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Botrylloides Violaceus
''Botrylloides violaceus'' is a colonial ascidian. It is commonly known as the chain tunicate, but has also been called several other common names, including: lined colonial tunicate, orange sheath tunicate, orange tunicate, and violet tunicate. Its native range is in the northwest Pacific from southern China to Japan and Siberia. Colonies grow on solid substrates and consist of individuals arranged in twisting rows. Outside its native range, it is considered an invasive species and is becoming more common in coastal waters of North America and other waters around the world, likely being spread by shipping industries. In the San Francisco Bay area, ''B. violaceus'' can be readily found on boat docks in the Richmond Marina. The ecological impact of ''B. violaceus'' in this region remains unknown. Morphology Zooids are embedded in a transparent tunic and connected by a network of blood vessels that terminate in ampullae (small sac-like structures) at the periphery of the colony. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oka Asajiro
Oka or OKA may refer to: Cars * Oka (automobile), a small car designed by AvtoVAZ and produced by ZMA and SeAZ * OKA 4wd, a large 4-wheel-drive vehicle made in Western Australia by OKA Military * 2B1 Oka, Soviet 420 mm self-propelled mortar * OTR-23 Oka, a theatre ballistic missile deployed by the Soviet Union Places * Oka (Bithynia), a town of ancient Bithynia, now in Turkey * Oka, Quebec, Canada, a village * Oka National Park, near Oka, Quebec * Oka, Akoko, the capital city of Akoko South-West Local Government of Ondo State, Nigeria * Oka (river), in the European part of Russia * Oka (Angara), a river in Siberia, Russia * Oka, West Virginia, United States, an unincorporated community * Oca (river), in northern Spain, spelled "Oka" in the Basque language Codes * Naha Airport, near Naha, Okinawa, IATA airport code OKA * Okay Airways, based in Beijing, China, ICAO airline code OKA * Okanagan language, ISO 639-3 language code oka, spoken in Canada and the United States Oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colony (biology)
In biology, a colony is composed of two or more conspecific individuals living in close association with, or connected to, one another. This association is usually for mutual benefit such as stronger defense or the ability to attack bigger prey. Colonies can form in various shapes and ways depending on the organism involved. For instance, the bacterial colony is a cluster of identical cells (clones). These colonies often form and grow on the surface of (or within) a solid medium, usually derived from a single parent cell. Colonies, in the context of development, may be composed of two or more unitary (or solitary) organisms or be modular organisms. Unitary organisms have determinate development (set life stages) from zygote to adult form and individuals or groups of individuals (colonies) are visually distinct. Modular organisms have indeterminate growth forms (life stages not set) through repeated iteration of genetically identical modules (or individuals), and it can be diffi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascidiacea
Ascidiacea, commonly known as the ascidians, tunicates (in part), and sea squirts (in part), is a polyphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of a polysaccharide. Ascidians are found all over the world, usually in shallow water with salinities over 2.5%. While members of the Thaliacea and Larvacea (Appendicularia) swim freely like plankton, sea squirts are sessile animals after their larval phase: they then remain firmly attached to their substratum, such as rocks and shells. There are 2,300 species of ascidians and three main types: solitary ascidians, social ascidians that form clumped communities by attaching at their bases, and compound ascidians that consist of many small individuals (each individual is called a zooid) forming colonies up to several meters in diameter. Sea squirts feed by taking in water through a tube, the oral siphon. The water enters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince William Sound Regional Citizens’ Advisory Council
The Prince William Sound Regional Citizens' Advisory Council is an independent non-profit organization based in Anchorage and Valdez, Alaska, whose mission is to promote the environmentally-safe operation of the Alyeska Pipeline's Valdez Marine Terminal and associated oil tankers, and to inform the public of those activities. Background and formation In the years leading up to the ''Exxon Valdez'' disaster, safeguards against a spill were gradually decreased and emergency responses not adequately prepared. Nor was there any mechanism, other than public hearings by regulatory agencies, for citizens to advise the oil industry or otherwise speak directly on operations affecting their communities and livelihoods. Earlier attempts by Prince William Sound residents to give input to oil industry representatives were generally met with negative responses. The Council was formed after the Exxon Valdez oil spill of 1989 by citizens of the region to provide a voice for communities affecte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chordate
A chordate () is an animal of the phylum Chordata (). All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them from all the other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. Chordates are also bilaterally symmetric, have a coelom, possess a circulatory system, and exhibit metameric segmentation. In addition to the morphological characteristics used to define chordates, analysis of genome sequences has identified two conserved signature indels (CSIs) in their proteins: cyclophilin-like protein and mitochondrial inner membrane protease ATP23, which are exclusively shared by all vertebrates, tunicates and cephalochordates. These CSI ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regeneration (biology)
In biology, regeneration is the process of renewal, restoration, and tissue growth that makes genomes, cells, organisms, and ecosystems resilient to natural fluctuations or events that cause disturbance or damage. Every species is capable of regeneration, from bacteria to humans. Regeneration can either be complete where the new tissue is the same as the lost tissue, or incomplete where after the necrotic tissue comes fibrosis. At its most elementary level, regeneration is mediated by the molecular processes of gene regulation and involves the cellular processes of cell proliferation, morphogenesis and cell differentiation. Regeneration in biology, however, mainly refers to the morphogenic processes that characterize the phenotypic plasticity of traits allowing multi-cellular organisms to repair and maintain the integrity of their physiological and morphological states. Above the genetic level, regeneration is fundamentally regulated by asexual cellular processes. Regenera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stolidobranchia
Stolidobranchia is an order of tunicates in the class Ascidiacea.Lambert, G.; Gittenberger, A.; Sanamyan, K. (2015)Stolidobranchia.In: Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira Da Rocha, R.; Swalla, B.J.; Turon, X. (2015) Ascidiacea World Database. Accessed through: World Register of Marine Species on 2015-12-23 The group includes both colonial and solitary animals. They are distinguished from other tunicates by the presence of folded pharyngeal baskets. This provides the etymology of their name: in ancient Greek, means the "fold" of a cloth. Stolidobranchian sea squirts are also characterized by the complete absence of an abdomen. The abdominal organs of other tunicates are instead located to one side of the pharyngeal basket in this group. Taxonomy * Molgulidae Lacaze-Duthiers 1877 exacrobylidae Seeliger 1906; Caesiridae**'' Anomopera'' Hartmeyer, 1923 **'' Asajirus'' Kott, 1989 'Hexadactylus'' Monniot & Monniot 1990**'' Bostrichobranchus'' Traustedt, 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
