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Arché-Núñez A, Krebsbach P, Levit B, Possti D, Gerston A, Knoll T, Velten T, Bar-Haim C, Oz S, Klorfeld-Auslender S, Hernandez-Sosa G, Mirelman A, Hanein Y. Bio-potential noise of dry printed electrodes: physiology versus the skin-electrode impedance. Physiol Meas 2023; 44:095006. [PMID: 37607562 DOI: 10.1088/1361-6579/acf2e7] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 08/22/2023] [Indexed: 08/24/2023]
Abstract
Objective. To explore noise characteristics and the effect physiological activity has on the link between impedance and noise.Approach. Dry-printed electrodes are emerging as a new and exciting technology for skin electro-physiology. Such electrode arrays offer many advantages including user convenience, quick placement, and high resolution. Here we analyze extensive electro-physiological data recorded from the arm and the face to study and quantify the noise of dry electrodes, and to characterize the link between noise and impedance. In particular, we studied the effect of the physiological state of the subject (e.g. rapid eye movement sleep) on noise.Main results. We show that baseline noise values extracted from dry electrodes in the arm are in agreement with the Nyquist equation. In the face, on the other hand, the measured noise values were higher than the values predicted by the Nyquist equation. In addition, we studied how different electrode properties affect performances, including electrode size, shape, and material properties.Significance. Altogether, the results presented here provide a basis for understanding dry electrode performances and substantiate their great potential in electro-physiological investigations.
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Affiliation(s)
- Ana Arché-Núñez
- Madrid Institute of Advanced Research in Nanoscience (IMDEA Nanociencia), Madrid, Spain
| | - Peter Krebsbach
- Light Technology Institute, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- InnovationLab, Heidelberg, Germany
| | - Bara Levit
- School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
| | | | | | - Thorsten Knoll
- Fraunhofer Institute of Biomedical Engineering IBMT, Sulzbach, Germany
| | - Thomas Velten
- Fraunhofer Institute of Biomedical Engineering IBMT, Sulzbach, Germany
| | - Chen Bar-Haim
- School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
| | - Shani Oz
- Department of BioMedical Engineering, Tel Aviv University, Tel Aviv, Israel
- Laboratory for Early Markers of Neurodegeneration, Neurological Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | | | - Gerardo Hernandez-Sosa
- Light Technology Institute, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- InnovationLab, Heidelberg, Germany
- Institue of Microstructure, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Anat Mirelman
- Laboratory for Early Markers of Neurodegeneration, Neurological Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yael Hanein
- School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
- X-trodes, Herzliya, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- Tel Aviv University Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv, Israel
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Mejri H, Haidisch A, Krebsbach P, Seiberlich M, Hernandez-Sosa G, Perevedentsev A. Gas-assisted blade-coating of organic semiconductors: molecular assembly, device fabrication and complex thin-film structuring. Nanoscale 2022; 14:17743-17753. [PMID: 36421075 DOI: 10.1039/d2nr05947a] [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] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The competitive performance of optoelectronic devices based on advanced organic semiconductors increasingly calls for suitably scalable processing schemes to capitalise on their application potential. With performance benchmarks typically established by spin-coating fabrication, doctor-blade deposition represents a widely available roll-to-roll-compatible means for the preparation of large-area samples and establishing the device upscaling potential. However, the inherently slower film formation kinetics often result in unfavourable active layer microstructures, requiring empirical and material-inefficient optimisation of solutions to reach the performance of spin-coated devices. Here we present a versatile approach to achieving performance parity for spin- and blade-coated devices using in situ gas-assisted drying enabled by a modular 3D-printed attachment. This is illustrated for organic photodetectors (OPDs) featuring bulk heterojunction active layers comprising blends of P3HT and PM6 polymer donors with the nonfullerene acceptor ITIC. Compared to conventionally blade-coated devices, mild drying gas pressures of 0.5-2 bar yield up to a 10-fold enhancement of specific detectivity by maximising external quantum efficiency and suppressing dark-current. Furthermore, controlling gas flux distribution enables one-step fabrication of 1D chain conformation and 2D chain orientation patterns in, respectively, PFO and P3HT:N2200 blend films, opening the possibility for high-throughput fabrication of devices with complex structured active layers.
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Affiliation(s)
- Hadhemi Mejri
- Light Technology Institute, Karlsruhe Institute of Technology, Engesser Str. 13, 76131 Karlsruhe, Germany.
