{"id":64247,"date":"2020-05-25T08:45:29","date_gmt":"2020-05-25T05:45:29","guid":{"rendered":"http:\/\/realitatearutiera.ro\/?p=64247"},"modified":"2020-05-25T08:45:32","modified_gmt":"2020-05-25T05:45:32","slug":"o-cantitate-uriasa-de-polen-ramane-in-atmosfera-dupa-ploile-de-primavara","status":"publish","type":"post","link":"https:\/\/realitatearutiera.ro\/?p=64247","title":{"rendered":"O cantitate uria\u0219\u0103 de polen r\u0103m\u00e2ne \u00een atmosfer\u0103 dup\u0103 ploile de prim\u0103var\u0103"},"content":{"rendered":"\n<p><strong>Polenul este unul dintre cei mai puternici alergeni, afect\u00e2nd multe persoane. O cercetare recent\u0103 a demonstrat c\u0103 ploile de prim\u0103var\u0103 acutizeaz\u0103 problemele legate de polen \u00een loc s\u0103 le diminueze.<\/strong><\/p>\n\n\n\n<p>M\u0103sur\u0103torile polenului \u00een aer \u00een timpul \u0219i dup\u0103 ploile de prim\u0103var\u0103 au ar\u0103tat c\u0103 particule de polen pot r\u0103m\u00e2ne \u00een aer timp de 11 ore, motiv pentru care prezint\u0103 un risc de s\u0103n\u0103tate necunoscut anterior pentru persoanele cu alergii \u0219i astm.<\/p>\n\n\n\n<p>Cercet\u0103torii de Universitatea din Iowa (SUA) au descoperit dou\u0103 efecte diferite. \u00cen primul r\u00e2nd, ploaia a suprimat \u00eentr-adev\u0103r boabele de polen integral, a\u0219a cum era de a\u0219teptat. Dar m\u0103sur\u0103torile echipei au constatat o cre\u0219tere semnificativ\u0103 a fragmentelor acestor boabe.<\/p>\n\n\n\n<p>\u201eRezultatele noastre arat\u0103 c\u0103,&nbsp;<a href=\"https:\/\/www.descopera.ro\/natura\/17066301-albinele-robot-ar-putea-fi-dezvoltate-pentru-polenizare\" target=\"_blank\" rel=\"noreferrer noopener\">\u00een timp ce boabele de polen<\/a>&nbsp;scad substan\u021bial \u00een timpul ploii, concentra\u021biile maxime ale fragmentelor de polen ultramicronice apar \u00een timpul ploilor \u0219i apoi persist\u0103 c\u00e2teva ore\u201d, a afirmat chimista Elizabeth Stone de la Universitatea din Iowa,&nbsp;<a href=\"https:\/\/www.sciencealert.com\/a-shocking-amount-of-pollen-stays-in-the-air-after-spring-rain\" target=\"_blank\" rel=\"noreferrer noopener\">citat\u0103 de Science Alert<\/a>.<\/p>\n\n\n\n<p>Aceasta atrage aten\u021bia c\u0103 persoanele sensibile la polen ar trebui s\u0103 evite s\u0103 ias\u0103 prim\u0103vara \u00een aer liber atunci c\u00e2nd sunt ploi, dar \u00een special furtuni, precum \u0219i c\u00e2teva ore mai t\u00e2rziu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Polenul ajunge de 10 ori mai sus de frontiera P\u0103m\u00e2ntului<\/h2>\n\n\n\n<p>Cercet\u0103rile din ultimii ani, efectuate \u00een special asupra polenului provenit de la mesteac\u0103n, au ar\u0103tat c\u0103 aceste boabe se fragmenteaz\u0103 \u00een condi\u021bii de umiditate. Buc\u0103\u021bile mici ap\u0103rute \u00een urma acestui fenomen se numesc particule subpolen.<\/p>\n\n\n\n<p>\u00cen urma altor studii s-a descoperit c\u0103 boabele de polen pot fi transportate p\u00e2n\u0103 la altitudini de 10 ori mai mari peste&nbsp;<a href=\"https:\/\/www.descopera.ro\/stiinta\/17369299-spatiul-s-ar-putea-afla-mult-mai-aproape-de-pamant-sustine-un-cercetator-de-la-harvard\" target=\"_blank\" rel=\"noreferrer noopener\">grani\u021ba dintre atmosfera P\u0103m\u00e2ntului \u0219i spa\u021biul cosmic<\/a>, aflat\u0103 la 100 de kilometri deasupra nivelului m\u0103rii.<\/p>\n\n\n\n<p>Polenul care ajunge \u00een stratul de nori se poate sparge \u00een particule subpolen, care revin apoi pe suprafa\u021ba P\u0103m\u00e2ntului prin pic\u0103turile de ploaie \u0219i curen\u0163ii de ap\u0103 descenden\u0163i.