{"id":6013,"date":"2026-10-19T09:48:22","date_gmt":"2026-10-19T09:48:22","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-matvaelafraedi-magdalena-stefaniak-vidarsson\/"},"modified":"2026-10-19T09:48:22","modified_gmt":"2026-10-19T09:48:22","slug":"doktorsvorn-i-matvaelafraedi-magdalena-stefaniak-vidarsson","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-matvaelafraedi-magdalena-stefaniak-vidarsson\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed matv\u00e6lafr\u00e6\u00f0i – Magdalena Stefaniak Vi\u00f0arsson"},"content":{"rendered":"
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Mi\u00f0vikudaginn 6. desember n\u00e6stkomandi ver Magdalena Stefaniak Vi\u00f0arsson doktorsritger\u00f0 s\u00edna \u00ed matv\u00e6lafr\u00e6\u00f0i vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands. Ritger\u00f0in ber heiti\u00f0: Mat \u00e1 l\u00edfvirkni fj\u00f6lsykru\u00fatdr\u00e1tta af sj\u00e1varuppruna. Evaluation of bioactive properties of marine-derived polysaccharide extracts.<\/strong><\/p>\n

Andm\u00e6lendur eru dr. Maher Abou Hachem, d\u00f3sent vi\u00f0 Danmarks Tekniske Universitet – DTU, og dr. Berglind Eva Benediktsd\u00f3ttir, d\u00f3sent vi\u00f0 Lyfjafr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

\u00cd doktorsnefnd Magdalenu s\u00e1tu dr. Mar\u00eda Gu\u00f0j\u00f3nsd\u00f3ttir, d\u00f3sent \u00ed Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild, dr. \u00d3lafur Eysteinn Sigurj\u00f3nsson, kl\u00edn\u00edskur pr\u00f3fessor vi\u00f0 L\u00e6knadeild, dr. Kristberg Kristbergsson, pr\u00f3fessor vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild, og dr. Sesselja \u00d3marsd\u00f3ttir, pr\u00f3fessor vi\u00f0 Lyfjafr\u00e6\u00f0ideild.<\/p>\n

Gu\u00f0j\u00f3n \u00deorkelsson, pr\u00f3fessor vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands, stj\u00f3rnar ath\u00f6fninni sem fram fer \u00ed H\u00e1t\u00ed\u00f0asal H\u00e1sk\u00f3la \u00cdslands og hefst kl. 9:30.<\/p>\n

\u00c1grip af ranns\u00f3kn<\/strong><\/p>\n

Kolvetni skipa meginsess \u00ed l\u00edfefni sj\u00e1var. Fj\u00f6lsykrur eru me\u00f0al mikilv\u00e6gustu byggingasteina \u00fdmissa sj\u00e1varl\u00edfvera, svo sem \u00feangi og \u00feara, auk nokkurra hryggleysingja (s\u00e6bj\u00fagu og \u00edgulker). Fj\u00f6lsykrur sem upprunnar eru \u00far hafinu hafa veri\u00f0 nota\u00f0ar \u00ed \u00fdmsum tilgangi, s.s. vi\u00f0 matarger\u00f0, til n\u00e6ringarefnager\u00f0ar og lyfjager\u00f0ar. \u00der\u00e1tt fyrir miklar framfarir \u00ed ranns\u00f3knum \u00e1 sj\u00e1vartengdum fj\u00f6lsykrum er m\u00f6rgum spurningum enn \u00f3svara\u00f0 hva\u00f0 var\u00f0ar l\u00edffr\u00e6\u00f0ilega eiginleika \u00feeirra.<\/p>\n

Tilgangur verkefnisins var a\u00f0 rannsaka fj\u00f6lsykrur af sj\u00e1varuppruna og afla frekari uppl\u00fdsinga og \u00feekkingar \u00e1 eiginleikum \u00feeirra, me\u00f0 \u00e1herslu \u00e1 hugsanlega eiginleika \u00feeirra til \u00f3n\u00e6misst\u00fdringar.<\/p>\n

\u00datdr\u00e6ttirnir sem voru til ranns\u00f3knar voru fengnir \u00far sj\u00e1varl\u00edfverum s.s. br\u00fan\u00fe\u00f6rungum (Saccharina latissima, Laminaria digitata og Laminaria hyperborea), \u00e1samt rau\u00f0f\u00f3ta s\u00e6bj\u00fagum (Cucumaria frondosa). \u00datdr\u00e6ttirnir voru fengnir me\u00f0 \u00fdmsum \u00fatdr\u00e1ttara\u00f0fer\u00f0um (vatns-, etan\u00f3ls- og ens\u00edm\u00fatdr\u00e6tti) sem leiddi til afur\u00f0a me\u00f0 mikinn breytileika \u00ed b\u00e6\u00f0i efnasamsetningu og l\u00edfvirkni.<\/p>\n

