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Takuya Ito,Shingo Kaneko,Masashi Yokogawa,송관필,최혁재,Yuji Isagi 한국식물분류학회 2013 식물 분류학회지 Vol.43 No.1
Hydrangea luteovenosa is a critically endangered plant species of Jeju Island in Korea, though it is widely distributed in western Japan. We isolated and characterized five microsatellite loci in this species. The number of alleles ranged from 3 to 27, observed heterozygosity from 0.27 to 0.86, and expected heterozygosity from 0.34 to 0.91. The markers described here will be useful for investigating the genetic diversity, genetic structure, and gene flow of H. luteovenosa, and the genetic findings would contribute to the establishment of effective conservation measures for this species in Korea.
Choi, Hyeok-Jae,Ito, Takuya,Yokogawa, Masashi,Kaneko, Shingo,Suyama, Yoshihisa,Isagi, Yuji The Korean Society of Plant Taxonomists 2017 식물 분류학회지 Vol.47 No.1
The population status of Hydrangea luteovenosa Koidz. in Korea was investigated, with an emphasis on its genetic diversity. From field surveys, we obtained the only locality record for a wild population in Jeju Island, which contained 285 individuals in total. Genotyping was performed using five microsatellite markers for the all extant plants in Korea. Three Japanese populations were also genotyped for the comparative analyses. The genotyping result showed that the Jeju population consisted of only two multilocus genotypes, including identical heterozygous genotypes at two loci; it had been maintained mostly by vegetative reproduction; and although the Jeju population is geographically far from Japanese populations, all alleles observed in the Korean population were shared with Japanese populations, suggesting the possibility that H. luteovenosa in the Jeju Island had been recently migrated or introduced from Japan. Future ecological and genetic studies associated with negative effects of low genetic variation will be essential for determining the conservation direction of the threatened Korean population of this species.
Two-Degree-of-Freedom Control of a Stacker Crane
Minoru Sasaki,Toshimi Shimizu,Kengo Suzuki,Shingo Naito,Satoshi Ito 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a motion control of a stacker crane applying a two-degree-of-freedom control. The two-degree-of-freedom control system consists of a feed forward controller based on an inverse system and a feed backcontroller with suppressing the vibration effectively and stabilizing. Feedback control of the motion of the stacker crane is derived by considering the time rate of change of the total energy of the system. This approach has the advantage overthe conventional methods in the respect that it allows one to deal directly with the system’s partial differential equations without resorting to approximations. The paper concludes by presenting some numerical results and experimental results for a special case using a proposed control system. These results show that the two-degree-of-freedom control system can realize faster and precise tracking control of the flexible stacker crane system.
Foxf2 represses bone formation via Wnt2b/β-catenin signaling
Tanaka Tomoyuki,Takahashi Akira,Kobayashi Yutaka,Saito Masanori,Xiaolong Sun,Jingquan Chen,Ito Yoshiaki,Kato Tsuyoshi,Ochi Hiroki,Sato Shingo,Yoshii Toshitaka,Okawa Atsushi,Carlsson Peter,Inose Hiroyu 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Differentiation of mesenchymal stem cells (MSCs) into osteoblasts is a critical process for proper skeletal development and acquisition/maintenance of bone mass. However, since this regulatory mechanism has not yet been fully elucidated, the treatment of severe osteoporosis and fractures is a challenge. Here, through a comprehensive analysis of gene expression during the differentiation of MSCs into osteoblasts, we show that the forkhead transcription factor Foxf2 is a crucial regulator of this process. Foxf2 expression transiently increased during MSC osteoblastic differentiation. Overexpression of Foxf2 in MSCs inhibited osteoblastic differentiation, and conversely, knockdown of Foxf2 expression promoted this process. Osteoprogenitor-specific Foxf2 knockout mice developed a high bone mass phenotype due to increased bone formation. RNA-seq analysis and molecular experiments revealed that Foxf2 regulation of bone formation is mediated by Wnt2b. Knockdown of Foxf2 in mouse femurs enhanced bone regeneration in vivo. FOXF2 expression was correlated with hip bone mineral density in postmenopausal women with low bone mass. Finally, inhibition of FOXF2 promoted osteoblastic differentiation of human MSCs. This study uncovers a critical role of Foxf2 in the differentiation of MSCs into osteoblasts and provides insight into the pathogenesis associated with bone-related diseases such as osteoporosis and nonunion after fracture