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Abdullah M, Shah SIA, Jabbour K, John P, Ehsan MF, Karami AM, Ashiq MN, Allakhverdiev SI. Synthesis of NiMn 2O 4/PANI nanosized composite with increased specific capacitance for energy storage applications. Dalton Trans 2024. [PMID: 38700274 DOI: 10.1039/d4dt00722k] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Polyaniline (PANI) stands out as a highly promising conducting polymer with potential for advanced utilization in high-performance pseudocapacitors. Therefore, there exists a pressing need to bolster the structural durability of PANI, achievable by developing composite materials that can enhance its viability for supercapacitor applications. In this particular study, a pioneering approach was undertaken to produce a novel NiMn2O4/PANI supercapacitor electrode material. A comprehensive array of analytical techniques was employed to ascertain the structural configuration, morphology, oxidation states of elements, composition, and surface characteristics of the electrode material. The electrochemical evaluation of the NiMn2O4/PANI composite shows a specific capacitance (Cs) of 1530 ± 2 F g-1 at 1 A g-1. Significantly, the composite material displays an outstanding 93.61% retention of its capacity after an extensive 10 000 cycles, signifying remarkable cycling stability, while the 2-electrode configuration reveals a Cs value of 764 F g-1 at 5 mV s-1 and 826 F g-1 at 1 A g-1 with a smaller charge transfer resistance (Rct) value of 0.67 Ω. Chronoamperometric tests showed excellent stability of the fabricated material up to 50 h. This significant advancement bears immense promise for its potential implementation in high-efficiency energy storage systems and heralds a new phase in the development of supercapacitor technology with improved stability and performance metrics.
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Affiliation(s)
- Muhammad Abdullah
- Department of Chemistry, Government College University Lahore, Lahore-54000, Pakistan
| | - Syed Imran Abbas Shah
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan-60800, Pakistan.
| | - Karam Jabbour
- College of Engineering and Technology, American University of the Middle East, Egaila-54200, Kuwait
| | - Peter John
- Department of Chemistry, Government College University Lahore, Lahore-54000, Pakistan
| | - Muhammad Fahad Ehsan
- Department of Civil and Environmental Engineering, Northeastern University, Boston 02115, MA, USA
| | - Abdulnasser M Karami
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Muhammad Naeem Ashiq
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan-60800, Pakistan.
| | - Suleyman I Allakhverdiev
- Controlled Photobiosynthesis Laboratory, К.A. Timiryazev Institute of Plant Physiology RAS, Botanicheskaya Street 35, Moscow, 127276, Russia.
- Faculty of Engineering and Natural Sciences, Bahçeşehir University, Istanbul 34349, Türkiye
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Shabbir B, Jabbour K, Manzoor S, Ashiq MF, Fawy KF, Ashiq MN. Solvothermally designed Pr-MOF/Fe 2O 3 based nanocomposites for efficient electrocatalytic water splitting. Heliyon 2023; 9:e20261. [PMID: 37842581 PMCID: PMC10568344 DOI: 10.1016/j.heliyon.2023.e20261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 08/24/2023] [Accepted: 09/17/2023] [Indexed: 10/17/2023] Open
Abstract
To meet the energy demand of modern civilization, efforts to find renewable, safe, and highly effective fuel generation are still a big challenge. The oxygen evolution reaction (OER) is one of many modern technologies for hydrogen generation, and a number of new electrode materials have been created to increase the effectiveness of O2 evolution. This project utilizes a range of high performance nanomaterials, such as Pr-MOF, Fe2O3, and Pr-MOF/Fe2O3, to carry out the oxygen evolution reaction. This study shows that Pr-MOF/Fe2O3 exhibits exceptional electrocatalytic activity in alkaline solution with 238 mV overpotential at the current density of 10 mA cm-2 and a Tafel slope of 37 mV dec-1 which is much lower when compared to pure Pr-MOF and Fe2O3. The enhanced electrochemical results are due to the higher electrochemical surface area of 237 cm2. This work will lay the foundation for an approach to enhance the crystalline nature of surface-active nanoparticles made from rare earth MOFs for a range of electrochemical energy applications.
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Affiliation(s)
- Bushra Shabbir
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Karam Jabbour
- College of Engineering and Technology, American University of the Middle East, Kuwait
| | - Sumaira Manzoor
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Muhammad Faheem Ashiq
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Khaled Fahmi Fawy
- Department of Chemistry, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
| | - Muhammad Naeem Ashiq
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
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Kiran S, Jabbour K, Yasmeen G, Shafiq Z, Abbas A, Manzoor S, Hussain J, Al‐Harrasi A, Bajaber MA, Ragab AH, Ashiq MN. Nanocomposite of Nickel Benzene‐1,3,5‐tricarboxylic acid MOF with Multiwalled carbon nanotubes: A robust and effective electrocatalyst for OER in water splitting. Appl Organomet Chem 2023. [DOI: 10.1002/aoc.7090] [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: 03/29/2023]
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Gheytanzadeh M, Baghban A, Habibzadeh S, Jabbour K, Esmaeili A, Mashhadzadeh AH, Mohaddespour A. Intelligent route to design efficient CO 2 reduction electrocatalysts using ANFIS optimized by GA and PSO. Sci Rep 2022; 12:20859. [PMID: 36460814 PMCID: PMC9718738 DOI: 10.1038/s41598-022-25512-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 11/30/2022] [Indexed: 12/03/2022] Open
Abstract
Recently, electrochemical reduction of CO2 into value-added fuels has been noticed as a promising process to decrease CO2 emissions. The development of such technology is strongly depended upon tuning the surface properties of the applied electrocatalysts. Considering the high cost and time-consuming experimental investigations, computational methods, particularly machine learning algorithms, can be the appropriate approach for efficiently screening the metal alloys as the electrocatalysts. In doing so, to represent the surface properties of the electrocatalysts numerically, d-band theory-based electronic features and intrinsic properties obtained from density functional theory (DFT) calculations were used as descriptors. Accordingly, a dataset containg 258 data points was extracted from the DFT method to use in machine learning method. The primary purpose of this study is to establish a new model through machine learning methods; namely, adaptive neuro-fuzzy inference system (ANFIS) combined with particle swarm optimization (PSO) and genetic algorithm (GA) for the prediction of *CO (the key intermediate) adsorption energy as the efficiency metric. The developed ANFIS-PSO and ANFIS-GA showed excellent performance with RMSE of 0.0411 and 0.0383, respectively, the minimum errors reported so far in this field. Additionally, the sensitivity analysis showed that the center and the filling of the d-band are the most determining parameters for the electrocatalyst surface reactivity. The present study conveniently indicates the potential and value of machine learning in directing the experimental efforts in alloy system electrocatalysts for CO2 reduction.
