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Vasa Gene
''Vasa'' is an RNA binding protein with an ATP-dependent RNA helicase that is a member of the DEAD box family of proteins. The vasa gene is essential for germ cell development and was first identified in ''Drosophila melanogaster'', but has since been found to be conserved in a variety of vertebrates and invertebrates including humans. The Vasa protein is found primarily in germ cells in embryos and adults, where it is involved in germ cell determination and function, as well as in multipotent stem cells, where its exact function is unknown. Gene The Vasa gene is a member of the DEAD box family of RNA helicases in ''Drosophila melanogaster.'' Its human ortholog, Ddx4, is located on human chromosome 5q. It is syntenic to mouse chromosome 13, where the mouse vasa gene is located. The gene is conserved in many invertebrates and vertebrate species such as ''Caenorhabditis elegans'', ''Xenopus'', Zebrafish, flatworms, echinoderms, molluscs, nematodes, mice and rats as an important par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicase
Helicases are a class of enzymes that are vital to all organisms. Their main function is to unpack an organism's genetic material. Helicases are motor proteins that move directionally along a nucleic double helix, separating the two hybridized nucleic acid strands (hence '' helic- + -ase''), via the energy gained from ATP hydrolysis. There are many helicases, representing the great variety of processes in which strand separation must be catalyzed. Approximately 1% of eukaryotic genes code for helicases. The human genome codes for 95 non-redundant helicases: 64 RNA helicases and 31 DNA helicases. Many cellular processes, such as DNA replication, transcription, translation, recombination, DNA repair and ribosome biogenesis involve the separation of nucleic acid strands that necessitates the use of helicases. Some specialized helicases are also involved in sensing viral nucleic acids during infection and fulfill an immunological function. Genetic mutations that affect helicase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juri Rappsilber
Juri Rappsilber (born 1971) is a German chemist in the area of mass spectrometry and proteomics. Career Rappsilber studied chemistry at Technische Universität Berlin, University of Strathclyde, and with Tom Rapoport, Harvard Medical School. In 2001, he earned his Ph.D. in Proteomics jointly from EMBL Heidelberg and the Goethe University Frankfurt working in the laboratory of Matthias Mann on the mass spectrometric analysis of protein complexes, externally supervised by Michael Karas. He followed Mann to the University of Southern Denmark and completed a postdoctoral fellowship before starting his independent career at IFOM - FIRC Institute for Molecular Oncology, Milan in 2003. In 2006, he joined the Wellcome Trust Centre for Cell Biology in the Institute of Cell Biology at the University of Edinburgh. In 2009, he became a senior research fellow of the Wellcome Trust, in 2010 he was appointed Professor of Proteomics in Edinburgh. Since 2011, he has been Full Professor and he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertebrate
Vertebrates () are animals with a vertebral column (backbone or spine), and a cranium, or skull. The vertebral column surrounds and protects the spinal cord, while the cranium protects the brain. The vertebrates make up the subphylum Vertebrata with some 65,000 species, by far the largest ranked grouping in the phylum Chordata. The vertebrates include mammals, birds, amphibians, and various classes of fish and reptiles. The fish include the jawless Agnatha, and the jawed Gnathostomata. The jawed fish include both the Chondrichthyes, cartilaginous fish and the Osteichthyes, bony fish. Bony fish include the Sarcopterygii, lobe-finned fish, which gave rise to the tetrapods, the animals with four limbs. Despite their success, vertebrates still only make up less than five percent of all described animal species. The first vertebrates appeared in the Cambrian explosion some 518 million years ago. Jawed vertebrates evolved in the Ordovician, followed by bony fishes in the Devonian. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligochaete
