“ultramicroscope”的概念、定义、翻译、参考文献-科学参考

ultramicroscope

Physics

A form of microscope that uses the Tyndall effect to reveal the presence of particles that cannot be seen with a normal optical microscope. Colloidal particles, smoke particles, etc., are suspended in a liquid or gas in a cell with a black background and illuminated by an intense cone of light that enters the cell from the side and has its apex in the field of view. The particles then produce diffraction-ring systems, appearing as bright specks on the dark background.

Chemistry

A form of microscope that uses the Tyndall effect to reveal the presence of particles that cannot be seen with a normal optical microscope. Colloidal particles, smoke particles, etc., are suspended in a liquid or gas in a cell with a black background and illuminated by an intense cone of light that enters the cell from the side and has its apex in the field of view. The particles then produce diffraction-ring systems, appearing as bright specks on the dark background.

Biology

A form of microscope that uses a sheet of laser light projected from either side to illuminate a thin horizontal plane through a specimen. This means there is no interference from out-of-focus light above or below the illuminated plane. Light from the specimen is focused by an objective lens positioned above and passes through a filter and a tube lens to a camera, which records the image. The specimen is moved stepwise vertically through the light sheet, and the resultant stack of images is used to construct a three-dimensional picture of the object, with micrometre resolution. Specimens are prepared by various fluorescent staining techniques, and fluorescence is thus confined to the illuminated plane. Solid specimens are first subject to a clearing process to make them transparent.

单词	ultramicroscope
释义	ultramicroscope Physics A form of microscope that uses the Tyndall effect to reveal the presence of particles that cannot be seen with a normal optical microscope. Colloidal particles, smoke particles, etc., are suspended in a liquid or gas in a cell with a black background and illuminated by an intense cone of light that enters the cell from the side and has its apex in the field of view. The particles then produce diffraction-ring systems, appearing as bright specks on the dark background. Chemistry A form of microscope that uses the Tyndall effect to reveal the presence of particles that cannot be seen with a normal optical microscope. Colloidal particles, smoke particles, etc., are suspended in a liquid or gas in a cell with a black background and illuminated by an intense cone of light that enters the cell from the side and has its apex in the field of view. The particles then produce diffraction-ring systems, appearing as bright specks on the dark background. Biology A form of microscope that uses a sheet of laser light projected from either side to illuminate a thin horizontal plane through a specimen. This means there is no interference from out-of-focus light above or below the illuminated plane. Light from the specimen is focused by an objective lens positioned above and passes through a filter and a tube lens to a camera, which records the image. The specimen is moved stepwise vertically through the light sheet, and the resultant stack of images is used to construct a three-dimensional picture of the object, with micrometre resolution. Specimens are prepared by various fluorescent staining techniques, and fluorescence is thus confined to the illuminated plane. Solid specimens are first subject to a clearing process to make them transparent.
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