Ragnar Jóhannsson

2022

Fjóla Rut Svavarsdóttir , Leó Alexander Guðmundsson , Ingi Rúnar Jónsson , Sigurður Már Einarsson , Guðni Guðbergsson , Ragnar Jóhannsson , Hlynur Bárðarson . Samantekt vöktunar vegna áhrifa sjókvíaeldis á íslenska laxastofna 2021. HV 2022-18. Haf- og vatnarannsóknir. 2022.

2021

Tómas Árnason , Theódór Kristjánsson , Ragnar Jóhannsson . Kynþroski í Bleikjueldi. HV 2021-16. Haf- og vatnarannsóknir. 2021.

2019

Stephen Knobloch, Ragnar Jóhannsson , Viggó Þór Marteinsson. Genome analysis of sponge symbiont “ Candidatus Halichondribacter symbioticus” shows genomic adaptation to a host‐dependent lifestyle. Environmental Microbiology. 2019;22. https://doi.org/10.1111/1462-2920.14869

Stephen Knobloch, Ragnar Jóhannsson , Viggó Marteinsson. Co-cultivation of the marine sponge Halichondria panicea and its associated microorganisms. Scientific Reports . 2019;9:10403. https://doi.org/10.1038/s41598-019-46904-3

Ian R. Bradbury, Steve Duffy, Sarah J. Lehnert, Ragnar Jóhannsson , Jon Hlodver Fridriksson, Marco Castellani, Ingrid Burgetz, Emma Sylvester, Amber Messmer, Kara Layton, Nicholas Kelly, J. Brian Dempson, Ian A. Fleming. Model-based evaluation of the genetic impacts of farm-escaped Atlantic salmon on wild populations. Aquaculture Environment Interactions . 2019. https://doi.org/10.3354/aei00346

Sophie Jensen, Oddný Ragnarsdóttir, Ragnar Jóhannsson . Marine Sources of Furan Fatty Acids. Journal of Aquatic Food Technology. 2019;28 (1):74-83. https://doi.org/10.1080/10498850.2018.1561569

Stephen Knobloch, Ragnar Jóhannsson , Viggó Marteinsson. Bacterial diversity in the marine sponge Halichondria panicea from Icelandic waters and host-specificity of its dominant symbiont “Candidatus Halichondribacter symbioticus”. FEMS Microbiology Ecology. 2019;95 (1). https://doi.org/10.1093/femsec/fiy220

2018

Birgir Örn Smárason, Björn Alriksson, Ragnar Jóhannsson . Safe and sustainable protein sources from the forest industry – The case of fish feed. Trends in Food Science and Technology. 2018. https://doi.org/10.1016/j.tifs.2018.03.005

Bryndís Björnsdóttir, Margrét Geirsdóttir, Elísabet Eik Guðmundsdóttir, Guðjón Þorkelsson, Rósa Jónsdóttir, Gunnar Þórðarson, René Groben, Stephen Knobloch, Aviaja Lyberth Hauptmann, Janus Vang, Ingunn Gunnarsdóttir, Ragnar Jóhannsson , Lisbeth Due Schönemann-Paul, Sigrún Elsa Smáradóttir. Biorefining and Biotechnology Opportunities in the West Nordic Region . 2018;03-18.

2017

Ragnar Jóhannsson , Sigurður Guðjónsson, Agnar Steinarsson , Jón Hlöðver Friðriksson . Áhættumat vegna mögulegrar erfðablöndunar milli eldislaxa og náttúrulegra laxastofna á Íslandi. HV 2017-027. 2017.

Erik Borchert, Stephen Knobloch, Emilie Dwyer, Sinéad Flynn, Stephen A. Jackson, Ragnar Jóhannsson , Viggó Marteinsson, Fergal O'Gara, Alan D. W. Dobson. Biotechnological Potential of Cold Adapted Pseudoalteromonas spp. Isolated from ‘Deep Sea’ Sponges. Marine Drugs. 2017;15 (6).

