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Disorders of sex development
Disorders/differences of sex development (DSD), formerly called intersex, are congenital conditions with atypical chromosomal, gonadal, or anatomical sex development, classified as 46,XX, 46,XY, or sex chromosome DSD, managed by multidisciplinary teams.
Disorders of sodium metabolism
Disorders of sodium metabolism (ICD-11 5C64.6) are dysnatremias: hyponatremia, serum sodium below 135 mmol/L, and hypernatremia, above 145 mmol/L, caused by disturbed water balance regulated by vasopressin and thirst.
Disorders of surfactant metabolism
Disorders of surfactant metabolism, also called surfactant dysfunction disorders (ICD-11 CB04.2), are rare genetic lung diseases from SFTPB, SFTPC, ABCA3, and NKX2-1 mutations, causing neonatal respiratory distress or interstitial lung disease.
Disorders of urea cycle metabolism
Urea cycle disorders (UCDs), also called disorders of urea cycle metabolism, are inherited defects in eight urea cycle enzymes or transporters causing hyperammonemia; about half present neonatally, OTC deficiency is the most common form.
Disorders of vestibular function
Disorders of vestibular function (ICD-11 AB34, formerly ICD-10 H81): inner-ear and brain disorders of the balance system causing vertigo, dizziness, and imbalance; includes BPPV, Menière's disease, vestibular migraine, and bilateral vestibulopathy.
Disorders of zinc metabolism
Disorders of zinc metabolism (ICD-10 E83.2, ICD-11 5C64.2) cover zinc deficiency states, chiefly acrodermatitis enteropathica (SLC39A4/Zip4) and transient neonatal zinc deficiency (SLC30A2), treated with oral zinc.
Disorganised behaviour
Disorganised behaviour (ICD-11 MB23.6, 行動の統合不全) is a coded symptom: unpredictable, non-goal-directed activity such as shouting at strangers, equivalent to ICD-10-CM R46.2 and a positive symptom of psychotic disorders.
Disorganised thinking
Disorganised thinking, also known as formal thought disorder, is a disruption of associative thought evident in speech, counted among the positive symptoms of psychosis, particularly schizophrenia.
Disorganized schizophrenia
Disorganized schizophrenia, also called hebephrenia or hebephrenic schizophrenia, was a DSM-IV schizophrenia subtype marked by disorganized speech and behavior and flat affect; eliminated from DSM-5 and ICD-11.
Disovo proleće
Disovo proleće is an annual poetry festival held in Čačak, Serbia, since 1964 in memory of poet Vladislav Petković Dis, running from March to May.
Disparida
Disparida is an extinct monophyletic clade of Paleozoic fossil crinoids, Ordovician to Permian, defined by a single circlet of calyx plates below the radials and sister to the Cladida.
Dispatch (band)
Dispatch: American indie folk-rock trio (Chad Stokes, Brad Corrigan, Pete Francis) formed 1996 at Middlebury College as One Fell Swoop; unsigned band famous for 'The General,' the 110,000-fan 2004 Hatch Shell farewell, and 2011 reunion.
Dispatch (video game)
Dispatch is a 2025 episodic superhero workplace comedy video game by AdHoc Studio, ex-Telltale developers. Aaron Paul voices Robert Robertson, a dispatcher managing villain-turned-hero Z-Team; sold 1 million copies in 10 days, BAFTA winner.
Dispatcher
A dispatcher, also known as a telecommunicator, is a public safety worker who answers 9-1-1 calls, determines an incident's nature and location, and coordinates police, fire, and medical response.
Dispatches from Elsewhere
Dispatches from Elsewhere is a 2020 AMC ten-episode limited series created by and starring Jason Segel, with Sally Field, Eve Lindley, André Benjamin, and Richard E. Grant, based on the Jejune Institute alternate reality game in San Francisco.
DispatchHealth
DispatchHealth Holdings is a private, Denver-based provider of in-home medical care, founded by emergency physician Mark Prather, which merged with Medically Home in 2025 and now enables health systems to deliver care at home.
DisPath
DisPath is a 2020 two-player graph theory game by Tahmina Begum in the Ludii system (DLP.Games.548), played on vertices or edges of any graph to build disjoint paths of size k, scoring points per path.
Dispensationalism
Dispensationalism, or dispensationalist theology, is a Protestant system dividing biblical history into dispensations and keeping Israel and the church distinct, arising in 19th-century Ireland and England.
Disperse Red 1
Disperse Red 1 is a synthetic azo dye used as a red colorant, mainly for polyester textiles, and a recognized skin sensitizer also studied in nonlinear optical polymers.
Dispersed settlement
Dispersed settlement: a rural settlement pattern of widely scattered farmsteads and houses, the opposite of nucleated villages; common in the United States, uplands, and enclosed landscapes.
Dispersin
Dispersin: name of two bacterial proteins; Dispersin B (DspB), an A. actinomycetemcomitans GH20 glycoside hydrolase degrading PNAG biofilm matrix, and EAEC dispersin, an AggR-controlled 10-kDa anti-aggregation surface protein.
Dispersion (optics)
Dispersion, or chromatic dispersion, is the dependence of a medium's refractive index on light's wavelength, separating white light in prisms and rainbows and causing chromatic aberration.
Dispersion (water waves)
Dispersion in water waves is the dependence of wave speed on wavelength, so in deep water longer waves outrun shorter ones and a mixed group spreads out.
Dispersion management
Dispersion management is a technique in optical fiber communications that alternates fiber segments with opposite dispersion signs so path-averaged dispersion stays low, shaping long-haul and submarine systems from the 1990s onward.
Dispersion polymerization
Dispersion polymerization is a form of precipitation polymerization in which a homogeneous solution of monomer, initiator, and stabilizer yields sterically stabilized, monodisperse spherical polymer particles, typically in polar organic media.
Dispersion relation
A dispersion relation, also called a dispersion equation, is the function relating a wave's angular frequency to its wavenumber; it determines phase velocity, group velocity, and how wave packets disperse.
Dispersion relations
Dispersion relations are linear integral equations relating the real and imaginary parts of scattering amplitudes, first derived by Kramers and Kronig in optics in 1926 and 1927 and rooted in causality.
Dispersion strengthening
Dispersion strengthening is a metallurgical hardening method in which fine, thermally stable second-phase particles block dislocation motion, best known in ODS alloys used up to about 1,200 °C.
Dispersion-compensating fiber
Dispersion-compensating fiber (DCF) is optical fiber engineered with large negative chromatic dispersion, deployed as spooled modules at amplifier sites to undo pulse spreading in long-haul systems.
Dispersion-flattened fiber
Dispersion-flattened fiber is an optical fiber whose chromatic dispersion is kept small and nearly constant over a wide wavelength range by balancing waveguide against material dispersion, useful for wavelength-division multiplexing.