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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.
Q. What are the "chiasms" of homologous chromosomes observe in prophase I? Chiasms are intersections of two tracts in the form of X, The chiasms seen in prophase I are chromoso
Cell Interactions and Ooplasmic Determinants Microscopic observations of egg cytoplasm suggests that it is not homogenous in appearance. The observable variations in the cytop
Q. What is the chemical equation of photosynthesis? The chemical equation of photosynthesis is given below: 6 CO 2 + 6 H 2 O + light --> C 6 H 12 O 6 + 6 O 2
Pericardial Effusion: Indications for Surgery: Pericardial effusion may be the result of peiicarditis due to infection, autoimmune disease or neoplasm. Non-inflammatoly diseases
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Adenine is one of the four nitrogen-containing bases occurring in the nucleotides, the building blocks of organic macromolecule group called as nucleic acids (DNA and RNA). Adenin
Which of the following results from the elimination of DNA ligase activity in a cell? A. The oligonucleotide primers will not be removed from the genome - as they often contain
Q. Define Radiological anatomy? The borders of the mediastinum on the CXR are defined by the contrast produced by adjacent air filled lung. Postero-Anterior View It in
M a s s a g i n g and tumbling techniques To improve the desirable characteristics of meat products massaging and tumbling techniques were developed. Massaging involves
Explain Complex or Undefined Media? Here, the exact composition of the medium is not known. It contains some complex components of plant and animal extracts whose exact chemica
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