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Koo J, Yoon M, Chung W, Chung M, Kim D. SU-F-T-244: Radiotherapy Risk Estimation Based On Expert Group Survey. Med Phys 2016. [DOI: 10.1118/1.4956384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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77
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Moon S, Yoon M, Chung W, Chung M, Kim D. SU-F-T-17: A Feasibility Study for the Transit Dosimetry with a Glass Dosimeter in Brachytherapy. Med Phys 2016. [DOI: 10.1118/1.4956151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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78
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Kim D, Yoon M, Chung W, Chung M. SU-F-T-329: Characteristic Study of a Rado-Photoluminescenct Glass Dosimeter with Accumulated Dose. Med Phys 2016. [DOI: 10.1118/1.4956514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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79
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Moon S, Yoon M, Chung M, Chung W, Kim D. PO-0897: Comparison of hippocampus sparing extent according to the tilt of a patient head during WBRT. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32147-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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80
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Jeong S, Yoon M, Kim D, Chung W, Chung M. EP-1557: Development of dose calculation algorithm in homogeneous phantom through the transit dose. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32807-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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81
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Pillai R, McLennan G, Chung M, Warhadpande S, Kalra-Lall A. The makings of an ideal interventional radiology clinical clerkship: survey results of medical students and interventional radiology educators to improve medical student training in preparation for the IR/DR residency. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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82
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Arutunian SG, Chung M, Harutyunyan GS, Margaryan AV, Lazareva EG, Lazarev LM, Shahinyan LA. Fast resonant target vibrating wire scanner for photon beam. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:023108. [PMID: 26931835 DOI: 10.1063/1.4941837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We propose a new type of wire scanner for beam profile measurements, based on the use of a vibrating wire as a scattering target. Synchronous measurements with the wire oscillation allow to detect only the signal coming from the scattering of the beam on the wire. This resonant method enables fast beam profiling in the presence of a high level of background. The developed wire scanner, called resonant target vibrating wire scanner, is applied to photon beam profiling, in which the photons reflected on the wire are measured by a fast photodiode. In addition, the proposed measurement principle is expected to monitor other types of beams as well, such as neutrons, protons, electrons, and ions.
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Woeste G, Juratli MA, Habbe N, Hannes S, El Youzouri H, Bechstein WO, Trombetta F, Moscato R, Ciamporcero T, Ghiglione F, Morino M, Tahir S, Baldjiev T, Goshev G, Pachoov N, Eftimov E, Kovachevski S, Smirnoff A, Roth JS, Wennergren J, Plymale MA, Zachem A, Davenport DL, Mangiante G, Passeri V, deManzoni G, Kaufmann R, Jairam AP, Mulder IM, Wu Z, Verhelst J, Vennix S, Giessen LJX, Jeekel J, Lange JF, Di Cerbo F, Ikhlawi K, Baladov M, Agha A, Iesalnieks I, Franklin M, Hernandez M, Glass J, Glover M, Gruber-Blum S, Fortelny R, May C, Glaser K, Redl H, Petter-Puchner A, Grossi J, Cavazzola LT, Tezza SLT, Nery LA, Zortea J, Roll S, Gorganchian F, Santa Maria V, Zuvela M, Galun D, Petrovic J, Micev M, Palibrk I, Bidzic N, Colozzi S, Clementi M, Cianca G, Giuliani A, Carlei F, Schietroma M, Amicucci G, Chung M, Cerasani N, Meyer J, Bulian DR, Heiss MM, Kocaay AF, Eker T, Celik SU, Akyol C, Cakmak A. Topic: Abdominal Wall Hernia - Abdominal wall closure. Hernia 2015; 19 Suppl 1:S198-205. [PMID: 26518800 DOI: 10.1007/bf03355349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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84
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Ruiz-Jasbon F, Ticehurst K, Norrby J, Ahonen J, Ivarsson ML, Klimovska T, Mukans M, Niciporuka R, Ivanovs I, Pupelis G, El-Bakary T, Bouchiba N, El-Faki A, El-Akkad M, Dabic D, Maric B, Perunicic V, Chung M, Amerio G, Pozzo G, Sorisio V, Peng L, Huang K, Huang YJ, Yang YC, Hu SX, Zhao G. Topic: Inguinal Hernia - Crossfire between the meshes. Hernia 2015; 19 Suppl 1:S251-3. [PMID: 26518817 DOI: 10.1007/bf03355365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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85
