Aggeraspis

Last updated

Aggeraspis
Temporal range: Early Devonian
Aggeraspis heintzi.jpg
An artist's representation of Aggeraspis heintzi
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Placodermi
Order: Arthrodira
Family: Phlyctaeniidae
Genus: Aggeraspis
Gross, 1962
Type species
Aggeraspis brevis
Gross, 1933

Aggeraspis is an extinct genus of arthrodire placoderm fish, which lived during the Early Devonian period in Europe. [1]

Related Research Articles

Calculus is the mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations.

The derivative is a fundamental tool of calculus that quantifies the sensitivity of change of a function's output with respect to its input. The derivative of a function of a single variable at a chosen input value, when it exists, is the slope of the tangent line to the graph of the function at that point. The tangent line is the best linear approximation of the function near that input value. For this reason, the derivative is often described as the instantaneous rate of change, the ratio of the instantaneous change in the dependent variable to that of the independent variable. The process of finding a derivative is called differentiation.

H. G. Wells English writer (1866–1946)

Herbert George Wells was an English writer. Prolific in many genres, he wrote more than fifty novels and dozens of short stories. His non-fiction output included works of social commentary, politics, history, popular science, satire, biography, and autobiography. Wells' science fiction novels are so well regarded that he has been called the "father of science fiction".

<span class="mw-page-title-main">H</span> 8th letter of the Latin alphabet

H, or h, is the eighth letter of the Latin alphabet, used in the modern English alphabet, including the alphabets of other western European languages and others worldwide. Its name in English is aitch, or regionally haitch.

pH Measure of the level of acidity or basicity of an aqueous solution

In chemistry, pH, also referred to as acidity or basicity, historically denotes "potential of hydrogen". It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions are measured to have lower pH values than basic or alkaline solutions.

<span class="mw-page-title-main">Quantum mechanics</span> Description of physical properties at the atomic and subatomic scale

Quantum mechanics is a fundamental theory in physics that describes the behavior of nature at and below the scale of atoms. It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.

<span class="mw-page-title-main">Uncertainty principle</span> Foundational principle in quantum physics

The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known. In other words, the more accurately one property is measured, the less accurately the other property can be known.

<span class="mw-page-title-main">Magnetic field</span> Distribution of magnetic force

A magnetic field is a physical field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets. In addition, a nonuniform magnetic field exerts minuscule forces on "nonmagnetic" materials by three other magnetic effects: paramagnetism, diamagnetism, and antiferromagnetism, although these forces are usually so small they can only be detected by laboratory equipment. Magnetic fields surround magnetized materials, electric currents, and electric fields varying in time. Since both strength and direction of a magnetic field may vary with location, it is described mathematically by a function assigning a vector to each point of space, called a vector field.

Atmospheric pressure, also known as air pressure or barometric pressure, is the pressure within the atmosphere of Earth. The standard atmosphere is a unit of pressure defined as 101,325 Pa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth; that is, the Earth's atmospheric pressure at sea level is approximately 1 atm.

<span class="mw-page-title-main">Corrosion</span> Gradual destruction of materials by chemical reaction with its environment

Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials by chemical or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion.

<i>M*A*S*H</i> (TV series) American war comedy-drama TV series (1972–1983)

M*A*S*H is an American war comedy drama television series that aired on CBS from September 17, 1972, to February 28, 1983. It was developed by Larry Gelbart as the first original spin-off series adapted from the 1970 feature film M*A*S*H, which, in turn, was based on Richard Hooker's 1968 novel MASH: A Novel About Three Army Doctors. The series, which was produced with 20th Century Fox Television for CBS, follows a team of doctors and support staff stationed at the "4077th Mobile Army Surgical Hospital" in Uijeongbu, South Korea, during the Korean War (1950–53).

<i>Helicobacter pylori</i> Species of bacteria

Helicobacter pylori, previously known as Campylobacter pylori, is a gram-negative, flagellated, helical bacterium. Mutants can have a rod or curved rod shape, and these are less effective. Its helical body is thought to have evolved in order to penetrate the mucous lining of the stomach, helped by its flagella, and thereby establish infection. The bacterium was first identified as the causal agent of gastric ulcers in 1983 by the Australian doctors Barry Marshall and Robin Warren.

