{"id":6147,"date":"2026-10-19T09:48:34","date_gmt":"2026-10-19T09:48:34","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-liffraedi-zhiqian-yi\/"},"modified":"2026-10-19T09:48:34","modified_gmt":"2026-10-19T09:48:34","slug":"doktorsvorn-i-liffraedi-zhiqian-yi","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-liffraedi-zhiqian-yi\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed l\u00edffr\u00e6\u00f0i – Zhiqian Yi"},"content":{"rendered":"
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Doktorsefni:<\/strong>\u00a0Zhiqian Yi<\/p>\n

Heiti ritger\u00f0ar:<\/strong>\u00a0A\u00f0fer\u00f0ir \u00ed l\u00edft\u00e6kni til a\u00f0 auka framlei\u00f0slu fucoxanthins \u00ed k\u00edsil\u00fe\u00f6rungnum Phaeodactylum tricornutum<\/p>\n

Andm\u00e6lendur:<\/strong><\/p>\n

Dr. Hj\u00f6rleifur Einarsson, pr\u00f3fessor vi\u00f0 H\u00e1sk\u00f3lann \u00e1 Akureyri<\/p>\n

Dr. Roberta Congestri, v\u00edsindama\u00f0ur vi\u00f0 H\u00e1sk\u00f3linn \u00ed R\u00f3m \u2018Tor Vergata\u2019<\/strong><\/p>\n<\/p>\n

Lei\u00f0beinandi:<\/strong>\u00a0Dr. Weiqi Fu, gestad\u00f3sent vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og v\u00edsindama\u00f0ur vi\u00f0 New York University Abu Dhabi.<\/p>\n

Einnig \u00ed doktorsnefnd:<\/strong><\/p>\n

Dr. Sigur\u00f0ur Brynj\u00f3lfsson, pr\u00f3fessor vi\u00f0 I\u00f0na\u00f0arverkfr\u00e6\u00f0i-, v\u00e9laverkfr\u00e6\u00f0i- og t\u00f6lvunarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands (me\u00f0lei\u00f0beinandi)
Dr. Gu\u00f0mundur Hrafn Gu\u00f0mundsson, pr\u00f3fessor vi\u00f0 L\u00edf- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands
Dr. \u00d3ttar Rolfsson, pr\u00f3fessor vi\u00f0 L\u00e6knadeild H\u00e1sk\u00f3la \u00cdslands<\/strong><\/p>\n<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Sn\u00e6bj\u00f6rn P\u00e1lsson, pr\u00f3fessor og varadeildarforseti L\u00edf- og umhverfisv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

\u00c1grip<\/strong><\/p>\n

St\u00f3r hluti svif\u00fe\u00f6runga eru k\u00edsil\u00fe\u00f6rungar og finnast \u00feeir \u00ed v\u00f6tnum um allan heim \u00fear sem n\u00e6g n\u00e6ringarefni og lj\u00f3s eru til sta\u00f0ar. Sj\u00e1var\u00fe\u00f6rungar, eins og Phaeodactylum tricornutum, geta innihaldi\u00f0 miki\u00f0 magn fituefna og eru \u00fev\u00ed m\u00f6guleikar \u00e1 a\u00f0 n\u00fdta \u00fe\u00e1 til framlei\u00f0slu \u00e1 ver\u00f0m\u00e6tum l\u00edfefnum. Vonir eru bundnar vi\u00f0 \u00fe\u00e1 til framlei\u00f0slu \u00e1 l\u00edfeldsneyti og \u00fdmsum l\u00edfvirkum efnum eins og \u00f3mettu\u00f0um fitus\u00fdrum og kar\u00f3ten\u00f3\u00ed\u00f0um.<\/p>\n

