1
|
Park SY, Do SH, Choi KY, Jang D, Jang TH, Scheffer J, Wu CM, Gardner JS, Park JMS, Park JH, Ji S. Emergence of the isotropic Kitaev honeycomb latticeα-RuCl 3and its magnetic properties. J Phys Condens Matter 2024; 36:215803. [PMID: 38354419 DOI: 10.1088/1361-648x/ad294f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 02/14/2024] [Indexed: 02/16/2024]
Abstract
We present a comprehensive investigation of the crystal and magnetic structures of the van der Waals antiferromagnetα-RuCl3using single crystal x-ray and neutron diffraction. The crystal structure at room temperature is a monoclinic (C2/m). However, with decreasing temperature, a remarkable first-order structural phase transition is observed, leading to the emergence of a rhombohedral (R3-) structure characterized by three-fold rotational symmetry forming an isotropic honeycomb lattice. On further cooling, a zigzag-type antiferromagnetic order develops belowTN=6∼6.6K. The critical exponent of the magnetic order parameter was determined to beβ=0.11(1), which is close to the two-dimensional Ising model. Additionally, the angular dependence of the magnetic critical field of the zigzag antiferromagnetic order for the polarized ferromagnetic phase reveals a six-fold rotational symmetry within theab-plane. These findingsreflect the symmetry associated with the Ising-like bond-dependent Kitaev spin interactions and underscore the universality of the Kitaev interaction-dominated antiferromagnetic system.
Collapse
Affiliation(s)
- Sang-Youn Park
- Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Pohang Accelerator Laboratory, POSTECH, Pohang 37673, Republic of Korea
| | - Seung-Hwan Do
- Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, United States of America
| | - Kwang-Yong Choi
- Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - D Jang
- Center for Thermometry and Fluid Flow Metrology, Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - Tae-Hwan Jang
- Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - J Scheffer
- Laboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institut, Villigen PSI CH-5232, Switzerland
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - J S Gardner
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America
- Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia
| | - J M S Park
- Advanced Quantum Materials Research Section, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Jae-Hoon Park
- Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Sungdae Ji
- Advanced Quantum Materials Research Section, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| |
Collapse
|
2
|
Curvello R, Raghuwanshi VS, Wu CM, Mata J, Garnier G. Nano- and Microstructures of Collagen-Nanocellulose Hydrogels as Engineered Extracellular Matrices. ACS Appl Mater Interfaces 2024; 16:1370-1379. [PMID: 38117479 DOI: 10.1021/acsami.3c10353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The extracellular matrix (ECM) is the fundamental acellular element of human tissues, providing their mechanical structure while delivering biomechanical and biochemical signals to cells. Three-dimensional (3D) tissue models commonly use hydrogels to recreate the ECM in vitro and support the growth of cells as organoids and spheroids. Collagen-nanocellulose (COL-NC) hydrogels rely on the blending of both polymers to design matrices with tailorable physical properties. Despite the promising application of these biomaterials in 3D tissue models, the architecture and network organization of COL-NC remain unclear. Here, we investigate the structural effects of incorporating NC fibers into COL hydrogels by small-angle neutron scattering (SANS) and ultra-SANS (USANS). The critical hierarchical structure parameters of fiber dimensions, interfiber distance, and coassembled open structures of NC and COL in the absence and presence of cells were determined. We found that NC expanded and increased the homogeneity in the COL network without affecting the inherent fiber properties of both polymers. Cells cultured as spheroids in COL-NC remodeled the hydrogel network without a significant impact on its architecture. Our study reveals the polymer organization of COL-NC hydrogels and demonstrates SANS and USANS as exceptional techniques to reveal nano- and micron-scale details on polymer organization, which leads to a better understanding of the structural properties of hydrogels to engineer novel ECMs.
Collapse
Affiliation(s)
- Rodrigo Curvello
- Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Vikram Singh Raghuwanshi
- Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Chun-Ming Wu
- Australian Centre for Neutron Scattering (ACNS), Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Height, New South Wales 2234, Australia
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - Jitendra Mata
- Australian Centre for Neutron Scattering (ACNS), Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Height, New South Wales 2234, Australia
- School of Chemistry, University of New South Wales, Sydney 2052, Australia
| | - Gil Garnier
- Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
| |
Collapse
|
3
|
Raghuwanshi VS, Joram Mendoza D, Browne C, Ayurini M, Gervinskas G, Hooper JF, Mata J, Wu CM, Simon GP, Garnier G. Effect of temperature on the conformation and functionality of poly(N-isopropylacrylamide) (PNIPAM)-grafted nanocellulose hydrogels. J Colloid Interface Sci 2023; 652:1609-1619. [PMID: 37666193 DOI: 10.1016/j.jcis.2023.08.152] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 09/06/2023]
Abstract
HYPOTHESIS Poly(N-isopropylacrylamide) [PNIPAM]-grafted cellulose nanofibers (CNFs) are new thermo-responsive hydrogels which can be used for a wide range of applications. Currently, there is no clear understanding of the precise mechanism by which CNFs and PNIPAM interact together. Here, we hypothesize that the physical crosslinking of grafted PNIPAM on CNF inhibits the free movement of individual CNF, which increases the gel strength while sustaining its thermo-responsive properties. EXPERIMENTS The thermo-responsive behaviour of PNIPAM-grafted CNFs (PNIPAM-g-CNFs), synthesized via silver-catalyzed decarboxylative radical polymerization, and PNIPAM-blended CNFs (PNIPAM-b-CNFs) was studied. Small angle neutron scattering (SANS) combined with Ultra-SANS (USANS) revealed the nano to microscale conformation changes of these polymer hybrids as a function of temperature. The effect of temperature on the optical and viscoelastic properties of hydrogels was also investigated. FINDINGS Grafting PNIPAM from CNFs shifted the lower critical solution temperature (LCST) from 32 °C to 36 °C. Below LCST, the PNIPAM chains in PNIPAM-g-CNF sustain an open conformation and poor interaction with CNF, and exhibit water-like behaviour. At and above LCST, the PNIPAM chains change conformation to entangle and aggregate nearby CNFs. Large voids are formed in solution between the aggregated PNIPAM-CNF walls. In comparison, PNIPAM-b-CNF sustains liquid-like behaviour below LCST. At and above LCST, the blended PNIPAM phase separates from CNF to form large aggregates which do not affect CNF network and thus PNIPAM-b-CNF demonstrates low viscosity. Understanding of temperature-dependent conformation of PNIPAM-g-CNFs engineer thermo-responsive hydrogels for biomedical and functional applications.
Collapse
Affiliation(s)
- Vikram Singh Raghuwanshi
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia.
| | - David Joram Mendoza
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Christine Browne
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Meri Ayurini
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Gediminas Gervinskas
- Ramaciotti Centre for Cryo-electron Microscopy, Monash University, Clayton, Victoria 3800, Australia
| | - Joel F Hooper
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia; School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Jitendra Mata
- Australian Centre for Neutron Scattering (ACNS), Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2234, Australia; School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Chun-Ming Wu
- Australian Centre for Neutron Scattering (ACNS), Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2234, Australia; National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - George P Simon
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia; Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Gil Garnier
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia.
| |
Collapse
|
4
|
Melethil K, Kumar MS, Wu CM, Shen HH, Vedhanarayanan B, Lin TW. Recent Progress of 2D Layered Materials in Water-in-Salt/Deep Eutectic Solvent-Based Liquid Electrolytes for Supercapacitors. Nanomaterials (Basel) 2023; 13:1257. [PMID: 37049350 PMCID: PMC10097202 DOI: 10.3390/nano13071257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 03/27/2023] [Accepted: 04/01/2023] [Indexed: 06/19/2023]
Abstract
Supercapacitors are candidates with the greatest potential for use in sustainable energy resources. Extensive research is being carried out to improve the performances of state-of-art supercapacitors to meet our increased energy demands because of huge technological innovations in various fields. The development of high-performing materials for supercapacitor components such as electrodes, electrolytes, current collectors, and separators is inevitable. To boost research in materials design and production toward supercapacitors, the up-to-date collection of recent advancements is necessary for the benefit of active researchers. This review summarizes the most recent developments of water-in-salt (WIS) and deep eutectic solvents (DES), which are considered significant electrolyte systems to advance the energy density of supercapacitors, with a focus on two-dimensional layered nanomaterials. It provides a comprehensive survey of 2D materials (graphene, MXenes, and transition-metal oxides/dichalcogenides/sulfides) employed in supercapacitors using WIS/DES electrolytes. The synthesis and characterization of various 2D materials along with their electrochemical performances in WIS and DES electrolyte systems are described. In addition, the challenges and opportunities for the next-generation supercapacitor devices are summarily discussed.
