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Topics referred to by the same term
18O or variant, may refer to: Oxygen 18 (18O), an isotope of oxygen with atomic mass number 18 (8 protons + 10 neutrons) 2019 Catalan general strike (18-O)
18O
Measure of the deviation in the ratio of stable isotopes oxygen-18 and oxygen-16
delta-O-18 is a measure of the deviation in ratio of stable isotopes oxygen-18 (18O) and oxygen-16 (16O). It is commonly used as a measure of the temperature
Δ18O
Chemical element with atomic number 8 (O)
burning zones of stars. Most 18O is produced when 14N (made abundant from CNO burning) captures a 4He nucleus, making 18O common in the helium-rich zones
Oxygen
Water made of uncommon hydrogen and oxygen isotopes
but non-radioactive forms of each element (deuterium, 2H; and oxygen-18, 18O). In theory, radioactive heavy isotopes of the elements could be used for
Doubly_labeled_water
Standard defining the isotopic composition of ocean water
relative to NBS-1: δ 2H SMOW/NBS-1 = 50 ‰, i.e., an enrichment of 5 %; δ 18O SMOW/NBS-1 = 8 ‰, i.e., an enrichment of 0.8 %. Later, researchers at the
Vienna Standard Mean Ocean Water
Vienna_Standard_Mean_Ocean_Water
Chemical compound
compound belonging to the ether family with the molecular formula of C 8H 18O. It is colorless, volatile, and flammable liquid and has peculiar ethereal
Dibutyl_ether
Chemical element with atomic number 87 (Fr)
isotopes with masses of 209, 210, and 211. 197Au + 18O → 209Fr + 6 n 197Au + 18O → 210Fr + 5 n 197Au + 18O → 211Fr + 4 n The francium atoms leave the gold
Francium
Heavy isotopes bonded to other heavy isotopes
active investigation. The carbonate clumped-isotope thermometer, or "13C–18O order/disorder carbonate thermometer", is a new approach for paleoclimate
Clumped_isotopes
Clade of reptiles
J.M. (2011). "Dinosaur body temperatures determined from isotopic (13C-18O) ordering in fossil biominerals". Science. 333 (6041): 443–445. Bibcode:2011Sci
Dinosaur
annual average relationship between hydrogen and oxygen isotope (oxygen-18 [18O] and deuterium [2H]) ratios in natural meteoric waters. The GMWL was first
Global_meteoric_water_line
Fourth letter in the Greek alphabet
Black–Scholes option pricing formula. Ratios of environmental isotopes, such as 18O/16O and D/1H from water are displayed using delta notation – δ18O and δD
Delta_(letter)
fuse oxygen into sulfur. Fluorine-18 is usually produced by irradiation of 18O-enriched water with high-energy (about 18 MeV) protons prepared in a cyclotron
Isotopes_of_oxygen
Malcolm Dole, describes an inequality in the ratio of the heavy isotope 18O (a "standard" oxygen atom with two additional neutrons) to the lighter 16O
Dole_effect
Methodology for the study of ancient temperatures
and proxies from organic molecules. Scientists use the isotopic ratio of 18O to 16O in ice, tree tissue, coral skeletons, speleothems, and sediments to
Paleothermometer
Types of regent in Japan
google.com/books?id=18oNAAAAIAAJ&pg=PP9&dq=nipon+o+dai+itsi+ran#PRA1-PA132,M1. Titsingh 1834, p. 142, https://books.google.com/books?id=18oNAAAAIAAJ&pg=PP142&dq=
Sesshō_and_Kampaku
Cyclical variations in the ratio of the abundance of oxygen
isotopes: 16O, 17O, and 18O, where the 16, 17 and 18 refer to the atomic mass. The most abundant is 16O, with a small percentage of 18O and an even smaller
Oxygen_isotope_ratio_cycle
Isotope of fluorine emitting a positron
of atmospheric argon or by reaction of protons with oxygen-18 in the air: 18O + p → 18F + n. In the radiopharmaceutical industry, fluorine-18 is made using
