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Delprete C, Rimondini Giorgini R, Lucarini E, Bastiaanssen T, Scicchitano D, Interino N, Formaggio F, Uhlig F, Ghelardini C, Hyland N, Cryan J, Liguori R, Candela M, Fiori J, Turroni S, Di Cesare Mannelli L, Caprini M. Disruption of the microbiota-gut-brain axis is a defining characteristic of the α-Gal A (-/0) mouse model of Fabry disease. Gut Microbes 2023; 15:2256045. [PMID: 37712629 PMCID: PMC10506438 DOI: 10.1080/19490976.2023.2256045] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 07/27/2023] [Accepted: 09/01/2023] [Indexed: 09/16/2023] Open
Abstract
Fabry disease (FD) is an X-linked metabolic disease caused by a deficiency in α-galactosidase A (α-Gal A) activity. This causes accumulation of glycosphingolipids, especially globotriaosylceramide (Gb3), in different cells and organs. Neuropathic pain and gastrointestinal (GI) symptoms, such as abdominal pain, nausea, diarrhea, constipation, and early satiety, are the most frequent symptoms reported by FD patients and severely affect their quality of life. It is generally accepted that Gb3 and lyso-Gb3 are involved in the symptoms; nevertheless, the origin of these symptoms is complex and multifactorial, and the exact mechanisms of pathogenesis are still poorly understood. Here, we used a murine model of FD, the male α-Gal A (-/0) mouse, to characterize functionality, behavior, and microbiota in an attempt to elucidate the microbiota-gut-brain axis at three different ages. We provided evidence of a diarrhea-like phenotype and visceral hypersensitivity in our FD model together with reduced locomotor activity and anxiety-like behavior. We also showed for the first time that symptomology was associated with early compositional and functional dysbiosis of the gut microbiota, paralleled by alterations in fecal short-chain fatty acid levels, which partly persisted with advancing age. Interestingly, most of the dysbiotic features suggested a disruption of gut homeostasis, possibly contributing to accelerated intestinal transit, visceral hypersensitivity, and impaired communication along the gut-brain axis.
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Affiliation(s)
- C. Delprete
- Laboratory of Human and General Physiology, Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - R. Rimondini Giorgini
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | - E. Lucarini
- Department of Neuroscience, Psychology, Drug Research and Child Health, Neurofarba, Pharmacology and ToxicoKGMI_A_2256045logy Section, University of Florence, Florence, Italy
| | - T.F.S. Bastiaanssen
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - D. Scicchitano
- Unit of Microbiome Science and Biotechnology, Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - N. Interino
- Complex Operational Unit Clinica Neurologica, IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy
| | - F. Formaggio
- Laboratory of Human and General Physiology, Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - F. Uhlig
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- Department of Physiology, University College Cork, Cork, Ireland
| | - C. Ghelardini
- Department of Neuroscience, Psychology, Drug Research and Child Health, Neurofarba, Pharmacology and ToxicoKGMI_A_2256045logy Section, University of Florence, Florence, Italy
| | - N.P. Hyland
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- Department of Physiology, University College Cork, Cork, Ireland
| | - J.F. Cryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - R. Liguori
- Complex Operational Unit Clinica Neurologica, IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy
- Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, Bologna, ltaly
| | - M. Candela
- Unit of Microbiome Science and Biotechnology, Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - J. Fiori
- Complex Operational Unit Clinica Neurologica, IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy
- Department of Chemistry “G. Ciamician”, University of Bologna, Bologna, Italy
| | - S. Turroni
- Unit of Microbiome Science and Biotechnology, Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - L. Di Cesare Mannelli
- Department of Neuroscience, Psychology, Drug Research and Child Health, Neurofarba, Pharmacology and ToxicoKGMI_A_2256045logy Section, University of Florence, Florence, Italy
| | - M. Caprini
- Laboratory of Human and General Physiology, Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
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2
