{"id":5953,"date":"2026-10-19T09:48:13","date_gmt":"2026-10-19T09:48:13","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-lyfjafraedi\/"},"modified":"2026-10-19T09:48:13","modified_gmt":"2026-10-19T09:48:13","slug":"doktorsvorn-i-lyfjafraedi","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-lyfjafraedi\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed lyfjafr\u00e6\u00f0i"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p>Maonian Xu ver doktorsritger\u00f0 s\u00edna \u00ed lyfjav\u00edsindum vi\u00f0 Lyfjafr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands. Ritger\u00f0in ber heiti\u00f0: <strong>\u00der\u00f3unars\u00f6gulegur og efnafr\u00e6\u00f0ilegur skyldleiki hj\u00e1 \u00edslenskum j\u00f6fnum og fjallagrasal\u00edkum tegundum \u00edslenskra fl\u00e9ttna. Phylogeny and phytochemistry of Icelandic cetrarioid lichens and club mosses.<\/strong><\/p>\n<p>Andm\u00e6lendur eru dr. Thomas Ostenfeld Larsen, pr\u00f3fessor vi\u00f0 Danmarks Tekniske Universitet \u2013 DTU, og\u00a0 dr. \u00d3lafur Andr\u00e9sson, pr\u00f3fessor vi\u00f0 L\u00edf- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n<p>Umsj\u00f3narkennari og a\u00f0allei\u00f0beinandi var dr. El\u00edn Soff\u00eda \u00d3lafsd\u00f3ttir, pr\u00f3fessor vi\u00f0 Lyfjafr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands, og lei\u00f0beinandi me\u00f0 henni var dr. Sesselja \u00d3marsd\u00f3ttir, pr\u00f3fessor vi\u00f0 s\u00f6mu deild. A\u00f0 auki s\u00e1tu \u00ed doktorsnefnd dr. Starri Hei\u00f0marsson, grasafr\u00e6\u00f0ingur vi\u00f0 N\u00e1tt\u00farufr\u00e6\u00f0istofnun \u00cdslands,\u00a0\u00a0 Margr\u00e9t \u00deorsteinsd\u00f3ttir, d\u00f3sent vi\u00f0 Lyfjafr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands,\u00a0 og Nina R\u00f8nsted, pr\u00f3fessor vi\u00f0 Botany\u00a0 Natural History Museum of Denmark og Kaupmannahafnarh\u00e1sk\u00f3la.<\/p>\n<p>Dr. H\u00e1kon Hrafn Sigur\u00f0sson, pr\u00f3fessor og forseti Lyfjafr\u00e6\u00f0ideildar H\u00e1sk\u00f3la \u00cdslands, stj\u00f3rnar ath\u00f6fninni.<\/p>\n<p>\u00a0\u00a0<\/p>\n<p><strong>\u00c1grip af ranns\u00f3kn<\/strong><\/p>\n<p>Pl\u00f6ntur, auk \u00fdmissa annarra l\u00edfvera, eru mikilv\u00e6g uppspretta n\u00fdrra efnabygginga til lyfja\u00fer\u00f3unar. Sum \u00feessara lyfjaefna hafa uppg\u00f6tvast vi\u00f0 ranns\u00f3knir \u00e1 hef\u00f0bundinni notkun planta \u00ed al\u00fe\u00fd\u00f0ul\u00e6kningum. Samanbur\u00f0ur \u00e1 n\u00fdtingu l\u00e6kningajurta \u00ed \u00f3l\u00edkum samf\u00e9l\u00f6gum hefur leitt \u00ed lj\u00f3s a\u00f0 \u00fe\u00e6r eru algengari \u00e1 \u00e1kve\u00f0num greinum \u00fer\u00f3unars\u00f6gutr\u00e9sins og s\u00fa \u00feekking g\u00e6ti au\u00f0velda\u00f0 leitina a\u00f0 n\u00fdjum lyfjaefnum \u00ed jurtum og gert hana markvissari. Cetraria islandica, e\u00f0a fjallagr\u00f6s, er fl\u00e9ttutegund sem er n\u00fdtt \u00ed hef\u00f0bundnum l\u00e6kningum til a\u00f0 me\u00f0h\u00f6ndla b\u00f3lgukvilla, s.s. \u00ed lungum og meltingarvegi. K\u00ednverski jafninn Huperzia serrata er nota\u00f0ur gegn Alzheimerssj\u00fakd\u00f3mi en Huperzia tegundir framlei\u00f0a l\u00edfvirka alkal\u00f3\u00ed\u00f0ann huperzine A.<\/p>\n<p>Markmi\u00f0 verkefnisins var a\u00f0 kanna tengsl \u00e1 milli \u00fer\u00f3unars\u00f6gulegs og efnafr\u00e6\u00f0ilegs skyldleika hj\u00e1 j\u00f6fnum og fjallagrasal\u00edkum fl\u00e9ttum \u00e1 \u00cdslandi. DNA strikamerking og \u00fer\u00f3unars\u00f6gulegar greiningar voru n\u00fdttar til a\u00f0 afhj\u00fapa innbyr\u00f0is skyldleika tegundanna og umbrotsefnasamsetning var greind me\u00f0 UPLC-ESI-QToF-massagreiningu.