Verkefni/Projects

• Líf-eldsneyti
• Pan-Thermus-aðskilnaður tegunda

RITASKRÁ / Publications

Rannsóknarritgerðir / Theses

Guðmundur Ó. Hreggviðsson 1993. Cytochromes c and the evolution of Gram positive bacteria. Ph.D. Thesis, Háskólinn í Edinburgh. 301 bls.

Guðmundur Óli Hreggviðsson. 1986. Framköllun fasabreytinga og leit að glycine og proline tRNA byrgjum í E. coli. 4.árs rannsóknarritgerð við Háskóla Íslands, 109 bls.

RITRÝNDAR GREINAR / Peer-reviewed articles:

2010:

Tao Wang, Rósa Jónsdóttir, Hördur G. Kristinsson, Guðmundur Óli Hreggviðsson, Jón Óskar Jónsson, Guðrún Ólafsdóttir. 2010. Enzyme-enhanced extraction of antioxidant ingredients from the red algae Palmaria palmata. LWT – Food Science and Technology. 43(9), 1387-1393. Grein / Article

Meike Stelter, Ana M. P. Melo, Gudmundur O. Hreggvidsson, Sigridur Hjorleifsdottir, Lígia M. Saraiva, Miguel Teixeira, Margarida Archer. 2010. Structure at 1.0 Å resolution of a HiPIP involved in the aerobic respiratory chain of Rhodothermus marinus. JBIC Journal of Biological Inorganic Chemistry, 15 (3) 303-313.  Grein / Article

Kristinn Olafsson, Sigridur Hjorleifsdottir, Christophe Pampoulie, Gudmundur Oli Hreggvidsson, Sigurdur Gudjonsson. 2010. Novel set of multiplex assays (SalPrint15) for efficient analysis of 15 microsatellite loci in the Atlantic salmon (Salmo salar). Molecular Ecology Resources, 10, 533–537. Grein / Article

S. Skirnisdottir, K. Olafsson, S. Hauksdottir, C. Pampoulie, G. O. Hreggvidsson, G.H. Gunnarsson, and S. Hjorleifsdottir. Isolation and characterization of eight new microsatellite loci in the Norway lobster, Nephrops norvegicus (Linnaeus, 1758). Molecular Ecology Resources. Accepted for publication.

2009:

Petursdottir, Solveig K. ; Bjornsdottir, Snaedis H.; Hreggvidsson, Gudmundur O.; Hjorleifsdottir, Sigridur ; Kristjansson, Jakob K. 2009. Analysis of the unique geothermal microbial ecosystem of  the Blue Lagoon. FEMS Microbiolgy Ecology. 70(3) 93-100.Grein / Article

Eyjólfur Reynisson, Hélène Liette Lauzon, Hannes Magnússon, Rósa Jónsdóttir, Guðrún Ólafsdottir, Viggo Þór Marteinsson, Guðmundur Óli Hreggviðsson. 2009. Bacterial composition and succession during storage of North-Atlantic cod (Gadus morhua) at superchilled temperatures. BMC Microbiology. 9(1) 250. Grein / Article

Snaedis H. Bjornsdottir, Solveig K. Petursdottir, Gudmundur O. Hreggvidsson, Sigurlaug Skirnisdottir, Sigridur Hjorleifsdottir, Johann Arnfinnsson, and Jakob K. Kristjansson. 2009. Thermus islandicus sp. nov., a mixotrophic, sulfur-oxidizing bacterium isolated from the Torfajokull geothermal area. International Journal of Systematic and Evolutionary Microbiology.59 (12) 2962-2966. Grein / Article

Bryndis Bjornsdottir, Ólafur H. Friðjónsson, Steinunn Magnúsdóttir, Valgerður Andrésdóttir, Guðmundur Ó. Hreggviðsson, and Bjarnheiður K. Guðmundsdóttir. 2009. Characterization of an Extracellular Vibriolysin of the Fish Pathogen Moritella viscose. Veterinary Microbiology. 136 (3-4) 326-334. Grein / Article

Eyjólfur Reynisson, Birna Guðbjornsdottir, Viggo Þór Marteinsson and Guðmundur Óli Hreggviðsson 2009. Decontamination Efficiency of Fish Bacterial Flora from Processing Surfaces. Food Technology and Biotechnology. 47 (1) 75-82. Grein / Article.

