Brent Cornell. Cell Introduction 2. Cell Structure 3. Membrane Structure 4. Membrane Transport 5. Origin of Cells 6. Cell Division 2: Molecular Biology 1. Metabolic Molecules 2. Water 3. Protein 5. Enzymes 6. Cell Respiration 9. Photosynthesis 3: Genetics 1. Bring the slide back into focus using the fine focus adjustment. If you do not succeed, go back to low power and re-focus, then try again. Record the microscope images using labelled diagrams or produce digital images.
When first examining cells or tissues with low power, draw an image at this stage, even if going on to examine the slide with high power. A low power diagram is used:. This is a myth. Relax and have confidence that you have the ability to create a representational sketch. Remember, an eraser it all it takes to make improvements to your drawing.
As you gain confidence, experiment with smaller and larger size paper, different weights or consider purchasing a sketch notebook.
These supplies will provide you with the general tools to experiment. If you prefer soft graphite, purchase different ranges of B pencils. Iif you want more vibrant colors, consider oil-based colored pencils. How to sketch a microscope slide will feel less overwhelming breaking down the drawing process. First, to represent the microscope field of view, draw a circle on the page — this can be freehand or, if you want to be precise, use a compass.
If you are using a graticule slide a microscope slide with millimeter grid lines , lightly sketch a grid over your circle. Alternatively, draw light lines to separate the circle into a four equal quadrants. The quadrants will help you estimate the geographic location, proportion and relative size of objects in the view field.
In addition, note the specimen, date, mounting technique, magnification and other related information in the bottom corner of your paper. Establishing a habit of labeling your drawings while discovering how to sketch a microscope slide will enable you to keep your drawing organized. When you look at your sample, remember that the negative space or empty area is just as important as the object itself.
The negative space forces your brain to see the object as abstract, breaking down shapes more accurately. Your brain may tell you the specimen is a rectangle with a circular nucleus, but what you actually see likely different. Learning how to observe a sample is just as important as how to sketch a microscope slide.
Once you learn to see, you can draw. TEM electron micrograph of a plant cell showing key features. When producing a biological drawing, it is vital that you only ever draw what you see and not what you think you see. To accurately reflect the size and proportions of structures you see under the microscope, you should get used to using the eyepiece graticule.
You should be able to describe and interpret photomicrographs, electron micrographs and drawings of typical animal cells. Cell Structure 2. Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they allow for tissues, cells and organelles to be seen and studied For example, the movement of chromosomes during mitosis can be observed using a microscope When using an optical microscope always start with the low power objective lens : It is easier to find what you are looking for in the field of view This helps to prevent damage to the lens or coverslip incase the stage has been raised too high A graticule must be used to take measurements of cells: A graticule is a small disc that has an engraved scale.
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