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Artigo

Per Linse, Guđmundur Gunnarsson, Bo Joensson,

... and solutions of the Poisson-Boltzmann equationPer Linse, Gudmundur Gunnarsson, and Bo JoenssonCite this: J. Phys. Chem. 1982, ...

Tópico(s): Molecular Junctions and Nanostructures

1982 - American Chemical Society | The Journal of Physical Chemistry

Artigo Revisado por pares

Lawrence J. Altman, Pilip Laungani, Guđmundur Gunnarsson, Håkan Wennerström, Sture Forsén,

... the potential energy functionLawrence J. Altman, Pilip Laungani, Gudmundur Gunnarsson, Hakan Wennerstrom, and Sture ForsenCite this: J. Am. ...

Tópico(s): Molecular Spectroscopy and Structure

1978 - American Chemical Society | Journal of the American Chemical Society

Artigo Revisado por pares

William Egan, Guđmundur Gunnarsson, Thomas Bull, Sture Forsén,

... of the intramolecular hydrogen bond in acetylacetoneWilliam Egan, Gudmundur Gunnarsson, T. E. Bull, and Sture ForsenCite this: J. ...

Tópico(s): Various Chemistry Research Topics

1977 - American Chemical Society | Journal of the American Chemical Society

Artigo Brasil Produção Nacional Revisado por pares

Didier Aurelle, A J Baker, Lorraine Bottin, Carine Brouat, Adalgisa Caccone, A. Chaix, Pramod Dhakal, Yi Ding, Jean‐Marc Duplantier, Wolfgang Fiedler, Joanna Fietz, Y.K. Fong, Didier Forcioli, Thales Renato Ochotorena de Freitas, Guðmundur H. Gunnarsson, Oliver Haddrath, Ðenita Hadziabdic, Sigurbjörg Hauksdóttir, Nathan P. Havill, Michael Heinrich, T. Heinz, Sigríður Hjörleifsdóttir, Yan Hong, Guðmundur Ó. Hreggviðsson, Sylvain Huchette, Johanna Hurst, M. KANE, N.C. KANE, Takeshi Kawakami, Wenshan Ke, R.A. KEITH, Nadine Klauke, J. Klein, Jürgen F. J. Kun, Chun Li, G.‐Q. LI, Jinjun Li, Anne Loiseau, Lizhi Lu, M. F. Lucas, Claiton Martins-Ferreira, Kenza Mokhtar‐Jamaï, Kristinn Ólafsson, Christophe Pampoulie, Lei Pan, Margaret R. Pooler, Jindong Ren, Timothy A. Rinehart, V. Roussel, M. O. SANTOS, H. Martin Schaefer, Brian E. Scheffler, A. SCHMIDT, Gernot Segelbacher, Junda Shen, Sigurlaug Skírnisdóttir, Simone Sommer, Z.‐R. TAO, RAMONA TAUBERT, Yang Tian, Jürgen Tomiuk, Robert N. Trigiano, Mark C. Ungerer, Alain Van Wormhoudt, Phillip A. Wadl, D.‐Q. WANG, Tanja Weis‐Dootz, Qian Xia, Q.‐Y. YUAN,

Abstract This article documents the addition of 228 microsatellite marker loci to the Molecular Ecology Resources Database. Loci were developed for the following species: Anser cygnoides, Apodemus flavicollis, Athene noctua, Cercis canadensis, Glis glis, Gubernatrix cristata, Haliotis tuberculata, Helianthus maximiliani, Laricobius nigrinus, Laricobius rubidus, Neoheligmonella granjoni, Nephrops norvegicus, Oenanthe javanica, Paramuricea clavata, Pyrrhura orcesi and Samanea saman. These loci were ...

