The Experts below are selected from a list of 12603 Experts worldwide ranked by ideXlab platform
Tae Joo Shin - One of the best experts on this subject based on the ideXlab platform.
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A study of the human Hair Structure with a Zernike phase contrast X‐ray microscope
Journal of Microscopy, 2007Co-Authors: Hwa Shik Youn, Tae Joo ShinAbstract:Summary We have observed the internal Structure of human Hair shafts with a transmission Zernike phase contrast hard X-ray microscope. Due to the high spatial resolution and the high contrast of the microscope, we could image scales, macrofibrils, medulla and melanin without staining. The Structure of a black Hair shaft is compared with that of a white one.
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A study of the human Hair Structure with a Zernike phase contrast X-ray microscope.
Journal of microscopy, 2007Co-Authors: Hwa Shik Youn, Tae Joo ShinAbstract:We have observed the internal Structure of human Hair shafts with a transmission Zernike phase contrast hard X-ray microscope. Due to the high spatial resolution and the high contrast of the microscope, we could image scales, macrofibrils, medulla and melanin without staining. The Structure of a black Hair shaft is compared with that of a white one.
Hwa Shik Youn - One of the best experts on this subject based on the ideXlab platform.
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A study of the human Hair Structure with a Zernike phase contrast X‐ray microscope
Journal of Microscopy, 2007Co-Authors: Hwa Shik Youn, Tae Joo ShinAbstract:Summary We have observed the internal Structure of human Hair shafts with a transmission Zernike phase contrast hard X-ray microscope. Due to the high spatial resolution and the high contrast of the microscope, we could image scales, macrofibrils, medulla and melanin without staining. The Structure of a black Hair shaft is compared with that of a white one.
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A study of the human Hair Structure with a Zernike phase contrast X-ray microscope.
Journal of microscopy, 2007Co-Authors: Hwa Shik Youn, Tae Joo ShinAbstract:We have observed the internal Structure of human Hair shafts with a transmission Zernike phase contrast hard X-ray microscope. Due to the high spatial resolution and the high contrast of the microscope, we could image scales, macrofibrils, medulla and melanin without staining. The Structure of a black Hair shaft is compared with that of a white one.
Michael Bunce - One of the best experts on this subject based on the ideXlab platform.
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Interpreting biological degradative processes acting on mammalian Hair in the living and the dead: which ones are taphonomic?
Proceedings. Biological sciences, 2014Co-Authors: Silvana R. Tridico, Sandra L. Koch, Amy L. Michaud, G. Thomson, K. Paul Kirkbride, Michael BunceAbstract:Although the taphonomic (post-mortem) degradation processes relevant to teeth and bones have been well described, those taking place with regards to mammalian Hairs have not been characterized to the same extent. This present article describes, in detail, microscopic changes resulting from the actions of biological agents that digest and degrade Hairs. The most noteworthy and prevalent agents responsible for the destruction of Hair Structure are fungi, which use a range of strategies to invade and digest Hairs. One of the most important finds to emerge from this study is that taphonomic Structures and processes can easily be interpreted by the unwary as ‘real’, or as class characteristics for a particular animal taxon. Moreover, under certain conditions, ‘taphonomic’ processes normally associated with the dead are also present on the Hairs of the living. This work will improve the reliability of Hair examinations in forensic, archaeological and palaeontological applications—in addition, the finding has relevance in the protection of mammalian collections susceptible to infestation. This article also addresses the popular myth that ancient peoples were often red-Haired and discusses phenomena responsible for this observation. Insights gained from detailed characterization of taphonomic processes in 95 Hairs from a variety of species demonstrate the range and breadth of degradative effects on Hair Structure and colour. Lastly, the study demonstrates that Hairs often tell a story and that there is value of extracting as much morphological data as possible from Hairs, prior to destructive sampling for biomolecules.
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megafaunal split ends microscopical characterisation of Hair Structure and function in extinct woolly mammoth and woolly rhino
Quaternary Science Reviews, 2014Co-Authors: Paul K Kirkbride, Silvana R. Tridico, James Haile, Paul Rigby, Michael BunceAbstract:The large extinct megafaunal species of the Late Pleistocene, Mammuthus primigenius (woolly mammoth) and Coelodonta antiquitatis (woolly rhino) are renowned for their pelage. Despite this, very little research has been conducted on the form and function of Hair from these iconic species. Using permafrost preserved Hair samples from seven extinct megafaunal remains, this study presents an in-depth microscopical characterisation of preservation, taphonomy, microbial damage, pigmentation and morphological features of more than 420 Hairs. The presence of unique structural features in Hairs, from two extinct megafauna species, such as multiple medullae and unparallelled stiffness suggests evolution of traits that may have been critical for their survival in the harsh arctic environment. Lastly, despite popular depictions of red-Haired and/or uniformly coloured mammoths, a closer examination of pigmentation reveals that mammoth coats may have exhibited a mottled/variegated appearance and that their ‘true’ colours were not the vivid red/orange colour often depicted in reconstructions. Insights gained from microscopical examination of hundreds of extinct megafauna Hairs demonstrate the value of extracting as much morphological data as possible from ancient Hairs prior to destructive sampling for molecular analyses.