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Affiliation(s)
- Majedeh Gheytanzadeh
- grid.411368.90000 0004 0611 6995Surface Reaction and Advanced Energy Materials Laboratory, Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Alireza Baghban
- grid.411368.90000 0004 0611 6995Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Mahshahr Campus, Mahshahr, Iran
| | - Sajjad Habibzadeh
- grid.411368.90000 0004 0611 6995Surface Reaction and Advanced Energy Materials Laboratory, Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Karam Jabbour
- grid.472279.d0000 0004 0418 1945College of Engineering and Technology, American University of the Middle East, Kuwait City, Kuwait
| | - Amin Esmaeili
- grid.452189.30000 0000 9023 6033Department of Chemical Engineering, School of Engineering Technology and Industrial Trades, College of the North Atlantic - Qatar, Doha, Qatar
| | - Amin Hamed Mashhadzadeh
- grid.428191.70000 0004 0495 7803Mechanical and Aerospace Engineering, School of Engineering and Digital Sciences, Nazarbayev University, 010000 Nur-Sultan, Kazakhstan
| | - Ahmad Mohaddespour
- grid.472279.d0000 0004 0418 1945College of Engineering and Technology, American University of the Middle East, Kuwait City, Kuwait
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Jabbour K, El Hassan N, Arabi M, Chemali R, Nasr Y. A thermodynamic methodology toward an optimized methane decomposition process for enhanced hydrogen production and low carbon accumulation: Effect of non-hydrocarbon co-feeds. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.09.040] [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: 01/17/2023]
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Al-Hazmi HE, Shokrani H, Shokrani A, Jabbour K, Abida O, Mousavi Khadem SS, Habibzadeh S, Sonawane SH, Saeb MR, Bonilla-Petriciolet A, Badawi M. Recent advances in aqueous virus removal technologies. Chemosphere 2022; 305:135441. [PMID: 35764113 PMCID: PMC9233172 DOI: 10.1016/j.chemosphere.2022.135441] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 06/13/2022] [Accepted: 06/20/2022] [Indexed: 05/09/2023]
Abstract
The COVID-19 outbreak has triggered a massive research, but still urgent detection and treatment of this virus seems a public concern. The spread of viruses in aqueous environments underlined efficient virus treatment processes as a hot challenge. This review critically and comprehensively enables identifying and classifying advanced biochemical, membrane-based and disinfection processes for effective treatment of virus-contaminated water and wastewater. Understanding the functions of individual and combined/multi-stage processes in terms of manufacturing and economical parameters makes this contribution a different story from available review papers. Moreover, this review discusses challenges of combining biochemical, membrane and disinfection processes for synergistic treatment of viruses in order to reduce the dissemination of waterborne diseases. Certainly, the combination technologies are proactive in minimizing and restraining the outbreaks of the virus. It emphasizes the importance of health authorities to confront the outbreaks of unknown viruses in the future.
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Affiliation(s)
- Hussein E Al-Hazmi
- Department of Sanitary Engineering, Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, Ul. Narutowicza 11/12, 80-233, Gdańsk, Poland
| | - Hanieh Shokrani
- Department of Chemical Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran
| | - Amirhossein Shokrani
- Department of Mechanical Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran
| | - Karam Jabbour
- College of Engineering and Technology, American University of the Middle East, Kuwait
| | - Otman Abida
- College of Engineering and Technology, American University of the Middle East, Kuwait
| | | | - Sajjad Habibzadeh
- Surface Reaction and Advanced Energy Materials Laboratory, Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
| | - Shirish H Sonawane
- Department of Chemical Engineering, National Institute of Technology Warangal, Warangal, 506004, Telangana, India
| | - Mohammad Reza Saeb
- Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza 11/12 80-233, Gdańsk, Poland
| | | | - Michael Badawi
- Université de Lorraine, Laboratoire de Physique et Chimie Théoriques LPCT UMR CNRS, 7019, Nancy, France.
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Nakhaei-Kohani R, Atashrouz S, Hadavimoghaddam F, Abedi A, Jabbour K, Hemmati-Sarapardeh A, Mohaddespour A. Chemical Structure and Thermodynamic Properties Based Models for Estimating Nitrous Oxide Solubility in Ionic Liquids: Equations of State and Machine Learning Approaches. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120445] [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: 10/14/2022]
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Jouyandeh M, Ganjali MR, Rezapour M, Mohaddespour A, Jabbour K, Vahabi H, Rabiee N, Habibzadeh S, Formela K, Saeb MR. Nonisothermal Cure Behavior and Kinetics of Cerium‐doped Fe
3
O
4
/Epoxy Nanocomposites. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6825] [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: 11/07/2022]
Affiliation(s)
- Maryam Jouyandeh
- Université de Lorraine, CentraleSupélec, LMOPS Metz France
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science University of Tehran Tehran Iran
| | - Mohammad Reza Ganjali
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science University of Tehran Tehran Iran
- National Institute of Genetic Engineering and Biotechnology (NIGEB) Tehran Iran
- Biosensor Research Center, Endocrinology and Metabolism Molecular‐Cellular Sciences Institute Tehran University of Medical Sciences Tehran Iran
| | - Morteza Rezapour
- IP Department Research Institute of Petroleum Industry (RIPI) Tehran Iran
| | - Ahmad Mohaddespour
- College of Engineering and Technology American University of the Middle East Kuwait
| | - Karam Jabbour
- College of Engineering and Technology American University of the Middle East Kuwait
| | - Henri Vahabi
- Université de Lorraine, CentraleSupélec, LMOPS Metz France
| | - Navid Rabiee
- School of Engineering Macquarie University Sydney New South Wales Australia
| | - Sajjad Habibzadeh
- Department of Chemical Engineering Amirkabir University of Technology (Tehran Polytechnic) Tehran Iran
| | - Krzysztof Formela
- Department of Polymer Technology Gdańsk University of Technology Gdańsk Poland
| | - Mohammad Reza Saeb
- Department of Polymer Technology Gdańsk University of Technology Gdańsk Poland
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Gheytanzadeh M, Baghban A, Habibzadeh S, Jabbour K, Esmaeili A, Mohaddespour A, Abida O. An insight into tetracycline photocatalytic degradation by MOFs using the artificial intelligence technique. Sci Rep 2022; 12:6615. [PMID: 35459922 PMCID: PMC9033875 DOI: 10.1038/s41598-022-10563-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 01/29/2022] [Accepted: 03/29/2022] [Indexed: 11/09/2022] Open
Abstract
Tetracyclines (TCs) have been extensively used for humans and animal diseases treatment and livestock growth promotion. The consumption of such antibiotics has been ever-growing nowadays due to various bacterial infections and other pathologic conditions, resulting in more discharge into the aquatic environments. This brings threats to ecosystems and human bodies. Up to now, several attempts have been made to reduce TC amounts in the wastewater, among which photocatalysis, an advanced oxidation process, is known as an eco-friendly and efficient technology. In this regard, metal organic frameworks (MOFs) have been known as the promising materials as photocatalysts. Thus, studying TC photocatalytic degradation by MOFs would help scientists and engineers optimize the process in terms of effective parameters. Nevertheless, the costly and time-consuming experimental methods, having instrumental errors, encouraged the authors to use the computational method for a more comprehensive assessment. In doing so, a wide-ranging databank including 374 experimental data points was gathered from the literature. A powerful machine learning method of Gaussian process regression (GPR) model with four kernel functions was proposed to estimate the TC degradation in terms of MOFs features (surface area and pore volume) and operational parameters (illumination time, catalyst dosage, TC concentration, pH). The GPR models performed quite well, among which GPR-Matern model shows the most accurate performance with R2, MRE, MSE, RMSE, and STD of 0.981, 12.29, 18.03, 4.25, and 3.33, respectively. In addition, an analysis of sensitivity was carried out to assess the effect of the inputs on the TC photodegradation by MOFs. It revealed that the illumination time and the surface area play a significant role in the decomposition activity.