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Leigh SJ, Uhlig F, Wilmes L, Sanchez-Diaz P, Gheorghe CE, Goodson MS, Kelley-Loughnane N, Hyland NP, Cryan JF, Clarke G. The impact of acute and chronic stress on gastrointestinal physiology and function: a microbiota-gut-brain axis perspective. J Physiol 2023; 601:4491-4538. [PMID: 37756251 DOI: 10.1113/jp281951] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023] Open
Abstract
The physiological consequences of stress often manifest in the gastrointestinal tract. Traumatic or chronic stress is associated with widespread maladaptive changes throughout the gut, although comparatively little is known about the effects of acute stress. Furthermore, these stress-induced changes in the gut may increase susceptibility to gastrointestinal disorders and infection, and impact critical features of the neural and behavioural consequences of the stress response by impairing gut-brain axis communication. Understanding the mechanisms behind changes in enteric nervous system circuitry, visceral sensitivity, gut barrier function, permeability, and the gut microbiota following stress is an important research objective with pathophysiological implications in both neurogastroenterology and psychiatry. Moreover, the gut microbiota has emerged as a key aspect of physiology sensitive to the effects of stress. In this review, we focus on different aspects of the gastrointestinal tract including gut barrier function as well as the immune, humoral and neuronal elements involved in gut-brain communication. Furthermore, we discuss the evidence for a role of stress in gastrointestinal disorders. Existing gaps in the current literature are highlighted, and possible avenues for future research with an integrated physiological perspective have been suggested. A more complete understanding of the spatial and temporal dynamics of the integrated host and microbial response to different kinds of stressors in the gastrointestinal tract will enable full exploitation of the diagnostic and therapeutic potential in the fast-evolving field of host-microbiome interactions.
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Affiliation(s)
- Sarah-Jane Leigh
- APC Microbiome Ireland, Cork, Ireland
- Department of Psychiatry and Neurobehavioural Science, University College Cork, Cork, Ireland
| | - Friederike Uhlig
- APC Microbiome Ireland, Cork, Ireland
- Department of Physiology, University College Cork, Cork, Ireland
| | - Lars Wilmes
- APC Microbiome Ireland, Cork, Ireland
- Department of Psychiatry and Neurobehavioural Science, University College Cork, Cork, Ireland
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - Paula Sanchez-Diaz
- APC Microbiome Ireland, Cork, Ireland
- Department of Psychiatry and Neurobehavioural Science, University College Cork, Cork, Ireland
| | - Cassandra E Gheorghe
- APC Microbiome Ireland, Cork, Ireland
- Department of Psychiatry and Neurobehavioural Science, University College Cork, Cork, Ireland
| | - Michael S Goodson
- 711th Human Performance Wing, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio, USA
| | - Nancy Kelley-Loughnane
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio, USA
| | - Niall P Hyland
- APC Microbiome Ireland, Cork, Ireland
- Department of Physiology, University College Cork, Cork, Ireland
| | - John F Cryan
- APC Microbiome Ireland, Cork, Ireland
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - Gerard Clarke
- APC Microbiome Ireland, Cork, Ireland
- Department of Psychiatry and Neurobehavioural Science, University College Cork, Cork, Ireland
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3
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Cuesta-Marti C, Uhlig F, Muguerza B, Hyland N, Clarke G, Schellekens H. Microbes, oxytocin and stress: Converging players regulating eating behavior. J Neuroendocrinol 2023; 35:e13243. [PMID: 36872624 DOI: 10.1111/jne.13243] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/26/2023] [Accepted: 02/02/2023] [Indexed: 02/17/2023]
Abstract
Oxytocin is a peptide-hormone extensively studied for its multifaceted biological functions and has recently gained attention for its role in eating behavior, through its action as an anorexigenic neuropeptide. Moreover, the gut microbiota is involved in oxytocinergic signaling through the brain-gut axis, specifically in the regulation of social behavior. The gut microbiota is also implicated in appetite regulation and is postulated to play a role in central regulation of hedonic eating. In this review, we provide an overview on oxytocin and its individual links with the microbiome, the homeostatic and non-homeostatic regulation of eating behavior as well as social behavior and stress.