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Chung J, Cho D, Chung D, Chung M. Serum Cystatin C Levels are Positively Associated with Cardiovascular Autonomic Neuropathy in Patients with Type 2 Diabetes. Exp Clin Endocrinol Diabetes 2015. [DOI: 10.1055/s-0035-1555774] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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86
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Jeong S, Kim D, Chung W, Yoon M, Shin D, Chung M. SU-E-T-801: Verification of Dose Information Passed Through 3D-Printed Products. Med Phys 2015. [DOI: 10.1118/1.4925165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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87
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Zhang C, Casas-Tintó S, Li G, Lin N, Chung M, Moreno E, Moberg KH, Zhou L. An intergenic regulatory region mediates Drosophila Myc-induced apoptosis and blocks tissue hyperplasia. Oncogene 2015; 34:2412. [PMID: 25924716 DOI: 10.1038/onc.2014.463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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88
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Campos J, Nayar S, Chung M, Hitchcock JR, Withers DR, Cunningham AF, Carlesso G, Herbst R, Buckley CD, Barone F. A2.20 ICOS-ICOSL interaction regulates lymphotoxin alpha expression and maturation of lymphoid-like stromal cells during inflammation. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-207259.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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89
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Groening L, Maier M, Xiao C, Dahl L, Gerhard P, Kester OK, Mickat S, Vormann H, Vossberg M, Chung M. Experimental proof of adjustable single-knob ion beam emittance partitioning. PHYSICAL REVIEW LETTERS 2014; 113:264802. [PMID: 25615345 DOI: 10.1103/physrevlett.113.264802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Indexed: 06/04/2023]
Abstract
The performance of accelerators profits from phase-space tailoring by coupling of degrees of freedom. Previously applied techniques swap the emittances among the three degrees but the set of available emittances is fixed. In contrast to these emittance exchange scenarios, the emittance transfer scenario presented here allows for arbitrarily changing the set of emittances as long as the product of the emittances is preserved. This Letter is the first experimental demonstration of transverse emittance transfer along an ion beam line. The amount of transfer is chosen by setting just one single magnetic field value. The envelope functions (beta) and slopes (alpha) of the finally uncorrelated and repartitioned beam at the exit of the transfer line do not depend on the amount of transfer.
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90
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Zelig R, Chung M, Touger-Decker R, Byham-Gray L. The Relationships between Missing Teeth and/or Dental Prostheses and Indicators of Nutritional Status in Older Adults: A Systematic Review. J Acad Nutr Diet 2014. [DOI: 10.1016/j.jand.2014.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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91
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Zhang C, Casas-Tintó S, Li G, Lin N, Chung M, Moreno E, Moberg KH, Zhou L. An intergenic regulatory region mediates Drosophila Myc-induced apoptosis and blocks tissue hyperplasia. Oncogene 2014; 34:2385-97. [PMID: 24931167 PMCID: PMC4268096 DOI: 10.1038/onc.2014.160] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 04/16/2014] [Accepted: 04/18/2014] [Indexed: 12/31/2022]
Abstract
Induction of cell-autonomous apoptosis following oncogene-induced overproliferation is a major tumor-suppressive mechanism in vertebrates. However, the detailed mechanism mediating this process remains enigmatic. In this study, we demonstrate that dMyc-induced cell-autonomous apoptosis in the fruit fly Drosophila melanogaster relies on an intergenic sequence termed the IRER (irradiation-responsive enhancer region). The IRER mediates the expression of surrounding proapoptotic genes, and we use an in vivo reporter of the IRER chromatin state to gather evidence that epigenetic control of DNA accessibility within the IRER is an important determinant of the strength of this response to excess dMyc. In a previous work, we showed that the IRER also mediates P53-dependent induction of proapoptotic genes following DNA damage, and the chromatin conformation within IRER is regulated by polycomb group-mediated histone modifications. dMyc-induced apoptosis and the P53-mediated DNA damage response thus overlap in a requirement for the IRER. The epigenetic mechanisms controlling IRER accessibility appear to set thresholds for the P53- and dMyc-induced expression of apoptotic genes in vivo and may have a profound impact on cellular sensitivity to oncogene-induced stress.
