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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.
Titanium is a chemical element; it has symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in sea water, aqua regia, and chlorine .
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.
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Population and Community Development Association, Thailand. Private defense agency, an enterprise which would provide personal protection and military defense services to individuals. Professional Driver Association, of NASCAR drivers before the 1969 Talladega 500. Public development authority, government-owned corporations in Washington, US.
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