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Transmission Electron MicroscopyThe source of illumination in a TEM is a tungsten filament that emits electrons. A vacuum is created to prevent the collision of electrons with anything else except the specimen. The electron beam is focused by different electromagnetic coils (lenses). First electrons are collected and focused in an electromagnetic 'condenser' lens and then they are collected again by an 'objective' lens. The electromagnetic objective lens produces a magnified image of the object which is received by 'ocular or projection' lens. The final image is formed either on a photographic plate or on a phosphorescent screen. The image results from differential scattering of electrons from molecular constituents of the cell.If you compare the functioning of a TEM with a LM, you will observe that while there are many similarities between a LM and a TEM. there are also many differences. The image formation in a LM depends on the degree of light absorption whereas in a TEM it depends on electron scattering. The lenses of LMs are glass lenses and focusing is done by moving them nearer or farther away from the specimen. In TEMs all the lenses are electromagnetic coils and focusing is done by manipulating the amount of current flowing through the magnetic coils. The final image in a LM is seen by the eye whereas in a TEM it is formed on a phosphorescent screen.
Fast Response - Biological Responses Some of the fast responses are discussed below: It was found that when mung bean root tips were kept in a specific solution (contain
Total Arterial Re-vascnlarisation : In total arterial re-vascularisalion (TAR) end of the right internal mammary artery (RIMA) or radial arlery (RA) is anastomosed to the side of
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For Dalmation dog, the spotted condition is dominant to non-spotted. a) Using a Punnet square, show a cross between two heterozygous parents. b) A spotted female Dalmation dog is m
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The Alanine cycle Follow the alanine link in the alanine cycle. The process goes as under: 1) Pyruvate formed from glycolysis in the muscle is converted to alanine by t
The disease has a high morbidity and low mortality Genital disease: Affected cow develop fever, depression and stand apart, with tail held away from vulva, urination is freq
What are plant organs responsible for the perception of light variation? And what is the pigment responsible for this perception? The Leaves are mostly responsible for percepti
give the discriptive account of nerilla which belongs to class arciannelida in phylum annelida
Archaeological data provide valuable information about the uses of plants in the past. Information comes from a number of sources, including fossil plant and human remains as well
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