Desintoxicação de amoníaco

O amoníaco, apesar de ser necessário para alguns organismos, como as plantas, pode ser extremamente tóxico quando em concentrações elevadas nas células, ao provocar o desacoplamento das cadeias de transporte de electrões, o que significa que as células deixam de produzir ATP. De acordo com a quimiosmose, este processo necessita, para ocorrer satisfatoriamente, de uma determinada diferença de pH entre os dois lados de uma membrana semipermeável, como a dos cloroplastos ou das mitocôndrias. O funcionamento do processo implica que os hidrogeniões (núcleos de hidrogénio sem o respectivo electrão, ou seja, H+) não atravessem estas membranas. O amoníaco, contudo, atravessa-as. Ao mudar de um meio mais básico (no exterior), para um meio mais ácido (no interior da membrana), tem tendência a captar hidrogeniões, transformando-se em amónio (NH4) que volta a atravessar a membrana (para o exterior), onde libertará o hidrogenião e estará capaz de voltar a atravessar a membrana, num ciclo que altera por completo o pH dos organitos referidos e leva à incapacidade da célula em produzir energia. Assim, o organismo tem de proceder à desintoxicação de amoníaco.

Os animais excretam o amoníaco directamente (animais amonotélicos) ou transformam-no noutros compostos, que depois são eliminados do organismo. Entre os compostos azotados produzidos pelos animais para a sua posterior eliminação encontra-se a ureia (nos animais ureotélicos); o ácido úrico (nos animais uricotélicos), a guanina (nos aracnídeos) e a alantoína (nos insectos da ordem Diptera, como as moscas).

Ícone de esboço Este artigo sobre Biologia é um esboço. Você pode ajudar a Wikipédia expandindo-o.

Read other articles:

Johannesberg

Johannesberg Lambang kebesaranLetak Johannesberg di Aschaffenburg NegaraJermanNegara bagianBayernWilayahUnterfrankenKreisAschaffenburgSubdivisions5 OrtsteilePemerintahan • MayorPeter Zenglein (parteilos (CSU))Luas • Total13,63 km2 (526 sq mi)Ketinggian372 m (1,220 ft)Populasi (2013-12-31)[1] • Total3.894 • Kepadatan2,9/km2 (7,4/sq mi)Zona waktuWET/WMPET (UTC+1/+2)Kode pos63867Kode area telepon06021Pelat...

 

Craniella arb

Craniella arb Klasifikasi ilmiah Kerajaan: Animalia Upakerajaan: Parazoa Filum: Porifera Kelas: Demospongiae Ordo: Spirophorida Famili: Tetillidae Genus: Craniella Spesies: Craniella arb Craniella arb adalah spesies spons yang tergolong dalam kelas Demospongiae. Spesies ini juga merupakan bagian dari genus Craniella dan famili Tetillidae. Nama ilmiah spesies ini pertama kali diterbitkan pada tahun 1930 oleh de Laubenfels. Seperti spons pada umumnya, spesies ini memiliki tubuh yang berpori da...

 

Kassym-Jomart Tokayev

Kassym-Jomart TokayevTokayev pada 2020 Presiden KazakhstanPetahanaMulai menjabat 20 Maret 2019Perdana MenteriAlihan Smaiylov PendahuluNursultan NazarbayevPenggantiPetahanaKetua Senat KazakhstanMasa jabatan16 Oktober 2013 – 19 Maret 2019PresidenNursultan Nazarbayev PendahuluKairat MamiPenggantiDariga NazarbayevaMasa jabatan11 Januari 2007 – 15 April 2011PresidenNursultan Nazarbayev PendahuluNurtai AbykayevPenggantiKairat MamiDirektur Jenderal Kantor Perserikatan Bangs...

التهاب المفصل في الصدفية

التهاب المفصل في الصدفية التهاب المفاصل الحاد في الصدفية لكلا القدمين والكاحلين. لاحظ التغيرات في الأظافر.التهاب المفاصل الحاد في الصدفية لكلا القدمين والكاحلين. لاحظ التغيرات في الأظافر. معلومات عامة الاختصاص طب الرثية من أنواع التهاب المفاصل،  ومتلازمة،  وأمراض ا...

 

Super Bowl XXIII

1989 Edition of the Super Bowl 1989 Super Bowl redirects here. For the Super Bowl that was played at the completion of the 1989 season, see Super Bowl XXIV. Super Bowl XXIII Cincinnati Bengals (1)(AFC)(12–4) San Francisco 49ers (2)(NFC)(10–6) 16 20 Head coach:Sam Wyche Head coach:Bill Walsh 1234 Total CIN 03103 16 SF 30314 20 DateJanuary 22, 1989 (1989-01-22)StadiumJoe Robbie Stadium, Miami, FloridaMVPJerry Rice, wide receiverFavorite49ers by 7[1][2]RefereeJerry Seema...

