R. Hobkirk, A. ALFHEIM, Sidsel Bugge,
... this author on: Oxford Academic Google Scholar A. ALFHEIM, A. ALFHEIM 1Department of Metabolism and McGill University Clinic, The ...
Tópico(s): Gestational Diabetes Research and Management
1959 - Oxford University Press | The Journal of Clinical Endocrinology & Metabolism
Mona. Moeller, Ingrid Alfheim, Steinar Larssen, A. Mikalsen,
... to traffic and air pollution parametersMona. Moeller, Ingrid. Alfheim, Steinar. Larssen, and Adler. MikalsenCite this: Environ. Sci. ...
Tópico(s): Energy and Environment Impacts
1982 - American Chemical Society | Environmental Science & Technology
Jan Alan Alfheim, Cooper H. Langford,
... of formaldehyde with the thermal lens effectJan A. Alfheim and Cooper H. LangfordCite this: Anal. Chem. 1985, ...
Tópico(s): Chemical Thermodynamics and Molecular Structure
1985 - American Chemical Society | Analytical Chemistry
Tore Alfheim, Johannes Dale, P. Groth, Klaus D. Krautwurst,
T. Alfheim, J. Dale, P. Groth and K. D. Krautwurst, J. Chem. Soc., Chem. Commun., 1984, 1502 DOI: 10. ...
Tópico(s): Chemical Reaction Mechanisms
1984 - Royal Society of Chemistry | Journal of the Chemical Society Chemical Communications
R. Hobkirk, P. R. BLAHEY, A. ALFHEIM, J.I. Raeside, Guy E. Joron,
Urinary levels of estriol, estrone and estradiol-17β (estradiol) increase during the last 20 weeks of pregnancy in a qualitatively similar fashion in both the normal and diabetic states. The relative amounts of these estrogens found in the urine suggest that they arise from the same source in both groups according to the transformation, estradiol⇌estrone→estriol. It also appears likely that there is an additional source of estriol in the two groups, particularly in late pregnancy. There is a tendency ...
Tópico(s): Ovarian function and disorders
1960 - Oxford University Press | The Journal of Clinical Endocrinology & Metabolism
... Structure 7, 67 (1971). 4 S. Cyvin, L. Alfheim, and G. Hagen, Acta chem. Scand 24, 3038 ( ...
Tópico(s): Phase Equilibria and Thermodynamics
1978 - Wiley | physica status solidi (a)
Göran Löfroth, Edward Hefner, Ingrid Alfheim, Mona Møller,
Extracts from several different photocopies were mutagenic in the Ames Salmonella assay. The mutagenic behavior was similar for extracts from copies and corresponding toners indicating that toners are directly responsible for the mutagenicity. The mutagenicity is caused by at least two classes of compounds which may be present either alone or in combination in any toner.
Tópico(s): Skin Protection and Aging
1980 - American Association for the Advancement of Science | Science
The mutagenicity of airborne particulate matter from two locations in Oslo has been studied during the months February to April 1978 using the Ames' Salmonella/liver microsome assay. The content of polycyclic aromatic hydrocarbons (PAH) was determined in some samples. The mutagenic activity of cyclohexane extracts using strain TA98 was for most samples not enhanced by the addition of liver microsomes, indicating the presence of mutagens other than PAH which require metabolic activation. Daily variations ...
Tópico(s): Air Quality and Health Impacts
1980 - Elsevier BV | Atmospheric Environment (1967)
Tópico(s): Toxic Organic Pollutants Impact
1979 - Elsevier BV | The Science of The Total Environment
Thomas Ramdahl, Ingrid Alfheim, S. Rustad, Torbjørn Olsen,
Tópico(s): Radiation Effects and Dosimetry
1982 - Elsevier BV | Chemosphere
Ingrid Alfheim, J G Bergström, Dag Jenssen, Mona Møller,
The mutagenicity of emission samples from three oil-fired and four coal-fired boilers have been compared by using the Salmonella/microsome assay. Very little or no mutagenic activity was observed in samples from five of these boilers. The sample from one oil-fired boiler showed mutagenic activity of about 500 revertants/MJ, and the sample from a coal-fired fluidized bed combustor had an activity of 58,000 revertants/MJ measured with strain TA 98 in the absence of metabolic activation. All samples ...