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Affiliation(s)
- Majedeh Gheytanzadeh
- Surface Reaction and Advanced Energy Materials Laboratory, Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Alireza Baghban
- Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Mahshahr Campus, Mahshahr, Iran.
| | - Sajjad Habibzadeh
- Surface Reaction and Advanced Energy Materials Laboratory, Chemical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
| | - Karam Jabbour
- College of Engineering and Technology, American University of the Middle East, Kuwait City, Kuwait
| | - Amin Esmaeili
- Department of Chemical Engineering, School of Engineering Technology and Industrial Trades, College of the North Atlantic-Qatar, Doha, Qatar
| | - Ahmad Mohaddespour
- College of Engineering and Technology, American University of the Middle East, Kuwait City, Kuwait
| | - Otman Abida
- College of Engineering and Technology, American University of the Middle East, Kuwait City, Kuwait
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Jabbour H, Abou Haidar M, Jabbour K, Abi Lutfallah A, Abou Zeid H, Ghanem I, Naccache N, Ayoub E. Effect of prone position without volume expansion on pulse pressure variation in spinal surgery : a prospective observational study. Acta Anaest Belg 2021. [DOI: 10.56126/72.1.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Background : Pulse pressure variation (PPV) is a predictor of fluid responsiveness in supine patients under mechanical ventilation. Its use has also been validated in the prone position. The aim of this study was to assess changes in PPV induced by prone position in patients undergoing spinal surgery.
Methods : Ninety-six patients aged 12 to 75 years, scheduled for elective spinal surgery were included. Patients were excluded if they had clinical signs related to any organ failure, or if they required vasoactive drugs and/or volume expansion during the early stages of anesthesia. Patients received a standardized anesthesia protocol. Fluid expansion was not allowed from induction until 10 minutes after positioning. Hemodynamic measurements recorded before the induction of anesthesia (T0) included : arterial pressure (systolic (SAP) diastolic (DAP) and mean (MAP)) and heart rate (HR). Radial artery was cannulated after intubation and measurements, as well as PPV, were noted in supine position (T1). Patients were then placed in prone position hemodynamics and PPV measurements were repeated (T2).
Results : Forty-eight patients completed the study. Anesthesia induction induced a significant decrease in SAP, DAP, and MAP with no effect on HR. Prone position did not induce any significant changes in SAP, MAP, DAP, and HR. A significant difference was found between PPV values in supine (Mean=10.5, SD=4.5) and prone positions (Mean=15.2, SD=7.1) ; t=-4.15 (p<0.001). The mean increase in PPV was 4.7%.
Conclusion : Prone position without prior volume expansion induces a significant increase in PPV prior to any modification in arterial blood pressure and heart rate.
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El Samrout O, Karam L, Jabbour K, Massiani P, Launay F, El Hassan N. Investigation of new routes for the preparation of mesoporous calcium oxide supported nickel materials used as catalysts for the methane dry reforming reaction. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01219j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calcium oxide mesoporous supports were successfully synthetized and used to disperse nickel nanoparticles for the dry reforming of methane catalytic reaction.
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Affiliation(s)
- Ola El Samrout
- Faculty of Engineering
- Department of Chemical Engineering
- University of Balamand
- Amioun El Koura
- Lebanon
| | - Leila Karam
- Faculty of Engineering
- Department of Chemical Engineering
- University of Balamand
- Amioun El Koura
- Lebanon
| | - Karam Jabbour
- Faculty of Engineering
- Department of Chemical Engineering
- University of Balamand
- Amioun El Koura
- Lebanon
| | - Pascale Massiani
- CNRS UMR 7197
- Laboratoire de Réactivité de Surface, LRS
- Campus Pierre et Marie Curie
- Sorbonne Université
- F-75005 Paris
| | - Franck Launay
- CNRS UMR 7197
- Laboratoire de Réactivité de Surface, LRS
- Campus Pierre et Marie Curie
- Sorbonne Université
- F-75005 Paris
| | - Nissrine El Hassan
- Faculty of Engineering
- Department of Chemical Engineering
- University of Balamand
- Amioun El Koura
- Lebanon
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Jabbour K, El Hassan N, Davidson A, Casale S, Massiani P. Factors affecting the long-term stability of mesoporous nickel-based catalysts in combined steam and dry reforming of methane. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00032k] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Direct “one-pot” synthesis is highly efficient to obtain performing mesoporous Ni–Al2O3catalysts able to resist deactivation by sintering and coke deposition during CH4reforming by CO2and H2O to produce “metgas”.
