the Chemical Brothers: Along with the Prodigy, the Chemical Brothers were trailblazers for “electronica,” a media and music industry buzzword for a disparate bunch of British posttechno acts belatedly impacting the American mainstream. The triumph was sweet but brief. By 1999 the electronica–big beat sound had been codified by copyists…

virus: Infectious patterns: …this stage is called the prodromal period of the illness. During the next few days, the virus enters the draining lymph nodes and then the bloodstream, where it is spread throughout the tissues of the body, resulting in fever and rash (in the case of measles and chickenpox) and inflammation…

community ecology: The study of coevolution: …between moths of the family Prodoxidae and their host plants illustrates the interplay of phylogeny and ecology. Prodoxid moths include some species that have become major pollinators of plants. These pollinators include yucca moths (of the genera Tegeticula and Parategeticula) and Greya moths (see above Commensalism and other types of…

yucca moth, (genus Tegeticula), any of four species of insects of the Prodoxidae family of moths (order Lepidoptera). The adults are small, diurnal, and have tiny spines covering their wings. Each of the four species is adapted to a particular species of yucca. The moths emerge when the yucca

yucca moth: Larvae of the related bogus yucca moth (Prodoxus) feed in the stems and seed capsules of the yucca plant and also attack the century plant.

migraine: Causes and symptoms: …cluster of symptoms, or “prodrome,” hours before the onset of the migraine headache. The prodrome can consist of yawning, fluid retention, pallor, nausea, light sensitivity, or mood changes, including sadness or irritability. Attempts to treat the prodrome and avoid the ensuing migraine have met with limited success; only a…

astronomy: Kepler: Kepler’s first book, Mysterium cosmographicum (“Cosmographic Mystery,” 1596), was based on this idea. As a result of this book, Kepler received an invitation to work with Tycho Brahe, but nothing happened until 1600, when Tycho left his native Denmark and relocated to Prague under the patronage of the…

Robert Brown: …partially published in 1810 in Prodromus Florae Novae Hollandiae et Insulae Van Diemen, a classic of systematic botany and his major work. Though the publication laid the foundations for Australian botany while refining the prevailing systems of plant classification, Brown was disappointed by its small sale and published only one…

Nicolaus Steno: …Naturaliter Contento Dissertationis Prodromus (The Prodromus of Nicolaus Steno’s Dissertation Concerning a Solid Body Enclosed by Process of Nature Within a Solid). In this work, a milestone in the literature of geology, he laid the foundations of the science of crystallography. He reported that, although quartz crystals differ greatly…

Theodore Prodromus was a Byzantine writer, well known for his prose and poetry, some of which is in the vernacular. He wrote many occasional pieces for a widespread circle of patrons at the imperial court. Some of the work attributed to him is unpublished and some of it may be wrongly attributed to

régisseur: …the American theatre and the producer in that of England. In ballet a régisseur coordinates the activities of the producer, stage technicians, and orchestra; handles the finances of the company; and makes all the arrangements for tours. In the cinema a régisseur’s duties—much like those of the assistant director in…

carbon cycle: …and terrestrial green plants (producers) are the chief agents of carbon dioxide fixation through the process of photosynthesis, through which carbon dioxide and water are converted into simple carbohydrates. These compounds are used by the producers to carry on metabolism, the excess being stored as fats and polysaccharides. The…

hip-hop: American hip-hop in the 21st century: …which hip-hop had become a producers’ medium. In the 21st century the music—born from the sonic creations of the deejay—saw some of its greatest innovations in the work of such studio wizards as Timbaland, Swizz Beatz, and the Neptunes. The focus on producers as both a creative and a commercial…

producer gas, mixture of flammable gases (principally carbon monoxide and hydrogen) and nonflammable gases (mainly nitrogen and carbon dioxide) made by the partial combustion of carbonaceous substances, usually coal, in an atmosphere of air and steam. Producer gas has lower heating value than other

producer goods, in economics, goods manufactured and used in further manufacturing, processing, or resale. Producer goods either become part of the final product or lose their distinct identity in the manufacturing stream. The prices of producer goods are not included in the summation of a

marketing: Limited-service wholesalers: Producers’ cooperatives—owned by their members, who are farmers—assemble farm produce to be sold in local markets and share profits at the end of the year.

statistics: Acceptance sampling: …this error is called the producer’s risk. On the other hand, the error of accepting a poor-quality lot creates a problem for the purchaser or consumer; the probability of this error is called the consumer’s risk.

