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Suramin and A-317491 maximally reduced fV at 50 μM (EC50 = 30.4 and 10.8 μM) and abolished the hyperventilatory response to hypoxia. Purinergic P2X3 receptors were identified in neurons and O2 -chemosensory neuroepithelial cells of the gills using immunohistochemistry and confocal microscopy. These studies suggest a role for purinergic and nicotinic receptors in O2 sensing in fish and implicate ATP and acetylcholine in excitatory neurotransmission, as in the mammalian carotid body.


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Telefónica Germany GmbH & Co. OHG is a provider of broadband, landline and mobile telecommunications in Germany. The company trades as O2 (typeset as O2) and Alice. Previously Viag Interkom, it was acquired by Telefónica in 2006. The company was renamed from Telefónica O2 Germany to Telefónica Germany on April 1, 2011 following the completion of a merger with HanseNet. Telefónica Germany purchased E-Plus on 1 October 2014. As part of the purchase, Telefónica reduced its stake in its subsidiary to 62.1%.

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The 3Arena is a 14,500-capacity amphitheatre located at North Wall Quay in the Dublin Docklands in Dublin, Ireland, which opened on 16 December 2008. It was built on the site of the former Point Theatre, a smaller music venue which operated from 1988–2007, retaining only some of the outer facade. The Point Theatre was branded as "The Point Depot", in recognition of its original role as a railway goods handling station. From 2008 to 2014, it was known as The O2. Its 14,500 capacity makes it the largest indoor arena in Ireland. The venue was rebranded on 4 September 2014 as the 3Arena due to the takeover of O2 Ireland by Three Ireland.

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The LSWR O2 Class is a class of 0-4-4T steam locomotive designed for the London and South Western Railway by William Adams. Sixty were constructed during the late nineteenth century.

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Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds (notably oxides) with most elements. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At STP, two atoms of the element bind to form dioxygen, a diatomic gas that is colorless, odorless, and tasteless, with the formula .

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The Great Northern Railway (GNR) Class O2 was a class of three-cylinder 2-8-0 steam locomotive designed by Nigel Gresley for freight work and built by the GNR from 1921. Further examples were built by the London and North Eastern Railway (LNER) from 1924.

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Telefónica Europe plc was a European broadband and telecommunications company that traded as O2 (typeset as O2). The company originated as a collection of worldwide telecommunications companies, known in the later half of the 1990s as "BT Wireless", and a global mobile data business known then as "Genie Internet", both subsidiaries of British Telecommunications.

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The O2, visually typeset in branding as The O2, is a large entertainment district on the Greenwich peninsula in South East London, England, including an indoor arena, a music club, a Cineworld cinema, an exhibition space, piazzas, bars and restaurants. It was built largely within the former Millennium Dome, a large dome-shaped building built to house an exhibition celebrating the turn of the third millennium; as such, "The Dome" remains a name in common usage for the venue.

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Telefónica Ireland was a broadband and telecommunications provider in Ireland that traded under the O2 brand (typeset as O2). O2 Ireland was previously called Esat Digifone when it was owned by Esat Telecommunications (and Telenor) from 1997 to 2006.

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O2 is Gospel singer Tonéx's second major release. It was released under Zomba Records in 2002 and spawned two major hits, "God Has Not 4Got" and "Bout A Thang", which had a video for the single. The album reached number seven on the "Billboard" Top Gospel Albums chart, number twenty on the Top Contemporary Christian chart, number twenty on the Top Heatseekers chart, and number 66 on the R&B Albums Chart.

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The O2 was an entry-level Unix workstation introduced in 1996 by Silicon Graphics, Inc. (SGI) to replace their earlier Indy series. Like the Indy, the O2 used a single MIPS microprocessor and was intended to be used mainly for multimedia. Its larger counterpart was the SGI Octane. The O2 was SGI's last attempt at a low-end workstation.

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The O2 Arena (visually typeset in some branding as The O2 arena, referred to as North Greenwich Arena in the context of the 2012 Summer Olympics and 2012 Summer Paralympics) is a multi-purpose indoor arena located in the centre of The O2, a large entertainment complex on the Greenwich Peninsula in London. It is named after its main sponsor, the telecommunications company O2.

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Telefónica UK Limited (trading as O2 – stylised as O2) is a telecommunications and Internet services provider in the United Kingdom owned by Telefónica. It is the second-largest mobile telecommunications provider in the United Kingdom after EE Limited, and is headquartered in Slough.

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Telefónica Czech Republic (operating under the O2 brand) is a major integrated operator in the Czech Republic. It is now operating more than six million lines, both fixed and mobile, making it one of the Czech Republic’s leading providers of fully converged services. Telefónica Czech Republic operates a fixed and mobile network including a 3rd generation network, CDMA (for data), UMTS and EDGE, enabling voice, data and video transmission. Telefónica Czech Republic is also a provider of ICT services

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The Taff Vale Railway O2 class was a class of 0-6-2T steam tank locomotives designed by Tom Hurry Riches and introduced to the Taff Vale Railway in 1899.

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Panic Fancy is Japanese alternative rock (a.k.a. mixture rock) band Orange Range's fifth major studio album. Upon its launch on July 9, 2008, "Panic Fancy" topped the Japanese Oricon Album Charts at #1 position.

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In human genetics, Haplogroup O-P31 is a Y-chromosome DNA haplogroup. Haplogroup O-P31 is a descendant branch of the greater Haplogroup O-M175.

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O2 is the second studio album by American boyband O-Town, following the success of their triple-platinum self-titled debut album.