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Background: The tuberculin skin test is used for tracing of tuberculosis transmission and identifying individuals in need of prophylactic treatment. Methods: Using a case-control study design, we recruited 220 smear-positive tuberculosis cases and 223 randomly selected healthy community controls in Bissau, Guinea-Bissau, during 1999-2000. Tuberculin skin tests were performed on family members of c
In anaerobic digestion (AD), the production of short-chain fatty acids (SCFAs) can be beneficial or harmful to the overall process, depending on the concentration of accumulated acids. Therefore, the accurate determination of the SCFA concentration in both fresh and stored sludge hydrolysates is important. To select a suitable method for monitoring SCFAs during the AD of sewage sludge, the accurac
The fundamentals of analyte extractable fraction, solubility, partitioning and mass transfer resistance in supercritical fluid extraction were studied using inverse modeling. These phenomena are essential for understanding, predicting and optimizing the supercritical fluid extraction process. Carotenoids, chlorophyll A, ergosterol and total lipids were extracted from the microalgae Chlorella sp. T
Kraft lignin was used to formulate adhesives in combination with polyethyleneimine, chitosan and soy protein, respectively. The tensile strengths of bond lines formulated with laccase-treated and untreated lignin were found to be similar. However, a remarkable difference was noted when laccase-treated lignin was reduced by sodium borohydride prior to reacting either with chitosan or soy protein -
Background. Angiogenesis has a key role in several conditions and is regulated by several factors such as the platelet-derived growth factor (PDGF) or the vascular endothelial growth factor (VEGF). The goal of this study was to investigate the possible role of PDGF and VEGF in a group of patients with severe food allergy. Methods. We design a prospective longitudinal study (n = 30) with patients w
Denna uppsats behandlar utkontrakteringar i offentlig sektor och som praktikfall har utkontrakteringen av äldreboendena Nibblegården och Ärtan i Lunds kommun valts. Själva syftet med uppsatsen är att få en uppfattning om vilka effekter som uppkommer vid utkontrakteringar. I uppsatsen diskuteras även vad som bör beaktas vid utkontrakteringsbeslut (eller återtagande av utkontrakterad verksamhet). De
A comparative study of the antioxidant activity of hydroxytyrosol (HT) and phosphatidyl derivatives of hydroxytyrosol (PHT) added at increasing concentrations to diverse edible oils (lard oil, refined olive oil, and diacylglycerol-rich oil) was performed. Antioxidant activity index was estimated as the ratio of induction time in presence of the compounds to induction time in their absence, after o
The present dissertation concerns typologically unusual ways of encoding manner information, namely verbal affixes (manner affixes), incorporated constituents (incorporated manner modifiers) and auxiliary verbs (manner adverbial verbs). A key proposal is that all three are overt realizations of syntactic heads merged in the clausal spine, thereby presenting novel data that can be used to probe int
The long-term culture of human embryonic stem (ES) cells is inevitably subject to evolution, since any mutant that arises with a growth advantage will be selectively amplified. However, the evolutionary influences of population size, mutation rate, and selection pressure are frequently overlooked. We have constructed a Monte Carlo simulation model to predict how changes in these factors can influe
Propionic acid (PA) production from agro-industrial residues using propionibacteria has gained interest as an alternative to fossil-based process. Microbial production is however characterized by product inhibition, lowering the product titers and productivity. In this study, Propionibacterium acidipropionici DSMZ4900 was subjected to adaptive evolution to tolerate higher acid concentrations. The
Neoliberal and conservative actors, financed by the fossil fuel industry, have been identified as crucial parts of a climate change denialist counter movement since at least the 1980s. We claim that this intersection stems from more than just vested interest fuelling advocacy groups. By focusing on the intellectual developments and social networks of core actors in the environmental debate in Swed
The building industry has a major impact on the global carbon emissions, the use of natural resources and generation of waste. A drastic change is needed for this industry to be a part of a sustainable future. Within this research, a case study is performed to investigate how cultural values of a building can be preserved when energy efficiency measures are taken, with a low global warming potenti
This thesis defines the finite projective plane and the affine projective plane. A method of construction is defined for the field planes by extension of the affine plane constructed from the vector space over a finite field. The thesis explores for which orders planes can and cannot be constructed, in particular, for the prime powers there exist planes. For n=6 a computer search is conducted usin
This thesis identifies and evaluates business model alternatives for Oceanbird’s Wing 560 rigid sail, a wind-assisted ship propulsion technology approaching broader commercialisation. The shipping industry’s complex ownership structures create split-incentive problems that complicate investment in fuel-saving technologies, making the choice of business model a strategic decision. Furthermore, the
Shopping malls are becoming more prevalent throughout the world. They have been identified as having high energy use, which is less explored than other building types. There are 357 shopping centers in Sweden, which has doubled in the last five years. Regardless of national differences in shopping mall tenants' demands, shopping malls always tend to have high lighting loads, high population de
The climate impact of food production plays a big part in the anthropogenic climate impact. Mitigation strategies from this sector are hence of great importance. One area which mainly has been used to calculate climate impact is albedo, the overall reflectance of incoming radiation in all directions. Albedo has been measured for a long time and is vital when calculating the energy balance of an a
The thesis main objective is to establish the determinants for granting executive stock options and to examine their impact on performance for firms listed on OMXS30. The analysis is based on accounting data gathered from annual reports and Thomson Datastream. The empirical results display that firms grant stock options to mitigate the principal-agent problem. Furthermore, risk proves to be positi
Air pockets in pressurized pipelines may reduce hydraulic capacity, increase head losses, and affect system operation. In downward sloping pipe sections, a key question is whether the water flow can transport a trapped air pocket downstream or whether the air is likely to remain stationary, which would require an air valve to evacuate the air. This thesis compares selected criteria and guidance so
There is no apparent need for individuals to endure this kind of suffering in contemporary Western society with all its advantages. Nevertheless, endurance running is now a mainstream leisure pursuit. Why do hundreds of thousands of men, women and even children choose this torturous kind of leisure activity?In previous literature on consumption of extraordinary experiences, authors focus on the pu