Tópico(s): Genetically Modified Organisms Research
1983 - National Institute of Environmental Health Sciences | Environmental Health Perspectives
S. Hytönen, Ingrid Alfheim, Marja Sorsa,
The SCE-induction capacity of emissions from an airtight horizontal baffled residential wood stove was investigated in CHO cells. The samples were taken under normal and starved air conditions, from burning birch and spruce separately. Both particle phase and vapour phase were collected. All samples induced a dose-related response in SCE both with and without a metabolic activation system, the rat-liver microsomal fraction. The burning conditions in the stove influenced the mutagenicity of the emissions ...
Tópico(s): Toxic Organic Pollutants Impact
1983 - Elsevier BV | Mutation Research/Genetic Toxicology
Ingrid Alfheim, Göran Löfroth, Mona Møller,
Organic extracts from airborne particles collected at various sites in Scandinavia have been tested for mutagenicity in the Ames Salmonella/microsome assay. Extracts from particles in the respirable size fraction (diameter less than 3 microns) were mutagenic with and without metabolic activation. The mutagenic activity varied from day to day, mainly due to variations in meteorological parameters, especially wind speed and atmospheric stability. A seasonal variation could also be observed, with the ...
Tópico(s): Indoor Air Quality and Microbial Exposure
1983 - National Institute of Environmental Health Sciences | Environmental Health Perspectives
The emission of mutagens from various combustion sources was compared. Flue gas samples from power plants and boilers burning coal, oil and wood were studied. Little or no mutagenic activity was observed in samples from big boilers operated under optimal conditions. The mutagenic activity of emission samples from different boiler systems burning the same fuel varied considerably. This variation was larger than the difference obtained from boilers of comparable size utilizing different fuels. The ...
Tópico(s): Plant Genetic and Mutation Studies
1983 - Elsevier BV | Mutation Research/Genetic Toxicology
Ingrid Alfheim, Thomas Ramdahl,
Abstract Samples of airborne particles have been collected in the same room when the room was heated by electricity and when heating was done by woodburning. These samples were compared with respect to mutagenic activity and concentration of polycyclic aromatic hydrocarbons (PAH). The effects of the various heating conditions were examined in the presence and absence of tobacco smoking. Whereas wood heating in an “airtight” stove was found to cause only minor changes in the concentration of PAH and ...
Tópico(s): Toxic Organic Pollutants Impact
1984 - Wiley | Environmental Mutagenesis
Walter A. Korfmacher, Peter P. Fu, Ming W. Chou, R. K. Mitchum,
... 1978) 575. 8 G. Lofroth, E. Hefner, I. Alfheim, and M. Moller, Science 209 (1980) 1037. 9 ...
Tópico(s): Toxic Organic Pollutants Impact
1984 - Wiley | Journal of High Resolution Chromatography
Ingrid Alfheim, Alf Bjørseth, Mona Møller, Gerald L. Fisher,
Methodologies for characterization of mutagens in complex mixtures have been reviewed. The methods discussed include successive fractionation with various solvents, combinations of chemical fractionation and bio‐assay directed analyses and separation with in situ testing using thin layer chromatography or other separation techniques. In all cases the discussions are limited to the Ames Salmonella assay as detection method for mutagenicity. Particular problems in testing complex samples such as bacterial ...
Tópico(s): Pharmaceutical and Antibiotic Environmental Impacts
1984 - CRC Press | Critical Reviews in Environmental Control
Ingrid Alfheim, Georg Becher, Jan K. Hongslo, Thomas Ramdahl,
Abstract Organic extracts of emissions from wood combustion have been fractionated by high performance liquid chromatography (HPLC) into 25–28 fractions. Each fraction was tested for mutagenic activity in a modified Ames Salmonella /microsome bioassay requiring one‐third of the test volumes needed for the ususal test. Direct mutagenic activity was noted predominantly in the most polar fractions, whereas indirect mutagenic activity was associated with the fractions containing polycyclic aromatic hydrocarbons ( ...