Collapse
Affiliation(s)
- Krishnakumar Melethil
- Department of Chemistry, Tunghai University, No.1727, Sec.4, Taiwan Boulevard, Xitun District, Taichung City 40704, Taiwan
| | - Munusamy Sathish Kumar
- Department of Chemistry, Tunghai University, No.1727, Sec.4, Taiwan Boulevard, Xitun District, Taichung City 40704, Taiwan
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Hsin-Hui Shen
- Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Balaraman Vedhanarayanan
- Department of Chemistry, Tunghai University, No.1727, Sec.4, Taiwan Boulevard, Xitun District, Taichung City 40704, Taiwan
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Tsung-Wu Lin
- Department of Chemistry, Tunghai University, No.1727, Sec.4, Taiwan Boulevard, Xitun District, Taichung City 40704, Taiwan
| |
Collapse
|
5
|
Tsai WJ, Lai YH, Shi YA, Hammel M, Duff AP, Whitten AE, Wilde KL, Wu CM, Knott R, Jeng US, Kang CY, Hsu CY, Wu JL, Tsai PJ, Chiang-Ni C, Wu JJ, Lin YS, Liu CC, Senda T, Wang S. Structural basis underlying the synergism of NADase and SLO during group A Streptococcus infection. Commun Biol 2023; 6:124. [PMID: 36721030 PMCID: PMC9887584 DOI: 10.1038/s42003-023-04502-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 01/18/2023] [Indexed: 02/02/2023] Open
Abstract
Group A Streptococcus (GAS) is a strict human pathogen possessing a unique pathogenic trait that utilizes the cooperative activity of NAD+-glycohydrolase (NADase) and Streptolysin O (SLO) to enhance its virulence. How NADase interacts with SLO to synergistically promote GAS cytotoxicity and intracellular survival is a long-standing question. Here, the structure and dynamic nature of the NADase/SLO complex are elucidated by X-ray crystallography and small-angle scattering, illustrating atomic details of the complex interface and functionally relevant conformations. Structure-guided studies reveal a salt-bridge interaction between NADase and SLO is important to cytotoxicity and resistance to phagocytic killing during GAS infection. Furthermore, the biological significance of the NADase/SLO complex in GAS virulence is demonstrated in a murine infection model. Overall, this work delivers the structure-functional relationship of the NADase/SLO complex and pinpoints the key interacting residues that are central to the coordinated actions of NADase and SLO in the pathogenesis of GAS infection.
Collapse
Affiliation(s)
- Wei-Jiun Tsai
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yi-Hsin Lai
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yong-An Shi
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Michal Hammel
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Anthony P Duff
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Andrew E Whitten
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Karyn L Wilde
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, Taiwan
| | - Robert Knott
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, Taiwan
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Chia-Yu Kang
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chih-Yu Hsu
- Department of Medical Laboratory Science and Biotechnology, National Cheng Kung University, Medical College, Tainan, Taiwan
| | - Jian-Li Wu
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Pei-Jane Tsai
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Medical Laboratory Science and Biotechnology, National Cheng Kung University, Medical College, Tainan, Taiwan
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
| | - Chuan Chiang-Ni
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Microbiology and Immunology, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Molecular Infectious Disease Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Jiunn-Jong Wu
- Department of Medical Laboratory Science and Biotechnology, Asia University, Taichung, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
| | - Yee-Shin Lin
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
| | - Ching-Chuan Liu
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Toshiya Senda
- Structural Biology Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, Japan
| | - Shuying Wang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan.
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan.
| |
Collapse
|
6
|
Lai X, Han ML, Ding Y, Chow SH, Le Brun AP, Wu CM, Bergen PJ, Jiang JH, Hsu HY, Muir BW, White J, Song J, Li J, Shen HH. A polytherapy based approach to combat antimicrobial resistance using cubosomes. Nat Commun 2022; 13:343. [PMID: 35039508 PMCID: PMC8763928 DOI: 10.1038/s41467-022-28012-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 12/07/2021] [Indexed: 12/21/2022] Open
Abstract
A depleted antimicrobial drug pipeline combined with an increasing prevalence of Gram-negative ‘superbugs’ has increased interest in nano therapies to treat antibiotic resistance. As cubosomes and polymyxins disrupt the outer membrane of Gram-negative bacteria via different mechanisms, we herein examine the antimicrobial activity of polymyxin-loaded cubosomes and explore an alternative strategy via the polytherapy treatment of pathogens with cubosomes in combination with polymyxin. The polytherapy treatment substantially increases antimicrobial activity compared to polymyxin B-loaded cubosomes or polymyxin and cubosomes alone. Confocal microscopy and neutron reflectometry suggest the superior polytherapy activity is achieved via a two-step process. Firstly, electrostatic interactions between polymyxin and lipid A initially destabilize the outer membrane. Subsequently, an influx of cubosomes results in further membrane disruption via a lipid exchange process. These findings demonstrate that nanoparticle-based polytherapy treatments may potentially serve as improved alternatives to the conventional use of drug-loaded lipid nanoparticles for the treatment of “superbugs”. An increasing prevalence of Gram-negative bacteria increases the interest in nanotherapies to treat antibiotic resistance. Here, the authors examine the antimicrobial activity of polymyxin-loaded cubosomes and explore a polytherapy treatment of pathogens with cubosomes in combination with polymyxin.
Collapse
Affiliation(s)
- Xiangfeng Lai
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, VIC, 3800, Australia
| | - Mei-Ling Han
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC, 3800, Australia
| | - Yue Ding
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, VIC, 3800, Australia.,Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Seong Hoong Chow
- Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Anton P Le Brun
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW, 2232, Australia
| | - Chun-Ming Wu
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW, 2232, Australia.,National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Phillip J Bergen
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC, 3800, Australia
| | - Jhih-Hang Jiang
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC, 3800, Australia
| | - Hsien-Yi Hsu
- School of Energy and Environment & Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China.,Shenzhen Research Institute of City University of Hong Kong, 518057, Shenzhen, China
| | | | | | - Jiangning Song
- Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Jian Li
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC, 3800, Australia.
| | - Hsin-Hui Shen
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, VIC, 3800, Australia. .,Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia.
| |
Collapse
|
7
|
Ma MH, Batsaikhan E, Chen HN, Chen TY, Lee CH, Li WH, Wu CM, Wang CW. Non-conventional superconductivity in magnetic In and Sn nanoparticles. Sci Rep 2022; 12:775. [PMID: 35031677 PMCID: PMC8760274 DOI: 10.1038/s41598-022-04889-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 12/21/2021] [Indexed: 11/23/2022] Open
Abstract
We report on experimental evidence of non-conversional pairing in In and Sn nanoparticle assemblies. Spontaneous magnetizations are observed, through extremely weak-field magnetization and neutron-diffraction measurements, to develop when the nanoparticles enter the superconducting state. The superconducting transition temperature TC shifts to a noticeably higher temperature when an external magnetic field or magnetic Ni nanoparticles are introduced into the vicinity of the superconducting In or Sn nanoparticles. There is a critical magnetic field and a critical Ni composition that must be reached before the magnetic environment will suppress the superconductivity. The observations may be understood when assuming development of spin-parallel superconducting pairs on the surfaces and spin-antiparallel superconducting pairs in the core of the nanoparticles.
Collapse
Affiliation(s)
- Ma-Hsuan Ma
- Department of Physics, National Central University, Zhongli, 32001, Taiwan
| | | | - Huang-Nan Chen
- Department of Physics, National Central University, Zhongli, 32001, Taiwan
| | - Ting-Yang Chen
- Department of Physics, National Central University, Zhongli, 32001, Taiwan
| | - Chi-Hung Lee
- Department of Physics, National Central University, Zhongli, 32001, Taiwan
| | - Wen-Hsien Li
- Department of Physics, National Central University, Zhongli, 32001, Taiwan.
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Chin-Wei Wang
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| |
Collapse
|
8
|
Kunene SC, Lin KS, Weng MT, Carrera Espinoza MJ, Wu CM. In vitro study of doxorubicin-loaded thermo- and pH-tunable carriers for targeted drug delivery to liver cancer cells. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.08.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
9
|
Hong JW, Jian YQ, Liao YP, Hung HH, Huang TY, Nelson A, Tsao IY, Wu CM, Sun YS. Distributions of Deuterated Polystyrene Chains in Perforated Layers of Blend Films of a Symmetric Polystyrene -block-poly(methyl methacrylate). Langmuir 2021; 37:13046-13058. [PMID: 34696591 DOI: 10.1021/acs.langmuir.1c02132] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We have examined the spatial distributions of polymer chains in blend films of weakly segregated polystyrene-block-poly(methyl methacrylate) [P(S-b-MMA)] and deuterated polystyrene (dPS). By fine-tuning the composition (ϕPS+dPS = 63.8 vol %) of the total PS/dPS component and annealing temperature (230 and 270 °C), P(S-b-MMA)/dPS blend films mainly form perforated layers with a parallel orientation (hereafter PLs//). The distributions of dPS in PLs// were probed by grazing-incidence small-angle neutron scattering (GISANS) and time-of-flight neutron reflectivity (ToF-NR). GISANS and ToF-NR results offer evidence that dPS chains preferentially locate at the free surface and within the PS layers for blend films that were annealed at 230 °C. Upon annealing at 270 °C, dPS chains distribute within PS layers and perforated PMMA layers. Nevertheless, dPS chains still retain a surface preference for thin films. In contrast, such surface segregation of dPS chains is prohibited for thick films when annealed at 270 °C.