2016

Jan Erik Lindberg, Gunnar Lindberg, Jukka Teräs, Gert Poulsen, Svein Öivind Solberg, Knud Tybrik, Joanna Przwdrzymirska, Grazyna Pazikowska Sapota, Malene Lihme Olsen, Hilary Karlsson, Ragnar Jóhannsson , Birgir Örn Smárason, Morten Gylling, Marie Storr-Paulsen, Trydeman Knudsen, Theodora Dorca-Preda, John E. Hermansen, Zanda Kruklite, Inga Berzina. Nordic Alternative Protein Potentials Mapping of regional bioeconomy opportunities. 2016.

2014

Björn Alriksson, Andreas Hörnberg, Ásgeir Eiríkur Guðnason, Stephen Knobloch, Jón Árnason, Ragnar Jóhannsson . Fish feed from wood. Cellulose Chemistry and Technology. 2014;48 (9-10):843-848.

2013

Tom Brenner, Shingo Matsukawa, Katsuyoshi Nishinari, Ragnar Jóhannsson . Failure in a soft gel: Delayed failure and the dynamic yield stress. Journal of Non-Newtonian Fluid Mechanics. 2013;196:1-7. https://doi.org/10.1016/j.jnnfm.2012.12.011

Odoli Ogombe Cyprian, Heléne L. Lauzon, Ragnar Jóhannsson , Kolbrún Sveinsdóttir, Sigurjón Arason, Emilía Marteinsdóttir. Shelf life of air and modified atmosphere‐packaged fresh tilapia (Oreochromis niloticus) fillets stored under chilled and superchilled conditions. Food Science and Nutrition. 2013;1 (2):130-140. https://doi.org/10.1002/fsn3.18

Odoli Ogombe Cyprian, Kolbrún Sveinsdóttir, Hannes Magnússon, Sigurjón Arason, Ragnar Jóhannsson , Emilía Marteinsdóttir. Development of Quality Index Method (QIM) Scheme for Farmed Tilapia Fillets and Its Application in Shelf Life Study. Journal of Aquatic Food Product Technology. 2013;23 (3). https://doi.org/10.1080/10498850.2012.713088

2012

Ragnar Jóhannsson . Hver fjarlægði lík Staðarbræðra? - Tilgáta um glæp . Skírnir. 2012;186:167-192.

2010

Margrét Geirsdóttir, Sjöfn Sigurgísladóttir, Patricia Y. Hamaguchi, Guðjón Þorkelsson, Ragnar Jóhannsson , Hörður G. Kristinsson, Magnús M. Kristjánsson. Enzymatic Hydrolysis of Blue Whiting (Micromesistius poutassou); Functional and Bioactive Properties. Journal of Food Science. 2010;76 (1). https://doi.org/10.1111/j.1750-3841.2010.01877.x

Tao Wang, Guðrún Ólafsdóttir, Rósa Jónsdóttir, Hörður G. Kristinsson, Ragnar Jóhannsson . Functional and Nutraceutical Ingredients from Marine Macroalgae. Handbook of Seafood Quality, Safety and Health Applications. 2010. https://doi.org/10.1002/9781444325546.ch42

Sivakumar Raghavan, Hörður G. Kristinsson, Guðjón Þorkelsson, Ragnar Jóhannsson . Antioxidative Properties of Fish Protein Hydrolysates. Handbook of Seafood Quality, Safety and Health Applications. 2010. https://doi.org/10.1002/9781444325546.ch41

2009

Tom Brenner, Taco Nicolai, Ragnar Jóhannsson . Rheology of thermo-reversible fish protein isolate gels. Food Research International. 2009;42 (8):915-924. https://doi.org/10.1016/j.foodres.2009.04.020

Tom Brenner, Ragnar Jóhannsson , Taco Nicolai. Characterisation and thermo-reversible gelation of cod muscle protein isolates. Food Chemistry. 2009;115 (1):26-31. https://doi.org/10.1016/j.foodchem.2008.11.046

Tom Brenner, Ragnar Jóhannsson , Taco Nicolai. Characterization of fish myosin aggregates using static and dynamic light scattering. Food Hydrocolloids. 2009;23 (2):296-305. https://doi.org/10.1016/j.foodhyd.2008.01.003

