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PKa
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PKA may refer to: * Professionally known as: ** Pen name ** Stage persona * p''K''a, the symbol for the acid dissociation constant at logarithmic scale * Protein kinase A, a class of cAMP-dependent enzymes * Pi Kappa Alpha, the North-American social fraternity * Public key authentication, establishing key authenticity in public-key cryptography * Professional Karate Association * Primary knock-on atom, an atom that is displaced from its lattice site by irradiation *Painkiller Already, a podcast featuring FPSRussia * Pentax KA-mount, a camera lens mount Non-Latin *The Latin letters ''PKA'' are visually similar to the Cyrillic acronym ', the Russian Federal Space Agency The State Space Corporation "Roscosmos" (russian: Государственная корпорация по космической деятельности «Роскосмос»), commonly known simply as Roscosmos (russian: Роскосмос) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pen Name
A pen name, also called a ''nom de plume'' or a literary double, is a pseudonym (or, in some cases, a variant form of a real name) adopted by an author and printed on the title page or by-line of their works in place of their real name. A pen name may be used to make the author's name more distinctive, to disguise the author's gender, to distance the author from their other works, to protect the author from retribution for their writings, to merge multiple persons into a single identifiable author, or for any of a number of reasons related to the marketing or aesthetic presentation of the work. The author's real identity may be known only to the publisher or may become common knowledge. Etymology The French-language phrase is occasionally still seen as a synonym for the English term "pen name", which is a "back-translation" and originated in England rather than France. H. W. Fowler and F. G. Fowler, in ''The King's English'' state that the term ''nom de plume'' evolv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stage Persona
A persona (plural personae or personas), depending on the context, is the public image of one's personality, the social role that one adopts, or simply a fictional character. The word derives from Latin, where it originally referred to a theatrical mask. On the social web, users develop virtual personas as online identities. Etymology The Latin word probably derived from the Etruscan word "", with the same meaning, and that from the Greek ('). Its meaning in the latter Roman period changed to indicate a "character" of a theatrical performance or court of law, when it became apparent that different individuals could assume the same role and that legal attributes such as rights, powers, and duties followed the role. The same individuals as actors could play different roles, each with its own legal attributes, sometimes even in the same court appearance. According to other sources, which also admit that the origin of the term is not completely clear, ''persona'' could be relat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protein Kinase A
In cell biology, protein kinase A (PKA) is a family of enzymes whose activity is dependent on cellular levels of cyclic AMP (cAMP). PKA is also known as cAMP-dependent protein kinase (). PKA has several functions in the cell, including regulation of glycogen, sugar, and lipid metabolism. It should not be confused with 5'-AMP-activated protein kinase (AMP-activated protein kinase). History Protein kinase A, more precisely known as adenosine 3',5'-monophosphate (cyclic AMP)-dependent protein kinase, abbreviated to PKA, was discovered by chemists Edmond H. Fischer and Edwin G. Krebs in 1968. They won the Nobel Prize in Physiology or Medicine in 1992 for their work on phosphorylation and dephosphorylation and how it relates to PKA activity. PKA is one of the most widely researched protein kinases, in part because of its uniqueness; out of 540 different protein kinase genes that make up the human kinome, only one other protein kinase, casein kinase 2, is known to exist in a physio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pi Kappa Alpha
Pi Kappa Alpha (), commonly known as PIKE, is a college fraternity founded at the University of Virginia in 1868. The fraternity has over 225 chapters and colonies across the United States and abroad with over 15,500 undergraduate members over 300,000 lifetime initiates. History Pi Kappa Alpha was founded on March 1, 1868, in Room 47 in West Range ( The Range) at the University of Virginia by six graduate students: Three of the Founders had been former cadets, having served on both sides of the recently concluded Civil War. One had been a Union hospital officer, another a Confederate veteran, and a third, a repatriate. Expansion was considered early in the fraternity's history; on March 1, 1869, exactly one year after the ''Alpha chapter'' at the University of Virginia was formed, the ''Beta chapter'' of Pi Kappa Alpha was founded at Davidson College. Its ''Gamma chapter'' was placed at William and Mary just two years later, and a total of seven chapters formed in the first d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public-key Cryptography
