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Scanning Electron Microscopy (SEM)While 'TEM is useful to study the internal structul-c of thc ccll. SEM is an important technique if you wish to examine the surl'ace features of the specimen. Moreover, a specimen can be viewed at different angles. The resolving power of a SEM is lower than that of a TEM since a resolution of only about 3.0 nm can be attained hy SEM.In a SEM, a low energy beam of electrons (primary electrons) strikes the surface of a specimen. This causes the emission of the secondar!, electrons from the specimen which are gathered by a photonlultiplier tube to form an image which is built up line by line as in the case of television. The image forlncci by SEM has a three-dimensional appearance. Unlike -in a TEM, the electrons in a SEM do not pass through the specimen.
What are cell movements? How are these movements created? Cell movements are movements done by cell structures, like the movements of cilia and flagella, the pseudopod movement
Crustacea The Crustacea show a great morphological diversity of appendages which may be grouped into three categories, cephalic, thoracic and abdominal. Their appendages are c
The water on earth surface constitutes hydrosphere. About 75% of earth surface is covered with water and 97% of that water is present in oceans, which is very salty. We are only
Q. What are the steroids? What are the few examples of steroids with a biological function? Steroids are lipids based in an angular combination of four carbon rings, one ring m
Q. What is Aflatoxin? Aflatoxins are the most widely studied of all mycotoxins. Knowledge of their existence dates from 1960, when more than 100,000 turkey died in England afte
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Q What is signifying by binomial nomenclature and what are its basic rules? Scientific nomenclature of a species must have at least two names one that classifies it as genus an
What are risk factors for diseases? Risk factors for a disease are everything that contributes to enhance the risk of the disease to appear. For instance, for most cardiovascul
What are the Maximum Crop Yields Mitscherlich conducted a large number of experiments with different plants, making use of pots 20 cm in diameter and 20 cm in depth. By addin
How emulsion are formed The most common method of preparing an emulsion is by mechanically dispersing one liquid phase in another by formation of small droplets. This takes pla
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