Hopf bifurcationIn the mathematical theory of bifurcations, a Hopf bifurcation is a critical point where, as a parameter changes, a system's stability switches and a periodic solution arises. More accurately, it is a local bifurcation in which a fixed point of a dynamical system loses stability, as a pair of complex conjugate eigenvalues—of the linearization around the fixed point—crosses the complex plane imaginary axis as a parameter crosses a threshold value.
Adenosine diphosphateAdenosine diphosphate (ADP), also known as adenosine pyrophosphate (APP), is an important organic compound in metabolism and is essential to the flow of energy in living cells. ADP consists of three important structural components: a sugar backbone attached to adenine and two phosphate groups bonded to the 5 carbon atom of ribose. The diphosphate group of ADP is attached to the 5’ carbon of the sugar backbone, while the adenine attaches to the 1’ carbon. ADP can be interconverted to adenosine triphosphate (ATP) and adenosine monophosphate (AMP).
1 − 2 + 3 − 4 + ⋯In mathematics, 1 − 2 + 3 − 4 + ··· is an infinite series whose terms are the successive positive integers, given alternating signs. Using sigma summation notation the sum of the first m terms of the series can be expressed as The infinite series diverges, meaning that its sequence of partial sums, (1, −1, 2, −2, 3, ...), does not tend towards any finite limit. Nonetheless, in the mid-18th century, Leonhard Euler wrote what he admitted to be a paradoxical equation: A rigorous explanation of this equation would not arrive until much later.
Ice–albedo feedbackIce–albedo feedback is a positive feedback climate process where a change in the area of ice caps, glaciers, and sea ice alters the albedo and surface temperature of a planet. Ice is very reflective, therefore it reflects far more solar energy back to space than the other types of land area or open water. Ice–albedo feedback plays an important role in global climate change. For instance, at higher latitudes, warmer temperatures melt the ice sheets.
Society for Developmental BiologyThe Society for Developmental Biology (SDB), originally the Society for the Study of Development and Growth, is a professional society for scientists and professionals around the world whose research is focused on the study of the developmental biology, embryology, and related disciplines. The "Society for the Study of Development and Growth" (SDB) was founded in 1939. In August 1939, the SDB held its first conference, a symposium on Development and Growth, in a small village schoolhouse in North Truro, Massachusetts.
Academy of Christian Humanism UniversityThe Academy of Christian Humanism University (UAHC) (Universidad Academia de Humanismo Cristiano) is a Chilean non-profit private university, founded in 1988 but whose origins date back to 1975 when establishing the Academy of Christian Humanism, led by Cardinal Raúl Silva Henríquez (SDB), whose purpose was to bring together a group of intellectuals to discuss the politics, society, economy and culture of Chile.
1 Special Service Battalion1 Special Service Battalion (usually abbreviated to ()) is an armoured regiment of the South African Army and only one of two such in its regular force. The Regiment is based at Tempe near Bloemfontein. It was previously known in Afrikaans as 1 Spesiale Diens Bataljon (1 SDB). Special Service Battalion Following World War II, the Special Service Battalion was re-organised into 2 battalions - 1 Special Service Battalion and 1 South African Infantry Battalion.
Ad van LuynAdrianus Herman (Ad) van Luyn, SDB, (born 10 August 1935) is a Dutch prelate of the Catholic Church. He was the Bishop of Rotterdam from 1994 to 2011 and President of the Commission of the Bishops' Conferences of the European Community from 2006 to 2011. Van Luyn was born in Groningen and attended the seminary of the Salesians in Ugchelen. He made his religious vows in 1954. He studied theology at the Salesian Pontifical University in Turin. He was ordained to the priesthood in 1964 by Giuseppe Beltrami, apostolic nuncio to the Netherlands.
RennesRennes (ʁɛn; Roazhon ˈrwɑːõn; Gallo: Resnn; Condate Redonum) is a city in the east of Brittany in northwestern France at the confluence of the Ille and the Vilaine. Rennes is the prefecture of the region of Brittany, as well as the Ille-et-Vilaine department. In 2017, the urban area had a population of 357,327 inhabitants, and the larger metropolitan area had 739,974 inhabitants. The inhabitants of Rennes are called Rennais (masculine) or Rennaises (feminine) in French.
Mirrors and ReflectionsMirrors and Reflections: The Geometry of Finite Reflection Groups is an undergraduate-level textbook on the geometry of reflection groups. It was written by Alexandre V. Borovik and Anna Borovik and published in 2009 by Springer in their Universitext book series. The Basic Library List Committee of the Mathematical Association of America has recommended its inclusion in undergraduate mathematics libraries. Mirrors and Reflections is divided into five major parts, with two appendices.
Léon LayaLéon Laya (c.1810 in Paris – 5 September 1872 in Paris) was a 19th-century French playwright. The académicien Jean-Louis Laya was his father. Léon Laya was the author of a number of successful comedies, alternating between the delicacy or purity of the idea and the vivacity of the form : Une Maîtresse anonyme, in 2 acts (1812) ; la Peau du lion, in 2 acts (1814) ; les Cœurs d’or, in 3 acts, with Prémaray (Gymnase, 1854) ; les Jeunes gens, in 3 acts, free and independent adaptation of Terence's Adelphoe (Théâtre-Français, 1855) ; le duc Job, in 4 acts, one of the most sustained successes of the Théâtre-Français (1859) ; la Loi du cœur (Théâtre-Français, 1862), etc.
Brigade de Fusiliers MarinsThe Brigade des Fusiliers Marins was a unit of the French Navy which fought alongside the Belgium Army in 1914-1915 and which held their ground until the last man standing in October 1914 at Diksmuide to halt the advance of the German army and protect Dunkirk. When war was declared in August 1914, the French Navy housed idle Fusiliers Marins on board naval ships, due to the principal combats being conducted on land.