B-film: …studios were collectively known as Poverty Row, Gower Gulch, or the B-Hive.

The Producers: …and helped inspire the hit Broadway musical version of the movie, which debuted in 2001 starring Nathan Lane and Matthew Broderick, both of whom starred in the film version of the stage musical in 2005.

The Producers, American screwball comedy–musical film, released in 1968, that is Mel Brooks’s first feature and his most acclaimed work. Zero Mostel played a failed theatrical producer, and Gene Wilder was cast as his timid accountant. Together they hatch a bizarre plot to make a fortune from

Susan Stroman: …directed a film version of The Producers in 2005. Stroman repeated her dual role as director and choreographer in Thou Shalt Not (2001–02), a musical version of Émile Zola’s Thérèse Raquin, as well as in The Frogs (2004), a musical adaptation of the play by Aristophanes; Young Frankenstein (2007), which…

hip-hop: American hip-hop in the 21st century: …which hip-hop had become a producers’ medium. In the 21st century the music—born from the sonic creations of the deejay—saw some of its greatest innovations in the work of such studio wizards as Timbaland, Swizz Beatz, and the Neptunes. The focus on producers as both a creative and a commercial…

régisseur: …the American theatre and the producer in that of England. In ballet a régisseur coordinates the activities of the producer, stage technicians, and orchestra; handles the finances of the company; and makes all the arrangements for tours. In the cinema a régisseur’s duties—much like those of the assistant director in…

marketing: Product: The first marketing-mix element is the product, which refers to the offering or group of offerings that will be made available to customers. In the case of a physical product, such as a car, a company will gather information about the features…

arithmetic: Addition and multiplication: …× 5 is called the product. The symbol × of this operation is read “times.” If such letters as a and b are used to denote the numbers, the product a × b is often written a∙b or simply ab.

production system: Underlying principles: All production systems, when viewed at the most abstract level, might be said to be “transformation processes”—processes that transform resources into useful goods and services. The transformation process typically uses common resources such as labour, capital (for machinery and equipment, materials, etc.), and space (land, buildings,…

product cipher, data encryption scheme in which the ciphertext produced by encrypting a plaintext document is subjected to further encryption. By combining two or more simple transposition ciphers or substitution ciphers, a more secure encryption may result. In the days of manual cryptography,

aerospace industry: Product development and testing: Initiation of the product development process differs between the military and commercial sectors. In the United States the defense services normally provide detailed mission specifications for desired products, against which contractors submit proposals as part of a competitive process. Proposals are…

monopoly and competition: Product differentiation: The structure of a market is also affected by the extent to which those who buy from it prefer some products to others. In some industries the products are regarded as identical by their buyers—as, for example, basic farm crops. In others the…

automotive industry: Diversity of products: The automotive industry’s immense resources in production facilities and technical and managerial skills have been devoted predominantly to the building of motor vehicles, but there has been a consistent and strong incentive to extend into related products and occasionally into operations whose…

liability insurance: Product liability and malpractice insurance present special problems because of the increasingly high cost of court awards of damages and because of the public’s high expectations of product safety and physician performance. An additional problem for product liability insurance is that the courts have tended…

computer science: Social and professional issues: …should be linked to a quality-control system that maintains a database of quality information and alerts the manager if quality is deteriorating and possibly even provides a diagnosis as to the source of any problems that arise. Automatically tracking the flow of products from station to station on the factory…

