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Grant J, Lee E, Almeida M, Kim S, LoGrande N, Goyal G, Sesay AM, Breault DT, Prantil-Baun R, Ingber DE. Establishment of physiologically relevant oxygen gradients in microfluidic organ chips. LAB ON A CHIP 2022; 22:1584-1593. [PMID: 35274118 PMCID: PMC9088163 DOI: 10.1039/d2lc00069e] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
In vitro models of human organs must accurately reconstitute oxygen concentrations and gradients that are observed in vivo to mimic gene expression, metabolism, and host-microbiome interactions. Here we describe a simple strategy to achieve physiologically relevant oxygen tension in a two-channel human small intestine-on-a-chip (Intestine Chip) lined with primary human duodenal epithelium and intestinal microvascular endothelium in parallel channels separated by a porous membrane while both channels are perfused with oxygenated medium. This strategy was developed using computer simulations that predicted lowering the oxygen permeability of poly-dimethylsiloxane (PDMS) chips in specified locations using a gas impermeable film will allow the cells to naturally decrease the oxygen concentration through aerobic respiration and reach steady-state oxygen levels <36 mm Hg (<5%) within the epithelial lumen. The approach was experimentally confirmed using chips with embedded oxygen sensors that maintained this stable oxygen gradient. Furthermore, Intestine Chips cultured with this approach supported formation of a villus epithelium interfaced with a continuous endothelium and maintained intestinal barrier integrity for 72 h. This strategy recapitulates in vivo functionality in an efficient, inexpensive, and scalable format that improves the robustness and translatability of Organ Chip technology for studies on microbiome as well as oxygen sensitivity.
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Affiliation(s)
- Jennifer Grant
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Elizabeth Lee
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Micaela Almeida
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Seongmin Kim
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Nina LoGrande
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Girija Goyal
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Adama Marie Sesay
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - David T Breault
- Division of Endocrinology, Boston Children's Hospital, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA, 02115, USA
- Harvard Stem Cell Institute, Harvard University, Boston, MA 02139, USA
| | - Rachelle Prantil-Baun
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Vascular Biology Program and Department of Surgery, Harvard Medical School and Boston Children's Hospital, Boston, MA 02115, USA
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Dispersion characteristics of polypropylene/organo-modified single-walled carbon nanotube composites with a long-chain phosphonic acid added as the third dispersant component and their drawn orientation. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04175-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Jeong JH, Lee YK, Ahn KH. Stratification Mechanism in the Bidisperse Colloidal Film Drying Process: Evolution and Decomposition of Normal Stress Correlated with Microstructure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13712-13728. [PMID: 34751580 DOI: 10.1021/acs.langmuir.1c02455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The evolution of the normal stress and microstructure in the drying process of bidisperse colloidal films is studied using the Brownian dynamics simulation. Here, we show that the formation process of small-on-top stratification can be explained by normal stress development. At high PeL's, a stratified layer with small particles is formed near the interface. The accumulated particles near the interface induce the localization of normal stress so that the normal stress at the interface increases from the beginning of drying. We analyze this stress development from two points of view, on the global length scale and particle length scale. On the global length scale, the localization of normal stress is quantified by the scaled normal stress difference between the interface and substrate. For all PeL's tested in this study, the scaled normal stress difference increases until the accumulation region reaches the substrate. After the maximum, the stress difference remains at the maximum at lower PeL's, while it decreases at higher PeL's. The microstructural analysis shows that this stress development is explained through the evolution of the particle contact number distribution at the interface and substrate. On the particle length scale, we derive the scaled local force applied to each type of particle by decomposing the local normal stress. At high PeL's, the scaled local force for the large particle is large compared to that for the small particle near the interface, indicating that the large particles are strongly pushed away from the interface. Associating the volume fraction profile with the local force field, we suggest that the strong scaled force for the large particle is attributed to the significant increase in the average number of small particles in contact with large ones. This study has significance in probing the drying mechanism of bidisperse colloidal films and the stratification mechanism.
