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Microscopes and Their Properties

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Termini in questo insieme (20)

  • Light Microscope

    Uses visible light to illuminate specimens. Magnification up to 1000x. Useful for viewing live cells and basic cell structures.

  • Electron Microscope

    Uses electron beams for illumination. Provides much higher resolution than light microscopes, allowing visualization of ultrastructure.

  • Transmission Electron Microscope (TEM)

    Electron microscope that transmits electrons through a thin specimen. Produces detailed 2D images of internal structures.

  • Scanning Electron Microscope (SEM)

    Electron microscope that scans the surface with electrons. Produces detailed 3D images of specimen surfaces.

  • Magnification

    The process of enlarging the appearance of an object. Calculated as the product of the objective lens and ocular lens magnifications.

  • Resolution

    The ability of a microscope to distinguish two close objects as separate. Higher resolution means clearer, more detailed images.

  • Contrast in Microscopy

    Difference in light intensity between the specimen and background. Enhanced by stains or special techniques to improve visibility.

  • Phase-Contrast Microscope

    Enhances contrast in transparent specimens without staining by amplifying differences in refractive index.

  • Fluorescence Microscope

    Uses fluorescent dyes and UV light to visualize specific components of cells with high contrast and specificity.

  • Confocal Microscope

    Uses laser light and optical sectioning to produce sharp 3D images of specimens, reducing out-of-focus blur.

  • Numerical Aperture (NA)

    A measure of a lens's ability to gather light and resolve fine specimen detail at a fixed object distance.

  • Oil Immersion Lens

    Objective lens used with immersion oil to increase resolution by reducing light refraction between the lens and specimen.

  • Depth of Field

    The thickness of the specimen layer that appears in focus at one time under the microscope.

  • Working Distance

    The distance between the objective lens and the specimen when in focus.

  • Brightfield Microscopy

    Standard light microscopy where the specimen appears dark against a bright background.

  • Darkfield Microscopy

    Illuminates specimen with light that does not enter the objective lens directly, making the specimen appear bright on a dark background.

  • Electron Beam Wavelength

    Much shorter than visible light, allowing electron microscopes to achieve higher resolution.

  • Limit of Resolution for Light Microscopes

    Approximately 0.2 micrometers, limited by the wavelength of visible light.

  • Limit of Resolution for Electron Microscopes

    Can be as low as 0.1 nanometers, allowing visualization of molecular structures.

  • Sample Preparation for Electron Microscopy

    Requires fixation, dehydration, and often coating with heavy metals to enhance electron contrast.