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Dokdonia Lutea
''Dokdonia'' is a genus of bacteria in the family ''Flavobacteriaceae'' and phylum Bacteroidota. The genus ''Dokdonia'' was first described in 2005 by Yoon et al. near Liancourt Rocks in the Sea of Japan. ''Dokdonia'' is named after Dokdo, the Korean name for the Liancourt Rocks which lies between Japan and South Korea. Yoon et al. isolated the bacterium from seawater and identified the first species as '' Dokdonia donghaensis.'' There are 10 classified species (''D. aurantiaca, D. diaphoros, D. donghaensis, D. eikasta, D. flava, D. genika, D. lutea, D. pacifica, D. ponticola'', and ''D. sinensis'') and many unclassified strains under the ''Dokdonia'' genus based on the NCBI taxonomy database. The International Committee on Systematics of Prokaryotes (ICSP) currently recognizes nine groups of ''Dokdonia'' described to species level with ''D. ponticola'' considered not validly published. The general characteristics of ''Dokdonia'' species include gram-negative, non-motile, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacteria
Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationsh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liancourt Rocks
The Liancourt Rocks, also known by their Korean name of Dokdo or their Japanese name of Takeshima,; ; . form a group of islets in the Sea of Japan between the Korean peninsula and the Japanese archipelago. The Liancourt Rocks comprise two main islets and 35 smaller rocks; the total surface area of the islets is and the highest elevation of is on the West Islet. The Liancourt Rocks lie in rich fishing grounds that may contain large deposits of natural gas. The English name ''Liancourt Rocks'' is derived from , the name of a French whaling ship that came close to being wrecked on the rocks in 1849. While South Korea controls the islets, its sovereignty over them is Liancourt Rocks dispute, contested by Japan. North Korea also claims the territory. South Korea classifies the islets as Dokdo-Ri (administrative division), ri, Ulleung-Eup (administrative division), eup, Ulleung County, North Gyeongsang Province, while Japan classifies the islands as part of Okinoshima, Shima ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East China Sea
The East China Sea is an arm of the Western Pacific Ocean, located directly offshore from East China. It covers an area of roughly . The sea’s northern extension between mainland China and the Korean Peninsula is the Yellow Sea, separated by an imaginary line between the eastern tip of Qidong at the Yangtze River estuary and the southwestern tip of South Korea's Jeju Island. The East China Sea is bounded in the east and southeast by the middle portion of the first island chain off the eastern Eurasian continental mainland, including the Japanese island of Kyushu and the Ryukyu Islands, and in the south by the island of Taiwan. It connects with the Sea of Japan in the northeast through the Korea Strait, the South China Sea in the southwest via the Taiwan Strait, and the Philippine Sea in the southeast via gaps between the various Ryukyu Islands (e.g. Tokara Strait and Miyako Strait). Most of the East China Sea is shallow, with almost three-fourths of it being less than ... [...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 Europea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colony Morphology Of Dokdonia Donghaensis Strain MED134
In modern parlance, a colony is a territory subject to a form of foreign rule. Though dominated by the foreign colonizers, colonies remain separate from the administration of the original country of the colonizers, the '' metropolitan state'' (or "mother country"). This administrative colonial separation makes colonies neither incorporated territories nor client states. Some colonies have been organized either as dependent territories that are not sufficiently self-governed, or as self-governed colonies controlled by colonial settlers. The term colony originates from the ancient Roman '' colonia'', a type of Roman settlement. Derived from ''colon-us'' (farmer, cultivator, planter, or settler), it carries with it the sense of 'farm' and 'landed estate'. Furthermore the term was used to refer to the older Greek ''apoikia'' (), which were overseas settlements by ancient Greek city-states. The city that founded such a settlement became known as its '' metropolis'' ("mother-c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flexirubin
Flexirubin is the main pigment in the bacteria genera ''Flexibacter'', ''Flavobacterium'', ''Chryseobacterium'', and ''Cytophaga''.Reichenbach, H., W. Kohl, et al. (1980). ''FLEXIRUBIN-TYPE PIGMENTS IN FLAVOBACTERIUM''. Archives of Microbiology 126(3): 291–293. It was isolated for the first time from '' Flexibacter elegans''. Flexirubin is found in these genera, as well as those that produce carotenoids. The pigment mixture of flexirubin and carotenoids imparts colonies with an intense yellow-orange color.Hans Achenbach, W. Kohl, et al. (1976). ''INVESTIGATIONS ON METABOLITES OF MICROORGANISMS .11. FLEXIRUBIN, A NOVEL PIGMENT FROM FLEXIBACTER-ELEGANS''. Chemische Berichte-Recueil 109(7): 2490–2502. Structurally, this bacteria pigment is based on a polycarboxylic-chromophore that is linked with a phenol by an ester, resulting in an alkyl side-chain. The first total synthesis of flexirubin was reported in 1977.Achenbach, H. and J. Witzke (1977). ''TOTAL SYNTHESIS OF FLEXIRUBIN DIM ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carotenoid