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92
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Sym S, Kim Y, Park I, Ahn H, Hong J, Park J, Cho E, Lee J, Lee W, Chung M, Kim HS, Shin D. P208 A pilot study of low-dose capecitabine plus trastuzumab as first-line treatment for patients older than 75 years with HER2-positive advanced gastric cancer. Eur J Cancer 2014. [DOI: 10.1016/j.ejca.2014.03.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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93
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Dordel J, Kim C, Chung M, Pardos de la Gándara M, Holden MTJ, Parkhill J, de Lencastre H, Bentley SD, Tomasz A. Novel determinants of antibiotic resistance: identification of mutated loci in highly methicillin-resistant subpopulations of methicillin-resistant Staphylococcus aureus. mBio 2014; 5:e01000. [PMID: 24713324 PMCID: PMC3993859 DOI: 10.1128/mbio.01000-13] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 03/10/2014] [Indexed: 12/30/2022] Open
Abstract
We identified mutated genes in highly resistant subpopulations of methicillin-resistant Staphylococcus aureus (MRSA) that are most likely responsible for the historic failure of the β-lactam family of antibiotics as therapeutic agents against these important pathogens. Such subpopulations are produced during growth of most clinical MRSA strains, including the four historically early MRSA isolates studied here. Chromosomal DNA was prepared from the highly resistant cells along with DNA from the majority of cells (poorly resistant cells) followed by full genome sequencing. In the highly resistant cells, mutations were identified in 3 intergenic sequences and 27 genes representing a wide range of functional categories. A common feature of these mutations appears to be their capacity to induce high-level β-lactam resistance and increased amounts of the resistance protein PBP2A in the bacteria. The observations fit a recently described model in which the ultimate controlling factor of the phenotypic expression of β-lactam resistance in MRSA is a RelA-mediated stringent response. IMPORTANCE It has been well established that the level of antibiotic resistance (i.e., minimum concentration of a β-lactam antibiotic needed to inhibit growth) of a methicillin-resistant Staphylococcus aureus (MRSA) strain depends on the transcription and translation of the resistance protein PBP2A. Here we describe mutated loci in an additional novel set of genetic determinants that appear to be essential for the unusually high resistance levels typical of subpopulations of staphylococci that are produced with unique low frequency in most MRSA clinical isolates. We propose that mutations in these determinants can trigger induction of the stringent stress response which was recently shown to cause increased transcription/translation of the resistance protein PBP2A in parallel with the increased level of resistance.
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Paik K, Chung M, Hyun J, Atashroo D, McArdle A, Senarath-Yapa K, Zielins E, Tevlin R, Hu M, Ransom C, Meyer N, Domecus B, Rimsa J, Gurtner G, Longaker M, Wan D. Evaluation of Human Fat Graft Survival with an Adipose Injection Device Compared to the Coleman Technique for In Vivo Adipose Delivery. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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95
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Atashroo D, Raphel J, Chung M, Paik K, Parsi-Amon A, McArdle A, Senarath-Yapa K, Zielins E, Tevlin R, Duldulao C, Liautaud O, Rimsa J, Gurtner G, Longaker M, Heilshorn S, Wan D. Understanding the Physical Properties of Human Fat Graft: The Significance of Different Injection Techniques. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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96
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Chung M, Chan R, Fung Y, Fong S, Lam S, Lai C, Ng S. Reliability and validity of Alternate Step Test times in subjects with chronic stroke. J Rehabil Med 2014; 46:969-74. [DOI: 10.2340/16501977-1877] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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97
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Kim C, Mwangi M, Chung M, Milheirço C, de Lencastre H, Tomasz A. The mechanism of heterogeneous beta-lactam resistance in MRSA: key role of the stringent stress response. PLoS One 2013; 8:e82814. [PMID: 24349368 PMCID: PMC3857269 DOI: 10.1371/journal.pone.0082814] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Accepted: 10/28/2013] [Indexed: 11/30/2022] Open
Abstract
All methicillin resistant S. aureus (MRSA) strains carry an acquired genetic determinant – mecA or mecC - which encode for a low affinity penicillin binding protein –PBP2A or PBP2A′ – that can continue the catalysis of peptidoglycan transpeptidation in the presence of high concentrations of beta-lactam antibiotics which would inhibit the native PBPs normally involved with the synthesis of staphylococcal cell wall peptidoglycan. In contrast to this common genetic and biochemical mechanism carried by all MRSA strains, the level of beta-lactam antibiotic resistance shows a very wide strain to strain variation, the mechanism of which has remained poorly understood. The overwhelming majority of MRSA strains produce a unique – heterogeneous – phenotype in which the great majority of the bacteria exhibit very poor resistance often close to the MIC value of susceptible S. aureus strains. However, cultures of such heterogeneously resistant MRSA strains also contain subpopulations of bacteria with extremely high beta-lactam MIC values and the resistance level and frequency of the highly resistant cells in such strain is a characteristic of the particular MRSA clone. In the study described in this communication, we used a variety of experimental models to understand the mechanism of heterogeneous beta-lactam resistance. Methicillin-susceptible S. aureus (MSSA) that received the mecA determinant in the laboratory either on a plasmid or in the form of a chromosomal SCCmec cassette, generated heterogeneously resistant cultures and the highly resistant subpopulations that emerged in these models had increased levels of PBP2A and were composed of bacteria in which the stringent stress response was induced. Each of the major heterogeneously resistant clones of MRSA clinical isolates could be converted to express high level and homogeneous resistance if the growth medium contained an inducer of the stringent stress response.
