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The design described here is for a standard upright compound light microscope. Another design commonly used, especially when observing living cells, is the inverted microscope. The difference is in where the objectives sit, where the light source is, and which parts of the microscope move to bring the image into focus. In the conventional upright microscope (as in Figure 1), the objectives are attached to a nosepiece on the microscope body above the stage, the sample is illuminated from below, and the focus controls move the stage up and down to bring the image to its proper location of focus relative to the eyepiece. In inverted designs, the stage itself is fixed and the objectives are below the stage, in an inverted position. The sample is illuminated from above and the focus controls move the objectives up and down to focus the image in the eyepiece. Having a fixed stage allows better access to the specimen in circumstances where the specimen needs to be manipulated while being observed (such as microinjection) (Murphy and Davidson, 2012).

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Condenser: Condenses the light from the base illumination and focuses it onto the stage. The condenser has an iris diaphragm (a circular opening where light can pass through), which can be adjusted to match the effective numerical aperture of each objective lens. To open and close the iris diaphragm, the condenser ring can be rotated so that the amount of light permitted through matches the requirements of the objective in use.

Dark-field microscopy describes microscopy methods, in both light and electron microscopy, which exclude the unscattered beam from the image.

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Figure 1. Labeled parts of a microscope (Adapted from Thebiologyprimer, 2014 Wikimedia Commons / Public Domain https://commons.wikimedia.org/wiki/File:Parts_of_a_Microscope_(english).png)

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Stage adjustment: Adjusts the position of the mechanical stage horizontally in the X and Y plane, in order to position the slide so that a portion of the specimen is under the objective.

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Objective lenses: There are usually 3-5 optical lens objectives on a compound microscope, each with different magnification levels – most commonly 4x, 10x, 40x, and 100x. The total magnification of a compound microscope is calculated by multiplying the objective lens magnification by the eyepiece magnification level. So, a compound microscope with a 10x eyepiece magnification looking through the 40x objective lens has a total magnification of 400x (10 x 40).

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A simple microscope is really nothing more than a magnifying glass, where a convex lens is used to magnify an image. A compound microscope, on the other hand, uses a minimum of two magnifying lenses or lens arrays, called the objective and the eyepiece (BIO1000F practical manual, 2017; Encyclopædia Britannica, 2019).

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Cytogenetics is just one of many applications of the microscope in the biology laboratory. Whether it is used for identifying cells and tiny organisms, or to study the organisation and processes within cells through live-cell imaging, there is no doubt that bright field microscopy has advanced the life sciences over the past decades. With increasing sophistication and technology, this technique promises to stay central to the study of life.

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Light (or Illumination): The light used to illuminate the specimen from the base of the microscope. Low voltage halogen bulbs or LED are the most commonly used sources of illumination for compound microscopes.

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Microscopy is used to visualize objects that are too small to see with the naked eye. In biology, this technique enables us to examine things like bacteria and cells at a magnification of up to 10000 times their original size (BIO1000F practical manual, 2017). In light microscopy, visible light is used to detect such small objects – with bright field microscopy being the most common form of light microscopy. In bright field microscopy, the image you see is formed mainly by the absorption of light by the specimen (for example a cell) (Lackie, 2010).

Fine and coarse adjustment controls: Adjust the focus of the microscope by moving the stage vertically. The coarse adjustment knob is moved to its highest position stop (forward rotation). The fine adjustment knob is used to bring the image into sharp focus.

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Because light needs to travel through it, the material you observe with the compound microscope must be very small, transparent, or cut in a thin section. Preparing specimens for viewing under the upright compound microscope involves placing them on a glass slide in a mounting medium, such as water or glycerine. A coverslip is then placed over the specimen to protect the lens from the mounting medium and to flatten the specimen slightly. Throughout the wet mount specimen preparation, care should be taken to minimize obstructions (like debris or bubbles) in the light path. The idea is to create as clear as possible, a path for the light to travel through. Here follows a protocol for preparing a wet mount:

With the inverted microscope, living cells can be observed in their culture dishes with medium on the microscope stage. This is called live-cell imaging and it enables the observer to monitor a variety of dynamic intracellular events over time. Because the inverted microscope has a fixed stage onto which culture dishes or flasks can be viewed, no special specimen preparation is necessary. Live-cell imaging often makes use of fluorescent labeling to help the observer distinguish cellular structures and processes (Murphy and Davidson, 2012).

Eyepiece (or ocular): The part that you looked through at the top of the compound microscope. Eyepieces typically have ocular lenses with magnification between 5x and 30x. Many microscopes are fitted with foldable rubber eye guards that can help minimize ambient light.

Nosepiece: Holds the objective lenses and attaches them to the microscope head. The nosepiece rotates to change which objective lens is in the working position.

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Bright-field microscopy allows one to observe the development, organization, and function of unicellular and higher organisms and to study structures and mechanisms at cellular and subcellular levels (Periasamy, 2014). A common application of the upright compound light microscope is in cytogenetics i.e. the study of chromosomes. As an example, the steps and materials used to prepare and observe metaphase chromosome spreads of a marine mollusc is described below (based on Van der Merwe and Roodt-Wilding, 2008):

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Light intensity control: Knob is used to adjust the amount of light that reaches the specimen or slide from the base illumination.

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The coordinated system of lenses is arranged in such a way that a magnified image of a specimen can be viewed with increased resolution and contrast. Resolution is how well one can distinguish between two points on a specimen – the better the resolution, the sharper the image. Resolution is a function of the microscope, its lens design and source of radiation. Contrast, on the other hand, is the difference in intensity perceived between different parts of an image. Histological stains that bind selectively to different parts of the specimen can enhance the contrast of an image (BIO1000F practical manual, 2017; Lackie, 2010). Contrast is thus mainly dependent on intrinsic qualities of the specimen and how it was prepared for microscopy.

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The typical upright compound microscope consists of the following parts (see figure 1, from the bottom up) (BIO1000F practical manual, 2017; New York Microscope Company, 2019):

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In a standard bright field microscope, light travels from the source of illumination through the condenser, through the specimen, through the objective lens, and through the eyepiece to the eye of the observer. Light thus gets transmitted through the specimen and it appears against an illuminated background. The observer can see objects in the light path because natural pigmentation or stains absorb light differentially, or because they are just thick enough (but not too thick) to absorb a significant amount of light despite being colorless (Caprette, 2012; New York Microscope Company, 2019).

Specimens are often stained to enhance contrast. When this applies, the specimen or tissue can either be stained before it is mounted on the slide, or the stain can be added to the mounting medium.

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Light microscopy has become one of the most widely used methods in the life sciences since the invention of the microscope in the 1670s by Antoni van Leeuwenhoek. Soon after the first microscope was built, a host of biological specimens (including protozoa, bacteria, spermatozoa, and red blood) were observed and described (Periasamy, 2014). Nowadays, no biological laboratory is complete without a microscope

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