2008:

Eva Nordberg Karlsson, Antje Labes, Pernilla Turner, Olafur H. Fridjonsson,Christina Wennerberg, Tania Pozzo, Gudmundur O. Hreggvidson, Jakob K. Kristjansson and Peter Schönheit. 2008 Differences and similarities in enzymes from the neopullulanase subfamily isolated from thermophilic species. Biologia 63 (6):1006—1014 Grein / Article

Eyjólfur Reynisson, Hélène Liette Lauzon, Hannes Magnússon, Guðmundur Óli Hreggviðsson, Viggó Þór Marteinsson. 2008. Rapid quantitative monitoring method for the fish spoilage bacteria Pseudomonas. Journal of Environmental Monitoring 10: 1357-1362 Grein / Article

Kochzius, M., Nölte, M., Weber, H., Silkenbeumer, N., Sigríður Hjörleifsdottir, Guðmundur Óli Hreggvidsson, Viggó Marteinsson, Kappel, K., Planes, S., Tinti, F., Magoulas, A., Garcia Vazquez, E., Turan, C., Hervet, C., Campo Falgueras, D., Antoniou, A., Landi, M. and Blohm, D. (2008) DNA Microarrays for Identifying Fishes. Marine Biotechnology 10 (2), 207-217. Grein / Article

Antje Labes, Eva Nordberg Karlsson, Olafur H. Fridjonsson, Pernilla Turner, Gudmundur O. Hreggvidson, Jakob K. Kristjansson, Olle Holst, and Peter Schönheit. 2008. Novel members of glycoside hydrolase family 13 derived from environmental DNA. Applied and Environmental Microbiology 74 (2): 1914-1921. Grein / Article

Sigurlaug Skírnisdóttir,Christophe Pampoulie, Sigurbjörg Hauksdóttir, Inga Schulte, Kristinn Ólafsson,Guðmundur Ó. Hreggviðsson, Sigríður Hjörleifsdóttir. 2008. Characterization of 18 new microsatellite loci in Atlantic cod (Gadus morhua L.) Molecular Ecology Resources, 8 (6), 1503-1505. Grein / Article

Cédric F.V. Hobel, Viggó T. Marteinsson, Gudmundur Ó. Hreggvidsson and Jakob K. Kristjánsson. 2008. Microbial diversity of the Grimsey high-temperature vent Field on the subpolar Mid-Atlantic Ridge. Extremophiles. (Submitted)

2007:

Manuela M. Pereira, Patricia N. Refojo, Gudmundur O. Hreggvidsson, Sigridur Hjorleifsdottir and Miguel Teixeira. 2007. The alternative complex III from Rhodothermus marinus – a prototype of a new family of quinol: electron acceptor oxidoreductases. Biochemistry. FEBS Letters, 581 (25), 4831-4835. Grein / Article

Verissimo, A., Pereira, M., Melo, A., Hreggvidsson, GO., Texeira, M. And Kristjansson, JK. 2007. A ba3 oxygen reductase from the thermohalophilic bacterium Rhodothermus marinus. FEMS Microbiology Letters, 269:41-47.  Grein / Article

Hákon Birgisson, Jon Oskar Wheat, Gudmundur O Hreggvidsson, Jakob K Kristjansson and Bo Mattiasson. 2007. Immobilization of a recombinant Escherichia coli producing a thermostable alpha-L-rhamnosidase; creation of a bioreactor for hydrolyses of naringen" Enzyme and Microbial Technology. 40:1181-1187. Grein / Article

Carla Jorge, Maria Sampaio, Gudmundur Hreggvidsson, Jakob Kristjánson, 2007. A highly thermostable trehalase from the thermophilic bacterium Rhodothermus marinus. Extremophiles. 11:116-122. Grein / Article

2006:

Gudmundur O. Hreggvidsson, Sigurlaug Skirnisdottir, Bart Smit, Sigridur Hjorleifsdottir Viggo T. Marteinsson, Solveig Petursdottir and Jakob K. Kristjansson. 2006. Polyphasic analysis of Thermus isolates from geothermal areas in Iceland. Extremophiles, 10 (6) pp 563-575. Grein / Article

Klara Björg Jakosdóttir, Þóra Dögg Jörundsdóttir, Sigurlaug Skírnisdóttir, Sigrídur Hjörleifsdóttir, Guðmundur Ó. Hreggviðsson, Anna Kristín Daníelsdóttir & Christophe Pampoulie. 2006. Nine polymorphic microsatellite loci for the amplification of archived otolith DNA of Atlantic cod, Gadus morhua. Molecular Ecology Notes. 6: 337–339.

