All articles A–Z
519,064 articles
Development of the reproductive system
Development of the reproductive system: embryology of gonads, genital ducts, external genitalia, and gonadal descent from intermediate mesoderm. Indifferent stage until week 7; SRY, testosterone, and AMH drive male differentiation; female pathway is hormone-independent.
Development of the thymus
Development of the thymus describes how the thymus arises from the third pharyngeal pouch, descends to the chest, is colonized by T cell precursors, and undergoes fat replacement after puberty.
Development of the urinary system
Development of the urinary system: embryonic formation of kidneys, ureters, bladder, and urethra via pronephros, mesonephros, and metanephros stages, ureteric bud branching morphogenesis, nephron induction, and CAKUT malformations.
Development planning
Development planning is the practice by which governments of developing economies prepare formal medium-term plans that coordinate public investment, set growth targets, and guide resource allocation.
Development Plus
Development Plus (Rozwój Plus) is a Polish centre-right movement founded by Mateusz Morawiecki in April 2026, which split from PiS in July 2026, holds about 40 Sejm seats, and polls around 5%.
Development studies
Development studies, also called international development studies, is an interdisciplinary academic field examining how social, economic, political, and ecological factors interact in societal change across local and global levels.
Development theory
Development theory is the body of theory in economics and political science concerned with economic development, from structuralism and dependency theory to the Washington Consensus.
Development-induced displacement
Development-induced displacement is the forced movement of people from their homes, land, or livelihoods caused by development projects such as dams, mines, roads, and urban infrastructure.
Developmental and epileptic encephalopathy with spike-wave activation in sleep
DEE-SWAS, also called EE-SWAS and formerly ESES or CSWS, is a rare childhood epilepsy syndrome with regression of cognition, language, behavior, or motor skills tied to marked sleep-activated 1.5–2 Hz spike-and-wave EEG activity, onset at 2–12 years.
Developmental and reproductive toxicity testing
Developmental and reproductive toxicity (DART) testing exposes rats, rabbits, or other models to chemicals or drugs around pregnancy to measure effects on fertility and offspring development.
Developmental biology
Developmental biology, also called biological development, studies how a fertilized egg gives rise to an organism with differentiated tissues, a body plan, and functioning organs.
Developmental coordination disorder
Developmental coordination disorder (DCD, dyspraxia) is a neurodevelopmental motor disorder affecting about 5% of children, diagnosed by DSM-5 criteria, assessed with MABC-2/BOT-2, treated with task-oriented interventions, and lifelong in course.
Developmental delay-ataxia-hypotonia-facial dysmorphism syndrome
Developmental delay-ataxia-hypotonia-facial dysmorphism syndrome, better known as HADDS or EBF3 neurodevelopmental disorder, is a rare autosomal dominant neurodevelopmental disorder caused by EBF3 gene variants, marked by low muscle tone, ataxia, and speech delay.
Developmental delay-cervical spine anomalies-facial dysmorphism-intellectual disability syndrome
Developmental delay-cervical spine anomalies-facial dysmorphism-intellectual disability syndrome, or Al Kaissi syndrome (OMIM 617694), is a rare autosomal recessive CDK10 disorder with growth retardation, cervical vertebral segmentation defects, and intellectual disability.
Developmental disability
Developmental disability: group of conditions impairing physical, learning, language, or behavior areas beginning in childhood; also called developmental disorders. About 1 in 6 US children affected; includes ADHD, autism, cerebral palsy; shaped by DD Act, IDEA, ADA.
Developmental dysplasia of hip
Developmental dysplasia of the hip (DDH), formerly congenital dislocation of the hip, is a spectrum of infant hip abnormalities from instability to dislocation; screened by Ortolani and Barlow maneuvers and ultrasound, treated early with the Pavlik harness.
Developmental glaucoma
Developmental glaucoma, chiefly primary congenital glaucoma (PCG), is childhood glaucoma from abnormal trabecular meshwork and angle development causing elevated IOP; genes CYP1B1, LTBP2, TEK; treated surgically.
Developmental neuroscience
Developmental neuroscience studies how nervous systems develop across invertebrate, vertebrate, and human stages; its flagship journal, Developmental Neuroscience (Dev Neurosci, ISSN 0378-5866), was founded 1978 by Karger in Switzerland, now published by Oxford University Press.
Developmental odontogenic cysts
Developmental odontogenic cysts (ICD-11 DA05.0) are epithelium-lined jaw cysts arising from tooth-forming tissue remnants, including dentigerous cyst, odontogenic keratocyst, calcifying and glandular odontogenic cysts, lateral periodontal and gingival cysts, classified by the WHO 2022 edition.
Developmental psychobiology
Developmental psychobiology: field studying behavioral development across biological levels, and the Wiley journal (ISSN 0012-1630, founded 1968) that is the official journal of the ISDP.
Developmental psychology
Developmental psychology: life-span study of behavioral change. Frameworks include Piaget's stages, Vygotsky's sociocultural theory, Erikson's psychosocial stages, and attachment theory; distinct from child psychology, which covers only childhood.
Developmental science
Developmental science is an interdisciplinary field that describes, explains, and optimizes change across the life span, integrating developmental psychology, neuroscience, and biological, social, and behavioral sciences.
Developmental speech or language disorders
Developmental speech or language disorders (ICD-11 6A01) are neurodevelopmental conditions with subtypes for speech sound, speech fluency, and language disorder (DLD), affecting roughly 1 in 14 kindergartners.
Developmental speech sound disorder
Developmental speech sound disorder (ICD-11 6A01.0) is a childhood neurodevelopmental disorder of persistent, unintelligible pronunciation errors not explained by structural, sensory, or neurological causes; also called phonological disorder in DSM-5.
Developmental stage theories
Developmental stage theories (Freud, Erikson, Piaget, Kohlberg) describe human development as fixed sequences of qualitatively distinct stages; modern research favors gradual, domain-specific, culturally variable development.
Developmental state
A developmental state is a state that prioritizes economic growth and competitiveness through an elite bureaucracy steering markets, a term coined by Chalmers Johnson in 1982 for Japan.
Developmental venous anomaly
A developmental venous anomaly, formerly called a venous angioma, is a common benign congenital variant of the brain's venous drainage, in which small veins converge on one collector vein.
Developmentally appropriate practice
Developmentally appropriate practice (DAP) is a framework for early childhood education that matches teaching and curriculum to each child's age, development, and social and cultural context.
Deven Bharti
Deven Bharti (देवेन भारती), born 1968, is a 1994-batch Maharashtra-cadre IPS officer and Commissioner of Police, Mumbai since April 2025; former Maharashtra ATS chief, first Mumbai Special Police Commissioner (2023), and 26/11 attack investigator.
Deven Eastern
Deven Eastern, nose tackle for the Seattle Seahawks, drafted 242nd overall in 2026 out of Minnesota; three-year Gophers starter, All-Big Ten honorable mention in 2025.