2007

Ragnar Jóhannsson , Mats Almgren. A fluorescence and phosphorescence study of AOT/H2O/alkane systems in the L2 reversed micellar phase. Trends in Colloid and Interface Science V. 2007;84. https://doi.org/10.1007/BFb0115937

Laurent Vandanjon, Ragnar Jóhannsson , Maryse Derouiniot, Patrick Bourseau, Pascal Jaouen. Concentration and purification of blue whiting peptide hydrolysates by membrane processes. Journal of Food Engineering. 2007;83 (4):581-589. https://doi.org/10.1016/j.jfoodeng.2007.03.040

2006

A. Chabeaud, Laurent Vandanjon, Pascal Jaouen, P. Bourseau, Charles Delannoy, Ragnar Jóhannsson , Guðjón Þorkelsson, Fabienne Guérard. Full utilisation of the catch: Evaluation of antioxidant activities in by-product hydrolysates, fractionation and concentration of active molecules using separation technologies (ultra- and nanofiltration technologies). Seafood Research from Fish to Dish: Quality, Safety and Processing of Wild and Farmed Seafood. 2006.

1996

Christophe Chassenieaux, Ragnar Jóhannsson , Dominique Durand, Taco Nicolai, Pierre Vanhoorne, Robert Jérome. Telechelic ionomers studied by light scattering and dynamic mechanical measurements. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 1996;155-162. https://doi.org/10.1016/0927-7757(96)03620-5

1995

Ragnar Jóhannsson , Christophe Chassenieaux, Dominique Durand, Taco Nicolai, Pierre Taberlet, Robert Jérome. Dynamic Properties of the Transient Network formed by Telechelic Ionomers Studied by Dynamic Light Scattering and Dynamic Mechanical Analysis. Macromolecules. 1995;28 (25):8504-8510. https://doi.org/10.1021/ma00129a006

Marilena Vasilescu, Agneta Caragheorgheopol, Mats Almgren, Wyn Brown, Jan Alsins, Ragnar Jóhannsson . Structure and Dynamics of Nonionic Polyoxyethylenic Reverse Micelles by Time-Resolved Fluorescence Quenching. Langmuir. 1995;11 (8):2893-2898. https://doi.org/10.1021/la00008a009

1994

Paul D. I. Fletcher, Ragnar Jóhannsson . Time-resolved fluorescence probing of oil-in-water microemulsions stabilised by non-ionic surfactants. Journal of the Chemical Society, Faraday Transactions. 1994;90 (23):3567-3572. https://doi.org/10.1039/ft9949003567

1993

Ragnar Jóhannsson , Mats Almgren. Intradroplet exchange rate and activation energy of fusion in AOT water/oil microemulsions in the cluster regime of the L2 phaseL. Langmuir. 1993;9 (11):2879-2882. https://doi.org/10.1021/la00035a025

Mats Almgren, Ragnar Jóhannsson , Jan Christer Eriksson. Polydispersity of AOT droplets measured by time-resolved fluorescence quenching. The Journal of Physical Chemistry. 1993;97 (33):8590-8594. https://doi.org/10.1021/j100135a010

Ragnar Jóhannsson , Mats Almgren, Reinhard Schomäcker. Diffusion-controlled reactions in bicontinuous microemulsions of AOT and C12E5 (pentaoxyethylene monododecyl ether) studied by triplet-state deactivation. Langmuir. 1993;9 (5):1269-1273. https://doi.org/10.1021/la00029a019

1992

Mats Almgren, Ragnar Jóhannsson . Deactivation of excited species by diffusion-controlled quenching in clusters of reversed micelles. The Journal of Physical Chemistry. 1992;96 (23):9512-9517. https://doi.org/10.1021/j100202a080

Mats Almgren, Jan Alsins, Ragnar Jóhannsson , Emad Mukhtar. Effects of dimensionality on diffusion-controlled deactivation of excited species. Proceedings of the Indian Academy of Sciences - Chemical Sciences. 1992;104 (2):275-285.

1991

Ragnar Jóhannsson , Mats Almgren, Jan Alsins. Fluorescence and phosphorescence study of AOT/H sub 2 O/alkane systems in the L sub 2 reversed micellar phase. The Journal of Physical Chemistry. 1991;95 (9):3819-3823.