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Electric Catfish
Electric catfish or Malapteruridae is a family of catfishes (order Siluriformes). This family includes two genera, '' Malapterurus'' and ''Paradoxoglanis'', with 21 species. Several species of this family have the ability to generate electricity, delivering a shock of up to 350 volts from its electric organ. Electric catfish are found in tropical Africa and the Nile River. Electric catfish are usually nocturnal and carnivorous. Some species feed primarily on other fish, incapacitating their prey with electric discharges, but others are generalist bottom foragers, feeding on things like invertebrates, fish eggs, and detritus. The largest can grow to about 1.2 meters (3 ft) long, but most species are far smaller. Description The Malapteruridae are the only group of catfish with well-developed electrogenic organs; however, electroreceptive systems are widespread in catfishes. The electrogenic organ is derived from anterior body musculature and lines the body cavity. Electric catf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malapterurus Electricus
''Malapterurus electricus'' is a thickset fish with six mouth barbels and a single fin on its back, just anterior to the rounded tail fin. It is brownish or grayish, irregularly spotted with black, and attains a length and weight of about and ''M. electricus'' is capable of generating and controlling the discharge of up to 450 volts of electricity. It uses its power to defend itself and to capture prey. Distribution In Africa, it occurs in the Nile and tropical Africa (exclusive of Lake Victoria), Lake Turkana, Lake Chad and Senegal basins. Biology Occurs among rock favors standing water. Active at night, feeding mainly on fish stunned by electric shocks. The electric organ, capable of discharging 300-400 V, is derived from pectoral muscle and surrounds almost the entire body. It is used both for prey capture and defense Life history This is an Old World catfish. It is reputed that Doctors in ancient Egypt used shocks from the Electric Catfish to reduce the pain of arthriti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrogenic
Electroreception and electrogenesis are the closely-related biological abilities to perceive electrical stimuli and to generate electric fields. Both are used to locate prey; stronger electric discharges are used in a few groups of fishes to stun prey. The capabilities are found almost exclusively in aquatic or amphibious animals, since water is a much better conductor of electricity than air. In passive electrolocation, objects such as prey are detected by sensing the electric fields they create. In active electrolocation, fish generate a weak electric field and sense the different distortions of that field created by objects that conduct or resist electricity. Active electrolocation is practised by two groups of weakly electric fish, the Gymnotiformes (knifefishes) and the Mormyridae (elephantfishes), and by ''Gymnarchus niloticus'', the African knifefish. An electric fish generates an electric field using an electric organ, modified from muscles in its tail. The field is c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Fish Of Africa
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. Fresh water i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malapteruridae
Electric catfish or Malapteruridae is a Family (biology), family of catfishes (order Siluriformes). This family includes two genus, genera, ''Malapterurus'' and ''Paradoxoglanis'', with 21 species. Several species of this family have the ability to bioelectricity, generate electricity, delivering a shock of up to 350 volts from its Electric organ (biology), electric organ. Electric catfish are found in tropical Africa and the Nile River. Electric catfish are usually nocturnal and carnivorous. Some species feed primarily on other fish, incapacitating their prey with electric discharges, but others are generalist bottom foragers, feeding on things like invertebrates, fish eggs, and detritus. The largest can grow to about 1.2 meters (3 ft) long, but most species are far smaller. Description The Malapteruridae are the only group of catfish with well-developed electrogenic organs; however, electroreceptive systems are widespread in catfishes. The electrogenic organ is derived from an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3100 BC
The 31st century BC was a century that lasted from the year 3100 BC to 3001 BC. Events *c. 3100 BC: Polo ( mni, Sagol Kangjei) was first played in Manipur state. *c. 3100 BC?: The Anu Ziggurat and White Temple are built in Uruk. *c. 3100 BC?: Predynastic period (Neolithic) ends in Ancient Egypt. *c. 3100 BC?: Early Dynastic (Archaic) period starts in Ancient Egypt. *c. 3100 BC?: The first Tarxien Temples, temple of Tarxien is in use by the Neolithic inhabitants of Malta. *c. 3100 BC?: First stage in the construction of Stonehenge. *c. 3100 BC – 2600 BC: Skara Brae, Orkney Islands, Scotland is inhabited. *c. 3090 BC: Narmer (Menes) unifies Upper Egypt, Upper and Lower Egypt into one country; he rules this new country from Memphis, Egypt, Memphis. *c. 3051 BC: The List of oldest trees, oldest currently living organism, a Pinus longaeva, Great Basin bristlecone pine, undergoes germination in the White Mountains (California), White Mountains of California. Inventions, discoveries ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Narmer
