All articles starting with N
16,460 articles
Nonresponse bias
Nonresponse bias is the error in a survey estimate when respondents differ systematically from nonrespondents on the measured quantity; unlike sampling error, it does not shrink as the sample grows.
Nonrheumatic aortic valve stenosis
Nonrheumatic aortic valve stenosis (ICD-11 BB70.1, ICD-10 I35.0) is aortic valve narrowing from non-rheumatic causes, chiefly calcific degeneration and bicuspid valve, the most common valvular heart disease in adults over 65, treated by SAVR or TAVR.
Nonribosomal peptide
Nonribosomal peptides (NRPs) are peptide natural products made by modular NRPS megasynthetases, not ribosomes, yielding drugs like penicillin, vancomycin, and cyclosporine; typically under 10 amino acids with D- and noncanonical residues.
Nonsan Sunshine Land
Nonsan Sunshine Land (선샤인랜드) is a cultural complex in Nonsan, South Korea, built around the set of the drama Mr. Sunshine, with military experience facilities and a 1950s street.
Nonsectarian
Nonsectarian means not affiliated with any religious sect or denomination. In US higher education it denotes colleges with no religious test or denominational control, from the University of Virginia (1819) onward; the term is now largely replaced by "secular".
Nonsense verse
Nonsense verse is whimsical light verse, usually for children, using made-up words, strict rhyme, and rhythm over meaning. Founded modernly by Edward Lear (Book of Nonsense, 1846) and Lewis Carroll, with roots in nursery rhymes and older traditions.
Nonsense-mediated decay
Nonsense-mediated decay (NMD), or nonsense-mediated mRNA decay, is a conserved eukaryotic RNA surveillance pathway that degrades mRNAs with premature termination codons via UPF1, SMG proteins, and exon-junction complexes, also regulating normal gene expression.
Nonsmooth contact dynamics
Nonsmooth contact dynamics is the branch of mechanics that models velocity jumps, set-valued forces, and discontinuities from impacts and Coulomb friction, applied to granular materials, masonry, and robotics.
Nonso Amadi
Nonso Amadi is a Canada-based Nigerian singer, songwriter, and producer blending alté, afro-fusion, and R&B, who broke out with "Tonight" and released When It Blooms in 2023.
Nonso Anozie
Nonso Anozie, also known as Nonso Anozie the British-Nigerian actor, is a London-born stage and screen performer of Igbo descent, the youngest professional King Lear (2002), Ian Charleson Award winner for Othello, and star of Game of Thrones, Zoo, Sweet Tooth, Cinderella, and Artemis Fowl.
Nonsolvent-induced phase separation
Nonsolvent-induced phase separation, also known as NIPS or wet-phase inversion, is a membrane fabrication process in which solvent-nonsolvent exchange demixes a cast polymer solution into a porous membrane.
Nonspecific intraventricular conduction delay
Nonspecific intraventricular conduction delay (NICD, NSIVCD): an ECG finding of prolonged QRS (over 110 ms in adults) without LBBB or RBBB criteria; causes, prognosis, and CRT implications.
Nonspecific low blood-pressure reading
Nonspecific low blood-pressure reading is a clinical finding of a blood pressure of 90/60 mmHg or lower without a diagnosis of hypotension, coded R03.1 in ICD-10-CM.
Nonspecific mesenteric lymphadenitis
Nonspecific mesenteric lymphadenitis, also called primary mesenteric adenitis, is a self-limiting inflammation of the abdominal lymph nodes draining the intestine that mainly affects children and mimics appendicitis.
Nonstandard analysis
Nonstandard analysis is a rigorous formulation of mathematical analysis using actual infinitesimal and infinitely large numbers instead of epsilon-delta limits, introduced by Abraham Robinson at Princeton in 1960.
Nonsteroidal anti-inflammatory drug
Nonsteroidal anti-inflammatory drugs (NSAIDs), including aspirin, ibuprofen, naproxen, diclofenac, and celecoxib, relieve pain, inflammation, and fever by inhibiting COX-1 and COX-2 enzymes; key risks are gastrointestinal bleeding, kidney injury, and cardiovascular events.
NonStop (server computers)
NonStop, also known as Integrity NonStop, is a family of fault-tolerant server computers created by Tandem Computers in 1976 and now sold by Hewlett Packard Enterprise.
Nonstress test
Nonstress test (NST), a third-trimester antenatal fetal surveillance test recording fetal heart rate for 20+ minutes; reactive if two or more accelerations occur, with ~99.5-99.8% negative predictive value but ~50% false-positive nonreactive rate.
Nonsuch Palace
Nonsuch Palace, a Tudor royal palace built by Henry VIII from 1538 in Surrey on the cleared village of Cuddington, famed for Renaissance stucco panels, unfinished at his death, and demolished in the 1680s.
Nonsurgical periodontal therapy
Nonsurgical periodontal therapy (NSPT) treats periodontitis by removing plaque and calculus above and below the gumline, mainly through scaling and root planing, without cutting gum tissue.
Nonsynaptic plasticity
Nonsynaptic plasticity: activity- or learning-induced changes in neuronal intrinsic excitability, ion channels, myelin, and homeostatic or metaplastic mechanisms, rather than synaptic strength; includes intrinsic plasticity, slow AHP reductions, and transient excitability-based memory traces.
NONT TANON
Nont Tanont (นนท์ ธนนท์), full name Tanont Chumroen, is a Thai pop-soul and R&B singer from Phuket who won The Voice Thailand's first season in 2012 at age 16.
Nontarget screening
Nontarget screening is an analytical chemistry method that uses high-resolution mass spectrometry to detect and identify chemical compounds in a sample without preselecting which analytes to look for.
Nontargeted analysis
Nontargeted analysis, also called untargeted screening, is an analytical chemistry method that uses high-resolution mass spectrometry to detect unknown chemicals without a predefined target list.
Nonthaburi
Nonthaburi (นนทบุรี) is a central Thai province on the Chao Phraya River, one of five vicinity provinces around Bangkok; founded as Ban Talat Khwan in B.E. 2092, made a province in 1946, 622.38 km², now a dense Bangkok suburb.
Nontheism
Nontheism is the absence or rejection of belief in any deity, an umbrella term covering atheism, agnosticism, and related stances. Distinct from atheism (the proposition that no gods exist) and agnosticism (the claim that God's existence is unknowable), it includes nontheistic religions such as Jainism and strands of Buddhism.
Nonthermal plasma CO2 conversion
Nonthermal plasma CO2 conversion is a chemical process in which energetic electrons split stable CO2 into carbon monoxide and oxygen without heating the bulk gas.
Nontoxic diffuse goitre
Nontoxic diffuse goitre (ICD-11 5A01.0, ICD-10 E04.0) is diffuse thyroid enlargement from follicular multiplication with normal thyroid function, no hyperthyroidism; precursor of nodular goitre.
Nontoxic multinodular goitre
Nontoxic multinodular goitre (ICD-11 5A01.2, ICD-10 E04.2) is a thyroid with multiple nodules from follicular multiplication and normal hormone function; managed by observation, surgery, or radioiodine, unlike its toxic counterpart.
Nontoxic single thyroid nodule
Nontoxic single thyroid nodule (ICD-11 5A01.1; ICD-10 E04.1): a solitary euthyroid thyroid nodule without hyperthyroidism, usually benign, evaluated by TSH, ultrasound risk stratification, and selective FNA.