|
Labyrinthula Zosterae
The genus ''Labyrinthula'' is part of the protist group Labyrinthulomycetes and contains thirteen species. The major feature of this genus is the formation of an ectoplasmic net secreted by specialized organelles called bothrosomes which surrounds the colony, which is also used by ''Labyrinthula'' for moving. The protist reproduces by zoosporulation as it sets some flagellated spores free from a sporangium. Zoospores prove the belonging of ''Labyrinthula'' in the Heterokont phylum due to the distinct flagellar morphology, in which the anterior one is covered in mastigonemes. The interest in ''Labyrinthula'' arose as it has been identified as the cause of the "wasting disease", which led to the death of more than 90% of the seagrass population of the North Atlantic coast in the early 1930s. Etymology A labyrinth is a synonym of a maze, reflecting the ectoplasmic net, which gives the protist a net-like shape which resembles a maze. The word comes from Ancient Greek λαβύρι ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryota
Eukaryotes () are organisms whose cells have a nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the three domains of life. Bacteria and Archaea (both prokaryotes) make up the other two domains. The eukaryotes are usually now regarded as having emerged in the Archaea or as a sister of the Asgard archaea. This implies that there are only two domains of life, Bacteria and Archaea, with eukaryotes incorporated among archaea. Eukaryotes represent a small minority of the number of organisms, but, due to their generally much larger size, their collective global biomass is estimated to be about equal to that of prokaryotes. Eukaryotes emerged approximately 2.3–1.8 billion years ago, during the Proterozoic eon, likely as Flagellated cell, flagellated phagotrophs. Their name comes from the Greek language, Greek wikt:εὖ, εὖ (''eu'', "well" or "good") and wikt: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zoospore
A zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves. Diversity Flagella types Zoospores may possess one or more distinct types of flagella - tinsel or "decorated", and whiplash, in various combinations. *Tinsellated (straminipilous) flagella have lateral filaments known as mastigonemes perpendicular to their main axis, which allow for more surface area, and disturbance of the medium, giving them the property of a rudder, that is, used for steering. *Whiplash flagella are straight, to power the zoospore through its medium. Also, the "default" zoospore only has the propelling, whiplash flagella. Both tinsel and whiplash flagella beat in a sinusoidal wave pattern, but when both are present, the tinsel beats in the opposite direction of the whiplash, to give two axes of control of motility. Morphological types In eukaryotes, the four main type ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thecamoeba
''Thecamoeba ''is a genus of Amoebozoa Amoebozoa is a major taxonomic group containing about 2,400 described species of amoeboid protists, often possessing blunt, fingerlike, lobose pseudopods and tubular mitochondrial cristae. In traditional and currently no longer supported c ... with a tough pellicle simulating a shell. It includes the species: * ''T. aesculea'' Kudryavtsev & Hausmann 2009 * ''T. assimilis'' Lepşi 1960 * ?''T. bilizi'' (Schaeffer 1926) * ?''T. circita'' Dumas 1929 * ?''T. corrugata'' Bovee 1953 * ''T. cosmophorea'' Mesentsev & Smirnov 2019 * ?''T. exapartirta'' Escomel 1929 * ''T. hilla'' Schaeffer 1926 * ''T. hoffmani'' Sawyer, Hnath & Conrad 1974 * ''T. munda'' Schaeffer 1926 * ''T. orbis'' Schaeffer 1926 * ?''T. ovalis'' Lepşi 1960 * ?''T. papyracea'' (Penard 1905) * ''T. pulchra'' (Biernacka 1963) Page 1977 * ''T. quadrilineata'' (Carter 1856) Lepşi 1960 * ?''T. quinquepartita'' Dumas 1929 * ?''T. rugosa'' Schaeffer 1926 * ''T. similis'' (Gree ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaetomorpha
''Chaetomorpha'' is a genus of green algae in the family Cladophoraceae.Guiry, M. D. (2004)''Chaetomorpha''.''In:'' Guiry, M. D. & Guiry, G. M. (2017). AlgaeBase. Accessed through: World Register of Marine Species on 9 August 2017. Members of this genus may be referred to by the common name sea emerald. Description Algae of this genus are made up of macroscopic filaments of cylindrical cells. The genus is characterized by its unbranched filaments, making it distinctive; its closest relatives are branching species of the genus ''Cladophora''.Leliaert, Frederik, et al. (2011)Atypical development of ''Chaetomorpha antennina'' in culture (Cladophorales, Chlorophyta).''Phycological Research'' 59.2 91-97. Species There are about 50 species. Species include: * ''Chaetomorpha adriani'' * '' Chaetomorpha aerea'' * ''Chaetomorpha akineta'' * ''Chaetomorpha antennina'' * ''Chaetomorpha bangioides'' * ''Chaetomorpha basiretrorsa'' * ''Chaetomorpha billardierii'' * ''Chaetomorpha brac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Symbiont
Symbiosis (from Greek , , "living together", from , , "together", and , bíōsis, "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasitic. The organisms, each termed a symbiont, must be of different species. In 1879, Heinrich Anton de Bary defined it as "the living together of unlike organisms". The term was subject to a century-long debate about whether it should specifically denote mutualism, as in lichens. Biologists have now abandoned that restriction. Symbiosis can be obligatory, which means that one or more of the symbionts depend on each other for survival, or facultative (optional), when they can generally live independently. Symbiosis is also classified by physical attachment. When symbionts form a single body it is called conjunctive symbiosis, while all other arrangements are called disjunctive symbiosis."symbiosis." Dorland's Illustrated Medical Dictionary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bothros
