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Chinnasami H, Dey MK, Devireddy R. Three-Dimensional Scaffolds for Bone Tissue Engineering. Bioengineering (Basel) 2023; 10:759. [PMID: 37508786 PMCID: PMC10376773 DOI: 10.3390/bioengineering10070759] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/21/2023] [Accepted: 06/21/2023] [Indexed: 07/30/2023] Open
Abstract
Immobilization using external or internal splints is a standard and effective procedure to treat minor skeletal fractures. In the case of major skeletal defects caused by extreme trauma, infectious diseases or tumors, the surgical implantation of a bone graft from external sources is required for a complete cure. Practical disadvantages, such as the risk of immune rejection and infection at the implant site, are high in xenografts and allografts. Currently, an autograft from the iliac crest of a patient is considered the "gold standard" method for treating large-scale skeletal defects. However, this method is not an ideal solution due to its limited availability and significant reports of morbidity in the harvest site (30%) as well as the implanted site (5-35%). Tissue-engineered bone grafts aim to create a mechanically strong, biologically viable and degradable bone graft by combining a three-dimensional porous scaffold with osteoblast or progenitor cells. The materials used for such tissue-engineered bone grafts can be broadly divided into ceramic materials (calcium phosphates) and biocompatible/bioactive synthetic polymers. This review summarizes the types of materials used to make scaffolds for cryo-preservable tissue-engineered bone grafts as well as the distinct methods adopted to create the scaffolds, including traditional scaffold fabrication methods (solvent-casting, gas-foaming, electrospinning, thermally induced phase separation) and more recent fabrication methods (fused deposition molding, stereolithography, selective laser sintering, Inkjet 3D printing, laser-assisted bioprinting and 3D bioprinting). This is followed by a short summation of the current osteochondrogenic models along with the required scaffold mechanical properties for in vivo applications. We then present a few results of the effects of freezing and thawing on the structural and mechanical integrity of PLLA scaffolds prepared by the thermally induced phase separation method and conclude this review article by summarizing the current regulatory requirements for tissue-engineered products.
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Affiliation(s)
- Harish Chinnasami
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Mohan Kumar Dey
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Ram Devireddy
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
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Taskin MB, Ahmad T, Wistlich L, Meinel L, Schmitz M, Rossi A, Groll J. Bioactive Electrospun Fibers: Fabrication Strategies and a Critical Review of Surface-Sensitive Characterization and Quantification. Chem Rev 2021; 121:11194-11237. [DOI: 10.1021/acs.chemrev.0c00816] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Mehmet Berat Taskin
- Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University of Würzburg, 97070 Würzburg, Germany
| | - Taufiq Ahmad
- Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University of Würzburg, 97070 Würzburg, Germany
| | - Laura Wistlich
- Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University of Würzburg, 97070 Würzburg, Germany
| | - Lorenz Meinel
- Institute of Pharmacy and Food Chemistry and Helmholtz Institute for RNA Based Infection Research, 97074 Würzburg, Germany
| | - Michael Schmitz
- Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University of Würzburg, 97070 Würzburg, Germany
| | - Angela Rossi
- Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University of Würzburg, 97070 Würzburg, Germany
| | - Jürgen Groll
- Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University of Würzburg, 97070 Würzburg, Germany
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Zhou Y, Shen Q, Lin Y, Xu S, Meng Q. Evaluation of the potential of chimeric spidroins/poly(L-lactic-co-ε-caprolactone) (PLCL) nanofibrous scaffolds for tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110752. [PMID: 32279827 DOI: 10.1016/j.msec.2020.110752] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 11/25/2019] [Accepted: 02/15/2020] [Indexed: 12/31/2022]
Abstract
