UV protection of Euglenoids: Computation of the electromagnetic response
Euglenoids are a group of predominantly free-living unicellular microorganisms that mostly live in freshwater bodies but can also be found in marine and brackish waters. These organisms have a characteristic that distinguishes them form the other protists: they are covered by a surface pellicle form...
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todo:paper_16057422_v9531_n_p_Dolinko2023-10-03T16:27:51Z UV protection of Euglenoids: Computation of the electromagnetic response Dolinko, A. Valencia, C. Skigin, D.C. Inchaussandague, M.E. Tolivia, A. Conforti, V. Svanberg K. Kurachi C. Bagnato V.S. Tromberg B.J. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; International Photodynamic Association; The Sao Paulo Research Foundation (FAPESP); The Society of Photo-Optical Instrumentation Engineers (SPIE) microalgae natural photonic structures photonic simulation method UV protection Algae Bioinformatics Diffraction Diffraction gratings Microbiology Microorganisms Photonics Protozoa Ultraviolet radiation Biological structures Electromagnetic response Electron microscopy images Micro-algae Photonic structure Protection mechanisms Unicellular microorganisms UV protection Radiation protection Euglenoids are a group of predominantly free-living unicellular microorganisms that mostly live in freshwater bodies but can also be found in marine and brackish waters. These organisms have a characteristic that distinguishes them form the other protists: they are covered by a surface pellicle formed by S-shaped overlapping bands which resemble a diffraction grating. These microorganisms have developed numerous protection mechanisms intended to avoid or reduce the damage produced by UV radiation, such as the production of pigments and the repair mechanisms in hours of darkness and during daylight. In a recent paper we have investigated the role played by the pellicle of Euglenoids in the protection of the cell against UV radiation, by means of an electromagnetic approach based on the approximation of the pellicle profile by a one-dimensional diffraction grating. This simplified model allowed us to confirm that under certain incidence conditions, the corrugation of the pellicle helps increase the UV reflection, and consequently, diminish the UV radiation that enters the cell. In order to analyze the electromagnetic response of the whole cell, we extend two different approaches to calculate the reflected response: a simulation method especially developed to deal with complex biological structures that permits the introduction of the scattering object via an electron microscopy image, and the integral method, which has been widely used to compute the electromagnetic response of finite structures. Numerical results of near and far fields are shown. © 2015 Copyright SPIE. Fil:Valencia, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Skigin, D.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Inchaussandague, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Conforti, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16057422_v9531_n_p_Dolinko |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
microalgae natural photonic structures photonic simulation method UV protection Algae Bioinformatics Diffraction Diffraction gratings Microbiology Microorganisms Photonics Protozoa Ultraviolet radiation Biological structures Electromagnetic response Electron microscopy images Micro-algae Photonic structure Protection mechanisms Unicellular microorganisms UV protection Radiation protection |
| spellingShingle |
microalgae natural photonic structures photonic simulation method UV protection Algae Bioinformatics Diffraction Diffraction gratings Microbiology Microorganisms Photonics Protozoa Ultraviolet radiation Biological structures Electromagnetic response Electron microscopy images Micro-algae Photonic structure Protection mechanisms Unicellular microorganisms UV protection Radiation protection Dolinko, A. Valencia, C. Skigin, D.C. Inchaussandague, M.E. Tolivia, A. Conforti, V. Svanberg K. Kurachi C. Bagnato V.S. Tromberg B.J. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; International Photodynamic Association; The Sao Paulo Research Foundation (FAPESP); The Society of Photo-Optical Instrumentation Engineers (SPIE) UV protection of Euglenoids: Computation of the electromagnetic response |
| topic_facet |
microalgae natural photonic structures photonic simulation method UV protection Algae Bioinformatics Diffraction Diffraction gratings Microbiology Microorganisms Photonics Protozoa Ultraviolet radiation Biological structures Electromagnetic response Electron microscopy images Micro-algae Photonic structure Protection mechanisms Unicellular microorganisms UV protection Radiation protection |
| description |
Euglenoids are a group of predominantly free-living unicellular microorganisms that mostly live in freshwater bodies but can also be found in marine and brackish waters. These organisms have a characteristic that distinguishes them form the other protists: they are covered by a surface pellicle formed by S-shaped overlapping bands which resemble a diffraction grating. These microorganisms have developed numerous protection mechanisms intended to avoid or reduce the damage produced by UV radiation, such as the production of pigments and the repair mechanisms in hours of darkness and during daylight. In a recent paper we have investigated the role played by the pellicle of Euglenoids in the protection of the cell against UV radiation, by means of an electromagnetic approach based on the approximation of the pellicle profile by a one-dimensional diffraction grating. This simplified model allowed us to confirm that under certain incidence conditions, the corrugation of the pellicle helps increase the UV reflection, and consequently, diminish the UV radiation that enters the cell. In order to analyze the electromagnetic response of the whole cell, we extend two different approaches to calculate the reflected response: a simulation method especially developed to deal with complex biological structures that permits the introduction of the scattering object via an electron microscopy image, and the integral method, which has been widely used to compute the electromagnetic response of finite structures. Numerical results of near and far fields are shown. © 2015 Copyright SPIE. |
| format |
CONF |
| author |
Dolinko, A. Valencia, C. Skigin, D.C. Inchaussandague, M.E. Tolivia, A. Conforti, V. Svanberg K. Kurachi C. Bagnato V.S. Tromberg B.J. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; International Photodynamic Association; The Sao Paulo Research Foundation (FAPESP); The Society of Photo-Optical Instrumentation Engineers (SPIE) |
| author_facet |
Dolinko, A. Valencia, C. Skigin, D.C. Inchaussandague, M.E. Tolivia, A. Conforti, V. Svanberg K. Kurachi C. Bagnato V.S. Tromberg B.J. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; International Photodynamic Association; The Sao Paulo Research Foundation (FAPESP); The Society of Photo-Optical Instrumentation Engineers (SPIE) |
| author_sort |
Dolinko, A. |
| title |
UV protection of Euglenoids: Computation of the electromagnetic response |
| title_short |
UV protection of Euglenoids: Computation of the electromagnetic response |
| title_full |
UV protection of Euglenoids: Computation of the electromagnetic response |
| title_fullStr |
UV protection of Euglenoids: Computation of the electromagnetic response |
| title_full_unstemmed |
UV protection of Euglenoids: Computation of the electromagnetic response |
| title_sort |
uv protection of euglenoids: computation of the electromagnetic response |
| url |
http://hdl.handle.net/20.500.12110/paper_16057422_v9531_n_p_Dolinko |
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