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Apiñaniz JI, Malko S, Fedosejevs R, Cayzac W, Vaisseau X, de Luis D, Gatti G, McGuffey C, Bailly-Grandvaux M, Bhutwala K, Ospina-Bohorquez V, Balboa J, Santos JJ, Batani D, Beg F, Roso L, Perez-Hernandez JA, Volpe L. A quasi-monoenergetic short time duration compact proton source for probing high energy density states of matter. Sci Rep 2021; 11:6881. [PMID: 33767262 PMCID: PMC7994565 DOI: 10.1038/s41598-021-86234-x] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 03/09/2021] [Indexed: 11/09/2022] Open
Abstract
We report on the development of a highly directional, narrow energy band, short time duration proton beam operating at high repetition rate. The protons are generated with an ultrashort-pulse laser interacting with a solid target and converted to a pencil-like narrow-band beam using a compact magnet-based energy selector. We experimentally demonstrate the production of a proton beam with an energy of 500 keV and energy spread well below 10[Formula: see text], and a pulse duration of 260 ps. The energy loss of this beam is measured in a 2 [Formula: see text]m thick solid Mylar target and found to be in good agreement with the theoretical predictions. The short time duration of the proton pulse makes it particularly well suited for applications involving the probing of highly transient plasma states produced in laser-matter interaction experiments. This proton source is particularly relevant for measurements of the proton stopping power in high energy density plasmas and warm dense matter.
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Affiliation(s)
- J I Apiñaniz
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain.
| | - S Malko
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - R Fedosejevs
- Department of Electrical and Computing Engineering, University of Alberta, Edmonton, AB, T6G 2V4, Canada
| | - W Cayzac
- CEA, DAM, DIF, 91297, Arpajon, France
| | | | - D de Luis
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - G Gatti
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - C McGuffey
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - M Bailly-Grandvaux
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - K Bhutwala
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - V Ospina-Bohorquez
- University of Salamanca, Salamanca, Spain.,CEA, DAM, DIF, 91297, Arpajon, France.,CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, University of Bordeaux, 33405, Talence, France
| | - J Balboa
- University of Salamanca, Salamanca, Spain
| | - J J Santos
- CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, University of Bordeaux, 33405, Talence, France
| | - D Batani
- CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, University of Bordeaux, 33405, Talence, France
| | - F Beg
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - L Roso
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - J A Perez-Hernandez
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - L Volpe
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain.,Laser-Plasma Chair at the University of Salamanca, Salamanca, Spain.,Instituto Universitario Física Fundamental y Matemáticas, 37008, Salamanca, Spain
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2
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Heywood A, Schneider JA, Bennett DA, Arfanakis K, Beg F, Wang L. Hippocampal subfield deformation shows unique patterns associated with amyloid‐beta, TDP‐43, and PHF‐tau burden. Alzheimers Dement 2020. [DOI: 10.1002/alz.039864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | - David A Bennett
- Rush Alzheimer's Disease Center Rush University Medical Center Chicago IL USA
| | | | - Faisal Beg
- Simon Fraser University Burnaby BC Canada
| | - Lei Wang
- Northwestern University Chicago IL USA
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3
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Dicks E, He Y, Beg F, Biessels GJ, Carmeli C, Chen G, Çiftçi K, Dai Z, Van Dellen E, Dyrba M, Friedman EJ, Haan W, Jalili M, Jeong J, Jeong Y, Jiang T, Knyazeva MG, Lee DY, Li SJ, Liu Y, McCarthy P, Rodriguez LP, Phillips D, Raamana PR, Reijmer YD, Seo EH, Sepulcre J, Soldan A, Suckling J, Taylor JP, Teng GJ, Wink AM, Barkhof F, Scheltens P, Flier WM, Tijms BM. P3‐342: INFLUENCE OF NETWORK CONSTRUCTION METHODS ON PATH LENGTH VALUES IN ALZHEIMER'S DISEASE: A MULTI‐STUDY ANALYSIS OF MRI CONNECTIVITY STUDIES. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Ellen Dicks