Tópico(s): Toxic Organic Pollutants Impact
1984 - Wiley | Environmental Mutagenesis
Thomas Ramdahl, Jørgen Schjoldager, Lloyd A. Currie, J. E. Hanssen, Mona Møller, George A. Klouda, Ingrid Alfheim,
Residential wood combustion has been shown to be a very important source to air pollution including particles, polycyclic aromatic hydrocarbons and mutagenic compounds. The resulting levels measured were considerably higher than what would have been expected in a small town like Elverum with few other pollution sources. Radiocarbon information in addition to chemical analysis and biological characterization has shown to be an extremely valuable technique for quantitative assessment of RWC pollution ...
Tópico(s): Vehicle emissions and performance
1984 - Elsevier BV | The Science of The Total Environment
Ingrid Alfheim, Anne Lindskog,
Samples of urban air were collected simultaneously using different sampling systems, including electrostatic precipitation (ESP) and high volume filtration (HVF) on various filters for particle sampling and adsorption on activated carbon and organic polymers for sampling of volatiles. Acetone extracts of the samples were analyzed for polycyclic aromatic hydrocarbons (PAH) and tested for mutagenicity with the Ames Salmonella/microsome assay. The results show that the concentrations of PAH found in the ...
Tópico(s): Carcinogens and Genotoxicity Assessment
1984 - Elsevier BV | The Science of The Total Environment
Tore Alfheim, Solfrid Buøen, Johannes Dale, Klaus D. Krautwurst, Povl Krogsgaard‐Larsen, Ragnar Ryhage, Roland Isaksson,
Tópico(s): Porphyrin and Phthalocyanine Chemistry
1986 - Royal Society of Chemistry | Acta chemica Scandinavica/Acta chemica Scandinavica. B, Organic chemistry and biochemistry/Acta chemica Scandinavica. A, Physical and inorganic chemistry/Acta chemica Scandinavica. Series B. Organic chemistry and biochemistry/Acta chemica Scandinavica. Series A, Physical and inorganic chemistry
Ebba Nexø, F Engbaek, Per Magne Ueland, Christina Westby, Paudy O’Gorman, Carole Johnston, Bengt Frode Kase, Anne Berit Guttormsen, Ingrid Alfheim, Joseph McPartlin, David A. Smith, Jan Møller, Karsten Boye Rasmussen, Robert Clarke, John M. Scott, Helga Refsum,
There is a need for systematic evaluation of methods before their release to the market. We addressed this problem in novel homocysteine assays as part of an European Demonstration Project involving six centers in four countries.Two immunological methods for measurement of plasma total homocysteine (P-tHcy), the fluorescence polarization immunoassay (FPIA) and the enzyme immunoassay (EIA), were compared with two comparison methods, HPLC and gas chromatography-mass spectrometry (GC-MS). All laboratories ...
Tópico(s): Acute Lymphoblastic Leukemia research
2000 - American Association for Clinical Chemistry | Clinical Chemistry
Håkon Kvale Stensland, Vamsidhar Reddy Gaddam, Marius Tennøe, Espen Helgedagsrud, Mikkel Næss, Henrik Kjus Alstad, Asgeir Mortensen, Ragnar Langseth, Sigurd Ljødal, Østein Landsverk, Carsten Griwodz, Pål Halvorsen, Magnus Stenhaug, Dag Johansen,
... camera array. A prototype is currently installed at Alfheim Stadium in Norway, and in this article, we ...
Tópico(s): Anomaly Detection Techniques and Applications
2014 - Association for Computing Machinery | ACM Transactions on Multimedia Computing Communications and Applications
Frank Frantzen, Arne Ludvig Faaren, Ingrid Alfheim, Arne Kristian Nordhei,
Abstract A rapid and precise immunoassay for quantification of total homocysteine in blood samples is presented. The method avoids the use of radioisotopes and chromatographic separations and relies on enzymatic conversion of homocysteine to S-adenosyl-l-homocysteine, followed by quantification of S-adenosyl-l-homocysteine by an enzyme-linked immunoassay in microtiter format. The within- and between-assay imprecision is <6% and 8%, respectively, and results by the method show good correlation ...