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
| | - Anika Haidisch
- Light Technology Institute, Karlsruhe Institute of Technology, Engesser Str. 13, 76131 Karlsruhe, Germany.
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
| | - Peter Krebsbach
- Light Technology Institute, Karlsruhe Institute of Technology, Engesser Str. 13, 76131 Karlsruhe, Germany.
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
| | - Mervin Seiberlich
- Light Technology Institute, Karlsruhe Institute of Technology, Engesser Str. 13, 76131 Karlsruhe, Germany.
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
| | - Gerardo Hernandez-Sosa
- Light Technology Institute, Karlsruhe Institute of Technology, Engesser Str. 13, 76131 Karlsruhe, Germany.
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Aleksandr Perevedentsev
- Light Technology Institute, Karlsruhe Institute of Technology, Engesser Str. 13, 76131 Karlsruhe, Germany.
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
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Abstract
Marrow stromal cells (MSCs) include stem cells capable of forming all mesenchymal tissues, including bone. However, before MSCs can be successfully used in regeneration procedures, methods must be developed to stimulate their differentiation selectively to osteoblasts. Runx2, a bone-specific transcription factor, is known to stimulate osteoblast differentiation. In the present study, we tested the hypothesis that Runx2 gene therapy can be used to heal a critical-sized defect in mouse calvaria. Runx2-engineered MSCs displayed enhanced osteogenic potential and osteoblast-specific gene expression in vitro and in vivo. Runx2-expressing cells also dramatically enhanced the healing of critical-sized calvarial defects and increased both bone volume fraction and bone mineral density. These studies provide a novel route for enhancing osteogenesis that may have future therapeutic applications for craniofacial bone regeneration.
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Affiliation(s)
- Z. Zhao
- Program in Oral Health Sciences,
- Department of Periodontics and Oral Medicine, and
- Department of Biological and Material Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA; and
- Department of Biological Chemistry, School of Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Z. Wang
- Program in Oral Health Sciences,
- Department of Periodontics and Oral Medicine, and
- Department of Biological and Material Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA; and
- Department of Biological Chemistry, School of Medicine, University of Michigan, Ann Arbor, MI, USA
| | - C. Ge
- Program in Oral Health Sciences,
- Department of Periodontics and Oral Medicine, and
- Department of Biological and Material Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA; and
- Department of Biological Chemistry, School of Medicine, University of Michigan, Ann Arbor, MI, USA
| | - P. Krebsbach
- Program in Oral Health Sciences,
- Department of Periodontics and Oral Medicine, and
- Department of Biological and Material Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA; and
- Department of Biological Chemistry, School of Medicine, University of Michigan, Ann Arbor, MI, USA
| | - R.T. Franceschi
- Program in Oral Health Sciences,
- Department of Periodontics and Oral Medicine, and
- Department of Biological and Material Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA; and
- Department of Biological Chemistry, School of Medicine, University of Michigan, Ann Arbor, MI, USA
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Sartori E, Carvalho L, Zutin E, Mendonca D, Smith L, Vasconcellos L, Jepsen K, Krebsbach P, Mendonca G. Effect of titanium nanotopography on mobilization of mesenchymal stem cells. Dent Mater 2016. [DOI: 10.1016/j.dental.2016.08.184] [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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Xu B, Zhang J, Brewer E, Tu Q, Yu L, Tang J, Krebsbach P, Wieland M, Chen J. Osterix enhances BMSC-associated osseointegration of implants. J Dent Res 2009; 88:1003-7. [PMID: 19828887 DOI: 10.1177/0022034509346928] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Cellular and molecular events in osseointegration at the dental implant surface remain largely unknown. We hypothesized that bone marrow stromal cells (BMSCs) participate in this process, and that osterix (Osx) promotes implant osseointegration. To prove this hypothesis, we tracked double-labeled BMSCs in implantation sites created in nude mice transplanted with these cells. We also inserted implants into the femurs of our established transgenic mice after local administration of viruses encoding Osx, to determine the osteogenic effects of Osx. Immunohistochemical results demonstrated that BMSCs can recruit from peripheral circulation and participate in wound healing and osseointegration after implantation. Microcomputed tomography (microCT) analysis revealed an increased bone density at the bone-to-implant interface in the Osx group, and histomorphometric analysis indicated an elevated level of bone-to-implant contact in the Osx group. We concluded that exogenous BMSCs participate in the osseointegration after implantation, and that Osx overexpression accelerates osseointegration.