product rule, Rule for finding the derivative of a product of two functions. If both f and g are differentiable, then (fg)′ = fg′ +

set theory: Operations on sets: The Cartesian product of two sets A and B, denoted by A × B, is defined as the set consisting of all ordered pairs (a, b) for which a ∊ A and b ∊ B. For example, if A = {x, y} and B = {3,…

chemical industry: The complicated characteristics of the chemical industry: …changes, and some of the products of a modern refinery complex are chemicals by any definition. The term petrochemical is used to describe these chemical operations, but, because they are often carried out at the same plant as the primary distillation, the distinction between petroleum industry and chemical industry is…

production system: Underlying principles: All production systems, when viewed at the most abstract level, might be said to be “transformation processes”—processes that transform resources into useful goods and services. The transformation process typically uses common resources such as labour, capital (for machinery and equipment, materials, etc.), and space (land, buildings,…

fracking: Horizontal drilling: …yet another pipe called the production casing. In many operations more than one well can be drilled from a single surface site (or “pad”), or more than one lateral section can radiate from a single borehole.

biotechnology: History of biotechnology: … (often a human protein) into production cells—such as yeast, bacteria, or mammalian cells in culture—which then begin to produce the protein in volume. In the process of splicing a gene into a production cell, a new organism is created. At first, biotechnology investors and researchers were uncertain about whether the…

production chain, in economics, an analytical tool used to understand the nature of the production process (including production of both goods and services) and its transformations. The production process is a sequence of productive activities leading to an end use—a chain of linked functions, in

Dracula: …ending, in accordance with Hollywood’s Production Code, for a 1936 rerelease of the film; the original ending was subsequently lost. The commercial success of Dracula helped establish Universal Pictures as the premier studio for horror pictures, with Frankenstein following soon thereafter. In 1998 composer Philip Glass was commissioned to write…

production function, in economics, equation that expresses the relationship between the quantities of productive factors (such as labour and capital) used and the amount of product obtained. It states the amount of product that can be obtained from every combination of factors, assuming that the

assembly line, industrial arrangement of machines, equipment, and workers for continuous flow of workpieces in mass-production operations. (Read Henry Ford’s 1926 Britannica essay on mass production.) The design for an assembly line is determined by analyzing the steps necessary to manufacture each

production management, planning and control of industrial processes to ensure that they move smoothly at the required level. Techniques of production management are employed in service as well as in manufacturing industries. It is a responsibility similar in level and scope to other specialties

automation: Manufacturing applications of automation and robotics: Three types of automation in production can be distinguished: (1) fixed automation, (2) programmable automation, and (3) flexible automation.

mass production: A summary of mass production concepts: Similarly, a production line is usually designed to operate most efficiently at a specified rate. If the required production levels fall below that rate, operators and machines are being inefficiently used; and if the rate goes too high, operators must work overtime, machine maintenance cannot keep up,…

nuclear reactor: Production reactors: The very first nuclear reactors were built for the express purpose of manufacturing plutonium for nuclear weapons, and the euphemism of calling them production reactors has persisted to this day. At present, most of the material produced by such systems is tritium

artificial intelligence: Knowledge and inference: …of this type are called production rules. The inference engine enables the expert system to draw deductions from the rules in the KB. For example, if the KB contains the production rules “if x, then y” and “if y, then z,” the inference engine is able to deduce “if x,…

logistics: Production scheduling: Scheduling of production is done by others in the firm but with the assistance of the logistics staff. Production is scheduled in an attempt to balance demand for products with plant capacity and availability of inputs. Inbound materials and components must be scheduled…

production system, any of the methods used in industry to create goods and services from various resources. All production systems, when viewed at the most abstract level, might be said to be “transformation processes”—processes that transform resources into useful goods and services. The

theory of production, in economics, an effort to explain the principles by which a business firm decides how much of each commodity that it sells (its “outputs” or “products”) it will produce, and how much of each kind of labour, raw material, fixed capital good, etc., that it employs (its “inputs”