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Affiliation(s)
- K. Jabbour
- Department of Chemical Engineering
- Faculty of Engineering
- University of Balamand
- Tripoli
- Lebanon
| | - N. El Hassan
- Department of Chemical Engineering
- Faculty of Engineering
- University of Balamand
- Tripoli
- Lebanon
| | - A. Davidson
- Laboratoire de Réactivité de Surface
- Sorbonne Universités
- UPMC Université Paris 06
- 75005 Paris
- France
| | - S. Casale
- Laboratoire de Réactivité de Surface
- Sorbonne Universités
- UPMC Université Paris 06
- 75005 Paris
- France
| | - P. Massiani
- Laboratoire de Réactivité de Surface
- Sorbonne Universités
- UPMC Université Paris 06
- 75005 Paris
- France
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Yazigi A, Jabbour K, Madi-Jebara S, Haddad F, Hayeck G, Tabet G. Myocardial infarction during left upper lobectomy in a patient with a LIMA graft. Anaesth Intensive Care 2009; 37:331-332. [PMID: 19402233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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Yazigi A, Madi-Jebara S, Haddad F, Hayek G, Jabbour K, Tabet G. Combined sciatic, femoral and obturator nerve blocks for an infra-inguinal arterial bypass graft surgery. Acta Anaesthesiol Scand 2009; 53:138-9. [PMID: 19128327 DOI: 10.1111/j.1399-6576.2008.01811.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Yazigi A, Abou-Zeid H, Madi-Jebara S, Haddad F, Hayek G, Jabbour K. Correlation between central venous oxygen saturation and oxygen delivery changes following fluid therapy. Acta Anaesthesiol Scand 2008; 52:1213-7. [PMID: 18823459 DOI: 10.1111/j.1399-6576.2008.01761.x] [Citation(s) in RCA: 10] [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: 01/20/2023]
Abstract
BACKGROUND The rationale for using central venous oxygen saturation (ScvO(2)) in various clinical scenarios is that it reflects the balance between oxygen delivery (DO(2)) and demands. In this study, we evaluated the correlation between ScvO(2) and DO(2) changes (Delta Do(2), DeltaScvO(2)) in patients receiving fluid therapy following coronary surgery. We also correlated the changes of mean arterial pressure (Delta MAP) and central venous pressure (Delta CVP), with Delta DO(2). METHODS Sixty consecutive sedated and mechanically ventilated adult patients, with cardiac index <or=2.3 L/min/m(2) and a pulmonary artery occlusion pressure <or=12 mmHg following coronary surgery, were included. Concomitant hemodynamic parameters, arterial and venous blood gases were measured before (T0) and after (T1) administration of a 500 ml bolus of an isotonic crystalloid solution over 30 min. The correlations between Delta DO(2) and DeltaScvO(2), Delta MAP or Delta CVP were evaluated by linear regression analysis and Pearson test. RESULTS Cardiac index (1.9+/-0.2 vs 2.3+/-0.5 ml/min/m(2)), MAP (83+/-11 vs 94+/-13 mm Hg) and CVP (5.7+/-3 vs 7.1+/-3 mmHg) were significantly higher at T1 compared with T0. The correlation of Delta DO(2) with DeltaScvO(2) was positive, significant (r=0.41; P=0.004) and superior to its correlation with Delta MAP (r=0.30; P=0.01) or Delta CVP (r=0.03; P=0.78). CONCLUSION A significant correlation between ScvO(2) and DO(2) changes was found in patients receiving fluid therapy following coronary surgery. ScvO(2) could be used as an indicator to track DO(2) and to guide volume loading.
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Affiliation(s)
- A Yazigi
- Department of Anesthesia and Surgical Intensive Care, Hotel-Dieu de France Hospital, Saint-Joseph University, Beirut, Lebanon.
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Quintard H, Cariou A, Jabbour K, Lasocki S, Montravers P, Dhainaut J, Desmonts J. Crit Care 2006; 10:P346. [DOI: 10.1186/cc4693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Jabbour H, Jabbour K, Ayoub EN, Yazbeck P, Antakly MC. [Spinal anaesthesia and Moya Moya disease]. ACTA ACUST UNITED AC 2004; 23:505-7. [PMID: 15158243 DOI: 10.1016/j.annfar.2004.01.007] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2003] [Accepted: 01/08/2004] [Indexed: 11/23/2022]
Abstract
Moya Moya is a rare disease of uncertain origin, characterised by stenosis of one or both of the internal carotid arteries and responsible of several neurological signs. We present the case of a boy with Moya Moya disease who was scheduled for an epiphisiodesis of the lateral malleola and had a spinal anaesthesia with hyperbaric bupivacaine 0.5% 10 mg without any perioperative complications. Any anaesthetic method could be used, provided special attention is given to avoid changes of capnea and blood pressure to preserve cerebral blood flow and palliate to cerebral flow steal.
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Affiliation(s)
- H Jabbour
- Département d'anesthésie-réanimation, Hôtel-Dieu de France, Beyrouth, Liban
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18
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Abstract
OBJECTIVE The aim of this study was to evaluate the effectiveness of bilateral ilioinguinal-iliohypogastric nerve blocks for pain relief following ambulatory bilateral varicocelectomy. STUDY DESIGN Prospective and randomised. PATIENTS AND METHODS Sixty adult men scheduled for bilateral varicocelectomy were included in this prospective study. All patients had a standardised general anesthesia. After surgical procedures, patients were randomized into two groups: patients in group I received a bilateral ilioinguinal nerve block with 15 ml x 2 of 0.25% bupivacaine; patients in group II received subcutaneously 1 mg kg-1 of tramadol. Visual analogue pain scores at rest and during mobilisation were recorded at 5 min and 1, 3, 5 postoperative hours. The side effects of analgesia and amounts of rescue analgesics were recorded. RESULTS Pain scores at rest and during mobilisation, the incidence of postoperative nausea and vomiting and additional analgesics requirement were significantly reduced in group I. There was no complication. CONCLUSION Ilioinguinal nerve block is effective in controlling pain after bilateral varicocelectomy in ambulatory surgery.
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Affiliation(s)
- A Yazigi
- Département d'anesthésie-réanimation, Hôtel-Dieu de France, Beyrouth, Liban
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19
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Riordan C, Jabbour K, Nanney LB, Shack RB. Chemical capsuiectomy in the rabbit model. Ir J Med Sci 2002. [DOI: 10.1007/bf03170050] [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: 10/20/2022]
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Abstract
This study was aimed at assessing the role of carotid body function in neuroendocrine and glucoregulatory responses to exercise. The carotid bodies and associated nerves were removed (CBR, n = 6) or left intact (Sham, n = 6) in anesthetized dogs >16 days before experiments, and infusion and sampling catheters were implanted. Conscious dogs were studied at rest and during 150 min of exercise. Isotopic dilution was used to assess glucose production (R(a)) and disappearance (R(d)). Arterial glucagon was reduced in CBR compared with Sham at rest (29 +/- 3 vs. 47 +/- 3 pg/ml). During exercise, glucagon increased more in Sham than in CBR (47 +/- 9 vs. 15 +/- 2 pg/ml). Cortisol and epinephrine levels were similar in the two groups at rest and during exercise. Basal norepinephrine was similar in CBR and Sham. During exercise, norepinephrine increased by 432 +/- 124 pg/ml in Sham, but by only 201 +/- 28 pg/ml in CBR. Basal arterial plasma glucose was 108 +/- 2 and 105 +/- 2 mg/dl in CBR and Sham, respectively. Arterial glucose dropped by 10 +/- 3 mg/dl at onset of exercise in CBR (P < 0.01) but was unchanged in Sham (decrease of 3 +/- 2 mg/dl, not significant). Basal glucose kinetics were equal in Sham and CBR. At onset of exercise, R(a) and R(d) were transiently uncoupled in CBR (i.e., R(d) > R(a)) but were closely matched in Sham. In steady-state exercise, R(a) and R(d) were closely matched in both groups. Insulin was equal in the basal period and decreased similarly during exercise. These studies suggest that input from the carotid bodies, or receptors anatomically close to them, 1) is important in control of basal glucagon and the exercise-induced increment in glucagon, 2) is involved in the sympathetic response to exercise, and 3) participates in the non-steady-state coupling of R(a) to R(d), but 4) is not essential to glucoregulation during sustained exercise.