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Affiliation(s)
- Cristina Cuesta-Marti
- Department of Anatomy & Neuroscience, University College Cork, Cork, Ireland
- APC Microbiome Ireland, Cork, Ireland
| | - Friederike Uhlig
- APC Microbiome Ireland, Cork, Ireland
- Department of Physiology, University College Cork, Ireland
| | - Begoña Muguerza
- Department of Anatomy & Neuroscience, University College Cork, Cork, Ireland
- APC Microbiome Ireland, Cork, Ireland
- Universitat Rovira i Virgili, Department of Biochemistry & Biotechnology, Nutrigenomics Research Group, Tarragona, Spain
| | - Niall Hyland
- APC Microbiome Ireland, Cork, Ireland
- Department of Physiology, University College Cork, Ireland
| | - Gerard Clarke
- APC Microbiome Ireland, Cork, Ireland
- Department of Psychiatry & Neurobehavioural Science, University College Cork, Cork, Ireland
| | - Harriët Schellekens
- Department of Anatomy & Neuroscience, University College Cork, Cork, Ireland
- APC Microbiome Ireland, Cork, Ireland
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Johnson AC, Uhlig F, Einwag Z, Cataldo N, Erdos B. The neuroendocrine stress response impairs hippocampal vascular function and memory in male and female rats. Neurobiol Dis 2022; 168:105717. [PMID: 35385769 PMCID: PMC9018625 DOI: 10.1016/j.nbd.2022.105717] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/23/2022] [Accepted: 03/29/2022] [Indexed: 11/24/2022] Open
Abstract
Chronic psychological stress affects brain regions involved in memory such as the hippocampus and accelerates age-related cognitive decline, including in Alzheimer's disease and vascular dementia. However, little is known about how chronic stress impacts hippocampal vascular function that is critically involved in maintaining neurocognitive health that could contribute to stress-related memory dysfunction. Here, we used a novel experimental rat model that mimics the neuroendocrine and cardiovascular aspects of chronic stress to determine how the neuroendocrine components of the stress response affect hippocampal function. We studied both male and female rats to determine potential sex differences in the susceptibility of the hippocampus and its vasculature to neuroendocrine stress-induced dysfunction. We show that activation of neuroendocrine stress pathways impaired the vasoreactivity of hippocampal arterioles to mediators involved in coupling neuronal activity with local blood flow that was associated with impaired memory function. Interestingly, we found more hippocampal arteriolar dysfunction and scarcer hippocampal microvasculature in male compared to female rats that was associated with greater memory impairment, suggesting the male sex may be at increased risk of neuroendocrine-derived hippocampal dysfunction during chronic stress. Overall, this study revealed the therapeutic potential of targeting hippocampal arterioles to prevent or slow memory decline in the setting of prolonged and/or unavoidable stress.
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Affiliation(s)
- Abbie C Johnson
- Department of Neurological Sciences, University of Vermont Larner College of Medicine, Burlington, VT, 05405, USA.
| | - Friederike Uhlig
- Department of Pharmacology, University of Vermont Larner College of Medicine, Burlington, VT, 05405, USA
| | - Zachary Einwag
- Department of Pharmacology, University of Vermont Larner College of Medicine, Burlington, VT, 05405, USA
| | - Noelle Cataldo
- Department of Pharmacology, University of Vermont Larner College of Medicine, Burlington, VT, 05405, USA
| | - Benedek Erdos
- Department of Pharmacology, University of Vermont Larner College of Medicine, Burlington, VT, 05405, USA
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5
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Cataldo N, Uhlig F, Johnson AC, Erdos B. Analysis of Cerebrovascular Architecture in Experimental Models of Hypertension and Chronic Neuroendocrine Stress. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r4916] [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: 11/11/2022]
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6
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Johnson A, Uhlig F, Erdos B. Hippocampal Vascular Dysfunction and Impaired Memory in a Neuroendocrine Model of Stress and Hypertension. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.02132] [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: 11/11/2022]
Affiliation(s)
- Abbie Johnson
- Neurological SciencesUniversity of Vermont Larner College of MedicineBurlingtonVT
| | - Friederike Uhlig
- PharmacologyUniversity of Vermont Larner College of MedicineBurlingtonVT
| | - Benedek Erdos
- PharmacologyUniversity of Vermont Larner College of MedicineBurlingtonVT
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Uhlig F, Grundy L, Garcia-Caraballo S, Brierley SM, Foster SJ, Grundy D. Identification of a Quorum Sensing-Dependent Communication Pathway Mediating Bacteria-Gut-Brain Cross Talk. iScience 2020; 23:101695. [PMID: 33163947 PMCID: PMC7607502 DOI: 10.1016/j.isci.2020.101695] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 05/13/2020] [Revised: 07/03/2020] [Accepted: 10/14/2020] [Indexed: 12/12/2022] Open
Abstract
Despite recently established contributions of the intestinal microbiome to human health and disease, our understanding of bacteria-host communication pathways with regard to the gut-brain axis remains limited. Here we provide evidence that intestinal neurons are able to "sense" bacteria independently of the host immune system. Using supernatants from cultures of the opportunistic pathogen Staphylococcus aureus (S. aureus) we demonstrate the release of mediators with neuromodulatory properties at high population density. These mediators induced a biphasic response in extrinsic sensory afferent nerves, increased membrane permeability in cultured sensory neurons, and altered intestinal motility and secretion. Genetic manipulation of S. aureus revealed two key quorum sensing-regulated classes of pore forming toxins that mediate excitation and inhibition of extrinsic sensory nerves, respectively. As such, bacterial mediators have the potential to directly modulate gut-brain communication to influence intestinal symptoms and reflex function in vivo, contributing to homeostatic, behavioral, and sensory consequences of infection.