Tópico(s): Identification and Quantification in Food

2010 - Wiley | Molecular Ecology Resources

Artigo Acesso aberto Revisado por pares

Pär Söderquist, Johan Elmberg, Guðmundur H. Gunnarsson, Carl‐Gustaf Thulin, Jocelyn Champagnon, Matthieu Guillemain, Jakub Kreisinger, H.H.T. Prins, R.P.M.A. Crooijmans, R.H. Kraus,

Disruption of naturally evolved spatial patterns of genetic variation and local adaptations is a growing concern in wildlife management and conservation. During the last decade, releases of native taxa with potentially non-native genotypes have received increased attention. This has mostly concerned conservation programs, but releases are also widely carried out to boost harvest opportunities. The mallard, Anas platyrhynchos, is one of few terrestrial migratory vertebrates subjected to large-scale ...

Tópico(s): Identification and Quantification in Food

2017 - Springer Science+Business Media | European Journal of Wildlife Research

Artigo Revisado por pares

Guðmundur Smári Gunnarsson, Stefán Ó. Steingrímsson,

Territoriality and foraging behaviour play major roles in determining the abundance and distribution of mobile animals. To date, territorial behaviour of young-of-the-year (YOY) salmonids is typically described for sit-and-wait individuals that defend territories from one foraging station, but rarely for more mobile fish. We examined the territorial behaviour and foraging mode of 31 YOY Arctic char ( Salvelinus alpinus ) and 30 YOY brown trout ( Salmo trutta ) in relation to ecological factors in six rivers ...

Tópico(s): Fish Biology and Ecology Studies

2011 - Canadian Science Publishing | Canadian Journal of Fisheries and Aquatic Sciences

Artigo Revisado por pares

Geir Tryggvason, Bylgja Hilmarsdóttir, Guðmundur H. Gunnarsson, Jón J. Jónsson, Jón G. Jónasson, Magnús K. Magnússon,

Gastrointestinal stromal tumor (GIST) is the most common mesenchymal tumor of the gastrointestinal tract. It is characterized by activating mutations in the tyrosine kinase genes c-kit or PDGFRA. This study examined the mutation rate and type in a population-based material. All gastrointestinal mesenchymal tumors over the years 1990-2004 were evaluated and GIST tumors identified using immunohistochemistry (c-kit) and conventional pathologic parameters. Paraffin sections from all tumors were subjected ...

Tópico(s): Gastrointestinal disorders and treatments

2010 - Wiley | Apmis

Artigo Acesso aberto Revisado por pares

Christophe Pampoulie, Sigurlaug Skírnisdóttir, Sigurbjörg Hauksdóttir, Kristinn Ólafsson, Hrafnkell Eiríksson, Valérie Chosson, Guðmundur Ó. Hreggviðsson, Guðmundur H. Gunnarsson, Sigríður Hjörleifsdóttir,

Abstract Pampoulie, C., Skirnisdottir, S., Hauksdottir, S., Olafsson, K., Eiríksson, H., Chosson, V., Hreggvidsson, G. O., Gunnarsson, G. H., and Hjorleifsdottir, S. 2011. A pilot genetic study reveals the absence of spatial genetic structure in Norway lobster (Nephrops norvegicus) on fishing grounds in Icelandic waters. – ICES Journal of Marine Science, 68: 20–25. Stock structure of Norway lobster off southern Iceland was investigated using 12 microsatellite loci. No genetic method detected significant ...

Tópico(s): Identification and Quantification in Food

2010 - Oxford University Press | ICES Journal of Marine Science

Artigo Acesso aberto Revisado por pares

Guðmundur H. Gunnarsson,

DNA fragments containing mispaired and modified bases, bulges, lesions and specific sequences have altered conformation. Methods for separating complex samples of DNA fragments based on conformation but independent of length have many applications, including (i) separation of mismatched or unmatched DNA fragments from those perfectly matched; (ii) simultaneous, diagnostic, mismatch scanning of multiple fragments; (iii) isolation of damaged DNA fragments from undamaged fragments; and (iv) estimation ...

