known for its running ability—is predisposed to the development of thrombi in the left atrium. We investigated the incidence of left atrial thrombosis in male (n = 16) and female (n = 17) SPORTS rats and observed organized atrial thrombosis in 57% and 38% of males and female rats, respectively. In the male rats, systolic blood pressures and heart rates were significantly higher in SPORTS rats than in control Wistar rats. We could not find any evidence of arrhythmias, such as atrial fibrillation, during electrocardiographic examination of SPORTS rats. We believe that the SPORTS rat could serve as a new research model for left atrial thrombosis; further, it may be suitable for research investigating the development of new antithrombotic approaches for the control of atrial thrombosis or familial thrombophilia in humans.  相似文献   

Estimation of the Optimal Timing of Fertilization for Embryo Development of In Vitro-Matured Bovine Oocytes Based on the Times of Nuclear Maturation and Sperm Penetration     

Keisuke KOYAMA  Sung-Sik KANG  Weiping HUANG  Yojiro YANAGAWA  Yoshiyuki TAKAHASHI  Masashi NAGANO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(5):653-659

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Supplementation of paprika as a carotenoid source in soft-dry pellets for broodstock yellowtail Seriola quinqueradiata (Temminck & Schlegel)     

R V Agius  T Watanabe  S Satoh  V Kiron  H Imaizumi  T Yamazaki  & K Kawano 《Aquaculture Research》2001,32(S1):263-272

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Accumulation of organotin compounds and marine birnavirus detection in Korean ascidians   总被引：1，自引：0，他引：1  

Kaoru Azumi  Shinji Nakamura  Shin-Ichi Kitamura  Sung-Ju Jung  Keisuke Kanehira  Hisato Iwata  Shinsuke Tanabe  Satoru Suzuki 《Fisheries Science》2007,73(2):263-269

ABSTRACT:   Recently, a serious disease spread extensively in aquaculture sites of the ascidian Halocynthia roretzi in Korea. To understand circumstances of ascidians in Korean aquaculture sites, residue levels of organotin compounds were analyzed, and detection of a marine birnavirus (MABV) in tissues of H. roretzi was attempted. Korean H. roretzi showed high concentrations of butyltins (mono, di, and tributyltins), especially in the gill, hepatopancreas, and digestive tract. However, there was no significant difference in the residues of butyltins in the hepatopancreas between diseased and non-diseased ascidians. The positive rate of MABV detection was high in the hepatopancreas, but also no significant difference was observed between diseased and non-diseased individuals. These observations suggest that an accumulation of tributyltin and a latency of MABV in H. roretzi tissues does not directly relate to the occurrence of the disease.  相似文献   

The role of the anal fin in fertilization success in male medaka, Oryzias latipes     

Yusuke Koseki  Keisuke Takata and  Koji Maekawa 《Fisheries Science》2000,66(4):633-635

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Soil nitrogen dynamics of forest ecosystems under environmental changes     

Hideaki Shibata  Hiroto Toda  Yoshiyuki Inagaki  Ryunosuke Tateno  Keisuke Koba  Takeshi Tange 《Journal of Forest Research》2011,16(5):331-332

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Atmospheric deposition and leaching of nitrogen in Chinese forest ecosystems     

Yunting?FangEmail author  Per?Gundersen  Rolf?D.?Vogt  Keisuke?Koba  Fusheng?Chen  Xi?Yun?Chen  Muneoki?Yoh 《Journal of Forest Research》2011,16(5):341-350

Data have been compiled from published sources on nitrogen (N) fluxes in precipitation, throughfall, and leaching from 69 forest ecosystems at 50 sites throughout China, to examine at a national level: (1) N input in precipitation and throughfall, (2) how precipitation N changes after the interaction with canopy, and (3) whether N leaching increases with increasing N deposition and, if so, to what extent. The deposition of dissolved inorganic N (DIN) in precipitation ranged from 2.6 to 48.2 kg N ha⁻¹ year⁻¹, with an average of 16.6 kg N ha⁻¹ year⁻¹. Ammonium was the dominant form of N at most sites, accounting for, on average, 63% of total inorganic N deposition. Nitrate accounted for the remaining 37%. On average, DIN fluxes increased through forest canopies, by 40% and 34% in broad-leaved and coniferous forests, respectively. No significant difference in throughfall DIN inputs was found between the two forest types. Overall, 22% of the throughfall DIN input was leached from forest ecosystems in China, which is lower than the 50–59% observed for European forests. Simple calculations indicate that Chinese forests have great potential to absorb carbon dioxide from the atmosphere, because of the large forest area and high N deposition.  相似文献   

Nondestructive measurement of cross-sectional shape of a tree trunk     

Akio Koizumi  Keisuke Ikeda  Kei Sawata  Takuro Hirai 《Journal of Wood Science》2011,57(4):276-281

To evaluate windthrow resistance with respect to stem breakage, a nondestructive method for determining the shape of trunk cross sections was developed. In this method, the coordinates of multiple gauge points set on the perimeter of a trunk are calculated by measuring the distances between them. The shape between the gauge points is generated with the use of a profile gauge placed between them. Measurement tests were conducted using profile gauges with lengths of 300 and 900 mm on model specimens with four shape patterns and four different diameters. The accuracy of the estimation was verified by comparing the section modulus calculated for the generated image and for the photograph. The average ratio of section modulus (generated/photo) for all specimens was 0.994, which indicates that the proposed method is highly accurate. The section moduli of hollow trunks can be evaluated using the profile method together with the drill resistance technique on the condition that 26% of the trunk diameter could be drilled without skew.  相似文献   

Forest Floor Quality and N Transformations in a Temperate Forest Affected by Avian-Derived N Deposition     

Satoru Hobara  Takashi Osono  Keisuke Koba  Naoko Tokuchi  Satomi Fujiwara  Kayoko Kameda 《Water, air, and soil pollution》2001,130(1-4):679-684

To evaluate the effects of avian-derived N deposition on forest C and N status, we investigated quantity and quality of litterfall, and chemical quality and N transformations in the forest floor from five sites that had been exposed to waterbird breeding colonies to differing degrees. The highest litterfall input of 2.6 t ha^?1 month^?1 was observed in the forest stand (Site 2) where intense bird breeding activity had been observed. Litterfall C/N was highest at the control site (no breeding activity) and decreased as the colonization stages advanced. Nitrogen concentration in litterfall and the forest floor was higher at those sites (Sites 3 and 4) where bird breeding had ceased and which represented the 'post-colony' situation, and consequently C/N and lignin/N of forest floor decreased. NH₄-N pool size in the forest floor was higher at Site 2, probably due to ongoing input and mineralization of bird excreta. Nitrification rate and percent nitrification were highest at Sites 3 and 4. From these results we conclude that study sites exposed to bird colonies show signs of N excess even after colonies are abandoned.  相似文献