All articles starting with S
44,216 articles
Series resonant converter
A series resonant converter is a DC-DC power converter in which a series LC tank transfers energy through a high-frequency transformer, with output regulated mainly by varying switching frequency.
Serif
A serif is a small stroke at the end of a letter's main strokes, also the name for typefaces that carry them, as opposed to sans serif designs.
Šerif Konjević
Šerif Konjević is a Bosnian pop-folk singer, born in 1958 in Sanica, who debuted in 1975 and whose 1982 album Bijela vjenčanica broke Yugoslav sales records.
Serik Sapiyev
Serik Sapiyev (Серік Сәпиев, born 1983) is a Kazakh boxer, 2012 London Olympic welterweight champion and Val Barker Trophy winner, two-time world champion, later a Kazakh sports official and Asian Games 2026 preparation coordinator.
Serilingampalle
Serilingampalle, also spelled Serilingampally (Telugu: సెరిలింగంపల్లి), is a mandal in Rangareddy district, Telangana, India, forming the northwestern part of Hyderabad and containing the HITEC City technology area.
Serinda Swan
Serinda Swan (born 1984, West Vancouver, British Columbia) is a Canadian actress known for Breakout Kings, Graceland, Coroner, Marvel's Inhumans as Medusa, and Karla Dixon in Reacher season 2, plus education ventures Deedly and Blueprint Kids.
Serine
Serine (symbol Ser or S) is a polar, uncharged, proteinogenic amino acid, nutritionally nonessential because humans synthesize it, and a precursor for glycine, cysteine, sphingolipids, and one-carbon metabolism.
Serine and cysteine aminopeptidases
Serine and cysteine aminopeptidases are exopeptidases that remove amino acids from peptide N-termini using a catalytic serine or cysteine residue, unlike metal-dependent aminopeptidases, and include prolyl aminopeptidase and bleomycin hydrolase.
Serine carboxypeptidases
Serine carboxypeptidases are exopeptidase enzymes that use a catalytic serine to cleave amino acids from the C-terminal end of peptides; family S10 includes yeast carboxypeptidase Y.
Serine dehydratase
Serine dehydratase (SDS gene, EC 4.3.1.17, L-serine ammonia-lyase) is a PLP-dependent cytosolic liver enzyme converting L-serine to pyruvate and ammonia, gluconeogenic, glucagon-induced, and distinct from bacterial Fe-S and D-serine dehydratases.
Serine hydroxymethyltransferase
Serine hydroxymethyltransferase (SHMT, EC 2.1.2.1), a PLP-dependent enzyme converting serine and THF to glycine and 5,10-methylenetetrahydrofolate; cytosolic SHMT1 and mitochondrial SHMT2 drive one-carbon metabolism, embryonic development, cancer, and neurological disease.
Serine incorporator/TMS membrane protein
Serine incorporator/TMS membrane protein (IPR005016) is the SERINC family of multipass transmembrane proteins, five human paralogs implicated in phosphatidylserine and sphingolipid synthesis and, for SERINC3/5, in Nef-antagonized retroviral restriction.
Serine metabolism
Serine metabolism covers L-serine uptake, de novo synthesis from 3-phosphoglycerate via PHGDH, PSAT1, and PSPH, conversion to glycine and D-serine, one-carbon donation, serine deficiency disorders, and cancer dependence.
Serine palmitoyltransferase
Serine palmitoyltransferase (SPT, EC 2.3.1.50), an ER membrane PLP-dependent enzyme with SPTLC1/2/3, ssSPT, and ORMDL subunits, catalyzes the rate-limiting first step of sphingolipid synthesis; mutated in HSAN1 and ALS, inhibited by myriocin.
Serine protease
Serine proteases are peptide-bond-cleaving enzymes using a Ser-His-Asp catalytic triad, exemplified by trypsin and chymotrypsin; 152 human members drive digestion, coagulation, complement, and fibrinolysis.
