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Sphaeroforma Arctica
''Sphaeroforma arctica'', is a unicellular eukaryote with a pivotal position in the tree of life. It was first isolated from the arctic marine amphipod '' Gammarus setosus''. Like other Ichthyosporeans such as ''Creolimax'' and ''Abeoforma'', ''Sphaeroforma arctica'' are spherical cells characterized with their capacity to grow into multi-nucleated coenocytes (multi-nucleates cell). However, a unique feature of ''S. arctica'', is that no obvious budding, hyphal, amoeboid, sporal or flagellated growth stages have been observed in laboratory growth conditions. Taxonomy ''Sphaeroforma'' is a member of the Ichthyosporea clade, which is the earliest branching holozoa Holozoa is a group of organisms that includes animals and their closest single-celled relatives, but excludes fungi. ''Holozoa'' is also an old name for the tunicate genus ''Distaplia''.'' Because Holozoa is a clade including all organisms mor ...n lineage. It is a key organism to understand the origin of anim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phalloidin
Phalloidin belongs to a class of toxins called phallotoxins, which are found in the death cap mushroom ''(Amanita phalloides)''. It is a rigid bicyclic heptapeptide that is lethal after a few days when injected into the bloodstream. The major symptom of phalloidin poisoning is acute hunger due to the destruction of liver cells. It functions by binding and stabilizing filamentous actin (F-actin) and effectively prevents the depolymerization of actin fibers. Due to its tight and selective binding to F-actin, derivatives of phalloidin containing fluorescent tags are used widely in microscopy to visualize F-actin in biomedical research. Discovery and background Phalloidin was one of the first cyclic peptides to be discovered. It was isolated from the death cap mushroom and crystallized by Feodor Lynen and Ulrich WielandG. Semenza, E.C. Slater, R. JaenickeSelected Topics in the History of Biochemistry. Personal Recollections- Google books in 1937. Its structure is unusual in that it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DAPI
DAPI (pronounced 'DAPPY', /ˈdæpiː/), or 4′,6-diamidino-2-phenylindole, is a fluorescent stain that binds strongly to adenine–thymine-rich regions in DNA. It is used extensively in fluorescence microscopy. As DAPI can pass through an intact cell membrane, it can be used to stain both live and fixed cells, though it passes through the membrane less efficiently in live cells and therefore provides a marker for membrane viability. History DAPI was first synthesised in 1971 in the laboratory of Otto Dann as part of a search for drugs to treat trypanosomiasis. Although it was unsuccessful as a drug, further investigation indicated it bound strongly to DNA and became more fluorescent when bound. This led to its use in identifying mitochondrial DNA in ultracentrifugation in 1975, the first recorded use of DAPI as a fluorescent DNA stain. Strong fluorescence when bound to DNA led to the rapid adoption of DAPI for fluorescent staining of DNA for fluorescence microscopy. Its use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sigmund Sperstad
In Norse mythology, Sigmund ( non, Sigmundr , ang, Sigemund) is a hero whose story is told in the Völsunga saga. He and his sister, Signý, are the children of Völsung and his wife Hljod. Sigmund is best known as the father of Sigurð the dragon-slayer, though Sigurð's tale has almost no connections to the Völsung cycle except that he was a dragonslayer. ''Völsunga saga'' In the ''Völsunga saga'', Signý marries Siggeir, the king of Gautland (modern Västergötland). Völsung and Sigmund are attending the wedding feast (which lasted for some time before and after the marriage), when Odin, disguised as a beggar, plunges a sword (Gram) into the living tree Barnstokk ("offspring-trunk"Orchard (1997:14).) around which Völsung's hall is built. The disguised Odin announces that the man who can remove the sword will have it as a gift. Only Sigmund is able to free the sword from the tree. Siggeir is smitten with envy and desire for the sword. He tries to buy it but Sigmund ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steinar Johansen (biologist)
Steinar Kjetil Johansen (born 27 February 1972) is a Norwegian speed skater. He was born in Holmestrand. He competed at the 1992 Winter Olympics in Albertville, at the 1994 Winter Olympics in Lillehammer, and at the 1998 Winter Olympics The 1998 Winter Olympics, officially known as the and commonly known as Nagano 1998 ( ja, 長野1998), was a winter multi-sport event held from 7 to 22 February 1998, mainly in Nagano, Japan, with some events taking place in the ... in Nagano. References External links * 1972 births Living people People from Holmestrand Norwegian male speed skaters Olympic speed skaters of Norway Speed skaters at the 1992 Winter Olympics Speed skaters at the 1994 Winter Olympics Speed skaters at the 1998 Winter Olympics Sportspeople from Vestfold og Telemark 20th-century Norwegian people {{Norway-speed-skating-bio-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bjarne Landfald
