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Puerto Rico (Spanish for 'rich port'; abbreviated PR; Taino: Borikén or Borinquen), officially the Commonwealth of Puerto Rico (Spanish: Estado Libre Asociado de Puerto Rico, lit. 'Free Associated State of Puerto Rico'), is a Caribbean island, Commonwealth, and unincorporated territory of the United States.
The Prandtl number ( Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity. [1] The Prandtl number is given as: where: ν {\displaystyle u } : momentum diffusivity ( kinematic viscosity ),
Proportional representation ( PR) refers to any type of electoral system under which subgroups of an electorate are reflected proportionately in the elected body. [1] The concept applies mainly to political divisions ( political parties) among voters.
PR interval. In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200 ms in duration. The PR interval is sometimes termed ...
Pathogenesis-related (PR) proteins are proteins produced in plants in the event of a pathogen attack. [1] They are induced as part of systemic acquired resistance. Infections activate genes that produce PR proteins. Some of these proteins are antimicrobial, attacking molecules in the cell wall of a bacterium or fungus.
Public relations ( PR) is the practice of managing and disseminating information from an individual or an organization (such as a business, government agency, or a nonprofit organization) to the public in order to influence their perception. Public relations and publicity differ in that PR is controlled internally, whereas publicity is not ...
Fujifilm X-Pro2. The Fujifilm X-Pro1 is a mirrorless interchangeable-lens digital camera announced in January 2012 [2] and launched in March 2012. It is part of Fujifilm's X-Series of cameras. In October 2012 Fujifilm released a very similar, yet smaller, camera named the X-E1. In January 2016 Fujifilm announced its successor, the X-Pro2 .
This element also has 15 meta states with the most stable being 138m Pr (t 1/2 2.12 hours), 142m Pr (t 1/2 14.6 minutes) and 134m Pr (t 1/2 11 minutes). The isotopes of praseodymium range in atomic weight from 120.955 u ( 121 Pr) to 158.955 u ( 159 Pr). The primary decay mode before the stable isotope, 141 Pr, is electron capture and the mode ...