Snaedis H. Bjornsdottir, Thorarinn Blöndal, Gudmundur Hreggvidsson, Gudmundur Eggertsson, Solveig Petursdottir, Sigridur Hjorleifsdottir, Sigridur Thorbjarnardottir, Jakob K. Kristjansson, 2006. Rhodothermus marinus Physiology and Molecular Biology. Extremophiles. 10:1-16. Grein / Article

2005:

Ana M. P. Melo, Susana A. L. Lobo, Filipa L. Sousa, Andreia S. Fernandes, Manuela M. Pereira, Gudmundur O. Hreggvidsson, Jakob K. Kristjansson, Lígia M. Saraiva, and Miguel Teixeira. 2005. A nhaD Na+/H+ antiporter and a pcd homologues are among the Rhodothermus marinus complex I genes. BBA Bioenergetics. 96:95-103.

Turner, P., Labes, A., Fridjonsson, O.H., Hreggvidsson, G.O.H., Schönheit, P., Kristjansson, J.K., Holst, O., and Nordberg-Karlsson, E. 2005. Two novel cyclodextrin-degrading enzymes isolated from thermophilic bacteria have similar domain structures but differ in oligomeric state and activitiy profile. Journal of Bioscience and Bioengineering, 4:380-390.

Hobel, C.F.V., Marteinsson, V.T., Hreggvidsson G.O. and Kristjansson J.K. 2005. Investigation of the microbial ecology of intertidal hot springs by using diversity anlysis of 16S rRNA and chitinase genes. Applied and Evironmental Microbiology 71(5) : 2771-2776 Grein / Article

Blondal, Th., Hjorleifsdottir, S., Fridjonsson,OF., Ævarsson, A., Skirnisdottir, S.,  Hermannsdottir, AG.,  Hreggvidsson, GO., Smith AV.,   and Kristjansson, JK.  2005. Discovery and Characterization of a novel 5' polynucleotide kinase – 3' phosphatase from the RM378 bacteriophage. – Evidence for domain shuffling.  Journal of Biological Chemistry. 280(7):5188-94.

Blondal, Th., Thorisdottir A., Unnsteinsdottir U., Hjorleifsdottir, S., Ævarsson, A., Fridjonsson, OH., Skirnisdottir,  S., Wheat, JO., Hermannsdottir, AG., Sigurdsson, S.Th., Hreggvidsson, GO., Smith AV., and Kristjansson, JK. 2005. Isolation and characterization of a thermostable RNA ligase 1 from a Thermus scotoductus bacteriophage TS2126 with good single-stranded DNA ligation properties.  Nucleic Acid Research. 33:135-142.

Cedric F. V. Hobel , Gudmundur O. Hreggvidsson, Viggo T. Marteinsson, Farah Bahrani-Mougeot, Jon M. Einarsson,and Jakob K.Kristjansson 2005. Cloning, expression, and characterization of a highly thermostable family 18 chitinase from Rhodothermus marinus. Extremophilies. 9(1):53-64. Grein / Article

Hobel, C.F.V., Marteinsson, V.T., Hreggvidsson G.O. and Kristjansson J.K. 2005. Investigation of the microbial ecology of intertidal hot springs by using diversity anlysis of 16S rRNA and chitinase genes. Applied and Evironmental Microbiology 71(5) : 2771-2776  Grein / Article

2004:

Birgisson. H., Fridjonsson, O., Bahrani-Mougeot, F.K., Hreggvidsson, G.O. Kristjansson, J.K. and Mattiasson, B. 2004. A new thermostable a-L-arabinofuranosidase from a novel thermophilic bacterium. Biotechnology Letters 26: 1347-1351.

