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Using probes such as calcium ion indicators, some of which are excited by ultraviolet light, considerations for the aberration and transmittance of ultraviolet light through the microscope optics can be eliminated in multiphoton excitation microscopy. Specimen damage from the ultraviolet light can also be reduced. Multiphoton excitation is expected strongly to photo-activate caged compounds only at a three-dimensionally specific point in specimens.

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Brian Herman and Victoria E. Centonze Frohlich - Department of Cellular and Structural Biology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229.

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A confocal laser scanning microscope must be modified and equipped with a specialized near-infrared pulsed laser system in order to perform multiphoton imaging. The following characteristics should be used as a guide when comparing multiphoton excitation with conventional laser scanning confocal microscopy.

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Thomas J. Fellers and Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.

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by Y Hu · 2021 · Cited by 11 — The refractive index, defined as the ratio of the velocity of light in a vacuum and the material, is one of the most important physical ...

In multiphoton excitation microscopy, fluorescent dyes are excited by absorbing the energy of two or more photons simultaneously (see Figure 1). For two-photon excitation, The dyes are excited at around twice the wavelength used in ordinary fluorescence observations, since the photon energy is inversely proportional to the wavelength. Because the excitation probability of the fluorescent dye in  two-photon excitation is proportional to the square of excitation light intensity, only the area proximal to the focal point, where the photon density is high, can be excited; tomographic images can then be obtained by scanning the laser beam (Figure 2, in which the non-excited area is grayed). The multiphoton excitation laser scanning microscopy provides similar tomographic images to the confocal LSM through the different principles.

Yes, focal length is expressed in millimetres (mm). · In case of a focal length like 16–80mm, the higher number usually means a bigger zoom, ...

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Rack the condenser down slightly and cut down the aperture of the iris diaphragm so that the light, although even, is dim.

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Haruo Kasai Laboratory - The Kasai laboratory has developed new approaches, based on two-photon excitation microscopy, to the study of neurons and secretory cells. The application of these approaches has provided important insight into the structure-function relations of central synapses and the mechanisms of exocytosis in both neurons and secretory glands such as pancreatic islets and acini.

Joseph R. Lakowicz - Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland and University of Maryland Biotechnology Institute (UMBI), 725 West Lombard Street, Baltimore, Maryland 21201.

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