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vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Descrizione"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Descrizione</span> </div> </a> <ul id="toc-Descrizione-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Funzionamento" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Funzionamento"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Funzionamento</span> </div> </a> <ul id="toc-Funzionamento-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-L'uomo" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#L'uomo"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>L'uomo</span> </div> </a> <ul id="toc-L'uomo-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliografia" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bibliografia"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Bibliografia</span> </div> </a> <ul id="toc-Bibliografia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indice" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostra/Nascondi l'indice" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Mostra/Nascondi l'indice</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading">Quiescenza: differenze tra le versioni</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vai a una voce in un'altra lingua. Disponibile in 30 lingue" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-30" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">30 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B7%D9%88%D8%B1_%D8%A7%D9%84%D8%B3%D9%83%D9%88%D9%86" title="طور السكون - arabo" lang="ar" hreflang="ar" data-title="طور السكون" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Dormici%C3%B3" title="Dormició - catalano" lang="ca" hreflang="ca" data-title="Dormició" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Dormance" title="Dormance - ceco" lang="cs" hreflang="cs" data-title="Dormance" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Dormanz" title="Dormanz - tedesco" lang="de" hreflang="de" data-title="Dormanz" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Dormancy" title="Dormancy - inglese" lang="en" hreflang="en" data-title="Dormancy" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Dormi%C4%9Do" title="Dormiĝo - esperanto" lang="eo" hreflang="eo" data-title="Dormiĝo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Dormancia" title="Dormancia - spagnolo" lang="es" hreflang="es" data-title="Dormancia" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Puhkeseisund" title="Puhkeseisund - estone" lang="et" hreflang="et" data-title="Puhkeseisund" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Sorgorraldi" title="Sorgorraldi - basco" lang="eu" hreflang="eu" data-title="Sorgorraldi" data-language-autonym="Euskara" data-language-local-name="basco" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AE%D9%81%D8%AA%DA%AF%DB%8C" title="خفتگی - persiano" lang="fa" hreflang="fa" data-title="خفتگی" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Dormance" title="Dormance - francese" lang="fr" hreflang="fr" data-title="Dormance" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Suanacht" title="Suanacht - irlandese" lang="ga" hreflang="ga" data-title="Suanacht" data-language-autonym="Gaeilge" data-language-local-name="irlandese" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Dormencia" title="Dormencia - galiziano" lang="gl" hreflang="gl" data-title="Dormencia" data-language-autonym="Galego" data-language-local-name="galiziano" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%AA%D7%A8%D7%93%D7%9E%D7%94" title="תרדמה - ebraico" lang="he" hreflang="he" data-title="תרדמה" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A5%8D%E0%A4%95%E0%A5%8D%E0%A4%B0%E0%A4%AF%E0%A4%A4%E0%A4%BE_(%E0%A4%9C%E0%A5%80%E0%A4%B5%E0%A4%B5%E0%A4%BF%E0%A4%9C%E0%A5%8D%E0%A4%9E%E0%A4%BE%E0%A4%A8)" title="निष्क्रयता (जीवविज्ञान) - hindi" lang="hi" hreflang="hi" data-title="निष्क्रयता (जीवविज्ञान)" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/D%C3%B2mans" title="Dòmans - creolo haitiano" lang="ht" hreflang="ht" data-title="Dòmans" data-language-autonym="Kreyòl ayisyen" data-language-local-name="creolo haitiano" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%A1%D5%B6%D5%A3%D5%BD%D5%BF%D5%AB_%D5%BE%D5%AB%D5%B3%D5%A1%D5%AF" title="Հանգստի վիճակ - armeno" lang="hy" hreflang="hy" data-title="Հանգստի վիճակ" data-language-autonym="Հայերեն" data-language-local-name="armeno" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Dormansi" title="Dormansi - indonesiano" lang="id" hreflang="id" data-title="Dormansi" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E4%BC%91%E7%9C%A0" title="休眠 - giapponese" lang="ja" hreflang="ja" data-title="休眠" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%9C%B4%EB%A9%B4" title="휴면 - coreano" lang="ko" hreflang="ko" data-title="휴면" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Hibernacja_naturalna" title="Hibernacja naturalna - polacco" lang="pl" hreflang="pl" data-title="Hibernacja naturalna" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Dorm%C3%AAncia" title="Dormência - portoghese" lang="pt" hreflang="pt" data-title="Dormência" data-language-autonym="Português" data-language-local-name="portoghese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%B8%D0%B5_%D0%BF%D0%BE%D0%BA%D0%BE%D1%8F" title="Состояние покоя - russo" lang="ru" hreflang="ru" data-title="Состояние покоя" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Dormancy" title="Dormancy - Simple English" lang="en-simple" hreflang="en-simple" data-title="Dormancy" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Dormancia" title="Dormancia - slovacco" lang="sk" hreflang="sk" data-title="Dormancia" data-language-autonym="Slovenčina" data-language-local-name="slovacco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Dormanca" title="Dormanca - sloveno" lang="sl" hreflang="sl" data-title="Dormanca" data-language-autonym="Slovenščina" data-language-local-name="sloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr badge-Q70893996 mw-list-item" title=""><a href="https://sr.wikipedia.org/wiki/Dormantnost" title="Dormantnost - serbo" lang="sr" hreflang="sr" data-title="Dormantnost" data-language-autonym="Српски / srpski" data-language-local-name="serbo" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Kuisens" title="Kuisens - turco" lang="tr" hreflang="tr" data-title="Kuisens" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D1%82%D0%B0%D0%BD_%D1%81%D0%BF%D0%BE%D0%BA%D0%BE%D1%8E" title="Стан спокою - ucraino" lang="uk" hreflang="uk" data-title="Стан спокою" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E4%BC%91%E7%9C%A0" title="休眠 - cinese" lang="zh" hreflang="zh" data-title="休眠" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q162267#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespace"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Quiescenza" title="Vedi la voce [c]" accesskey="c"><span>Voce</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Discussione:Quiescenza&action=edit&redlink=1" rel="discussion" class="new" title="Vedi le discussioni relative a questa pagina (la pagina non esiste) [t]" accesskey="t"><span>Discussione</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" 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href="/wiki/Quiescenza"><span>Leggi</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Quiescenza&oldid=30774350&veaction=edit" title="Modifica questa pagina [v]" accesskey="v"><span>Modifica</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Quiescenza&action=edit&oldid=30774350" title="Modifica il wikitesto di questa pagina [e]" accesskey="e"><span>Modifica wikitesto</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Quiescenza&action=history" title="Versioni precedenti di questa pagina [h]" accesskey="h"><span>Cronologia</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Strumenti pagine"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" 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vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Quiescenza&action=edit&oldid=30774350" title="Modifica il wikitesto di questa pagina [e]" accesskey="e"><span>Modifica wikitesto</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Quiescenza&action=history"><span>Cronologia</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Generale </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Speciale:PuntanoQui/Quiescenza" title="Elenco di tutte le pagine che sono collegate a questa [j]" accesskey="j"><span>Puntano qui</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Speciale:ModificheCorrelate/Quiescenza" rel="nofollow" title="Elenco delle ultime modifiche alle pagine collegate a questa [k]" 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class="diff-title" lang="it"> <td colspan="2" class="diff-otitle diff-side-deleted"><div id="mw-diff-otitle1"><strong><a href="/w/index.php?title=Quiescenza&oldid=30774337" title="Quiescenza">Versione delle 16:57, 16 mar 2010</a> <span class="mw-diff-edit"><a href="/w/index.php?title=Quiescenza&action=edit&oldid=30774337" title="Quiescenza">modifica</a></span><span class="mw-diff-timestamp" data-timestamp="2010-03-16T15:57:07Z"></span></strong></div><div id="mw-diff-otitle2"><a