The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform
X L Zhu - One of the best experts on this subject based on the ideXlab platform.
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time resolved photoion imaging spectroscopy determining Energy Distribution in multiphoton absorption experiments
Journal of Chemical Physics, 2018Co-Authors: D B Qian, F D Shi, L Chen, S Martin, J Bernard, Jie Yang, Si Zhang, Zhiqiang Chen, X L ZhuAbstract:We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be extended to a wide variety of molecules and clusters having decay mechanisms similar to those of fullerene molecules.We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be ex...
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Time-resolved photoion imaging spectroscopy: Determining Energy Distribution in multiphoton absorption experiments
Journal of Chemical Physics, 2018Co-Authors: D B Qian, F D Shi, L Chen, S Martin, J Bernard, Jie Yang, S. F. Zhang, Z. Q. Chen, X L ZhuAbstract:We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be extended to a wide variety of molecules and clusters having decay mechanisms similar to those of fullerene molecules.
Ahmed Hamraoui - One of the best experts on this subject based on the ideXlab platform.
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Influence of surface Energy Distribution on neuritogenesis
Colloids and Surfaces B: Biointerfaces, 2009Co-Authors: Guillaume Lamour, Nathalie Journiac, Sylvie Souès, Stéphanie Bonneau, Pierre Nassoy, Ahmed HamraouiAbstract:PC12 cells are a useful model to study neuronal differentiation, as they can undergo terminal differentiation, typically when treated with nerve growth factor (NGF). In this study we investigated the influence of surface Energy Distribution on PC12 cell differentiation, by atomic force microscopy (AFM) and immunofluorescence. Glass surfaces were modified by chemisorption: an aminosilane. n-[3-(trimethoxysilyl)propyl]ethylendiamine (C(8)H(22)N(2)O(3)Si; EDA), was grafted by polycondensation. AFM analysis of substrate topography showed the presence of aggregates suggesting that the adsorption is heterogeneous, and generates local gradients in Energy of adhesion. PC12 cells cultured on these modified glass surfaces developed neurites in absence of NGF treatment. In contrast, PC12 cells did not grow neurites when cultured in the absence of NGF on a relatively smooth surface such as poly-L-lysine substrate, where amine Distribution is rather homogeneous. These results suggest that surface Energy Distribution, through cell-substrate interactions, triggers mechanisms that will drive PC12 cells to differentiate and to initiate neuritogenesis. We were able to create a controlled physical nano-structuration with local variations in surface Energy that allowed the study of these parameters on neuritogenesis
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Influence of surface Energy Distribution on neuritogenesis
Colloids and Surfaces B: Biointerfaces, 2009Co-Authors: Guillaume Lamour, Nathalie Journiac, Sylvie Souès, Stéphanie Bonneau, Pierre Nassoy, Ahmed HamraouiAbstract:PC12 cells are a useful model to study neuronal differentiation, as they can undergo terminal differentiation, typically when treated with nerve growth factor (NGF). In this study we investigated the influence of surface Energy Distribution on PC12 cell differentiation, by atomic force microscopy (AFM) and immunofluorescence. Glass surfaces were modified by chemisorption: an aminosilane. n-[3-(trimethoxysilyl)propyl]ethylendiamine (C(8)H(22)N(2)O(3)Si; EDA), was grafted by polycondensation. AFM analysis of substrate topography showed the presence of aggregates suggesting that the adsorption is heterogeneous, and generates local gradients in Energy of adhesion. PC12 cells cultured on these modified glass surfaces developed neurites in absence of NGF treatment. In contrast, PC12 cells did not grow neurites when cultured in the absence of NGF on a relatively smooth surface such as poly-L-lysine substrate, where amine Distribution is rather homogeneous. These results suggest that surface Energy Distribution, through cell-substrate interactions, triggers mechanisms that will drive PC12 cells to differentiate and to initiate neuritogenesis. We were able to create a controlled physical nano-structuration with local variations in surface Energy that allowed the study of these parameters on neuritogenesis. (C) 2009 Elsevier B.V. All rights reserved.
D B Qian - One of the best experts on this subject based on the ideXlab platform.
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time resolved photoion imaging spectroscopy determining Energy Distribution in multiphoton absorption experiments
Journal of Chemical Physics, 2018Co-Authors: D B Qian, F D Shi, L Chen, S Martin, J Bernard, Jie Yang, Si Zhang, Zhiqiang Chen, X L ZhuAbstract:We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be extended to a wide variety of molecules and clusters having decay mechanisms similar to those of fullerene molecules.We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be ex...
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Time-resolved photoion imaging spectroscopy: Determining Energy Distribution in multiphoton absorption experiments
Journal of Chemical Physics, 2018Co-Authors: D B Qian, F D Shi, L Chen, S Martin, J Bernard, Jie Yang, S. F. Zhang, Z. Q. Chen, X L ZhuAbstract:We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be extended to a wide variety of molecules and clusters having decay mechanisms similar to those of fullerene molecules.