Collapse
Affiliation(s)
- Jia-Wen Hong
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Yi-Qing Jian
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Yin-Ping Liao
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Hsiang-Ho Hung
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Tzu-Yen Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Andrew Nelson
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - I-Yu Tsao
- Institute of Materials Science and Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Ya-Sen Sun
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| |
Collapse
|
10
|
Kangarlou B, Dahanayake R, Martin IJ, Ndaya D, Wu CM, Kasi RM, Dormidontova EE, Nieh MP. Flower-like Micelles of Polyethylene Oxide End-Capped with Cholesterol. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Behrad Kangarlou
- Materials Science Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Rasika Dahanayake
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Ian J. Martin
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Dennis Ndaya
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Chun-Ming Wu
- The Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, New South Wales 2234, Australia
| | - Rajeswari M. Kasi
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Mu-Ping Nieh
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
| |
Collapse
|
11
|
Yang HC, Lin SW, Ge YC, Huang MY, Yang CH, Liu WM, Duff AP, Wu CM, Lan YK, Su AC, Yeh YQ, Jeng US, Chou PT. Probing protein structures in solution by molecular dynamics simulation and small-angle X-ray scattering. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321089923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
12
|
Ma JY, Hsu KL, Mata JP, Wu CM, Lo CT. Solvency and salt addition influence the photoresponsivity and fluorescence in an azobenzene-containing block copolymer. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
13
|
Ding Y, Chow SH, Chen J, Brun APL, Wu CM, Duff AP, Wang Y, Song J, Wang JH, Wong VH, Zhao D, Nishimura T, Lee TH, Conn CE, Hsu HY, Bui BV, Liu GS, Shen HH. Targeted delivery of LM22A-4 by cubosomes protects retinal ganglion cells in an experimental glaucoma model. Acta Biomater 2021; 126:433-444. [PMID: 33774200 DOI: 10.1016/j.actbio.2021.03.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 03/18/2021] [Accepted: 03/18/2021] [Indexed: 02/08/2023]
Abstract
Glaucoma, a major cause of irreversible blindness worldwide, is associated with elevated intraocular pressure (IOP) and progressive loss of retinal ganglion cells (RGCs) that undergo apoptosis. A mechanism for RGCs injury involves impairment of neurotrophic support and exogenous supply of neurotrophic factors has been shown to be beneficial. However, neurotrophic factors can have widespread effects on neuronal tissues, thus targeting neurotrophic support to injured neurons may be a better neuroprotective strategy. In this study, we have encapsulated LM22A-4, a small neurotrophic factor mimetic, into Annexin V-conjugated cubosomes (L4-ACs) for targeted delivery to injured RGCs in a model of acute IOP elevation, which is induced by acute IOP elevation. We have tested cubosomes formulations that encapsulate from 9% to 33% LM22A-4. Our data indicated that cubosomes encapsulating 9% and 17% LM22A-4 exhibited a mixture of Pn3m/Im3m cubic phase, whereas 23% and 33% showed a pure Im3m cubic phase. We found that 17% L4-ACs with Pn3m/Im3m symmetries showed better in-situ and in-vitro lipid membrane interactions than the 23% and 33% L4-ACs with Im3m symmetry. In vivo experiments showed that 17% L4-ACs targeted the posterior retina and the optic nerve head, which prevented RGCs loss and improved functional outcomes in a mouse model of acute IOP elevation. These results provide evidence that Annexin V-conjugated cubosomes-based LM22A-4 delivery may be a useful targeted approach to prevent the progression of RGCs loss in glaucoma. STATEMENT OF SIGNIFICANCE: Recent studies suggest that the therapy of effectively delivering neurotrophic factors to the injured retinal ganglion cells (RGCs) could promote the survival of RGCs in glaucoma. Our present work has for the first time used cubosomes as an active targeted delivery system and have successfully delivered a neuroprotective drug to the damaged RGCs in vivo. Our new cubosomal formulation can protect apoptotic cell death in vitro and in vivo, showing that cubosomes are a promising drug carrier system for ocular drug delivery and glaucoma treatment. We have further found that by controlling cubosomes in Pn3m phase we can facilitate delivery of neuroprotective drug through apoptotic membranes. This data, we believe, has important implications for future design and formulation of cubosomes for therapeutic applications.
Collapse
|
14
|
Mdlovu NV, Lin KS, Chen Y, Wu CM. Formulation of magnetic nanocomposites for intracellular delivery of micro-RNA for MYCN inhibition in neuroblastoma. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126264] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
15
|
Chen X, Ding Y, Bamert RS, Le Brun AP, Duff AP, Wu CM, Hsu HY, Shiota T, Lithgow T, Shen HH. Substrate-dependent arrangements of the subunits of the BAM complex determined by neutron reflectometry. Biochim Biophys Acta Biomembr 2021; 1863:183587. [PMID: 33639106 DOI: 10.1016/j.bbamem.2021.183587] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 02/09/2021] [Accepted: 02/17/2021] [Indexed: 12/22/2022]
Abstract
In Gram-negative bacteria, the β-barrel assembly machinery (BAM) complex catalyses the assembly of β-barrel proteins into the outer membrane, and is composed of five subunits: BamA, BamB, BamC, BamD and BamE. Once assembled, - β-barrel proteins can be involved in various functions including uptake of nutrients, export of toxins and mediating host-pathogen interactions, but the precise mechanism by which these ubiquitous and often essential β-barrel proteins are assembled is yet to be established. In order to determine the relative positions of BAM subunits in the membrane environment we reconstituted each subunit into a biomimetic membrane, characterizing their interaction and structural changes by Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) and neutron reflectometry. Our results suggested that the binding of BamE, or a BamDE dimer, to BamA induced conformational changes in the polypeptide transported-associated (POTRA) domains of BamA, but that BamB or BamD alone did not promote any such changes. As monitored by neutron reflectometry, addition of an unfolded substrate protein extended the length of POTRA domains further away from the membrane interface as part of the mechanism whereby the substrate protein was folded into the membrane.
Collapse
Affiliation(s)
- Xiaoyu Chen
- Department of Materials Science & Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Yue Ding
- Department of Materials Science & Engineering, Monash University, Clayton, VIC 3800, Australia; Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
| | - Rebecca S Bamert
- Infection & Immunity Program, Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia
| | - Anton P Le Brun
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Road, Lucas Heights, NSW 2234, Australia
| | - Anthony P Duff
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Road, Lucas Heights, NSW 2234, Australia
| | - Chun-Ming Wu
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Road, Lucas Heights, NSW 2234, Australia; National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Hsien-Yi Hsu
- School of Energy and Environment & Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, PR China; Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, PR China
| | - Takuya Shiota
- Institute for Tenure Track Promotion, Organization for Promotion of Career Management, University of Miyazaki, Miyazaki, Japan
| | - Trevor Lithgow
- Infection & Immunity Program, Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia.
| | - Hsin-Hui Shen
- Department of Materials Science & Engineering, Monash University, Clayton, VIC 3800, Australia; Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia.
| |
Collapse
|
16
|
Lai X, Ding Y, Wu CM, Chen X, Jiang JH, Hsu HY, Wang Y, Le Brun AP, Song J, Han ML, Li J, Shen HH. Phytantriol-Based Cubosome Formulation as an Antimicrobial against Lipopolysaccharide-Deficient Gram-Negative Bacteria. ACS Appl Mater Interfaces 2020; 12:44485-44498. [PMID: 32942850 DOI: 10.1021/acsami.0c13309] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Treatment of multidrug-resistant (MDR) bacterial infections increasingly relies on last-line antibiotics, such as polymyxins, with the urgent need for discovery of new antimicrobials. Nanotechnology-based antimicrobials have gained significant importance to prevent the catastrophic emergence of MDR over the past decade. In this study, phytantriol-based nanoparticles, named cubosomes, were prepared and examined in vitro by minimum inhibitory concentration (MIC) and time-kill assays against Gram-negative bacteria: Acinetobacter baumannii, Klebsiella pneumoniae, and Pseudomonas aeruginosa. Phytantriol-based cubosomes were highly bactericidal against polymyxin-resistant, lipopolysaccharide (LPS)-deficient A. baumannii strains. Small-angle neutron scattering (SANS) was employed to understand the structural changes in biomimetic membranes that replicate the composition of these LPS-deficient strains upon treatment with cubosomes. Additionally, to further understand the membrane-cubosome interface, neutron reflectivity (NR) was used to investigate the interaction of cubosomes with model bacterial membranes on a solid support. These results reveal that cubosomes might be a new strategy for combating LPS-deficient Gram-negative pathogens.