Bothros (Greek βόθρος, plural ''bothroi'') is the Ancient Greek word for "hole", "pit" or "trench". In contemporary use it can refer to a variety of holes or depressions found at ancient sites and referred to in literature, and has also been utilized in biological taxonomy to describe species or structures that have similar characteristics. Historic / Archaeological uses In Greek antiquity, a ''bothros'' was an artificially-created or formed depression in the ground, which could serve various purposes. In archaeology, similar items are also referred to by this name and interpreted depending on their context as altars, locations for sacrifice or storage pits. In the works of Homer, ''bothros'' generally refers to a depression or pit in the ground. In the Odyssey, the handmaidens of Nausicaa wash their clothes in one, and at the advice of Circe Odysseus digs one for the offering of libations to the dead in the underworld - first honey and milk, then wine, then water. They wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zostera Marina
''Zostera marina'' is a flowering vascular plant species as one of many kinds of seagrass, with this species known primarily by the English name of eelgrass with seawrack much less used, and refers to the plant after breaking loose from the submerged wetland soil, and drifting free with ocean current and waves to a coast seashore. It is a saline soft-sediment submerged plant native to marine environments on the coastlines of northern latitudes from subtropical to subpolar regions of North America and Eurasia. Distribution This species is the most wide-ranging marine flowering plant in the Northern Hemisphere. It lives in cooler ocean waters in the North Atlantic and North Pacific, and in the warmer southern parts of its range it dies off during warmer seasons. It grows in the Arctic region and endures several months of ice cover per year.Borum J., et al., (Eds.) (2004.European seagrasses: an introduction to monitoring and management.European Union: Monitoring & Managing of Euro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ectoplasmic Net , physically sensible phenomenon claimed to be due to "energy" described as paranormal
{{disambiguation ...
Ectoplasm may refer to: Biology * Ectoplasm (cell biology), the outer part of the cytoplasm * Ectoplasm, outer layer of soft tissue in foraminiferans Art and entertainment * ''Ectoplasm'' (radio show), BBC Radio 4 comedy series * Ectoplasm (''My Hero Academia''), a character in the manga series ''My Hero Academia'' Other uses * Ectoplasm (paranormal) Ectoplasm (from Greek ''ektos'' 'outside' and ''plasma'' 'something formed or molded') is a term used in spiritualism to denote a substance or spiritual energy "exteriorized" by physical mediums. It was coined in 1894 by psychical researcher Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAR Supergroup
The SAR supergroup, also just SAR or Harosa, is a clade that includes stramenopiles (heterokonts), alveolates, and Rhizaria. The name is an acronym derived from the first letters of each of these clades; it has been alternatively spelled "RAS". The term "Harosa" (at the subkingdom level) has also been used. The SAR supergroup is a node-based taxon. Note that as a formal taxon, "Sar" has only its first letter capitalized, while the earlier abbreviation, SAR, retains all uppercase letters. Both names refer to the same group of organisms, unless further taxonomic revisions deem otherwise. Members of the SAR supergroup were once included under the separate supergroups Chromalveolata ( Chromista and Alveolata) and Rhizaria, until phylogenetic studies confirmed that stramenopiles and alveolates diverged with Rhizaria. This apparently excluded haptophytes and cryptomonads, leading Okamoto ''et al.'' (2009) to propose the clade Hacrobia to accommodate them. Phylogeny Based on a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Labyrinthulomycetes
The Labyrinthulomycetes ( ICBN) or Labyrinthulea (ICZN) are a class of protists that produce a network of filaments or tubes, which serve as tracks for the cells to glide along and absorb nutrients for them. The two main groups are the labyrinthulids (or slime nets) and thraustochytrids. They are mostly marine, commonly found as parasites on algae and seagrasses or as decomposers on dead plant material. They also include some parasites of marine invertebrates. Characteristics Although they are outside the cells, the filaments of Labyrinthulomycetes are surrounded by a membrane. They are formed and connected with the cytoplasm by a unique organelle called a sagenogen or bothrosome. The cells are uninucleated and typically ovoid, and move back and forth along the amorphous network at speeds varying from 5-150 μm per minute. Among the labyrinthulids, the cells are enclosed within the tubes, and among the thraustochytrids, they are attached to their sides. Classifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protist
A protist () is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus. While it is likely that protists share a common ancestor (the last eukaryotic common ancestor), the exclusion of other eukaryotes means that protists do not form a natural group, or clade. Therefore, some protists may be more closely related to animals, plants, or fungi than they are to other protists. However, like the groups ''algae'', ''invertebrates'', and '' protozoans'', the biological category ''protist'' is used for convenience. Others classify any unicellular eukaryotic microorganism as a protist. The study of protists is termed protistology. History The classification of a third kingdom separate from animals and plants was first proposed by John Hogg in 1860 as the kingdom Protoctista; in 1866 Ernst Haeckel also proposed a third kingdom Protista as "the kingdom of primitive forms". Originally these also included prokaryote ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.JPG "Click for more on -> Bothros")
