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Polydiacetylenes. General chemical structure of a polydiacetylene. Polydiacetylenes ( PDAs) are a family of conducting polymers closely related to polyacetylene. They are created by the 1,4 topochemical polymerization of diacetylenes. They have multiple applications from the development of organic films to immobilization of other molecules.
Patent ductus arteriosus ( PDA) is a medical condition in which the ductus arteriosus fails to close after birth: this allows a portion of oxygenated blood from the left heart to flow back to the lungs through the aorta, which has a higher blood pressure, to the pulmonary artery, which has a lower blood pressure.
Pushdown automaton. In the theory of computation, a branch of theoretical computer science, a pushdown automaton ( PDA) is a type of automaton that employs a stack . Pushdown automata are used in theories about what can be computed by machines. They are more capable than finite-state machines but less capable than Turing machines (see below ).
Young v. United Parcel Service, 575 U.S. 206 (2015) The Pregnancy Discrimination Act ( PDA) of 1978 ( Pub. L. 95–555) is a United States federal statute. It amended Title VII of the Civil Rights Act of 1964 to "prohibit sex discrimination on the basis of pregnancy." [1] [2] The Act covers discrimination "on the basis of pregnancy, childbirth ...
USS. Archerfish. (SSN-678) USS Archerfish (SSN-678), a Sturgeon -class attack submarine, was the second ship of the United States Navy to be named for the archerfish, a family ( Toxotidae) of fish notable for their habit of preying on insects and other animals by shooting them down with squirts of water from the mouth.
Danish. Calamity, a Childhood of Martha Jane Cannary ( French: Calamity, une enfance de Martha Jane Cannary) is a 2020 French-Danish animated family feature film directed by Rémi Chayé. The film is loosely based on the life of the American frontierswoman Calamity Jane .
The Palm TX. A personal digital assistant ( PDA) is a multi-purpose mobile device which functions as a personal information manager. PDAs have been mostly displaced by the widespread adoption of highly capable smartphones, in particular those based on iOS and Android, and thus saw a rapid decline in use after 2007.
Pathological demand avoidance. Pathological demand avoidance ( PDA) or extreme demand avoidance ( EDA) is a proposed disorder, and sub-type of autism spectrum disorder, defined by characteristics such as a demand avoidance—which is a greater-than-typical refusal to comply with requests or expectations—and extreme efforts to avoid social ...