Collapse
Affiliation(s)
- Xiangfeng Lai
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Yue Ding
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, Victoria 3800, Australia
- Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Chun-Ming Wu
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Xiaoyu Chen
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Jhih-Hang Jiang
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Hsien-Yi Hsu
- School of Energy and Environment & Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China
- Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
| | - Yajun Wang
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325027, Zhejiang, China
| | - Anton P Le Brun
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
| | - Jiangning Song
- Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Mei-Ling Han
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Jian Li
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Hsin-Hui Shen
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, Victoria 3800, Australia
- Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| |
Collapse
|
17
|
Gandhi AC, Li TY, Kumar BV, Reddy PM, Peng JC, Wu CM, Wu SY. Room Temperature Magnetic Memory Effect in Cluster-Glassy Fe-doped NiO Nanoparticles. Nanomaterials (Basel) 2020; 10:nano10071318. [PMID: 32635511 PMCID: PMC7407623 DOI: 10.3390/nano10071318] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/02/2020] [Accepted: 07/02/2020] [Indexed: 11/16/2022]
Abstract
The Fe-doped NiO nanoparticles that were synthesized using a co-precipitation method are characterized by enhanced room-temperature ferromagnetic property evident from magnetic measurements. Neutron powder diffraction experiments suggested an increment of the magnetic moment of 3d ions in the nanoparticles as a function of Fe-concentration. The temperature, time, and field-dependent magnetization measurements show that the effect of Fe-doping in NiO has enhanced the intraparticle interactions due to formed defect clusters. The intraparticle interactions are proposed to bring additional magnetic anisotropy energy barriers that affect the overall magnetic moment relaxation process and emerging as room temperature magnetic memory. The outcome of this study is attractive for the future development of the room temperature ferromagnetic oxide system to facilitate the integration of spintronic devices and understanding of their fundamental physics.
Collapse
Affiliation(s)
| | - Tai-Yue Li
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan; (A.C.G.); (T.-Y.L.)
| | - B. Vijaya Kumar
- Department of Chemistry, Nizam College, Osmania University, Hyderabad 500001, India;
| | - P. Muralidhar Reddy
- Department of Chemistry, University College of Science, Osmania University, Hyderabad 500007, Telangana, India;
| | - Jen-Chih Peng
- SIKA, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan; (J.-C.P.); (C.-M.W.)
| | - Chun-Ming Wu
- SIKA, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan; (J.-C.P.); (C.-M.W.)
| | - Sheng Yun Wu
- Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan; (A.C.G.); (T.-Y.L.)
- Correspondence: ; Tel.: +886-3-890-3717
| |
Collapse
|
18
|
Batsaikhan E, Lee CH, Hsu H, Wu CM, Peng JC, Ma MH, Deleg S, Li WH. Largely Enhanced Ferromagnetism in Bare CuO Nanoparticles by a Small Size Effect. ACS Omega 2020; 5:3849-3856. [PMID: 32149211 PMCID: PMC7057320 DOI: 10.1021/acsomega.9b02913] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 01/23/2020] [Indexed: 05/27/2023]
Abstract
Magnetic properties of fully oxygenated bare CuO nanoparticles have been investigated using magnetization, X-ray diffraction, neutron diffraction, and Raman scattering measurements. The Langevin field profile is clearly revealed in the isothermal magnetization of 8.8 nm CuO nanoparticle assembly even at 300 K, revealing a 172 times enhancement of the ferromagnetic responses over that of bulk CuO. Surface magnetization of 8.8 nm CuO reaches 18% of the core magnetization. The Cu spins in 8.8 nm CuO order below 400 K, which is 1.7 times higher than the 231 K observed in bulk CuO. A relatively simple magnetic structure that may be indexed using a modulation vector of (0.2, 0, 0.2) was found for the 8.8 nm CuO, but no magnetic incommensurability was observed in bulk CuO. The Cu spins in 8.8 nm CuO form spin density waves with length scales of 5 chemical unit cells long along the crystallographic a- and c-axis directions. Considerable amounts of electronic charge shift from around the Cu lattice sites toward the interconnecting regions of two neighboring Cu-Cu ions, resulting in a stronger ferromagnetic direct exchange interaction for the neighboring Cu spins in 8.8 nm CuO.
Collapse
Affiliation(s)
- Erdembayalag Batsaikhan
- Department
of Physics, National Central University, Jhongli 32001, Taiwan
- Institute
of Physics and Technology, Mongolian Academy
of Sciences, Ulaanbaatar 13330, Mongolia
| | - Chi-Hung Lee
- Department
of Physics, National Central University, Jhongli 32001, Taiwan
| | - Han Hsu
- Department
of Physics, National Central University, Jhongli 32001, Taiwan
| | - Chun-Ming Wu
- National
Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Jen-Chih Peng
- National
Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Ma-Hsuan Ma
- Department
of Physics, National Central University, Jhongli 32001, Taiwan
| | - Sangaa Deleg
- Institute
of Physics and Technology, Mongolian Academy
of Sciences, Ulaanbaatar 13330, Mongolia
| | - Wen-Hsien Li
- Department
of Physics, National Central University, Jhongli 32001, Taiwan
| |
Collapse
|
19
|
Yang WC, Wu SH, Chen YF, Nelson A, Wu CM, Sun YS. Effects of the Density of Chemical Cross-links and Physical Entanglements of Ultraviolet-Irradiated Polystyrene Chains on Domain Orientation and Spatial Order of Polystyrene- block-Poly(methyl methacrylate) Nano-Domains. Langmuir 2019; 35:14017-14030. [PMID: 31577149 DOI: 10.1021/acs.langmuir.9b02054] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ultraviolet irradiation (UVI) of varied duration caused cross-linking and neutralization of polystyrene (PS) homopolymers of molar mass (Mn) from 6 to 290 kg mol-1 on a silicon-oxide surface. An optimal neutral skin layer on the surface of the PS was obtained via brief UVI in air (UVIA), by which the PS had no preferential interaction with either block in the copolymer. UVI in an inert environment (gaseous dinitrogen) (UVIN) stabilized the PS layers via cross-linking and enabled the PS networks to have an effective adhesive contact with the underlying substrate. Thorough examination of domain orientations and spatial orders of a series of block copolymer, polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA), thin films deposited on these UVI-treated PS support layers yielded clear evidence that a dense layer of neutralized PS chains was required for the perpendicular orientation of PS-b-PMMA nanodomains. In particular, in addition to neutralization, two factors-the densities of physical entanglements and of chemical crosslinks-both in UVI-treated PS should be considered for the perpendicular orientation of nanolamellae and nanocylinders in symmetric and asymmetric PS-b-PMMA thin films. The density of physical entanglement in PS depends intrinsically on Mn of the PS, whereas the density of chemical cross-links was controlled with a varied duration of UVIN. Sufficiently large densities of physical entanglements and chemical cross-links can prevent PS-b-PMMA chains from penetrating through the neutral skin layer. The total density of physical entanglements and chemical cross-links required for the perpendicular orientation is correlated with the dimensions of the PS-b-PMMA chains.