In this study, a novel type of chimeric spider silk proteins (spidroins) NTW1-4CT was blended with poly(L-lactic-co-ε-caprolactone) (PLCL) to obtain nanofibrous scaffolds via electrospinning. Spidroins are composed of a N-terminal module (NT) from major ampullate spidroins, a C-terminal module (CT) from minor ampullate spidroins and 1-4 repeat modules (W) from aciniform spidroins. Physical characteristics and structures of NTW1-4CT/PLCL (25/75, w/w) blend scaffolds were carried out by scanning electron microscope (SEM), water contact angles measurements, Fourier transform infrared (FTIR) spectroscopy and tensile mechanical tests. Results showed that blending with spidroins decreased diameters of nanofibers and increased porosity and wettability of scaffolds. Additionally, chimeric spidroins undergone a similar structural transition in electrospinning process as with the formation process of native and artificial spider silks from other spidroins. With amounts of W modules increasing, the tensile strength and elongation of blend scaffolds were also increased. Particularly, NTW4CT/PLCL (25/75) scaffolds revealed much higher breaking stress than pure PLCL scaffolds. In vitro experiments, human umbilical vein endothelial cells (HUVEC) cultured on NTW4CT/PLCL (25/75) scaffolds displayed significantly higher activity of proliferation and adhesion than on pure PLCL scaffolds. All results suggested that chimeric spidroins/PLCL, especially NTW4CT/PLCL (25/75) blend nanofibrous scaffolds had promising potential for vascular tissue engineering.
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Affiliation(s)
- Yizhong Zhou
- Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, PR China
| | - Qingchun Shen
- Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, PR China
| | - Ying Lin
- Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, PR China
| | - Shouying Xu
- Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, PR China
| | - Qing Meng
- Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, PR China.
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Steiner D, Lang G, Fischer L, Winkler S, Fey T, Greil P, Scheibel T, Horch RE, Arkudas A. Intrinsic Vascularization of Recombinant eADF4(C16) Spider Silk Matrices in the Arteriovenous Loop Model. Tissue Eng Part A 2019; 25:1504-1513. [DOI: 10.1089/ten.tea.2018.0360] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Dominik Steiner
- Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Gregor Lang
- Biopolymer Processing, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany
| | - Laura Fischer
- Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Sophie Winkler
- Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Tobias Fey
- Department of Materials Science and Engineering, Institute of Glass and Ceramics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
- Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya, Japan
| | - Peter Greil
- Department of Materials Science and Engineering, Institute of Glass and Ceramics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Thomas Scheibel
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany
- Bayreuth Center for Colloids and Interfaces, University of Bayreuth, Bayreuth, Germany
- Bavarian Polymer Institute, University of Bayreuth, Bayreuth, Germany
- Bayreuther Zentrum für Molekulare Biowissenschaften (BZMB), University of Bayreuth, Bayreuth, Germany
- Bayreuther Materialzentrum (BayMAT), University of Bayreuth, Bayreuth, Germany
| | - Raymund E. Horch
- Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Andreas Arkudas
- Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
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Magaz A, Faroni A, Gough JE, Reid AJ, Li X, Blaker JJ. Bioactive Silk-Based Nerve Guidance Conduits for Augmenting Peripheral Nerve Repair. Adv Healthc Mater 2018; 7:e1800308. [PMID: 30260575 DOI: 10.1002/adhm.201800308] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 05/22/2018] [Indexed: 02/03/2023]
Abstract
Repair of peripheral nerve injuries depends upon complex biology stemming from the manifold and challenging injury-healing processes of the peripheral nervous system. While surgical treatment options are available, they tend to be characterized by poor clinical outcomes for the injured patients. This is particularly apparent in the clinical management of a nerve gap whereby nerve autograft remains the best clinical option despite numerous limitations; in addition, effective repair becomes progressively more difficult with larger gaps. Nerve conduit strategies based on tissue engineering approaches and the use of silk as scaffolding material have attracted much attention in recent years to overcome these limitations and meet the clinical demand of large gap nerve repair. This review examines the scientific advances made with silk-based conduits for peripheral nerve repair. The focus is on enhancing bioactivity of the conduits in terms of physical guidance cues, inner wall and lumen modification, and imbuing novel conductive functionalities.