<\/p>\n<p>Markt\u00e6k tengsl milli \u00fer\u00f3unars\u00f6guskyldleika og umbrotsefnasamsetningar fundust \u00ed fjallagr\u00f6sum og skyldum Cetraria tegundum \u00fear sem paraconics\u00fdrur eru helstu fl\u00e9ttus\u00fdrurnar. PCA fj\u00f6lbreytugreining \u00e1 umbrotsefnasamsetningu a\u00f0greindi \u00f3l\u00edkar fl\u00e9ttutegundir, nema hva\u00f0 paraconics\u00fdruframlei\u00f0endur myndu\u00f0u \u00f3uppleyst hneppi. OPLS-DA greining leiddi \u00ed lj\u00f3s breytur sem eru markt\u00e6kar vi\u00f0 a\u00f0greiningu s\u00fdna. \u00cd fl\u00e9ttutegundinni Cetrariella delisei fundust tv\u00e6r n\u00fdjar tegundir Trebouxia \u00fe\u00f6rungs. \u00der\u00f3unars\u00f6gugreiningar \u00e1 \u00edslenskum j\u00f6fnum \u00ed al\u00fej\u00f3\u00f0legu samhengi s\u00fdndu tilvist ein\u00e6tta \u00e6ttkv\u00edsla og undir\u00e6tta en greindi ekki allar tegundir af \u00e6ttkv\u00edslinni Huperzia. Magn huperzine A var \u00e1kvar\u00f0a\u00f0 \u00ed Huperzia selago og fannst meira magn \u00ed \u00fatlitsafbrig\u00f0i me\u00f0 \u00fatst\u00e6\u00f0 bl\u00f6\u00f0. Samkeyrsla \u00fer\u00f3unars\u00f6gulegs og efnafr\u00e6\u00f0ilegs skyldleika \u00ed \u00feessu verkefni bendir til gagnsemi \u00feess vi\u00f0 leit a\u00f0 lyfjafr\u00e6\u00f0ilega \u00e1hugaver\u00f0um tegundum e\u00f0a afbrig\u00f0um me\u00f0al fl\u00e9tta og jafna.<\/p>\n<p>\u00a0\u00a0<\/p>\n<p><strong><\/strong><\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Maonian Xu lauk BS-gr\u00e1\u00f0u \u00ed matv\u00e6lafr\u00e6\u00f0i fr\u00e1 Northwest Agriculture &amp; Forestry University \u00ed K\u00edna \u00e1ri\u00f0 2010 og MS-gr\u00e1\u00f0u \u00ed matv\u00e6lafr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3lanum \u00ed Helsinki \u00feremur \u00e1rum s\u00ed\u00f0ar. Maonian, sem er kv\u00e6ntur Yuetuan Zhang doktorsnema, h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2014.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1092,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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":"","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":""}},"_phd_date_start":"2017-11-21T13:00:00+00:00","_phd_date_end":"2017-11-21T16:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0asal","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"\u00der\u00f3unars\u00f6gulegur og efnafr\u00e6\u00f0ilegur skyldleiki hj\u00e1 \u00edslenskum j\u00f6fnum og fjallagrasal\u00edkum tegundum \u00edslenskra fl\u00e9ttna. Phylogeny and phytochemistry of Icelandic cetrarioid lichens and club mosses","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_lyfjafraedi","_phd_source_node_id":"309080","_phd_source_type":"vidburdir","_phd_member_id":99,"footnotes":""},"phd_school":[60,64],"phd_discipline":[65],"class_list":["post-5953","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-heilbrigdisvisindasvid","phd_school-lyfjafraedideild","phd_discipline-phd-i-lyfjavisindum"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/5953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/5953\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/1092"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=5953"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=5953"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=5953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}