The influence of different types of surfactants on ultrafiltration membranes has been investigated. A basic approach to membrane-surfactant interactions is also presented. A nonionic (Triton X-100), two anionic (potassium oleate and sodium dodecylbenzenesulphonate) and a cationic (hexadecyltrimethylammonium bromide) surfactant were investigated. The effects on commercial membranes of polysulphone,

Popular Abstract in Swedish Möjligheten att använda tillförlitlighetsteori som ett verktyg för utvärdering av säkerhet och återstående livslängd av skadade konstruktioner har undersökts. Det framkommer att tillgängliga riktlinjer och stödjande dokument är öppna för tolkningar och detta leder till resultat med oacceptabla skillnader. Tolkningar förkommer även vid deterministiska beräkningar men tilA feasibility study of reliability theory as a tool for the assessment of present safety and residual service life of damaged concrete structures has been performed in order to find a transparent methodology for the assessment procedure. It is concluded that the current guidelines are open to interpretation and that the variation in the results obtained regarding the structural safety is too grea

0 Context.-Plasma anti-Xa and anti-IIa activities correlate with the dose of low-molecular-weight heparin, and D-dimer and thrombin-antithrombin complexes are markers of procoagulant activity. Objective.-To investigate the relationship between plasma coagulation parameters and patient characteristics, including renal function, thromboprophylaxis, and incidence of venous thromboembolism (VTE) in th

Absorption and fluorescence spectra of 2-R-5-phenyl-1,3,4-oxadiazoles (R = H, methyl, tert-butyl, trifluoromethyl, amino, phenyl, benzyl) were studied experimentally and by time dependent density functional theory (TDDFT) methods. In acidic media a substantial red shift is observed due to the presence of conjugate acid forms. Two conjugate acid forms (3H and 4H) are possible for unsymmetrically su

An enantioselective synthesis of (-)-pregaliellalactone (1), a biosynthetic precursor of the potent fungal metabolite ( -)-galiellalactone (3) produced by several ascomycetes, is reported. When fed to a culture of Galiella rufa, 1 was efficiently converted to 3. (C) 2002 Elsevier Science Ltd. All rights reserved.

Human cancers are characterized by chromosomal aberrations, and an increasing number of specific balanced rearrangements have been found among malignant hematologic disorders. Most solid tumors, however, exhibit a much more complex cytogenetic pattern. Although these chromosome changes show a nonrandom distribution, tumor-specific aberrations are uncommon, and the solid tumors often contain a larg

Neutron deficient (98)pd nuclei were produced in the Cr-50(Ni-58,2p2 alpha)(98) Pd reaction at a beam energy of 261 MeV. A revision and extension of the level structure of (98)pd is proposed. About 40 new transitions have been assigned to, and placed in the level scheme of this nucleus. A sequence of states are candidates for the negative parity 4-quasiparticle states built on the pi g(9/2)(-3)pi

Popular Abstract in Swedish I denna avhandling ställs frågan varför unga människor vill bli konstnärer och vilken mening det konstnärliga skapandet kan tänkas ge dem. En grupp unga konstelever har intervjuats och för var och en av de intervjuade är konstens mening högst personlig samtidigt som mening också skapas i den konstnärliga gemenskap eleverna ingår i. Författaren vill försöka förstå både dThis dissertation explore young peoples will to become artists. A group of artstudents have been interviewed and severel questions are raised. How do the students perceive their artistry and their role as artists? In what way is artistic creation meaningful to them? What does the relationship between the individual project of becoming an artist and their societal participation look like? As artist

Heavy-ion collisions at high energies calls for new technical solutions to cope with the very high multiplicities of produced particles. In this thesis the design and development of two types of tracking chambers for high multiplicity environments are presented. The first type was developed to be a part of the tracking system of the WA98 experiment. The tracking chambers were designed to provide

The electrostatic properties of charged surfactant micelles are investigated through titrations of fatty acid probes solubilized in the micelles. The titration process is followed by means of calorimetric measurements and by determining the pH values as a function of added base. This approach yields a complete thermodynamic description of the titration process. In particular, we find that the proc

Deficiency of the anticoagulant vitamin K-dependent protein S (PS) is associated with increased risk of venous thrombosis. In human plasma, PS circulates in two forms: as free protein (free PS) and PS bound to C4b-binding protein (C4BP), a regulator of the complement system. Assays for free PS have higher sensitivity and specificity for protein S deficiency than assays for total protein S. We have

Fuel cells in combination with hydrogen are expected to play an important role in a future, sustainable transport system. Recent studies have provided insight into how technological transitions may come about and may be I managed. However, there is a lack of methodologies aimed at starting off transitions or system innovations, in practice. This paper addresses this issue by presenting a methodolo

Xylose fermentation performance was studied of a previously developed Saccharomyces cerevisiae strain TMB 3057, carrying high xylose reductase (XR) and xylitol dehydrogenase (XDH) activity, overexpressed non-oxidative pentose phosphate pathway (PPP) and deletion of the aldose reductase gene GRE3. The fermentation performance of TMB 3057 was significantly improved by increased ethanol production an

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