Fluorine-18
Type of interstellar cloud that obscures visible light
present are molecular hydrogen, atomic helium, C18O (CO with oxygen as the 18O isotope), CS, NH3 (ammonia), H2CO (formaldehyde), c-C3H2 (cyclopropenylidene)
Dark_nebula
Mass extinction event
for the significant global ice sheet growth is the higher concentration of 18O found in benthic foraminifera from oceanic sediment cores during this time
Middle_Miocene_disruption
Measurement of infrared radiation's interaction with matter
experimentally determined to be 832 and 788 cm−1 for ν(16O–16O) and ν(18O–18O), respectively. By considering the O–O bond as a spring, the frequency
Infrared_spectroscopy
Chemical element with atomic number 9 (F)
atmospheric argon as well as by reaction of protons with natural oxygen: 18O + p → 18F + n. Other radioisotopes have half-lives less than 70 seconds;
Fluorine
Form a book is produced into
sixteenmo 16º or 16mo 16 32 4 × 6+3⁄4 102 × 171 octodecimo or eighteenmo 18º or 18mo 18 36 4 × 6+1⁄2 102 × 165 trigesimo-secundo or thirty-twomo 32º or
Book_size
North Atlantic regional climate era, c. 950 - c. 1250
study from the University of Waikato found, Temperatures derived from an 18O/16O profile through a stalagmite found in a New Zealand cave (40°40′S 172°26′E
Medieval_Warm_Period
Analytical technique used to study isotopes
production draws upon the body water of the mother, which has higher levels of 18O due to the preferential loss of 16O through sweat, urine, and expired water
Isotope_analysis
Heir to the Spanish throne (born 2005)
September 2023. Retrieved 22 September 2023. "La princesa Leonor reúne por su 18º cumpleaños a las familias Borbón y Grecia en una celebración privada en El
Leonor,_Princess_of_Asturias
1968 chess tournament in Lugano, Switzerland
The 18th Chess Olympiad (Italian: Le 18º Olimpiadi degli scacchi), organized by FIDE and comprising an open team tournament, as well as several other
18th_Chess_Olympiad
Geologic eon, 4031–2500 million years ago
"Limited Archaean continental emergence reflected in an early Archaean 18O-enriched ocean". Nature Geoscience. 13 (3): 243–248. Bibcode:2020NatGe..13
Archean
Isotope of hydrogen with two neutrons
method of isotope separation, heavy water may be slightly richer in 17O and 18O. Due to both neutron capture and (n,α) reactions (the latter of which produce
Tritium
American actress and singer (born 1980)
idea how much it means to us". Retrieved March 20, 2025 – via Instagram. "18º Festival". Mar del Plata International Film Festival. Retrieved July 10,
Zooey_Deschanel
Plateau on Pacific coast of South America
ISSN 1988-4281. Valdés Cantallops, Javier (2002). Inventario de glaciares, entre los 18o y 32o de latitud sur : informe final de práctica (PDF) (Report) (in Spanish)
Atacama_Desert
International male beauty pageant competition
Colombia 1 2 3 14º Nicaragua 1 1 15º Denmark 1 1 16º Dominican Republic 1 1 2 17º Philippines 1 1 18º United States 3 3 19º Belgium 2 2 20º Chile 1 1
Mister_Tourism_International
using carbohydrates more recently produced from photosynthesis. SIP with 18O-labeled water can be used to find out which organisms are actively growing
Stable-isotope_probing
nuclear reactor pressure vessels". JOM. 53 (7): 18–22. Bibcode:2001JOM....53g..18O. doi:10.1007/s11837-001-0081-0. ISSN 1047-4838. S2CID 138790714. "Backgrounder
Neutron_embrittlement
Mathematical ratio used in analysis of radioactive materials
(~0.04% abundant). The ratio of 18O/16O in water depends on the amount of evaporation the water experienced (as 18O is heavier and therefore less likely
