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Macrostomum Rostratum
''Macrostomum rostratum'' is a free-living, hermaphroditic flatworm in the family Macrostomidae, found in freshwater and brackish environments. Description ''Macrostomum rostratum'' is colourless and between in length. There are a pair of small eyes at the anterior end and a longitudinal-slit mouth on the ventral surface just behind these. A short pharynx leads from the mouth to a simple gut. Also on the ventral surface, the female gonopore, which is shaped like a rosette, is in front of the male gonopore and penis which are half way along the flatworm. The posterior end of the worm bears an adhesive plate and can spread out to stick to a surface, and the edge of this region bears rodlike rhabdites (defensive structures) in the tissues. Distribution and habitat ''Macrostomum rostratum'' occurs sporadically in the European coastline in the northeastern Atlantic Ocean, typically in the splash zone in both fresh and salt water. It is present in rock pools at Oxwich Bay and Port ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermaphrodite
In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many taxonomic groups of animals (mostly invertebrates) do not have separate sexes. In these groups, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. For example, the great majority of tunicates, pulmonate molluscs, opisthobranch, earthworms, and slugs are hermaphrodites. Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. Most plants are also hermaphrodites. Animal species having different sexes, male and female, are called gonochoric, which is the opposite of hermaphrodite. There are also species where hermaphrodites exist alongside males (called androdioecy) or alongside females (called gynodioecy), or all three exist in the same species (called trioecy); these three ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Port Erin
Port Erin ( gv, Purt Çhiarn, meaning ''lord's port'') is a seaside village in the south-west of the Isle of Man, in the historic parish of Rushen. It was previously a seaside resort before the decline of the tourist trade. Administratively it is designated as a village district, with its own board of commissioners. The district covers around 1 square mile, and is adjacent to: Port St Mary to the south-east; the main part of Arbory and Rushen parish district to the north and east; the sea to the west; and an exclave of Arbory and Rushen parish district (including the village of Cregneash) to the south. Following recent residential expansion, the settlement is now contiguous with that of Port St Mary, and on 18 July 2018 Tynwald authorised a public enquiry into the proposed expansion of the district boundary to include some of this expansion. The village was twinned with Latour-de-France. Demographics * Population (2011 census) 3,530 * Adjacent village: Port St Mary * Larges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypodermic
A hypodermic needle (from Greek ὑπο- (''hypo-'' = under), and δέρμα (''derma'' = skin)), one of a category of medical tools which enter the skin, called sharps, is a very thin, hollow tube with one sharp tip. It is commonly used with a syringe, a hand-operated device with a plunger, to inject substances into the body (e.g., saline solution, solutions containing various drugs or liquid medicines) or extract fluids from the body (e.g., blood). Large-bore hypodermic intervention is especially useful in catastrophic blood loss or treating shock. A hypodermic needle is used for rapid delivery of liquids, or when the injected substance cannot be ingested, either because it would not be absorbed (as with insulin), or because it would harm the liver. It is also useful to deliver certain medications that cannot be delivered orally due to vomiting. There are many possible routes for an injection, with intramuscular (into a muscle) and intravenous (into a vein) being the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stylet (anatomy)
A stylet is a hard, sharp, anatomical structure found in some invertebrates. For example, the word ''stylet'' or stomatostyle is used for the primitive piercing mouthparts of some nematodes and some nemerteans. In these groups the stylet is a hardened protrusible opening to the stomach. These stylets are adapted for the piercing of cell walls and usually function by providing the operative organism with access to the nutrients contained within the prey cell. The mouthparts of tardigrades, diptera and aphids are also called stylets. In octopodes An octopus ( : octopuses or octopodes, see below for variants) is a soft-bodied, eight- limbed mollusc of the order Octopoda (, ). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, ..., the stylets are internal, needle-like bent rods within the mantle, the vestigial remnants of an external shell. References Nematode anatomy {{Animal-anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematode
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant- parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with arthropods, tardigrades and other moulting animals in the clade Ecdysozoa, and unlike flatworms, have tubular digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over time. A 2013 survey of animal biodiversity published in the mega ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Station
A power station, also referred to as a power plant and sometimes generating station or generating plant, is an industrial facility for the generation of electric power. Power stations are generally connected to an electrical grid. Many power stations contain one or more generators, a rotating machine that converts mechanical power into three-phase electric power. The relative motion between a magnetic field and a conductor creates an electric current. The energy source harnessed to turn the generator varies widely. Most power stations in the world burn fossil fuels such as coal, oil, and natural gas to generate electricity. Low-carbon power sources include nuclear power, and an increasing use of renewables such as solar, wind, geothermal, and hydroelectric. History In early 1871 Belgian inventor Zénobe Gramme invented a generator powerful enough to produce power on a commercial scale for industry. In 1878, a hydroelectric power station was designed and built ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Konin Lakes
