{"id":18737,"date":"2013-07-26T11:33:04","date_gmt":"2013-07-26T09:33:04","guid":{"rendered":"https:\/\/ocasapiens-dweb.blogautore.repubblica.it\/?p=18737"},"modified":"2021-09-26T16:29:45","modified_gmt":"2021-09-26T14:29:45","slug":"longevita","status":"publish","type":"post","link":"https:\/\/archivio.ocasapiens.org\/index.php\/2013\/07\/26\/longevita\/","title":{"rendered":"Longevit\u00e0"},"content":{"rendered":"<p>Mettiamo che a riposo un fotone non abbia una massa zero&#8230; emb\u00e8?<\/p>\n<p><em>a massive photon sounds crazy and exotic, but it really is not. A massless photon is neither a theoretical prediction nor a necessity, but rather a phenomenological curiosity<\/em><\/p>\n<p>ma qualcosina in pi\u00f9, al massimo 10 alla meno 54 kg, e quindi decada in altre particelle.<\/p>\n<p>Visto che nei <a href=\"https:\/\/en.wikipedia.org\/wiki\/Black-body_radiation\" target=\"_blank\" rel=\"noopener\"><strong>dati<\/strong><\/a> di <a href=\"http:\/\/science1.nasa.gov\/missions\/cobe\/\" target=\"_blank\" rel=\"noopener\"><strong>COBE<\/strong><\/a> quelli della radiazione a microonde di fondo sembrano tutti vivi e vegeti dopo 13 miliardi e rotti anni, tenuto conto della dilatazione dello spazio-tempo e\u00a0salvo incidente durante il viaggio, quanto dura un fotone? <a href=\"http:\/\/physics.aps.org\/synopsis-for\/10.1103\/PhysRevLett.111.021801\" target=\"_blank\" rel=\"noopener\"><strong>s&#8217;\u00e8 chiesto<\/strong><\/a> lo studente\u00a0<a href=\"http:\/\/www.mpi-hd.mpg.de\/personalhomes\/jheeck\/\" target=\"_blank\" rel=\"noopener\"><strong>Julian Heeck<\/strong><\/a> del Max Planck a Heidelberg.<\/p>\n<p>Risposta: nelle microonde circa 3 anni e nello spettro visibile circa un miliardo di miliardi. Tutto ipotetico, semplificato e &#8220;ingenuo&#8221;, per esempio:<\/p>\n<p><em>A proper study of the challenging, but important, effects of the primordial plasma on this limit lies outside the scope of this Letter and will be left for future work.<\/em><\/p>\n<p><span style=\"font-family: Georgia;\">Il giovanotto ha un altro <a href=\"http:\/\/arxiv.org\/abs\/1306.0580\" target=\"_blank\" rel=\"noopener\"><strong>paper<\/strong><\/a> <\/span><span style=\"font-family: Georgia;\">in pubblicazione <\/span><span style=\"font-family: Georgia;\">sul tema della lunga durata.<\/span><\/p>\n<p style=\"text-align: center;\">*<\/p>\n<p style=\"text-align: left;\">Sull&#8217;<em>Economist<\/em>, <a href=\"http:\/\/www.economist.com\/news\/science-and-technology\/21582242-robotic-model-what-plants-get-up-under-surface-putting-down-roots\" target=\"_blank\" rel=\"noopener\"><strong>presentazione<\/strong><\/a> del progetto europeo <a href=\"http:\/\/www.plantoidproject.eu\/\" target=\"_blank\" rel=\"noopener\"><strong>Plantoid<\/strong><\/a> (robot che imitano la crescita delle radici) diretto da <a href=\"http:\/\/mbr.iit.it\/people\/iit-sssa\/center-coordinator\/barbara-mazzolai.html\" target=\"_blank\" rel=\"noopener\"><strong>Barbara Mazzolai<\/strong><\/a> all&#8217;IIT di Pontedera:<\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: Georgia;\"><em>One thing missing from the prototypes is a control system that responds to the root\u2019s environment. The plan is to fit the next generation of cones with sensors that look for whatever the root is designed to find, and control its growth accordingly. Writing the software for these sensors may illuminate how real roots work. According to Dr Mazzolai, the first person to ask about that was Charles Darwin. He could not come up with an answer, and 130 years later no one else has either.