Guillaume Lamour - One of the best experts on this subject based on the ideXlab platform.
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Influence of surface Energy Distribution on neuritogenesis
Colloids and Surfaces B: Biointerfaces, 2009Co-Authors: Guillaume Lamour, Nathalie Journiac, Sylvie Souès, Stéphanie Bonneau, Pierre Nassoy, Ahmed HamraouiAbstract:PC12 cells are a useful model to study neuronal differentiation, as they can undergo terminal differentiation, typically when treated with nerve growth factor (NGF). In this study we investigated the influence of surface Energy Distribution on PC12 cell differentiation, by atomic force microscopy (AFM) and immunofluorescence. Glass surfaces were modified by chemisorption: an aminosilane. n-[3-(trimethoxysilyl)propyl]ethylendiamine (C(8)H(22)N(2)O(3)Si; EDA), was grafted by polycondensation. AFM analysis of substrate topography showed the presence of aggregates suggesting that the adsorption is heterogeneous, and generates local gradients in Energy of adhesion. PC12 cells cultured on these modified glass surfaces developed neurites in absence of NGF treatment. In contrast, PC12 cells did not grow neurites when cultured in the absence of NGF on a relatively smooth surface such as poly-L-lysine substrate, where amine Distribution is rather homogeneous. These results suggest that surface Energy Distribution, through cell-substrate interactions, triggers mechanisms that will drive PC12 cells to differentiate and to initiate neuritogenesis. We were able to create a controlled physical nano-structuration with local variations in surface Energy that allowed the study of these parameters on neuritogenesis
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Influence of surface Energy Distribution on neuritogenesis
Colloids and Surfaces B: Biointerfaces, 2009Co-Authors: Guillaume Lamour, Nathalie Journiac, Sylvie Souès, Stéphanie Bonneau, Pierre Nassoy, Ahmed HamraouiAbstract:PC12 cells are a useful model to study neuronal differentiation, as they can undergo terminal differentiation, typically when treated with nerve growth factor (NGF). In this study we investigated the influence of surface Energy Distribution on PC12 cell differentiation, by atomic force microscopy (AFM) and immunofluorescence. Glass surfaces were modified by chemisorption: an aminosilane. n-[3-(trimethoxysilyl)propyl]ethylendiamine (C(8)H(22)N(2)O(3)Si; EDA), was grafted by polycondensation. AFM analysis of substrate topography showed the presence of aggregates suggesting that the adsorption is heterogeneous, and generates local gradients in Energy of adhesion. PC12 cells cultured on these modified glass surfaces developed neurites in absence of NGF treatment. In contrast, PC12 cells did not grow neurites when cultured in the absence of NGF on a relatively smooth surface such as poly-L-lysine substrate, where amine Distribution is rather homogeneous. These results suggest that surface Energy Distribution, through cell-substrate interactions, triggers mechanisms that will drive PC12 cells to differentiate and to initiate neuritogenesis. We were able to create a controlled physical nano-structuration with local variations in surface Energy that allowed the study of these parameters on neuritogenesis. (C) 2009 Elsevier B.V. All rights reserved.
F D Shi - One of the best experts on this subject based on the ideXlab platform.
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time resolved photoion imaging spectroscopy determining Energy Distribution in multiphoton absorption experiments
Journal of Chemical Physics, 2018Co-Authors: D B Qian, F D Shi, L Chen, S Martin, J Bernard, Jie Yang, Si Zhang, Zhiqiang Chen, X L ZhuAbstract:We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be extended to a wide variety of molecules and clusters having decay mechanisms similar to those of fullerene molecules.We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be ex...
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Time-resolved photoion imaging spectroscopy: Determining Energy Distribution in multiphoton absorption experiments
Journal of Chemical Physics, 2018Co-Authors: D B Qian, F D Shi, L Chen, S Martin, J Bernard, Jie Yang, S. F. Zhang, Z. Q. Chen, X L ZhuAbstract:We propose an approach to determine the excitation Energy Distribution due to multiphoton absorption in the case of excited systems following decays to produce different ion species. This approach is based on the measurement of the time-resolved photoion position spectrum by using velocity map imaging spectrometry and an unfocused laser beam with a low fluence and homogeneous profile. Such a measurement allows us to identify the species and the origin of each ion detected and to depict the Energy Distribution using a pure Poisson’s equation involving only one variable which is proportional to the absolute photon absorption cross section. A cascade decay model is used to build direct connections between the Energy Distribution and the probability to detect each ionic species. Comparison between experiments and simulations permits the Energy Distribution and accordingly the absolute photon absorption cross section to be determined. This approach is illustrated using C60 as an example. It may therefore be extended to a wide variety of molecules and clusters having decay mechanisms similar to those of fullerene molecules.
