Herpesviridae (Herpes Simplex Virus 1 and 2)

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Herpes Simplex viruses 1 and 2

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  HUMAN HERPESVIRUSES Ø   Infect only humans. Ø   Herpesviridae family contains enveloped , double-stranded DNA viruses with large complex genomes. Ø   They replicate in the nucleus of a wide range of vertebrate hosts. ·        Of the more than 100 known herpesviruses, 8 routinely I.          STRUCTURE OF HERPESVIRUSES Ø   The herpes viruses are large, enveloped viruses that contain double-stranded DNA. Ø   The virion is 150 nm in diameter. Ø   The DNA core is surrounded by an icosadeltahedral capsid containing 162 capsomeres. Ø   This capsid is enclosed by a glycoprotein-containing envelope. Ø   Encode several glycoproteins for viral attachment, fusion, and for escaping immune control. Ø   As enveloped viruses, the herpesviruses are sensitive to acid, solvents, detergents, and drying. II. ...
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Terminologies in microscopy

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  TERMINOLOGIES IN MICROSCOPY 1.       Reflection: when a beam of light strikes the smooth surface of a non-transparent material (e.g., the Polished surface of a mirror), it is bounced back, i.e., reflected. The return of light or sound waves from a surface.   2.      Refraction: when a beam of light strikes a smooth interface separating two transparent media (e.g. air and glass; air and water; glass and water), it is partly reflected and partly transmitted, i.e., refracted, into the second medium.                      Reflection and refraction of light would help us in understanding the principles of microscopy. 3.       Lens:             A lens is an optical system with two refracting surfaces. There are two categories of lenses Ø             Convergin...
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Hepatitis A virus

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  1.      HEPATITIS A VIRUS ·        HAV causes infectious hepatitis ·        Spread by the fecal-oral route . ·        Result from consumption of contaminated water, shellfish, or other food. ·        Picornavirus - a new genus Hepa rna virus ·        Long incubation period - 15 to 40 days . Mode of Transmission ·        Sure, here are the rephrased sentences: ·        Contaminated water, food, and unclean hands are common means of virus transmission. ·        The virus is excreted in significant quantities through feces and is primarily disseminated through the fecal-oral route. ·        Shellfish, particularly clams, oysters, and mussels, serve as significant sources of t...
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