Serine Proteases (Peptidase S1 Family)
Serine proteases of peptidase family S1 (trypsin-like proteases, clan PA) are serine-nucleophile protein-cleaving enzymes with a His57-Asp102-Ser195 triad on a two-β-barrel fold; the largest human protease family, spanning digestion, coagulation, complement, and immunity.
Serine-protein kinase RsbW
Serine-protein kinase RsbW (rsbW, orf159) is a bacterial anti-sigma factor and serine kinase (EC 2.7.11.1) that sequesters sigma B and phosphorylates RsbV, controlling the Gram-positive general stress response via partner switching.
Serine/threonine kinase
A serine/threonine kinase is an enzyme that transfers phosphate from ATP onto serine or threonine residues in proteins, the most common form of phosphorylation in eukaryotes.
Serine/threonine ligation
Serine/threonine ligation, introduced by Xuechen Li in 2010, joins a peptide salicylaldehyde ester to an N-terminal serine or threonine, forming a native peptide bond for protein synthesis.
Serine/threonine phosphatase
Serine/threonine phosphatases are enzymes that remove phosphate groups from phosphoserine and phosphothreonine residues in proteins, reversing serine/threonine kinases through two metal-dependent families, PPP (PP1, PP2A, calcineurin) and PPM (PP2C).
Serine/threonine transporter SstT
SstT (gene sstT, UniProt P0AGE4) is the Na+-coupled L-serine/L-threonine symporter of Escherichia coli K-12, a 414-residue DAACS-family transporter with serine KM 0.82 μM, distinct from SdaC, TdcC, LIV-I, YifK, and BrnQ.
Serine/threonine-protein kinase Mps1
Mps1/TTK (monopolar spindle 1 kinase) is a dual-specificity protein kinase that activates the spindle assembly checkpoint at unattached kinetochores; overexpressed in tumors, targeted by five experimental inhibitors in clinical trials.
Serine/threonine-protein kinase Rio2
Serine/threonine-protein kinase Rio2 (RIOK2) is an atypical kinase, essential in yeast and found in all archaea and eukaryotes, that matures the 40S ribosomal subunit via ATPase activity through a phosphoaspartate intermediate, unlike canonical kinases.
Serine/threonine-protein phosphatase with EF-hands
Serine/threonine-protein phosphatase with EF-hands (PPEF, also PP7): a PPP-family Ser/Thr phosphatase subfamily with C-terminal EF-hand calcium-binding motifs; Drosophila rdgC dephosphorylates rhodopsin, mammals have PPEF1 and PPEF2 in sensory neurons.
Serinflu
Serinflu: WHO-prequalified trivalent seasonal influenza vaccine (inactivated surface antigen) by Abbott Biologicals BV, Netherlands; 15 µg HA per strain per 0.5 ml dose, prequalified 25 May 2018, essentially similar to Influvac; distinct from quadrivalent Serinflu Tetra.
Serinus
Serinus is a genus of Fringillidae finches (canaries and serins) established by Koch in 1816, type species the European serin. Once large, it was shown polyphyletic; Afrotropical species moved to Crithagra, leaving about eight Eurasian-Afrotropical species including the wild canary.
Serinus serinus
Serinus serinus, the European serin (Girlitz, Serin cini), is a tiny streaked yellow finch of Europe, North Africa, and the Middle East; a recent range expander whose old populations declined 48% since 1980.
Seriola dumerili
Seriola dumerili, the greater amberjack (medregal coronado, sériole couronnée), is a circumglobal carangid fish of warm seas, reaching 190 cm and 80.6 kg, fished commercially and farmed, with IUCN status Least Concern.
Serious game
Serious game: a game designed primarily for education, training, health, or policy rather than entertainment; term coined by Clark Abt (1970), popularized by Ben Sawyer (2002); landmark example America's Army (2002).
Serious incident (aviation)
A serious incident in aviation is an incident indicating a high probability of an accident, defined by ICAO Annex 13 and investigated like an accident.