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ARF GTPase
ARF may refer to: Organizations * Advertising Research Foundation * Animal Rescue Foundation * Armenian Revolutionary Federation * ASEAN Regional Forum People * Cahit Arf (1910–1997), Turkish mathematician Science, medicine, and mathematics * Acute renal failure * Acute rheumatic fever * ADP ribosylation factor, a small GTP-binding protein * The Arf invariant in mathematics * Argon fluoride laser or ArF laser * Atomic Resonance Filter or atomic line filter * Auxin Response Factors in plants * p14arf or ARF tumor suppressor Other uses * Arf (''Nanoha''), character in ''Magical Girl Lyrical Nanoha'' * Abuse Reporting Format * Almost-Ready-to-Fly model aircraft A model aircraft is a small unmanned aircraft. Many are replicas of real aircraft. Model aircraft are divided into two basic groups: flying and non-flying. Non-flying models are also termed static, display, or shelf models. Aircraft manufactur ... * The Azkena Rock Festival, Vitoria-Gasteiz, Spain {{Disambigu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Advertising Research Foundation
The Advertising Research Foundation (ARF) is a nonprofit industry association for creating, aggregating, and sharing knowledge in the fields of advertising and mass media. It was founded in 1936 by the Association of National Advertisers and the American Association of Advertising Agencies. Its stated mission is to improve the practice of advertising, marketing and media research in pursuit of more effective marketing and advertising communications. Its membership consists of over 400 advertisers, advertising agencies, research firms, media companies, educational institutions and international organizations. The ARF conducts several research initiatives. It publishes the ''Journal of Advertising Research'', a peer-reviewed academic periodical. It also sponsors a variety of advertising-related marketing research endeavours and hosts periodic conferences on advertising and media-related topics. The ARF operates the ''Roy Morgan Information Center'' as a clearinghouse for advertisin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal Rescue Foundation
Tony La Russa's Animal Rescue Foundation (ARF) is a nonprofit organization founded by Elaine and Tony La Russa, based in Walnut Creek, California. ARF rescues dogs and cats from public shelters where they would otherwise be euthanized and adopts them into new homes. Their programs include a spay and neuter clinic, training classes, service dog training for military veterans, a volunteer therapy dog program, and humane education programs for children. On May 7, 1990, during the opening game for Major League Baseball teams Oakland Athletics and the New York Yankees, a stray cat wandered onto the playing field at Oakland–Alameda County Coliseum. The game was halted as the cat ran around the field. La Russa (then manager of the A's) coaxed the cat into the dugout, and began looking for a local shelter to re-home the cat. Tony and Elaine could not find a shelter, and learned that the cat would most likely be euthanized. They decided to open their own shelter, and in February of the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armenian Revolutionary Federation
The Armenian Revolutionary Federation ( hy, Հայ Յեղափոխական Դաշնակցութիւն, ՀՅԴ ( classical spelling), abbr. ARF or ARF-D) also known as Dashnaktsutyun (collectively referred to as Dashnaks for short), is an Armenian nationalist and socialist political party founded in 1890 in Tiflis, Russian Empire (now Tbilisi, Georgia) by Christapor Mikaelian, Stepan Zorian, and Simon Zavarian. Today the party operates in Armenia, Artsakh, Lebanon, Iran and in countries where the Armenian diaspora is present. Although it has long been the most influential political party in the Armenian diaspora, it has a comparatively smaller presence in modern-day Armenia. As of October 2021, the party was represented in three national parliaments with ten seats in the National Assembly of Armenia, three seats in the National Assembly of Artsakh and three seats in the Parliament of Lebanon as part of the March 8 Alliance. The ARF has traditionally advocated socialist democracy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASEAN Regional Forum
ASEAN ( , ), officially the Association of Southeast Asian Nations, is a political and economic union of 10 member states in Southeast Asia, which promotes intergovernmental cooperation and facilitates economic, political, security, military, educational, and sociocultural integration between its members and countries in the Asia-Pacific. The union has a total area of and an estimated total population of about 668million. ASEAN's primary objective was to accelerate economic growth and through that social progress and cultural development. A secondary objective was to promote regional peace and stability based on the rule of law and the principles of the UN Charter. With some of the fastest growing economies in the world, ASEAN has broadened its objective beyond the economic and social spheres. In 2003, ASEAN moved along the path similar to the European Union (EU) by agreeing to establish an ASEAN community that consists of three pillars: the ASEAN Security Community, the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cahit Arf
Cahit Arf (; 24 October 1910 – 26 December 1997) was a Turkish mathematician. He is known for the Arf invariant of a quadratic form in characteristic 2 (applied in knot theory and surgery theory) in topology, the Hasse–Arf theorem in ramification theory, Arf semigroups and Arf rings. Biography Cahit Arf was born on 11 October 1910 in Selanik (Thessaloniki), which was then a part of the Ottoman Empire. His family migrated to Istanbul with the outbreak of the Balkan War in 1912. The family finally settled in İzmir where Cahit Arf received his primary education. Upon receiving a scholarship from the Turkish Ministry of Education he continued his education in Paris and graduated from École Normale Supérieure. Returning to Turkey, he taught mathematics at Galatasaray High School. In 1933 he joined the Mathematics Department of Istanbul University. In 1937 he went to Göttingen, where he received his PhD from the University of Göttingen and he worked with Helmut Has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acute Renal Failure
