72,234 articles
Hardy–Weinberg principle
The Hardy–Weinberg principle, stated independently by Hardy and Weinberg in 1908, gives genotype frequencies p², 2pq, q² at equilibrium in a large randomly mating population, forming the foundation of population genetics.
Hare
Hare, genus Lepus (European hare, Lepus europaeus; brown hare): long-eared, long-legged lagomorph living above ground, bearing precocial furred leverets after 42-43 days' gestation, unlike burrowing rabbits; runs up to 72 km/h.
Haridra khanda
Haridra khanda (Haridrā Khaṇḍa), also Haridra Khandam, is a classical Ayurvedic granular formulation with turmeric (Curcuma longa), ghee, milk, sugar, spices, and Lauha bhasma, used for urticaria and allergic skin disorders, dose 6 g.
Harinder Singh (immunologist)
Harinder Singh is an American immunologist known for defining how PU.1, IRF4, and IRF8 control blood and immune cell fates, and directs the Center for Systems Immunology at the University of Pittsburgh.
Harish Nair
Harish Nair is a pediatric infectious diseases epidemiologist at the University of Edinburgh, known for the first widely cited global burden estimates of RSV and influenza child pneumonia.
Haritala sodhana
Haritala sodhana (Haratala Shodhana) is the Ayurvedic purification of orpiment (arsenic trisulfide, As2S3), an Uparasa and Dhatuja Visha mineral, by Swedana or Bhavana in media such as Kushmanda Swarasa and Churnodaka, yielding Shodhita Haratala for Rasamanikya.
Harlan M. Krumholz
Harlan M. Krumholz, also known as Harlan Krumholz, is an American cardiologist at Yale known for building national measures of hospital quality and pressing for open trial data.
Harlan Parker Banks
Harlan Parker Banks (1913–1998) was an American paleobotanist at Cornell University, an authority on the earliest land plants, elected to the National Academy of Sciences in 1980.
Harlequin syndrome
Harlequin syndrome, a rare dysautonomic disorder first described by Lance et al in 1988, causes unilateral facial flushing and sweating with midline demarcation from contralateral anhidrosis, usually idiopathic or from sympathetic fiber disruption.
Harlequin-type ichthyosis
Harlequin-type ichthyosis (harlequin ichthyosis, harlequin fetus, ARCI4B) is a severe autosomal recessive congenital skin disorder caused by ABCA12 mutations, producing armor-like scale plates, ectropion, eclabium, and roughly 50% neonatal survival with retinoid therapy.
Harley W. Moon
Harley W. Moon (1936–2018) was an American veterinary pathologist who showed how E. coli attaches to the gut and directed the USDA's National Animal Disease Center.
Harmala alkaloid
Harmala alkaloids are β-carboline alkaloids (harmine, harmaline, harmalol, harmol, harmane, THH) from Peganum harmala and Banisteriopsis caapi; reversible MAO-A inhibitors used in ayahuasca, with antitumor and antidiabetic activities and serotonergic drug-interaction risks.
Harmful algal bloom
Harmful algal bloom (HAB): dense growth of algae or cyanobacteria in fresh or marine water producing toxins or oxygen depletion; driven by nutrients and warm water; cyanobacteria dominate freshwater, Karenia brevis Florida red tides.
Harminder Dua
Harminder Dua, full name Harminder Singh Dua, is a British ophthalmologist and professor at the University of Nottingham, known for discovering a previously undetected layer of the cornea.
Harmit Malik
Harmit Malik is an evolutionary biologist who studies genetic conflict at Fred Hutchinson Cancer Center in Seattle, where he is a professor and Howard Hughes Medical Institute Investigator.
Harmonia axyridis
Harmonia axyridis, the harlequin ladybird or multicolored Asian lady beetle, is an aphid-eating ladybird native to Asia, introduced worldwide for biocontrol since 1916, now invasive and harmful to native ladybirds through competition and intraguild predation.
Harmonic imaging
Harmonic imaging is an ultrasound method that forms diagnostic images from harmonic frequencies generated as the pulse travels through tissue, giving less noise and better contrast.
Harmonic motion imaging
Harmonic motion imaging (HMI) is an ultrasound-based elasticity imaging technique that assesses tissue stiffness by inducing oscillations with a focused ultrasound transducer and tracking the resulting displacement.
Harmonization of pesticide regulation in Africa
Harmonization of pesticide regulation in Africa lets one pesticide registration dossier support legal sales in several African countries at once, led by the Sahel's CSP since 1994.
Harold A. Chapman
Harold A. Chapman is an American physician-scientist and Professor of Medicine at UCSF, known for research on lung injury, repair, macrophage biology, and lung epithelial progenitors.
Harold A. Mooney
Harold A. Mooney, born in 1932 in Santa Rosa, California, is an American ecologist at Stanford University known for linking plant physiological ecology to global change biology.
Harold A. Sackeïm
Harold A. Sackeïm, also published as Harold Sackeim, is an American clinical psychologist who led electroconvulsive therapy research at Columbia for 30 years and is the founding editor of Brain Stimulation.
Harold A. Scheraga
Harold A. Scheraga was an American biophysical chemist who spent 73 years at Cornell University, showing how amino acid sequences determine protein structure, folding, and activity.
Harold Alan Pincus
Harold Alan Pincus, also published as Harold A. Pincus, is an American psychiatrist at Columbia University known for work on quality and measurement in mental health care.
Harold Amos
Harold Amos (1918–2003) was an American microbiologist at Harvard Medical School, known for work on animal cell culture and virology, and the first African American to chair an HMS department.
Harold C. Slavkin
Harold C. Slavkin, known as Hal Slavkin, was an American craniofacial developmental biologist and dental educator who directed the NIDCR from 1995 to 2000 and served as dean of USC's dental school.
Harold Charles Bold
Harold Charles Bold (1909–1987) was an American phycologist, C. L. Lundell Professor at the University of Texas, who classified green soil algae, joined the National Academy of Sciences in 1973, and created Bold's Basal Medium.
Harold Dudley
Harold Ward Dudley (1887–1935) was a British biochemist who discovered the enzyme glyoxalase with Henry Dakin, prepared the first international insulin standard, and isolated the ergot alkaloid ergometrine.
Harold E. Johns
Harold E. Johns (Harold Elford Johns) was a Canadian medical physicist who led the design of one of the first cobalt-60 cancer therapy units, the "cobalt bomb", in 1951.
Harold E. Lebovitz
Harold E. Lebovitz is an American endocrinologist and diabetologist, a longtime Professor of Medicine at SUNY Downstate known for research on hormone resistance and diabetes.