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Modeling and Simulation of the Magnetic Method for High Voltage Direct Current Inspection Robot
Xian-jin Xu,Cheng-hui Liu,Yu Yan,Hao-da Chen,Lei Fang,Yun-long Wang,Long-hui Wu 한국자기학회 2018 Journal of Magnetics Vol.23 No.3
In order to solve the slipping problem of a two-arm-wheel combined inspection robot, a maglev system based on the magnetic field of a high voltage direct current (HVDC) is proposed. The magnetic system comprises of two parts: a magnetic levitation system and a magnetic drive system. The levitation component overcomes the gravity of the robot by the Ampere force generated by current-carrying coils in the magnetic field of HVDC. The drive component utilizes the Ampere force generated by current-carrying coils in the magnetic field of HVDC as the driving force. Simulation results of the model are compared with the calculated values. The results show that the magnetic levitation method and the magnetic drive method are theoretically feasible, and the model is accurate and effective, which is of great practical significance to the physical realization of the inspection robot.
Cat fertilization by mouse sperm injection
Jin, Yong-Xun,Cui, Xiang-Shun,Yu, Xian-Feng,Lee, Sung-Hyun,Wang, Qing-Ling,Gao, Wei-Wei,Xu, Yong-Nan,Sun, Shao-Chen,Kong, IL-Keun,Kim, Nam-Hyung Cambridge University Press 2012 Zygote Vol.20 No.4
<B>Summary</B><P>Interspecies intracytoplasmic sperm injection has been carried out to understand species-specific differences in oocyte environments and sperm components during fertilization. While sperm aster organization during cat fertilization requires a paternally derived centriole, mouse and hamster fertilization occur within the maternal centrosomal components. To address the questions of where sperm aster assembly occurs and whether complete fertilization is achieved in cat oocytes by interspecies sperm, we studied the fertilization processes of cat oocytes following the injection of cat, mouse, or hamster sperm. Male and female pronuclear formations were not different in the cat oocytes at 6 h following cat, mouse or hamster sperm injection. Microtubule asters were seen in all oocytes following intracytoplasmic injection of cat, mouse or hamster sperm. Immunocytochemical staining with a histone H3-m2K9 antibody revealed that mouse sperm chromatin is incorporated normally with cat egg chromatin, and that the cat eggs fertilized with mouse sperm enter metaphase and become normal 2-cell stage embryos. These results suggest that sperm aster formation is maternally dependent, and that fertilization processes and cleavage occur in a non-species specific manner in cat oocytes.</P>
Study on 3D Characterized Profile and Point Accuracies of Ground Micro-Pyramid-Structured Si Surface
Jin Xie,Yong-Xian Lu,Xu-Ran Liu,Yan-Jun Lu 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
It is very difficult to evaluate 3D profile accuracy of micro-machined surface due to the 3D characterization of its measured point cloud. Hence, three ideal point cloud models, which are grid point model, slash profile model and horizontal profile model, were constructed to register 3D measured point cloud of micro-machined surface and evaluate the accuracies of characterized profile and points. First, #400 and #600 diamond wheel V-tips were employed to fabricate non-integrated and integrated micro-pyramidstructured surfaces with 173 μm in depth and 0.865 in aspect ratio in Computer Numerical Control (CNC) grinding system,respectively; then a white light interferometer was utilized to measure the micro-ground surfaces; finally, registration accuracy and registration efficiency were investigated with regard to characterized profile and point accuracies. The results show that registration accuracy increases and registration efficiency decreases with increasing model point number, but they have little relation with the posture of measured point cloud. Registration error may converge to micro-ground form error when model point number is larger than measured point number. Moreover, the slash profile and horizontal profile models may register characterized profile and point more precisely than grid point model. The slash profile model can produce the best registration accuracy and efficiency. It is confirmed that the micro-ground form errors are 23.8 μm and 7.9 μm, the characterized profile errors are 37.2 μm and 19.0 μm and the characterized peak errors are 51.2 μm and 34.1 μm for non-integrated surface and integrated surface, respectively. As a result,a #600 diamond grinding wheel may be used to perform a precision micro-grinding in CNC grinding system.
