Precursor (chemistry)In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound. In biochemistry, the term "precursor" often refers more specifically to a chemical compound preceding another in a metabolic pathway, such as a protein precursor.Precursor (bird)"Precursor" is a controversial prehistoric birdgenus from the Early Eocene. It was established based on fossils found in England, including in the famous London Clay deposits. Three species are included in the genus: "P." parvus, the type species, "P." magnus, and "P." litorum, all named by Colin Harrison and Cyril Walker in 1977.
Precursor (physics)Precursors are characteristic wave patterns caused by dispersion of an impulse's frequency components as it propagates through a medium. Classically, precursors precede the main signal, although in certain situations they may also follow it. Precursor phenomena exist for all types of waves, as their appearance is only predicated on the prominence of dispersion effects in a given mode of wave propagation.Course (medicine)In medicine the term course generally takes one of two meanings, both reflecting the sense of "path that something or someone moves along...process or sequence or steps": A course of medication is a period of continual treatment with drugs, sometimes with variable dosage and in particular combinations. For instance treatment with some drugs should not end abruptly. Instead, their course should end with a tapering dosage.Elder raceAn elder or progenitor race, in science fiction, fantasy, or horror fiction, is an ancient race that not only preceded but helped shape the races that followed, often playing a significant role in the basis of the story. Humanity may have been descended from them, or they may be a different fictional race, such as elves, dwarves, or aliens.
Precursor cellIn cell biology, precursor cells—also called blast cells—are partially differentiated, or intermediate, and are sometimes referred to as progenitor cells. A precursor cell is a stem cell with the capacity to differentiate into only one cell type, meaning they are unipotent stem cells. In embryology, precursor cells are a group of cells that later differentiate into one organ. However, progenitor cells are considered multipotent.Gehrlein PrecursorThe Gehrlein Precursor is an American, high-wing, single seat glider designed by in 1965 and assembled from Schweizer Aircraft parts. Design and developmentThere was just one Schweizer 1-23C built and it was owned and modified by Gehrlein. The aircraft was crashed and rebuilt with new 1-23D wings. The 1-23C's damaged wings were rebuilt and formed the basis for the Precursor.
Star ControlStar Control: Famous Battles of the Ur-Quan Conflict, Volume IV is an action-strategy video game developed by Toys for Bob and published by Accolade. It was originally released for MS-DOS and Amiga in 1990, followed by ports for the Sega Genesis and additional platforms in 1991. The story is set during an interstellar war between two space alien factions, with humanity joining the Alliance of Free Stars to defeat the invading Ur-Quan Hierarchy.
Cosmic EncounterCosmic Encounter is a science fiction–themed strategyboard game designed by "Future Pastimes" (collectively, Peter Olotka, Jack Kittredge and Bill Eberle, with Bill Norton) and originally published by Eon Games in 1977. In it, each player takes the role of a particular alien species, each with a unique power to bend or break one of the rules of the game, trying to establish control over the universe.
Extraterrestrial intelligenceExtraterrestrial intelligence (ETI) refers to hypothetical beings – extraterrestrial life or more artificial beings – having the intelligence to perform similar cognitive abilities as humans. No such life has ever been verifiably observed to exist. The question of whether other inhabited worlds might exist has been debated since ancient history.Halo (franchise)Halo is an American military science fiction video game series and media franchise, originally developed by Bungie and currently managed and developed by Activision and Halo Studios (previously 343 Industries), part of Microsoft's Xbox Game Studios. The series launched in November 2001 with the first-person shooter video game Halo: Combat Evolved and its tie-in novel, The Fall of Reach.Foreigner seriesThe Foreigner series is a science fiction book series set in a fictional universe created by American writer C. J. Cherryh. The series centers on the descendants of a ship lost in transit from Earth en route to found a new space station. It consists of a series of semi-encapsulated trilogy arcs (or sequences) that focus on the life of Bren Cameron, the human paidhi, a translator-diplomat to the court of the ruling atevi species.
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