72,234 articles
Heliox
Heliox is a helium-oxygen breathing gas mixture (typically 70-80% helium) whose low density reduces turbulent airflow resistance in narrowed airways; used for airway obstruction, asthma, COPD, croup, and diving, with limited trial evidence of outcome benefit.
Helix pomatia
Helix pomatia, the Roman snail or Burgundy snail, is a large European helicid land snail (shell 3.8–5.0 cm) eaten as escargot de Bourgogne; IUCN Least Concern, stable, on EU Habitats Directive Annex IV.
Hellbender
Hellbender (Cryptobranchus alleganiensis), largest North American salamander, up to 2 feet; eastern and Ozark subspecies; breathes through skin folds; Missouri endangered 2021, range-wide listing proposed 2024.
Hellebore
Hellebore (Helleborus), also called Christmas rose or Lenten rose, is a genus of about 15 poisonous Ranunculaceae perennials native from Europe to N. China, flowering in late winter and spring, once famed in ancient Greek medicine as a cure for madness.
Helleborus
Helleborus, the hellebores, a genus of about 15-22 poisonous perennial species in Ranunculaceae native from Europe to the Caucasus, NW Africa, and N China; includes the Christmas rose H. niger and Lenten rose H. × hybridus.
Helleborus niger
Helleborus niger, the Christmas rose or black hellebore, is a poisonous Ranunculaceae perennial native to the Alps and Apennines, blooming white December to March, with cardiotonic helleborin and two subspecies, niger and macranthus.
Heller myotomy
Heller myotomy is a surgical operation for achalasia that divides the lower esophageal sphincter muscle, usually laparoscopically, relieving swallowing difficulty in 90 to 95% of patients.
Hellmut G. Augustin
Hellmut G. Augustin, born 1959, is a German vascular biologist and professor at Heidelberg University who heads vascular oncology research at the German Cancer Research Center.
HELLO trial
The HELLO trial was an international, cluster-randomized controlled trial led by Elie Azoulay that tested the four-week Hello Bundle, reducing burnout among ICU professionals across 60 countries.
HELLP syndrome
HELLP syndrome is a severe pregnancy complication defined by hemolysis, elevated liver enzymes, and low platelets, usually arising with preeclampsia, affecting 0.2 to 0.8 percent of pregnancies and often requiring prompt delivery.
Helmet jellyfish
Helmet jellyfish (Periphylla periphylla), also called twirling jelly, a red bioluminescent coronate scyphozoan of the twilight zone, 18-35 cm bell, worldwide except Arctic, with large blooms in Norwegian fjords.
Helminthiasis
Helminthiasis, also called parasitic worm infection, is infection of humans with intestinal worms such as roundworm, whipworm, and hookworms, affecting an estimated 1.5 billion people.
Helminthic therapy
Helminthic therapy is an experimental treatment in which patients are deliberately infected with parasitic worms or dosed with their eggs to modulate the immune system in autoimmune disease.
Helminthosporium
Helminthosporium (Link 1809) is a genus of mitosporic ascomycete fungi in Massarinaceae, type species H. velutinum; once a huge catch-all genus whose grass parasites were split into Bipolaris, Curvularia, Drechslera, and Exserohilum.
Helmut Baumgartner
Helmut Baumgartner is an Austrian-trained cardiologist who directed adult congenital and valvular heart disease at University Hospital Münster, published landmark aortic stenosis research in 2000, and chaired ESC guidelines.
Helmut Beinert
Helmut Beinert (1913–2007) was a German-born American biochemist at the University of Wisconsin–Madison who pioneered EPR spectroscopy of enzymes and discovered the iron-sulfur proteins of the mitochondrial respiratory chain.
Helmut Drexler
Helmut Drexler (1951–2009) was a German cardiologist who led the Department of Cardiology and Angiology at Hannover Medical School and led the BOOST bone-marrow cell therapy trial.
Helmut Grubmüller
Helmut Grubmüller (born 1965 in Munich) is a German computational biophysicist who directs the Department of Theoretical and Computational Biophysics at the Max Planck Institute for Multidisciplinary Sciences in Göttingen.
Helmut Kettenmann
Helmut Kettenmann is a German neurobiologist who studies glial cells and microglia, leading cellular neuroscience research at Berlin's Max Delbrück Center from 1993 to 2022.
Heloderma
Heloderma is the sole genus of the venomous lizard family Helodermatidae, with five species including the Gila monster and beaded lizards of the southwestern US, Mexico, and Guatemala, known for grooved-tooth venom delivery and the diabetes drug exenatide.
HELP-Vets study
HELP-Vets (Helping Veterans Experience Less Pain) study, NCT00230932, a VA cross-sectional cohort study (2006-2007, 528 veterans, VISN 22) evaluating the reliability of pain as the fifth vital sign and gaps in pain care.
Helper Viruses
Helper viruses: replication-competent viruses that enable defective or satellite viruses to replicate or coat themselves by complementing missing functions; examples include adenovirus or HSV helping AAV, P2 helping phage P4, and HBV helping HDV.
Helsinki University Hospital
HUS Helsinki University Hospital (HUS Helsingin yliopistollinen sairaala) is Finland's largest healthcare provider, organizing specialized care in Uusimaa; 26,500 employees, 711,000 patients yearly, teaching hospital of the University of Helsinki.
Helsmoortel-Van der Aa syndrome
Helsmoortel-Van der Aa syndrome (HVDAS, ADNP syndrome, OMIM 615873) is a rare autosomal dominant neurodevelopmental disorder caused by de novo loss-of-function ADNP variants, featuring intellectual disability, autism, hypotonia, dysmorphic facies, and multi-organ problems.
HEMACORD
Hemacord (HPC, Cord Blood) is the first FDA-licensed cord blood hematopoietic progenitor cell therapy (BLA 125397, New York Blood Center, approved November 10, 2011) for unrelated donor transplantation for hematopoietic and immunologic reconstitution.
Hemadsorption Inhibition Tests
Hemadsorption inhibition tests are virological assays in which erythrocytes bind virus-infected cell monolayers and specific antiserum blocks that binding, identifying hemadsorbing viruses such as influenza, parainfluenza, and mumps, or quantifying myxovirus antibodies.
Hemagarbha pottali rasa
Hemagarbha pottali rasa (हेमगर्भपोट्टली), also Hemgarbha Pottali, is an Ayurvedic herbo-mineral pottali of purified mercury, sulphur, gold and copper bhasmas with aloe juice; a 125 mg emergency-care formulation for Rajayakshma and Sannipataj conditions.
Hemagglutination
Hemagglutination is the clumping of red blood cells by antibodies, lectins, or viral proteins such as influenza hemagglutinin binding sialic acid; it underlies blood typing and the hemagglutination inhibition assay used for influenza serology.
Hemagglutination assay
The hemagglutination assay is a laboratory test that detects viruses such as influenza by watching red blood cells clump; its inhibition form measures antibodies instead.
Hemagglutination inhibition assay
The hemagglutination inhibition assay (HAI) is a serological test that quantifies antibodies blocking virus-induced clumping of red blood cells, and is the primary method for measuring influenza antibody responses.