Life and health

Holaster

Holaster is an extinct Agassiz 1836 genus of heart-shaped holasteroid sea urchins (Holasteridae) from Cretaceous seas; type species H. laevis, distinguished from Cardiaster by lacking a marginal fasciole.

Holasteroida

Holasteroida is an order of irregular deep-sea sea urchins (Echinoidea) established by Durham & Melville, 1957, with 52 extant species, 49 fossil genera since the Cretaceous, and at least four independent deep-sea migrations.

Holcombe E. Grier

Holcombe E. Grier is an American pediatric oncologist and Professor of Pediatrics, Emeritus, at Harvard Medical School, based at Dana-Farber Cancer Institute, known for Ewing sarcoma trials and end-of-life care.

Holcophylloceras

Holcophylloceras (Spath, 1927) is an extinct phylloceratid ammonite genus, type species Phylloceras mediterraneum, ranging from the Toarcian or Bajocian to the Aptian in Tethyan and world-wide faunas.

Holcus

Holcus (velvetgrass) is a small genus of annual and perennial Poaceae grasses, tribe Poeae, subtribe Holcinae, native from Macaronesia and Europe to the Caucasus and South Africa; type species Holcus lanatus, Yorkshire fog, a forage grass and weed.

Holcus lanatus

Holcus lanatus, Yorkshire fog or velvet grass, is a tufted perennial grass native to Europe, Macaronesia, and the Caucasus, naturalized worldwide, a prolific seeder, pasture forage, lawn weed, and invasive in California coastal prairies.

Holcus mollis

Holcus mollis (creeping soft grass) is a rhizomatous perennial Poaceae grass native to Europe and NW Africa, with chromosome races 2n=28, 35, 42, 49, exserted awns, and bearded nodes, distinct from Holcus lanatus.

Holding space

Holding space: supportive practice of non-judgmental, present listening without fixing or judging, rooted in Winnicott's holding environment and popularized by Heather Plett's 2015 blog; used in therapy, coaching, and care.

Holectypoida

Holectypoida (ムカシタマゴウニ目) is an order of irregular sea urchins established by Duncan in 1889, placed as the stem group of Irregularia, with regular-appearing tests, Mesozoic fossil genera like Holectypus, and only a handful of living species.

Holger Dau

Holger Dau (born 1958) is a biophysicist known for research on photosynthetic water oxidation; his 2023 Nature paper identified the long-postulated S4 state of photosystem II as an oxygen-radical state.

Holger Dobbek

Holger Dobbek is a structural biologist and biochemist who has been professor of Structural Biology and Biochemistry at the Humboldt-Universität zu Berlin since 2009, known for his structures of carbon monoxide dehydrogenase.

Holger J. Schünemann

Holger J. Schünemann, also known as Holger Schünemann, is a physician-scientist in clinical epidemiology known for co-leading GRADE, the worldwide system for rating medical evidence.

Holger Jannasch

Holger Windekilde Jannasch (1927–1998) was a German-born microbial ecologist and oceanographer who pioneered deep-sea microbiology at the Woods Hole Oceanographic Institution, best known for showing how chemosynthetic bacteria sustain life at hydrothermal vents.

Holger K. Eltzschig

Holger K. Eltzschig is a German-trained anesthesiologist and physician-scientist who chairs anesthesiology at UTHealth Houston, known for NEJM reviews on hypoxia and inflammation and pharmacologic organ protection.

Holger Kreft

Holger Kreft is a German biogeographer and biodiversity scientist, full professor and head of the Department of Biodiversity, Macroecology & Biogeography at the University of Göttingen since 2017.

Holger Puchta

Holger Puchta (born 1960 in Ingolstadt) is a German molecular biologist and professor at the Karlsruhe Institute of Technology known for pioneering plant genome engineering and CRISPR/Cas chromosome restructuring.

Holger Sondermann

Holger Sondermann is a structural biologist known for crystal structures of the Ras activator Son of Sevenless and bacterial biofilm signaling, who joined DESY and Kiel University in 2020.

Holger Stark

Holger Stark is a German structural biologist and Max Planck director in Göttingen whose group determined protein structures by cryo-EM down to 1.25 ångströms in 2020.

Hölger Thiele

Holger Thiele (born 1969) is a German cardiologist who directs cardiology at the Heart Center Leipzig and is known for the cardiogenic shock trials ECLS-SHOCK, TOMAHAWK, and CULPRIT-SHOCK.

Oct 10, 2026

Holger Werfel Scheuermann

Holger Werfel Scheuermann (1877–1960) was a Danish surgeon and radiologist in Copenhagen who in 1920 described the rigid adolescent spinal deformity known as Scheuermann's disease, using X-rays to distinguish it from postural hunch-back.

Holger Willenbring

Holger Willenbring is a German-trained physician-scientist and Professor of Surgery at UCSF, where he directs the Liver Center and works on liver regeneration and stem-cell-based liver therapy.

Holin (phage lysis protein)

Holins are small phage-encoded membrane proteins that accumulate harmlessly in the host membrane until a genetically set moment, then permeabilize it, triggering lysis and timing progeny phage release.

Holistic Health

Holistic health is an approach to health care that treats the person as a complete, integrated unit, addressing physical, mental, emotional, social, and spiritual dimensions together.

Holland Lop

Holland Lop (Dwarf Lop in Europe): smallest lop-eared rabbit breed, developed by Adriann de Cock in Tilburg, Netherlands from French Lop and Netherland Dwarf crosses; Netherlands recognition 1964, ARBA 1979, maximum weight 4 lbs (1.8 kg).

Holliday junction branch migration complex subunit RuvB

RuvB, the Holliday junction branch migration complex subunit (E. coli ruvB, b1860), is a bacterial AAA+ ATPase motor that with RuvA drives Holliday junction branch migration in recombination and repair.

Hollis Cline

Hollis T. Cline is an American developmental neuroscientist who was a professor at Scripps Research, known for showing how visual experience guides the development of visual circuits.

Hollow fiber bioreactor

Hollow fiber bioreactor (HFBR): a membrane cell-culture system with semipermeable fibers in a cartridge; cells grow in the extracapillary space at ~10^9 cells/mL with low shear, used for antibodies, bioartificial livers, and tissue engineering.

Holly

Holly (Ilex, Aquifoliaceae): the sole genus of its family, over 664 dioecious tree and shrub species. Originated in subtropical Asia in the early Eocene; famous species include Ilex aquifolium, the Christmas holly.

Holly A. Ingraham

Holly A. Ingraham, also published as H. A. Ingraham, is a molecular endocrinologist at UCSF known for identifying Pit-1 and for showing SF-1 drives gonadal sex differences.