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  2. History of virology - Wikipedia

    en.wikipedia.org/wiki/History_of_virology

    The pandemic killed 40–50 million people in less than a year, [48] but the proof that it was caused by a virus was not obtained until 1933. [49] Haemophilus influenzae is an opportunistic bacterium which commonly follows influenza infections; this led the eminent German bacteriologist Richard Pfeiffer (1858–1945) to incorrectly conclude ...

  3. Non-cellular life - Wikipedia

    en.wikipedia.org/wiki/Non-cellular_life

    Non-cellular life, also known as acellular life, is life that exists without a cellular structure for at least part of its life cycle. [1] Historically, most definitions of life postulated that an organism must be composed of one or more cells, [2] but, for some, this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements.

  4. Virus crystallisation - Wikipedia

    en.wikipedia.org/wiki/Virus_Crystallisation

    Whether or not viruses are ‘alive’ is a subject of heavy debate across the world. While viruses exhibit some behaviours that can be characterized as 'alive', such as their ability to replicate and evolve, they lack certain essential features typically associated with life, such as cellular structure and independent metabolism. [25]

  5. Half alive, half dead and very small: What makes viruses so ...

    www.aol.com/half-alive-half-dead-very-184810066.html

    Viruses are among the biggest threats to humanity, with the current pandemic showing how these pathogens can shut down countries, halt entire industries and cause untold human suffering as they ...

  6. Viruses and bacteria have similarities, but the ways we ... - AOL

    www.aol.com/viruses-bacteria-similarities-ways...

    Not all viruses are harmful, and many don’t infect humans. But ones that do cause can cause COVID, flu, hepatitis, shingles, herpes, measles, colds and many other illnesses.

  7. Paleovirology - Wikipedia

    en.wikipedia.org/wiki/Paleovirology

    Paleovirology is the study of viruses that existed in the past but are now extinct. In general, viruses cannot leave behind physical fossils, [1] therefore indirect evidence is used to reconstruct the past. For example, viruses can cause evolution of their hosts, and the signatures of that evolution can be found and interpreted in the present ...

  8. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    Whether or not viruses should be considered as alive is controversial. [ 33 ] [ 34 ] They are most often considered as just gene coding replicators rather than forms of life. [ 35 ] They have been described as "organisms at the edge of life" [ 36 ] because they possess genes , evolve by natural selection, [ 37 ] [ 38 ] and replicate by making ...

  9. Virus - Wikipedia

    en.wikipedia.org/wiki/Virus

    When not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent viral particles, or virions, consisting of (i) genetic material, i.e., long molecules of DNA or RNA that encode the structure of the proteins by which the virus acts; (ii) a protein coat, the capsid, which surrounds and protects the ...