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Affiliation(s)
- Adrián Magaz
- Bio‐Active Materials GroupSchool of MaterialsMSS TowerThe University of Manchester Manchester M13 9PL UK
- Institute of Materials Research and Engineering (IMRE)Agency for Science Technology and Research (A*STAR) 2 Fusionopolis, Way, Innovis #08‐03 Singapore 138634 Singapore
| | - Alessandro Faroni
- Blond McIndoe LaboratoriesDivision of Cell Matrix Biology and Regenerative MedicineSchool of Biological SciencesFaculty of Biology, Medicine and HealthThe University of ManchesterManchester Academic Health Science Centre Manchester M13 9PL UK
| | - Julie E. Gough
- School of MaterialsThe University of Manchester Manchester M13 9PL UK
| | - Adam J. Reid
- Blond McIndoe LaboratoriesDivision of Cell Matrix Biology and Regenerative MedicineSchool of Biological SciencesFaculty of Biology, Medicine and HealthThe University of ManchesterManchester Academic Health Science Centre Manchester M13 9PL UK
- Department of Plastic Surgery and BurnsWythenshawe HospitalManchester University NHS Foundation TrustManchester Academic Health Science Centre Manchester M23 9LT UK
| | - Xu Li
- Institute of Materials Research and Engineering (IMRE)Agency for Science Technology and Research (A*STAR) 2 Fusionopolis, Way, Innovis #08‐03 Singapore 138634 Singapore
| | - Jonny J. Blaker
- Bio‐Active Materials GroupSchool of MaterialsMSS TowerThe University of Manchester Manchester M13 9PL UK
- School of MaterialsThe University of Manchester Manchester M13 9PL UK
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Shehata N, Kandas I, Hassounah I, Sobolčiak P, Krupa I, Mrlik M, Popelka A, Steadman J, Lewis R. Piezoresponse, Mechanical, and Electrical Characteristics of Synthetic Spider Silk Nanofibers. NANOMATERIALS 2018; 8:nano8080585. [PMID: 30071581 PMCID: PMC6116277 DOI: 10.3390/nano8080585] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 07/13/2018] [Accepted: 07/17/2018] [Indexed: 11/30/2022]
Abstract
This work presents electrospun nanofibers from synthetic spider silk protein, and their application as both a mechanical vibration and humidity sensor. Spider silk solution was synthesized from minor ampullate silk protein (MaSp) and then electrospun into nanofibers with a mean diameter of less than 100 nm. Then, mechanical vibrations were detected through piezoelectric characteristics analysis using a piezo force microscope and a dynamic mechanical analyzer with a voltage probe. The piezoelectric coefficient (d33) was determined to be 3.62 pC/N. During humidity sensing, both mechanical and electric resistance properties of spider silk nanofibers were evaluated at varying high-level humidity, beyond a relative humidity of 70%. The mechanical characterizations of the nanofibers show promising results, with Young’s modulus and maximum strain of up to 4.32 MPa and 40.90%, respectively. One more interesting feature is the electric resistivity of the spider silk nanofibers, which were observed to be decaying with humidity over time, showing a cyclic effect in both the absence and presence of humidity due to the cyclic shrinkage/expansion of the protein chains. The synthesized nanocomposite can be useful for further biomedical applications, such as nerve cell regrowth and drug delivery.
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Affiliation(s)
- Nader Shehata
- Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt.
- Center of Smart Nanotechnology and Photonics (CSNP), SmartCI Research Center, Alexandria University, Alexandria 21544, Egypt.
- USTAR Bioinnovations Center, Utah State University, Logan, UT 84341, USA.
- Physics Department, Kuwait College of Science and Technology (KCST), Doha District 13133, Kuwait.
| | - Ishac Kandas
- Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt.