 

Bald Head, Maine

Bald Head Cliff Cliff and main rock formation as seen from a guest room at the Cliff House resort Bald Head is a village in the town of York in York County, Maine, United States,[1] on the Atlantic coast. The community takes its name from a nearby rock formation of the same name.[2] Bald Head has been noted for its unusual place name.[3] References ^ U.S. Geological Survey Geographic Names Information System: Bald Head, Maine ^ The Oddest Named Town in Every State. Th...

Ernest Simpson

Ernest SimpsonErnest Simpson pada tahun 1937Lahir(1897-05-06)6 Mei 1897New York City, New YorkMeninggal30 November 1958(1958-11-30) (umur 63)London, InggrisAlmamaterUniversitas HarvardSuami/istriDorothea Parsons Dechert (1923–1928)Bessie Wallis Warfield (m.1928–1937)Mary Kirk Raffray (1937–1941)Avril Leveson-Gower II (1948–1958)AnakAudrey SimpsonErnest Henry Child Simpson (aka Aharon Solomons)Orang tuaErnest Louis SimpsonCharlotte Woodward Gaines Ernest Aldrich Simpson (6 Mei 18...

 

Andrezinho (calciatore 1983)

Andrezinho Nazionalità  Brasile Altezza 178[1] cm Peso 70[1] kg Calcio Ruolo Centrocampista Termine carriera 2019 Carriera Giovanili  Flamengo Squadre di club1 2001-2004 Flamengo119 (13)2004-2007 Pohang Steelers77 (18)2008 Nova Iguaçu0 (0)2008-2011 Internacional107 (13)2012-2013 Botafogo35 (8)[2]2013-2015 Tianjin Teda57 (11)2015-2017 Vasco da Gama55 (5)[3]2017→  Goiás21 (1)2018-2019 Nova Iguaçu8 (0)&...

 

KSNW

NBC/Telemundo affiliate in Wichita, Kansas KSNWWichita–Hutchinson, KansasUnited StatesCityWichita, KansasChannelsDigital: 15 (UHF)Virtual: 3BrandingKSN; KSN News 3Telemundo Kansas (on DT2)ProgrammingNetworkKansas State NetworkAffiliations3.1: NBC3.2: Telemundofor others, see § SubchannelsOwnershipOwnerNexstar Media Group(Nexstar Media Inc.)Sister stationsKSNC, KSNK, KSNG, KSNL-LDHistoryFirst air dateSeptember 1, 1955 (68 years ago) (1955-09-01)Former call signsKTVR (CP, ...

I Cry (Usher song)

2020 single by Usher I CrySingle by UsherReleasedJune 26, 2020Recorded2020Genre Pop soul Length3:39Label Brand Usher RCA Songwriter(s) Usher Raymond IV Nasri Atweh Jeff Gitelman Producer(s) Nasri Jeff Gitty Gitelman Usher singles chronology California (2020) I Cry (2020) Bad Habits (2020) Music videoI Cry on YouTube I Cry is a song by American singer-songwriter Usher. It was released as a standalone single on June 26, 2020 by Brand Usher and RCA Records. Originally a demo, the murder of Georg...

 

Rhyl Town Hall

Municipal building in Rhyl, Wales Rhyl Town HallNative name Neuadd y Dref RhylRhyl Town HallLocationWellington Road, RhylCoordinates53°19′11″N 3°29′29″W / 53.3198°N 3.4915°W / 53.3198; -3.4915Built1876ArchitectWood and TurnerArchitectural style(s)Gothic style Listed Building – Grade IIOfficial nameTown HallDesignated2 February 1981Reference no.1498 Shown in Denbighshire Rhyl Town Hall (Welsh: Neuadd y Dref Rhyl) is a municipal structure in Wellington...

 

Final da Copa Libertadores da América de 2010

Final da Copa Libertadores da América de 2010 Evento Copa Libertadores da América de 2010 Chivas Guadalajara Internacional FMF CBF 3 5 Jogo de ida Chivas Guadalajara Internacional 1 2 Relatório Data 11 de agosto Local Estádio Omnilife, Zapopan Árbitro ARG Héctor Baldassi Jogo de volta Internacional Chivas Guadalajara 3 2 Data 18 de agosto Local Estádio Beira-Rio, Porto Alegre Árbitro COL Óscar Ruiz ← Anterior Próxima → 2009 2011 A Final da Copa Libertadores da América de 2010 ...