Tópico(s): Molecular Biology Techniques and Applications

2004 - Oxford University Press | Nucleic Acids Research

Artigo Acesso aberto

Bjarni Ásgeirsson, Jónas B. Hauksson, Guðmundur H. Gunnarsson,

Cold‐adaptation of enzymes involves improvements in catalytic efficiency. This paper describes studies on the conformational stability of a cold‐active alkaline phosphatase (AP) from Atlantic cod, with the aim of understanding more clearly its structural stability in terms of subunit dissociation and unfolding of monomers. AP is a homodimeric enzyme that is only active in the dimeric state. Tryptophan fluorescence, size‐exclusion chromatography and enzyme activity were used to monitor alterations ...

Tópico(s): Vitamin D Research Studies

2000 - Wiley | European Journal of Biochemistry

Artigo Acesso aberto Revisado por pares

Lars‐Peter Ellekilde, Jakob Wilm, Olav Wendelboe Nielsen, Christian Krogh, Ewa Kristiansen, Gudmundur G. Gunnarsson, Thor Stærk Stenvang, Johnny Jakobsen, Morten Kristiansen, Jens Ammitzbøll Glud, Morten Rieger Hannemose, Henrik Aanæs, Joakim de Kruijk, Ingolf Sveidahl, Ataul Aziz Ikram, Henrik Gordon Petersen,

SUMMARY This paper presents a novel solution for precision draping of prepreg composite fabrics onto double curved molds. Our contributions relate to system design, including hardware and software components, and to system integration. On the hardware side, design and implementation of a drape tool with up to 120 suction cups positioned individually by linear actuators are described. On the software side, design and implementation of the software architecture are presented, along with necessary ...

Tópico(s): Innovations in Concrete and Construction Materials

2020 - Cambridge University Press | Robotica

Artigo Acesso aberto Revisado por pares

Halldór Thormar, Gudmundur Bergsson, E. Gunnarsson, G. Georgsson, Myriam Witvrouw, Ólafur Steingrı́msson, Erik De Clercq, T. Kristmundsdottir,

To investigate the in vitro microbicidal and cytocidal potency of monocaprin dissolved in pharmaceutical hydrogel formulations and to evaluate their potential use as vaginal microbicides against sexually transmitted pathogens such as herpes simplex virus type 2 (HSV-2), human immunodeficiency virus type 1 (HIV-1), Chlamydia trachomatis, and Neisseria gonorrhoeae.Gel formulations were mixed with equal volumes of virus/bacteria suspensions in culture medium and incubated for 1 and 5 minutes. The reduction ...

Tópico(s): Reproductive tract infections research

1999 - BMJ | Sexually Transmitted Infections

Artigo Revisado por pares

Guðmundur H. Gunnarsson, Bjarki Guðmundsson, Hans G Thormar, Arni Alfredsson, Jón J. Jónsson,

Tópico(s): DNA and Biological Computing

2006 - Nature Portfolio | Nature Protocols

Artigo Revisado por pares

Gudmundur Ö. Gunnarsson, Sæmundur Gudmundsson, Klas Hökegård, Håkan Stale, Ingemar Kjellmer, Ola Hafström, Karel Maršál,

The purpose of this study was to assess the effects of hypocapnic hypoxia, acidemia and the combination of hypoxia/acidemia on blood flow velocity variables in the fetal cerebral circulation. Chronically instrumented fetal sheep were used and the ewes were induced to breathe a hypoxic gas mixture for about 90 min. This caused an initial period of hypoxemia followed by a period of mixed hypoxemia/acidemia. When the ewe was reoxygenated, the fetus experienced a period of normoxic acidemia. The fetal ...

Tópico(s): Pregnancy and preeclampsia studies

1998 - De Gruyter | Journal of Perinatal Medicine

Artigo Revisado por pares

Halldóra Skarphéðinsdóttir, Karl Gunnarsson, Guðmundur A. Guðmundsson, Erick Nfon,

Tópico(s): Mercury impact and mitigation studies

2009 - Springer Science+Business Media | Archives of Environmental Contamination and Toxicology

Artigo

Laurence Irving, Hildur Krog, Mildred Monson,

... 10.1016/j.biosystems.2006.08.006Pall Hersteinsson, Gudmundur Georgsson, Stefán Adalsteinsson, Eggert Gunnarsson The naked fox: hypotrichosis in arctic foxes (Alopex ...