- Center of Smart Nanotechnology and Photonics (CSNP), SmartCI Research Center, Alexandria University, Alexandria 21544, Egypt.
- Physics Department, Kuwait College of Science and Technology (KCST), Doha District 13133, Kuwait.
| | - Ibrahim Hassounah
- USTAR Bioinnovations Center, Utah State University, Logan, UT 84341, USA.
| | - Patrik Sobolčiak
- Center of Advanced Materials, Qatar University, Doha 2713, Qatar.
| | - Igor Krupa
- Center of Advanced Materials, Qatar University, Doha 2713, Qatar.
| | - Miroslav Mrlik
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, Zlin 76001, Czech Republic.
| | - Anton Popelka
- Physics Department, Kuwait College of Science and Technology (KCST), Doha District 13133, Kuwait.
| | - Jesse Steadman
- USTAR Bioinnovations Center, Utah State University, Logan, UT 84341, USA.
| | - Randolph Lewis
- USTAR Bioinnovations Center, Utah State University, Logan, UT 84341, USA.
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Yi S, Xu L, Gu X. Scaffolds for peripheral nerve repair and reconstruction. Exp Neurol 2018; 319:112761. [PMID: 29772248 DOI: 10.1016/j.expneurol.2018.05.016] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 05/05/2018] [Accepted: 05/13/2018] [Indexed: 12/22/2022]
Abstract
Trauma-associated peripheral nerve defect is a widespread clinical problem. Autologous nerve grafting, the current gold standard technique for the treatment of peripheral nerve injury, has many internal disadvantages. Emerging studies showed that tissue engineered nerve graft is an effective substitute to autologous nerves. Tissue engineered nerve graft is generally composed of neural scaffolds and incorporating cells and molecules. A variety of biomaterials have been used to construct neural scaffolds, the main component of tissue engineered nerve graft. Synthetic polymers (e.g. silicone, polyglycolic acid, and poly(lactic-co-glycolic acid)) and natural materials (e.g. chitosan, silk fibroin, and extracellular matrix components) are commonly used along or together to build neural scaffolds. Many other materials, including the extracellular matrix, glass fabrics, ceramics, and metallic materials, have also been used to construct neural scaffolds. These biomaterials are fabricated to create specific structures and surface features. Seeding supporting cells and/or incorporating neurotrophic factors to neural scaffolds further improve restoration effects. Preliminary studies demonstrate that clinical applications of these neural scaffolds achieve satisfactory functional recovery. Therefore, tissue engineered nerve graft provides a good alternative to autologous nerve graft and represents a promising frontier in neural tissue engineering.
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Affiliation(s)
- Sheng Yi
- Key laboratory of neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu, China
| | - Lai Xu
- Key laboratory of neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu, China
| | - Xiaosong Gu
- Key laboratory of neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu, China.
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Chinnasami H, Gimble J, Devireddy RV. Structure–property relation of porous poly (l-lactic acid) scaffolds fabricated using organic solvent mixtures and controlled cooling rates and its bio-compatibility with human adipose stem cells. J BIOACT COMPAT POL 2018. [DOI: 10.1177/0883911518758354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Thermally induced phase separation method was used to make porous three-dimensional poly (l-lactic acid) scaffolds. The effect of imposed thermal profile during freezing of the poly (l-lactic acid) in dioxane solution on the scaffold was characterized by their micro-structure, porosity (%), pore sizes’ distribution, and mechanical strength. The porosity (%) decreased considerably with increasing concentrations of poly (l-lactic acid) in the solution, while a decreasing trend was observed with increasing cooling rates. The mechanical strength increases with increase in poly (l-lactic acid) concentration and also with increase in the cooling rate for both types of solvents. Therefore, mechanical strength was increased by higher cooling rates while the porosity (%) remained relatively consistent. Scaffolds made using higher concentrations of poly (l-lactic acid; 7% and 10% w/v) in solvent showed better mechanical strength which improved relatively with increasing cooling rates (1°C–40°C/min). This phenomenon of enhanced structural integrity with increasing cooling rates was more prominent in scaffolds made from higher initial poly (l-lactic acid) concentrations. Human adipose–derived stem cells were cultured on these scaffold (7% and 10% w/v) prepared by thermally induced phase separation at all cooling rates to measure the cell proliferation efficiency as a function of their micro-structural properties. Mean pore sizes played a crucial role in cell proliferation than percent porosity since all scaffolds were >88% porous. The viability percent of human adipose tissue–derived adult stem cells increased consistently with longer periods of culture. Thus, poly (l-lactic acid) scaffolds prepared by thermally controlled thermally induced phase separation method could be a prime candidate for making ex vivo tissue-engineered grafts for surgical implantation.
