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Hydrogen
Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula . It is colorless, odorless, tasteless, non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter.However, most of the universe's mass is not in the form of baryons or chemical elements. See dark matter and dark energy. Stars such as the Sun are mainly composed of hydrogen in the plasma state. Most of the hydrogen on Earth exists in molecular forms such as water and organic compounds. For the most common isotope of hydrogen (symbol 1H) each atom has one proton, one electron, and no neutrons. In the early universe, the formation of protons, the nuclei of hydrogen, occurred during the first second after the Big Bang. The emergence of neutral hydrogen atoms throughout the universe occurred about 370,000 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-IIA
H-IIA (H-2A) is an active expendable launch system operated by Mitsubishi Heavy Industries (MHI) for the Japan Aerospace Exploration Agency. These liquid fuel rockets have been used to launch satellites into geostationary orbit; lunar orbiting spacecraft; '' Akatsuki'', which studied the planet Venus; and the Emirates Mars Mission, which was launched to Mars in July 2020. Launches occur at the Tanegashima Space Center. The H-IIA first flew in 2001. , H-IIA rockets were launched 45 times, including 39 consecutive missions without a failure, dating back to 29 November 2003. Production and management of the H-IIA shifted from JAXA to MHI on 1 April 2007. Flight 13, which launched the lunar orbiter SELENE, was the first H-IIA launched after this privatization. The H-IIA is a derivative of the earlier H-II rocket, substantially redesigned to improve reliability and minimize costs. There have been four variants, with two in active service (as of 2020) for various purposes. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H2 (manga)
is a Japanese baseball-themed manga series written and illustrated by Mitsuru Adachi. It was serialized in Shogakukan's ''Weekly Shōnen Sunday'' from July 1992 to November 1999, with its chapters collected in thirty-four ''tankōbon'' volumes. It was adapted into a 41-episode anime series and an 11-episode television drama series, ''H2: Kimi to Ita Hibi'', directed by Yukihiko Tsutsumi. As of August 2018, the H2 manga had over 55 million copies in circulation Synopsis During middle school, Hiro Kunimi (pitcher), Hideo Tachibana (third baseman and 4th batter), and Atsushi Noda (catcher) were friends and teammates on the same baseball team. Thanks to their skills, their school achieved an unbeaten record on their way to consecutive national championships. In the seventh grade Hiro also played matchmaker to Hideo and Hikari Amamiya, a neighborhood childhood friend who grew up with him as close as a sibling. At this time Hiro, victim of a delayed growth spurt, was a very short, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H2 (A&E Networks)
H2 (or History2) is a brand name owned by A&E Networks (a joint venture between the Hearst Communications and the Walt Disney Television division of The Walt Disney Company), used for a sister television channel of History. The brand was debuted in September 2011 when History International in the United States was relaunched as H2. The brand was expanded outside the U.S. since then. H2 in the United States was relaunched on February 29, 2016 as Viceland, but the H2 brand is still used for sister channels to History in other markets. A&E Networks began rebranding the remaining versions of H2 as History2, starting with Latin American version on January 1, 2019. On November 6, 2018, concerning Disney's proposed acquisition of 21st Century Fox, the European Commission required Disney to sell A&E's television operations in Europe, which include the versions of H2 in the area. Versions North America The H2 brand was introduced in the United States, when History International was re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Histamine H2 Receptor
H2 receptors are positively coupled to adenylate cyclase via Gs. It is a potent stimulant of cAMP production, which leads to activation of protein kinase A. PKA functions to phosphorylate certain proteins, affecting their activity. The drug betazole is an example of a histamine H2 receptor agonist. Function Histamine is a ubiquitous messenger molecule released from mast cells, enterochromaffin-like cells, and neurons. Its various actions are mediated by histamine receptors H1, H2, H3 and H4. The histamine receptor H2 belongs to the rhodopsin-like family of G protein-coupled receptors. It is an integral membrane protein and stimulates gastric acid secretion. It also regulates gastrointestinal motility and intestinal secretion and is thought to be involved in regulating cell growth and differentiation. Histamine may play a role in penile erection. Tissue distribution Histamine H2 receptors are expressed in the following tissues: ;Peripheral tissues *Gastric parietal cells (oxyn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H2 (DBMS)
H2 is a relational database management system written in Java. It can be embedded in Java applications or run in client-server mode. The software is available as open source software Mozilla Public License 2.0 or the original Eclipse Public License. History The development of the H2 database engine started in May 2004, and first published in December 2005. The database engine was written by Thomas Mueller. He also developed the Java database engine Hypersonic SQL. In 2001, the Hypersonic SQL project was stopped, and the HSQLDB Group was formed to continue work on the Hypersonic SQL code. The name H2 stands for Hypersonic 2, however H2 Does not share code with Hypersonic SQL or HSQLDB. H2 is built from scratch. Main features Use of SQL A subset of the SQL (Structured Query Language) standard is supported. The main programming APIs are SQL and JDBC, however the database also supports using the PostgreSQL ODBC driver by acting like a PostgreSQL server. Table types It is possible ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H2 (American TV Channel)