<span class="mw-page-title-main">H&M</span> Swedish multinational clothing retail company

H & M Hennes & Mauritz AB, also known as H&M Group, is a multinational clothing company based in Sweden that focuses on fast-fashion clothing. As of 23 June 2022, H&M Group operated in 75 geographical markets with 4,801 stores under the various company brands, with 107,375 full-time equivalent positions.

<span class="mw-page-title-main">Triple H</span> American business executive and former professional wrestler (born 1969)

Paul Michael Levesque, better known by the ring name Triple H, is an American business executive, actor, and retired professional wrestler. Regarded as one of the greatest professional wrestlers of all time, he is the current chief content officer and head of creative for WWE.

<span class="mw-page-title-main">William H. Macy</span> American actor (born 1950)

William Hall Macy Jr. is an American actor. His film career has been built on appearances in small, independent films, though he has also appeared in mainstream films. His starring roles include those in Fargo (1996), Boogie Nights (1997), Magnolia (1999), Mystery Men (1999), Jurassic Park III (2001), Cellular (2004), Bobby (2006), Wild Hogs (2007), and Kingdom of the Planet of the Apes (2024).

<i>Homo</i> Genus of hominins that includes humans and their closest extinct relatives

Homo is a genus of great ape that emerged from the genus Australopithecus and encompasses the extant species Homo sapiens and a number of extinct species classified as either ancestral or closely related to modern humans. These include Homo erectus and Homo neanderthalensis. The oldest member of the genus is Homo habilis, with records of just over 2 million years ago. Homo, together with the genus Paranthropus, is probably most closely related to the species Australopithecus africanus within Australopithecus. The closest living relatives of Homo are of the genus Pan, with the ancestors of Pan and Homo estimated to have diverged around 5.7-11 million years ago during the Late Miocene.

<span class="mw-page-title-main">WWE Championship</span> Mens professional wrestling world championship

The WWE Championship is a men's professional wrestling world heavyweight championship created and promoted by the American promotion WWE, defended on the SmackDown brand division. Since April 2022, the title has been jointly held and defended with the WWE Universal Championship as the Undisputed WWE Universal Championship, but both titles have maintained their individual lineages. It is one of three world titles in WWE, alongside its companion Universal Championship on SmackDown, and the World Heavyweight Championship on Raw. The current champion is Cody Rhodes, who is in his first reign. He won the undisputed title by defeating previous champion Roman Reigns in a Bloodline Rules match at WrestleMania XL Night 2 on April 7, 2024.

The h-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The h-index correlates with success indicators such as winning the Nobel Prize, being accepted for research fellowships and holding positions at top universities. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications. The index has more recently been applied to the productivity and impact of a scholarly journal as well as a group of scientists, such as a department or university or country. The index was suggested in 2005 by Jorge E. Hirsch, a physicist at UC San Diego, as a tool for determining theoretical physicists' relative quality and is sometimes called the Hirsch index or Hirsch number.

The Planck constant, or Planck's constant, denoted by , is a fundamental physical constant of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.

<span class="mw-page-title-main">RB Leipzig</span> German association football club

RasenBallsport Leipzig e.V., commonly known as RB Leipzig, is a German professional football club based in Leipzig, Saxony. The club was founded in 2009 by the initiative of the company Red Bull GmbH, which purchased the playing rights of fifth-tier side SSV Markranstädt with the intent of advancing the new club to the top-flight Bundesliga within eight years. The men's professional football club is run by the spin-off organization RasenBallsport Leipzig GmbH. RB Leipzig plays its home matches at the Red Bull Arena. The club nickname is Die Roten Bullen.

References

  1. McGinnis, C. L. Camp, H. J. Allison, R. H. Nichols, and H. (1968). Bibliography of Fossil Vertebrates 1959-1963. Geological Society of America. ISBN   9780813711171.{{cite book}}: CS1 maint: multiple names: authors list (link)