Nordberg Karlsson, Eva, Abou Hachem, Maher; Ramchuran, Santosh;  Costa, Hugo; Holst, Olle; Fex Svenningsen, Åsa; Hreggvidsson, Gudmundur. 2004. The modular xylanase Xyn10A from Rhodothermus marinus is cell-attached, and its C-terminal domain has several putative homologues among cell-attached proteins within the phylum   Bacteroidetes. FEMS Microbiology Letters. 241:233-42.

Hobel, CFV., Marteinsson, VT., S Hauksdóttir, S., Fridjónsson, OH., Skírnisdóttir, S., Hreggvidsson, GÓ.,  and Kristjánsson, JK., 2004. Accessing novel amylase genes in silent thermophile diversity by low nutrient enrichments.  World Journal of Microbiology and Biotechnology, 20:801-809. Grein / Article

Hákon Birgisson, Guðmundur Ó Hreggviðsson, Ólafur H Friðjónsson, Jakob K Kristjánsson and Bo Mattiasson. 2004. Two new thermostable  alpha-L-rhamnosidases from a novel thermophilic bacterium.  Enz.Microb.Technol. 34, 561-571.

2003:

Abou-Hachem, F. Olsson, M.P. Williamson, S. Linse, S.J. Crennell, G.O. Hreggvidsson, O. Holst, and E. Nordberg Karlsson. 2003. The modular organisation and stability of a thermostable family 10 xylanase. Biocatlysis and Biotransformation. 21:253-260.

Thorarinn Blondal, Sigridur H. Hjorleifsdottir, Olafur F. Fridjonsson, Arnthor Ævarsson, Sigurlaug Skirnisdottir, Anna Gudny Hermannsdottir, Gudmundur O. Hreggvidsson, Albert Vernon Smith, and Jakob K. Kristjansson. 2003. Discovery and characterization of a thermostable bacteriophage RNA ligase homologous to T4 RNA ligase 1. Nucleic Acids Research, 2003 31: 7247-7254.

2002:

Crennell, SJ., Hreggvidsson, GO. and  Nordberg-Karlsson, E. 2002. The structure of Rhodothermus marinus Cel12A, a highly thermostable family 12 endonuclease, at 1.8 A Resolution. Journal of Molecular Biology, 320:883-897.

2001:

Marteinsson, VT., Hauksdóttir, S., Hobel., CF., Kristmannsdóttir, H., Hreggvidsson, GO., Kristjansson, JK . 2001. Phylogentic diversity analysis of subterranean hot springs in Iceland. Applied and Environmental Microbiology, l 67:4242-4248. Grein / Article

Wicher, KB., Abou-Hachem, M., Halldorsdottir, S., Thorbjarnardottir, SH., Eggertsson, G., Hreggvidsson, GO., Nordberg-Karlsson, E., Holst, O.  2001 Deletion of a cytotoxic, N-terminal putative signal peptide results in a significant increase in production yields in Escherichia coli and improved specific activity of Cel12A from Rhodothermus marinus. Applied  Microbiology and Biotechnology, 55:578-584.

Irwin, A.J., Gudmundsson, H.M, Marteinsson, V.Th., Hreggvidsson, G.O., Lanzetti, A.J;. Alfredsson, G.A. and Engel, P.C.  2001. Characterisation of alanine andmalate dehydrogenases from a marine psycrophilic strain PA-43. Extremophiles, 5:199-211.

Skirnisdottir, S. Hreggvidsson, G.O. Holst, O. and Kristjansson, J.K. 2001. A new ecological adaptatin to high sulfide by a Hydrogeonbacter sp. growing on sulfur compounds, but not on hydrogen. Microbiological Research, 156:41-47

Skirnisdottir, S. Hreggvidsson, G.O. Holst, O. and Kristjansson, J.K . 2001. Isolation and characterization of  a mixotrophic sulfur oxidizing  Thermus scotoductus. Extremophiles, 5:45-51.

Hjorleifsdottir, S., Skirnisdottir, S., Hreggvidsson, G.O., Holst, O.  and Kristjansson, J.K . 2001. Species composition  of cultivated and non-cultivated bacteria from short filaments in a Icelandic hot spring at 88°C. Microbiology and.Ecology, 42:117-125.

