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Mohamed SY, Monge-Palacios M, Giri BR, Khaled F, Liu D, Farooq A, Sarathy SM. The Effect of Hydrogen Bonding on the Reactivity of OH Radicals with Prenol and Isoprenol: A Shock Tube and Multi-Structural Torsional Variational Transition State Theory Study. Phys Chem Chem Phys 2022; 24:12601-12620. [DOI: 10.1039/d2cp00737a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The presence of two functional groups (OH and double bond) in C5 methyl-substituted enols (i.e., isopentenols), such as 3-methyl-2-buten-1-ol (prenol) and 3-methyl-3-buten-1-ol (isoprenol), makes them excellent biofuel candidates as fuel...
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Elsherbiny EA, Taher MA, Abd El-Aziz MH, Mohamed SY. Action mechanisms and biocontrol of Purpureocillium lilacinum against green mould caused by Penicillium digitatum in orange fruit. J Appl Microbiol 2021; 131:1378-1390. [PMID: 33484589 DOI: 10.1111/jam.15016] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 01/14/2023]
Abstract
AIMS The present study evaluated, for the first time, the inhibitory effects of the filtrate of Purpureocillium lilacinum against Penicillium digitatum. METHODS AND RESULTS No direct contact between P. lilacinum and P. digitatum was observed during the dual culture test and the inhibition zone was 6·1 mm. The filtrate of P. lilacinum completely inhibited P. digitatum growth and spore germination at the concentration of 64%. The filtrate increased the permeability of the cell membrane and the content of MDA in P. digitatum. The ergosterol content in P. digitatum was strongly inhibited at 32% by 81·1%. The green mould incidence and severity in filtrate-treated fruit at 64% were 71·7 and 80·7% lower than in the control, respectively. The filtrate enhanced the activity of PAL, PPO and POD enzymes in orange fruit. The POD and PAL gene expression levels were significantly upregulated in the fruit treated with the filtrate. CONCLUSIONS This study indicated that the antifungal mechanism of P. lilacinum filtrate against P. digitatum is mainly by the damage of the fungal cell membrane and its components. SIGNIFICANCE AND IMPACT OF THE STUDY This work provides the pioneer evidence on the application of P. lilacinum filtrate as a novel biocontrol agent for orange green mould.
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Affiliation(s)
- E A Elsherbiny
- Plant Pathology Department, Faculty of Agriculture, Mansoura University, Mansoura, Egypt
| | - M A Taher
- Agricultural Chemistry Department, Faculty of Agriculture, Mansoura University, Mansoura, Egypt
| | - M H Abd El-Aziz
- Department of Genetics, Faculty of Agriculture, Mansoura University, Mansoura, Egypt
| | - S Y Mohamed
- Horticulture Research Institute, Agricultural Research Center, Cairo, Egypt
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Mohamed SY, Davis AC, Al Rashidi MJ, Sarathy SM. Computational Kinetics of Hydroperoxybutylperoxy Isomerizations and Decompositions: A Study of the Effect of Hydrogen Bonding. J Phys Chem A 2018; 122:6277-6291. [DOI: 10.1021/acs.jpca.8b04415] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Samah Y. Mohamed
- King Abdullah University of Science and Technology, Clean Combustion Research Center, Thuwal, 23955-6900, Saudi Arabia
| | - Alexander C. Davis
- Franklin and Marshall College, Lancaster, Pennsylvania 17604-3003, United States
| | | | - S. Mani Sarathy
- King Abdullah University of Science and Technology, Clean Combustion Research Center, Thuwal, 23955-6900, Saudi Arabia
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Affiliation(s)
- Samah Y. Mohamed
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Alexander C. Davis
- Franklin and Marshall College, Lancaster, Pennsylvania 17604-3003, United States
| | | | - S. Mani Sarathy
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
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Wang Z, Popolan-Vaida DM, Chen B, Moshammer K, Mohamed SY, Wang H, Sioud S, Raji MA, Kohse-Höinghaus K, Hansen N, Dagaut P, Leone SR, Sarathy SM. Unraveling the structure and chemical mechanisms of highly oxygenated intermediates in oxidation of organic compounds. Proc Natl Acad Sci U S A 2017; 114:13102-13107. [PMID: 29183984 PMCID: PMC5740676 DOI: 10.1073/pnas.1707564114] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [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] [Indexed: 11/18/2022] Open
Abstract