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Affiliation(s)
- Friederike Uhlig
- Department of Biomedical Science, University of Sheffield, Sheffield, UK
| | - Luke Grundy
- Visceral Pain Research Group, College of Medicine and Public Health, Flinders Health and Medical Research Institute (FHMRI), Flinders University, Bedford Park, SA, Australia
- Hopwood Centre for Neurobiology, Lifelong Health Theme, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, SA, Australia
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
| | - Sonia Garcia-Caraballo
- Visceral Pain Research Group, College of Medicine and Public Health, Flinders Health and Medical Research Institute (FHMRI), Flinders University, Bedford Park, SA, Australia
- Hopwood Centre for Neurobiology, Lifelong Health Theme, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, SA, Australia
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
| | - Stuart M. Brierley
- Visceral Pain Research Group, College of Medicine and Public Health, Flinders Health and Medical Research Institute (FHMRI), Flinders University, Bedford Park, SA, Australia
- Hopwood Centre for Neurobiology, Lifelong Health Theme, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, SA, Australia
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
| | - Simon J. Foster
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, UK
- Florey Institute, University of Sheffield, Sheffield, UK
| | - David Grundy
- Department of Biomedical Science, University of Sheffield, Sheffield, UK
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8
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Uhlig F, Hennig GW, Lockwood S, Einwag Z, Nelson MT, Erdos B. Use of 3D Distance Mapping to examine Neuro‐Glia‐Vascular Plasticity in Rodent Models of Cardiovascular Disease. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.07233] [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: 11/11/2022]
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9
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Albusoda A, Barki N, Herregods T, Kamphuis JBJ, Karunaratne TB, Lazarou M, Lee I, Mazurak N, Perna E, Polster A, Pribic T, Uhlig F, Wang H, Enck P. A fresh look at IBS-opportunities for systems medicine approaches. Neurogastroenterol Motil 2017; 29. [PMID: 27997070 DOI: 10.1111/nmo.12989] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 10/02/2016] [Accepted: 10/10/2016] [Indexed: 02/08/2023]
Abstract
NeuroGUT is a EU-funded initial training network (ITN) of 14 research projects in neurogastroenterology that have employed an equal number of early-stage researchers. Neurogut trainees have-among other activities-attended an international conference on irritable bowel syndrome (IBS) in Bologna in 2016 and were asked to critically review and evaluate the current knowledge on IBS for their respective research activities, and to state what they were missing. Most appreciated were the topics brain imaging of gut activity, the role of the gut microbiota, the pharmacology of gut functions, the IBS-IBD interrelation, the new Rome IV criteria, the role of gas, and the placebo response in functional disorders. Missed were more detailed coverage of high-resolution manometry, functional brain imaging, advanced "systems medicine" approaches and bioinformatics technology, better sub-classification of IBS patients, and the development of disease biomarkers, extended at the molecular (genetic/epigenetic, proteonomic) level. They summarize that despite excellent specialized research, there is a gap open that should be filled with systems medicine. For this, it would be necessary that medical research learns even more from the data sciences and other basic disciplines, for example, information technology and system biology, and also welcomes a change in paradigm that enhances open sharing of data, information, and resources.