factors of production, term used by economists to denote the economic resources, both human and other, which, if properly utilized, will bring about a flow or output of goods and services. Simply stated, factors of production are the “inputs” necessary to obtain an “output.” However, not all the

theory of production, in economics, an effort to explain the principles by which a business firm decides how much of each commodity that it sells (its “outputs” or “products”) it will produce, and how much of each kind of labour, raw material, fixed capital good, etc., that it employs (its “inputs”

production management: Planning and control: This is called the “production-smoothing” problem. When more than one product is involved, complex industrial engineering or operations research procedures are required to analyze the many factors that impinge on the problem.

Maria Stewart: Activism: Productions of Mrs. Maria W. Stewart, a collection of her speeches, essays, and poems, was published in 1835.

Max Wertheimer: His Productive Thinking, which discussed many of his ideas, was published posthumously in 1945.

productivity, in economics, the ratio of what is produced to what is required to produce it. Usually this ratio is in the form of an average, expressing the total output of some category of goods divided by the total input of, say, labour or raw materials. In principle, any input can be used in the

estuary: Primary productivity: The high level of plant production in estuaries supports a correspondingly high level of production of invertebrate animals and fish. Estuaries often contain beds of shellfish such as mussels and oysters and large populations of shrimps and crabs. Fish such as plaice and flounders

rules of engagement: Peacetime rules of engagement (PROE) were also developed that differentiated hostile acts versus hostile intent and also emphasized that a response must be appropriate to the level of threat. Prior to the development of PROE, rules of engagement had only served to inform wartime actions;…

crustacean: Exoskeleton: …into four main stages: (1) Proecdysis, or premolt, is the period during which calcium is resorbed from the old exoskeleton into the blood. The epidermis separates from the old exoskeleton, new setae form, and a new exoskeleton is secreted. (2) Ecdysis, or the actual shedding of the old exoskeleton, takes…

Annemarie Moser-Pröll is an Austrian Alpine skier who held the all-time record of six women’s World Cup championships, five in succession (1971–75). Pröll skied from the age of four. She tried out for the Austrian national ski team at the age of 15. Her Olympic Winter Games success came late. She

plant development: Origin of the primary organs: …mass of tissue called the proembryo. No cotyledon, stem apex, or root apex is organized in this early period; these organs do not appear until after germination has occurred.

Iñigo López de Mendoza, marquis de Santillana: …to his collected works, the Proemio, the first example in Spanish of formal literary criticism, distinguishes three literary styles: high, for classical writing in Greek and Latin; middle, for formal works in the vernacular; and low, for ballads and songs without formal order.

zymogen, any of a group of proteins that display no catalytic activity but are transformed within an organism into enzymes, especially those that catalyze reactions involving the breakdown of proteins. Trypsinogen and chymotrypsinogen, zymogens secreted by the pancreas, are activated in the

Demeter: (3) Proerosia, at which prayers were offered for an abundant harvest, before the land was plowed for sowing. It was also called Proarktouria, an indication that it was held before the rising of Arcturus. The festival took place, probably sometime in September, at Eleusis. (4) Thalysia,…

Gilbert & George: …collaborative team made up of Gilbert Proesch (b. September 17, 1943, Dolomites, Italy) and George Passmore (b. January 8, 1942, Plymouth, Devon, England), whose dynamic and often humorous insertion of themselves into their art proved an important chapter in postwar British conceptual art.

dog: Reproductive cycle: The first stage is called proestrus. It begins with mild swelling of the vulva and a bloody discharge. This lasts for about 9 days, although it may vary by 2 or 3 days. During this phase the bitch may attract males, but she is not ready to be bred and…

Proetus, in Greek mythology, a king of Argos, grandson of Danaus. He quarreled with his twin brother, Acrisius, and divided the kingdom with him, Proetus taking Tiryns, which he fortified with huge blocks of stone carried by the Cyclopes. Proetus had three daughters with Stheneboea (called Anteia