2000:

Skirnisdottir, S, Hreggvidsson, G.O., Hjorleifsdottir, S. Marteinsson, V.Th., Petursdottir, S.K., Holst, O. and Kristjansson, J.K . 2000. Influence of sulfide and temperature on species composition and community structure of hot spring microbial mats. Applied and Environmental Microbiology, 66: 2835-2841.  Lesa grein

Petursdottir, K.S., Hreggvidsson, G.O., Da Costa, M.S. and Kristjansson, J.K . 2000. Genetic diversity analysis of Rhodothermus marinus reflects geographical origin of the isoalates. Extremeophiles, 4:267-274. DOI Grein / Article

1986 - 1997:

Halldorsdottir, S., Thorolfsdottir, E.Th., Spilliaert, R., Thorbjarnardottir, S., Palsdottir, A., Hreggvidsson, G.O., Johannesson, M., Holst, O.,  Kristjansson, J.K. and Eggertsson, G. 1997. Cloning and overexpression of a Rhodothermus marinus gene encoding cellulase of glycosyl family 13. Appl. Microbiol. Biotechnol. 49:277-284.

Radax,C., Sigurdsson,O., Hreggvidsson,G.O., Aichinger, N., Gruber,C., Kristjansson, J.K. and Stan-Lotter,H., 1997. F and V-ATPases in the genus Thermus and related species. System. Appl. Microbiol 21:12-22.

Manelius, Åsa., Holst, O., Hreggvidsson, G.O., Kristjansson, J.K., Raven, N., andSharp., R., 1996. Continuous cultivation of Hydrogenobacter thermophilus at low partial pressures of hydrogen. Biotechnology techniques. 11:177-181.

Hreggvidsson, G.O. Kaiste, E., Holst, O., Eggertsson, G., Palsdottir, A., and Kristjansson, J.K. 1996. An extremely thermostable cellulase from the thermophilic eubacterium Rhodothermus marinus.   Appl. Environ. Microbiol. 62:3047-3049.

Hreggviðsson, G.Ó., Gustavsson, Th., Holst, O., Kronsbein, K.,  Hjörleifsdóttir, S., Skjenstad, T.  and Kristjansson, J.K. 1995. Large scale cultivation of Hydrogenobacter thermophilus grown on hydrogen. Lett. Appl. Microbiol. 21:277-281.

Jakob K. Kristjansson and Gudmundur O. Hreggvidsson. 1994. Ecology and habitats of extremophiles. World. J. Microbiol. Biotechnol. 11:17-25

Spillaert, R. Hreggvidsson, G.O., Kristjansson, J.K., Eggertsson, G. and Palsdottir, 1994. Cloning and sequencing of a Rhodothermus marinus gene, bglA, coding for a thermostable b-glucanase in Eschericha coli.. Eur. J. Biochem. 224:923-930.

Guðmundur Óli Hreggviðsson. 1991.  Two structurally different cytochromes c from Bacillus azotoformans, on the evolution of Gram-positive bacteria. Biochim. Biophys. Acta. 1058:52-55.

Kristjánsson, J.K,  G.Ó. Hreggviðsson and G. Alfreðsson. 1986. Isolation of halotolerant Thermus spp. from submarine hot springs in Iceland.Appl. Environ. Microbiol. 52: 1313-1316.

SKÝRSLUR / REPORTS

2010:

Guðmundur Óli Hreggviðsson, Ólafur H. Friðjónsson, Þorleifur Ágústsson, Sigríður Hjörleifsdóttir, Kjell Hellman, Filipe Figueiredo, Helgi Thorarensen. Photoperiod and genetics of growth and maturity in cod (Gadus morhua). Skýrsla Matís 13-10, 43 s. Lokuð skýrsla. Skýrsluágrip.

EINKALEYFI

2002-2007:

Ævarsson, A., T. Blondal, O.H. Fridjonsson, S. Skirnisdottir, S. Hjörleifsdóttir, G.O. Hreggvidsson & J.K. Kristjansson 2007: Methods of Use for Thermostable RNA Ligases European patent no. 1546355. Evrópskt patent. no. 1546355. Útgefið 21 nóvember 2007.