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Yong He
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain ResearchBeijing Normal UniversityBeijingChina
| | | | - Geert Jan Biessels
- Department of Neurology, Brain Center Rudolf MagnusUniversity Medical Center UtrechtUtrechtNetherlands
| | | | | | | | - Zhengjia Dai
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain ResearchBeijing Normal UniversityBeijingChina
| | | | - Martin Dyrba
- German Center for Neurodegenerative DiseasesRostockGermany
| | | | - Willem Haan
- VU University Medical CenterAmsterdamNetherlands
| | | | | | | | - Tianzi Jiang
- Chinese Academy of SciencesBeijingChina
- University of Electronic Science and Technology of ChinaChengduChina
- Queensland Brain InsituteUniversity of QueenslandSt. LuciaAustralia
| | | | - Dong Young Lee
- Medical Research Center Seoul National UniversitySeoulSouth Korea
| | | | - Yong Liu
- Center for Excellence in Brain Science and Intelligence Technology, Institute of AutomationChinese Academy of SciencesBeijingChina
| | | | | | | | | | - Yael D. Reijmer
- Brain Center Rudolf Magnus/University Medical Center UtrechtUtrechtNetherlands
| | | | | | - Anja Soldan
- Johns Hopkins University School of MedicineBaltimoreMDUSA
| | | | - John-Paul Taylor
- Newcastle UniversityInstitute of NeuroscienceNewcastle upon TyneUnited Kingdom
| | | | - Alle Meije Wink
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Frederik Barkhof
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
- Translational Imaging Group, Centre for Medical Image ComputingDepartment of Medical Physics and Biomedical Engineering, UCLLondonUnited Kingdom
| | - Philip Scheltens
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Wiesje M. Flier
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Betty M. Tijms
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
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4
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Popuri K, Balachandar R, Alpert KI, Lu D, Bhalla M, Mackenzie IR, Robin Hsiung GY, Wang L, Beg F. P3‐353: DEVELOPMENT AND VALIDATION OF A NOVEL DEMENTIA OF ALZHEIMER'S TYPE (DAT) SCORE BASED ON METABOLISM FDG‐PET IMAGING. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Lei Wang
- Northwestern University Feinberg School of MedicineChicagoILUSA
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5
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Dicks E, He Y, Beg F, Biessels GJ, Carmeli C, Chen G, Çiftçi K, Dai Z, Van Dellen E, Dyrba M, Friedman EJ, Haan W, Jalili M, Jeong J, Jeong Y, Jiang T, Knyazeva MG, Lee DY, Li SJ, Liu Y, McCarthy P, Rodriguez LP, Phillips D, Raamana PR, Reijmer YD, Seo EH, Sepulcre J, Soldan A, Suckling J, Taylor JP, Teng GJ, Wink AM, Barkhof F, Scheltens P, Flier WM, Tijms BM. IC‐P‐032: INFLUENCE OF NETWORK CONSTRUCTION METHODS ON PATH LENGTH VALUES IN ALZHEIMER'S DISEASE: A MULTI‐STUDY ANALYSIS OF MRI CONNECTIVITY STUDIES. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.2096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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)
- Ellen Dicks
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Yong He
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain ResearchBeijing Normal UniversityBeijingChina
| | | | - Geert Jan Biessels
- Department of Neurology, Brain Center Rudolf MagnusUniversity Medical Center UtrechtUtrechtNetherlands
| | | | | | | | - Zhengjia Dai
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain ResearchBeijing Normal UniversityBeijingChina
| | | | - Martin Dyrba
- German Center for Neurodegenerative Diseases, Rostock, GermanyRostockGermany
| | | | - Willem Haan
- VU University Medical CenterAmsterdamNetherlands
| | | | | | | | - Tianzi Jiang
- Queensland Brain InstituteUniversity of QueenslandSt. LuciaAustralia
| | | | - Dong Young Lee
- Medical Research CenterSeoul National UniversitySeoulSouth Korea
| | | | - Yong Liu
- Center for Excellence in Brain Science and Intelligence Technology, Institute of AutomationChinese Academy of SciencesBeijingChina
| | | | | | | | | | - Yael D. Reijmer
- Brain Center Rudolf MagnusUniversity Medical Center UtrechtUtrechtNetherlands
| | | | | | - Anja Soldan
- Johns Hopkins UniversitySchool of MedicineBaltimoreMDUSA
| | | | - John-Paul Taylor
- Newcastle UniversityInstitute of NeuroscienceNewcastle upon TyneUnited Kingdom