Battle of Benfleet

894 battle between Vikings and Wessex Battle of BenfleetPart of Viking invasions of EnglandDate894LocationSouth Benfleet51°33′N 0°34′E / 51.55°N 0.56°E / 51.55; 0.56Result Anglo-Saxon victoryBelligerents WessexMercia VikingsCommanders and leaders Edward the ElderÆthelred, Lord of the Mercians UnknownCasualties and losses Unknown Combat losses unknownWomen and children capturedShips lostclass=notpageimage| Location within EssexvteViking invasions of...

 

I Am (EP của (G)I-dle)

I AmEP của (G)I-dlePhát hành2 tháng 5 năm 2018 (2018-05-02)Thu âm2018Thể loạiK-poptropical househip hopR&BThời lượng21:12Ngôn ngữHàn QuốcHãng đĩaCube EntertainmentThứ tự album của (G)I-dle ''I Am''(2018) I Made(2019) Đĩa đơn từ I Am LatataPhát hành: 2 tháng 5 năm 2018 I Am là mini album đầu tay của nhóm nhạc nữ Hàn Quốc (G)I-dle. Album được phát hành kỹ thuật số vào ngày 2 tháng 5 ...

 

Sébastien Chavanel

Sébastien Chavanel Sébastien Chavanel alla Quatre Jours de Dunkerque 2011 Nazionalità  Francia Altezza 182 cm Peso 75 kg Ciclismo Specialità Strada Termine carriera 2016 CarrieraSquadre di club 2003-2004 Br. la Boulangère2005-2006 Bouygues Télécom2007-2008 Française des Jeux2009 FDJ2010-2013 Europcar2014-2016 FDJ Statistiche aggiornate al febbraio 2017 Modifica dati su Wikidata · Manuale Sébastien Chavanel (Châtellerault, 21 marzo 1981) ...

Jwala Gutta

Jwala GuttaJwala (kanan) bersama dengan Ashwini Ponnappa.Informasi pribadiKebangsaanIndiaLahir7 September 1983 (umur 40)Siwan, Bihar, IndiaTinggi178 m (584 ft)[1]PeganganKiriPelatihS. M. ArifPasanganChetan Anand (2005–2011, bercerai)Ganda putri & campuranPeringkat tertinggi6 (XD) 8/5/201013 (WD) 12/22/2011 Rekam medali Mewakili  India Bulu tangkis putri Kejuaraan Dunia 2011 London Ganda putri Pesta Olahraga Persemakmuran 2006 Melbourne Tim Campuran 2010 Delhi...

 

Gene Shue

American basketball player and coach (1931–2022) Gene ShueShue at Maryland in 1954Personal informationBorn(1931-12-18)December 18, 1931Baltimore, Maryland, U.S.DiedApril 3, 2022(2022-04-03) (aged 90)Marina del Rey, California, U.S.Listed height6 ft 2 in (1.88 m)Listed weight170 lb (77 kg)Career informationHigh schoolTowson Catholic(Towson, Maryland)CollegeMaryland (1951–1954)NBA draft1954: 1st round, 3rd overall pickSelected by the Philadelphia WarriorsPlayin...

 

De l'or pour les braves

De l'or pour les braves Données clés Titre original Kelly's Heroes Réalisation Brian G. Hutton Scénario Troy Kennedy-Martin Musique Lalo Schifrin Acteurs principaux Clint EastwoodTelly SavalasDon RicklesCarroll O'ConnorDonald Sutherland Sociétés de production Avala FilmMetro Goldwyn MayerKatzka-Loeb Pays de production États-Unis Genre Guerre, comédie Durée 144 minutes Sortie 1970 Pour plus de détails, voir Fiche technique et Distribution. modifier De l'or pour les braves (Kelly's H...

Coventry Bees

English motorcycle speedway team Coventry BeesClub informationTrack addressBrandon StadiumCountryEnglandFounded1928Closed2018Websitewww.savecoventryspeedway.comClub factsColoursYellow and BlackTrack size301 metres (329 yd)Track record time57.6 secondsTrack record holderChris HarrisMajor team honours League Champions1968, 1978, 1979, 1987, 1988, 2005, 2007, 2010 Knockout Cup Winners1967, 2006, 2007 League Cup Winners1981, 1985, 1987 Craven Shield Winners1997, 2000, 2007, 2008 British Leag...

 

Keresidenan Tapanuli

Keresidenan Tapanuli Residentie TapanoeliPemandangan pemukiman Eropa di Sibolga dengan latar belakang Teluk Sibolga.ProvinsiGouvernment Sumatra's westkust sampai 1905. Government Batavia dari tahun 1905 sampai 1938. Gouvernment Sumatra sejak tahun 1938 sampai 1942 [1]Ibu kotaSibolgaPopulasi (1851) • Total82,248Kecamatan7 afdeling, sampai tahun 1910 4 afdeling dari tahun 1910 Keresidenan Tapanuli (bahasa Belanda: Residentie Tapanoeli) atau Tapian Nauli adalah wilay...