Tópico(s): Metabolism and Genetic Disorders
1998 - American Association for Clinical Chemistry | Clinical Chemistry
Hanne Birgit Alfheim, Leiv Arne Rosseland, Kristin Hofsø, Milada Cvancarova Småstuen, Tone Rustøen,
ContextIntensive care unit (ICU) patients experience physical and psychological challenges related to ICU admission in the acute and recovery phases after a critical illness. Involvement of family caregivers (FCs) is essential in the patients' struggle to survive critical illness. FCs report a high symptom burden related to ICU admission. Previous research has investigated mainly single symptoms. Little is known about multiple symptom burden related to FC experiences in an ICU.ObjectiveThis study ...
Tópico(s): Family Caregiving in Mental Illness
2017 - Elsevier BV | Journal of Pain and Symptom Management
Hanne Birgit Alfheim, Milada Cvancarova Småstuen, Kristin Hofsø, Kirsti Tøien, Leiv Arne Rosseland, Tone Rustøen,
Background Family caregivers of patients in the intensive care unit (ICU) experience impairments in the quality of life. Previous studies report that psychological quality of life improves over time, but there has been limited longitudinal research, and measurement points have differed. Factors such as age, gender, and posttraumatic stress symptoms have been found to be associated with the quality of life, but level of hope and its associations with the quality of life have not been investigated. ...
Tópico(s): Palliative Care and End-of-Life Issues
2018 - Elsevier BV | Australian Critical Care
Henrik Lemcke Alfheim, Kjetil Muggerud, Morten Breivik, Edmund Brekke, Egil Eide, Øystein Engelhardtsen,
A Dynamic Positioning (DP) control system is developed, implemented and tested for a scale model of DNV GL's concept ship ReVolt. This model-scale ship is used as a test platform for sensors and control systems used in autonomous vessels, and this paper focuses on the functionality and implementation of the components and control system required to achieve DP capabilities on the ReVolt model ship. The DP system consists of a 3-Degree of Freedom reference filter, Proportional-Integral-Derivative (PID) ...
Tópico(s): Underwater Vehicles and Communication Systems
2018 - Elsevier BV | IFAC-PapersOnLine
Hanne Birgit Alfheim, Kristin Hofsø, Milada Cvancarova Småstuen, Kirsti Tøien, Leiv Arne Rosseland, Tone Rustøen,
To describe the prevalence and trajectory of family caregivers' post-traumatic stress symptoms during the first year after a patient's admission to the intensive care unit and identify associations between family caregivers' background characteristics, hope and post-traumatic stress symptoms.Family caregivers of intensive care unit patients (n = 211) completed questionnaires at patient admission to the intensive care unit and thereafter at 1, 3, 6, and 12 months. Mixed-model analyses were performed. ...
Tópico(s): Family Caregiving in Mental Illness
2018 - Elsevier BV | Intensive and Critical Care Nursing
Gro Frivold, Anne Sophie Ågård, Hanne Irene Jensen, Eva Åkerman, Mariann Fossum, Hanne Birgit Alfheim, Matias Rasi, Ranveig Lind,
Relevance to clinical practice The findings from the study highlighting family involvement, high-quality communication and flexible visiting policy as central aspects of family care may inspire clinicians to identify aspects of everyday family care in their ICUs calling for further improvement.To describe family involvement, communication practices and visiting policies in adult ICUs.A cross-sectional survey.A questionnaire consisting of 11 sections was developed, pilot tested and e-mailed to 196 ...
Tópico(s): Infant Development and Preterm Care
2021 - Wiley | Nursing in Critical Care
Hanne Irene Jensen, Eva Åkerman, Ranveig Lind, Hanne Birgit Alfheim, Gro Frivold, Isabell Fridh, Anne Sophie Ågård,
To examine conditions and strategies to meet the challenges imposed by the coronavirus disease 2019 (COVID-19)-related visiting restrictions in Scandinavian intensive care units.A cross-sectional survey.Adult intensive care units in Denmark, Norway and Sweden.Likert scale responses and free-text comments within six areas: capacity and staffing, visiting policies and access to the unit, information and conferences with relatives, written information, children as relatives and follow-up initiatives. ...
Tópico(s): Palliative Care and End-of-Life Issues
2021 - Elsevier BV | Intensive and Critical Care Nursing