| | | | - Alle Meije Wink
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Frederik Barkhof
- Dementia Research Centre and Department of Neurodegenerative Disease, UCL Institute of NeurologyUniversity College LondonLondonUnited Kingdom
| | - Philip Scheltens
- Alzheimer Center and Department of Neurology, Amsterdam NeuroscienceVU University Medical CenterAmsterdamNetherlands
| | - Wiesje M. Flier
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
| | - Betty M. Tijms
- VU University Medical CenterAmsterdam NeuroscienceAmsterdamNetherlands
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6
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Sio H, Hua R, Ping Y, McGuffey C, Beg F, Heeter R, Li CK, Petrasso RD, Collins GW. A broadband proton backlighting platform to probe shock propagation in low-density systems. Rev Sci Instrum 2017; 88:013503. [PMID: 28147638 DOI: 10.1063/1.4973893] [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: 06/06/2023]
Abstract
A proton backlighting platform has been developed for the study of strong shock propagation in low-density systems in planar geometry. Electric fields at the converging shock front in inertial confinement fusion implosions have been previously observed, demonstrating the presence of-and the need to understand-strong electric fields not modeled in standard radiation-hydrodynamic simulations. In this planar configuration, long-pulse ultraviolet lasers are used to drive a strong shock into a gas-cell target, while a short-pulse proton backlighter side-on radiographs the shock propagation. The capabilities of the platform are presented here. Future experiments will vary shock strength and gas fill, to probe shock conditions at different Z and Te.
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Affiliation(s)
- H Sio
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - R Hua
- Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA
| | - Y Ping
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C McGuffey
- Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA
| | - F Beg
- Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA
| | - R Heeter
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C K Li
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - R D Petrasso
- Massachusetts Institute of Technology Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
| | - G W Collins
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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7
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Rehman A, Imran S, Hassan M, Akhlaq A, Iqbal S, Beg F, Zahid G, Khalid H, Qadir FS, Murad HF, Baloch NUA, Awais M, Saleem S. Taxi drivers' attitudes toward road safety in Pakistan. Public Health 2015; 129:818-21. [PMID: 25936972 DOI: 10.1016/j.puhe.2015.03.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 02/23/2015] [Accepted: 03/18/2015] [Indexed: 11/28/2022]
Affiliation(s)
- A Rehman
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan.
| | - S Imran
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - M Hassan
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - A Akhlaq
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - S Iqbal
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - F Beg
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - G Zahid
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - H Khalid
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - F S Qadir
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - H F Murad
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - N U A Baloch
- Medical College, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
| | - M Awais
- Department of Radiology, Aga Khan University Hospital, Stadium Road, Karachi, Sindh, Pakistan
| | - S Saleem
- Department of Community Health Sciences, Aga Khan University, Stadium Road, Karachi, Sindh, Pakistan
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8
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Valenzuela M, Bartrés-Faz D, Beg F, Fornito A, Merlo-Pich E, Müller U, Öngür D, Toga AW, Yücel M. Neuroimaging as endpoints in clinical trials: are we there yet? Perspective from the first Provence workshop. Mol Psychiatry 2011; 16:1064-6. [PMID: 21625230 DOI: 10.1038/mp.2011.62] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M Valenzuela
- Regenerative Neuroscience Group, Neuropsychiatric Institute, Prince of Wales Hospital, Randwick, Sydney, NSW 2031, Australia.