Isotopic_signature
Processes for the separation of isotopes
RA/RB where R is the ratio of the heavy to light isotope (e.g., 2H/1H or 18O/16O). Values for alpha tend to be very close to 1. There are four types of
Isotope_fractionation
Partial separation of isotopes in chemical equilibrium
isotopic paleothermometers (or climate proxies): D/H and 18O/16O records from ice cores, and 18O/16O records from calcium carbonate. It is thus important
Equilibrium_fractionation
Chemical compound
of neon-20 with deuterons, but usually is done by proton bombardment of 18O-enriched water, causing a (p-n) reaction (sometimes called a "knockout reaction" –
Fluorodeoxyglucose_(18F)
Form of water
more expensive than D2O due to the more difficult separation of 17O and 18O. H218O is also used for production of fluorine-18 in radiopharmaceuticals
Heavy_water
Transformation of a nuclide to another
14C (n,α) 6Li + n → T + α 10B + n → 7Li + α 17O + n → 14C + α 21Ne + n → 18O + α 37Ar + n → 34S + α (n,p) 3He + n → T + p 7Be + n → 7Li + p 14N + n →
Nuclear_reaction
Territory and oilfield in Venezuela
modified during a high-temperature thrusting event (120–125 °C), forming 18O-enriched diagenetic water (up to +4‰), which was diluted in recent times
Orinoco_Belt
Hand-powered projectile weapon
the original on 2019-07-28. Retrieved 2018-05-24. "Guadalcacín acoge el 18º Campeonato de España de Tirachinas". 3 August 2019. Francisco Casado López
Slingshot
Brazilian football club
Participants 1971 16º 20 1981 11º 44 1972 14º 26 1982 5º 1973 23º 40 1983 18º 1974 24º 1984 1º 41 1975 3º 42 1985 22º 44 1976 4º 54 1986 6º 48 1977 26º
Fluminense_FC
Greenland ice sheet temperatures interpreted with 18O isotope from 6 ice cores (Vinther, B., et al., 2009)
Neoglaciation
City in Imbabura, Ecuador
The climate is dry and mild and it has an average annual temperature of 18o C. On August 13, 1868 Atuntaqui was partially destroyed by an earthquake
Atuntaqui
Autonomous community of Spain
Andalusian Statute of Autonomy: Principios rectores de las políticas públicas: 18º La conservación y puesta en valor del patrimonio cultural, histórico y artístico
Andalusia
Portuguese noble family
Cavaleiros * 1350 D. Afonso Vasques de Sousa (1370) Diogo Lopes de Sousa, 18º Lord of House of Sousa * c. 1380 D.Afonso Vasques de Sousa II (1400), Álvaro
Sousa_family
Period of unusually cold climate in the North Atlantic region
Greenland ice sheet temperatures interpreted with 18O isotope from 6 ice cores (Vinther, B., et al., 2009)
Middle_Bronze_Age_Cold_Epoch
Field of geochemistry and hydrology
Air, freshwater and seawater contain mostly oxygen-16 ( 16O). Oxygen-18 (18O) occurs in approximately one oxygen atom in every five hundred and has a
Isotope_hydrology
Stony meteorite that does not contain chondrules
been determined on the basis of e.g. the Fe/Mn chemical ratio and the 17O/18O oxygen isotope ratios, thought to be characteristic "fingerprints" for each
Achondrite
Physical process of transition between basic states of matter
vapor condenses (an equilibrium fractionation), the heavier water isotopes (18O and 2H) become enriched in the liquid phase while the lighter isotopes (16O
Phase_transition
Hypothetical Neoproterozoic supercontinent
weathering of exposed rock. By inputting data on the ratio of stable isotopes 18O:16O[failed verification] into computer models, it has been shown that in
Rodinia
Geothermal region in Kenya
"Ground water/surface water interactions in Lake Naivasha, Kenya, using delta 18O, delta D, and 3H/3He age-dating". Ground Water. 39 (4): 526–33. doi:10.1111/j