Collapse
Affiliation(s)
- Wei-Chen Yang
- Department of Chemical and Materials Engineering , National Central University , No. 300, Zhongda Rd. , Zhongli District, Taoyuan City 32001 , Taiwan
| | - Song-Hao Wu
- Department of Chemical and Materials Engineering , National Central University , No. 300, Zhongda Rd. , Zhongli District, Taoyuan City 32001 , Taiwan
| | - Yi-Fang Chen
- Department of Chemical and Materials Engineering , National Central University , No. 300, Zhongda Rd. , Zhongli District, Taoyuan City 32001 , Taiwan
| | - Andrew Nelson
- Australian Nuclear Science and Technology Organisation , Locked Bag 2001 , Kirrawee DC , New South Wales 2232 , Australia
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center , 101 Hsin-Ann Road, Hsinchu Science Park , Hsinchu 30076 , Taiwan
| | - Ya-Sen Sun
- Department of Chemical and Materials Engineering , National Central University , No. 300, Zhongda Rd. , Zhongli District, Taoyuan City 32001 , Taiwan
| |
Collapse
|
20
|
Mdlovu NV, Chen Y, Lin KS, Hsu MW, Wang SSS, Wu CM, Lin YS, Ohishi K. Multifunctional nanocarrier as a potential micro-RNA delivery vehicle for neuroblastoma treatment. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.10.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
21
|
Mdlovu NV, Mavuso FA, Lin KS, Chang TW, Chen Y, Wang SSS, Wu CM, Mdlovu NB, Lin YS. Iron oxide-pluronic F127 polymer nanocomposites as carriers for a doxorubicin drug delivery system. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.11.052] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
22
|
Huang PC, Mata JP, Wu CM, Lo CT. Morphology-Mediated Photoresponsive and Fluorescence Behaviors of Azobenzene-Containing Block Copolymers. Langmuir 2018; 34:7416-7427. [PMID: 29863876 DOI: 10.1021/acs.langmuir.8b01033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigated the relationship between the self-assembled morphology of poly( tert-butyl acrylate)- block-poly(6-[4-(4'-methoxyphenylazo)phenoxy]hexyl methacrylate) (P tBA- b-PAzoMA) block copolymers and their photoresponsive and fluorescence behaviors. The morphology of P tBA- b-PAzoMA copolymers was manipulated by dissolving them in mixed dimethylformamide (DMF)/hexanol solvents. When P tBA- b-PAzoMA was dissolved in DMF-rich (neutral) solvents, a favorable interaction between the DMF molecules and both blocks resulted in a random-coiled conformation. The unconfined morphology facilitated the formation of both nonassociated and head-to-head organized azobenzene mesogens, which promoted fluorescence emission. When hexanol, a P tBA-selective solvent, was added to DMF, the solvency of P tBA- b-PAzoMA worsened, leading to its assembly into micelles, with PAzoMA in the micelle core. The confinement of azobenzene moieties in the micelle core hindered their trans-to- cis photoisomerization, thereby considerably decreasing the kinetics of photoisomerization and the population of cis isomers. Additionally, a nanoconfined geometry resulted in compactly packed chromophores, causing fluorescence loss. When P tBA- b-PAzoMA was exposed to UV light, the increased number of cis isomers hampered the closely packed mesogens, resulting in a substantial enhancement of fluorescence emission. When the mole fraction of the PAzoMA block was increased, P tBA- b-PAzoMA formed clusters, causing the slow kinetics of photoisomerization and fluorescence quenching.
Collapse
Affiliation(s)
- Pin-Chi Huang
- Department of Chemical Engineering , National Cheng Kung University , Tainan City 701 , Taiwan
| | - Jitendra P Mata
- Australian Centre for Neutron Scattering , Australian Nuclear Science and Technology Organization , Lucas Heights , New South Wales 2234 , Australia
| | - Chun-Ming Wu
- National Synchrotron Radiation Research Center , 101 Hsin-Ann Road, Hsinchu Science Park , Hsinchu 30076 , Taiwan
| | - Chieh-Tsung Lo
- Department of Chemical Engineering , National Cheng Kung University , Tainan City 701 , Taiwan
| |
Collapse
|
23
|
Wu CM, Shen JZ. [Antimicrobial resistance of animal-borne bacteria: progresses, challenges and strategies]. Zhonghua Yu Fang Yi Xue Za Zhi 2018; 52:340-343. [PMID: 29614597 DOI: 10.3760/cma.j.issn.0253-9624.2018.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- C M Wu
- College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | | |
Collapse
|
24
|
Wood K, Mata JP, Garvey CJ, Wu CM, Hamilton WA, Abbeywick P, Bartlett D, Bartsch F, Baxter P, Booth N, Brown W, Christoforidis J, Clowes D, d'Adam T, Darmann F, Deura M, Harrison S, Hauser N, Horton G, Federici D, Franceschini F, Hanson P, Imamovic E, Imperia P, Jones M, Kennedy S, Kim S, Lam T, Lee WT, Lesha M, Mannicke D, Noakes T, Olsen SR, Osborn JC, Penny D, Perry M, Pullen SA, Robinson RA, Schulz JC, Xiong N, Gilbert EP. QUOKKA, the pinhole small-angle neutron scattering instrument at the OPAL Research Reactor, Australia: design, performance, operation and scientific highlights. J Appl Crystallogr 2018. [DOI: 10.1107/s1600576718002534] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
QUOKKA is a 40 m pinhole small-angle neutron scattering instrument in routine user operation at the OPAL research reactor at the Australian Nuclear Science and Technology Organisation. Operating with a neutron velocity selector enabling variable wavelength, QUOKKA has an adjustable collimation system providing source–sample distances of up to 20 m. Following the large-area sample position, a two-dimensional 1 m2position-sensitive detector measures neutrons scattered from the sample over a secondary flight path of up to 20 m. Also offering incident beam polarization and analysis capability as well as lens focusing optics, QUOKKA has been designed as a general purpose SANS instrument to conduct research across a broad range of scientific disciplines, from structural biology to magnetism. As it has recently generated its first 100 publications through serving the needs of the domestic and international user communities, it is timely to detail a description of its as-built design, performance and operation as well as its scientific highlights. Scientific examples presented here reflect the Australian context, as do the industrial applications, many combined with innovative and unique sample environments.
Collapse
|
25
|
Zhang L, Li YR, Zhou LQ, Wu CM. Comparison study on the calculation formula of evaporation mass flux through the plane vapour-liquid interface. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1742-6596/925/1/012019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
26
|
Lee CH, Wang MY, Batsaikhan E, Wu CM, Wang CW, Li WH. Photoenhanced Ferromagnetism in High-K +-Containing K-Ni-Cr Prussian Blue Analogues Coated on Rb-Co-Fe Nanocubes. ACS Omega 2017; 2:4227-4236. [PMID: 31457717 PMCID: PMC6641770 DOI: 10.1021/acsomega.7b00565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Accepted: 07/21/2017] [Indexed: 06/10/2023]
Abstract
A large enhancement of the Ni and Cr ferromagnetic moments under UV-light irradiation has been detected in 55 nm thick K0.98Ni[Cr(CN)6]0.70[(H2O)6]0.30·0.11H2O Prussian blue analogues coated on 240 nm Rb0.76Co[Fe(CN)6]0.74[(H2O)6]0.26·0.56H2O nanocubes. Two separate magnetic transitions were found. The one at 72 K marks the magnetic ordering of the Ni and Cr ions on the shell. A higher degree of electronic connection along the Ni-N-C-Cr-C-N-Ni chains was achieved by the incorporation of a larger amount of K+ ions into the voids enclosed by the NiN6 and CrC6 octahedra, which was used to understand the appearance of photoenhanced ferromagnetism in the K-Ni-Cr network. A weak moment developed in the core below 10 K, corresponding to separate ordering of the Co and Fe ions in the Rb-Co-Fe network. Photoinduced ferromagnetism of the Co and Fe ions in the Rb-Co-Fe was also detected.
Collapse
Affiliation(s)
- Chi-Hung Lee
- Department
of Physics, National Central University, Jhongli, Taoyuan 32001, Taiwan
| | - Min-Yung Wang
- Department
of Physics, National Central University, Jhongli, Taoyuan 32001, Taiwan
| | | | - Chun-Ming Wu
- Neutron
Group, National Synchrotron Radiation Research
Center, Hsinchu 30076, Taiwan
| | - Chin-Wei Wang
- Neutron
Group, National Synchrotron Radiation Research
Center, Hsinchu 30076, Taiwan
| | - Wen-Hsien Li
- Department
of Physics, National Central University, Jhongli, Taoyuan 32001, Taiwan
| |
Collapse
|
27
|
Wu CC, Hsu CJ, Huang FL, Lin YH, Lin YH, Liu TC, Wu CM. Timing of cochlear implantation in auditory neuropathy patients with OTOF mutations: Our experience with 10 patients. Clin Otolaryngol 2017; 43:352-357. [PMID: 28766844 DOI: 10.1111/coa.12949] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2017] [Indexed: 11/27/2022]
Affiliation(s)
- C C Wu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - C J Hsu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - F L Huang
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - Y H Lin
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Graduate Institute of Molecular Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Y H Lin
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
| | - T C Liu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - C M Wu
- Department of Otolaryngology, Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan
| |
Collapse
|
28
|
Lin ST, Lin CS, Chang YY, Whitten AE, Sokolova A, Wu CM, Ivanov VA, Khokhlov AR, Tung SH. Effects of Alkali Cations and Halide Anions on the Self-Assembly of Phosphatidylcholine in Oils. Langmuir 2016; 32:12166-12174. [PMID: 27802053 DOI: 10.1021/acs.langmuir.6b03449] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The interactions between ions and phospholipids are closely associated with the structures and functions of cell membrane. Instead of conventional aqueous systems, we systematically investigated the effects of inorganic ions on the self-assembly of lecithin, a zwitterionic phosphatidylcholine, in cyclohexane. Previous studies have shown that addition of inorganic salts with specific divalent and trivalent cations can transform lecithin organosols into organogels. In this study, we focused on the effect of monovalent alkali halides. Fourier transform infrared spectroscopy was used to demonstrate that the binding strength of the alkali cations with the phosphate of lecithin is in the order Li+ > Na+ > K+. More importantly, the cation-phosphate interaction is affected by the paired halide anions, and the effect follows the series I- > Br- > Cl-. The salts of stronger interactions with lecithin, including LiCl, LiBr, LiI, and NaI, were found to induce cylindrical micelles sufficiently long to form organogels, while others remain organosols. A mechanism based on the charge density of ions and the enthalpy change of the ion exchange between alkali halides and lecithin headgroup is provided to explain the contrasting interactions and the effectiveness of the salts to induce organogelation.