<\/em><\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: Georgia;\">La dott. Mazzolai conosce il\u00a0<a href=\"http:\/\/www.linv.org\/\" target=\"_blank\" rel=\"noopener\"><strong>dott. Mancuso<\/strong><\/a>?<\/span><\/p>\n<p style=\"text-align: center;\">*<\/p>\n<p style=\"text-align: left;\">In copertina di\u00a0<em>Science<\/em>, e tra altre cose da segnalare, un<strong> <a href=\"http:\/\/www.sciencemag.org\/content\/341\/6144\/387.full\" target=\"_blank\" rel=\"noopener\">paper<\/a><\/strong> di Steve Ramirez, Xu Liu, Michele Pignatelli\u00a0<em>et al.<\/em> del lab di Susumu Tonegawa al RIKEN-MIT, racconta on una sensazionale cascata di manipolazioni genetiche in vitro ed esperimenti in vivo per verificare la permanenza di falsi ricordi nell&#8217;ippocampo dei topi (<a href=\"http:\/\/www.nature.com\/nature\/journal\/v484\/n7394\/full\/nature11028.html\" target=\"_blank\" rel=\"noopener\"><strong>prima puntata<\/strong><\/a> su <em>Nature<\/em>, l&#8217;anno scorso).<\/p>\n<p style=\"text-align: center;\">*<\/p>\n<p style=\"text-align: left;\">Per accompagnare il terzo US \u00a0<a href=\"http:\/\/ncadac.globalchange.gov\/\" target=\"_blank\" rel=\"noopener\">National Climate Assessment<\/a>, dalla NASA\u00a0<a href=\"http:\/\/svs.gsfc.nasa.gov\/vis\/a010000\/a011200\/a011280\/index.html\" target=\"_blank\" rel=\"noopener\">animazioni<\/a> e\u00a0proiezioni per\u00a0<a href=\"http:\/\/svs.gsfc.nasa.gov\/vis\/a000000\/a004000\/a004028\/\" target=\"_blank\" rel=\"noopener\">piogge<\/a> e <a href=\"http:\/\/svs.gsfc.nasa.gov\/vis\/a000000\/a004000\/a004029\/\" target=\"_blank\" rel=\"noopener\">temperature<\/a> nel XXI sec., e\u00a0in Texas da <a href=\"http:\/\/www.skepticalscience.com\/texas-national-climate-assessment.html\" target=\"_blank\" rel=\"noopener\">Skeptical Science<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mettiamo che a riposo un fotone non abbia una massa zero&#8230; emb\u00e8? a massive photon sounds crazy and exotic, but it really is not. A massless photon is neither a theoretical prediction nor a necessity, but rather a phenomenological curiosity ma qualcosina in pi\u00f9, al massimo 10 alla meno 54 kg, e quindi decada in&hellip; <a class=\"more-link\" href=\"https:\/\/archivio.ocasapiens.org\/index.php\/2013\/07\/26\/longevita\/\">Continua a leggere <span class=\"screen-reader-text\">Longevit\u00e0<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,16,22,30],"tags":[2549,2740,4721,6014],"class_list":["post-18737","post","type-post","status-publish","format-standard","hentry","category-clima","category-fisica","category-neuroscienze","category-tecno","tag-falsi-ricordi","tag-fotoni","tag-national-climate-assessment","tag-robotica","entry"],"_links":{"self":[{"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/posts\/18737","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/comments?post=18737"}],"version-history":[{"count":2,"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/posts\/18737\/revisions"}],"predecessor-version":[{"id":41676,"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/posts\/18737\/revisions\/41676"}],"wp:attachment":[{"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/media?parent=18737"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/categories?post=18737"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/archivio.ocasapiens.org\/index.php\/wp-json\/wp\/v2\/tags?post=18737"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}