The Konin Lakes are a group of lakes forming a long navigable channel in central Poland. The lakes include Pątnowskie Lake, Mikorzyńskie Lake, Gosławskie Lake, Licheńskie Lake and Ślesińskie Lake, connecting the River Warta and Lake Gopło and linked to the Warta-Goplo Canal. The lakes are of particular interest because they receive the water outlets from two power stations and the temperature of the water is significantly raised, supporting a different flora and fauna to other lakes in the region. Water for the two power stations is drawn primarily from Lake Pątnowskie, and discharged via canals to Lake Licheńskie, with other outlets flowing into the other lakes. The cooling scheme varies with the time of year, with Licheńskie, Ślesińskie and Mikorzyńskie being included in June but excluded in October. The total area of the lakes is between , and the greatest depth is . Lake Licheńskie is shallow and shows the greatest temperature variation, reaching a maxim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulva Lactuca
''Ulva lactuca'', also known by the common name sea lettuce, is an edible green alga in the family Ulvaceae. It is the type species of the genus '' Ulva''. A synonym is ''U. fenestrata'', referring to its "windowed" or "holed" appearance. Description ''Ulva lactuca'' is a thin flat green alga growing from a discoid holdfast. The margin is somewhat ruffled and often torn. It may reach or more in length, though generally much less, and up to across. The membrane is two cells thick, soft and translucent, and grows attached, without a stipe, to rocks or other algae by a small disc-shaped holdfast. Green to dark green in colour, this species in the Chlorophyta is formed of two layers of cells irregularly arranged, as seen in cross-section. The chloroplast is cup-shaped in some references but as a parietal plate in others with one to three pyrenoids. There are other species of ''Ulva'' which are similar and not always easy to differentiate. Distribution The distribution is wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxwich Bay
Oxwich Bay on the Gower Peninsula of South Wales Oxwich Bay ( cy, Bae Oxwich) is a bay on the south of the Gower Peninsula, Wales. Its landscape features sand dunes, salt marshes and woodland. Oxwich Bay includes a long sandy beach, accessible from the village of Oxwich. It is a popular spot for swimming and watersports including diving, sailing, water skiing and windsurfing. There is a public footpath along the cliffs from Oxwich Bay, around Oxwich Point, and to Port Eynon Bay. Buses run every couple of hours between Oxwich and Port Eynon. A wetland site at the rear of the dunes forms Oxwich Burrows National Nature Reserve. The dunes are crossed by a small stream called Nicholaston Pill. The bay ends at the eastern end with the cliffs of High Tor; but at low tide, a continuous sandy beach connects with Three Cliffs Bay beyond. Within the nature reserve there are rare plants such as the dune gentian and the round-leafed wintergreen, insects such as the small blue, beachco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flatworm
The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, ''platy'', meaning "flat" and ἕλμινς (root: ἑλμινθ-), ''helminth-'', meaning "worm") are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates. Unlike other bilaterians, they are acoelomates (having no body cavity), and have no specialized circulatory and respiratory organs, which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion (intake of nutrients) and egestion (removal of undigested wastes); as a result, the food cannot be processed continuously. In traditional medicinal texts, Platyhelminthes are divided into Turbellaria, which are mostly non- parasitic animals such as planarians, and three entirely parasitic groups: Cestoda, Trematoda and Monogenea; however, since the turbellarians have since been proven no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tide Pool
A tide pool or rock pool is a shallow pool of seawater that forms on the rocky intertidal shore. Many of these pools exist as separate bodies of water only at low tide. Many tide pool habitats are home to especially adaptable animals that have engaged the attention of naturalists and marine biologists, as well as philosophical essayists: John Steinbeck wrote in '' The Log from the Sea of Cortez'', "It is advisable to look from the tide pool to the stars and then back to the tide pool." Zones from shallow to deep The rocky shoreline exhibits zonation as a feature of the shoreline. Tidal movements of water creates zonation patterns along rocky shores from high to low-tide. The area above the high-tide mark is the supralittoral zone which is virtually a terrestrial environment. The area around the high-tide mark is known as the intertidal fringe. Between the high and low-tide marks is the intertidal or littoral zone. Below the low-tide mark is the sublittoral or subt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Splash Zone
In offshore construction, the splash zone is the transition from air to water when lowering heavy burdens into the sea. The overall efforts applied on the crane change dramatically when the load starts touching water, up to the point where it is completely submerged. Its buoyancy Buoyancy (), or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the p ... reduces the static mass that the crane has to support, but contact with the waves creates widely fluctuating dynamic forces. Simulation of these changing efforts are necessary to correctly dimension cranes and lifting equipment. See for examplDNV-RP-H103(Det Norske Veritas recommended practices) for a mention of the piston effect created in the splash zone between two walls. Offshore engineering {{Engineering-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