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Affiliation(s)
- A Albusoda
- Queen Mary and Westfield College University of London, London, UK
| | - N Barki
- Technische Universität München, Munich, Germany
| | - T Herregods
- Academisch Medisch Centrum bij de Universiteit, Amsterdam, The Netherlands
| | - J B J Kamphuis
- Institut National de la Recherche Agronomique, Toulouse, France
| | | | - M Lazarou
- Technische Universität München, Munich, Germany
| | - I Lee
- Eberhard Karls Universität Tübingen, Tübingen, Germany
| | | | - E Perna
- Katholieke Universiteit Leuven, Leuven, Belgium
| | - A Polster
- Göteborgs Universitet, Gothenburg, Sweden
| | - T Pribic
- Fundacio Hospital Universitari Vall d'Hebron, Institut de Recerca, Barcelona, Spain
| | - F Uhlig
- University of Sheffield, Sheffield, UK
| | - H Wang
- Eberhard Karls Universität Tübingen, Tübingen, Germany
| | - P Enck
- Eberhard Karls Universität Tübingen, Tübingen, Germany
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10
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Belyanchikov MA, Zhukova ES, Tretiak S, Zhugayevych A, Dressel M, Uhlig F, Smiatek J, Fyta M, Thomas VG, Gorshunov BP. Vibrational states of nano-confined water molecules in beryl investigated by first-principles calculations and optical experiments. Phys Chem Chem Phys 2017; 19:30740-30748. [DOI: 10.1039/c7cp06472a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Using the DFT approach and optical spectroscopy, we provide a comprehensive analysis of IR excitation of water molecules confined in beryl nanopores.
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Affiliation(s)
- M. A. Belyanchikov
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
- 1. Physikalisches Institut
| | - E. S. Zhukova
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
| | - S. Tretiak
- Center for Integrated Nanotechnologies (CINT)
- Los Alamos National Laboratory
- Los Alamos
- USA
- Skolkovo Institute of Science and Technology
| | - A. Zhugayevych
- Skolkovo Institute of Science and Technology
- Moscow 143026
- Russia
| | - M. Dressel
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
- 1. Physikalisches Institut
| | - F. Uhlig
- Institute for Computational Physics
- Universität Stuttgart
- Germany
| | - J. Smiatek
- Institute for Computational Physics
- Universität Stuttgart
- Germany
| | - M. Fyta
- Institute for Computational Physics
- Universität Stuttgart
- Germany
| | - V. G. Thomas
- Sobolev Institute of Geology and Mineralogy
- RAS
- Russia
- Novosibirsk State University
- Novosibirsk 630090
| | - B. P. Gorshunov
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
- 1. Physikalisches Institut
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Bleckmann P, Englich U, Hermann U, Prass I, Ruhlandt-Senge K, Schürmann M, Schwittekh C, Uhlig F. Synthesis and Reactivity of Novel Bis(stannyl)silanes. Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-1999-0916] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Bis(stannyl)silanes of types R3Sn-SiR′2-SnR3 and R2(H)Sn-SiR′2-Sn(H)R2 with R′ being methyl, phenyl, iso-propyl or terf-butyl have been synthesized by treatment of difunctionalized diorganosilanes with alkali stannides (R = Me, tBu; R′= Me, iPr; 1 - 6, 8 ) or with triphenyltin chloride and magnesium (R = Ph; R′ = Me, iPh;Pr; 7, 9). Me3Sn-SitBu2-SnMe3 4, was halogenated using SnCl4, to yield the bis(chlorostannyl)silane 11.
The reaction of bis(stannyl)diorganosilanes R3SnSiR′SnR3 with catalytic amounts of Pd(PPh3)4 resulted in unexpected rearrangements under formation of the silyldistannanes R3SnSnR2SiR′R2. These compounds undergo addition reactions with alkynes. All compounds have been identified by NMR, IR, MS and elemental analysis. Compounds 5, 6 and 7 have also been characterized by X-ray crystallography.