Collapse
Affiliation(s)
- Shih-Ting Lin
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| | - Chen-Shin Lin
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| | - Ya-Ying Chang
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| | - Andrew E Whitten
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
| | - Anna Sokolova
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
| | - Chun-Ming Wu
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Viktor A Ivanov
- Faculty of Physics, Moscow State University , Moscow 119991, Russia
| | | | - Shih-Huang Tung
- Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan
| |
Collapse
|
29
|
Xu RX, Liu RY, Wu CM, Zhao YS, Li Y, Yao YQ, Xu YH. DNA damage-induced NF-κB activation in human glioblastoma cells promotes miR-181b expression and cell proliferation. Cell Physiol Biochem 2015; 35:913-25. [PMID: 25633526 DOI: 10.1159/000369748] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Glioblastoma (GBM) is the most common and most aggressive form of brain cancer. After surgery, radiotherapy is the mainstay of treatment for GBM patients. Unfortunately, the vast majority of GBM patients fail responding to radiotherapy because GBM cells remain highly resistant to radiation. Radiotherapy-induced DNA damage response may correlate with therapeutic resistance. METHODS Ionizing radiation (IR) was used to induce DNA damage. Cell proliferation and migration were detected by wound-healing, MTT and apoptosis assays. Dual-luciferase assays and Western blot analysis were performed to evaluate NF-κB activation and validate microRNA targets. Real-time PCR was used to study mRNA and microRNA levels. RESULTS IR-induced DNA damage activated NF-κB in GBM cells which promoted expression of IL-6, IL-8 and Bcl-xL, thereby contributing to cell survival and invasion. Knockdown SENP2 expression enhanced NF-κB essential modulator (NEMO) SUMOylation and NF-κB activity following IR exposure. miR-181b targets SENP2 and positively regulated NF-κB activity. CONCLUSION NF-κB activation by DNA damage in GBM cells confers resistance to radiation-induced death.
Collapse
Affiliation(s)
- Rui-Xue Xu
- Department of Neurosurgery, the First Affiliated Hospital of Dalian Medical University, Dalian, China
| | | | | | | | | | | | | |
Collapse
|
30
|
|
31
|
Wu CM, Chen WJ, Zheng Y, Ma DC, Wang B, Liu JY, Woo CH. Controllability of vortex domain structure in ferroelectric nanodot: fruitful domain patterns and transformation paths. Sci Rep 2014; 4:3946. [PMID: 24492764 PMCID: PMC3912473 DOI: 10.1038/srep03946] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 01/15/2014] [Indexed: 11/09/2022] Open
Abstract
Ferroelectric vortex domain structure which exists in low-dimensional ferroelectrics is being intensively researched for future applications in functional nanodevices. Here we demonstrate that adjusting surface charge screening in combination with temperature can provide an efficient way to gain control of vortex domain structure in ferroelectric nanodot. Systematical simulating experiments have been conducted to reveal the stability and evolution mechanisms of domain structure in ferroelectric nanodot under various conditions, including processes of cooling-down/heating-up under different surface charge screening conditions, and increasing/decreasing surface charge screening at different temperatures. Fruitful phase diagrams as functions of surface screening and temperature are presented, together with evolution paths of various domain patterns. Calculations discover up to 25 different kinds of domain patterns and 22 typical evolution paths of phase transitions. The fruitful controllability of vortex domain structure by surface charge screening in combination with temperature should shed light on prospective nanodevice applications of low-dimensional ferroelectric nanostructures.
Collapse
Affiliation(s)
- C M Wu
- State Key Laboratory of Optoelectronic Materials and Technologies, Micro&Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - W J Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Micro&Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Yue Zheng
- 1] State Key Laboratory of Optoelectronic Materials and Technologies, Micro&Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China [2] Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China
| | - D C Ma
- Sino-French Institute of Nuclear Engineering and Technology, Zhuhai Campus, Sun Yat-sen University, Zhuhai 519082, China
| | - B Wang
- State Key Laboratory of Optoelectronic Materials and Technologies, Micro&Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - J Y Liu
- State Key Laboratory of Optoelectronic Materials and Technologies, Micro&Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - C H Woo
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China
| |
Collapse
|
32
|
Bi N, Xu RX, Liu RY, Wu CM, Wang J, Chen WD, Liu J, Xu YS, Wei ZQ, Li T, Zhang J, Bai JY, Dong B, Fan SJ, Xu YH. Microsurgical treatment for parasagittal meningioma in the central gyrus region. Oncol Lett 2013; 6:781-784. [PMID: 24137410 PMCID: PMC3789089 DOI: 10.3892/ol.2013.1429] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Accepted: 05/14/2013] [Indexed: 11/25/2022] Open
Abstract
The aim of the present study was to determine the efficacy of microsurgery treatment for parasagittal meningioma in the central gyrus region. A microsurgical technique was used to treat 26 patients with large parasagittal meningioma in the central gyrus region. The Rolandic and draining veins and the peritumoral normal brain tissue were retained, and the associated sagittal sinus was appropriately protected. A Simpson grade I, II or III resection was performed in 8 (30.8%), 12 (46.2%) and 6 (23.1%) patients, respectively, with no post-operative mortalities. Following treatment, 9 patients exhibited hemiparalysis. No tumor recurrence was found in 21 patients during the follow-up examination. The treatment protocol described in the current study included sufficient pre-operative imaging evaluations, a skilled microsurgical technique, improved protection of the Rolandic vein and treatment of the sagittal sinus, and was found to significantly increase the total tumor removal rate and decrease post-operative recurrence.
Collapse
Affiliation(s)
- Na Bi
- Department of Nursing, Chinese PLA General Hospital, Beijing 100853, P.R. China ; Department of Neurosurgery, The 309th Hospital of PLA, Beijing 100091, P.R. China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Chung MH, Kuo EY, Wu CM, Chen KT, Lin HJ. Cerebral “eThrombosis”: Cerebral Venous Sinus Thrombosis Associated with Prolonged Sitting in Front of a Computer. HONG KONG J EMERG ME 2013. [DOI: 10.1177/102490791302000207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Venous thromboembolism caused by prolonged sitting during air travel has been recognised as economy-class syndrome for more than 30 years. Since 2003, the term “eThrombosis” has been proposed to describe the 21st Century variant of venous thromboembolism associated with immobilisation. We reported a case of cerebral venous sinus thrombosis presenting with severe headache after a prolonged period of sitting for over 12 hours in front of a computer for recreational purpose. We described this case as cerebral “eThrombosis”. Considering the widespread use of computers for many purposes including working, recreation and communications in the present digital era, we would like to put forward that prolonged immobilisation associated with computer use is a possible provoking risk factor of cerebral venous sinus thrombosis.
Collapse
Affiliation(s)
| | | | | | - KT Chen
- Taipei Medical University, Department of Emergency Medicine, Taipei, Taiwan
| | - HJ Lin
- Southern Tainan University of Technology, Department of Biotechnology, Tainan, Taiwan
| |
Collapse
|
34
|
Karna SK, Hung CH, Wu CM, Wang CW, Li WH, Sankar R, Chou FC, Avdeev M. Large magnetoresistance and charge transfer between the conduction and magnetic electrons in layered oxyselenide BiOCu0.96Se. Dalton Trans 2013; 42:15581-90. [DOI: 10.1039/c3dt52245h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
35
|
Karna SK, Wang CW, Wu CM, Hsu CK, Hsu D, Wang CJ, Li WH, Sankar R, Chou FC. Spin, charge and lattice couplings in Cu-deficient oxysulphide BiOCu0.94S. J Phys Condens Matter 2012; 24:266004. [PMID: 22677954 DOI: 10.1088/0953-8984/24/26/266004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The electrical and magnetic properties of slightly Cu-deficient BiOCu(0.94)S are investigated using neutron diffraction, ac magnetic susceptibility, magnetization and electrical resistivity measurements. The Cu spins order in a ferromagnetic arrangement below T(C) = 250 K. An antiferromagnetic component develops below 180 K when the crystalline unit cell experiences a sharp thermal contraction upon cooling, resulting in a canted ferromagnetic spin arrangement at low temperatures. In the magnetically ordered state the electrical transport can be described using three-dimensional variable range hopping conduction. An applied magnetic field can effectively reduce the hopping barrier. Spin-charge couplings are clearly revealed when the resistivity departs from the hopping conduction and begins to increase with increasing temperatures above 250 K where the Cu spins become disordered.