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Affiliation(s)
- Y Koyama
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615, USA
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21
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Gresham JD, Okamura K, Williams PE, Jabbour K, Flakoll PJ. Gastrointestinal tract, hepatic, hindlimb, and renal recovery of CO(2) in vivo. J Appl Physiol (1985) 2000; 89:2000-6. [PMID: 11053355 DOI: 10.1152/jappl.2000.89.5.2000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 11/22/2022] Open
Abstract
Whole body oxidative rates of labeled substrates are often measured by collecting expired air and determining the amount of labeled CO(2) that is produced. However, the CO(2) produced may not be completely recovered under all circumstances, and there is a wide variation in values reported under different experimental conditions ( approximately 50-100%). The potential contribution of specific organs to this variation has not been defined. In vivo studies using healthy, postabsorptive, multicatheterized conscious canines were conducted to determine gastrointestinal tract, hepatic, hindlimb, and renal recoveries of NaH(14)CO(3) during a 180-min constant infusion [0.022+/-0.002 (SE) microCi x kg(-1) x min(-1)]. Before the constant infusion period, a bolus infusion of NaH(14)CO(3) (1.76+/-0.16 microCi/kg) was given, and the rate of decay in blood was measured over a 15-min period to determine pool size. The pool size for the distribution of (14)CO(2) was approximately 80% of the total body pool (16.0+/-1.7 liters). Whole body recovery was 97.2+/-6.7%. The recoveries across the liver, gut, leg, and kidney were 99.9+/-1.3, 98.0 +/-1.4, 96.7+/-2.6, and 99.9+/-2.1%, respectively. In conclusion, hepatic, gastrointestinal tract, hindlimb, and renal recoveries of CO(2) in vivo were near 100%, suggesting that CO(2) loss is not greater in gluconeogenic organs and that corrections for incomplete recovery of CO(2), when measuring oxidation of substrates across these organs under normal postabsorptive conditions, would be very minor.
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Affiliation(s)
- J D Gresham
- Departments of Surgery and Biochemistry, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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22
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Abstract
The carotid bodies are sensitive to glucose in vitro and can be stimulated to cause hyperglycemia in vivo. The aim of this study was to determine if the carotid bodies are involved in basal glucoregulation or the counterregulatory response to an insulin-induced decrement in arterial glucose in vivo. Dogs were surgically prepared >16 days before the experiment. The carotid bodies and their associated nerves were removed (carotid body resected [CBR]) or left intact (Sham), and infusion and sampling catheters were implanted. Removal of carotid bodies was verified by the absence of a ventilatory response to NaCN. Experiments were performed in 18-h fasted conscious dogs and consisted of a tracer ([3-3H]glucose) equilibration period (-120 to -40 min), a basal period (-40 to 0 min), and an insulin infusion (1 mU x kg(-1) x min(-1)) period (0-150 min) during which glucose was infused as needed to clamp at mildly hypoglycemic (65 mg/dl) or euglycemic (105 mg/dl) levels. Basal (8 microU/ml) and clamp (40 microU/ml) insulin levels were similar in both groups. Basal arterial glucagon was reduced in CBR compared with Sham (30 + 2 vs. 40 +/- 2 pg/ml) and remained reduced in CBR during hypoglycemia (peak levels of 36 +/- 3 vs. 52 +/- 7 pg/ml). Cortisol levels were not significantly different between the 2 groups in the basal state, but were reduced during the hypoglycemic clamp in CBR. Catecholamine levels were not significantly different between the 2 groups in the basal and hypoglycemic periods. The glucose infusion rate required to clamp glucose at 65 mg/dl was 2.5-fold greater in CBR compared with Sham (4.0 +/- 0.4 vs. 1.6 +/- 0.4 mg x kg(-1) x min(-1)). Basal endogenous glucose appearance (R(a)) was equal in CBR and Sham (2.5 +/- 0.1 vs. 2.5 +/- 0.2 mg x kg(-1) x min(-1)). During the hypoglycemic clamp, insulin suppressed R(a) in CBR but not Sham (1.1 +/- 0.2 vs. 2.5 +/- 0.2 mg x kg(-1) x min(-1) during the last 30 min of the clamp), reflecting impaired counterregulation. Glucose disappearance (R(d)) in the basal state was similar in CBR and Sham, whereas it was elevated in CBR during the hypoglycemic clamp (4.8 +/- 0.1 vs. 3.9 +/- 0.1 mg x kg(-1) x min(-1) during the last 30 min of the clamp). R(d) was also elevated in euglycemic clamp studies, indicating an effect of carotid body resection independent of hypoglycemia. There were no other measured systematic endocrine or metabolic effects of carotid body resection during euglycemic clamps. In conclusion, we found that the carotid bodies (or receptors anatomically close by) play an important role in the insulin-induced counterregulatory response to mild hypoglycemia.
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Affiliation(s)
- Y Koyama
- Department of Molecular Physiology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615, USA.
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Puchowicz MA, Bederman IR, Comte B, Yang D, David F, Stone E, Jabbour K, Wasserman DH, Brunengraber H. Zonation of acetate labeling across the liver: implications for studies of lipogenesis by MIDA. Am J Physiol 1999; 277:E1022-7. [PMID: 10600790 DOI: 10.1152/ajpendo.1999.277.6.e1022] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Measurement of fractional lipogenesis by mass isotopomer distribution analysis (MIDA) of fatty acids or cholesterol labeled from [(13)C]acetate assumes constant enrichment of lipogenic acetyl-CoA in all hepatocytes. This would not be the case if uptake and release of acetate by the liver resulted in transhepatic gradients of acetyl-CoA enrichment. Conscious dogs, prefitted with transhepatic catheters, were infused with glucose and [1, 2-(13)C(2)]acetate. Stable concentrations and enrichments of acetate were measured in artery (17 microM, 36%), portal vein (61 microM, 5. 4%), and hepatic vein (17 microM, 1.0%) and were computed for mixed blood entering the liver (53 microM, 7.4%). We also measured balances of propionate and butyrate across gut and liver. All gut release of propionate and butyrate is taken up by the liver. The threefold decrease in acetate concentration and the sevenfold decrease in acetate enrichment across the liver strongly suggest that the enrichment of lipogenic acetyl-CoA decreases across the liver. Thus fractional hepatic lipogenesis measured in vivo by MIDA may be underestimated.
