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A colony of green planktonic algae Volvox under the dark field microscope. Image Credit: D. Kucharski K. Kucharska/Shutterstock.com

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The images usually appear as bright white against a dark background, regardless of the color of the sample. Pigments in specimens are viewed as false colors, in that the color they are depicted as in the image does not accurately reflect the actual color of the object.

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Finally, dark field microscopy requires no particular set-up or expensive equipment and a light microscope can be converted into a dark field microscope with minimal additional costs.

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Sekine, R., Moore, K., Matzke, M., Vallotton, P., Jiang, H., Hughes, G., Kirby, J., Donner, E., Grovenor, C., Svendsen, C. and Lombi, E. (2017) Complementary Imaging of Silver Nanoparticle Interactions with Green Algae: Dark-Field Microscopy, Electron Microscopy, and Nanoscale Secondary Ion Mass Spectrometry. ACS Nano, 11(11), pp.10894-10902. https://pubs.acs.org/doi/full/10.1021/acsnano.7b04556

While there are numerous essential benefits of dark field microscopy, it is not without its limitations. When visualizing wet specimens of live organisms, it is essential to do this rapidly to ensure that movement does not interfere with the quality of the image.

Dark field microscopy can often image samples unsuitable for conventional bright microscopy. Compared with bright field microscopy, dark field obtains greater resolutions, thus imaging samples in greater detail.

Dark field microscopy is a technique invented in 1830 for the observation of living, unstained cells and microorganisms. This type of microscopy requires intense illumination of the sample within a dark surrounding, making it appropriate for studying particular samples. While its limitations have seen it fall behind more modern microscopy methods, in recent years, it has gained popularity as scientists have begun to use it alongside other methods.

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The intensity of light required for dark field microscopy can also lead to glare and distortion. These issues also make the technique unreliable in obtaining specimen measurements.

Moore, Sarah. "The Benefits and Limitations of Dark Field Microscopy". AZoOptics. https://www.azooptics.com/Article.aspx?ArticleID=2335. (accessed December 19, 2024).

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Moore, Sarah. "The Benefits and Limitations of Dark Field Microscopy". AZoOptics. 19 December 2024. .

Dark field microscopy differs from conventional microscopy, producing different styles of images that lend themselves to different applications. Not all applications of conventional microscopy apply to dark field microscopy, and not all applications of dark field microscopy work as well with conventional techniques.

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C Robert Bagnall. (2012) Dark Field Microscopy [Online]. UCI Department of Chemistry. Available at: https://www.chem.uci.edu/~dmitryf/manuals/Fundamentals/Dark%20Field%20microscopy.pdf (Last accessed October 2022).

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As a result, viewing aquatic organisms with refractive indices similar to the surrounding water has become a standard sample studied with dark field microscopy. Other biological samples make ideal candidates for this method, such as bacteria, tissue cultures, yeast, and others. Non-biological samples suitable for study with dark force microscopy include chemical and mineral crystals and thin segments of polymers.

Moore, Sarah. 2022. The Benefits and Limitations of Dark Field Microscopy. AZoOptics, viewed 19 December 2024, https://www.azooptics.com/Article.aspx?ArticleID=2335.

Another significant benefit of dark field microscopy is that no sample preparation is required (e.g., no staining), which reduces the time demands of the process.

Moore, Sarah. (2022, October 19). The Benefits and Limitations of Dark Field Microscopy. AZoOptics. Retrieved on December 19, 2024 from https://www.azooptics.com/Article.aspx?ArticleID=2335.

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As a result, dark field microscopes have become an established tool in microbiology laboratories for use in various applications, including the visualization of clinical samples of spirochetes (e.g., Treponema palladium [syphilis], Borrelia burgdorferi [lyme borreliosis], and Leptospira interrogans [leptospirosis]), the observation of microbial motility (e.g., visualizing the tufts of bacterial flagella), and viewing the internal structure of eukaryotic microorganisms (e.g., algae and yeast).

Instead of passing through the specimen, as with other forms of microscopy, in dark field, the light is reflected by particles on the slide. Light is directed so that it passes through the condenser’s outer edge at a wide angle and hits the specimen at an oblique angle.

While dark field microscopy has been around for over a century, its limitations have hindered its ability to keep up with the vast advances in alternative microscopy techniques, such as phase contrast and differential interference contrast (DIC) microscopy. For this reason, the technique is not commonly used in modern imaging. However, it has been increasingly combined with modern methods such as fluorescence microscopy in recent years.

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Disclaimer: The views expressed here are those of the author expressed in their private capacity and do not necessarily represent the views of AZoM.com Limited T/A AZoNetwork the owner and operator of this website. This disclaimer forms part of the Terms and conditions of use of this website.

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Finally, specimens must be thin. Dense samples can negatively impact the contrast and accuracy of images produced. For this reason, not all samples are appropriate for dark field imaging.

Dark field microscopy is most useful when researchers need to visualize unstained, transparent specimens. As a general rule, specimens appropriate for viewing with dark field microscopy should have a reflective index similar to the surroundings. Such a refractive index makes a sample unsuitable for viewing with conventional bright field microscopy.

In dark field microscopy, an opaque disk is placed beneath the condenser lens, ensuring that only light scattered from the specimen is allowed to reach the eye.

Oliviero, F., Punzi, L. (2022) Basics of Polarized Light Microscopy. In: Mandell, B.F. (eds) Synovial Fluid Analysis and The Evaluation of Patients With Arthritis. Springer, Cham. https://doi.org/10.1007/978-3-030-99612-3_9

Next, the samples must be exposed to intense illumination, which can cause damage to the sample depending on what is being imaged.

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Dark field microscopy also generates an improved image contrast vs bright field microscopy without the need to stain samples, thus, not killing cells.

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Further limitations of dark field microscopy include its sensitivity to contaminants. Specimen slides must be meticulously cleaned to ensure that dust and dirt are eliminated from the area and such contamination can distort the images produced.

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After studying Psychology and then Neuroscience, Sarah quickly found her enjoyment for researching and writing research papers; turning to a passion to connect ideas with people through writing.