Search results
Results From The WOW.Com Content Network
Viruses were expected to be small, but the range of sizes came as a surprise. Some were only a little smaller than the smallest known bacteria, and the smaller viruses were of similar sizes to complex organic molecules. [14] In 1935, Wendell Stanley examined the tobacco mosaic virus and found it was mostly made of protein. [15]
The rare epidemics of viral diseases originating in animals would have been short-lived because the viruses were not fully adapted to humans [15] and the human populations were too small to maintain the chains of infection. [16] Other, more ancient, viruses have been less of a threat.
Western Hemisphere populations were ravaged mostly by smallpox, but also typhus, measles, influenza, bubonic plague, cholera, malaria, tuberculosis, mumps, yellow fever, and pertussis. The lack of written records in many places and the destruction of many native societies by disease, war, and colonization make estimates uncertain.
One way that viruses have been able to spread is with the evolution of virus transmission. The virus can find a new host through: [32] Droplet transmission: the virus is spread to a new host through bodily fluids (an example is the influenza virus) [33] Airborne transmission: the virus is passed on through the air (an example is viral ...
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 ...
In 2009, new changes to local government were made whereby a number of new unitary authorities were created in areas which previously had a 'two-tier' system of counties and districts. In five shire counties the functions of the county and district councils were combined into a single authority; and in two counties the powers of the county ...
The findings, published in a series of articles in Current Archaeology, come from one of the largest ancient DNA projects in Europe involving 460 people who were buried in graves between 200AD and ...
Gamma phage, an example of virus particles (visualised by electron microscopy) Virology is the scientific study of biological viruses.It is a subfield of microbiology that focuses on their detection, structure, classification and evolution, their methods of infection and exploitation of host cells for reproduction, their interaction with host organism physiology and immunity, the diseases they ...