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Airbag Damping of the Hollow Fiber Composite with Different Porosity in the Fiber Wall
Mingjun Li,Guoqun Zhou,Yongwen Xu,Guifang Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
The inner cavity of the hollow fiber with porosity in its fiber wall constitutes a damping airbag with slow passage of gas. The magnitude of the damping value of the airbag and its damping influencing factors need to be researched, which adds the nonlinear airbag damping to the damping of the raw materials and increases the total damping loss factor of the structure. In this paper, the hollow fiber damping materials with different hollow inside diameters, different fiber wall thicknesses, different wall porosity and different wall pore structure were prepared by adjusting and controlling the technological parameters of the hollow fiber spinning and the formula of spinning casting solution. Meanwhile, we have a comprehensive study on the relationship between the factors and performances. It was found and confirmed that the size of the airbag, the wall pore structure, the wall porosity and the wall thickness of the airbag were the most crucial parameters, which can affect the additional damping of the airbag in the hollow fiber. And the controlling method of the four key parameters was also obtained. Finally, the mechanism and effect of hollow fiber airbag damping was proved.
Xiujuan Wu,Yujia Wang,Qiong Wu,Yi Li,Li Li,Jing Tang,Yujun Shi,Hong Bu,Ji Bao,Mingjun Xie 한국조직공학과 재생의학회 2015 조직공학과 재생의학 Vol.12 No.6
Liver disease affects millions of patients each year worldwide. Decellularized biologic matrices are plausible biomedical materials for bioengineered replacement hepatic tissue. However, one of the concerns for its safe medical application is the lack of objective assessment of the immunogen within the materials and in vivo immune responses to the matrices. The purpose of this study was to produce immunogen- reduced and biocompatible matrices from porcine liver. Whole porcine livers were perfusion decellularized and cross-linked with glutaraldehyde (GA) or genipin (GP). Proteins were extracted, and the migratory response of human leukocytes toward protein extracts was examined using an in vitro migration chamber. In addition, biopsy specimens of decellularized scaffolds were implanted subcutaneously into rodents to investigate scaffold immunogenicity. Histological staining confirmed cellular clearance from pig livers, with removal of nuclei and cytoskeletal components and widespread preservation of structural extracellular molecules. Polymerase chain reaction analysis showed that galactose-alpha-1,3-galactose-beta-1,4-N-acetylglucosamine (1,3 gal), swine leukocyte antigen, and porcine endogenous retrovirus were completely removed in the matrices. Decellularization significantly reduced the migration of monocytes compared with native porcine tissue. Although the proportion of transmigrating lymphocytes was much lower, repeating the cross-linking procedure reduced the migratory response. After implantation for 4 weeks, the decellularized and native samples were degraded, and the GA-treated group demonstrated a severe inflammatory reaction; however, minimal inflammatory cell infiltration was seen in the GPtreated group during the 8-week investigation period. In conclusion, our study provided evidence that GP crosslinking could significantly reduce the immunogenicity of decellularized liver biomaterials.
Li-Jun Tang,Pei Zhou,Zhikai Qi,Zhenlong Huang,Jia Zhao,Mingjun Cai 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
A new quinoline-based acylhydrazone (1) has been synthesized and applied as a fluorescent probe. Probe 1 exhibits high selectivity and sensitivity to Cu2+ with fluorescence “ON-OFF” behavior in HEPES buffered (1‰ DMSO, HEPES 20 mM, pH = 7.4) solution. The on-site generated 1-Cu2+ complex displays excellent selectivity to sulfide ions with fluorescence “OFF-ON” performance through copper displacement approach.
Li-Jun Tang,Pei Zhou,Zhenlong Huang,Jia Zhao,Mingjun Cai 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
Fluorescent and colorimetric recognition properties of 2-(4-N-phenyl-3-thiosemicarbazone)-8-hydroxyquinoline (1) in buffered aqueous solution (1% DMSO, HEPES 20 mM, pH = 7.4) have been examined. Sensor 1 displays highly selective and sensitive recognition to Cu2+ with fluorescence “ON-OFF” performance. The in situ formed 1-Cu2+ complex exhibits an excellent selectivity toward sulfide ions with fluorescence “OFF-ON” behavior via Cu2+ displacement approach. Thus, relay recognition of Cu2+ and sulfide by a known molecule 1 has been achieved.
Qi Li,Qingzhi Wang,Mingjun Qi,Jianlong Ge,Rihao Cong 한국유전학회 2011 Genes & Genomics Vol.33 No.3
A total of 113 novel EST-derived simple sequence repeat (EST-SSR) markers were developed in the Pacific oyster (Crassotrea gigas). Polymorphisms of these markers were evaluated in a wild population of 30 individuals. The number of alleles per locus ranged from 2 to 27 with an average of 6.3, and the observed and expected heterozygosities varied from 0 to 0.9667 and from 0.0333 to 0.9701, respectively. Mendelian segregations were tested for 24 of the markers that were polymorphic in one family produced by single-pair mating. Null alleles were discovered at four loci. Nine tests of segregation ratios revealed significant departures from expected Mendelian ratios. As a useful addition to the collection of the microsatellites that are now available for C. gigas, these EST-SSR markers will help the advance in investigation of QTL mapping and genetic diversity in this species.