H2 (formerly History International) was an American specialty television channel that was owned by A+E Networks (a joint venture between the Hearst Corporation and the Disney–ABC Television Group), available on multi-channel television providers. Launching in 1998 as History International, a spin-off of the History Channel focused on international history, it re-launched as H2 in September 2011, primarily carrying reruns of documentary programming previously seen on its parent network from the mid-2000s onward, original historical and popular science documentaries, and pseudoscientific entertainment programs. The channel ceased operations on February 29, 2016 and was subsequently replaced by Viceland. History The network launched on November 16, 1998 as History Channel International (abbreviated as "HI" or variations on "H-INT"). It originally focused mainly on programs and specials focusing on world history. History International occasionally featured shows in languages other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prostaglandin H2
Prostaglandin H2 is a type of prostaglandin and a precursor for many other biologically significant molecules. It is synthesized from arachidonic acid in a reaction catalyzed by a cyclooxygenase enzyme. The conversion from Arachidonic acid to Prostaglandin H2 is a two step process. First, COX-1 catalyzes the addition of two free oxygens to form the 1,2-Dioxane bridge and a peroxide functional group to form Prostaglandin G2. Second, COX-2 reduces the peroxide functional group to a Secondary alcohol, forming Prostaglandin H2. Other peroxidases like Hydroquinone have been observed to reduce PGG2 to PGH2. PGH2 is unstable at room temperature, with a half life of 90-100 seconds, so it is often converted into a different prostaglandin. It is acted upon by: * Prostacyclin synthase to create prostacyclin * Thromboxane-A synthase to create thromboxane A2 and 12-(S)-hydroxy-5Z,8E,10E-heptadecatrienoic acid (HHT) (see 12-Hydroxyheptadecatrienoic acid) * Prostaglandin D2 synthase to cre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-IIB
H-IIB (H2B) was an expendable space launch system jointly developed by the Japanese government's space agency JAXA and Mitsubishi Heavy Industries. It was used to launch the H-II Transfer Vehicle (HTV, or ''Kōnotori'') cargo spacecraft for the International Space Station. The H-IIB was a liquid-fueled rocket, with solid-fuel strap-on boosters and was launched from the Tanegashima Space Center in southern Japan. H-IIB made its first flight in 2009, and had made a total of nine flights through 2020 with no failures. H-IIB was able to carry a payload of up to to Geostationary transfer orbit (GTO), compared with the payload of 4000-6000 kg for the H-IIA, a predecessor design. Its performance to low Earth orbit (LEO) was sufficient for the H-II Transfer Vehicle (HTV). The first H-IIB was launched in September 2009 and the last H-IIB was launched in May 2020. Development The H-IIB was a space launch vehicle jointly designed, manufactured and operated by JAXA and Mitsub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Buses Route H2
This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva London, Go-Ahead London (Blue Triangle, Docklands Buses, London Central, and London General), Metroline, RATP Dev Transit London (London Sovereign, London United and London Transit) Stagecoach London (East London, Selkent, and Thameside), Sullivan Buses and Uno. TfL-sponsored operators run more than 500 services. Non-TfL-sponsored operators include Arriva Shires & Essex, Arriva Southern Counties, Carousel Buses, Diamond South East, Go-Coach, First Berkshire & The Thames Valley, Metrobus, Southdown PSV, Stagecoach South and Trustybus. Classification of route numbers In Victorian times, passengers could recognise the owner and the route of an omnibus (Latin: "for everyone") only by its livery and its line name, with painted signs on the sides sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halloween II (2009 Film)
''Halloween II'' is a 2009 American slasher film written, directed, and produced by Rob Zombie. The film is a sequel to Zombie's 2007 remake of 1978's ''Halloween'' and the tenth installment in the ''Halloween'' franchise. The story follows Laurie Strode as she deals with the aftermath of the previous film's events, Dr. Loomis who is trying to capitalize on those events with a new book, and Michael Myers as he seeks to reunite with his sister. The film sees the return of lead cast members from the 2007 film Malcolm McDowell, Scout Taylor-Compton, and Tyler Mane, who portray Dr. Loomis, Laurie Strode, and Michael Myers, respectively. For ''Halloween II'', Zombie decided to focus more on the connection between Strode and Myers, and the idea that they share similar psychological problems. He wanted the sequel to be more realistic and violent than its 2007 predecessor, and to portray how the events of the first film affected the characters. Zombie also wanted to provide a glim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armenia 2
Second Armenian TV Channel Company ( hy, Հայկական երկրորդ հեռուստաալիք), also known as H2 ( hy, Հ2) or Armenia 2, is a private television company broadcasting in Armenia and Artsakh. Approximately 95% of the TV viewers of Armenia and Artsakh are able to watch the channel, which broadcasts 18 hours daily. The company employs 250 people. The news block of the TV channel is called ''Lraber'' ( hy, Լրաբեր, meaning "Herald") which has its own reporters throughout Armenia and Artsakh. The international overview is carried out based on the German Deutsche Welle TV channel. H2 TV also cooperates with the Russian channels ''Russia-1'' and ''NTV'' and other foreign channels. The president and the director of the TV channel is Samvel Mayrapetyan. The offices and the studios of the TV are located in the Ajapnyak district of Yerevan Yerevan ( , , hy, Երևան , sometimes spelled Erevan) is the capital and largest city of Armenia and one of the worl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