Joseph Profaci was one of the most powerful bosses in U.S. organized crime from the 1940s to the early 1960s. Twice arrested and once imprisoned for a year in his native Sicily, he emigrated to the United States in 1921 and, thereafter, though arrested several times, managed always to avoid prison.

sacrilege, originally, the theft of something sacred; as early as the 1st century bc, however, the Latin term for sacrilege came to mean any injury, violation, or profanation of sacred things. Legal punishment for such acts was already sanctioned, in the Levitical code of ancient Israel. The

profanity, language that is considered socially offensive due to being vulgar, obscene, or irreverent. The term profanity is often used in a religious sense to refer to language that is blasphemous, sacrilegious, or sometimes merely secular. In a broader sense, profanity is often referred to as

golden cat: …of the family Felidae: the African golden cat (Profelis aurata), or the Asian golden cat (Catopuma temminckii), also known as Temminck’s cat.

Benjamín Jarnés: …was established by his second, El profesor inútil (1926; “The Useless Professor”), a series of episodes with little narrative action that point out a professor’s ineptitude and inability to tell reality from unreality. Similar motifs occur in El convidado de papel (1928; “The Paper Guest”), in which erotic pictures and…

Arthur Adamov: Le Professeur Taranne (performed 1953) was about a university professor unable to live up to his public role; though the play is dictated by the absurd logic of a dream, the construction and characterizations are firm and clear. In his best known play, Le Ping-pong…

classical scholarship: The rise of professionalism: Associated with Germany was the movement toward what may be called professionalism during the second half of the 19th century. Though Wolf’s example in founding a classical periodical in the vernacular had been followed elsewhere (e.g., the English Classical Journal, 1810–29), journals written primarily…

Waldenses: Early history: …this council Valdes made his Profession of Faith (which still survives); it is a statement of orthodox beliefs such as accused heretics were required to sign. Valdes, however, did not receive the ecclesiastical recognition that he sought. Undeterred, he and his followers (Pauperes, “Poor”) continued to preach; the archbishop of…

Jean-Jacques Rousseau: Years of seclusion and exile of Jean-Jacques Rousseau: …foi du vicaire savoyard (1765; The Profession of Faith of a Savoyard Vicar) Rousseau sets out what may fairly be regarded as his own religious views, since that book confirms what he says on the subject in his private correspondence. Rousseau could never entertain doubts about God’s existence or about…

teaching: Stereotype of the teacher: Writing in the Profession of Teaching in 1901, a Boston educator, James P. Monroe, said:

Ronald Reagan: First days: …of air traffic controllers, the Professional Air Traffic Controllers Organization (PATCO)—one of the few unions to endorse Reagan in the 1980 election—walked off their jobs, demanding higher pay and better working conditions. As federal employees, the PATCO members were forbidden by law to strike, and Reagan, on the advice of…

Don Carter: …and first president of the Professional Bowlers Association (PBA; founded in 1958). He began bowling as a boy while working as a pinsetter. He built his own lane in the basement of the family home, and in 1953 he joined the St. Louis Budweiser team. Carter was bowler of the…

chess: The world championship and FIDE: …of a new organization, the Professional Chess Association (PCA). Before Kasparov defeated Short in London in late 1993 in the first PCA championship, FIDE disqualified Kasparov and organized its own world championship match, won by Karpov.

privileged communication, in law, communication between persons who have a special duty of fidelity and secrecy toward each other. Communications between attorney and client are privileged and do not have to be disclosed to the court. However, in the wake of terrorist attacks against the United