href="/wiki/Utente:Gil-Estel2010" class="mw-userlink" title="Utente:Gil-Estel2010" data-mw-revid="30774337"><bdi>Gil-Estel2010</bdi></a> <span class="mw-usertoollinks">(<a href="/wiki/Discussioni_utente:Gil-Estel2010" class="mw-usertoollinks-talk" title="Discussioni utente:Gil-Estel2010">discussione</a> | <a href="/wiki/Speciale:Contributi/Gil-Estel2010" class="mw-usertoollinks-contribs" title="Speciale:Contributi/Gil-Estel2010">contributi</a>)</span><div class="mw-diff-usermetadata"><div class="mw-diff-userroles"></div><div class="mw-diff-usereditcount"><span>1 626</span> modifiche</div></div></div><div id="mw-diff-otitle3"> <span class="comment comment--without-parentheses">categoria più specifica</span></div><div id="mw-diff-otitle5"></div><div id="mw-diff-otitle4"><a href="/w/index.php?title=Quiescenza&diff=prev&oldid=30774337" title="Quiescenza" id="differences-prevlink">← Differenza precedente</a></div></td> <td colspan="2" class="diff-ntitle diff-side-added"><div id="mw-diff-ntitle1"><strong><a href="/w/index.php?title=Quiescenza&oldid=30774350" title="Quiescenza">Versione delle 16:57, 16 mar 2010</a> <span class="mw-diff-edit"><a href="/w/index.php?title=Quiescenza&action=edit&oldid=30774350" title="Quiescenza">modifica</a></span><span class="mw-diff-timestamp" data-timestamp="2010-03-16T15:57:41Z"></span> <span class="mw-diff-undo"><a href="/w/index.php?title=Quiescenza&action=edit&undoafter=30774337&undo=30774350" title=""Annulla" permette di annullare questa modifica e apre il modulo di modifica in modalità di anteprima. Permette di inserire una motivazione nell'oggetto della modifica.">annulla</a></span></strong></div><div id="mw-diff-ntitle2"><a href="/wiki/Utente:Gil-Estel2010" class="mw-userlink" title="Utente:Gil-Estel2010" data-mw-revid="30774350"><bdi>Gil-Estel2010</bdi></a> <span class="mw-usertoollinks">(<a href="/wiki/Discussioni_utente:Gil-Estel2010" class="mw-usertoollinks-talk" title="Discussioni utente:Gil-Estel2010">discussione</a> | <a href="/wiki/Speciale:Contributi/Gil-Estel2010" class="mw-usertoollinks-contribs" title="Speciale:Contributi/Gil-Estel2010">contributi</a>)</span><div class="mw-diff-usermetadata"><div class="mw-diff-userroles"></div><div class="mw-diff-usereditcount"><span>1 626</span> modifiche</div></div></div><div id="mw-diff-ntitle3"> <span class="comment comment--without-parentheses">aggiungo cat</span></div><div id="mw-diff-ntitle5"></div><div id="mw-diff-ntitle4"><a href="/w/index.php?title=Quiescenza&diff=next&oldid=30774350" title="Quiescenza" id="differences-nextlink">Differenza successiva →</a></div></td> </tr><tr> <td colspan="2" class="diff-lineno">Riga 32:</td> <td colspan="2" class="diff-lineno">Riga 32:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><br /></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>[[Categoria:Fisiologia animale]]</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>[[Categoria:Fisiologia animale]]</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div>[[Categoria:Fisiologia vegetale]]</div></td> </tr> </table><hr class='diff-hr' id='mw-oldid' /> <h2 class='diff-currentversion-title'>Versione delle 16:57, 16 mar 2010</h2> <div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><p>La <b>quiescenza</b> è lo stato di sospensione reversibile dei processi vitali fondamentali in un <a href="/wiki/Organismo_vivente" title="Organismo vivente">organismo vivente</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Descrizione">Descrizione</h2></div> <p>In natura vi sono numerosi <a href="/wiki/Plantae" title="Plantae">organismi vegetali</a> e <a href="/wiki/Animali" class="mw-redirect" title="Animali">animali</a> capaci di arrestare, in modo reversibile, i propri processi vitali fondamentali. Lo stato conseguente viene detto quiescenza, o anche <a href="/wiki/Torpore" title="Torpore">torpore</a>, <a href="/wiki/Ibernazione" title="Ibernazione">ibernazione</a>, <a href="/wiki/Animazione_sospesa" title="Animazione sospesa">animazione sospesa</a>. Anche il <a href="/wiki/Letargo" class="mw-redirect" title="Letargo">letargo</a> e la <a href="/wiki/Estivazione" title="Estivazione">estivazione</a> sono considerati forme di quiescenza. </p><p>Questo stato è caratterizzato da drastica riduzione dell'attività delle <a href="/wiki/Cellula" title="Cellula">cellule</a> e della loro produzione di energia, che può arrivare al totale arresto della motilità cellulare visibile al <a href="/wiki/Microscopio" title="Microscopio">microscopio</a>. </p><p>Esso sembra essere un meccanismo difensivo e di adattamento all'ambiente, che permette a quegli organismi di superare particolari stress ambientali, come condizioni estreme di <a href="/wiki/Temperatura" title="Temperatura">temperatura</a>, carenza