Carotenoids (), also called tetraterpenoids, are yellow, orange, and red organic compound, organic pigments that are produced by plants and algae, as well as several bacteria, and Fungus, fungi. Carotenoids give the characteristic color to pumpkins, carrots, parsnips, maize, corn, tomatoes, Domestic Canary, canaries, flamingos, salmon, lobster, shrimp, and daffodils. Carotenoids can be produced from Lipid, fats and other basic organic metabolic building blocks by all these organisms. It is also produced by Endosymbiont, endosymbiotic bacteria in Whitefly, whiteflies. Carotenoids from the diet are stored in the fatty tissues of animals, and exclusively Carnivore, carnivorous animals obtain the compounds from animal fat. In the human diet, Small intestine#Absorption, absorption of carotenoids is improved when consumed with fat in a meal. Cooking carotenoid-containing vegetables in oil and shredding the vegetable both increase carotenoid bioavailability. There are over 1,100 known c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biofilm
A biofilm comprises any syntrophic consortium of microorganisms in which cells stick to each other and often also to a surface. These adherent cells become embedded within a slimy extracellular matrix that is composed of extracellular polymeric substances (EPSs). The cells within the biofilm produce the EPS components, which are typically a polymeric conglomeration of extracellular polysaccharides, proteins, lipids and DNA. Because they have three-dimensional structure and represent a community lifestyle for microorganisms, they have been metaphorically described as "cities for microbes". Biofilms may form on living or non-living surfaces and can be prevalent in natural, industrial, and hospital settings. They may constitute a microbiome or be a portion of it. The microbial cells growing in a biofilm are physiologically distinct from planktonic cells of the same organism, which, by contrast, are single cells that may float or swim in a liquid medium. Biofilms can form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mixotroph
A mixotroph is an organism that can use a mix of different sources of energy and carbon, instead of having a single trophic mode on the continuum from complete autotrophy at one end to heterotrophy at the other. It is estimated that mixotrophs comprise more than half of all microscopic plankton. There are two types of eukaryotic mixotrophs: those with their own chloroplasts, and those with endosymbionts—and those that acquire them through kleptoplasty or by enslaving the entire phototrophic cell. Possible combinations are photo- and chemotrophy, litho- and organotrophy (osmotrophy, phagotrophy and myzocytosis), auto- and heterotrophy or other combinations of these. Mixotrophs can be either eukaryotic or prokaryotic. They can take advantage of different environmental conditions. If a trophic mode is obligate, then it is always necessary for sustaining growth and maintenance; if facultative, it can be used as a supplemental source. Some organisms have incomplete Calvin cycles, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phototroph
Phototrophs () are organisms that carry out photon capture to produce complex organic compounds (e.g. carbohydrates) and acquire energy. They use the energy from light to carry out various cellular metabolic processes. It is a common misconception that phototrophs are obligatorily photosynthetic. Many, but not all, phototrophs often photosynthesize: they anabolically convert carbon dioxide into organic material to be utilized structurally, functionally, or as a source for later catabolic processes (e.g. in the form of starches, sugars and fats). All phototrophs either use electron transport chains or direct proton pumping to establish an electrochemical gradient which is utilized by ATP synthase, to provide the molecular energy currency for the cell. Phototrophs can be either autotrophs or heterotrophs. If their electron and hydrogen donors are inorganic compounds (e.g. , as in some purple sulfur bacteria, or , as in some green sulfur bacteria) they can be also called lithot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dissolved Organic Carbon
Dissolved organic carbon (DOC) is the fraction of organic carbon operationally defined as that which can pass through a filter with a pore size typically between 0.22 and 0.7 micrometers. The fraction remaining on the filter is called particulate organic carbon (POC). Dissolved organic matter (DOM) is a closely related term often used interchangeably with DOC. While DOC refers specifically to the mass of carbon in the dissolved organic material, DOM refers to the total mass of the dissolved organic matter. So DOM also includes the mass of other elements present in the organic material, such as nitrogen, oxygen and hydrogen. DOC is a component of DOM and there is typically about twice as much DOM as DOC. Many statements that can be made about DOC apply equally to DOM, and ''vice versa''. DOC is abundant in marine and freshwater systems and is one of the greatest cycled reservoirs of organic matter on Earth, accounting for the same amount of carbon as in the atmosphere and up ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxidase
In biochemistry, an oxidase is an enzyme that catalyzes oxidation-reduction reactions, especially one involving dioxygen (O2) as the electron acceptor. In reactions involving donation of a hydrogen atom, oxygen is reduced to water (H2O) or hydrogen peroxide (H2O2). Some oxidation reactions, such as those involving monoamine oxidase or xanthine oxidase, typically do not involve free molecular oxygen. The oxidases are a subclass of the oxidoreductases. Examples An important example is cytochrome c oxidase, the key enzyme that allows the body to employ oxygen in the generation of energy and the final component of the electron transfer chain. Other examples are: * Glucose oxidase * Monoamine oxidase * Cytochrome P450 oxidase * NADPH oxidase * Xanthine oxidase * L-gulonolactone oxidase * Laccase * Lysyl oxidase * Polyphenol oxidase * Sulfhydryl oxidase. This enzyme oxidises thiol groups. Oxidase test In microbiology, the oxidase test is used as a phenotypic characteristic for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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