Bjarne is a Nordic male name, a variant of Bjorn, and can refer to the following people: *Bjarne Andersson, a cross-country skier *Bjarne Berg-Sæther, a Norwegian politician *Bjarne Berntsen, a Norwegian football coach and former player *Bjarne Brøndbo, a rock singer *Bjarne Brustad, a violinist * B. S. (Bjarne Slot) Christiansen, a team-building coach *Bjarne Mørk Eidem, a Norwegian politician * Bjarne Fjærtoft, a Norwegian politician * Bjarne Flem, a Norwegian politician *Bjarne Goldbæk, a football player and sports pundit * Bjarne Guldager, a Norwegian Olympic sprinter * Bjarne Håkon Hanssen, the current Norwegian Minister of Labour and Social Inclusion * Bjarne Hansen, a comics artist * Bjarne Henriksen, a Danish actor *Bjarne Henry Henriksen, a Norwegian politician *Bjarne Iversen, a cross-country skier * Bjarne Jeppesen, a handball player *Bjarne Johnsen, a Norwegian gymnast *Bjarne Kallis, a Finnish politician *Bjarne Liller, a jazz musician *Bjarne Lyngstad, a Norwe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gammarus Setosus
''Gammarus setosus'' is a gammarid amphipod that inhabits the northern coasts of both the Atlantic and Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the contine ... oceans. Typically, this crustacean is found in the benthic sub-tidal or low inter-tidal regions. ''Gammarus setosus'' reproduces once a year in the autumn. References setosus Crustaceans described in 1931 {{Amphipod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ichthyosporea
The Mesomycetozoea (or DRIP clade, or Ichthyosporea) are a small group of Opisthokonta in Eukaryota (formerly protists), mostly parasites of fish and other animals. Significance They are not particularly distinctive morphologically, appearing in host tissues as enlarged spheres or ovals containing spores, and most were originally classified in various groups as fungi, protozoa, or colorless algae. However, they form a coherent group on molecular trees, closely related to both animals and fungi and so of interest to biologists studying their origins. In a 2008 study they emerge robustly as the sibling-group of the clade Filozoa, which includes the animals. Huldtgren et al., following x-ray tomography of microfossils of the Ediacaran Doushantuo Formation, has interpreted them as mesomycetozoan spore capsules. Terminology The name DRIP is an acronym for the first protozoa identified as members of the group, Cavalier-Smith later treated them as the class Ichthyosporea, since ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holozoa
Holozoa is a group of organisms that includes animals and their closest single-celled relatives, but excludes fungi. ''Holozoa'' is also an old name for the tunicate genus ''Distaplia''.'' Because Holozoa is a clade including all organisms more closely related to animals than to fungi, some authors prefer it to recognizing paraphyletic groups that mostly consists of Holozoa minus animals. Perhaps the best-known holozoans, apart from animals, are the choanoflagellates, which strongly resemble the collar cells of sponges, and so were theorized to be related to sponges even in the 19th century. ''Proterospongia'' is an example of a colonial choanoflagellate that may shed light on the origin of sponges. The affinities of the other single-celled holozoans only began to be recognized in the 1990s. The sub-classification Ichthyosporea or Mesomycetozoea contains a number of mostly parasitic species. The amoeboid genera ''Ministeria'' and ''Capsaspora'' may be united in a group call ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sphaeroforma Arctica (32283675800)
''Sphaeroforma arctica'', is a unicellular eukaryote with a pivotal position in the tree of life. It was first isolated from the arctic marine amphipod ''Gammarus setosus''. Like other Ichthyosporeans such as ''Creolimax'' and ''Abeoforma'', ''Sphaeroforma arctica'' are spherical cells characterized with their capacity to grow into multi-nucleated coenocytes (multi-nucleates cell). However, a unique feature of ''S. arctica'', is that no obvious budding, hyphal, amoeboid, sporal or flagellated growth stages have been observed in laboratory growth conditions. Taxonomy ''Sphaeroforma'' is a member of the Ichthyosporea clade, which is the earliest branching holozoa Holozoa is a group of organisms that includes animals and their closest single-celled relatives, but excludes fungi. ''Holozoa'' is also an old name for the tunicate genus ''Distaplia''.'' Because Holozoa is a clade including all organisms mor ...n lineage. It is a key organism to understand the origin of anima ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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