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Affiliation(s)
- Harish Chinnasami
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
| | - Jeff Gimble
- LaCell, LLC and Tulane Center for Stem Cell Research & Regenerative Medicine and Departments of Medicine, Structural & Cellular Biology and Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | - Ram V Devireddy
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
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Weatherbee-Martin N, Xu L, Hupe A, Kreplak L, Fudge DS, Liu XQ, Rainey JK. Identification of Wet-Spinning and Post-Spin Stretching Methods Amenable to Recombinant Spider Aciniform Silk. Biomacromolecules 2016; 17:2737-46. [PMID: 27387592 DOI: 10.1021/acs.biomac.6b00857] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Spider silks are outstanding biomaterials with mechanical properties that outperform synthetic materials. Of the six fibrillar spider silks, aciniform (or wrapping) silk is the toughest through a unique combination of strength and extensibility. In this study, a wet-spinning method for recombinant Argiope trifasciata aciniform spidroin (AcSp1) is introduced. Recombinant AcSp1 comprising three 200 amino acid repeat units was solubilized in a 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP)/water mixture, forming a viscous α-helix-enriched spinning dope, and wet-spun into an ethanol/water coagulation bath allowing continuous fiber production. Post-spin stretching of the resulting wet-spun fibers in water significantly improved fiber strength, enriched β-sheet conformation without complete α-helix depletion, and enhanced birefringence. These methods allow reproducible aciniform silk fiber formation, albeit with lower extensibility than native silk, requiring conditions and methods distinct from those previously reported for other silk proteins. This provides an essential starting point for tailoring wet-spinning of aciniform silk to achieve desired properties.
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Affiliation(s)
| | | | - Andre Hupe
- Department of Integrative Biology, University of Guelph , Guelph, Ontario N1G 2W1, Canada
| | | | - Douglas S Fudge
- Department of Integrative Biology, University of Guelph , Guelph, Ontario N1G 2W1, Canada
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Chen G, Guo J, Nie J, Ma G. Preparation, characterization, and application of PEO/HA core shell nanofibers based on electric field induced phase separation during electrospinning. POLYMER 2016. [DOI: 10.1016/j.polymer.2015.12.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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KÖSE S, AERTS KAYA F, DENKBAŞ EB, KORKUSUZ P, ÇETİNKAYA FD. Evaluation of biocompatibility of random or aligned electrospun polyhydroxybutyrate scaffolds combined with human mesenchymal stem cells. Turk J Biol 2016. [DOI: 10.3906/biy-1508-18] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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To spin or not to spin: spider silk fibers and more. Appl Microbiol Biotechnol 2015; 99:9361-80. [DOI: 10.1007/s00253-015-6948-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Revised: 08/16/2015] [Accepted: 08/20/2015] [Indexed: 12/18/2022]
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Braghirolli DI, Steffens D, Pranke P. Electrospinning for regenerative medicine: a review of the main topics. Drug Discov Today 2014; 19:743-53. [DOI: 10.1016/j.drudis.2014.03.024] [Citation(s) in RCA: 157] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 03/06/2014] [Accepted: 03/27/2014] [Indexed: 12/20/2022]
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