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9
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Key MH, Akli K, Beg F, Chen MH, Chung HK, Freeman RR, Foord ME, Green JS, Gu P, Gregori G, Habara H, Hatchett SP, Hey D, Hill JM, King JA, Kodama R, Koch JA, Lancaster K, Lasinski BF, Langdon B, MacKinnon AJ, Murphy CD, Norreys PA, Patel N, Patel P, Pasley J, Snavely RA, Stephens RB, Stoeckl C, Tabak M, Theobald W, Tanaka K, Town R, Wilks SC, Yabuuchi T, Zhang B. Study of electron and proton isochoric heating for fast ignition. ACTA ACUST UNITED AC 2006. [DOI: 10.1051/jp4:2006133075] [Citation(s) in RCA: 8] [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: 11/15/2022]
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10
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Wang L, Beg F, Ratnanather T, Ceritoglu C, Younes L, Morris JC, Csernansky JG, Miller MI. Large deformation diffeomorphic metric mapping of vector fields. IEEE Trans Med Imaging 2005; 26:462-70. [PMID: 17427733 PMCID: PMC2848689 DOI: 10.1109/tmi.2005.853923] [Citation(s) in RCA: 138] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
This paper proposes a method to match diffusion tensor magnetic resonance images (DT-MRIs) through the large deformation diffeomorphic metric mapping of vector fields, focusing on the fiber orientations, considered as unit vector fields on the image volume. We study a suitable action of diffeomorphisms on such vector fields, and provide an extension of the Large Deformation Diffeomorphic Metric Mapping framework to this type of dataset, resulting in optimizing for geodesics on the space of diffeomorphisms connecting two images. Existence of the minimizers under smoothness assumptions on the compared vector fields is proved, and coarse to fine hierarchical strategies are detailed, to reduce both ambiguities and computation load. This is illustrated by numerical experiments on DT-MRI heart images.
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Affiliation(s)
- Lei Wang
- Department of Psychiatry, Washington University School of Medicine, Campus Box 8134, 660 S. Euclid Ave, St. Louis, MO 63110, USA.
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11
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Evans AT, McPhee C, Beg F, Evans FJ, Aitken A. The ability of diterpene esters with selective biological effects to activate protein kinase C and induce HL-60 cell differentiation. Biochem Pharmacol 1989; 38:2925-7. [PMID: 2775313 DOI: 10.1016/0006-2952(89)90451-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- A T Evans
- Laboratory of Protein Structure, National Institute for Medical Research, Mill Hill, London, U.K
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12
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Abstract
We have recently identified a novel peptide in the rabbit prostate complex which cross-reacts with an antibody to thyrotrophin-releasing hormone (TRH) and has the structure pGlu-Glu-ProNH2. In the present study, high concentrations of a TRH-related tripeptide and also a polypeptide (10-12 kDa) containing a TRH-immunoreactive peptide at its C-terminus were detected in human semen. The low molecular mass TRH-like peptide and the immunoreactive fragment from the polypeptide were isolated from human semen and shown to have identical structures. Amino acid analysis suggested compositions Glx2, Pro1, and after mild acid hydrolysis, the same sequence, Glu-Glu-Pro, was established for the two peptides. Fast atom bombardment (FAB) mass spectrometry yielded a pseudomolecular ion (M + H)+ of 355.38 which was identical to that of the synthetic peptide pGlu-Glu-ProNH2. The data demonstrate that human semen contains the TRH-like peptide pyroglutamylglutamylprolinamide and also a polypeptide terminating in the sequence Gln-Glu-ProNH2.
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Affiliation(s)
- S M Cockle
- National Institute for Medical Research, Mill Hill, London, England
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13
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Cockle SM, Aitken A, Beg F, Smyth DG. A novel peptide, pyroglutamylglutamylproline amide, in the rabbit prostate complex, structurally related to thyrotrophin-releasing hormone. J Biol Chem 1989; 264:7788-91. [PMID: 2498305] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
A novel peptide which cross-reacts with an antibody to thyrotrophin-releasing hormone has been isolated and characterized from the rabbit prostate complex. The peptide exhibited an amino acid composition of Glx1.7, Pro1.0, and automatic gas phase sequence analysis after mild acid hydrolysis established the sequence Glu-Glu-Pro. Fast atom bombardment mass spectrometry gave a pseudomolecular ion (M + H)+ of 355.2 confirming that the prostate peptide has the structure of pGlu-Glu-Pro-NH2. This peptide differs from authentic thyrotrophin-releasing hormone by the substitution of glutamic acid for histidine at position 2.
