42,772 articles
Palmer Drought Severity Index
The Palmer Drought Severity Index (PDSI) is a standardized drought index developed by Wayne Palmer in 1965 that uses temperature and precipitation data to estimate relative dryness.
Palmer Station
Palmer Station is a U.S. year-round Antarctic research station on Anvers Island, off the Antarctic Peninsula, operated by the National Science Foundation and commissioned in 1968.
Palmitic acid
Palmitic acid (hexadecanoic acid) is a long-chain saturated fatty acid, C16H32O2, the most common saturated fatty acid in the human body and the main one in palm oil.
Palmitoleic acid concentrate
Palmitoleic acid concentrate: purified fish-oil fatty acid ethyl esters standardized to about 50% palmitoleic acid (omega-7, 16:1 n-7), GRAS under FDA GRN 494 (Tersus, 2014) and covered by TGA compositional guidelines for listed medicines.
Palomar 12
Palomar 12, also cataloged as the Capricornus Dwarf, is a young, metal-rich globular cluster in Capricornus that the Milky Way captured from the Sagittarius dwarf galaxy.
Palomar 5
Palomar 5 (Pal 5) is a sparse globular cluster of the Milky Way halo, about 75,000 light years away, being torn apart by tides into two long tails of stars.
Palomar Observatory
Palomar Observatory is a Caltech-operated astronomical observatory on Palomar Mountain in southern California, home to the 200-inch Hale Telescope, the world's largest telescope from 1948 to 1993.
Palomar Observatory Sky Survey
The Palomar Observatory Sky Survey (POSS) is a photographic survey of the northern sky made with the 48-inch Oschin Schmidt telescope at Palomar Observatory, begun in 1949 and completed in 1958.
Palomar Transient Factory
The Palomar Transient Factory (PTF) was an automated optical sky survey at Caltech's Palomar Observatory, running from 2009 until 2017, that found supernovae and other transient sources.
Palsa
A palsa, from the Lappish and Finnish word for a bog hummock, is a peat-covered permafrost mound with an ice core, rising above mires in subarctic regions of the Northern Hemisphere.
Palygorskite
Palygorskite, also known as attapulgite, is a fibrous magnesium aluminum phyllosilicate clay mineral valued as a salt-tolerant thickener, absorbent, and suspending agent in drilling fluids and cat litter.
Palynostratigraphy
Palynostratigraphy is the branch of biostratigraphy that dates and correlates sedimentary rocks using fossil pollen, spores, and other organic-walled microfossils, especially where marine index fossils are absent.
Palytoxin
Palytoxin is a highly poisonous marine toxin isolated in 1971 from the Hawaiian coral Palythoa toxica, which kills cells by converting the sodium-potassium pump into a channel.
PAM-alginate tough hydrogel
The PAM-alginate tough hydrogel is a double-network hydrogel of polyacrylamide and alginate reported at Harvard in 2012 that contains about 90% water yet stretches beyond 20 times its length.
PAMAM dendrimer
A PAMAM dendrimer (polyamidoamine) is a highly branched synthetic polymer first made by Donald Tomalia at Dow Chemical in 1979 and widely studied for drug and gene delivery.
PAMELA (detector)
PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) was a cosmic-ray detector launched in 2006, known for measuring a rising positron fraction in cosmic rays.
Pamela A. Matson
Pamela A. Matson is an American sustainability scientist and Stanford professor known for work on biosphere-atmosphere interactions, elected to the National Academy of Sciences in 1994.
Pamela L. Heinselman
Pamela L. Heinselman is an American research meteorologist at NOAA's National Severe Storms Laboratory in Norman, Oklahoma, known for phased-array radar research and the Warn-on-Forecast program.
Pamela L. Nagler
Pamela L. Nagler is an American USGS scientist in Tucson, Arizona, known for satellite measurement of riparian water use and a 2009 Presidential Early Career Award.
Pamela M. Chu
Pamela M. Chu is an American analytical chemist at NIST in Gaithersburg, Maryland, known for quantitative infrared spectroscopy, trace-gas reference data, and coordinating NIST's carbon capture program since 2021.
Pan (moon)
Pan (Saturn XVIII, S/1981 S13) is a small moon of Saturn that keeps the A ring's Encke Gap open, discovered by Mark Showalter in 1990.
Pan American Silver
Pan American Silver is a Canadian precious metals mining company headquartered in Vancouver, founded by Ross Beaty in 1994, producing silver and gold from mines across the Americas.
Pan-African orogeny
The Pan-African orogeny was a protracted series of tectonic, metamorphic, and magmatic events between about 725 and 500 million years ago, forming mobile belts during the assembly of Gondwana.
Pan-STARRS
Pan-STARRS, the Panoramic Survey Telescope and Rapid Response System, is a pair of University of Hawaii survey telescopes on Haleakalā, Maui, known for asteroid searches and discovering ʻOumuamua, the first known interstellar object, in 2017.
Pan-STARRS1 Medium Deep Survey
The Pan-STARRS1 Medium Deep Survey repeatedly imaged ten small sky fields with the 1.8-meter Pan-STARRS1 telescope on Haleakala, Hawaii, between 2009 and 2014, discovering over 5,000 supernova-like transients.
Panagiotis Karkanas
Panagiotis (Takis) Karkanas is a Greek geoarchaeologist known for sediment micromorphology; since 2014 he has directed the Wiener Laboratory for Archaeological Science at Athens, and was elected to the National Academy of Sciences in 2018.
Panče Naumov
Panče Naumov (Панче Наумов) is a Macedonian-born chemist, professor at New York University Abu Dhabi, known for establishing crystal adaptronics, the study of molecular crystals that bend, jump, and heal.
Pancharatnam–Berry phase
The Pancharatnam–Berry phase is a geometric phase acquired by light whose polarization evolves, equal to half the enclosed solid angle on the Poincaré sphere; Pancharatnam found it in 1956 and Berry generalized it in 1984.
PANDA experiment
PANDA (antiProton ANnihilations at Darmstadt) is a key particle physics experiment under construction at FAIR in Darmstadt, Germany, using antiproton annihilation to study hadrons and the strong interaction.
Pandas (software)
Pandas, also known as Python Pandas, is an open-source Python library for data analysis whose Series and DataFrame structures are built on NumPy; development began in 2008.