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Marine viruses are defined by their habitat as viruses that are found in marine environments, that is, in the saltwater of seas or oceans or the brackish water of coastal estuaries. Viruses are small infectious agents that can only replicate inside the living cells of a host organism , because they need the replication machinery of the host to ...
The tiny (0.6 μm) marine cyanobacterium Prochlorococcus, discovered in 1986, forms today an important part of the base of the ocean food chain and accounts for much of the photosynthesis of the open ocean [140] and an estimated 20% of the oxygen in the Earth's atmosphere. [141]
Phycodnaviridae is a family of large (100–560 kb) double-stranded DNA viruses that infect marine or freshwater eukaryotic algae.Viruses within this family have a similar morphology, with an icosahedral capsid (polyhedron with 20 faces).
Members of the phylum are also known as the nucleocytoplasmic large DNA viruses (NCLDV), which serves as the basis of the name of the phylum with the suffix - viricota for virus phylum. These viruses are referred to as nucleocytoplasmic because they are often able to replicate in both the host's cell nucleus and cytoplasm .
The virus, later named the Skeletonema costatum DNA virus (ScDCV), was found to have an icosahedral capsid and a double-stranded DNA genome. [16] Subsequently, after the discovery of Skeletonema costatum DNA virus (ScDCV), another Diatom virus was isolated and characterized as the Chaetoceros setoensis DNA Virus (CsetDNAV), which was found to ...
Orthopoxvirus particles. A DNA virus is a virus that has a genome made of deoxyribonucleic acid (DNA) that is replicated by a DNA polymerase.They can be divided between those that have two strands of DNA in their genome, called double-stranded DNA (dsDNA) viruses, and those that have one strand of DNA in their genome, called single-stranded DNA (ssDNA) viruses. dsDNA viruses primarily belong ...
The viruses have large, double-stranded DNA genomes (300 to >1000 kilobasepairs) that encode a large contingent of genes (of the order of 1000 genes). [ 3 ] [ 5 ] The best characterized giant viruses are the phylogenetically related mimivirus and megavirus , which belong to the family Mimiviridae (aka Megaviridae ), and are distinguished by ...
The origin of viruses is unclear because they do not form fossils, so molecular techniques have been used to compare the DNA or RNA of viruses and are a useful means of investigating how they arise. [107] Viruses are now recognised as ancient and as having origins that pre-date the divergence of life into the three domains. [108]