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Affiliation(s)
- M A Puchowicz
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio 44106, USA
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24
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Geevarghese SK, Bradley AL, Atkinson J, Wright JK, Chapman WC, Van Buren DH, Blair KT, Hutchins CH, Jabbour K, Phillips J, Williams PE, Pinson CW. Comparison of arcuate-legged clipped versus sutured hepatic artery, portal vein, and bile duct anastomoses. Am Surg 1999; 65:311-6. [PMID: 10190352] [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: 02/11/2023]
Abstract
Attempts at improving anastomoses have included the development of stapling techniques. Our purpose was to evaluate arcuate-legged clipped versus standard sutured anastomoses of the hepatic artery (HA), portal vein (PV), and bile duct in a porcine liver transplantation model. Two groups of pigs were studied intraoperatively and 1 day after liver transplantation. A control group underwent sutured anastomosis of PV and HA with polypropylene and of bile duct with polydioxanone (n = 8). An experimental group underwent anastomoses with arcuate-legged clips (n = 8). We analyzed the time to perform anastomosis and flows before and at various time points after anastomosis. In addition, patency and histology of the anastomoses were evaluated 1 day after operation, including a fibrin-thrombosis score, medial injury, and inflammation score. Times to complete HA and PV anastomoses were not different between clipped and sutured groups. However, the time was shorter to complete bile duct anastomosis with clips than with sutures (6.3 +/- 1.1 minutes and 13.3 +/- 2.0 minutes, respectively). Flows through HA anastomoses were not different between groups, but flow through the PV was higher in clipped compared with sutured anastomosis (P = 0.06). Patency was 100 per cent with no leaks for all three anastomoses in both groups. Histologic data were similar between vascular anastomotic groups. Sutured bile duct anastomoses revealed mild smooth muscle injury in 75 per cent whereas clipped bile duct anastomoses displayed no smooth muscle injury. We conclude that arcuate-legged clipped anastomosis represents a viable option to sutured anastomoses of the PV, HA, and bile duct anastomoses. Bile duct anastomoses were completed in less than half the time and with less tissue damage documented histologically.
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Affiliation(s)
- S K Geevarghese
- Division of Hepatobiliary Surgery and Liver Transplantation, S.R. Light Surgical Research Laboratory, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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25
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Geevarghese SK, Flakoll P, Bradley AL, Wright JK, Chapman WC, Van Buren D, Sika M, Blair KT, Jabbour K, Williams PE, Hutchins CH, Phillips JL, Pinson CW. The effect of nutritional and hormonal supplementation on protein synthesis immediately after liver transplantation. J Surg Res 1999; 81:196-200. [PMID: 9927540 DOI: 10.1006/jsre.1998.5509] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 11/22/2022]
Abstract
We have previously shown that immediately after liver transplantation (LT) the porcine recipient exhibits elevated plasma glucagon, increased fractional synthetic rate (FSR) of fibrinogen, and decreased FSR of fixed or structural liver proteins. The purpose of this study was to evaluate the effect of nutritional and hormonal supplementation on these observations 24 h after LT. Two groups of nine pigs were studied 1 day after LT using radioisotopic and arteriovenous difference techniques. A control group underwent LT with saline infusion and a supplemented group underwent LT with infusion of glucose, amino acids (6 and 1.06 mg/kg. min, respectively), and intraportal insulin (0.6 mU/kg. min) and glucagon (1.3 ng/kg. min). Primed constant infusions of [3H]leucine were used to determine leucine flux, an estimate of whole body protein breakdown, and fractional synthetic rates (FSR). The following changes were noted with supplementation: elevated plasma insulin (6 +/- 1 versus 29 +/- 4 microU/ml, control versus supplemented, respectively, P < 0.05), decreased glucagon to normal levels (323 +/- 65 versus 102 +/- 12 pg/ml, P < 0.05), decreased fibrinogen FSR (108 +/- 15 versus 70 +/- 6%/day, P < 0.025), and increased fixed liver protein FSR (8 +/- 1 versus 13 +/- 2%/day, P < 0.05, respectively). Albumin FSR was unaltered by supplementation (8 +/- 2 versus 6 +/- 1%/day, respectively). Nutritional and hormonal supplementation immediately after LT restored the measured protein synthesis in the allograft to near normal levels 1 day after transplantation.
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Affiliation(s)
- S K Geevarghese
- Division of Hepatobiliary Surgery and Liver Transplantation and Section of Surgical Sciences, Vanderbilt University Medical Center. Nashville, TN, USA
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Borel MJ, Williams PE, Jabbour K, Levenhagen D, Kaizer E, Flakoll PJ. Parenteral glutamine infusion alters insulin-mediated glucose metabolism. JPEN J Parenter Enteral Nutr 1998; 22:280-5. [PMID: 9739030 DOI: 10.1177/0148607198022005280] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [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: 11/16/2022]
Abstract
BACKGROUND Glutamine is a conditionally essential amino acid that is critical for many basic cellular processes. Its supplementation has been found to be beneficial during several critical illnesses. This study examines the effects of increased glutamine availability on insulin-mediated glucose homeostasis in vivo in multicatheterized conscious canines (n = 5). METHODS Two weeks before the study, catheters were placed in the femoral artery and the portal, hepatic, femoral, and renal veins for blood sampling and in the splenic vein for intraportal infusion of insulin and glucagon. Doppler probes were placed to measure blood flow. The metabolic study consisted of equilibration, basal, and experimental periods during which [3-3H]glucose was infused to measure glucose kinetics. During the 5-hour experimental period, a hyperinsulinemic-euglycemic clamp was performed by infusing somatostatin, basal glucagon, fivefold basal insulin, and glucose to maintain euglycemia. The experimental period was divided evenly into two subperiods performed in random order: (1) i.v. glutamine infusion (0.72 mmol kg(-1) h(-1)) and (2) i.v. saline infusion. RESULTS With glutamine, the glucose required to maintain euglycemia was increased 46% over saline (6.8 +/- 1.0 to 9.9 +/- 1.7 mg kg(-1) min(-1). In addition, whole-body glucose production and utilization were increased by 1.4 and 4.6 mg kg(-1) min(-1), respectively. Finally, the increase in whole-body glucose utilization was manifested by increased hepatic and hindlimb glucose utilization. CONCLUSIONS Increased glutamine availability blunted insulin's action on glucose production and enhanced insulin-mediated glucose utilization with the changes in utilization being threefold greater than the changes in production. Thus parenteral glutamine has potential benefit as a nutrient adjuvant during clinical situations associated with insulin resistance.