Oligochaeta () is a subclass of soft-bodied animals in the phylum Annelida, which is made up of many types of aquatic and terrestrial worms, including all of the various earthworms. Specifically, oligochaetes comprise the terrestrial megadrile earthworms (some of which are semiaquatic or fully aquatic), and freshwater or semiterrestrial microdrile forms, including the tubificids, pot worms and ice worms ( Enchytraeidae), blackworms ( Lumbriculidae) and several interstitial marine worms. With around 10,000 known species, the Oligochaeta make up about half of the phylum Annelida. These worms usually have few setae (chaetae) or "bristles" on their outer body surfaces, and lack parapodia, unlike polychaeta. Diversity Oligochaetes are well-segmented worms and most have a spacious body cavity (coelom) used as a hydroskeleton. They range in length from less than up to in the 'giant' species such as the giant Gippsland earthworm (''Megascolides australis'') and the Mekong wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platynereis Dumerilii
''Platynereis dumerilii'' is a species of annelid polychaete worm. It was originally placed into the genus '' Nereis'' and later reassigned to the genus '' Platynereis''. ''Platynereis dumerilii'' lives in coastal marine waters from temperate to tropical zones. It can be found in a wide range from the Azores, the Mediterranean, in the North Sea, the English Channel, and the Atlantic down to the Cape of Good Hope, in the Black Sea, the Red Sea, the Persian Gulf, the Sea of Japan, the Pacific, and the Kerguelen Islands. ''Platynereis dumerilii'' is today an important lab animal, it is considered a living fossil, and it is used in many phylogenetic studies as a model organism. Description ''Platynereis dumerilii'' is a small marine ragworm: Males reach a length of 2 to 3 cm, while females reach a length of 3 to 4 cm. Like a number of invertebrate phyla, ''Platynereis dumerilii'' has an axochord, a paired longitudinal muscle that displays striking similarities to the n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilyanassa
''Ilyanassa'' is a genus of sea snails, marine gastropod mollusks in the family Nassariidae The Nassariidae, Nassa mud snails (US), or dog whelks (UK) are a taxonomic family of small to medium-sized snails, mostly marine gastropod mollusks in the clade Neogastropoda. These snails have rounded shells with a high spire, an oval ap ..., the Nassa mud snails or dog whelks.Marshall, B.; Bouchet, P.; Gofas, S.; Rosenberg, G. (2016). Ilyanassa Stimpson, 1865. In: MolluscaBase (2016). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=467489 on 2016-05-18 Species Species within the genus ''Ilyanassa'' include: * '' Ilyanassa obsoleta'' (Say, 1822): * '' Ilyanassa trivittata'' (Say, 1822): synonym of '' Tritia trivittata'' (Say, 1822) References External links Stimpson W. 1865. On certain genera and families of zoophagous gasteropods. American Journal of Conchology, 1: 55-64, pl. 8-9L.A., Puillandre N., Utge J., Lozo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyascus Polygenea
''Polyascus'' is a genus of barnacles in infraclass Rhizocephala. It was circumscribed in 2003 by Henrik Glenner, Jørgen Lützen, and Tohru Takahashi. They included three species, all transferred from ''Sacculina''. The generic name ''polyascus'' (''poly'' "many" + ''ascus'' "bag") refers to the typical presence of multiple external sac-like female bodies, known as ''externae''. In ''Polyascus'' species, these originate from asexual reproduction. Species , WoRMS The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ... recognizes the following three species, all included in the genus's circumscription. References Barnacles Parasites of crustaceans Parasitic crustaceans Crustacean genera {{maxillopoda-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnidarians
Cnidaria ( ) is a phylum under kingdom Animalia containing over 11,000 species of aquatic invertebrates found both in fresh water, freshwater and marine environments (predominantly the latter), including jellyfish, hydroid (zoology), hydroids, sea anemones, corals and some of the smallest marine parasites. Their distinguishing features are an uncentralized nervous system distributed throughout a gelatinous body and the presence of cnidocytes or cnidoblasts, specialized cells with ejectable flagella used mainly for envenomation and capturing prey. Their bodies consist of mesoglea, a non-living, jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell (biology), cell thick. Cnidarians are also some of the few animals that can reproduce both sexually and asexually. Cnidarians mostly have two basic body forms: swimming medusa (biology), medusae and sessility (motility), sessile polyp (zoology), polyps, both of which are radially symmetrical with mou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teleost