Tópico(s): Bat Biology and Ecology Studies

1955 - University of Chicago Press | Physiological Zoology

Artigo Acesso aberto Revisado por pares

Sæmundur A. Halldórsson, Edward W. Marshall, Alberto Caracciolo, Simon Matthews, Enikö Bali, Maja Bar Rasmussen, Eemu Ranta, Jóhann Gunnarsson Robin, Guðmundur H. Guðfinnsson, Olgeir Sigmarsson, John Maclennan, Matthew G. Jackson, Martin J. Whitehouse, Heejin Jeon, Quinten H. A. Van Der Meer, Geoffrey Mibei, Maarit Kalliokoski, Maria M. Repczynska, Rebekka Hlín Rúnarsdóttir, Gylfi Sigurðsson, Melissa Pfeffer, Samuel Scott, Ríkey Kjartansdóttir, Barbara I. Kleine, Clive Oppenheimer, Alessandro Aiuppa, Evgenia Ilyinskaya, Marcello Bitetto, Gaetano Giudice, Andri Stefánsson,

Abstract Recent Icelandic rifting events have illuminated the roles of centralized crustal magma reservoirs and lateral magma transport 1–4 , important characteristics of mid-ocean ridge magmatism 1,5 . A consequence of such shallow crustal processing of magmas 4,5 is the overprinting of signatures that trace the origin, evolution and transport of melts in the uppermost mantle and lowermost crust 6,7 . Here we present unique insights into processes occurring in this zone from integrated petrologic and ...

Tópico(s): earthquake and tectonic studies

2022 - Nature Portfolio | Nature

Artigo Revisado por pares

Hannes Sigurjónsson, Karl Andersen, Maríanna Garðarsdóttir, Vigdís Pétursdóttir, Gudmundur Klemenzson, Gunnar Gunnarsson, Ragnar Daníelsen, Tómas Guðbjartsson,

Cardiac myxoma (CM) is the most common primary benign tumor of the heart, but the true age-standardized incidence rate (ASR) has remained unknown. We therefore used nationwide registries in Iceland to study CM and establish its incidence rate. This was a retrospective study involving all patients diagnosed with CM in Iceland between 1986 and 2010. Cases were identified through three different registries, and hospital charts and histology results reviewed. An ASR was estimated based on a world standard ...

Tópico(s): Vascular Tumors and Angiosarcomas

2011 - Wiley | Apmis

Artigo Acesso aberto Revisado por pares

Hans G Thormar, Bjarki Guðmundsson, Freyja Eiriksdottir, Siyoen Kil, Guðmundur H. Gunnarsson, Magnús K. Magnússon, Jason C. Hsu, Jón J. Jónsson,

BACKGROUND The causes of imprecision in microarray expression analysis are poorly understood, limiting the use of this technology in molecular diagnostics. Two-dimensional strandness-dependent electrophoresis (2D-SDE) separates nucleic acid molecules on the basis of length and strandness, i.e., double-stranded DNA (dsDNA), single-stranded DNA (ssDNA), and RNA·DNA hybrids. METHODS We used 2D-SDE to measure the efficiency of cDNA synthesis and its importance for the imprecision of an in vitro transcription– ...

Tópico(s): Molecular Biology Techniques and Applications

2013 - American Association for Clinical Chemistry | Clinical Chemistry

Artigo Acesso aberto Revisado por pares

S.R. Gíslason, Gerður Stefánsdóttir, Melissa Pfeffer, Sara Barsotti, Th. Jóhannsson, Iwona Gałeczka, Enikö Bali, Olgeir Sigmarsson, Andri Stefánsson, N.S. Keller, Árni Sigurðsson, Baldur Bergsson, B. Galle, V.C. Jacobo, Santiago Arellano, Alessandro Aiuppa, Elín Björk Jónasdóttir, Eydís Salome Eiríksdóttir, Sigurður Jakobsson, Guðmundur H. Guðfinnsson, Sæmundur A. Halldórsson, Haraldur Gunnarsson, Baptiste Haddadi, Ingibjörg S. Jónsdóttir, T. Thórdarson, Morten S. Riishuus, Þórdís Högnadóttir, Tobias Dürig, Gro B. M. Pedersen, Ármann Hóskuldsson, M. T. Guđmundsson,