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Affiliation(s)
- M J Borel
- Department of Surgery, Vanderbilt Universtiy Medical Center, Nashville, Tennesse 37232, USA
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Bradley AL, Sika M, Becker YT, Blair KT, Jabbour K, Williams PE, Phillips J, Chapman WC, Wright JK, Flakoll PJ, Pinson CW. Net hepatic glucose output is normal on postoperative day 1 after liver transplantation. Am Surg 1998; 64:255-8. [PMID: 9520818] [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: 02/06/2023]
Abstract
The liver plays a central role in carbohydrate metabolism and glucose homeostasis; therefore, the rapid recovery of glucose homeostasis after liver transplantation (LT) is important. The purpose of this study was to evaluate hepatic and whole-body glucose production (WBGP) on postoperative day 1 after LT using a combination of arteriovenous differences and radioisotope techniques. Two groups of female commercially bred pigs with an average body weight of 31.9 +/- 1.4 kg were studied. A control group (n = 6) underwent laparotomy. A transplanted group (n = 6) was submitted to LT. All pigs were instrumented with catheters placed in the carotid artery and the hepatic, portal, and jugular vein, and flow probes were placed around the hepatic artery and portal vein. WBGP was measured by a primed constant infusion of 3-[3H]glucose 1 day postoperatively. Plasma glucose was 89 +/- 6 versus 98 +/- 7 mg/dL in the control and transplanted groups, respectively. WBGP was increased by 42 per cent in the transplanted group (2.54 +/- 0.17 vs 3.62 +/- 0.39 mg/kg.min), but the net hepatic glucose output was not different between the control and the transplanted groups (1.53 +/- 0.28 vs 1.68 +/- 0.31 mg/kg.min). These results demonstrate that net hepatic glucose output was not different between the control and transplanted pigs, suggesting that LT does not compromise the ability of the liver to produce glucose. However, the WBGP was increased by 42 per cent in the transplanted group, suggesting either a significant contribution from another organ or a significant intrahepatic utilization of glucose.
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Affiliation(s)
- A L Bradley
- Division of Hepatobiliary Surgery and Liver Transplantation, Vanderbilt University Medical Center, Nashville, TN 37232-4753, USA
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Bradley AL, Sika M, Wright JK, Chapman WC, Blair KT, Jabbour K, Williams PE, Donovan KL, Van Buren DH, Flakoll PJ, Pinson CW. Hepatic uptake of amino acids immediately after liver transplantation is well preserved despite altered plasma profiles. J Surg Res 1998; 74:47-53. [PMID: 9536973 DOI: 10.1006/jsre.1997.5225] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND The liver is one of the principal organs responsible for the uptake and release of amino acids in the body. The ability of the transplanted liver to clear plasma amino acids is associated with a functioning allograft. However, clinical assessment is limited by the inability to access the portal vein postoperatively. Therefore, using a porcine liver transplant model, we examined (1) the plasma levels of amino acids presented to the new hepatic allograft and (2) the capacity of the new allograft to clear these amino acids from the circulation. MATERIALS AND METHODS Two groups of commercially bred pigs were studied: a control group (n = 8) underwent laparotomy and a transplanted group (n = 6) underwent orthotopic liver transplantation (LT) using veno-venous bypass. All pigs had catheters placed in the carotid artery and portal and hepatic veins and ultrasonic transit time flow probes placed around the hepatic artery and portal vein. Plasma profiles of 23 amino acids were analyzed by high-pressure liquid chromatography. Hepatic balances of amino acids, using arteriovenous difference techniques coupled with hepatic blood flows, were also analyzed on postoperative day 1. RESULTS Neither portal vein blood flow (703 +/- 74 ml/min vs 666 +/- 82 ml/min) nor hepatic artery blood flow (322 +/- 43 ml/min vs 209 +/- 59 ml/min) was significantly different between the control and the transplanted groups, respectively. The transplanted group had significantly increased plasma levels of alanine (135 +/- 13 mumol/l vs 382 +/- 72 mumol/l), hydroxyproline (30 +/- 5 mumol/l vs 60 +/- 9 mumol/l), methionine (25 +/- 2 mumol/l vs 55 +/- 10 mumol/l), ornithine (36 +/- 5 mumol/l vs 141 +/- 33 mumol/l), phenylalanine (84 +/- 5 mumol/l vs 120 +/- 12 mumol/l), threonine (75 +/- 9 mumol/l vs 159 +/- 27 mumol/l), and tryptophan (17 +/- 2 mumol/l vs 31 +/- 4 mumol/l). The transplanted group also had significantly decreased plasma levels of isoleucine (122 +/- 12 mumol/l vs 85 +/- 8 mumol/l) and taurine (71 +/- 7 mumol/l vs 35 +/- 7 mumol/l). These individual amino acid changes were not accompanied by impairment in the net hepatic amino acid balance or the hepatic fractional extraction of amino acids between the two groups. CONCLUSION These results suggest that the circumstances associated with liver transplantation alter the fasting amino acid profile immediately postoperatively. However, liver transplantation does not impair the normal hepatic allograft uptake of most plasma amino acids. Thus, the changes observed in the circulating levels of amino acids may represent alterations in nonhepatic production and/or utilization. Furthermore, altered plasma amino acid profiles following liver transplantation are not necessarily indicative of impaired hepatic allograft amino acid metabolism.
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Affiliation(s)
- A L Bradley
- Division of Hepatobiliary Surgery and Liver Transplantation, Veterans Affairs Medical Center, Nashville, Tennessee, USA
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Sika M, Blair KT, Jabbour K, Williams PE, Donovan KL, Drougas JG, Becker YT, Bradley AL, Van Buren DH, Flakoll PJ, Chapman WC, Wright JK, Pinson CW. Mechanisms of hyperinsulinemia and hyperglucagonemia after liver transplantation. J Surg Res 1997; 70:144-50. [PMID: 9245563 DOI: 10.1006/jsre.1997.5119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [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: 02/04/2023]
Abstract
These studies were undertaken to evaluate the mechanisms for changes in plasma insulin and glucagon levels observed post-liver transplantation. Two groups of pigs were studied: a control group (n = 8) underwent laparotomy and catheter placement in the carotid artery and portal and hepatic veins. Hepatic blood flow was measured by ultrasonic flow probes placed around the hepatic artery and portal vein. An experimental group (n = 8) underwent orthotopic liver transplantation and similar instrumentation. On Day 1 after surgery, an estimate of insulin and glucagon secretion and hepatic extraction was determined using arteriovenous difference techniques. Serum assays were performed for markers of hepatic and renal function. Plasma insulin levels of the transplanted pigs were higher in the carotid artery (4 +/- 1 microU/ml vs 7 +/- 1 microU/ml), but not in the hepatic vein (5 +/- 1 microU/ml vs 7 +/- 1 microU/ml) and in the portal vein (10 +/- 2 microU/ml vs 12 +/- 2 microU/ml). Arterial plasma C-peptide was significantly greater in the transplanted group (0.23 +/- 0.02 ng/ml vs 0.42 +/- 0.03 ng/ml); however, the molar ratio of C-peptide and insulin was not different between the two groups (3.6 +/- 0.9 vs 3.4 +/- 0.4). Plasma glucagon levels of the transplanted pigs were significantly elevated in the carotid artery (111 +/- 11 pg/ml vs 323 +/- 65 pg/ml), portal vein (221 +/- 27 pg/ml vs 495 +/- 69 pg/ml), and hepatic vein (142 +/- 15 pg/ml vs 395 +/- 58 pg/ml). The estimate of pancreatic secretion of insulin (115 +/- 28 microU/kg.min) vs 71 +/- 21 microU/kg.min) and glucagon (2.0 +/- 0.4 ng/kg.min vs 2.7 +/- 0.7 ng/kg.min) and the fractional hepatic extraction rate of insulin (35 +/- 8% vs 32 +/- 5%) were not different between the two groups. However, the hepatic fractional extraction rate of glucagon was significantly decreased in the transplanted group (25 +/- 5% vs 11 +/- 3%). Therefore, the hyperglucagonemia observed 24 hr following liver transplantation is partly due to reduced hepatic fractional extraction of glucagon while the hyperinsulinemia is mainly due to the nonhepatic clearance of insulin. We speculate that decreased renal function may contribute to the hyperinsulinemia, elevated C-peptide concentrations, and hyperglucagonemia.