Olkaria
Aqueous phase of minerals that have been dissolved by magma
600 °C. This deformation depleted host rocks of 18O, leading to further analysis of the ratio of 18O to 16O (δ18O). Water in equilibrium with igneous
Magmatic_water
Portuguese alcoholic drink
the use of jeropiga in wine. "Decreto Lei n.º 326/88 - Capítulo III art. 18º" (PDF) (in Portuguese). Diário da República. 29 September 1988. Archived
Jeropiga
Isotopic changes during fractional distillation
system containing molecules of two or more isotopic species (e.g., water with 18O and 16O, or sulfate with 34S and 32S), (2) the fractionation accompanying
Rayleigh_fractionation
Rare nuclides created when high-energy cosmic rays interact with the nucleus of an atom
387,000 y 11C Spallation (N and O) 20.3 min 14C 14N(n,p)14C 5,730 y 18F 18O(p,n)18F and Spallation (Ar) 110 min 22Na Spallation (Ar) 2.6 y 24Na Spallation
Cosmogenic_nuclide
Medical specialty
to accelerate protons to bombard the stable heavy isotope of oxygen 18O. The 18O constitutes about 0.20% of ordinary oxygen (mostly oxygen-16), from which
Nuclear_medicine
Extinct giant shark species
to 5.75 ± 0.9 Ma in age has been analyzed for isotope ratios of oxygen (18O/16O) and carbon (13C/12C), using a carbonate clumped-isotope thermometer
Megalodon
Chemical analysis method
structure of the analyte, using isotopes such as deuterium (2H), 13C, 15N and 18O. Selecting an internal standard in inductively coupled plasma spectroscopy
Internal_standard
Hexahydrated calcium carbonate mineral
and glendonites in high-latitude marine sediments. Similarly, the ratio of 18O to 16O, which varies in nature with temperature and latitude, can be used
Ikaite
Group of highly reactive chemical elements
in nature, most francium is synthesised in the nuclear reaction 197Au + 18O → 210Fr + 5 n, yielding francium-209, francium-210, and francium-211. The
Alkali_metal
Canadian racing driver (born 1971)
Retrieved 6 June 2021. "Thiago Camilo vence Corrida do Milhão; Villeneuve é 18º" [Thiago Camilo wins the Million Race; Villeneuve is 18th] (in Portuguese)
Jacques_Villeneuve
Application of mass spectrometry
(stable isotope labeling by amino acids in cell culture), trypsin-catalyzed 18O labeling, ICAT (isotope coded affinity tagging), and iTRAQ (isobaric tags
Protein_mass_spectrometry
Variable star in the constellation Corona Australis
Falk; Fryer, Christopher; Asplund, Martin (2007). "Very Large Excesses of 18O in Hydrogen-deficient Carbon and R Coronae Borealis Stars: Evidence for White
WX_Coronae_Australis
Synthesis of organic compounds from carbon dioxide by biological organisms
sodium bicarbonate) into organic matter Stable isotopes of Oxygen (16O, 18O and 17O) fluorescence kinetics (technique still a research topic) Stable
Primary_production
Separation of stable isotopes by their mass during unidirectional processes
with 16O) evaporate slightly more easily than heavier water molecules with 18O; this difference will be greater than it would be if the evaporation was
Kinetic_fractionation
Military unit
Especial de Fronteira), in Uiramutã 18th Mechanized Jungle Cavalry Regiment (18º Regimento de Cavalaria Mecanizado de Selva), in Boa Vista 10th Jungle Field
Amazon_Military_Command
French alpine skier (born 1977)
2007 in Åre, Sweden Downhill: 19º 2009 in Val d'Isère, France Downhill: 18º Super Giant: 22º 1999-2000: 87º 2000-2001: 55º 2001-2002: 36º 2002-2003:
Pierre-Emmanuel_Dalcin
Politics in the US state of North Carolina