The effusive six months long 2014-2015 Bárðarbunga eruption (31 August-27 February) was the largest in Iceland for more than 200 years, producing 1.6 ± 0.3 km 3 of lava.The total SO 2 emission was 11 ± 5 Mt, more than the amount emitted from Europe in 2011.The ground level concentration of SO 2 exceeded the 350 µg m -3 hourly average health limit over much of Iceland for days to weeks.Anomalously high SO 2 concentrations were also measured at several locations in Europe in September.The lowest pH of fresh ...

Tópico(s): Atmospheric chemistry and aerosols

2015 - | Geochemical Perspectives Letters

Artigo Acesso aberto Revisado por pares

Brynja Davíðsdóttir, Tómas G. Gunnarsson, Guðmundur Halldórsson, Bjarni D. Sigurðsson,

Degradation of ecosystems and introductions of invasive species pose a threat to global biodiversity.Ecosystem restoration and revegetation actions are important for amending habitat loss and for the protection of species of plants and animals.Iceland has the highest rate of soil erosion and desertification in Northern Europe and counteractions to erosion and revegetation measures have taken place for over a century.We studied the effect of revegetation on the density and composition of birds and ...

Tópico(s): Peatlands and Wetlands Ecology

2016 - | Icelandic Agricultural Sciences

Revisão Acesso aberto Revisado por pares

Egil Ferkingstad, Ásmundur Oddsson, Sólveig Grétarsdóttir, Stefania Benónísdóttir, Guðmar Þorleifsson, Aimée M. Deaton, Stefan Jonsson, Ólafur Andri Stefánsson, Gudmundur L. Norddahl, Florian Zink, Gudny A. Arnadottir, Bjarni Gunnarsson, Gísli H. Halldórsson, Anna Helgadóttir, Brynjar Ö. Jensson, Ragnar P. Kristjansson, Garðar Sveinbjörnsson, David A. Sverrisson, Gísli Másson, Ísleifur Ólafsson, Guðmundur I. Eyjólfsson, Ólöf Sigurðardóttir, Hilma Hólm, Ingileif Jónsdóttir, Sigurdur Olafsson, Þóra Steingrímsdóttir, Þórunn Rafnar, Einar S. Björnsson, Unnur Þorsteinsdóttir, Daníel F. Guðbjartsson, Patrick Sulem, Kāri Stefánsson,

Abstract Gallstones are responsible for one of the most common diseases in the Western world and are commonly treated with cholecystectomy. We perform a meta-analysis of two genome-wide association studies of gallstone disease in Iceland and the UK, totaling 27,174 cases and 736,838 controls, uncovering 21 novel gallstone-associated variants at 20 loci. Two distinct low frequency missense variants in SLC10A2 , encoding the apical sodium-dependent bile acid transporter (ASBT), associate with an increased ...

Tópico(s): Drug Transport and Resistance Mechanisms

2018 - Nature Portfolio | Nature Communications

Capítulo de livro Revisado por pares

Gudmundur G. Gunnarsson, Ole Wennerberg Nielsen, Christian Schlette, Henrik Gordon Petersen,

Robotic layup of pre-impregnated (prepreg) fiber plies onto complex molds is a hitherto unsolved problem. At the University of Southern Denmark (SDU), we have gathered an international consortium with industrial keyplayers for addressing this gap in the FlexDraper project. We use an underactuated array of suction cups to handle the plies and our approach is based on model- and simulation-based control of the shaping of the tool and the free hanging plies during the draping procedure. This requires ...