Teleostei (; Ancient Greek, Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which are known as teleosts (), is, by far, the largest group of ray-finned fishes (class Actinopterygii), with 96% of all neontology, extant species of fish. The Teleostei, which is variously considered a Division (zoology), division or an infraclass in different taxonomic systems, include over 26,000 species that are arranged in about 40 order (biology), orders and 448 family (biology), families. Teleosts range from giant oarfish measuring or more, and ocean sunfish weighing over , to the minute male anglerfish ''Photocorynus spiniceps'', just long. Including not only torpedo-shaped fish built for speed, teleosts can be flattened vertically or horizontally, be elongated cylinders or take specialised shapes as in anglerfish and seahorses. The difference between teleosts and other bony fish lies mainly in their jaw bones; teleosts have a movable premaxilla and corresponding modifications ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oyster
Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species, the valves are highly calcified, and many are somewhat irregular in shape. Many, but not all oysters, are in the superfamily Ostreoidea. Some species of oyster are commonly consumed and are regarded as a delicacy in some localities. Some types of pearl oysters are harvested for the pearl produced within the mantle. Others, such as the translucent Windowpane oysters, are harvested for their shells. Etymology The word ''oyster'' comes from Old French , and first appeared in English during the 14th century. The French derived from the Latin , the feminine form of , which is the Latinisation (literature), latinisation of the Ancient Greek () 'oyster'. Compare () 'bone'. Types True oysters True oysters are members of the family Ostreidae. This family includes the edible oysters, which mainly belong to the genera '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Botryllus Primigenus
''Botryllus'' is a genus of colonial ascidian tunicates in the family Styelidae Styelidae is a family of ascidian tunicates. Genera *'' Alloeocarpa'' Michaelsen, 1900 *'' Arnbackia'' Brewin, 1950 *''Asterocarpa'' Brewin, 1946 *'' Bathyoncus'' Herdman, 1882 *'' Bathystyeloides'' Seeliger, 1907 *'' Berillia'' Brewin, 1952 * .... Species Species in this genus include: * '' Botryllus arenaceus'' Monniot, 1988 * '' Botryllus aster'' Monniot, 1991 * '' Botryllus closionis'' Monniot, Monniot, Griffiths & Schleyer, 2001 * '' Botryllus compositus'' Tokioka, 1967 * '' Botryllus delicatus'' Okuyama & Saito, 2001 * '' Botryllus eilatensis'' Shenkar & Monniot, 2006 * '' Botryllus elegans'' (Quoy & Gaimard, 1834) * '' Botryllus firmus'' Monniot & Monniot, 1996 * '' Botryllus gregalis'' (Sluiter, 1898) * '' Botryllus horridus'' Saito & Okuyama, 2003 * '' Botryllus japonicus'' (Oka, 1931) * '' Botryllus leptus'' Savigny, 1816 * '' Botryllus maeandrius'' (Sluiter, 1898) * '' Botryllus mag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RNA Interference
RNA interference (RNAi) is a biological process in which RNA molecules are involved in sequence-specific suppression of gene expression by double-stranded RNA, through translational or transcriptional repression. Historically, RNAi was known by other names, including ''co-suppression'', ''post-transcriptional gene silencing'' (PTGS), and ''quelling''. The detailed study of each of these seemingly different processes elucidated that the identity of these phenomena were all actually RNAi. Andrew Fire and Craig Mello shared the 2006 Nobel Prize in Physiology or Medicine for their work on RNAi in the nematode worm ''Caenorhabditis elegans'', which they published in 1998. Since the discovery of RNAi and its regulatory potentials, it has become evident that RNAi has immense potential in suppression of desired genes. RNAi is now known as precise, efficient, stable and better than antisense therapy for gene suppression. Antisense RNA produced intracellularly by an expression vector may be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