Silvana R. Tridico - One of the best experts on this subject based on the ideXlab platform.
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Interpreting biological degradative processes acting on mammalian Hair in the living and the dead: which ones are taphonomic?
Proceedings. Biological sciences, 2014Co-Authors: Silvana R. Tridico, Sandra L. Koch, Amy L. Michaud, G. Thomson, K. Paul Kirkbride, Michael BunceAbstract:Although the taphonomic (post-mortem) degradation processes relevant to teeth and bones have been well described, those taking place with regards to mammalian Hairs have not been characterized to the same extent. This present article describes, in detail, microscopic changes resulting from the actions of biological agents that digest and degrade Hairs. The most noteworthy and prevalent agents responsible for the destruction of Hair Structure are fungi, which use a range of strategies to invade and digest Hairs. One of the most important finds to emerge from this study is that taphonomic Structures and processes can easily be interpreted by the unwary as ‘real’, or as class characteristics for a particular animal taxon. Moreover, under certain conditions, ‘taphonomic’ processes normally associated with the dead are also present on the Hairs of the living. This work will improve the reliability of Hair examinations in forensic, archaeological and palaeontological applications—in addition, the finding has relevance in the protection of mammalian collections susceptible to infestation. This article also addresses the popular myth that ancient peoples were often red-Haired and discusses phenomena responsible for this observation. Insights gained from detailed characterization of taphonomic processes in 95 Hairs from a variety of species demonstrate the range and breadth of degradative effects on Hair Structure and colour. Lastly, the study demonstrates that Hairs often tell a story and that there is value of extracting as much morphological data as possible from Hairs, prior to destructive sampling for biomolecules.
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megafaunal split ends microscopical characterisation of Hair Structure and function in extinct woolly mammoth and woolly rhino
Quaternary Science Reviews, 2014Co-Authors: Paul K Kirkbride, Silvana R. Tridico, James Haile, Paul Rigby, Michael BunceAbstract:The large extinct megafaunal species of the Late Pleistocene, Mammuthus primigenius (woolly mammoth) and Coelodonta antiquitatis (woolly rhino) are renowned for their pelage. Despite this, very little research has been conducted on the form and function of Hair from these iconic species. Using permafrost preserved Hair samples from seven extinct megafaunal remains, this study presents an in-depth microscopical characterisation of preservation, taphonomy, microbial damage, pigmentation and morphological features of more than 420 Hairs. The presence of unique structural features in Hairs, from two extinct megafauna species, such as multiple medullae and unparallelled stiffness suggests evolution of traits that may have been critical for their survival in the harsh arctic environment. Lastly, despite popular depictions of red-Haired and/or uniformly coloured mammoths, a closer examination of pigmentation reveals that mammoth coats may have exhibited a mottled/variegated appearance and that their ‘true’ colours were not the vivid red/orange colour often depicted in reconstructions. Insights gained from microscopical examination of hundreds of extinct megafauna Hairs demonstrate the value of extracting as much morphological data as possible from ancient Hairs prior to destructive sampling for molecular analyses.
James Haile - One of the best experts on this subject based on the ideXlab platform.
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megafaunal split ends microscopical characterisation of Hair Structure and function in extinct woolly mammoth and woolly rhino
Quaternary Science Reviews, 2014Co-Authors: Paul K Kirkbride, Silvana R. Tridico, James Haile, Paul Rigby, Michael BunceAbstract:The large extinct megafaunal species of the Late Pleistocene, Mammuthus primigenius (woolly mammoth) and Coelodonta antiquitatis (woolly rhino) are renowned for their pelage. Despite this, very little research has been conducted on the form and function of Hair from these iconic species. Using permafrost preserved Hair samples from seven extinct megafaunal remains, this study presents an in-depth microscopical characterisation of preservation, taphonomy, microbial damage, pigmentation and morphological features of more than 420 Hairs. The presence of unique structural features in Hairs, from two extinct megafauna species, such as multiple medullae and unparallelled stiffness suggests evolution of traits that may have been critical for their survival in the harsh arctic environment. Lastly, despite popular depictions of red-Haired and/or uniformly coloured mammoths, a closer examination of pigmentation reveals that mammoth coats may have exhibited a mottled/variegated appearance and that their ‘true’ colours were not the vivid red/orange colour often depicted in reconstructions. Insights gained from microscopical examination of hundreds of extinct megafauna Hairs demonstrate the value of extracting as much morphological data as possible from ancient Hairs prior to destructive sampling for molecular analyses.