Decades of research on the autooxidation of organic compounds have provided fundamental and practical insights into these processes; however, the structure of many key autooxidation intermediates and the reactions leading to their formation still remain unclear. This work provides additional experimental evidence that highly oxygenated intermediates with one or more hydroperoxy groups are prevalent in the autooxidation of various oxygenated (e.g., alcohol, aldehyde, keto compounds, ether, and ester) and nonoxygenated (e.g., normal alkane, branched alkane, and cycloalkane) organic compounds. These findings improve our understanding of autooxidation reaction mechanisms that are routinely used to predict fuel ignition and oxidative stability of liquid hydrocarbons, while also providing insights relevant to the formation mechanisms of tropospheric aerosol building blocks. The direct observation of highly oxygenated intermediates for the autooxidation of alkanes at 500-600 K builds upon prior observations made in atmospheric conditions for the autooxidation of terpenes and other unsaturated hydrocarbons; it shows that highly oxygenated intermediates are stable at conditions above room temperature. These results further reveal that highly oxygenated intermediates are not only accessible by chemical activation but also by thermal activation. Theoretical calculations on H-atom migration reactions are presented to rationalize the relationship between the organic compound's molecular structure (n-alkane, branched alkane, and cycloalkane) and its propensity to produce highly oxygenated intermediates via extensive autooxidation of hydroperoxyalkylperoxy radicals. Finally, detailed chemical kinetic simulations demonstrate the influence of these additional reaction pathways on the ignition of practical fuels.
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Affiliation(s)
- Zhandong Wang
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;
| | - Denisia M Popolan-Vaida
- Department of Chemistry, University of California, Berkeley, CA 94720
- Department of Physics, University of California, Berkeley, CA 94720
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
- Department of Chemistry, University of Central Florida, Orlando, FL 32816-2450
| | - Bingjie Chen
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Kai Moshammer
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
| | - Samah Y Mohamed
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Heng Wang
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Salim Sioud
- Analytical Core Laboratory, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Misjudeen A Raji
- Analytical Core Laboratory, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | | | - Nils Hansen
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551
| | - Philippe Dagaut
- CNRS, Institut National des Sciences de l'Ingénierie et des Systèmes, Institut de Combustion, Aérothermique, Réactivité et Environnement, 45071, Orléans, Cedex 2, France
| | - Stephen R Leone
- Department of Chemistry, University of California, Berkeley, CA 94720
- Department of Physics, University of California, Berkeley, CA 94720
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - S Mani Sarathy
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;
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Owaidah T, Momen AA, Alzahrani H, Almusa A, Alkasim F, Tarawah A, Nouno RA, Batniji FA, Alothman F, Alomari A, Abu-Herbish S, Abu-Riash M, Siddiqui K, Ahmed M, Mohamed SY, Saleh M. The prevalence of factor VIII and IX inhibitors among Saudi patients with hemophilia: Results from the Saudi national hemophilia screening program. Medicine (Baltimore) 2017; 96:e5456. [PMID: 28079788 PMCID: PMC5266150 DOI: 10.1097/md.0000000000005456] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Hemophilia A and B are X-linked diseases that predominantly affect male patients. Patients can develop coagulation factor inhibitors, which exponentially increases the treatment cost. However, the prevalence of factor VIII and IX inhibitors in Saudi Arabia is unclear.This study aimed to determine the Saudi prevalence of factor VIII and IX inhibitors.This 4-year, 7-center, cross-sectional study evaluated the Saudi prevalences of hemophilia A and B. We collected the patients' clinical data, evaluated their disease, and tested for factor inhibitors.We included 202 patients with hemophilia (median age at diagnosis: 0.13 years, range: birth-34.8 years). The patients included 198 male patients (98%), 148 patients with hemophilia A (73.3%), and 54 patients with hemophilia B (26.7%). The patients exhibited severe factor VIII activity (<1%; 121 patients; 5.2%), moderate activity (1-5%; 7 patients; 4.9%), and mild activity (14 patients; 9.9%). Among the patients with care-related data, most patients were treated for episodic bleeding (76.8%) or received prophylaxis (22.6%); 1 patient received both treatments. Among the patients with source-related data, the factor replacements were derived from plasma (48.4%), recombinant concentrates (22.9%), both sources (14.6%), or fresh frozen plasma (14.1%). Factor VIII inhibitors were observed in 43 (29.3%) of the 147 patients, and only 1 of the 54 patients developed factor IX inhibitors. Most patients who developed inhibitors had severe hemophilia (40/44; 90.9%), and inhibitors were also common among patients who received recombinant products (14/43; 32.6%).The Saudi prevalence of factor inhibitors was similar to those among other ethnic populations.
