Sökresultat

Accelerator mass spectrometry (AMS) is a world-wide spread technique and nearly 50 AMS laboratories exist today. The most widely spread application of AMS is for radiocarbon dating and an estimated total of nearly 100000 ¹⁴C samples are measured per year. Other isotopes used are ¹⁰Be, ²⁶Al, ³⁶Cl, ⁴¹Ca, ¹²⁹I. The number of these meas

The location of lipoprotein lipase activity in rat adipose tissue was studied using intact epididymal fat pads, isolated adipocytes, and lipoprotein lipase activity secreted from adipocytes as enzyme sources. The enzyme activities of these preparations were characterized by gel filtration. The method used for isolation of adipocytes had been modified to minimize activation of lipoprotein lipase du

The different roles played by small and large eddies in engine combustion were studied. Experiments compared natural gas combustion in a converted, single cylinder Volvo TD 102 engine and in a 125 mm cubical cell. Turbulence is used to enhance flame growth, ideally giving better efficiency and reduced cyclic variation. Both engine and test cell results showed that flame growth rate correlated best

Aims: Many lymphoma patients have both macroscopic tumors and single-cell manifestations of their disease. Treatment efficacy could, therefore, depend on the radionuclide used. The aim of this study was to investigate dosimetry at a cellular level for three isotopes of radioiodine. Methods: Cells were assumed to be spherical with radii of 6.35, 7.7, and 9.05 mu m corresponding to the dimensions of

A feature that distinguishes extreme-value contexts from more conventional statistical problems is that in the former we often wish to make predictions well beyond the range of the data. For example, one might have a 10-year sequence of observations of a phenomenon, and wish to make forecasts for the next 20 to 30 years. It is generally unclear how such long ranges of extrapolation affect predicti

The crystallization of a key enzyme from Aquifex aeolicus with suggested bifunctional activity, acting as an exopolyphosphatase and a guanosine pentaphosphate phosphohydrolase, is reported. Native data were collected to below 2 A resolution from an orthorhombic crystal with unit-cell parameters a = 50.8, b = 70.3, c = 90.9 A. Methionine residues were introduced by mutation and deliberate oxidation

Chemically skinned guinea pig taenia coli fibre bundles showed a concentration-dependent decrease in width when incubated in media containing Dextran T500 (0-0.2 g ml-1). The maximal reduction in width, observed at 0.2 g ml-1 dextran, was 32%. The effect was reversible upon removal of dextran. Isometric force was slightly increased (about 10%) at the lowest dextran concentration (0.025 g ml-1) but

Biomass gasification for energy or hydrogen production is a field in continuous evolution, due to the fact that biomass is a renewable and CO2 neutral source. The ability to produce biomass-derived vehicle fuel on a large scale will help to reduce greenhouse gas and pollution, increase the security of European energy supplies, and enhance the use of renewable energy. The Varnamo, Biomass Gassifica

In her widely cited and criticised Gender trouble, Judith Butler (1990) elaborated the thought that gender needs to be understood as performative – a certain kind of doing behind the bars of a hegemonic heterosexual imperative that governs intelligible bodily configurations. Drawing mainly on psychoanalytical and foucauldian arguments, Butler dwells upon numerous important questions concerning pow

I en ny stor, randomiserad interventionsstudie (ADVANCE) har man med aktiv behandling (perindopril/indapamid) jämfört med placebo nu fått otvetydiga resultat som visar att en skärpt blodtryckssänkning hos typ 2-diabetiker ger kliniska vinster. Vid en genomsnittlig tryckskillnad på 5,6/2,2 mm Hg (med ett medelblodtryck på 135/78 mm Hg i aktiva gruppen vid studiens slut) uppnåddes signifikanta effek

Background. There is an ongoing controversy regarding how to take care of patients with mild primary hyperparathyroidism (PHPT) and how to grade their disease activity in terms of bone parameters. This prospective and randomized study was undertaken to evaluate skeletal effects of delayed surgical treatment in such patients. Methods. Fifty patients with mild PHPT (serum calcium, 2.55 to 2.95 mmol/

Techniques for estimation of element levels directly in humans (noninvasive in vivo) or in samples (in vitro) from humans are reviewed. Toxic, nonessential, trace elements may cause temporary or permanent damage to various organs and tissues in humans. There is thus a need to control the concentrations. Knowledge of the relations between toxic effects and element concentration may be extracted fro

Abstract is not available

Two hundred apparently healthy sexually active women, 17-34 years of age, who had presented for a general health check-up at the Clinic of Dermatology and Venereology, Medical University, Plovdiv, Bulgaria, were asked about genital symptoms, sexual behaviour, contraceptive use and smoking habits, and examined for signs of genital infections. They were searched for genital chlamydial infection, gon

We present a unified approach for calculating the properties of shallow donors inside or outside heterostructure quantum wells. The method allows us to obtain not only the binding energies of all localized states of any symmetry, but also the energy width of the resonant states which may appear when a localized state becomes degenerate with the continuous quantum well subbands. The approach is non

Popular Abstract in Swedish Denna studie handlar om sysselsättningsintegrationen av manliga och kvinnliga invandrare i Sverige mellan 1970 och 1995. Första kapitlet inleds med en översikt av teorier och tidigare studier om invandrares sysselsättning. Utifrån denna formuleras ett antal hypoteser. Det andra kapitlet ger en översikt av den svenska migrationshistorien, invandrarnas karaktäristika samtThis study deals with the employment integration of immigrant men and women in Sweden between 1970 and 1995. The first chapter starts with a review of theory and previous studies on immigrant employment and from this a number of testable hypotheses are framed The second chapter gives an overview of Swedish immigration history, the composition of the immigrant population and the economic background

Abstract is not available