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Affiliation(s)
- P. Bleckmann
- Fachbereich Chemie der Universität Dortmund, Organische Strukturchemie, Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
| | - U. Englich
- Syracuse University, Department of Chemistry, 1-014 Center of Science and Technology, Syracuse, N.Y., USA
| | - U. Hermann
- Fachbereich Chemie der Universität Dortmund, Anorganische Chemie II, Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
| | - I. Prass
- Fachbereich Chemie der Universität Dortmund, Anorganische Chemie II, Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
| | - K. Ruhlandt-Senge
- Syracuse University, Department of Chemistry, 1-014 Center of Science and Technology, Syracuse, N.Y., USA
| | - M. Schürmann
- Fachbereich Chemie der Universität Dortmund, Anorganische Chemie II, Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
| | - C. Schwittekh
- Fachbereich Chemie der Universität Dortmund, Organische Strukturchemie, Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
| | - F. Uhlig
- Fachbereich Chemie der Universität Dortmund, Anorganische Chemie II, Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
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12
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Witek G, Siebenhofer M, Uhlig F. Entwicklung eines kontinuierlichen Reaktors zur Herstellung von monofunktionellen Polysiloxanen. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050642] [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]
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13
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Witek G, Siebenhofer M, Uhlig F. Entwicklung eines kontinuierlichen Reaktors zur Herstellung von monofunktionellen Oligosiloxanen. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Witek G, Brandstätter M, Siebenhofer M, Uhlig F. Kinetische und thermodynamische Eigenschaften der Ringöffnungsreaktion von cyclischen Siloxanen am Beispiel von Hexamethylcyclotrisiloxan (D3). CHEM-ING-TECH 2008. [DOI: 10.1002/cite.200750737] [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: 11/09/2022]
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15
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Zarl E, Baumgartner J, Decker K, Fischer R, Seibt B, Uhlig F. Solvent Influence in Reactions of Fluoroalkyl Sulfonic Acids with Phenyldistannanes. PHOSPHORUS SULFUR 2008. [DOI: 10.1080/10426500701804910] [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: 10/21/2022]
Affiliation(s)
- E. Zarl
- a Institute for Inorganic Chemistry , Graz University of Technology , Graz , Austria
| | - J. Baumgartner
- a Institute for Inorganic Chemistry , Graz University of Technology , Graz , Austria
| | - K. Decker
- a Institute for Inorganic Chemistry , Graz University of Technology , Graz , Austria
| | - R. Fischer
- a Institute for Inorganic Chemistry , Graz University of Technology , Graz , Austria
| | - B. Seibt
- a Institute for Inorganic Chemistry , Graz University of Technology , Graz , Austria
| | - F. Uhlig
- a Institute for Inorganic Chemistry , Graz University of Technology , Graz , Austria
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Uhlig F, Stadelmann B, Zechmann A, Lassacher P, Stüger H, Hengge E. Darstellung und Reaktivität von Phenylthiosubstituierten Oligosilanen. PHOSPHORUS SULFUR 2006. [DOI: 10.1080/10426509408016383] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- F. Uhlig
- a Graz (Österreich), Institut für Anorganische Chemie der Technischen Universität , A-8010, Graz, Austria
| | - B. Stadelmann
- a Graz (Österreich), Institut für Anorganische Chemie der Technischen Universität , A-8010, Graz, Austria
| | - A. Zechmann
- a Graz (Österreich), Institut für Anorganische Chemie der Technischen Universität , A-8010, Graz, Austria
| | - P. Lassacher
- a Graz (Österreich), Institut für Anorganische Chemie der Technischen Universität , A-8010, Graz, Austria
| | - H. Stüger
- a Graz (Österreich), Institut für Anorganische Chemie der Technischen Universität , A-8010, Graz, Austria
| | - E. Hengge
- a Graz (Österreich), Institut für Anorganische Chemie der Technischen Universität , A-8010, Graz, Austria
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Scheinast W, Böttcher I, Debowski M, Dohrmann F, Förster A, Grosse E, Koczoń P, Kohlmeyer B, Laue F, Menzel M, Naumann L, Schwab E, Senger P, Shin Y, Ströbele H, Sturm C, Surówka G, Uhlig F, Wagner A, Waluś W, Kämpfer B, Barz HW. In-medium effects on phase space distributions of antikaons measured in proton-nucleus collisions. Phys Rev Lett 2006; 96:072301. [PMID: 16606077 DOI: 10.1103/physrevlett.96.072301] [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] [Subscribe] [Scholar Register] [Received: 02/03/2005] [Indexed: 05/08/2023]
Abstract
Differential production cross sections of K+/- mesons have been measured in p + C and p + Au collisions at 1.6, 2.5, and 3.5 GeV proton beam energy. At beam energies close to the production threshold, the K- multiplicity is strongly enhanced with respect to proton-proton collisions. According to microscopic transport calculations, this enhancement is caused by two effects: the strangeness exchange reaction NY --> K- NN and an attractive in-medium K- N potential at saturation density.