estrema di <a href="/wiki/Ossigeno" title="Ossigeno">ossigeno</a>, lesioni fisiche, ecc. Si attiva in risposta alla condizione ambientale di stress, e si disattiva al ritorno della condizione normale. </p><p>Sono esempi comunemente noti di quiescenza: i <a href="/wiki/Seme" title="Seme">semi</a> che restano dormienti per anni nei terreni <a href="/wiki/Deserto" title="Deserto">desertici</a>, e germinano all'arrivo della pioggia; gli <a href="/wiki/Embrioni" class="mw-redirect" title="Embrioni">embrioni</a> del gamberetto <i><a href="/wiki/Artemia_salina" title="Artemia salina">Artemia salina</a></i> (scimmie di mare), che possono resistere diversi anni fuori dall'acqua, e quando reimmersi riprendono il loro sviluppo. </p> <div class="mw-heading mw-heading2"><h2 id="Funzionamento">Funzionamento</h2></div> <p>La cellula <a href="/wiki/Eukaryota" title="Eukaryota">eucariote</a> ha al suo interno vari <a href="/wiki/Organulo" title="Organulo">organelli</a> che sono specializzati in compiti diversi. In particolare i <a href="/wiki/Mitocondrio" title="Mitocondrio">mitocondri</a> sono specializzati nella produzione di molecole di <a href="/wiki/Adenosintrifosfato" class="mw-redirect" title="Adenosintrifosfato">ATP</a>, "carburante" che viene poi consumato dalla cellula per svolgere la sua attività complessiva. I mitocondri producono ATP attraverso il processo di <a href="/wiki/Fosforilazione_ossidativa" title="Fosforilazione ossidativa">fosforilazione ossidativa</a> che comporta l'uso di ossigeno. L'ossigeno arriva alla cellula attraverso il <a href="/wiki/Apparato_circolatorio" title="Apparato circolatorio">sistema circolatorio</a>. </p><p>Quando la presenza di ossigeno nell'ambiente si riduce quasi totalmente (condizione di anossia), l'organismo non è più in grado di assorbirlo e farlo arrivare alle sue cellule. I mitocondri non possono più svolgere la loro attività. E la cellula resta senza "carburante". In questa condizione di stress estremo scatta lo stato di quiescenza. </p><p>È la presenza nel <a href="/wiki/DNA" title="DNA">DNA</a> di specifici <a href="/wiki/Gene" title="Gene">geni</a> a determinare nelle condizioni di anossia l'attivazione dello stato di quiescenza. Possono quindi entrare in tale stato solo gli organismi geneticamente predisposti. </p><p>Quando invece la presenza di ossigeno nell'ambiente si riduce ma non completamente (condizione di ipossia), l'organismo continua ad assorbirlo, i mitocondri continuano a svolgere la loro attività, ma l'ATP prodotto sarà insufficiente per garantire alla cellula il suo pieno funzionamento, ed essa continuando l'attività si danneggerà. </p> <div class="mw-heading mw-heading2"><h2 id="L'uomo"><span id="L.27uomo"></span>L'uomo</h2></div> <p>Allo stato attuale delle conoscenze è ignoto se gli esseri umani siano geneticamente predisposti per l'attivazione dello stato di quiescenza. Suscitano interesse tra gli studiosi i diversi casi di sopravvivenza dopo <a href="/wiki/Congelamento" class="mw-redirect" title="Congelamento">congelamento</a>, registrati dalle cronache soprattutto nei paesi freddi. </p> <div class="mw-heading mw-heading2"><h2 id="Bibliografia">Bibliografia</h2></div> <ul><li>Mark B. Roth, Todd Nystul. <i>La vita sospesa</i>, «Le Scienze», 2005, n. 443, pp. 40-47</li></ul> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2></div> <ul><li><a href="/wiki/Animazione_sospesa" title="Animazione sospesa">Animazione sospesa</a></li> <li><a href="/wiki/Cellula" title="Cellula">Cellula</a></li> <li><a href="/wiki/Ibernazione" title="Ibernazione">Ibernazione</a></li> <li><a href="/wiki/Metabolismo" title="Metabolismo">Metabolismo</a></li></ul></div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Estratto da "<a dir="ltr" href="https://it.wikipedia.org/w/index.php?title=Quiescenza&oldid=30774350">https://it.wikipedia.org/w/index.php?title=Quiescenza&oldid=30774350</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Categoria:Categorie" title="Categoria:Categorie">Categorie</a>: <ul><li><a href="/wiki/Categoria:Fisiologia_animale" title="Categoria:Fisiologia animale">Fisiologia animale</a></li><li><a href="/wiki/Categoria:Fisiologia_vegetale" title="Categoria:Fisiologia vegetale">Fisiologia vegetale</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Questa pagina è stata modificata per l'ultima volta il 16 mar 2010 alle 16:57.</li> <li id="footer-info-copyright">Il testo è disponibile secondo la <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.it">licenza Creative Commons Attribuzione-Condividi allo stesso modo</a>; possono applicarsi condizioni ulteriori. 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