William A. Jenkins (D) Thomas L. Clingman (D) 1859 John Willis Ellis (D) 32D, 18O 82D, 38O Thomas Bragg (D) 5D, 3O 1860 1861 Henry Toole Clark (D) 31D, 19W+O
Political party strength in North Carolina
Political_party_strength_in_North_Carolina
30Si 268Sg Successful reaction 244Pu 26Mg 270Sg Reaction yet to be attempted 248Cm 22Ne 270Sg Successful reaction 249Cf 18O 267Sg Successful reaction
Isotopes_of_seaborgium
Aviation accident in Australia
climbing to around 330 feet (100 m) AGL where it began to rock from around an 18º left angle of bank to then a 6º right angle of bank. At 1:15:32 pm, the aircraft
2020 Coulson Aviation Lockheed EC-130 crash
2020_Coulson_Aviation_Lockheed_EC-130_crash
Rally racing sports car (1973–1978)
9º Rallye de Portugal Vinho do Porto 1976 Sandro Munari Silvio Maiga 10 18º Rallye Sanremo 1976 Björn Waldegård Hans Thorszelius 11 20ème Tour de Corse
Lancia_Stratos
Port in Spain
5º de Europa, Algeciras 42º y 8º, Barcelona 63º y 12º y Las Palmas 95º y 18º, respectivamente.» "Top 50 World Container Ports | World Shipping Council"
Port_of_Algeciras
Brazilian consumer electronics company
Expert XP-800". www.old-computers.com. Retrieved 2023-05-20. "5ª Sucesu e 18º Cong. Nacional da Informática". Museu de Eventos - Anhembi (in Portuguese)
IGB_Eletrônica
British rally co-driver (1966–2005)
Greece 2003 Markko Märtin Ford Focus RS WRC 03 2 53rd Neste Rally Finland 3 18º Corona Rally México 2004 4 48ème Tour de Corse - Rallye de France Ford Focus
Michael_Park_(co-driver)
Diplomatic crisis in South America
5 December 2023. Retrieved 5 December 2023. "Exército Brasileiro ativa o 18º Regimento de Cavalaria Mecanizado em Boa Vista (RR)" (in Portuguese). Forças
Guyana–Venezuela crisis (2023–2024)
Guyana–Venezuela_crisis_(2023–2024)
Preserved physical characteristics allowing reconstruction of past climatic conditions
the 16O and 18O water molecule isotopologues in an ice core helps determine past temperatures and snow accumulations. The heavier isotope (18O) condenses
Proxy_(climate)
Genus of flowering plants
Geraniol (C 10H 18O)
Rose
1985 Brazilian home computer
Expert XP-800". www.old-computers.com. Retrieved 2023-05-20. "5ª Sucesu e 18º Cong. Nacional da Informática". Museu de Eventos - Anhembi (in Portuguese)
Gradiente_Expert
half-life (t1/2) mode product 17F synth 64.37 s β+ 17O 18F trace 109.734 min β+ 18O 19F 100% stable Standard atomic weight Ar°(F) 18.998403162±0.000000005 18
Isotopes_of_fluorine
Rapid climate fluctuation in the last glacial period
spectral analysis of the American GISP2 isotope record showed a peak of [18O:16O] abundance around 1500 years. This was proposed by Schulz (2002) to be
Dansgaard–Oeschger_event
Topics referred to by the same term
beginning with 180 All pages with titles containing 180 18O (disambiguation) (one-eight-o; 18o) l80 (disambiguation) (L-eight-zero; l80) I80 (disambiguation)
180_(disambiguation)
Extinct species of mammoth
Burns, J. A. (1994). "Contribution of isotopic biogeochemistry (13C,15N,18O) to the paleoecology of mammoths (Mammuthus primigenius)". Historical Biology
Woolly_mammoth
Extinct genus of giant ground sloth
plants and drank water depleted in 18O while the latter ate a mix of both C3 and C4 plants and drank water enriched in 18O. Numerous palaeopathologies have
Eremotherium
Russian research station in Antarctica
bottom to top: insolation at 65°N due to Milankovitch cycles (connected to 18O); 18O isotope of oxygen; levels of methane (CH4); relative temperature; levels
Vostok_Station
Satellite associated with a planetary ring