Hjorleifsdottir, Sigridur; Hreggvidsson, Gudmundur O.; Fridjonsson, Olafur H.; Aevarsson, Arnthor; Kristjansson,; Jakob K. 2004. RNA ligase of bacteriophage RM 378 US Patent No: 6,818,425. Útgefið 16 Nóv 2004.

Wicher; KB., Holst; Olof P., Hachem; MYA., Nordberg-Karlsson; EM., Hreggvidsson; GO, Thermostable cellulase. US Patent No 6,812,018. Útgefið 2. Nov. 2004.

Sigríður Hjörleifsdottir, Gudmundur O. Hreggvidsson, Olafur H. Fridjonsson, Arnthor Aevarsson and Jakob K. Kristjanssson. 2003. Bacteriophage RM 378 of a thermophilic host organism. US Patent No: 6,492,161. Útgefið 10 Des 2002.

Bókarkaflar / Chapters in reviewed books

2000 - 2003:

Gudmundur O. Hreggvidsson and Jakob K. Kristjansson Thermophily. 2003. Chapter in: Extremophiles– Encylopedia of Life Support Systems: UNESCO

Jakob K. Kristjansson Gudmundur O. Hreggvidsson and William D. Grant. 2000. Taxonomy of Extremophiles. Chapter in: “Applied Microbial Systematics” (Eds. Fergus G. Priest and Michael Goodfellow). Chapman & Hall, London.

Ráðstefnur / Proceedings

2009:

Tao Wang, Rósa Jónsdóttir, Hordur G. Kristinsson, Gudjon Þorkelsson, Charlotte Jacobsen, Guðmundur Óli Hreggviðsson and Guðrún Ólafsdóttir. 2009. Algal polyphenols as novel natural antioxidantsrway. Erindi á ráðstefnunni 3rd Joint Trans-Atlantic Fisheries Technology Conference, TAFT 2009. Sept. 15 – 18. Copenhagen, Denmark. Abstract

2005 - 2007:

Marc Kochzius, Kristina Kappel, Lutz Döbitz, Nina Silkenbeumer, Manfred Nölte, Hannes Weber, Sigridur Hjörleifsdottir, Viggo Marteinsson, Gudmundur Hreggvidsson, Serge Planes, Fausto Tinti, Antonios Magoulas, Eva Garcia Vazquez, Cemal Turan, Linda Medlin, Katja Metfies, Christine Gescher, Alessia Cariani, Monica Landi, Caroline Hervet, Daniel Campo     Falgueras, Aglaia Antoniou, Fabio Bertasi, Chitipothu Srujana, Dietmar Blohm.  2007. The “Fish & Chips” project: Microarrays as a tool for the identification of marine organisms in biodiversity and ecosystem research.  Oceans '07 conference proceedings.

Emma Eyþórsdóttir, Sigurður Þór Guðmundsson og Sigvaldi Jónsson, Sigríður Hjörleifsdóttir og Guðmundur Óli Hreggviðsson. 2005.  Arfgerðir príongens (PrP) í fjárhjörðinni á Hesti.  Ráðstefnurit Fræðaþings Landbúnaðarins

Veggspjöld

Tao Wang, Rósa Jónsdóttir, Hordur G. Kristinsson, Guðmundur Óli Hreggviðsson, Jón Óskar Jónsson, Guðrún Ólafsdóttir. 2009. Evaluation of antioxidant activity of enzymatic extracts from the red algae Palmaria palmata. Poster at the IFT annual meeting. Anaheim, CA, June 2009.

Guðrún Ólafsdóttir, Tao Wang, Rósa Jónsdóttir, Hörður Kristinsson, Guðmundur Óli Hreggviðsson, Guðjón Þorkelsson. Palmaria palmata in food formulations as natural antioxidant and functional ingredient. Poster at the Innovation in the Nordic Marine Sector, Reykjavik, May 12th 2009.

2008:

E. Reynisson, H.L. Lauzon, H. Magnússon, G.Ó. Hreggvidsson, V.T. Marteinsson. 2008.Rapid quantification of the specific spoilage organism Pseudomonas spp in fish using real-time PCR. Veggspjald á Cold Chain Management ráðstefnu, 3^rd International Workshop í Bonn, 2.-3. júní 2008