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- Introduction_to_viruses abstract "A virus is a biological agent that reproduces inside the cells of living hosts. When infected by a virus, a host cell is forced to produce many thousands of identical copies of the original virus, at an extraordinary rate. Unlike most living things, viruses do not have cells that divide; new viruses are assembled in the infected host cell. But unlike still simpler infectious agents, viruses contain genes, which gives them the ability to mutate and evolve. Over 5,000 species of viruses have been discovered.The origins of viruses are unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria. A virus consists of two or three parts: genes, made from either DNA or RNA, long molecules that carry genetic information; a protein coat that protects the genes; and in some viruses, an envelope of fat that surrounds and protects them when they are not contained within a host cell. Viruses vary in shape from the simple helical and icosahedral to more complex structures. Viruses range in size from 20 to 300 nanometres; it would take 30,000 to 750,000 of them, side by side, to stretch to 1 centimetre (0.39 in).Viruses spread in many different ways. Just as many viruses are very specific as to which host species or tissue they attack, each species of virus relies on a particular method for propagation. Plant viruses are often spread from plant to plant by insects and other organisms, known as vectors. Some viruses of animals, including humans, are spread by exposure to infected bodily fluids. Viruses such as influenza are spread through the air by droplets of moisture when people cough or sneeze. Viruses such as norovirus are transmitted by the faecal–oral route, which involves the contamination of hands, food and water. Rotavirus is often spread by direct contact with infected children. The human immunodeficiency virus, HIV, is transmitted by bodily fluids transferred during sex. Others, such as the Dengue virus, are spread by blood-sucking insects.Viral infections can cause disease in humans, animals and even plants. However, they are usually eliminated by the immune system, conferring lifetime immunity to the host for that virus. Antibiotics have no effect on viruses, but antiviral drugs have been developed to treat life-threatening infections. Vaccines that produce lifelong immunity can prevent some viral infections.".
- Introduction_to_viruses colourName "violet".
- Introduction_to_viruses thumbnail Rotavirus_Reconstruction.jpg?width=300.
- Introduction_to_viruses wikiPageID "14579421".
- Introduction_to_viruses wikiPageRevisionID "604969504".
- Introduction_to_viruses by "no".
- Introduction_to_viruses color "violet".
- Introduction_to_viruses hasPhotoCollection Introduction_to_viruses.
- Introduction_to_viruses imageCaption "Computer reconstruction of a rotavirus particle".
- Introduction_to_viruses label "Virus".
- Introduction_to_viruses lcheading "Viruses".
- Introduction_to_viruses name "Viruses".
- Introduction_to_viruses onlinebooks "yes".
- Introduction_to_viruses subdivision "I: dsDNA viruses".
- Introduction_to_viruses subdivision "II: ssDNA viruses".
- Introduction_to_viruses subdivision "III: dsRNA viruses".
- Introduction_to_viruses subdivision "IV: (+)ssRNA viruses".
- Introduction_to_viruses subdivision "V: (-)ssRNA viruses".
- Introduction_to_viruses subdivision "VI: ssRNA-RT viruses".
- Introduction_to_viruses subdivision "VII: dsDNA-RT viruses".
- Introduction_to_viruses subdivisionRanks "Groups".
- Introduction_to_viruses subject Category:Virology.
- Introduction_to_viruses subject Category:Viruses.
- Introduction_to_viruses type Agent109190918.
- Introduction_to_viruses type CausalAgent100007347.
- Introduction_to_viruses type InfectiousAgent109312843.
- Introduction_to_viruses type LivingThing100004258.
- Introduction_to_viruses type Microorganism101326291.
- Introduction_to_viruses type Object100002684.
- Introduction_to_viruses type Organism100004475.
- Introduction_to_viruses type PhysicalEntity100001930.
- Introduction_to_viruses type Virus101328702.
- Introduction_to_viruses type Viruses.
- Introduction_to_viruses type Whole100003553.
- Introduction_to_viruses type Species.
- Introduction_to_viruses type Organism.
- Introduction_to_viruses comment "A virus is a biological agent that reproduces inside the cells of living hosts. When infected by a virus, a host cell is forced to produce many thousands of identical copies of the original virus, at an extraordinary rate. Unlike most living things, viruses do not have cells that divide; new viruses are assembled in the infected host cell. But unlike still simpler infectious agents, viruses contain genes, which gives them the ability to mutate and evolve.".
- Introduction_to_viruses label "Introduction to viruses".
- Introduction_to_viruses label "Introdução aos vírus".
- Introduction_to_viruses label "مدخل إلى الفيروسات".
- Introduction_to_viruses sameAs Εισαγωγή_στους_ιούς.
- Introduction_to_viruses sameAs Introdução_aos_vírus.
- Introduction_to_viruses sameAs m.03d8hy6.
- Introduction_to_viruses sameAs Q59075.
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- Introduction_to_viruses sameAs Introduction_to_viruses.
- Introduction_to_viruses wasDerivedFrom Introduction_to_viruses?oldid=604969504.
- Introduction_to_viruses depiction Rotavirus_Reconstruction.jpg.
- Introduction_to_viruses isPrimaryTopicOf Introduction_to_viruses.
- Introduction_to_viruses name "Viruses".