Collapse
Affiliation(s)
- Sunil K Karna
- Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Ho IT, Lai TL, Wu RT, Tsai MT, Wu CM, Lee GH, Chung WS. Design and synthesis of triazolyl coumarins as Hg2+ selective fluorescent chemosensors. Analyst 2012; 137:5770-6. [DOI: 10.1039/c2an36076d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
37
|
Zhao YS, Zhu TZ, Chen YW, Yao YQ, Wu CM, Wei ZQ, Wang W, Xu YH. Β-elemene inhibits Hsp90/Raf-1 molecular complex inducing apoptosis of glioblastoma cells. J Neurooncol 2011; 107:307-14. [PMID: 22160627 DOI: 10.1007/s11060-011-0770-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Accepted: 11/16/2011] [Indexed: 01/28/2023]
Abstract
β-Elemene, an active component of herb medicine Curcuma wenyujin, has been shown to antagonize glioblastoma cells by inducing apoptosis. However, how β-elemene induces apoptosis of these cells remains unclear. In this study, we report that β-elemene disrupted the formation of the Hsp90/Raf-1 complex, a key step in maintaining the conformation stability of Raf-1, and caused deactivation of Raf-1 and inhibition of the ERK pathway, thereby leading to apoptosis of glioblastoma cells. Specifically, treatment of glioblastoma cell lines with β-elemene attenuated phosphorylation of multiple members of the kinase families in the Ras/Raf/MEK/ERK cascade, including Raf-1 and ERK as well as downstream signaling targets such as Bcl-2. These results suggest that the Hsp90/Raf-1 complex could be a promising molecular target for new drug development for the treatment of glioblastoma.
Collapse
Affiliation(s)
- Yong-Shun Zhao
- Department of Neurosurgery, 1st Affiliated Hospital of Dalian Medical University, 222 Zhong Shan Road, Dalian 116011, People's Republic of China
| | | | | | | | | | | | | | | |
Collapse
|
38
|
Wu CM, Zhang HB, Zhou Q, Wan L, Jin J, Ni L, Pan YJ, Wu XY, Ruan LY. Two novel DAX1 gene mutations in Chinese patients with X-linked adrenal hypoplasia congenita: clinical, hormonal and genetic analysis. J Endocrinol Invest 2011; 34:e235-9. [PMID: 21270512 DOI: 10.3275/7484] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mutations in the DAX1 gene result in X-linked congenital adrenal hypoplasia (AHC). Affected boys usually present with primary adrenal failure in early infancy or childhood and hypogonadotropic hypogonadism (HH) at puberty. This paper describes the clinical, hormonal, radiological, and genetic characteristics of 2 Chinese patients with X-linked AHC. Primary adrenal insufficiency occurred in the 2 patients during their childhood and HH was recognized at puberty. Genomic DNA was extracted from their peripheral blood leukocytes and coding sequence abnormalities of the DAX1 gene were assessed by PCR and direct sequencing analysis. Genetic analysis of the DAX1 gene revealed 2 novel mutations c.572-575 dupGGGC, p.Thr193Gly,fs,205X and c.773- 774 dupCC, p.Ser259Pro,fs,264X in exon 1, causing frameshifts and yeilding premature stop codons at 205 and 264, respectively. This study identifies 2 novel mutations in the DAX1 gene which can further expand the mutation database and benefit patients in the diagnosis and treatment of AHC.
Collapse
Affiliation(s)
- C M Wu
- Department of Endocrinology, The Second Affiliated Hospital of Wenzhou Medical College, Wenzhou 325027, Zhejiang, China.
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Wang CW, Wu CM, Li CY, Karna SK, Hsu CK, Li CHC, Li WH, Yu CC, Wu CP, Chou H, Lynn JW. Short range magnetic correlations induced by La substitution in Ho(1-x)La(x)Mn(2)O(5). J Phys Condens Matter 2010; 22:246002. [PMID: 21393793 DOI: 10.1088/0953-8984/22/24/246002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetic susceptibility, x-ray diffraction, neutron diffraction and Raman scattering measurements are employed to study the effects of La substitution on the magnetic properties of multiferroic HoMn(2)O(5). 9% and 18% La-substituted compounds crystallize into the same orthorhombic Pbam symmetry as the parent compound. The magnetic responses to an ac driving magnetic field between 40 and 140 K are greatly enhanced by 18% La substitution. The neutron magnetic diffraction patterns reveal the development of short range magnetic correlations below 140 K. In addition, two Raman peaks and a series of new x-ray diffraction peaks suddenly develop below this temperature. Incommensurate long range antiferromagnetic order appears below 38 K. Magnetic frustration could be the main mechanism governing the present observations.
Collapse
Affiliation(s)
- Chin-Wei Wang
- Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli, 32001, Taiwan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Yang CC, Li WH, Wu CM, Li CHC, Sun J, Lynn JW. Interplay between the Crystalline and Magnetic Structures in Lightly Cr-Doped Bi0.37Ca0.63Mn0.96Cr0.04O2.99. Inorg Chem 2010; 49:3297-304. [DOI: 10.1021/ic9022823] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
41
|
Huang SL, Hsu YC, Wu CM, Lynn JW, Li WH. Thermal Effects on the Activity and Structural Conformation of Catechol 2,3-Dioxygenase from Pseudomonas putida SH1. J Phys Chem B 2009; 114:987-92. [DOI: 10.1021/jp9078579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shir-Ly Huang
- Department of Life Sciences and Center for Biotechnology & Biomedical Engineering, National Central University, Jhongli 32001, Taiwan, Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan, and NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899
| | - Yuan-Chang Hsu
- Department of Life Sciences and Center for Biotechnology & Biomedical Engineering, National Central University, Jhongli 32001, Taiwan, Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan, and NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899
| | - Chun-Ming Wu
- Department of Life Sciences and Center for Biotechnology & Biomedical Engineering, National Central University, Jhongli 32001, Taiwan, Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan, and NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899
| | - Jeffrey W. Lynn
- Department of Life Sciences and Center for Biotechnology & Biomedical Engineering, National Central University, Jhongli 32001, Taiwan, Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan, and NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899
| | - Wen-Hsien Li
- Department of Life Sciences and Center for Biotechnology & Biomedical Engineering, National Central University, Jhongli 32001, Taiwan, Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan, and NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899
| |
Collapse
|
42
|
Liu LB, Wu CM, Wen J, Chen JL, Zheng MQ, Zhao GP. Association of SNPs in exon 2 of the MHC B-F gene with immune traits in two distinct chicken populations: Chinese Beijing-You and White Leghorn. ACTA AGR SCAND A-AN 2009; 59:4-11. [PMID: 27453634 PMCID: PMC4936439 DOI: 10.1080/09064700902988905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 04/06/2009] [Accepted: 04/22/2009] [Indexed: 11/09/2022]
Abstract
Antibody titers raised for vaccinations against avian influenza (AI) and Newcastle disease (ND) were higher in Chinese Beijing-You (BJY) than in White Leghorn (WL) (P < 0.001), but there was no breed difference in titers for sheep red blood cells (SRBC). Genotyping by PCR-SSCP identified seven haplotypes in WL and 17 in BJY. After sequencing PCR products (35 and 85, respectively), 43 (WL) and 47 (BJY) single nucleotide polymorphisms (SNPs) were found in the 264 bp of exon 2. In WL chickens, significant associations were found with antibody responses to AI (two SNPs), ND (six SNPs), and SRBC (one SNP), while in BJY there was association with responses to ND (two SNPs) and SRBC (two SNPs), but none with AI. These results indicate that the genomic region bearing exon 2 of the major histocompatibility complex B-F gene has significant effects on antibody responses to SRBC and vaccination against AI and ND. Different SNPs affected antibody titers for each of the antigens and they differed between these very distinct breeds.
Collapse
Affiliation(s)
- L B Liu
- Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100094, China
| | - C M Wu
- Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100094, China
| | - J Wen
- Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100094, China
| | - J L Chen
- Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100094, China
| | - M Q Zheng
- Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100094, China
| | - G P Zhao
- Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing 100094, China
| |
Collapse
|
43
|
Abstract
The title compound, C(8)H(8)BrNO(2), does not show any significant inter-molecular π-π or C-H⋯π inter-actions in the crystal packing except for one weak Br⋯Br [3.715 (1) Å] inter-action.