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Heard BJ, Solbak NM, Achari Y, Chung M, Hart DA, Shrive NG, Frank CB. Changes of early post-traumatic osteoarthritis in an ovine model of simulated ACL reconstruction are associated with transient acute post-injury synovial inflammation and tissue catabolism. Osteoarthritis Cartilage 2013; 21:1942-9. [PMID: 24012772 DOI: 10.1016/j.joca.2013.08.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 08/15/2013] [Accepted: 08/26/2013] [Indexed: 02/02/2023]
Abstract
The study described here tested the hypothesis that early intra-articular inflammation is associated with the development of post-traumatic osteoarthritis (PTOA) in a sheep model. We extended previously published work in which we investigated joint gross morphology and synovial mRNA expression of inflammatory and catabolic molecules 2 weeks after anatomic Anterior cruciate ligament (ACL) autograft reconstructive surgery (ACL-R). The same variables have been analyzed at 20 weeks post surgery together with new experimental variables at both time points. Animals were sacrificed at 20 weeks post ACL-R surgery and their joints graded for signs of PTOA. Synovial samples were harvested for histological grading plus mRNA and protein analysis for a panel of inflammatory and catabolic molecules. The mRNA expression levels for this panel plus connective tissue matrix turnover molecules were also investigated in cartilage samples. Results of gross morphological assessments at 20 weeks post surgery showed some changes consistent with early OA, but indicated little progression of damage from the 2 week time point. While significant alterations in mRNA levels for synovial inflammatory and catabolic molecules were detected at 2 weeks, values had normalized by 20 weeks. Similarly, all mRNA expression levels for inflammatory and catabolic molecules in articular cartilage had returned to normal levels by 20 weeks post ACL-R surgery. We conclude that synovial inflammatory processes are initiated very early after ACL-R surgery and may instigate events that lead to the gross cartilage and joint abnormalities observed as early as 2 weeks. However, the absence of sustained inflammation and joint instability may prevent OA progression.
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Chung M, Collura MG, Flanagan G, Freemire B, Hanlet PM, Jana MR, Johnson RP, Kaplan DM, Leonova M, Moretti A, Popovic M, Schwarz T, Tollestrup A, Torun Y, Yonehara K. Pressurized H2 RF cavities in ionizing beams and magnetic fields. PHYSICAL REVIEW LETTERS 2013; 111:184802. [PMID: 24237526 DOI: 10.1103/physrevlett.111.184802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Indexed: 06/02/2023]
Abstract
A major technological challenge in building a muon cooling channel is operating rf cavities in multitesla external magnetic fields. We report the first proof-of-principle experiment of a high pressure gas-filled rf cavity for use with intense ionizing beams and strong external magnetic fields. rf power consumption by beam-induced plasma is investigated with hydrogen and deuterium gases with pressures between 20 and 100 atm and peak rf gradients between 5 and 50 MV/m. The low pressure case agrees well with an analytical model based on electron and ion mobilities. Varying concentrations of oxygen gas are investigated to remove free electrons from the cavity and reduce the rf power consumption. Measurements of the electron attachment time to oxygen and rate of ion-ion recombination are also made. Additionally, we demonstrate the operation of the gas-filled rf cavity in a solenoidal field of up to 3 T, finding no major magnetic field dependence. All these results indicate that a high pressure gas-filled cavity is a viable technology for muon ionization cooling.
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100
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Jana MR, Chung M, Freemire B, Hanlet P, Leonova M, Moretti A, Palmer M, Schwarz T, Tollestrup A, Torun Y, Yonehara K. Measurement of transmission efficiency for 400 MeV proton beam through collimator at Fermilab MuCool Test Area using Chromox-6 scintillation screen. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:063301. [PMID: 23822337 DOI: 10.1063/1.4808275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The MuCool Test Area (MTA) at Fermilab is a facility to develop the technology required for ionization cooling for a future Muon Collider and∕or Neutrino Factory. As part of this research program, feasibility studies of various types of RF cavities in a high magnetic field environment are in progress. As a unique approach, we have tested a RF cavity filled with a high pressure hydrogen gas with a 400 MeV proton beam in an external magnetic field (B = 3 T). Quantitative information about the number of protons passing through this cavity is an essential requirement of the beam test. The MTA is a flammable gas (hydrogen) hazard zone. Due to safety reasons, no active (energized) beam diagnostic instrument can be used. Moreover, when the magnetic field is on, current transformers (toroids) used for beam intensity measurements do not work due to the saturation of the ferrite material of the transformer. Based on these requirements, we have developed a passive beam diagnostic instrumentation using a combination of a Chromox-6 scintillation screen and CCD camera. This paper describes details of the beam profile and position obtained from the CCD image with B = 0 T and B = 3 T, and for high and low intensity proton beams. A comparison is made with beam size obtained from multi-wires detector. Beam transmission efficiency through a collimator with a 4 mm diameter hole is measured by the toroids and CCD image of the scintillation screen. Results show that the transmission efficiency estimated from the CCD image is consistent with the toroid measurement, which enables us to monitor the beam transmission efficiency even in a high magnetic field environment.
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