<\/p>\n\n\n\n<p>Din cauza faptului c\u0103 aceste particule subpolen sunt mult mai mici \u0219i mai u\u0219oare dec\u00e2t boabele de polen integral, ele pot r\u0103m\u00e2ne \u00een aer o perioad\u0103 mai lung\u0103 de timp. Acest interval de timp nu a putut fi cuantificat p\u00e2n\u0103 recent.<\/p>\n\n\n\n<p>Cercet\u0103torii de la Universitatea din Iowa au folosit o serie de instrumente de m\u0103surare a cantit\u0103\u021bii de polen din aer \u00een timpul a 28 de zile de precipita\u021bii ce au avut loc \u00een aprilie \u0219i mai 2019, \u00een Iowa City, inclusiv o furtun\u0103 sever\u0103 care a generat o tornad\u0103.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Particulele subpolenice r\u0103m\u00e2n \u00een aer p\u00e2n\u0103 la 11 ore, \u00een urma ploilor<\/h4>\n\n\n\n<p>Ace\u0219tia au descoperit c\u0103, de\u0219i num\u0103rul de particule subpolenice a atins v\u00e2rful \u00een timpul \u0219i imediat dup\u0103 ploaie, c\u0103z\u00e2nd destul de repede, un procent din ele ar putea r\u0103m\u00e2ne \u00een continuare \u00een aer.<\/p>\n\n\n\n<p>M\u0103surarea sporilor atmosferici a ar\u0103tat c\u0103 ele au r\u0103mas \u00een aer \u00eentre 2,5 \u0219i 11 ore. Cu c\u00e2t&nbsp;<a href=\"https:\/\/www.descopera.ro\/stiinta\/15018435-ce-influenteaza-precipitatiile-atmosferice-de-pe-terra-descoperire-de-proportii-dupa-15-ani-de-cercetari-nasa\" target=\"_blank\" rel=\"noreferrer noopener\">precipita\u021biile sunt mai abundente<\/a>, cu at\u00e2t particulele de subpolen plutesc mai mult timp \u00een aer.<\/p>\n\n\n\n<p>\u00cen urma acestei cercet\u0103ri, oamenii de \u0219tiin\u021b\u0103 au avertizat c\u0103 persoanele care sunt mai sensibile sau au alergie la polen ar trebui s\u0103 nu ias\u0103 afar\u0103 \u00een timpul ploilor sau furtunilor, \u00een sezonul polenului, \u0219i nici \u00een orele urm\u0103toare deoarece li se pot amplifica alergiile<\/p>\n\n\n\n<p>Cercetarea a fost\u00a0<a rel=\"noreferrer noopener\" href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.estlett.0c00213\" target=\"_blank\">publicat\u0103 \u00een \u201eEnvironmental Science &amp; Technology Letters\u201d<\/a>.<\/p>\n\n\n\n<p>sursa: descopera.ro<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Polenul este unul dintre cei mai puternici alergeni, afect\u00e2nd multe persoane. O cercetare recent\u0103 a demonstrat c\u0103 ploile de prim\u0103var\u0103<\/p>\n","protected":false},"author":1,"featured_media":64249,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":""},"categories":[6],"tags":[],"class_list":["post-64247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-social"],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/realitatearutiera.ro\/wp-content\/uploads\/2020\/05\/polen.jpg?fit=750%2C469&ssl=1","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p61naM-gIf","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/64247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=64247"}],"version-history":[{"count":1,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/64247\/revisions"}],"predecessor-version":[{"id":64250,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/64247\/revisions\/64250"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/media\/64249"}],"wp:attachment":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=64247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=64247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=64247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}