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Affiliation(s)
- Tarek Owaidah
- Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Center
- Center of Excellence in Thrombosis and Hemostasis, King Saud University
| | | | | | - Abdulrahman Almusa
- Department of Pediatric Hematology, King Faisal Specialist Hospital and Research Center
| | - Fawaz Alkasim
- Department of Pediatric Hematology, Ministry of Health, Riyadh
| | - Ahmed Tarawah
- Department of Pediatric Hematology, Ministry of Health, Medina
| | - Randa Al Nouno
- Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Center
| | | | - Fahad Alothman
- Department of Pediatric Hematology, Security Force Hospital
| | - Ali Alomari
- Department of Pediatric Hematology, National Guard Hospital
| | - Saud Abu-Herbish
- Department of Oncology, Security Forces Hospital, Riyadh, Saudi Arabia
| | | | - Khawar Siddiqui
- Department of Pediatric Hematology, King Faisal Specialist Hospital and Research Center
| | - Mansor Ahmed
- Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Center
| | | | - Mahasen Saleh
- Department of Pediatric Hematology, King Faisal Specialist Hospital and Research Center
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Mohamed SY, Cai L, Khaled F, Banyon C, Wang Z, Al Rashidi MJ, Pitsch H, Curran HJ, Farooq A, Sarathy SM. Modeling Ignition of a Heptane Isomer: Improved Thermodynamics, Reaction Pathways, Kinetics, and Rate Rule Optimizations for 2-Methylhexane. J Phys Chem A 2016; 120:2201-17. [PMID: 26998618 DOI: 10.1021/acs.jpca.6b00907] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Accurate chemical kinetic combustion models of lightly branched alkanes (e.g., 2-methylalkanes) are important to investigate the combustion behavior of real fuels. Improving the fidelity of existing kinetic models is a necessity, as new experiments and advanced theories show inaccuracies in certain portions of the models. This study focuses on updating thermodynamic data and the kinetic reaction mechanism for a gasoline surrogate component, 2-methylhexane, based on recently published thermodynamic group values and rate rules derived from quantum calculations and experiments. Alternative pathways for the isomerization of peroxy-alkylhydroperoxide (OOQOOH) radicals are also investigated. The effects of these updates are compared against new high-pressure shock tube and rapid compression machine ignition delay measurements. It is shown that rate constant modifications are required to improve agreement between kinetic modeling simulations and experimental data. We further demonstrate the ability to optimize the kinetic model using both manual and automated techniques for rate parameter tunings to improve agreement with the measured ignition delay time data. Finally, additional low temperature chain branching reaction pathways are shown to improve the model's performance. The present approach to model development provides better performance across extended operating conditions while also strengthening the fundamental basis of the model.
