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An R, Lee JA. CAMDLES: CFD-DEM Simulation of Microbial Communities in Spaceflight and Artificial Microgravity. Life (Basel) 2022; 12:life12050660. [PMID: 35629329 PMCID: PMC9144607 DOI: 10.3390/life12050660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 04/18/2022] [Accepted: 04/22/2022] [Indexed: 12/02/2022] Open
Abstract
We present CAMDLES (CFD-DEM Artificial Microgravity Developments for Living Ecosystem Simulation), an extension of CFDEM®Coupling to model biological flows, growth, and mass transfer in artificial microgravity devices. For microbes that accompany humans into space, microgravity-induced alterations in the fluid environment are likely to be a major factor in the microbial experience of spaceflight. Computational modeling is needed to investigate how well ground-based microgravity simulation methods replicate that experience. CAMDLES incorporates agent-based modeling to study inter-species metabolite transport within microbial communities in rotating wall vessel bioreactors (RWVs). Preexisting CFD modeling of RWVs has not yet incorporated growth; CAMDLES employs the simultaneous modeling of biological, chemical, and mechanical processes in a micro-scale rotating reference frame environment. Simulation mass transfer calculations were correlated with Monod dynamic parameters to predict relative growth rates between artificial microgravity, spaceflight microgravity, and 1 g conditions. By simulating a microbial model community of metabolically cooperative strains of Escherichia coli and Salmonella enterica, we found that the greatest difference between microgravity and an RWV or 1 g gravity was when species colocalized in dense aggregates. We also investigated the influence of other features of the system on growth, such as spatial distribution, product yields, and diffusivity. Our simulation provides a basis for future laboratory experiments using this community for investigation in artificial microgravity and spaceflight microgravity. More broadly, our development of these models creates a framework for novel hypothesis generation and design of biological experiments with RWVs, coupling the effects of RWV size, rotation rate, and mass transport directly to bacterial growth in microbial communities.
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Affiliation(s)
- Rocky An
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14850, USA
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14850, USA
- Correspondence: (R.A.); (J.A.L.)
| | - Jessica Audrey Lee
- Space Biosciences Division, NASA Ames Research Center, Moffett Field, CA 94035, USA
- Correspondence: (R.A.); (J.A.L.)
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Tyunina EY, Tarasova GN, Dunaeva VV. Studying the Interaction between L-Methionine and Picolinic and Nicotinic Acids by Means of Densimetry and Quantum Chemistry. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024422010253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Adam AMA, Refat MS. A comparison of charge-transfer complexes of iodine with some antibiotics formed through two different approaches (liquid-liquid vs solid-solid). J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115560] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Adam AMA, Altalhi TA, Saad HA, Alsuhaibani AM, Refat MS, Hegab MS. Charge-transfer interaction of aspartame and neotame with several π-acceptors: Stoichiometric data. Data Brief 2021; 36:107092. [PMID: 34026986 PMCID: PMC8120938 DOI: 10.1016/j.dib.2021.107092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/16/2021] [Accepted: 04/16/2021] [Indexed: 11/18/2022] Open
Abstract
This data article is related to a research paper entitled ``Correlations between spectroscopic data for charge-transfer complexes of two artificial sweeteners, aspartame and neotame, generated with several π-acceptors'' [J. Mol. Liq. 333 (2021) 115904] [1]. Herein we present stoichiometric data of charge-transfer (CT) complexes generated from the interaction between aspartame and neotame with three π-acceptors in methanol solvent at room temperature. The investigated π-acceptors were picric acid (PA), chloranilic acid (CA), and 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), where the methods used to determine the stoichiometry of the CT interaction were the spectrophotometric titration method and the Job's continuous variation method.
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Affiliation(s)
- Abdel Majid A Adam
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Tariq A Altalhi
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Hosam A Saad
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Amnah M Alsuhaibani
- Department of Physical Sport Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Moamen S Refat
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohamed S Hegab
- Deanship of Supportive Studies (D.S.S.), Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
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Adam AMA, Saad HA, Alsuhaibani AM, Refat MS, Hegab MS. Charge-transfer chemistry of azithromycin, the antibiotic used worldwide to treat the coronavirus disease (COVID-19). Part II: Complexation with several π-acceptors (PA, CLA, CHL). J Mol Liq 2021; 325:115121. [PMID: 33518854 PMCID: PMC7837197 DOI: 10.1016/j.molliq.2020.115121] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/10/2020] [Accepted: 12/17/2020] [Indexed: 12/27/2022]
Abstract
Finding a vaccine or cure for the coronavirus disease (COVID-19) responsible for the worldwide pandemic and its economic, medical, and psychological burdens is one of the most pressing issues presently facing the global community. One of the current treatment protocols involves the antibiotic azithromycin (AZM) alone or in combination with other compounds. Obtaining additional insight into the charge-transfer (CT) chemistry of this antibiotic could help researchers and clinicians to improve such treatment protocols. Toward this aim, we investigated the CT interactions between AZM and three π-acceptors: picric acid (PA), chloranilic acid (CLA), and chloranil (CHL) in MeOH solvent. AZM formed colored products at a 1:1 stoichiometry with the acceptors through intermolecular hydrogen bonding. An n → π* interaction was also proposed for the AZM-CHL CT product. The synthesized CT products had markedly different morphologies from the free reactants, exhibiting a semi-crystalline structure composed of spherical particles with diameters ranging from 50 to 90 nm.