Markmi\u00f0i\u00f0 \u00feessa verkefnis var a\u00f0 kanna m\u00f6gulegar a\u00f0fer\u00f0ir \u00ed l\u00edft\u00e6kni til a\u00f0 auka framlei\u00f0slu ver\u00f0m\u00e6tra efna \u00ed \u00fe\u00f6rungnum, s\u00e9rstaklega fucoxanthin. Fyrst var framkv\u00e6md \u00edtarlega heimildarvinna um form, vistfr\u00e6\u00f0i og \u00e6xlun k\u00edsil\u00fe\u00f6runga, s\u00ed\u00f0an er yfirlit yfir l\u00edfvirk efni \u00ed sm\u00e1\u00fe\u00f6rungum, s\u00e9rstaklega saltvatns-\u00fe\u00f6rungum. A\u00f0 lokum var \u00fe\u00f6rungurinn Phaeodactylum tricornutum rannsaka\u00f0ur n\u00e1nar. Honum var st\u00f6kkbreytt me\u00f0 \u00fatfj\u00f3lubl\u00e1u lj\u00f3si og r\u00e6kta\u00f0ur \u00ed margar kynsl\u00f3\u00f0ir (\u00fer\u00f3a\u00f0ur) me\u00f0 \u00fea\u00f0 fyrir augum a\u00f0 f\u00e1 fram afbrig\u00f0i me\u00f0 aukinn vaxtarhra\u00f0a og meiri myndun kar\u00f3ten\u00f3\u00ed\u00f0um. \u00datfj\u00f3lubl\u00e1tt lj\u00f3s (UVC) var nota\u00f0 til a\u00f0 valda st\u00f6kkbreytingum og afbrig\u00f0i af P. tricornutum voru s\u00ed\u00f0an valin til \u00e1framhaldandi r\u00e6ktunar. Afbrig\u00f0in voru r\u00e6ktu\u00f0 \u00ed margar kynsl\u00f3\u00f0ir til a\u00f0 \u00fer\u00f3a n\u00fdjar svipger\u00f0ir af P. tricornutum. Vi\u00f0 \u00feetta n\u00e1\u00f0ist aukin v\u00f6xtur \u00ed P. tricornutum \u00e1samt aukinni myndun ver\u00f0m\u00e6tra karten\u00f3\u00ed\u00f0a. A\u00f0 lokum var P. tricornutum st\u00f6kkbreytt me\u00f0 EMS (ethyl methanesulfonate) og afbrig\u00f0i me\u00f0 auknu fucoxanthin innihaldi valin me\u00f0 n\u00fdrri afastamikilli a\u00f0fer\u00f0 sem ger\u00f0i m\u00f6gulegt a\u00f0 velja j\u00e1kv\u00e6\u00f0 afbrig\u00f0i me\u00f0al \u00fe\u00fasunda afbrig\u00f0a. Fimm afbrig\u00f0i voru valin me\u00f0 \u00feessari a\u00f0fer\u00f0 og r\u00e6ktu\u00f0 \u00e1fram \u00ed tvo m\u00e1nu\u00f0i til a\u00f0 kanna st\u00f6\u00f0ugleika \u00feeirra. Fj\u00f6gur \u00feeirra s\u00fdndu st\u00f6\u00f0ugleika og j\u00f3kst fucoxanthin innihald \u00feeirra um 33%.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Zhiqian Yi lauk BS n\u00e1mi \u00ed l\u00e6knisfr\u00e6\u00f0i \u00ed j\u00fan\u00ed 2008 vi\u00f0 Tongji Medical College of Huazhong University of Science and Technology. Hann var a\u00f0sto\u00f0arl\u00e6knir 2009 til 2012 og f\u00e9kk l\u00e6knaleyfi \u00ed K\u00edna \u00ed n\u00f3vember 2010. Hann lauk meistarapr\u00f3fi \u00ed skur\u00f0l\u00e6kningum vi\u00f0 Wuhan Tongji Hospital. Hann h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands hausti\u00f0 2012.<\/p>\n

Vi\u00f0bur\u00f0ur \u00e1 Facebook<\/a><\/strong><\/p>\n


<\/strong><\/p>\n

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