Life and health

Hemiparesis

Hemiparesis is one-sided body weakness, usually from stroke or other brain, spinal cord, or nerve lesions; milder than hemiplegia, contralateral to brain lesions, treated with rehabilitation.

Hemiparkinsonism-hemiatrophy syndrome

Hemiparkinsonism-hemiatrophy syndrome (HPHA, HP-HA syndrome) is a rare parkinsonian disorder with unilateral body atrophy and ipsilateral bradykinesia, rigidity, and tremor, onset in adolescence or adulthood, prevalence under 1 per million, and variable levodopa response.

Hemipelvectomy

Hemipelvectomy, also called external hemipelvectomy or hindquarter amputation, is surgery removing an entire leg with part of the pelvis, usually for malignant bone or soft-tissue tumors.

Hemipenis

Hemipenis: paired male copulatory organ of snakes and lizards (squamates), stored inverted in the tail, with a sperm-carrying sulcus spermaticus and often spines; widely used in squamate taxonomy.

Hemipepsis ustulata

Hemipepsis ustulata, the flamed tarantula-hawk wasp (Dahlbom 1843), is a large southwestern US spider wasp that provisions nests with tarantulas; males defend palo verde perch territories, with residency predicted by body size.

Oct 20, 2026

Hemiplegia

Hemiplegia is severe or complete paralysis of one side of the body (ICD-11 MB53), usually from brain or spinal cord injury such as stroke; distinguished from hemiparesis (partial weakness), with flaccid and spastic forms.

Hemiptera

Hemiptera, the true bugs and allies (formerly split as Hemiptera and Homoptera), is an insect order of over 100,000 species with piercing-sucking mouthparts, four suborders: Sternorrhyncha, Auchenorrhyncha, Coleorrhyncha, Heteroptera.

Hemiptera as crop and household pests

Hemiptera, the true bugs, are major crop and household pests whose piercing-sucking mouthparts deform seeds and fruit, causing pre-harvest yield losses of 10 to 80% in major crops.

Hemiptera of Europe

The Hemiptera of Europe are the true bugs and their allies recorded from the European continent and its islands, including about 3,000 Heteroptera species, with Miridae the largest family.

Hemiptera of New Zealand

Hemiptera of New Zealand, the true bugs and their allies, comprise about 800 taxa, 82% to 92% of species endemic, with lineages tracing to Gondwanaland.

Hemiptera of North America

The Hemiptera of North America are the true bugs north of Mexico, about 3,850 species in 45 families, including plant bugs, stink bugs, and aquatic bugs.

Hemiramphus brasiliensis

Hemiramphus brasiliensis, the ballyhoo halfbeak (formerly Esox brasiliensis), is a schooling Atlantic halfbeak fish used mainly as bait for sailfish and marlin; IUCN Least Concern, matures near 20 cm.

Hemispatial neglect

Hemispatial neglect, also called unilateral spatial neglect or hemineglect, is a post-stroke attention disorder in which patients ignore the side of space opposite a brain lesion, usually the left after right hemisphere stroke.

Hemispherectomy

Hemispherectomy: neurosurgical removal or disconnection of one cerebral hemisphere to treat drug-resistant epilepsy. Includes anatomic hemispherectomy, functional hemispherectomy, and hemispherotomy; about 73% pooled seizure freedom, hydrocephalus the main complication.

Hemispherotomy

Hemispherotomy is a neurosurgical operation that disconnects one cerebral hemisphere from the rest of the brain to stop drug-resistant epilepsy, most often in children with extensive disease confined to that hemisphere.

Hemithyroidectomy

Hemithyroidectomy is an operation removing one lobe of the thyroid gland, usually with the isthmus, leaving the opposite lobe, parathyroids, and recurrent laryngeal nerve intact.

Hemitragus

Hemitragus, Hodgson 1841, is a caprine bovid genus now restricted to the Himalayan tahr (Hemitragus jemlahicus); molecular work showed the former three-tahr genus was polyphyletic, splitting out Arabitragus and Nilgiritragus.

Hemlock woolly adelgid

Hemlock woolly adelgid (Adelges tsugae), a Japanese sap-sucking insect invasive in eastern North America since about 1951, kills eastern and Carolina hemlocks; spread rates, ecology, and chemical and biological control.

Sep 21, 2026

Hemmo A. Drexhage

Hemmo A. Drexhage is a Dutch medical immunologist and professor emeritus at Erasmus MC, Rotterdam, known for research on thyroid autoimmunity, type 1 diabetes, and psychiatry.

Hemoadsorption

Hemoadsorption is an extracorporeal blood purification therapy in which blood passes through a cartridge of adsorbent beads to remove inflammatory mediators, endotoxin, or toxins, aiming to moderate sepsis, drug toxicity, and poisoning.

HEMOBOX study

HEMOBOX (NCT03863652) is a prospective multicenter observational study of 250 patients measuring hemostasis duration after PCI via the distal radial snuffbox approach, reporting mean 199 minutes, 99.2% success, and no radial artery occlusion.

Hemocyanin

Hemocyanin is a copper-containing oxygen-transport protein found in the hemolymph of many arthropods and molluscs, turning blue when oxygenated; keyhole limpet hemocyanin (KLH) serves as a vaccine carrier protein.

Hemocyte (sensu Arthropoda)

A hemocyte is a blood cell circulating in the hemolymph of insects, crustaceans, and other arthropods, serving as their principal innate immune defense cell and aiding clotting and wound repair.

Hemocytometry

Hemocytometry is a bench microscopy technique that counts cells in a known volume in a calibrated chamber, giving cell concentration and, with a vital dye, viability.

Hemodiafiltration

Hemodiafiltration is a kidney-failure blood-purification treatment combining the diffusive solute removal of hemodialysis with the convective removal of hemofiltration, clearing middle molecules and lowering mortality in randomized trials.

Hemodialysis

Hemodialysis filters wastes, extra salt, and water from blood through a dialyzer for kidney failure; in-center three times weekly or home schedules; access via AV fistula, graft, or catheter; invented by Willem Kolff in 1943.

Hemodilution

Hemodilution is the deliberate dilution of a patient's blood to reduce transfusions. In acute normovolemic hemodilution, blood is withdrawn after anesthesia and reinfused after surgery.

Hemodynamic assessment of pulmonary hypertension

Hemodynamic assessment of pulmonary hypertension is the measurement of pressures in the lungs' arteries, chiefly by right-heart catheterization, to diagnose pulmonary hypertension and classify it as pre- or post-capillary.

Hemodynamic monitoring

Hemodynamic monitoring is the measurement of circulatory variables, chiefly blood pressure and cardiac output, to guide treatment in critically ill patients, using tools from cuff pressure to invasive catheters.