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Affiliation(s)
- Abdel Majid A Adam
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Hosam A Saad
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Amnah M Alsuhaibani
- Department of Physical Sport Science, Princess Nourah bint Abdulrahman University, 4545 - King Khalid Airport Unit No. 1, Riyadh 13415-7132, Saudi Arabia
| | - Moamen S Refat
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohamed S Hegab
- Deanship of Supportive Studies (D.S.S.), Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
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Adam AMA, Saad HA, Alsuhaibani AM, Refat MS, Hegab MS. Charge-transfer chemistry of azithromycin, the antibiotic used worldwide to treat the coronavirus disease (COVID-19). Part I: Complexation with iodine in different solvents. J Mol Liq 2021; 325:115187. [PMID: 33390633 PMCID: PMC7764390 DOI: 10.1016/j.molliq.2020.115187] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/14/2020] [Accepted: 12/22/2020] [Indexed: 12/24/2022]
Abstract
Around the world, the antibiotic azithromycin (AZM) is currently being used to treat the coronavirus disease (COVID-19) in conjunction with hydroxychloroquine or chloroquine. Investigating the chemical and physical properties of compounds used alone or in combination to combat the COVID-19 pandemic is of vital and pressing importance. The purpose of this study was to characterize the charge transfer (CT) complexation of AZM with iodine in four different solvents: CH2Cl2, CHCl3, CCl4, and C6H5Cl. AZM reacted with iodine at a 1:1 M ratio (AZM to I2) in the CHCl3 solvent and a 1:2 M ratio in the other three solvents, as evidenced by data obtained from an elemental analysis of the solid CT products and spectrophotometric titration and Job's continuous variation method for the soluble CT products. Data obtained from UV-visible and Raman spectroscopies indicated that AZM strongly interacted with iodine in the CH2Cl2, CCl4, and C6H5Cl solvents by a physically potent n→σ* interaction to produce a tri-iodide complex formulated as [AZM·I+]I3 -. XRD and TEM analyses revealed that, in all solvents, the AZM-I2 complex possessed an amorphous structure composed of spherical particles ranging from 80 to 110 nm that tended to aggregate into clusters. The findings described in the present study will hopefully contribute to optimizing the treatment protocols for COVID-19.
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Affiliation(s)
- Abdel Majid A Adam
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Hosam A Saad
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Amnah M Alsuhaibani
- Department of Physical Sport Science, Princess Nourah bint Abdulrahman University, 4545 - King Khalid Airport Unit No. 1, Riyadh 13415-7132, Saudi Arabia
| | - Moamen S Refat
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohamed S Hegab
- Deanship of Supportive Studies (D.S.S.), Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
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Fahmy A, Mohamed TA, Abu-Saied M, Helaly H, El-Dossoki F. Structure/property relationship of polyvinyl alcohol/dimethoxydimethylsilane composite membrane: Experimental and theoretical studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 228:117810. [PMID: 31791909 DOI: 10.1016/j.saa.2019.117810] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 11/15/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
A novel mixed matrix composite has been prepared using solution-casting method at different volume concentrations of polyvinyl alcohol; PVA (50, 67, 75 and 80%) and fixed amount of dimethoxydimethylsilane in air atmosphere. The hydrolyzed dimethyldisilanol acts as in-situ cross linker through a wet-out condensation between the hydroxyl moieties of SiOH and PVAOH. Such process improves the mechanical properties of composite membranes as compared to pristine PVA which has been determined as function of varied membrane components to evaluate the structure/property relationships. Furthermore, DFT (B3LYP)/6-31G(d) geometry and frequency computations were carried out for the suggested dimeric PVA structures via 1,3-diol linkage followed by condensation and hydrogen bonding interaction. Vibrational interpretations of composite membranes were proposed based on the computed wavenumbers, Cartesian coordinates displacements for the suggested hydrolyzed products involving the dominant PVA/SiOH/SiOC/SiOSi functional groups compared with those given in literatures. FTIR and EDX provide clear evidences for incorporating silicon to 3D network. Meanwhile, the infrared de-convoluted spectral interpretations ensure 17-30% cross-linked SiOC within the network of composite membranes.
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Affiliation(s)
- Alaa Fahmy
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, 11884 Cairo, Egypt; BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany
| | - Tarek A Mohamed
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, 11884 Cairo, Egypt.
| | - Mohamed Abu-Saied
- Polymeric Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research & Technological Applications, New Borg Al-Arab City, 21934 Alexandria, Egypt
| | | | - Farid El-Dossoki
- Chemistry Department, Faculty of Science, Port-Said University, Port Said, Egypt
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Utilization of tannic acid into spherical structured carbons based on charge-transfer complexation with tetracyanoethylene acceptor: Liquid-liquid and solid-solid interactions. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112325] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Hosny NM, Badr M, El-Dossoki FI. Copolymer of m-phenylenediamine and anthranilic acid (P(mPDA-co-AA): new precursor of MnO Nanoparticles. POLYM-PLAST TECH MAT 2018. [DOI: 10.1080/03602559.2018.1542724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Nasser M. Hosny
- Chemistry Department, Faculty of Science, Port-Said University, Port-Said, Egypt
| | - Mahmoud Badr
- Egyptian propylene and polypropylene company, Port-Said, Egypt
| | - Farid I. El-Dossoki
- Chemistry Department, Faculty of Science, Port-Said University, Port-Said, Egypt
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Kumar A, Rani R, Saini B, Bamezai RK. Thermophysical properties and taste behavior of l -serine/ l -valine in aqueous glucose, sucrose and lactose solutions at different temperatures. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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