All articles starting with P
28,818 articles
Pseudomonas virus phi6 (Φ6)
Pseudomonas virus phi6 (Φ6), a Cystoviridae bacteriophage of Pseudomonas syringae, is the first known phage with a lipid envelope and tri-segmented dsRNA genome; a model virus and enveloped-virus surrogate.
Pseudomonotis
Pseudomonotis, extinct pectinoid bivalve genus named by Beyrich in 1862, Pennsylvanian-Permian marine fossil with inequivalve shells; type species disputed, Mesozoic records reassigned to Monotis.
Pseudomorphic HEMT
A pseudomorphic HEMT (pHEMT) is a compound semiconductor field-effect transistor with a thin, strained InGaAs channel, giving high gain and low noise for RF and microwave use.
Pseudomurein endoisopeptidase, C-terminal domain
The pseudomurein endoisopeptidase C-terminal domain is the catalytic cysteine protease domain defining peptidase family C71, found in PeiW and PeiP, which cleaves pseudomurein cell walls of methanogenic archaea.
Pseudomyogenic hemangioendothelioma
Pseudomyogenic hemangioendothelioma (epithelioid sarcoma-like hemangioendothelioma) is a rare intermediate vascular tumor of skin, soft tissue, and bone in young men, multifocal, locally recurrent, rarely metastatic, defined by FOSB gene fusions.
Pseudomyotonia
Pseudomyotonia (ICD-11 8C71.5), also called false myotonia, is delayed muscle relaxation mimicking myotonia without myotonic discharges on EMG; causes include Isaacs syndrome, Hoffmann's hypothyroid myopathy, Brody disease, and central lesions.
Pseudomys
Pseudomys (Gray, 1832) is a genus of Australian native mice in the old endemic rodent radiation, part of the Pseudomys division with Zyzomys, Leggadina, Mastacomys, and Notomys; arid-adapted seed and grass eaters including several threatened species.
Pseudomyxoma peritonei
Pseudomyxoma peritonei (PMP), or jelly belly, a rare mucin-filling peritoneal cancer usually from a ruptured appendiceal mucinous neoplasm; treated with cytoreductive surgery plus HIPEC, 1-2 per million incidence.
Pseudonaja
Pseudonaja, brown snakes, is a genus of nine highly venomous Australian elapid snake species including the eastern brown snake (P. textilis), Australia's leading cause of snakebite deaths, with prothrombin-activator venom causing rapid coagulopathy.
Pseudonym
Pseudonym: a fictitious name, especially an author's pen name (Mark Twain, Lewis Carroll, George Eliot); from Greek pseudonymos, first used in English in 1817; covers copyright, research-ethics, and online identity uses distinct from anonymity.
Pseudonymization
Pseudonymization is a data protection technique defined in Article 4(5) of the GDPR in which personal data is processed so it cannot be attributed to a person without separately protected additional information.
Pseudoperonospora cubensis
Pseudoperonospora cubensis, the cucurbit downy mildew pathogen, is an oomycete infecting over 60 Cucurbitaceae species; heterothallic, polycyclic, wind-dispersed, with widespread fungicide resistance and a 2004 US resurgence.
Pseudophyllodromiidae
Pseudophyllodromiidae (Hebard, 1929), also cited as Pseudophyllodromiidae Grandcolas, 1996, is a family of small blaberoid cockroaches with about 1,042 valid extant species, poorly defined monophyly, and diagnosis resting on male genitalia.
Pseudoplatystoma corruscans
Pseudoplatystoma corruscans, the spotted sorubim or pintado, is a large migratory South American pimelodid catfish of the São Francisco and Paraná basins, reaching 182 cm and 100 kg, spotted, overfished, and farmed.
Pseudoplatystoma fasciatum
Pseudoplatystoma fasciatum, the barred sorubim or tiger shovelnose catfish (doncella), is a large striped pimelodid catfish of the Amazon, Orinoco, Paraná, and other South American basins, reaching 105 cm and 70 kg, fished commercially and listed Least Concern but decreasing.
Pseudopleuronectes americanus
Pseudopleuronectes americanus, the winter flounder (also blackback, lemon sole, plie rouge), is a right-eyed Pleuronectidae flatfish from the Gulf of St. Lawrence to North Carolina that spawns inshore in winter; IUCN Vulnerable, three U.S. managed stocks.
Pseudopoda
Pseudopoda (Jäger, 2000) is the most species-rich huntsman spider genus in Sparassidae, with 270 species from East, South, and Southeast Asia; type species P. prompta, centered in China, leaf-litter habitats, 17–3,847 m elevation.
Pseudopodia
Pseudopodia (pseudopods, "false feet") are temporary actin-rich cell-surface extensions used by amoebae, neutrophils, and other eukaryotic cells for locomotion and food capture, driven by actin polymerization and organized by chemotactic signaling.
Pseudopolygnathus
Pseudopolygnathus (Branson & Mehl, 1934), type species P. prima, is an extinct conodont genus of Late Devonian to Carboniferous marine chordates, distinguished from Polygnathus by a large flared basal cavity and used in Famennian and Tournaisian biostratigraphy.
Pseudoporphyria
Pseudoporphyria, also called pseudoporphyria cutanea tarda, is a drug- or UV-triggered blistering photosensitive skin disorder mimicking porphyria cutanea tarda but with normal porphyrin tests; naproxen and dialysis are leading causes.
Pseudopotential
A pseudopotential is an effective, usually nonlocal potential that replaces an atom's nucleus and inert core electrons in electronic-structure calculations, underpinning plane-wave density-functional theory methods for solids.
Pseudopseudohypoparathyroidism
Pseudopseudohypoparathyroidism (PPHP, pseudo-PHP), also iPPSD2, a rare genetic disorder with Albright hereditary osteodystrophy features but no PTH resistance, caused by paternally inherited GNAS mutations; maternal inheritance of the same mutation causes PHP-Ia.
Pseudorandom generator
A pseudorandom generator is a deterministic algorithm that stretches a short random seed into a longer output that appears random to any observer who lacks the seed.
Pseudorandom number generator
A pseudorandom number generator (PRNG) is a deterministic algorithm that produces number sequences resembling randomness from a short seed, though outputs remain fully predictable if the seed is known.
Pseudorandom quantum states
Pseudorandom quantum states, or PRSs, are keyed quantum states generated efficiently by a quantum computer yet indistinguishable from Haar-random states by any efficient quantum adversary.
Pseudorandomness
Pseudorandomness is the property of a deterministic process whose output appears random when its internal workings are hidden; cryptographic pseudorandomness means computationally indistinguishable from truly random output.
Pseudoroegneria spicata
Pseudoroegneria spicata, bluebunch wheatgrass (beardless wheatgrass in subsp. inerme), is a native cool-season perennial bunchgrass of western North American sagebrush steppe, a leading rangeland restoration grass with cultivars Whitmar, Goldar, P-7, and Anatone.
Pseudoscalar
A pseudoscalar in geometric algebra (Clifford algebra) is the product of all orthonormal basis vectors, representing a unit oriented volume and fixing the space's orientation.
Pseudoscience
Pseudoscience is a non-scientific doctrine or practice whose major proponents present it as scientific. Deciding which claims qualify is the demarcation problem, debated since antiquity and still unresolved.
Pseudoscorpion
Pseudoscorpion (Pseudoscorpiones, false or book scorpion): a tiny harmless arachnid with scorpion-like pincers but no tail or sting; about 3,000 species, Devonian fossils, venom glands in pincers, phoresy dispersal.