Collapse
|
44
|
Wu CM, Cao JL, Zheng MH, Ou Y, Zhang L, Zhu XQ, Song JX. Effect and mechanism of andrographolide on the recovery of Pseudomonas aeruginosa susceptibility to several antibiotics. J Int Med Res 2008; 36:178-86. [PMID: 18304418 DOI: 10.1177/147323000803600123] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Effectiveness and mechanism of action of andrographolide on the recovery of Pseudomonas aeruginosa susceptibility to antibiotics was investigated. In the presence of andrographolide, the Mueller-Hinton broth dilution method measured minimal inhibitory concentrations (MIC) of ceftazidine, cefpirome, chloramphenicol, L-ofloxacin, kanamycin, imipenem and meropenem. Real-time fluorescence quantitative polymerase chain reaction was used to determine mexB mRNA expressions in P. aeruginosa PAO1 strain and MexAB-OprM overexpressing strain. Relative mexB mRNA expression was detected in both strains incubated for 3 and 9 h. When andrographolide-treated groups were compared with controls, the MIC of ceftazidine, cefpirome, L-ofloxacin and meropenem for both strains decreased, and the relative mexB mRNA expression was significantly lower, although between andrographolide groups there were no significant differences. Compared with the inactivated quorum-sensing system, relative amounts of mexB mRNA in the PAO1 strain and MexAB-OprM overexpressing strain in the activated quorum-sensing system increased 10- and 30-fold, respectively. Andrographolide recovered P. aeruginosa susceptibility to antibiotics and reduced the MexAB-OprM efflux pump expression level.
Collapse
Affiliation(s)
- C M Wu
- Department of Liver Diseases, The Traditional Chinese Medical Hospital of Wenzhou, Wenzhou, China
| | | | | | | | | | | | | |
Collapse
|
45
|
Qin HM, Wu CM, Li HT, Song JX. Role of andrographolide in the permeability of intestinal tract of cirrhosis rats and its clinical significance. Shijie Huaren Xiaohua Zazhi 2008; 16:839-843. [DOI: 10.11569/wcjd.v16.i8.839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To detect the impact of andrographolide on the permeability of intestinal tract of cirrhosis rats by high performance liquid chromatography and to probe its clinical significance.
METHODS: The discharge rate of mannitol (M) and lactulose (L) in cirrhosis rats was detected by high performance liquid chromatography (HPLC) and compared with the standard curve.
RESULTS: The lactulose/mannitol (L/M) discharge rate in cirrhosis rats was significantly higher than that in normal rats (0.036 ± 0.012 vs 0.026 ± 0.009, P < 0.05) and significantly lower in the andrographolide and norfloxacin intervention group than that in the control group (0.022 ± 0.010, 0.022 ± 0.007 vs 0.036 ± 0.012, P < 0.05).
CONCLUSION: The permeability of intestinal tract of cirrhosis rats is significantly higher than that of normal rats and significantly lower in the andrographitis and norfloxacin intervention group than that in the control group.
Collapse
|
46
|
Wu CM, Wu CC, Su CC, Lee SN, Lee YA, Wu JY. Microbial synthesis of cis,cis-muconic acid from benzoate by Sphingobacterium sp. mutants. Biochem Eng J 2006. [DOI: 10.1016/j.bej.2005.02.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
47
|
Abstract
BACKGROUND Obstructive vascular lesions at the terminal portion of the internal carotid arteries are thought to be the primary and essential lesions in moyamoya disease. The etiology remains unknown. To detect possible mediators of the thickened intima of moyamoya disease, we measured serum alpha-1-antitrypsin (alpha1-AT) levels and characterized the phenotype of patients with familial moyamoya disease. PATIENTS AND METHODS Fifty-six individuals were examined, including 29 patients with moyamoya disease from 14 families. Serum alpha1-AT levels were analyzed by electroimmunoassay and genomic phenotype by isoelectric focusing. RESULTS All individuals had a normal alpha1-AT phenotype. The average serum alpha1-AT level in moyamoya disease patients was significantly higher than that of normal individuals, although both were within the normal range. CONCLUSIONS These findings suggest that serum alpha1-AT level may be a marker, rather than an etiologic factor, indicating the progression of moyamoya disease.
Collapse
Affiliation(s)
- Toshiyuki Amano
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, 812-8582 Higashi-ku, Fukuoka, Japan.
| | | | | | | | | |
Collapse
|
48
|
Amano T, Inamura T, Wu CM, Kura S, Nakamizo A, Inoha S, Miyazono M, Ikezaki K. Effects of single low dose irradiation on subventricular zone cells in juvenile rat brain. Neurol Res 2002; 24:809-16. [PMID: 12500705 DOI: 10.1179/016164102101200771] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Although the juvenile human brain is relatively radioresistant, irradiation can result in brain growth retardation, progressive mental disturbance, and neurologic abnormalities. As neural stem cells or progenitor cells may be a target of radiation injury and may play an important role in the brain's functional recovery, we examined the effects of whole brain irradiation on these cells in juvenile rat. Six-week-old Wistar rats, where the brain is still growing, were irradiated with single doses of 1, 2, or 3 Gy X-ray. We measured their body and brain weights at 30 or 60 days after irradiation. The chronological changes of the subventricular zone (SVZ) were examined at 6 h, 2, 7, 14, 30, or 60 days after irradiation by immunohistochemistry, specifically looking at the neural stem cells or progenitor cells using anti-nestin antibodies specific for these cells. The rate of brain weight gain of irradiated rats significantly decreased in comparison to controls, although that of body weight gain was similar among them. Multiple apoptotic cells appeared in the SVZ at 6 h after irradiation with simultaneous reduction in nestin-positive cells (69% of the control). The cell levels recovered within a week, with the nestin-positive cells reaching maximal numbers (182%) on Day 14. Nestin-positive cells returned to baseline levels within 30 days (96%) and remained unchanged for the subsequent 60 days. The X-ray dosage did not affect these findings. Our findings revealed that single low dose X-ray administration reversibly affected the levels of neural stem and progenitor cells in the SVZ region. These results suggest that continuous multiple administrations of X-rays in clinical treatment may affect irreversible changes on neural stem or progenitor cells, causing brain growth retardation, or dysfunction.
Collapse
Affiliation(s)
- Toshiyuki Amano
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Amano T, Inamura T, Nakamizo A, Inoha S, Wu CM, Ikezaki K. Case management of hydrocephalus associated with the progression of childhood brain stem gliomas. Childs Nerv Syst 2002; 18:599-604. [PMID: 12420118 DOI: 10.1007/s00381-002-0637-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2001] [Revised: 05/17/2002] [Indexed: 10/27/2022]
Abstract
OBJECT Most patients diagnosed with brain stem glioma become bedridden because of deteriorating brain stem function. Many brain stem glioma patients develop hydrocephalus. Both of these outcomes greatly detract from the quality of life of these patients. We have analyzed the occurrence of hydrocephalus in diffuse brain stem gliomas in children, and we discuss the management of advanced cases. METHODS Eighteen patients diagnosed with brain stem glioma while under 15 years of age, including 1 with dissemination, were studied retrospectively. The average overall survival was 11.8 +/- 6.5 months (mean +/- SD). Hydrocephalus occurred in 16 (88.9%) of the 18 cases. The patients diagnosed with hydrocephalus all exhibited a rapid decline in consciousness. The average time to onset of hydrocephalus after tumor diagnosis was 5.1 +/- 3.3 months. Twelve of the 16 patients with hydrocephalus were treated with cerebrospinal fluid (CSF) diversion, by means of a Torkildsen shunt, a ventriculoperitoneal shunt, or third ventriculostomy. The level of consciousness and patient performance status improved after CSF diversion except in 2 patients who had received Torkildsen shunts. The patients treated for hydrocephalus survived significantly longer than those patients who did not undergo any intervention for hydrocephalus. CSF diversion may be a therapeutic intervention that significantly improves the quality of life and survival of patients. CONCLUSION Our results suggest that patients diagnosed with brain stem glioma should be closely monitored for signs of hydrocephalus and be examined by neuroimaging rapidly when indicated. Our results also suggest that once hydrocephalus is diagnosed CSF diversion should be performed promptly.
Collapse
Affiliation(s)
- Toshiyuki Amano
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
| | | | | | | | | | | |
Collapse
|
50
|
Morioka T, Kawamura T, Fukui K, Wu CM, Nishio S. [Pathophysiology of medial temporal lobe epilepsy: role of cerebral dysgenesis]. No To Shinkei 2002; 54:313-9. [PMID: 11993159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
We studied the incidence of cerebral dysgenetic lesions(CD) in 39 operated patients with medial temporal lobe epilepsy(MTLE) who had hippocampal sclerosis. Four patients had CD, such as menigocele at the ipsilateral temporal fossa, schizencephaly in the ipsilateral peri-Rolandic area, focal cortical dysplasia in the ipsilateral inferior temporal gyrus and periventricular nodular heterotopia at the bilateral inferior horns of the lateral ventricle. Histological examinations of the resected lateral temporal lobes from 29 MTLE patients revealed the presence of microdysgenesis (microscopic cerebral dysgenesis) in 28 patients, including heterotopic white matter neuron(24 cases), molecular layer neuron(14), oligodendroglial cell cluster(11), dilated perivascular space(10). These findings suggest that the congenital factors, as well as hippocampal sclerosis, may be involved in the development of MTLE.
Collapse
Affiliation(s)
- Takato Morioka
- Laboratory of Dynamic Neuropathophysiology, Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | | | | | | | | |
Collapse
|