Tópico(s): Additive Manufacturing and 3D Printing Technologies

2019 - Springer Science+Business Media | Lecture notes in electrical engineering

Artigo Acesso aberto Revisado por pares

Gro B. M. Pedersen, Joaquín M. C. Belart, Birgir V. Óskarsson, M. T. Guđmundsson, Nils Gies, Þórdís Högnadóttir, Ásta Rut Hjartardóttir, Virginie Pinel, Étienne Berthier, Tobias Dürig, Hannah I. Reynolds, C. W. Hamilton, Guðmundur Valsson, Páll Einarsson, Daniel Ben‐Yehoshua, Andri Gunnarsson, Björn Oddsson,

Abstract The basaltic effusive eruption at Mt. Fagradalsfjall lasted from 19 March to 18 September 2021, ending a 781‐year repose period on Reykjanes Peninsula, Iceland. By late September 2021, 33 near real‐time photogrammetric surveys were completed using satellite and airborne images, usually processed within 3–6 hr. The results provide unprecedented temporal data sets of lava volume, thickness, and effusion rate. This enabled rapid assessment of eruption evolution and hazards to populated areas, ...

Tópico(s): Arctic and Antarctic ice dynamics

2022 - American Geophysical Union | Geophysical Research Letters

Artigo Revisado por pares

P. Thorbjornsdottir, R. Kolka, Eggert Gunnarsson, Slavko Bambir, Guðmundur Þorgeirsson, Girish J. Kotwal, G. J. Arason,

Complement is known to be activated in atherosclerotic lesions, but the importance of this event in disease pathology is a matter of debate. Studies of rabbits fed a high-fat diet have indicated complement activation as a rate-limiting step, whereas results from genetically modified mouse strains (ApoE-/- or LDLR-/-) have failed to support this finding. To resolve whether this reflects differences between species or between genetically driven and diet-induced disease, we studied the effect of a complement ...

Tópico(s): Herpesvirus Infections and Treatments

2005 - Wiley | Annals of the New York Academy of Sciences

Artigo Acesso aberto

Hilmar Kjartansson, Ingvar Hákon Ólafsson, Sigurbergur Kárason, Hjalti M. Thorisson, Baldur Tumi Baldursson, Eggert Gunnarsson, Einar Jörundsson, Guðmundur Fertram Sigurjónsson,

Recently the use of biologic materials as dura mater repair patches has been increasing. The purpose of this study is to assess the basis for efficacy and safety of using a novel fish derived acellular dermis (Kerecis Omega3 DuraTM). In an ovine model a craniotomy under general anaesthesia was performed. A defect was produced in the dural covering of approximately 1 × 2 cm and closed with an onlay technique, with Kerecis Omega3 Dura. The bone defect was covered with the bony flap and the overlying ...

Tópico(s): Cleft Lip and Palate Research

2015 - Scientific Research Publishing | Open Journal of Modern Neurosurgery

Artigo Acesso aberto Revisado por pares

Paul M. Stewart, Beverly M. K. Biller, Claudio Marelli, Candace Gunnarsson, Michael P. Ryan, Gudmundur Johannsson,

Patients with adrenal insufficiency (AI) (primary AI [PAI], secondary AI due to a pituitary disorder [PIT] and congenital adrenal hyperplasia [CAH]) have reduced life expectancy; however, the underlying explanation remains unknown.To evaluate characteristics, comorbidities, and hospitalizations in AI patients.Retrospective observational.Using a United States-based national payer database comprising of more than 108 million members, strict inclusion criteria including diagnostic codes and steroid prescription ...

Tópico(s): Pituitary Gland Disorders and Treatments

2016 - Oxford University Press | The Journal of Clinical Endocrinology & Metabolism

Artigo Revisado por pares

Gudmundur Ö. Gunnarsson,

Objective: To establish normal reference values for blood flow velocity indices in the human fetal middle cerebral, renal and femoral arteries. Methods: In a cross-sectional study, 83 fetuses in uncomplicated pregnancies were examined. The umbilical artery was also studied to obtain the ratio between blood flow indices in the middle cerebral artery and umbilical artery. Results: Pulsatility index (PI) in the middle cerebral artery manifested an increase in the late second trimester and early third ...

Tópico(s): MRI in cancer diagnosis

1996 - Elsevier BV | European Journal of Ultrasound