{"id":5382,"date":"2018-11-08T15:08:58","date_gmt":"2018-11-08T14:08:58","guid":{"rendered":"http:\/\/agora.xtec.cat\/institutcanplanas\/?p=5382"},"modified":"2019-11-15T18:55:30","modified_gmt":"2019-11-15T17:55:30","slug":"enquadrant-la-tardor","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/institutcanplanas\/general\/enquadrant-la-tardor\/","title":{"rendered":"Enquadrant la tardor"},"content":{"rendered":"

Al pati ens hem trobat amb aquesta fulla sobre una quadr\u00edcula de fons.<\/p>\n

<\/p>\n

<\/p>\n

La caiguda de les fulles<\/strong><\/a> \u00e9s l’efecte visible d’un seguit de canvis fisiol\u00f2gics complexos que tenen lloc a l’interior dels arbres. Els processos fisiol\u00f2gics que provoquen la caiguda de la fulla s\u00f3n estimulats pel fotoper\u00edode, es a dir, per l’escur\u00e7ament de les hores i la intensitat de la llum associades a l’arribada de la tardor, per b\u00e9 que s’acceleren tamb\u00e9 amb les baixes temperatures.<\/p>\n

Quan l’arbre comen\u00e7a a detectar aquests canvis inicia la producci\u00f3 d’un seguit de subst\u00e0ncies inhibidores del seu metabolisme, on hi destaquen, entre d’altres, l’\u00e0cid absc\u00edsic o l’etil\u00e8. Aquestes acaben implicant la formaci\u00f3 d’una capa de c\u00e8l\u00b7lules a la base de la fulla que entorpeix progressivament les connexions entre la branca i les fulles, un fet que acabar\u00e0 finalment provocant la caiguda de les fulles.<\/p>\n

La clorofil\u00b7la \u00e9s el pigment responsable del color verd de les fulles. Amb l’activaci\u00f3 dels mecanismes esmentats en arribar la tardor, la fulla no pot sintetitzar efica\u00e7ment la clorofil\u00b7la i perd gradualment el color verd, tot adoptant d’altres coloracions causades per altres pigments menys exigents en nutrients, i responsables de les tonalitats brunenques, grogoses o vermelloses. Finalment per\u00f2, les connexions entre la fulla i la branca queden aturades del tot, la fulla mor i acaba caient per gravetat o b\u00e9 \u00e9s enduta pel vent.<\/p>\n

D’altra banda aquesta fulla de la imatge est\u00e0 en proc\u00e9s de digitalitzaci\u00f3.\u00a0Els r\u00e0pids aven\u00e7os en imatge digital<\/strong><\/a> es van iniciar amb la introducci\u00f3 dels microprocessadors a principis de 1970, juntament amb els aven\u00e7os en emmagatzematge i tecnologies relacionades amb la pantalla. La invenci\u00f3 de la tomografia axial computada (exploraci\u00f3 per TAC), usant raigs X per produir una imatge digital d’un “tall” a trav\u00e9s d’un objecte tridimensional, va ser de gran import\u00e0ncia per al diagn\u00f2stic m\u00e8dic. Aix\u00ed com l’origen de les imatges digitals, la digitalitzaci\u00f3 d’imatges anal\u00f2giques ha perm\u00e8s la millora i restauraci\u00f3 d’artefactes arqueol\u00f2gics i va comen\u00e7ar a ser utilitzat en camps tan diversos com la medicina nuclear, l’astronomia, l’aplicaci\u00f3 de la llei, la defensa i la ind\u00fastria.<\/p>\n","protected":false},"excerpt":{"rendered":"

Al pati ens hem trobat amb aquesta fulla sobre una quadr\u00edcula de fons.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,29],"tags":[56,138,135],"class_list":["post-5382","post","type-post","status-publish","format-standard","hentry","category-general","category-portada","tag-medi-ambient","tag-meteorologia","tag-pati"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/posts\/5382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/comments?post=5382"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/posts\/5382\/revisions"}],"predecessor-version":[{"id":5974,"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/posts\/5382\/revisions\/5974"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/media?parent=5382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/categories?post=5382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/institutcanplanas\/wp-json\/wp\/v2\/tags?post=5382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}