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Kitamura, C.,Yasuda, Y.,Kobayashi, T.,Nomura, T.,Shimada, K. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.6
To evaluate direct and maternal effects on calf market weight (CMW) and carcass weight (CW) in Japanese Black cattle under an animal model, genetic parameters were estimated using 51,320 records of CMW and 11,944 records of CW, respectively. Direct and maternal heritabilities, and direct-maternal genetic correlation were estimated to be 0.22, 0.06 and 0.27 for CMW, and 0.23, 0.12 and -0.40 for CW, respectively. Correlation coefficient between maternal breeding values for CMW and CW was 0.521 for 157 sires appeared in both CMW and CW data sets. These results suggest that the maternal genetic effect on pre-weaning growth carries over to carcass weight. Maternal breeding values for both calf market weight and carcass weight could be used as the indicator traits of maternal ability in Japanese Black cattle.
Temperature - Dependent Micro Crack Healing Process
Kitamura, Kaxuhiro,Maksimov, Igor L .,Nishioka, Kazumi 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.6
The crack healing process is studied theoretically on the basis of the extended the Thomson-Obreimoff model. The system free-energy F as a function of the crack length l and temperature T is calculated using the self-consistent Einstein model. It is found that with the temperature increase, the energy barrier becomes lower and even disappears at the $quot;healing$quot; temperature T=T_h. It is demonstrated that the crack-lattice trapping in the Obreimoff model is controlled by the free-energy barrier height OF(T). The latter exhibits the universal power-law behavior. On the basis of the results obtained, the crack healing time is evaluated.
Differentiation of Lymphocystis Disease Virus Genotype by Multiplex PCR
Kitamura Shin Ichi,Jung Sung-Ju,Oh Myung-Joo The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.2
Lymphocystis disease virus (LCDV) is the causative agent of lymphocystis disease. The viruses have been divided into three genotypes (genotype I for LCDV-1, II for Japanese flounder isolates, and III for rockfish isolates) on the basis of major capsid protein (MCP) gene sequences. In this study, we developed a multiplex PCR primer set in order to distinguish these genotypes. We also analyzed the MCP gene of a new LCDV isolate from the sea bass (SB98Yosu). Comparison of sequence identities between SB98Yosu and eight Japanese flounder isolates, revealed identity of more than 90.1 % at nucleotide level and 96.5% at deduced amino acid level, respectively. Phylogenetic analyses based on the MCP gene showed that SB98Yosu belongs to genotype II, along with Japanese flounder isolates. Multiplex PCR based on the MCP gene allowed us to identify these genotypes in a simple and rapid manner, even in a sample that contained two genotypes, in this case genotypes II and III.
Kei Kitamura,Shogo Hayashi,Zhe Wu Jin,Masahito Yamamoto,Gen Murakami,José Francisco Rodríguez-Vázquez,Hitoshi Yamamoto 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.1
Human fetal cervical vertebrae are characterized by the large zygapophysial joint (ZJ) extending posteriorly. During our recent studies on regional differences in the shape, extent, and surrounding tissue of the fetal ZJ, we incidentally found a cervical-specific structure of synovial tissues. This study aimed to provide a detailed evaluation of the synovial structure using sagittal and horizontal sections of 20 near-term fetuses. The cervical ZJ consistently had a large cavity with multiple recesses at the margins and, especially at the anterior end, the recess interdigitated with or were located close to tree-like tributaries of the veins of the external vertebral plexus. In contrast to the flat and thin synovial cell lining of the recess, the venous tributary had cuboidal endothelial cells. No or few elastic fibers were identified around the ZJ. The venous-synovial complex seems to be a transient morphology at and around birth, and it may play a role in the stabilization of the growing cervical ZJ against frequent spontaneous dislocation reported radiologically in infants. The venous-synovial complex in the cervical region should be lost and replaced by elastic fibers in childhood or adolescence. However, the delayed development of the ligament flavum is also likely to occur in the lumbar ZJ in spite of no evidence of a transient venous-synovial structure. The cuboidal venous endothelium may simply represent the high proliferation rate for the growing complex.