Combined effects of three novel SNPs within goat LHX3 gene on milk performance
Jin-Biao Liu,Chu-Zhao Lei,Xian-Yong Lan,Yao Xu,Zhuan-Jian Li,Hong Chen 한국유전학회 2011 Genes & Genomics Vol.33 No.5
In this study, single nucleotide polymorphisms (SNPs) of LHX3 gene were detected by DNA sequencing based on DNA pools and PCR-RFLP method in 792 goats belonging to three Chinese indigenous breeds (Guanzhong dairy, Xinong Sannen dairy, Inner Mongolia white cashmere). The results revealed three novel mutations (AY923832:g.7778A>T; g.8035T>C;g.10592C>T), which were named as P2-DraI, P3-HinfI and P4-MspI loci, respectively. The linkage disequilibrium analysis demonstrated P3-HinfI and P4-MspI loci were strongly linked (r^2>0.33) in all the analyzed populations. Each SNP produced no significant (p>0.05) effects on milk performance. However,the two-loci and three–loci combined genotypes had more profound impacts on milk yield than in separation. The individuals with diplotype AATT (P2-DraI/P3-HinfI) showed significantly (p<0.05) higher milk yield than those with diplotypes ATTT, TTTT, ATTC, and AACC. Diplotype TTCCTT (P2-DraI/P3-HinfI/P4-MspI) carriers had significantly (p<0.05) higher milk yield than those with diplotypes ATTTCC and AACCTC. These combined effects of LHX3 gene polymorphisms indicated that this gene had significant effect on milk performance and its corresponding combined diplotypes could be regarded as potential genetic markers of milk performance.
Caibao Jin,Xiaojian Zhu,Min Xiao,Songya Liu,Xian Liu,Jingjing Liu,Xiuwen Xu,Shujuan Yi,Li Meng 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.2
Chronic myeloid leukemia (CML) is a clonal hematopoietic stem cell disorder characterized by a reciprocal translocation between the long arms of chromosomes 9 and 22, resulting in the formation of a Philadelphia (Ph) chromosome. Most chimeric BCR-ABL1 fusion transcripts are e13a2(b2a2) or e14a2(b3a2), encoding a 210-kDa protein, p210, but some are a e1a2 transcript or e19a2 transcript encoding a 190-kDa protein or a 230-kDa protein, respectively [1]
Tan, Dun-Xian,Zheng, Xiaodong,Kong, Jin,Manchester, Lucien C.,Hardeland, Ruediger,Kim, Seok Joong,Xu, Xiaoying,Reiter, Russel J. MDPI 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.9
<P>Melatonin and melatonin isomers exist and/or coexist in living organisms including yeasts, bacteria and plants. The levels of melatonin isomers are significantly higher than that of melatonin in some plants and in several fermented products such as in wine and bread. Currently, there are no reports documenting the presence of melatonin isomers in vertebrates. From an evolutionary point of view, it is unlikely that melatonin isomers do not exist in vertebrates. On the other hand, large quantities of the microbial flora exist in the gut of the vertebrates. These microorganisms frequently exchange materials with the host. Melatonin isomers, which are produced by these organisms inevitably enter the host’s system. The origins of melatonin and its isomers can be traced back to photosynthetic bacteria and other primitive unicellular organisms. Since some of these bacteria are believed to be the precursors of mitochondria and chloroplasts these cellular organelles may be the primary sites of melatonin production in animals or in plants, respectively. Phylogenic analysis based on its rate-limiting synthetic enzyme, serotonin <I>N</I>-acetyltransferase (SNAT), indicates its multiple origins during evolution. Therefore, it is likely that melatonin and its isomer are also present in the domain of archaea, which perhaps require these molecules to protect them against hostile environments including extremely high or low temperature. Evidence indicates that the initial and primary function of melatonin and its isomers was to serve as the first-line of defence against oxidative stress and all other functions were acquired during evolution either by the process of adoption or by the extension of its antioxidative capacity.</P>
Antibacterial Constituents from Fruit Bodies of Ascomyce Bulgaria inquinans
Peng Zhang,Xian Li,Ning Li,Jing Xu,Zhan-Lin Li,Yi Wang,Jin-Hui Wang 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.8
Two ergosterins and two triterpenoids were isolated from the dried fruit bodies of Ascomyce Bulgaria inquinans. By means of chemical (hydrolysis) and spectroscopic methods (NMR, EIMS), their structures were established as betuinic acid (1), cerevisterol (2), (24R)ergosta-7, 22Ediene- 3β, 5α, 6β-triol-3-O-palmitate (3) and ursolic acid (4). Compound 3 is a new compound.
Antibacterial Constituents from Fruit Bodies of Ascomyce Bulgaria inquinans
Zhang Peng,Li Xian,Li Ning,Xu Jing,Li Zhan-Lin,Wang Yi,Wang Jin-Hui The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.8
Two ergosterins and two triterpenoids were isolated from the dried fruit bodies of Ascomyce Bulgaria inquinans. By means of chemical (hydrolysis) and spectroscopic methods (NMR, EIMS), their structures were established as betuinic acid (1), cerevisterol (2), (24R)ergosta-7, $22Ediene-3\beta,\;5\alpha,\;6\beta-triol-3-O-palmitate$ (3) and ursolic acid (4). Compound 3 is a new compound.