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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.
Calculate the pH - microbial survival and growth? Presence of microorganisms also depends on the pH of the medium. Most bacteria grow optimally near neutral pH (optimum 6.5 - 7
features of phylum platyhelminths
Are there different proteins made by the same total number of amino acids? Different proteins with the similar total number of amino acids may exist. In such cases the separati
Define Precautions for preparation of bacterial smear 1. The slide should not be greasy. 2. Hold the slide by their edges only. 3. Label should not come in contact with s
#question.which annelids shws bioluminescence .
What is d excretory organ of the agama lizard
It is found in around 20 per cent cases of ARF and it is a late manifestation occurring even 3 months after GAS pharyngeal infection. Chorea is triggered by emotional disturbances
Q. What is cancer? The Cancers are malign neoplasias that is abnormal and uncontrolled proliferation of cells that can disseminate to other sites of the body. The Cancer dissem
An experiment supported by NASA calculated the heights of 6 men rapidly before going to bed, and then again after 3 days of bed rest. The data were as follows: What is the 95% con
Which are the growth tissues of plants? How do they categorize and where can they be found? The growth tissues of the plants are the meristems. Meristems are the tissues that m
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