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Affiliation(s)
- M Sika
- Department of Surgery, Veterans Affairs Medical Center, Nashville, Tennessee, USA
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Borel MJ, Williams PE, Jabbour K, Hibbard JC, Flakoll PJ. Maintaining muscle protein anabolism after a metabolic stress: role of dextrose vs. amino acid availability. Am J Physiol 1997; 272:E36-44. [PMID: 9038849 DOI: 10.1152/ajpendo.1997.272.1.e36] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The effect of chronic hypocaloric parenteral infusions of amino acids (AA) vs. dextrose (D) on protein homeostasis after a generalized metabolic stress was examined. Multicatheterized mongrel dogs were metabolically challenged by a 4-day fast and then administered a 4-day intravenous infusion of saline (S, n = 8), D (n = 8), or isocaloric AA (n = 7). Although nitrogen balance (g.kg.1.day-1) was similarly negative with S (-0.37 +/- 0.05), D (-0.28 +/- 0.03), and AA (-0.37 +/- 0.04) during the fasting period, it was less negative (P < or = 0.05) with AA (-0.06 +/- 0.04) than with D (-0.20 +/- 0.03) or S (-0.23 +/- 0.04) during nutrient infusion. AA resulted in net hindlimb uptake and D in net hindlimb release of essential AA (570 +/- 261 vs. -248 +/- 59 nmol.kg-1.min-1). Whereas S and D infusions led to net hindlimb muscle protein loss (-37 +/- 24 and -89 +/- 33 micrograms.kg-1.min-1, respectively, P < or = 0.05 vs. AA), parenteral AA resulted in net deposition (169 +/- 62 micrograms.kg-1.min-1) as measured using L-[ring-2H5]phenylalanine. Thus hypocaloric parenteral D infusion after a metabolic stress does not favor nitrogen conservation, because net whole body nitrogen loss, skeletal muscle protein catabolism, and hindlimb AA release were not blunted compared with S infusion. Conversely, hypocaloric AA infusion preserves whole body and muscle protein stores.
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Affiliation(s)
- M J Borel
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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Molina PE, Jabbour K, Williams P, Abumrad NN. Effect of acute ethanol intoxication on glucoregulation during prolonged insulin-induced hypoglycemia. Am J Physiol 1994; 267:R1280-7. [PMID: 7977855 DOI: 10.1152/ajpregu.1994.267.5.r1280] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This study examined the interaction of acute ethanol administration on glucose homeostasis during insulin-induced hypoglycemia (IIH). Glucose kinetics and net hepatic balances of alanine, glycerol, and lactate were estimated in three groups of dogs: group I underwent 3 h of IIH; group II received a continuous ethanol infusion in addition to IIH; group III received ethanol for 3 h. In group I, IIH resulted in a sustained twofold increase in glucose rate of appearance (Ra) and net hepatic uptake (NHU) of glycerol and lactate but no change in NHU of alanine. In group II, glucose Ra rose transiently, NHU of alanine and glycerol increased two- and fivefold, respectively, whereas NHU of lactate dropped 60%. In group III, no alterations in plasma glucose levels, glucose Ra, and NHU of alanine and glycerol were observed, but NHU of lactate switched to a net output. These results demonstrate that ethanol alone or with IIH exclusively inhibited NHU of lactate, and this was responsible, in a stoichiometric fashion, for the failure of the delayed increase in glucose Ra during IIH.
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Affiliation(s)
- P E Molina
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232
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Simaan JA, Fawaz G, Jabbour K. Comparison of the cardiodynamic and metabolic effects of dobutamine with those of norepinephrine and dopamine in the dog isolated heart. Naunyn Schmiedebergs Arch Pharmacol 1988; 338:174-9. [PMID: 3185745 DOI: 10.1007/bf00174866] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A comparative study of the cardiodynamic and metabolic effects of norepinephrine, dopamine and dobutamine was carried out on the isolated heart-lung preparation from dogs, modified to measure coronary outflow and myocardial oxygen consumption. Infusions of the three sympathomimetic drugs which increased myocardial contractility, as reflected by maximal rate of rise of left ventricular pressure, dp/dt, by 24%, produced comparable increases in heart rate of 5 to 7% with the three drugs, comparable increases in myocardial oxygen consumption of 11% with dopamine and 19% with dobutamine and a decrease in mechanical efficiency of 13% with dobutamine. At higher doses which increased dp/dt by an average of 68%, heart rate increased by 9%, 19% and 26% following norepinephrine, dopamine and dobutamine, respectively, the increase produced by dobutamine being significantly higher than that produced by norepinephrine. Myocardial oxygen consumption increased significantly following dopamine by 39% and dobutamine by 46% but not following norepinephrine. Mechanical efficiency decreased following dobutamine by 24%. At average increases in dp/dt of 123% and 166%, there were further increases in heart rate and myocardial oxygen consumption and decreases in mechanical efficiency, the changes in each parameter being similar for all three drugs. The increase in coronary outflow was compared with the spontaneous increase which is regularly observed with time in the isolated heart-lung preparation. Only dobutamine was found to increase coronary outflow by 49%, 117% and 137% at increases in dp/dt of 71%, 118% and 173%, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J A Simaan
- Department of Pharmacology and Therapeutics, Faculty of Medicine, American University of Beirut, Lebanon
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