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Affiliation(s)
- S M Cockle
- National Institute for Medical Research, London, United Kingdom
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14
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Cockle SM, Aitken A, Beg F, Smyth DG. A novel peptide, pyroglutamylglutamylproline amide, in the rabbit prostate complex, structurally related to thyrotrophin-releasing hormone. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)83109-x] [Citation(s) in RCA: 57] [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: 11/26/2022] Open
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15
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Morrice N, Geary P, Cammack R, Harris A, Beg F, Aitken A. Primary structure of protein B from Pseudomonas putida, member of a new class of 2Fe-2S ferredoxins. FEBS Lett 1988; 231:336-40. [PMID: 3360142 DOI: 10.1016/0014-5793(88)80845-7] [Citation(s) in RCA: 24] [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] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The primary structure of the 2Fe-2S ferredoxin (protein B) from the benzene dioxygenase system of Pseudomonas putida strain NCIB 12190 was determined by gas-phase sequencing of the protein and its fragments. Fast atom bombardment mass spectrometry indicated a molecular mass of 11,860 Da. The sequence contained five cysteine residues, four of which would be required to coordinate the iron-sulphur cluster. The amino acid sequence determined in the present study is compared to that of a protein deduced from the DNA sequence from another strain of Pseudomonas putida. Little sequence homology was observed when protein B was compared to 2Fe-2S ferredoxins from plant and cyanobacterial sources. The novel sequence determined here suggests a new class of ferredoxin, which is consistent with the observed mid-point redox potential being significantly less negative (-155 mV) than those of the 2Fe-2S ferredoxins involved in photosynthesis (-310 to -455 mV).
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Affiliation(s)
- N Morrice
- Laboratory of Protein Structure, National Institute for Medical Research, Mill Hill, London, England
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16
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Beg F, Oldmeadow M, Morris A, Miller M, Nicholson G. Campylobacter pylori infection in patients undergoing endoscopy in Fiji. N Z Med J 1988; 101:140-1. [PMID: 3353031] [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: 01/05/2023]
Abstract
Forty two patients (20 Fijian and 22 Indian) presenting for endoscopy at the Colonial War Memorial Hospital, Suva, Fiji, were biopsied to detect Campylobacter pylori infection. Detection of the organism's urease activity in biopsy material or seeing the organism in Warthin-Starry silver stained histology sections were used to diagnose infection. Thirty-nine patients (93%) were infected; 19 of 20 Fijians (95%) and 20 of 22 Indians (91%). Of the 39 infected patients, 37 (95%) had chronic active gastritis and 24 (62%) had active peptic ulcer disease. The implications of these findings in relation to the management of endoscopy patients in Fiji are discussed.
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Affiliation(s)
- F Beg
- Medical Unit, Colonial War Memorial Hospital, Suva, Fiji
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17
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Scobie BA, Beg F, Oldmeadows M. Peptic diseases compared endoscopically in indigenous Fijians and Indians. N Z Med J 1987; 100:683-4. [PMID: 3452151] [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: 01/05/2023]
Abstract
Analysis was undertaken of 693 endoscopies performed in Suva, from July 1984 to June 1986. Although Indians presented more often in the ratio of 5:2, Fijians had a higher percentage of abnormalities. Gastric ulcer and carcinoma were more common in Fijians, whereas duodenal ulcer dominated in Indians. Gastric ulcer size and location showed no racial differences. Erosive disease of the oesophagus, stomach or duodenal bulb was uncommon in both races. Fijians were much more likely to present with bleeding, most commonly from gastric or duodenal ulcer (equal numbers).
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Affiliation(s)
- B A Scobie
- Gastro Unit, Wellington Hospital, New Zealand
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18
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Bradford AP, Aitken A, Beg F, Cook KG, Yeaman SJ. Amino acid sequence surrounding the lipoic acid cofactor of bovine kidney 2-oxoglutarate dehydrogenase complex. FEBS Lett 1987; 222:211-4. [PMID: 3115829 DOI: 10.1016/0014-5793(87)80221-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [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: 01/04/2023]
Abstract
The 2-oxoglutarate dehydrogenase complex was succinylated using 2-oxo[5-14C]glutarate in the presence of N-ethylmaleimide to label the lipoic acid cofactor of the transuccinylase (E2) component. Following peptic digestion, 14C-lipoate-containing peptides were purified and subjected to automated Edman degradation and amino acid analysis. The amino acid sequence surrounding the lipoyllysine residue is reported.
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Affiliation(s)
- A P Bradford
- Department of Biochemistry, University of Newcastle upon Tyne, England
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