Narmer ( egy, Wiktionary:nꜥr-mr, nꜥr-mr, meaning "painful catfish," "stinging catfish," "harsh catfish," or "fierce catfish;" ) was an ancient Egyptian pharaoh of the Early Dynastic Period (Egypt), Early Dynastic Period. He was the successor to the Naqada III, Protodynastic king Ka (pharaoh), Ka. Many scholars consider him the unifier of Egypt and founder of the First Dynasty of Egypt, First Dynasty, and in turn the first king of a unified Egypt. He also had a prominently noticeable presence in Canaan, compared to his predecessors and successors. A majority of Egyptologists believe that Narmer was the same person as Menes.Neithhotep is thought to be his queen consort or his daughter. Historical identity Although highly interrelated, the questions of "who was Menes?" and "who unified Egypt?" are actually two separate issues. Narmer is often credited with the unification of Egypt by means of the conquest of Lower Egypt by Upper Egypt. While Menes is traditionally considered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mural Painting
A mural is any piece of graphic artwork that is painted or applied directly to a wall, ceiling or other permanent substrate. Mural techniques include fresco, mosaic, graffiti and marouflage. Word mural in art The word ''mural'' is a Spanish adjective that is used to refer to what is attached to a wall. The term ''mural'' later became a noun. In art, the word mural began to be used at the beginning of the 20th century. In 1906, Dr. Atl issued a manifesto calling for the development of a monumental public art movement in Mexico; he named it in Spanish ''pintura mural'' (English: ''wall painting''). In ancient Roman times, a mural crown was given to the fighter who was first to scale the wall of a besieged town. "Mural" comes from the Latin ''muralis'', meaning "wall painting". History Antique art Murals of sorts date to Upper Paleolithic times such as the cave paintings in the Lubang Jeriji Saléh cave in Borneo (40,000-52,000 BP), Chauvet Cave in Ardèche department ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthritis
Arthritis is a term often used to mean any disorder that affects joints. Symptoms generally include joint pain and stiffness. Other symptoms may include redness, warmth, swelling, and decreased range of motion of the affected joints. In some types of arthritis, other organs are also affected. Onset can be gradual or sudden. There are over 100 types of arthritis. The most common forms are osteoarthritis (degenerative joint disease) and rheumatoid arthritis. Osteoarthritis usually occurs with age and affects the fingers, knees, and hips. Rheumatoid arthritis is an autoimmune disorder that often affects the hands and feet. Other types include gout, lupus, fibromyalgia, and septic arthritis. They are all types of rheumatic disease. Treatment may include resting the joint and alternating between applying ice and heat. Weight loss and exercise may also be useful. Recommended medications may depend on the form of arthritis. These may include pain medications such as ibuprofen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Catfish In Mastaba Of Ti Bas-relief Detail
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. The presence of an electric charge, which can be either positive or negative, produces an electric field. The movement of electric charges is an electric current and produces a magnetic field. When a charge is placed in a location with a non-zero electric field, a force will act on it. The magnitude of this force is given by Coulomb's law. If the charge moves, the electric field would be doing work on the electric charge. Thus we can speak of electric potential at a certain point in space, which is equal to the work done by an external agent in carrying a unit of positiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gas Bladder
The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to expend energy in swimming. Also, the dorsal position of the swim bladder means the center of mass is below the center of volume, allowing it to act as a stabilizing agent. Additionally, the swim bladder functions as a resonating chamber, to produce or receive sound. The swim bladder is evolutionarily homologous to the lungs. Charles Darwin remarked upon this in ''On the Origin of Species''.Darwin, Charles (1859''Origin of Species''Page 190, reprinted 1872 by D. Appleton. Darwin reasoned that the lung in air-breathing vertebrates had derived from a more primitive swim bladder. In the embryonic stages, some species, such as redlip blenny, have lost the swim bladder again, mostly bottom dwellers like the weather fish. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbels
In fish anatomy and turtle anatomy, a barbel is a slender, whiskerlike sensory organ near the mouth. Fish that have barbels include the catfish, the carp, the goatfish, the hagfish, the sturgeon, the zebrafish, the black dragonfish and some species of shark such as the sawshark. Barbels house the taste buds of such fish and are used to search for food in murky water. The word "barbel" comes from the Middle Latin ''barbula'', for "little beard." Barbels are sometimes erroneously referred to as '' barbs'', which are found in bird feathers for flight. Barbels may be located in a variety of locations on the head of a fish. "Maxillary barbels" refers to barbels on either side of the mouth. Barbels may also be nasal, extending from the nostrils. Also, barbels are often mandibular or mental, being located on the chin. In fish, barbels can take the form of small, fleshy protrusions or long, cylindrical shaped extensions of the head of a fish. The cylindrical barbel shapes are buil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