Hef\u00f0bundnar efnam\u00e6lingar voru nota\u00f0ar til a\u00f0 m\u00e6la fj\u00f6lfen\u00f3l og fj\u00f6lsykrusamsetningu, en einnig voru andoxandi eiginleikar \u00fatdr\u00e1ttanna metnir me\u00f0 svokalla\u00f0ri \u201eoxygen radical absorbance capacity\u201c (ORAC) a\u00f0fer\u00f0. \u00dear a\u00f0 auki voru eiturefna\u00e1hrif efnanna ranns\u00f6ku\u00f0 til a\u00f0 meta \u00f6ryggi \u00fatdr\u00e1ttanna gagnvart THP-1-m\u00f3n\u00f3s\u00fdtum.<\/p>\n

\u00datdr\u00e6ttirnir \u00far \u00fearanum og s\u00e6bj\u00fagunum juku losun b\u00f3lgumyndandi (TNF-a and IL-6), og b\u00f3lguhamlandi (IL-10) frumubo\u00f0a, sem getur gefi\u00f0 \u00ed skyn\u00a0 a\u00f0 efnin megi nota \u00ed \u00f3n\u00e6misst\u00fdrandi tilgangi. \u00d3n\u00e6misst\u00fdrandi eiginleikar efnanna eru \u00fe\u00f3 sterklega h\u00e1\u00f0ir fj\u00f6lsykrusamsetningu og fj\u00f6lfen\u00f3l samsetningu \u00feeirra, \u00e1samt andoxandi eiginleikum \u00feeirra.<\/p>\n

Greiningar \u00e1 efnasamsetningu efnanna samhli\u00f0a frumupr\u00f3funum tengir saman fj\u00f6lda v\u00edsindagreina, s.s. matv\u00e6lafr\u00e6\u00f0i, n\u00e6ringarfr\u00e6\u00f0i, l\u00edft\u00e6kni og \u00f3n\u00e6misfr\u00e6\u00f0i, og veitir \u00fev\u00ed yfirgripsmeiri \u00feekkingu en \u00e1\u00f0ur \u00e1 \u00feeim efnum sem finna m\u00e1 \u00ed f\u00e6\u00f0u manna og hva\u00f0a \u00e1hrif \u00feau hafa \u00e1 l\u00edkamann.<\/p>\n

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

Magdalena \u00fatskrifa\u00f0ist me\u00f0 meistarapr\u00f3f \u00ed Medical biotechnology \u00e1ri\u00f0 2004 fr\u00e1 University of Wroclaw \u00ed P\u00f3llandi. Magdalena h\u00f3f st\u00f6rf hj\u00e1 DeCode genetics sem v\u00edsindama\u00f0ur (research associate) \u00e1ri\u00f0 2006 vi\u00f0 genotype-deild fyrirt\u00e6kisins. Vi\u00f0 t\u00f3ku ranns\u00f3knir og s\u00ed\u00f0ar doktorssta\u00f0a vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands, en samhli\u00f0a \u00fev\u00ed vann h\u00fan einnig a\u00f0 verkefnum hj\u00e1 Mat\u00eds og TaraMar til skemmri t\u00edma. Meirihluti doktorsverkefnisins er \u00fe\u00f3 unninn vi\u00f0 Bl\u00f3\u00f0bankann \u00ed Reykjav\u00edk. Magdalena hefur n\u00fdlega veri\u00f0 r\u00e1\u00f0in til starfa vi\u00f0 \u00f3n\u00e6misfr\u00e6\u00f0ideild Landsp\u00edtalans og mun h\u00fan hefja st\u00f6rf \u00fear flj\u00f3tlega eftir \u00fatskrift. Magdalena er gift Helga Vi\u00f0arssyni og eiga \u00feau d\u00f3tturina El\u00ednu Mar\u00edu, sem er f\u00e6dd 2011.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1249,"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":"2017-12-06T09:30:00+00:00","_phd_date_end":"2017-12-06T11:30:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0asalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Mat \u00e1 l\u00edfvirkni fj\u00f6lsykru\u00fatdr\u00e1tta af sj\u00e1varuppruna. 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