Public-key cryptography, or asymmetric cryptography, is the field of cryptographic systems that use pairs of related keys. Each key pair consists of a public key and a corresponding private key. Key pairs are generated with cryptographic algorithms based on mathematical problems termed one-way functions. Security of public-key cryptography depends on keeping the private key secret; the public key can be openly distributed without compromising security. In a public-key encryption system, anyone with a public key can encrypt a message, yielding a ciphertext, but only those who know the corresponding private key can decrypt the ciphertext to obtain the original message. For example, a journalist can publish the public key of an encryption key pair on a web site so that sources can send secret messages to the news organization in ciphertext. Only the journalist who knows the corresponding private key can decrypt the ciphertexts to obtain the sources' messages—an eavesdropp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Professional Karate Association
The Professional Karate Association (PKA), later Professional Karate & Kickboxing Association, now--effective March 1, 2022 PKA Worldwide--was originally a martial arts sanctioning organization, now transformed into a martial arts promotion company. Through the 1970s, the PKA was the major professional kickboxing organization in the United States and in Europe, featuring such fighters as Bill "Superfoot" Wallace, Joe Lewis, Benny "the Jet" Urquidez, The Iceman Jean-Yves Thériault, Dennis "the Terminator" Alexio, Rick "the Jet" Roufus, Scott "The Hammer" Bennington, Jerry Trimble and Jeff Smith. The Professional Karate Association was formed in 1974 by Don and Judy Quine in association with Mike Anderson. Corcoran, John and Farkas, Emil. Martial Arts: Traditions, History, People. Gallery Books, New York (1983) p. 317 It was launched with the initial world championships in 1974 at the Los Angeles Sports Arena, and was telecast on ABC's Wide World of Entertainment. The w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Primary Knock-on Atom
In condensed-matter physics, a primary knock-on atom (PKA) is an atom that is displaced from its lattice site by irradiation; it is, by definition, the first atom that an incident particle encounters in the target. After it is displaced from its initial lattice site, the PKA can induce the subsequent lattice site displacements of other atoms if it possesses sufficient energy (threshold displacement energy), or come to rest in the lattice at an interstitial site if it does not (interstitial defect). Most of the displaced atoms resulting from electron irradiation and some other types of irradiation are PKAs, since these are usually below the threshold displacement energy and therefore do not have sufficient energy to displace more atoms. In other cases like fast neutron irradiation, most of the displacements result from higher-energy PKAs colliding with other atoms as they slow down to rest. Collision Models Atoms can only be displaced if, upon bombardment, the energy they recei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FPSRussia
Kyle Lamar Myers (born May 9, 1986) is an American podcaster and former YouTuber known under the stage name FPSRussia and FPSKyle. His YouTube channel features Myers portraying the fictional role of Dimitri Potapov, a heavily accented "professional Russian" from Moscow. His videos center around the usage of large amounts of firearms and explosives. The FPSRussia channel launched in April 2010 and found success early, reaching one million subscribers in June 2011. Myers ceased producing new videos in 2016 following the unsolved death of one of his associates and a Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) felony charge. As of August 2022, his channel has still garnered over 6.9 million subscribers and 950 million views. Since the FPSRussia channel has gone inactive, Myers continues to maintain an online presence as the co-host of ''Painkiller Already'' (''PKA''), a podcast he co-founded in 2010. Channel history Background and early success Before Myers started F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax K-mount
The Pentax K-mount, sometimes referred to as the "PK-mount", is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, and has since been used by all Pentax 35 mm and digital SLRs and also the MILC Pentax K-01. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras. Mounts The Pentax K-mount has undergone a number of evolutions over the years as new functionality has been added. In general, the term K-mount may refer to the original K-mount, or to all its variations. Originally designed by Zeiss for an alliance with Pentax, it was intended to be a common lens mount for a proposed series of cameras and lenses. However, the plan failed to work out and the two firms parted company amicably, but Pentax retained the lens mount and at least one Zeiss lens design for its own use. K-mount The original K-mount is a simple bayonet con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
