| 1. |
- Wisniewska, M, et al.
(författare)
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Detection of specific Helicobacter pylori DNA and antigens in stool samples in dyspeptic patients and healthy subjects
- 2002
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Ingår i: Microbiology and Immunology. - 1348-0421. ; 46:10, s. 657-665
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Tidskriftsartikel (refereegranskat)abstract
- In this study stool samples from dyspeptic patients and healthy subjects were used for detection of specific Helicobacter pylori antigens and DNA by immunoenzymatic test (PPHpSA) and semi-nested PCR (ureA-PCR), respectively. The H. pylori status was estimated by invasive endoscopy-based rapid urease test and histology or noninvasive urea breath test (UBT), and by serology (ELISA, Western blot). The coincidence of IT pylori-negative invasive tests or UBT and negative antigen or DNA stool tests was very high (mean 95%). The PPHpSA results were found positive for 56% and ureA-PCR for 26% of individuals with H. pylori infection confirmed by invasive tests or UBT. The detection of specific H. pylori antigens and especially DNA in feces is not sufficient as a one-step diagnosis of H. pylori infection.
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| 2. |
- Klepp, J., et al.
(författare)
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Diffraction of slow neutrons by holographic SiO2 nanoparticle-polymer composite gratings
- 2011
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Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 84:1
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Tidskriftsartikel (refereegranskat)abstract
- Diffraction experiments with holographic gratings recorded in SiO2 nanoparticle-polymer composites have been carried out with slow neutrons. The influence of parameters such as nanoparticle concentration, grating thickness, and grating spacing on the neutron-optical properties of such materials has been tested. Decay of the grating structure along the sample depth due to disturbance of the recording process becomes an issue at grating thicknesses of about 100 microns and larger. This limits the achievable diffraction efficiency for neutrons. As a solution to this problem, the Pendellosung interference effect in holographic gratings has been exploited to reach a diffraction efficiency of 83% for very cold neutrons.
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| 3. |
- Krzywda, Anna, et al.
(författare)
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Sclerotia of the acellular (true) slime mould Fuligo septica as a model to study melanization and anabiosis.
- 2008
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Ingår i: Cellular & molecular biology letters. - : Walter de Gruyter GmbH. - 1689-1392. ; 13:1, s. 130-43
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Tidskriftsartikel (refereegranskat)abstract
- Acellular (true) slime moulds (Myxomycetes) are capable of a transition to the stage of sclerotium - a dormant form of plasmodium produced under unfavourable environmental conditions. In this study, sclerotia of Fuligo septica were analyzed by means of electron paramagnetic resonance (EPR) spectroscopy. The moulds were cultivated in vitro on filter paper, fed with oat flour, and kept until the plasmodia began to produce sclerotia. The obtained sclerotia differed in colour from yellow through orange to dark-brown. The EPR spectra revealed a free radical, melanin-like signal correlated with the depth of the colour; it was strongest in the dark sclerotia. Sclerotization only took place when the plasmodia were starved and very slowly dried. Only the yellow sclerotia were able to regenerate into viable plasmodia. This suggests that myxomycete cytoplasm dehydration is an active process regulated metabolically. Plasmodial sclerotization may therefore serve as a convenient model system to study the regulation of cytoplasmatic water balance, and sclerotia as a convenient material for EPR measurements, combining the quality of plasmodia with the technical simplicity of the measurements characteristic of dry spores. Darkening of the sclerotia is most probably a pathological phenomenon connected with the impairment of water balance during sclerotization.
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