Astronomy & Astrophysics. 576: A18. arXiv:1501.05911. Bibcode:2015A&A...576A..18O. doi:10.1051/0004-6361/201424461. ISSN 0004-6361. S2CID 38950384. Kenworthy
Shepherd_moon
Chemical compound
emission, with a half-life of 109.8 min. It is made by proton bombardment of 18O in a cyclotron or linear particle accelerator. It is an important isotope
Radioactive_tracer
Gas layer surrounding Mars
atmosphere in the past. While Mars and Earth have similar 12C / 13C and 16O / 18O ratios, 14N is much more depleted in the Martian atmosphere. It is thought
Atmosphere_of_Mars
American geologist (1925–2022)
pages 5167–5180. Manduca, C.A., L.T. Silver, and H.P. Taylor. "87Sr/86Sr and 18O/16O Isotopic Systematics and Geochemistry of Granitoid Plutons Across a Steeply
Leon_Silver
Chemical element with atomic number 8 (O)
half-life (t1/2) mode product 15O trace 122.27 s β+ 15N 16O 99.8% stable 17O 0.0384% stable 18O 0.205% stable Category: Oxygen view talk edit | references
Allotropes_of_oxygen
Brazilian footballer
Brasileirão". GloboEsporte (in Portuguese). 24 September 2025. "Volpi comemora 18º gol na carreira e projeta duelo entre River Plate e Bragantino pela Sul-Americana"
Tiago_Volpi
255Lr. The work provided evidence for an isomeric level in 255Lr. 243Am(18O,xn)261−xLr (x=5) This reaction was first studied in 1965 by the team at the
Isotopes_of_lawrencium
Brazilian racing driver (born 2004)
the original on 7 June 2025. Retrieved 12 July 2025. "Bortoleto atribui 18º lugar a azar com safety cars e três paradas em Ímola" [Bortoleto attributes
Gabriel_Bortoleto
French physicist
in Israel. With these targets, he discovered the narrow resonances in the 18O(p,a)15N nuclear reaction. These discoveries were immediately put to use in
Georges_Amsel
Position 1º 2º 3º 4º 5º 6º 7º 8º 9º 10º 11º 12º 13º 14º 15º 16º 17º 18º 19º 20º 21º 22º 23º 24º 25º 26º 27º 28º 29º 30º 31º 32º 33º 34º 35º 36º 37º 38º
Bandit_Big_Rig_Series
Group of rare meteorites
identifier. CI chondrites contain three stable oxygen isotopes (16O, 17O, and 18O) that, when plotted on a three-isotope diagram, occupy a specific field clearly
CI_chondrite
Ecoregion in the Democratic Republic of the Congo and Angola
ranges from 27º to 30 °C, and annual mean minimum temperature ranges from 18º to 21 °C. Average annual rainfall is 1400 mm across most of the ecoregion
Southern Congolian forest–savanna mosaic
Southern_Congolian_forest–savanna_mosaic
Academic discipline; implementation or management of policy
EU tourism industry. Studies in Business and Economics, 18(1): 275-297 (18º ed.). reference global. doi:10.2478/sbe-2023-0015.{{cite book}}: CS1 maint:
Public_administration
Parish in New Brunswick, Canada
readability. By the magnet of 1838, when declination in the area was between 18º and 19º west of north. The Territorial Division Act clause referring to magnetic
Hopewell_Parish
Rock consolidated from volcanic ash
1130/0016-7606(1985)96<1251:OATEOT>2.0.CO;2. Grunder, Anita L. (1987). "Low ?18O silicic volcanic rocks at the Calabozos caldera complex, southern Andes:
Tuff
18O
18O
18O
18O
Boy/Male
Hebrew
Pledge.
Girl/Female
Australian, Portuguese
Of the People
Girl/Female
Indian, Sanskrit
Younger; Daughter
Girl/Female
Tamil
Godavri | கோதாவரீ
A river
Boy/Male
French, German
Servant; Attendant
Female
French
Pet form of French Estelle, ESTÉE means "star."
Boy/Male
Hindu
Spear warrior
Girl/Female
Tamil
Lajjaka | லஜà¯à®œà®¾à®•à®¾
Modesty
Boy/Male
Hindu, Indian, Kannada, Marathi, Oriya, Sanskrit, Telugu
Principal; Controller
Girl/Female
Arabic, Muslim
Bird (Toucan)
18O
18O
18O
18O
18O