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Affiliation(s)
- B Xu
- Division of Oral Biology, Tufts University School of Dental Medicine, One Kneeland Street, Boston, MA 02111, USA
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6
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Tsumaki N, Liu Y, Yamada Y, Krebsbach P. Enhancer analysis of the alpha 1(II) and alpha 2(XI) collagen genes in transfected chondrocytes and transgenic mice. Methods Mol Biol 2000; 139:187-95. [PMID: 10840787 DOI: 10.1385/1-59259-063-2:187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- N Tsumaki
- National Institute of Health, Bethesda, MD, USA
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7
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Satomura K, Krebsbach P, Bianco P, Gehron Robey P. Osteogenic imprinting upstream of marrow stromal cell differentiation. J Cell Biochem 2000; 78:391-403. [PMID: 10861838] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Five spontaneously transformed cell lines were established from a population of murine bone marrow stromal cells (BMSCs) and the expression profiles of phenotype-characteristic genes, patterns of in vitro differentiation, and osteogenic capacity after in vivo transplantation were determined for each. All the clones expressed stable levels of cbfa1, the osteogenic "master" gene, whereas the levels of individual phenotypic mRNAs were variable within each, suggestive of both maturational and phenotypic plasticity in vitro. Varying levels of collagen type I and alkaline phosphatase (AP) were expressed in all the clonal lines. The clonal lines with proven in vivo osteogenic potential (3 out of 5) had a high proliferation rate and expressed bone sialoprotein (BSP), whereas the two nonosteogenic clones proliferated more slowly and never expressed BSP. Bone nodules were only observed in 2 out of 3 of the osteogenic lines, and only 1 out of three formed cartilage-like matrix in vitro. There was no evidence of chondrogenesis in the nonosteogenic lines. By contrast, LPL was expressed in two osteogenic and in two nonosteogenic lines. These results demonstrate the presence of multipotential and restricted progenitors in the murine stromal system. cbfa1, collagen type I, and AP expression were common to all, and therefore presumably early, basic traits of stromal cell lines that otherwise significantly differ with respect to growth and differentiation potential. This finding suggests that an osteogenic imprinting lies upstream of diversification, modulation, and restriction of stromal cell differentiation potential.
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Affiliation(s)
- K Satomura
- Craniofacial and Skeletal Diseases Branch, National Institute of Dental Research, National Institutes of Health, Bethesda, MD 20892, USA
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MacDougall M, DuPont BR, Simmons D, Reus B, Krebsbach P, Kärrman C, Holmgren G, Leach RJ, Forsman K. Ameloblastin gene (AMBN) maps within the critical region for autosomal dominant amelogenesis imperfecta at chromosome 4q21. Genomics 1997; 41:115-8. [PMID: 9126491 DOI: 10.1006/geno.1997.4643] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Amelogenesis imperfecta (AI) is a broad group of hereditary enamel defects that is characterized by a high degree of clinical diversity. Recently, the local hypoplastic form of autosomal dominant AI (AIH2) has been mapped to human chromosome 4q in a 17.6-cM region. This locus has been further refined to a 4-Mb interval between D4S2421 and Albumin. Recently, a cDNA clone for an enamel matrix protein, ameloblastin (AMBN), has been isolated. In this report, we have isolated a PAC human genomic clone containing the human AMBN gene. The AMBN was mapped by two color fluorescence in situ hybridization using two P1 genomic clones for sequence tagged site (STS) markers, D4S400 and D4S409, which flank the critical AIH2 region. Our results place AMBN at 4q21 between D4S409 (4q13) and D4S400 (4q21). Furthermore, the AMBN PAC genomic clone was shown to contain three STS markers, D4S2604, D4S2670, and D4S2609, which are contained within the critical region defined by six Swedish families with AIH2. AMBN is therefore a strong candidate gene for AIH2.
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Affiliation(s)
- M MacDougall
- Department of Pediatric Dentistry, University of Texas Health Science Center at San Antonio 78284, USA.
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Nakata K, Miyamoto S, Bernier S, Tanaka M, Utani A, Krebsbach P, Rhodes C, Yamada Y. The c-propeptide of type II procollagen binds to the enhancer region of the type II procollagen gene and regulates its transcription. Ann N Y Acad Sci 1996; 785:307-8. [PMID: 8702163 DOI: 10.1111/j.1749-6632.1996.tb56292.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- K Nakata
- National Institute of Dental Research, National Institutes of Health, Bethesda, Maryland 20892, USA
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