Acute kidney injury (AKI), previously called acute renal failure (ARF), is a sudden decrease in kidney function that develops within 7 days, as shown by an increase in serum creatinine or a decrease in urine output, or both. Causes of AKI are classified as either prerenal (due to decreased blood flow to the kidney), intrinsic renal (due to damage to the kidney itself), or postrenal (due to blockage of urine flow). Prerenal causes of AKI include sepsis, dehydration, excessive blood loss, cardiogenic shock, heart failure, cirrhosis, and certain medications like ACE inhibitors or NSAIDs. Intrinsic renal causes of AKI include glomerulonephritis, lupus nephritis, acute tubular necrosis, certain antibiotics, and chemotherapeutic agents. Postrenal causes of AKI include kidney stones, bladder cancer, neurogenic bladder, enlargement of the prostate, narrowing of the urethra, and certain medications like anticholinergics. The diagnosis of AKI is made based on a person's signs and symptom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acute Rheumatic Fever
Rheumatic fever (RF) is an inflammatory disease that can involve the heart, joints, skin, and brain. The disease typically develops two to four weeks after a streptococcal throat infection. Signs and symptoms include fever, multiple painful joints, involuntary muscle movements, and occasionally a characteristic non-itchy rash known as erythema marginatum. The heart is involved in about half of the cases. Damage to the heart valves, known as rheumatic heart disease (RHD), usually occurs after repeated attacks but can sometimes occur after one. The damaged valves may result in heart failure, atrial fibrillation and infection of the valves. Rheumatic fever may occur following an infection of the throat by the bacterium ''Streptococcus pyogenes''. If the infection is left untreated, rheumatic fever occurs in up to three percent of people. The underlying mechanism is believed to involve the production of antibodies against a person's own tissues. Due to their genetics, some peop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ADP Ribosylation Factor
ADP ribosylation factors (ARFs) are members of the ARF family of GTP-binding proteins of the Ras superfamily. ARF family proteins are ubiquitous in eukaryotic cells, and six highly conserved members of the family have been identified in mammalian cells. Although ARFs are soluble, they generally associate with membranes because of N-terminus myristoylation. They function as regulators of vesicular traffic and actin remodelling. The small ADP ribosylation factor (Arf) GTP-binding proteins are major regulators of vesicle biogenesis in intracellular traffic. They are the founding members of a growing family that includes Arl (Arf-like), Arp (Arf-related proteins) and the remotely related Sar (Secretion-associated and Ras-related) proteins. Arf proteins cycle between inactive GDP-bound and active GTP-bound forms that bind selectively to effectors. The classical structural GDP/GTP switch is characterised by conformational changes at the so-called switch 1 and switch 2 regions, whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arf Invariant
In mathematics, the Arf invariant of a nonsingular quadratic form over a field of characteristic 2 was defined by Turkish mathematician when he started the systematic study of quadratic forms over arbitrary fields of characteristic 2. The Arf invariant is the substitute, in characteristic 2, for the discriminant for quadratic forms in characteristic not 2. Arf used his invariant, among others, in his endeavor to classify quadratic forms in characteristic 2. In the special case of the 2-element field F2 the Arf invariant can be described as the element of F2 that occurs most often among the values of the form. Two nonsingular quadratic forms over F2 are isomorphic if and only if they have the same dimension and the same Arf invariant. This fact was essentially known to , even for any finite field of characteristic 2, and Arf proved it for an arbitrary perfect field. The Arf invariant is particularly applied in geometric topology, where it is primarily used to define an invari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argon Fluoride Laser
The argon fluoride laser (ArF laser) is a particular type of excimer laser, which is sometimes (more correctly) called an exciplex laser. With its 193-nanometer wavelength, it is a deep ultraviolet laser, which is commonly used in the production of semiconductor integrated circuits, eye surgery, micromachining, and scientific research. "Excimer" is short for "excited dimer", while "exciplex" is short for "excited complex". An excimer laser typically uses a mixture of a noble gas (argon, krypton, or xenon) and a halogen gas (fluorine or chlorine), which under suitable conditions of electrical stimulation and high pressure, emits coherent stimulated radiation (laser light) in the ultraviolet range. ArF (and KrF) excimer lasers are widely used in high-resolution photolithography machines, a critical technology for microelectronic chip manufacturing. Excimer laser lithography has enabled transistor feature sizes to shrink from 800 nanometers in 1990 to 7 nanometers in 2018. Extreme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atomic Line Filter
An atomic line filter (ALF) is a more effective optical band-pass filter used in the physical sciences for filtering electromagnetic radiation with precision, accuracy, and minimal signal strength loss. Atomic line filters work via the absorption or resonance lines of atomic vapors and so may also be designated an atomic resonance filter (ARF). The three major types of atomic line filters are absorption-re-emission ALFs, Faraday filters and Voigt filters. Absorption-re-emission filters were the first type developed, and so are commonly called simply "atomic line filters"; the other two types are usually referred to specifically as "Faraday filters" or "Voigt filters". Atomic line filters use different mechanisms and designs for different applications, but the same basic strategy is always employed: by taking advantage of the narrow lines of absorption or resonance in a metallic vapor, a specific frequency of light bypasses a series of filters that block all other light. Atomic l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auxin
Auxins (plural of auxin ) are a class of plant hormones (or plant-growth regulators) with some morphogen-like characteristics. Auxins play a cardinal role in coordination of many growth and behavioral processes in plant life cycles and are essential for plant body development. The Dutch biologist Frits Warmolt Went first described auxins and their role in plant growth in the 1920s. Kenneth V. Thimann became the first to isolate one of these phytohormones and to determine its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, ''Phytohormones'', in 1937. Overview Auxins were the first of the major plant hormones to be discovered. They derive their name from the Greek word αυξειν (''auxein'' – "to grow/increase"). Auxin is present in all parts of a plant, although in very different concentrations. The concentration in each position is crucial developmental information, so it is subject to tight regulation through both meta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