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Affiliation(s)
- Samah Y Mohamed
- Clean Combustion Research Center, King Abdullah University of Science and Technology , Thuwal, 23955-6900, Saudi Arabia
| | - Liming Cai
- Institute for Combustion Technology, RWTH Aachen University , 52062 Aachen, Germany
| | - Fethi Khaled
- Clean Combustion Research Center, King Abdullah University of Science and Technology , Thuwal, 23955-6900, Saudi Arabia
| | - Colin Banyon
- Combustion Chemistry Centre, Ryan Institute, School of Chemistry, National University of Ireland , Galway, Ireland
| | - Zhandong Wang
- Clean Combustion Research Center, King Abdullah University of Science and Technology , Thuwal, 23955-6900, Saudi Arabia
| | - Mariam J Al Rashidi
- Clean Combustion Research Center, King Abdullah University of Science and Technology , Thuwal, 23955-6900, Saudi Arabia
| | - Heinz Pitsch
- Institute for Combustion Technology, RWTH Aachen University , 52062 Aachen, Germany
| | - Henry J Curran
- Combustion Chemistry Centre, Ryan Institute, School of Chemistry, National University of Ireland , Galway, Ireland
| | - Aamir Farooq
- Clean Combustion Research Center, King Abdullah University of Science and Technology , Thuwal, 23955-6900, Saudi Arabia
| | - S Mani Sarathy
- Clean Combustion Research Center, King Abdullah University of Science and Technology , Thuwal, 23955-6900, Saudi Arabia
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Ayas M, Nassar A, Hamidieh AA, Kharfan-Dabaja M, Othman TB, Elhaddad A, Seraihy A, Hussain F, Alimoghaddam K, Ladeb S, Fahmy O, Bazarbachi A, Mohamed SY, Bakr M, Korthof E, Aljurf M, Ghavamzadeh A. Reduced intensity conditioning is effective for hematopoietic SCT in dyskeratosis congenita-related BM failure. Bone Marrow Transplant 2013; 48:1168-72. [PMID: 23542225 DOI: 10.1038/bmt.2013.35] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 12/04/2012] [Accepted: 01/30/2013] [Indexed: 02/08/2023]
Abstract
BM failure (BMF) is a major and frequent complication of dyskeratosis congenita (DKC). Allogeneic hematopoietic SCT (allo-HSCT) represents the only curative treatment for BMF associated with this condition. Transplant-related morbidity/mortality is common especially after myeloablative conditioning regimens. Herein, we report nine cases of patients with DKC who received an allo-SCT at five different member centers within the Eastern Mediterranean Blood and Marrow Transplantation Registry. Between October 1992 and February 2011, nine DKC patients (male, 7 and female, 2), with a median age at transplantation of 19.1 (4.9-31.1) years, underwent an allo-HSCT from HLA-matched, morphologically normal-related donors (100%). Preparative regimens varied according to different centers, but was reduced intensity conditioning (RIC) in eight patients. Graft source was unstimulated BM in five cases (56%) and G-CSF-mobilized PBSCs in four (44%) cases. The median stem cell dose was 6.79 (2.06-12.4) × 10(6) cells/kg body weight. GVHD prophylaxis consisted of CsA in all nine cases; MTX or mycophenolate mofetil were added in five (56%) and two (22%) cases, respectively. Anti-thymocyte globulin was administered at various doses and scheduled in four (44%) cases. Median time-to-neutrophil engraftment was 21 (17-27) days. In one case, late graft failure was noted at 10.4 months post allo-HSCT. Only one patient developed grade II acute GVHD (11%). Extensive chronic GVHD was reported in one case, whereas limited chronic GVHD occurred in another four cases. At a median follow-up of 61 (0.8-212) months, seven (78%) patients were still alive and transfusion independent. One patient died of metastatic gastric adenocarcinoma and graft failure was the cause of death in another patient. This study suggests that RIC preparative regimens are successful in inducing hematopoietic cell engraftment in patients with BMF from DKC. Owing to the limited sample size, the use of registry data and heterogeneity of preparative as well as GVHD prophylaxis regimens reported in this series, we are unable to recommend a particular regimen to be considered as the standard for patients with this disease.
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Affiliation(s)
- M Ayas
- Adult Hematopoietic Stem Cell Transplantation Program, Oncology Centre, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
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Abdelbadie A, Mustafa RA, Omer H, Abdalla SM, Mohamed SY. HER2 Over Expression in Malignant Palpable Breast Lumps of Pre and Postmenopausal Women Attending RICK. Sud Jnl Med Sci 2011. [DOI: 10.4314/sjms.v5i4.64493] [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: 11/17/2022] Open
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