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Affiliation(s)
- W Scheinast
- Forschungszentrum Rossendorf, D-01314 Dresden, Germany
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Uhlig F, Förster A, Böttcher I, Debowski M, Dohrmann F, Grosse E, Koczoń P, Kohlmeyer B, Laue F, Menzel M, Naumann L, Oeschler H, Scheinast W, Schwab E, Senger P, Shin Y, Ströbele H, Sturm C, Surówka G, Wagner A, Waluś W. Observation of different azimuthal emission patterns of K+ and of K- mesons in heavy-ion collisions at 1-2 A GeV. Phys Rev Lett 2005; 95:012301. [PMID: 16090609 DOI: 10.1103/physrevlett.95.012301] [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] [Subscribe] [Scholar Register] [Received: 10/15/2004] [Indexed: 05/03/2023]
Abstract
Azimuthal distributions of pi+, K+, and K- mesons have been measured in Au+Au reactions at 1.5A GeV and Ni+Ni reactions at 1.93 A GeV. In semicentral collisions at midrapidity, pi+ and K+ mesons are emitted preferentially perpendicular to the reaction plane in both collision systems. In contrast for K- mesons in Ni+Ni reactions, an in-plane elliptic flow was observed for the first time at these incident energies.
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Affiliation(s)
- F Uhlig
- Technische Universität Darmstadt, D-64289 Darmstadt, Germany
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Bleckmann P, Brüggemann T, Maslennikov S, Schollmeier T, Schürmann M, Spirina I, Tsarev M, Uhlig F. Magnesium and chlorostannanes—building blocks for novel tinmodified silanes. J Organomet Chem 2003. [DOI: 10.1016/j.jorganchem.2003.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Förster A, Uhlig F, Böttcher I, Debowski M, Dohrmann F, Grosse E, Koczoń P, Kohlmeyer B, Laue F, Menzel M, Naumann L, Oeschler H, Scheinast W, Schwab E, Senger P, Shin Y, Ströbele H, Sturm C, Surówka G, Wagner A, Waluś W. First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions. Phys Rev Lett 2003; 91:152301. [PMID: 14611460 DOI: 10.1103/physrevlett.91.152301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2002] [Indexed: 05/24/2023]
Abstract
Differential production cross sections of K- and K+ mesons have been measured in Ni+Ni and Au+Au collisions at a beam energy of 1.5 A GeV. The K(-)/K(+) ratio is found to be nearly constant as a function of the collision centrality and system size. The spectral slopes and the polar emission pattern differ for K- and K+ mesons. These observations indicate that K+ mesons decouple earlier from the fireball than K- mesons.
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Affiliation(s)
- A Förster
- Technische Universität, Darmstadt, D-64289 Darmstadt, Germany
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Schümann F, Hammache F, Typel S, Uhlig F, Sümmerer K, Böttcher I, Cortina D, Förster A, Gai M, Geissel H, Greife U, Iwasa N, Koczoń P, Kohlmeyer B, Kulessa R, Kumagai H, Kurz N, Menzel M, Motobayashi T, Oeschler H, Ozawa A, Płoskoń M, Prokopowicz W, Schwab E, Senger P, Strieder F, Sturm C, Sun ZY, Surówka G, Wagner A, Waluś W. Coulomb dissociation of 8B and the low-energy cross section of the 7Be(p,gamma)8B solar fusion reaction. Phys Rev Lett 2003; 90:232501. [PMID: 12857251 DOI: 10.1103/physrevlett.90.232501] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2003] [Indexed: 05/24/2023]
Abstract
An exclusive measurement of the Coulomb breakup of 8B into 7Be+p at 254A MeV allowed the study of the angular correlations of the breakup particles. These correlations demonstrate clearly that E1 multipolarity dominates and that E2 multipolarity can be neglected. By using a simple single-particle model for 8B and treating the breakup in first-order perturbation theory, we extract a zero-energy S factor of S17(0)=18.6+/-1.2+/-1.0 eV b, where the first error is experimental and the second one reflects the theoretical uncertainty in the extrapolation.
