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Your search keyword '"Rasmussen, Knut"' showing total 248 results
Start Over Author "Rasmussen, Knut" Publication Type Academic Journals
248 results on '"Rasmussen, Knut"'

15. Hollow-fiber liquid-phase microextraction in the three-phase mode--practical considerations

Author

Gjelstad, Astrid, Taherkhani, Hamidreza, Rasmussen, Knut Einar, and Pedersen-Bjergaard, Stig

Subjects
Polypropylene -- Usage, Mass spectrometry -- Research, Liquid chromatography -- Research, Chemistry
Abstract

In this installment of 'Sample Prep Perspectives,' Norwegian authors from the University of Oslo describe the practical aspects of hollow fiber liquidphase microextraction in the three-phase mode ([HF.sup.3]LPME). The guest [...]

Published
2011

21. Cancer incidence and mortality after treatment with folic acid and vitamin B12

Author

Ebbing, Marta, Bonaa, Kaare Harald, Nygard, Ottar, Arnesen, Egil, Ueland, Per Magne, Nordrehaug, Jan Erik, Rasmussen, Knut, Njolstad, Inger, Refsum, Helga, Nilsen, Dennis W., Tverdal, Aage, Meyer, Klaus, and Vollset, Stein Emil

Subjects
Cancer -- Care and treatment, Folic acid -- Usage, Mortality -- United States, Mortality -- Causes of, Vitamin B12 -- Usage
Abstract

The study attempts to evaluate the efficacy of vitamin B12 treatment on cancer outcomes and mortality. The results indicate that treatment with vitamin B12 and folic acid led to increased outcomes and mortality among patients with ischemic heart disease where folic acid fortification of foods was not given.

Published
2009

26. Homocysteine lowering and cardiovascular events after acute myocardial infarction

Author

Bonaa, Kaare Harald, Rasmussen, Knut, Ueland, Per Magne, Njolstad, Inger, Arnesen, Egil, Nordehaug, Jan Erik, Schirmer, Henrik, Harald Wang, Tverdal, Aage, and Steigen, Terje

Subjects
Cardiovascular diseases -- Risk factors, Cardiovascular diseases -- Care and treatment
Abstract

The efficacy of homocysteine-lowering treatment with B vitamins was evaluated for secondary prevention in patients with acute myocardial infarction. It was seen that treatment with B vitamins did not lower the risk of recurrent cardiovascular disease after acute myocardial infarction.

Published
2006

32. Liquid-liquid-liquid microextraction for sample preparation of biological fluids prior to capillary electrophoresis

Author

Pedersen-Bjergaard, Stig and Rasmussen, Knut Einar

Subjects
Electrophoresis -- Research, Extraction (Chemistry) -- Research, Chemistry
Abstract

Methamphetamine as a model compound was extracted from 2.5-mL aqueous samples adjusted to pH 13 (donor solution) through a thin phase of 1-octanol inside the pores of a polypropylene hollow fiber and finally into a 25-[[micro]liter] acidic acceptor solution inside the hollow fiber. Following this liquid-liquid-liquid microextraction (LLLME), the acceptor solutions were analyzed by capillary zone electrophoresis (CE). Extractions were performed in simple disposable devices each consisting of a conventional 4-mL sample vial, two needles for introduction and collection of the acceptor solution, and a 8-cm piece of a porous polypropylene hollow fiber. From 5 to 20 different samples were extracted in parallel for 45 min, providing a high sample capacity. Methamphetamine was preconcentrated by a factor of 75 from aqueous standard solutions, human urine, and human plasma utilizing [10.sup.-1] M HCl as the acceptor phase and [10.sup.-1] M NaOH in the donor solution. In addition to preconcentration, LLLME also served as a technique for sample cleanup since large molecules, acidic compounds, and neutral components were not extracted into the acceptor phase. Utilizing diphenhydramine hydrochloride as internal standard, repetitive extractions varied less than 5.2% RSD (n = 6), while the calibration curve for methamphetamine was linear within the range 20 ng/[[micro]liter] to 10 [[micro]gram]/mL (r = 0.9983). The detection limit of methamphetamine utilizing LLLME/CE was 5 ng/mL (S/N = 3) in both human urine and plasma.

Published
1999

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