All articles starting with S

Stress-responsive small RNAs in bacteria

Stress-responsive small RNAs are short bacterial non-coding RNAs, typically 50 to 200 nucleotides long, that base-pair with target messenger RNAs to repress or activate them during stresses.

Stress–energy tensor

The stress–energy tensor, also called the energy–momentum tensor, describes the density and flux of energy and momentum in spacetime and sources gravity in general relativity.

Stress–energy–momentum pseudotensor

The stress–energy–momentum pseudotensor, or stress-energy pseudotensor, is a coordinate-dependent object in general relativity representing the gravitational field's energy, momentum, and stress, introduced by Einstein in 1916.

Stress–strain analysis

Stress–strain analysis, also known as stress analysis, studies the relationship between stress applied to a material and the resulting strain, typically measured with a tensile test.

Stress–strain curve

A stress–strain curve is a graph produced by pulling a material in a tensile test, plotting stress against strain to record how it stiffens, yields, hardens, and fractures.

Stressed Out

Stressed Out is a 2015 single by Twenty One Pilots from Blurryface, written by Tyler Joseph and produced by Mike Elizondo. It peaked at No. 2 on the Billboard Hot 100, won the 2017 Grammy for Best Pop Duo/Group Performance, and has over 3.2 billion Spotify streams.

Stressed ribbon bridge

The stressed ribbon bridge, or catenary bridge, is a tension structure like a suspension bridge with the cables embedded in a thin deck following a catenary arc.

Stretch (2014 film)

Stretch (2014) is a Joe Carnahan action comedy starring Patrick Wilson, Chris Pine, Jessica Alba, and Ed Helms. Made for about $5 million, it was dropped by Universal from its March 2014 theatrical release and issued digitally on October 7, 2014, earning an 88% Rotten Tomatoes critics score.

Stretch (rapper)

Stretch (rapper) is Randy "Stretch" Walker (1968–1995), Queens rapper-producer of Live Squad, 2Pac's close collaborator, accused after the 1994 Quad Studios shooting, killed in Queens in 1995; distinct from the East London grime rapper Stretch.

Stretch Armstrong

Stretch Armstrong is a stretchable action figure introduced in 1976 by Kenner Products, a latex strongman filled with gelled corn syrup that became one of the most popular toys of the late 1970s.

Stretch forming

Stretch forming is a metalworking process that stretches sheet or extrusions in tension over a die beyond the yield point, producing smooth contours for aircraft skins and curved panels.

Stretch marks

Stretch marks (striae distensae) are linear dermal scars from rapid skin stretching, affecting 50-90% of pregnant women. Prevention creams lack evidence; tretinoin plus bipolar radiofrequency ranks best among treatments.

Stretch marks of pregnancy

Stretch marks of pregnancy (striae gravidarum) are atrophic linear scars affecting 50-90% of pregnant women, mainly on the abdomen, breasts, and thighs in the third trimester. Risk factors include young maternal age, family history, and weight gain; no topical preparation is proven to prevent them.

Stretch RE1

Stretch RE1 is a compact, lightweight mobile manipulator robot sold by Hello Robot for research, unveiled in July 2020 at 34 cm wide and 23 kg.

Stretch reflex

Stretch (myotatic, deep tendon) reflex: involuntary muscle contraction on rapid stretch, via monosynaptic Ia afferent–alpha motor neuron spinal connections; basis of knee jerk, ~20 ms upper-limb latency, delayed 14 ms in older adults.

Stretch-activated cation channel MID1/Yam8

MID1/Yam8: the stretch-activated, calcium-permeable nonselective cation channel of budding yeast (548 aa, Cch1 partner subunit), required for mating pheromone-induced Ca2+ influx; Yam8 is its fission yeast ortholog; unrelated to human or rice MID1 genes.

Oct 22, 2026

Stretchable organic transistors

A stretchable organic transistor is a carbon-based transistor that keeps operating while stretched or bent, typically by 5% or more, used in electronic skin and wearables.

Oct 22, 2026

Stretchable polymer semiconductors

Stretchable polymer semiconductors are conjugated polymers that combine charge transport with large mechanical deformation, the active layers of stretchable transistors for wearables, electronic skin, and bioelectronics.

Stretchers

Stretchers, also called gurneys, trolleys, or litters, are bed-like structures for transporting or holding patients in hospitals, ambulances, and rescue work; includes history, adverse-event data, powered models, and standards.

Stretching

Muscle stretching exercises (MeSH D052580) are exercises to increase muscle-tendon flexibility and range of motion, including static, dynamic, ballistic, active, passive, isometric, and PNF stretching; they improve ROM but do not reduce overall injury risk.

StretchSense

StretchSense is a New Zealand deep-technology company, founded in 2012 as a University of Auckland spin-out, that makes soft stretch sensors and motion capture gloves for hand tracking.

Stretton Mill Fort

Stretton Mill Fort: Roman auxiliary fort near Watling Street, Lapley, Stretton and Wheaton Aston, Staffordshire; cropmark site discovered by J.K. St Joseph in 1946, trenched 1947, pottery AD 50-200, scheduled monument 1006120.

Striatal cholinergic-GABAergic neuron

A striatal cholinergic-GABAergic neuron, or CGIN, is a large aspiny striatal interneuron that releases both acetylcholine and GABA, making up about half of the striatum's cholinergic interneurons.

Striate palmoplantar keratoderma

Striate palmoplantar keratoderma (keratosis palmoplantaris striata, Brünauer–Fuh–Siemens syndrome) is a rare autosomal dominant PPK with linear palmar hyperkeratosis, caused by DSG1, DSP, or KRT1 mutations.

Striated muscle cell

A striated muscle cell is a muscle cell whose actin and myosin filaments are organized into sarcomeres, giving it a striped appearance; the two kinds are skeletal and cardiac.

Striated Muscle Contraction

Striated muscle contraction: force generation in skeletal and cardiac muscle via actin-myosin ATP hydrolysis in sarcomeres, triggered by calcium binding troponin, with DHPR-RyR1 triads in skeletal and CICR in cardiac muscle.

Striated muscle tissue

Striated muscle tissue: skeletal and cardiac muscle with sarcomere-based actin-myosin banding, sliding-filament contraction, DHPR versus CICR calcium coupling, fiber types, and diseases such as DMD and rhabdomyolysis.

Striatin, N-terminal

Striatin, N-terminal (InterPro IPR013258, Pfam PF08232) is the conserved N-terminal domain of striatin family scaffold proteins STRN, STRN3, and STRN4, carrying caveolin-binding, coiled-coil, and calmodulin-binding motifs and the primary PP2A binding site of the STRIPAK complex.

Striatum

The striatum (caudate nucleus plus putamen) is the largest nucleus and primary input station of the basal ganglia, with D1 direct and D2 indirect pathways modulated by dopamine to select actions, support fast learning, and govern movement in health and disease.