All articles starting with P
28,818 articles
Peptide-N(4)-(N-acetyl-beta-D-glucosaminyl)asparagine amidase F
PNGase F (peptide-N4-(N-acetyl-beta-D-glucosaminyl)asparagine amidase F, EC 3.5.1.52) is a bacterial amidase from Elizabethkingia miricola that releases nearly all N-linked glycans from glycoproteins, except core alpha1-3-fucosylated ones.
Peptidergic neuron
Peptidergic neuron (Cell Ontology CL:0000110): a neuron using neuropeptides as transmitters, stored in large dense-core vesicles, acting on GPCRs, usually co-released with classical transmitters.
Peptidoglycan
Peptidoglycan (murein): the bacterial cell wall polymer of MurNAc-GlcNAc glycan strands cross-linked by peptide stems, forming a turgor-resisting sacculus; Gram-positive walls are 20-100 nm thick, Gram-negative 1-10 nm; target of β-lactams and vancomycin.
Peptidoglycan recognition protein
Peptidoglycan recognition proteins (PGRPs, mammalian PGLYRP1-4) are innate immune proteins, conserved from insects to mammals, that bind bacterial peptidoglycan, activate Toll and Imd pathways, degrade peptidoglycan, or kill bacteria directly.
Peptidoglycan recognition protein family domain, metazoa/bacteria
InterPro IPR006619 (SMART SM00701), a conserved ~165-amino-acid peptidoglycan-binding domain in animal peptidoglycan recognition proteins and some bacteria, homologous to bacteriophage T7 lysozyme type 2 amidases.
Peptidoglycan recognition protein, PGRP-S
PGRP-S (PGLYRP1, Tag7) is a short mammalian peptidoglycan-recognition protein of neutrophil granules that binds Lys- and DAP-type peptidoglycan, inhibits S aureus and E coli growth, synergizes with lysozyme in NETs, and also acts as a tumor-cell-killing and lymphocyte-attracting factor.
PeptiDream
PeptiDream Inc. is a Tokyo-based biopharmaceutical company, founded in 2006 by Kiichi Kubota and Hiroaki Suga, that discovers macrocyclic peptide drug candidates through its proprietary PDPS platform.
Peptidyl-prolyl cis-trans isomerase, PpiC-type
PpiC-type peptidyl-prolyl cis-trans isomerases: E. coli cytoplasmic parvulin Par10 (10.1 kDa, juglone-sensitive) and E. faecium PrsA-family membrane foldase, a dimeric 2.5 Å-structure vaccine antigen against gram-positive pathogens.
Peptidyl-tRNA hydrolase, PTH2
Peptidyl-tRNA hydrolase, PTH2, is one of two structurally distinct enzyme classes that release tRNA from peptidyl-tRNA, clearing stalled translation products and conserving the tRNA pool; it is found across archaea, bacteria, and eukaryotes.
Peptoid nanosheet
A peptoid nanosheet is a free-floating, two-dimensional crystalline membrane self-assembled from synthetic peptoid polymers, discovered at Lawrence Berkeley National Laboratory in 2010 and studied for biosensing and drug delivery.
Peptoids
Peptoids are synthetic peptidomimetics, oligomers of N-substituted glycine whose side chains attach to the backbone nitrogen; they were developed at Chiron Corporation in the early 1990s.
Peptostreptococcus
Peptostreptococcus, a genus of gram-positive anaerobic cocci in human normal flora; type species P. anaerobius. Once a broad clinical grouping, now reduced to three species after reclassification into Finegoldia, Parvimonas, Peptoniphilus, and Anaerococcus.
Pepy-ankh the Black
Pepy-ankh the Black (Pepy-ankh Heny-kem) was a provincial ruler of Cusae in Middle Egypt during the late Sixth Dynasty, buried in the largest decorated tomb at Meir.
Pepyankh the Middle
Pepyankh the Middle was an Old Kingdom Egyptian official who served as vizier and overseer of Upper Egypt under Pepy II, buried in a large rock-cut tomb at Meir.
Pequod (Moby-Dick)
Pequod: the fictional Nantucket whaleship in Melville's Moby-Dick (1851), commanded by Captain Ahab, sunk by the White Whale, sourced from the 1821 Essex shipwreck.
Pequot War
The Pequot War (1636–1638) was a conflict between the Pequot people and English colonists of Massachusetts Bay, Plymouth, and Saybrook with Mohegan and Narragansett allies, driven by struggles over the fur and wampum trade and ending with the Treaty of Hartford, which dispersed the Pequot and banned their name.
Per a 2
Per a 2 is a 42 kDa aspartic protease-like major allergen of the American cockroach Periplaneta americana, homologous to Bla g 2, with IgE epitopes mapped and links to asthma severity.
Per a 3
Per a 3 is the 72 kDa arylphorin/hemocyanin-homolog allergen of the American cockroach Periplaneta americana (obsolete name Cr-PI), a hexameric airway allergen with four isoallergens and 26–95% reported IgE prevalence.
Per a 4
Per a 4 is a 21 kDa lipocalin allergen of the American cockroach Periplaneta americana that transports male pheromone; a minor human allergen, it is the most IgE-recognized cockroach component in pet dogs (69% versus 18% in owners).
Per a 5
Per a 5 (Per a 5.0101) is the delta-class glutathione S-transferase allergen of the American cockroach Periplaneta americana, a 23 kDa IgE-binding protein important in tropical Asian cockroach allergy, distinct from the sigma-class Bla g 5.
Per A. Peterson
Per A. Peterson, also known as Per Artur Peterson, is a Swedish-born immunologist known for MHC research who chaired immunology at Scripps before leading Johnson & Johnson pharmaceutical R&D.
Per Ahlberg
Per Erik Ahlberg is a Swedish vertebrate paleontologist and professor at Uppsala University known for discovering the earliest tetrapod body fossils and oldest tetrapod footprints.
Per Andersen
Per Andersen (1930–2020) was a Norwegian neuroscientist at the University of Oslo whose lab identified inhibitory neurons, developed the hippocampal slice, and discovered long-term potentiation.
Per Aspera Ad Astra (星河入梦) (2026 film)
Per Aspera Ad Astra (星河入梦) is a 2026 Chinese sci-fi adventure film directed by Han Yan, starring Wang Hedi and Song Qian, released 17 February 2026; final box office 101 million yuan, Douban 6.9.
Per Bak
Per Bak (1947–2002) was a Danish theoretical physicist who proposed self-organized criticality with Chao Tang and Kurt Wiesenfeld at Brookhaven in 1987, later professor at the Niels Bohr Institute.
Per Björntorp
Per Björntorp (1931–2003) was a Swedish physician-scientist at Sahlgrenska University Hospital in Gothenburg who researched obesity and is described as one of the fathers of the metabolic syndrome concept.
Per curiam decision
Per curiam decision (Latin "by the court"): an unsigned court opinion issued in the court's name without naming a judge-author; typical of short summary dispositions but used even in landmark cases like Bush v. Gore.
Per diem
Per diem is a daily allowance an employer or government agency pays travelers for lodging and meals and incidental expenses, often without receipts; the term also describes day-rate pay for temporary workers.
Per E. M. Siegbahn
Per E. M. Siegbahn, born 1945 in Stockholm, is a Swedish theoretical chemist at Stockholm University who introduced the CASSCF method and models metalloenzyme mechanisms, including nitrogenase.
Per Erik Hedlund
Per Erik Hedlund, nicknamed "Särna", was a Swedish cross-country skier who won the 50 km gold at the 1928 St. Moritz Olympics by a record margin and twice won Vasaloppet.