Stanley Fish: …a Good Thing, Too (1994), Professional Correctness: Literary Studies and Political Change (1995), The Trouble with Principle (1999), and How Milton Works (2001). How to Write a Sentence: And How to Read One and Winning Arguments: What Works and Doesn’t Work in Politics, the Bedroom, the Courtroom, and the Classroom…

cramp: Professional or occupational cramp is a functional spasm affecting certain muscles that are used constantly in a daily occupation. At first there is a gradually increasing difficulty, or clumsiness, in making the movements required for the work at hand. Writers, for example, cannot move the pen or…

library: Training institutes: …the education and training of professionals have come from librarians or their professional associations. In the United States the first university school for librarians was established in 1887 by Melvil Dewey at Columbia University. The American Library Association (ALA) pursued a policy of accreditation in an effort to ensure that…

fraternity and sorority: The membership of professional fraternities is limited to students and faculty members engaged in a particular field of specialization. Membership qualifications are broader than for the social groups and emphasize activities designed to develop professional competency rather than social life. The first professional fraternity, Kappa Lambda, was founded…

golf: British tournaments and players: …for the formation of the Professional Golfers Association in 1901. This body is responsible for professional tournaments in Great Britain and for the biennial Ryder Cup match (for professionals) when it is played there.

Professional Golfers’ Association of America (PGA of America), organization formed in the United States in 1916 at the instigation of Rodman Wanamaker, a Philadelphia businessman, with the stated purpose of promoting interest in professional golf, elevating the standards of the game, and advancing

insurance: Professional liability insurance: Known as malpractice, or errors-and-omissions, insurance, professional liability contracts are distinguished from general business liability policies because of the specialized nature of the liability. Professional persons requiring liability contracts include physicians and surgeons, lawyers, accountants, engineers, and insurance agents. Important differences between…

networking, the development, maintenance, or use of social or professional contacts for the purpose of exchanging information, resources, or services. A professional network can be thought of as a web or series of interconnected webs—whereby links or ties exist between focal individuals and the

teaching: Educational associations and teachers’ unions: Professional groups all over the world have organized for collective action to do two quite different things. One objective of a professional organization is to improve the economic status and the working conditions of its members. A second broad objective is to improve the service…

Dai Jin: …was later placed within the lineage of “professional” painters and held in lesser regard in contrast to the school of literary “amateurs,” who were more concerned with personal expression and who were then represented in the Wu school in which Shen Zhou held an equivalent place of leadership.

rodeo: Origins and history: …(RCA) in 1945 and the Professional Rodeo Cowboys Association (PRCA) in 1975, and its rules became accepted by most rodeos.

There are four professional team-sports leagues that are the most prestigious in North America: Major League Baseball (MLB), the National Basketball Association (NBA), the National Football League (NFL), and the National Hockey League (NHL). These leagues feature the highest level of competition in

information system: Professional support systems: Professional support systems offer the facilities needed to perform tasks specific to a given profession. For example, automotive engineers use computer-aided engineering (CAE) software together with virtual reality systems to design and test new models as electronic prototypes for fuel efficiency, handling,…

Vince McMahon: ) is an American professional wrestling impresario who used showmanship and tireless promotion to make wrestling, formerly a niche entertainment, into a vastly lucrative industry.

Natalie Portman: Early life and first films: …film role in Léon (1994; The Professional). She starred opposite French actor Jean Reno as an adolescent girl training to be an assassin after her parents have been murdered. Hershlag assumed her maternal grandmother’s last name at this time in order to protect herself from unwanted attention as a result…

professionalism, the standards, practices, or motivations associated with a profession. The concepts of professionalism, profession, and professionalization have received considerable and sometimes critical attention in sociology. In early British and American analyses, professionalism was

professionalism: …as a successful ideology and professionalization as a process of dominance over an occupation or a market. Professionalization, according to that interpretation, was intended to promote professionals’ own occupational self-interest with respect to salary, status, and power, as well as monopoly protection of an occupational jurisdiction. Professionalization was a process…

The Professionals, American western film, released in 1966, that was an action-packed, testosterone-driven adventure featuring an all-star cast. Four fortune hunters are hired by rich land baron Joe Grant (played by Ralph Bellamy) to ride into Mexico and rescue his young wife, Maria (Claudia

John Boorman: Later career and honors: Boorman also cowrote the drama The Professor and the Madman (2019).