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Affiliation(s)
- F Schümann
- Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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Sturm C, Böttcher I, D&ecedil;bowski M, Förster A, Grosse E, Koczoń P, Kohlmeyer B, Laue F, Mang M, Naumann L, Oeschler H, Pühlhofer F, Schwab E, Senger P, Shin Y, Speer J, Ströbele H, Surówka G, Uhlig F, Wagner A, Waluś W. Evidence for a Soft Nuclear Equation-of-State from Kaon Production in Heavy-Ion Collisions. Phys Rev Lett 2001; 86:39-42. [PMID: 11136088 DOI: 10.1103/physrevlett.86.39] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2000] [Indexed: 05/23/2023]
Abstract
The production of pions and kaons has been measured in 197Au+197Au collisions at beam energies from 0.6 to 1.5A GeV with the kaon spectrometer at SIS/GSI. The K+ meson multiplicity per nucleon is enhanced in Au+Au collisions by factors up to 6 relative to C+C reactions, whereas the corresponding pion ratio is reduced. The ratio of the K+ meson excitation functions for Au+Au and C+C collisions increases with decreasing beam energy. This behavior is expected for a soft nuclear equation-of-state.
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Affiliation(s)
- C Sturm
- Technische Universität Darmstadt, D-64289 Darmstadt, Germany
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Englich U, Hengge E, Hermann U, Marschner C, Ruhlandt-Senge K, Uhlig F. Cyclohexasilanes with exocyclic organogermanium, -tin or -lead groups. J Organomet Chem 2000. [DOI: 10.1016/s0022-328x(00)00249-7] [Citation(s) in RCA: 10] [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: 11/16/2022]
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Hermann U, Prass I, Uhlig F. New Silicon and Tin Containing Ring and Cage Compounds Syntheses and Reactivity. PHOSPHORUS SULFUR 1997. [DOI: 10.1080/10426509708046802] [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: 10/23/2022]
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Hermann U, Prass I, Uhlig F. New Silicon and Tin Containing Ring and Cage Compounds - Syntheses and Reactivity. PHOSPHORUS SULFUR 1997. [DOI: 10.1080/10426509708545651] [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: 10/22/2022]
Affiliation(s)
- U. Hermann
- a Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
- b Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
- c Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - I. Prass
- a Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
- b Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
- c Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - F. Uhlig
- a Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
- b Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
- c Department of Inorganic Chemistry II , Dortmund University , Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
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Uhlig F, Herrmann E, Sch�dler D, Ohms G, Gro�mann G, Besser S, Herbst-Irmer R. Zur Chemie von Sulfiden und Seleniden prim�rer Phosphane ? Die (1-Hydroxyalkyl)-organyl-phosphansulfide und -selenide, neue Verbindungsklassen. Z Anorg Allg Chem 1993. [DOI: 10.1002/zaac.19936191123] [Citation(s) in RCA: 12] [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: 11/08/2022]
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Scheer M, Uhlig F, Nam TT, Dargatz M, Sch�dler HD, Herrmann E. Darstellung und Reaktivit�t von Tris(dialkylthiophoshinyl)-phosphanen. Z Anorg Allg Chem 1990. [DOI: 10.1002/zaac.19905850120] [Citation(s) in RCA: 15] [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: 11/09/2022]
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Lindenau KF, Olthoff D, Adam H, Graff J, Duck HJ, Uhlig F, Richter K. [Coronary surgery in females]. Herz 1987; 12:296-301. [PMID: 3498671] [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: 01/06/2023]
Abstract
In the last three years, of a total of 617 patients undergoing surgery for ischemic heart disease, 53 were women (8.6%). With one exception, all were in or shortly before the menopause. As compared with men, the women were found to have a preponderance of risk factors. The most unfavorable combination, that of hypertension and hypercholesterolemia, was present in one-third of the patients. Hospital mortality for isolated revascularization was higher in women at 4.9% than in men at 1.5%. The one-year survival rates, however, of 94.4% and 95%, respectively, did not differ between the two sexes. In women, the number of grafts per patient was 2.1 as compared with 2.9 in men. Complete revascularization was achieved less frequently in women than in men; similarly graft patency rate at one year of 66% in women was less than the 84% observed in men. The more marked coronary sclerosis as well as morphologic characteristics of coronary arteries in women construe a special challenge to the surgeon and prerequisite a high degree of technical skill.
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