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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.
a) Explain what is meant by ovulation. b) How often does it happen in humans? (a) Ovulation is the release of an ovum from a mature follicle in the ovary.
What are melanocytes? Melanocytes are epithelial cells of the skin particular in secretion of melanin. Melanin is a pigment that besides coloring the skin, the iris of the eye
How can Prevent the Symptoms Associated With Food Intolerance? Taking a few simple steps can help prevent the symptoms associated with food intolerance. These steps include:
Q. How is the depolarization of the neuronal plasma membrane generated? How does the cell return to its original rest? When the neuron receives a stimulus by the permeability o
Initiation Codon is the codon at which the translation of a polypeptide chain is initiated. This is generally the first AUG triplet in the mRNA molecule from 5' end, where the rib
The fact that some pure solutions of hydrocarbons do not readily evaporate at room temperature is a result of Select one: a. London dispersion forces. b. The hydrophobic effe
B a b e s i o s i s It is also known as red water disease or cattle tick fever and is characterized by fever, intravascular haemolysis, acute anaemia and haemoglobinur
characteristics of the Nematoda
Benefits of energy pyramids
History Past and present history of cardiovascular problems of patient & family. History of chest pain, shortness of breath, fatigue, abnormal skin colour, dizziness, vertigo
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