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Affiliation(s)
- Jae Hwan Jeong
- School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Korea
| | - Young Ki Lee
- School of Food Biotechnology and Chemical Engineering, Hankyong National University, Anseong 17579, Korea
| | - Kyung Hyun Ahn
- School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Korea
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Immobilising Microalgae and Cyanobacteria as Biocomposites: New Opportunities to Intensify Algae Biotechnology and Bioprocessing. ENERGIES 2021. [DOI: 10.3390/en14092566] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
There is a groundswell of interest in applying phototrophic microorganisms, specifically microalgae and cyanobacteria, for biotechnology and ecosystem service applications. However, there are inherent challenges associated with conventional routes to their deployment (using ponds, raceways and photobioreactors) which are synonymous with suspension cultivation techniques. Cultivation as biofilms partly ameliorates these issues; however, based on the principles of process intensification, by taking a step beyond biofilms and exploiting nature inspired artificial cell immobilisation, new opportunities become available, particularly for applications requiring extensive deployment periods (e.g., carbon capture and wastewater bioremediation). We explore the rationale for, and approaches to immobilised cultivation, in particular the application of latex-based polymer immobilisation as living biocomposites. We discuss how biocomposites can be optimised at the design stage based on mass transfer limitations. Finally, we predict that biocomposites will have a defining role in realising the deployment of metabolically engineered organisms for real world applications that may tip the balance of risk towards their environmental deployment.
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Fazullin DD, Mavrin GV. Thermal Stabilization of the Composite Ultrafiltration Membrane’s Surface Layer. SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY 2020. [DOI: 10.3103/s1068375520040043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Fazullin DD, Mavrin GV, Shaikhiev IG, Nizameev IR. Microwave Stabilization of a Dynamic Membrane Layer. MEMBRANES AND MEMBRANE TECHNOLOGIES 2019. [DOI: 10.1134/s2517751619010025] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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7
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Okada D, Kaneko H, Kato K, Furumi S, Takeguchi M, Yamamoto Y. Colloidal Crystallization and Ionic Liquid Induced Partial β-Phase Transformation of Poly(vinylidene fluoride) Nanoparticles. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00337] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Daichi Okada
- Division
of Materials Science and Tsukuba Research Center for Interdisciplinary
Materials Science (TIMS), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Hideki Kaneko
- Division
of Materials Science and Tsukuba Research Center for Interdisciplinary
Materials Science (TIMS), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Katsuhiro Kato
- Division
of Materials Science and Tsukuba Research Center for Interdisciplinary
Materials Science (TIMS), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Seiichi Furumi
- Department
of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka,
Shinjuku, Tokyo 162-8601, Japan
| | - Masaki Takeguchi
- Transmission
Electron Microscopy Station, National Institute for Materials Science (NIMS), 1-2-1,
Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Yohei Yamamoto
- Division
of Materials Science and Tsukuba Research Center for Interdisciplinary
Materials Science (TIMS), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Jia X, Zheng J, Lin S, Li W, Cai Q, Sui G, Yang X. Highly moisture-resistant epoxy composites: an approach based on liquid nano-reinforcement containing well-dispersed activated montmorillonite. RSC Adv 2015. [DOI: 10.1039/c5ra06397c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A one-step reaction approach was exploited to prepare an activated liquid nano-reinforcement (BGE-MMTs) for enhancing moisture-barrier characteristics of epoxy composites.
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Affiliation(s)
- Xiaolong Jia
- State Key Laboratory of Organic-Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Junyi Zheng
- State Key Laboratory of Organic-Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Song Lin
- Aerospace Research Institute of Materials and Processing Technology
- Beijing 100076
- P. R. China
| | - Wenbin Li
- State Key Laboratory of Organic-Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Qing Cai
- State Key Laboratory of Organic-Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Gang Sui
- State Key Laboratory of Organic-Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Xiaoping Yang
- State Key Laboratory of Organic-Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
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