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Magnetotrichography: Measuring the dc magnetic field produced by hair follicles
We here describe the dc magnetic field over the human head produced by healthy hair follicles when the scalp is lightly pressed. This phenomenon was briefly reported decades earlier, where a double-planar SQUID (Superconducting Quantum Interference Devices) gradiometer at a single location was used....
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6821812/ https://www.ncbi.nlm.nih.gov/pubmed/31666670 http://dx.doi.org/10.1038/s41598-019-52110-y |
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author | Khan, Sheraz Cohen, David |
author_facet | Khan, Sheraz Cohen, David |
author_sort | Khan, Sheraz |
collection | PubMed |
description | We here describe the dc magnetic field over the human head produced by healthy hair follicles when the scalp is lightly pressed. This phenomenon was briefly reported decades earlier, where a double-planar SQUID (Superconducting Quantum Interference Devices) gradiometer at a single location was used. We here perform a larger study, using the dcMEG containing 102 double-planar gradiometers covering the whole scalp. The field is displayed as an on-line arrow map over the head, showing the approximate flow of direct current (dc) in the scalp. Standard sets of five arrow maps per subject were measured, where the subject successively pressed parts of their head against the inside of the helmet. These maps were made for 15 normal subjects (5 females), and 2 with alopecia (non-functioning follicles). The directions of “pressed” generating arrows always followed the natural tilt of the follicles, verifying the follicles as generators, with a time constant of about one second. The maximum generator dipole strength was about 24 µA-cm. Scalp electric potentials corresponding to the magnetic signals were masked by much larger electrodermal potentials. Therefore, this magnetic method, called magnetotrichography, is unique in measuring this follicular electrical activity, with possible applications in studying baldness and hair diseases. |
format | Online Article Text |
id | pubmed-6821812 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-68218122019-11-05 Magnetotrichography: Measuring the dc magnetic field produced by hair follicles Khan, Sheraz Cohen, David Sci Rep Article We here describe the dc magnetic field over the human head produced by healthy hair follicles when the scalp is lightly pressed. This phenomenon was briefly reported decades earlier, where a double-planar SQUID (Superconducting Quantum Interference Devices) gradiometer at a single location was used. We here perform a larger study, using the dcMEG containing 102 double-planar gradiometers covering the whole scalp. The field is displayed as an on-line arrow map over the head, showing the approximate flow of direct current (dc) in the scalp. Standard sets of five arrow maps per subject were measured, where the subject successively pressed parts of their head against the inside of the helmet. These maps were made for 15 normal subjects (5 females), and 2 with alopecia (non-functioning follicles). The directions of “pressed” generating arrows always followed the natural tilt of the follicles, verifying the follicles as generators, with a time constant of about one second. The maximum generator dipole strength was about 24 µA-cm. Scalp electric potentials corresponding to the magnetic signals were masked by much larger electrodermal potentials. Therefore, this magnetic method, called magnetotrichography, is unique in measuring this follicular electrical activity, with possible applications in studying baldness and hair diseases. Nature Publishing Group UK 2019-10-30 /pmc/articles/PMC6821812/ /pubmed/31666670 http://dx.doi.org/10.1038/s41598-019-52110-y Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Khan, Sheraz Cohen, David Magnetotrichography: Measuring the dc magnetic field produced by hair follicles |
title | Magnetotrichography: Measuring the dc magnetic field produced by hair follicles |
title_full | Magnetotrichography: Measuring the dc magnetic field produced by hair follicles |
title_fullStr | Magnetotrichography: Measuring the dc magnetic field produced by hair follicles |
title_full_unstemmed | Magnetotrichography: Measuring the dc magnetic field produced by hair follicles |
title_short | Magnetotrichography: Measuring the dc magnetic field produced by hair follicles |
title_sort | magnetotrichography: measuring the dc magnetic field produced by hair follicles |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6821812/ https://www.ncbi.nlm.nih.gov/pubmed/31666670 http://dx.doi.org/10.1038/s41598-019-52110-y |
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