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Natural food webs are embedded in a variable environment, which causes population densities to fluctuate, despite a potential stable equilibrium. Population interactions as well as the characteristics of the environmental fluctuations determine the resulting population dynamics. Populations sensitive to the same kind of environmental disturbances will show correlated responses in their respective
Purpose We tested whether total prostate-specific antigen velocity (tPSAv) improves accuracy of a model using PSA level to predict long-term risk of prostate cancer diagnosis. Methods During 1974 to 1986 in a preventive medicine study in Sweden, 5,722 men aged <= 50 gave two blood samples about 6 years apart. We measured free (fPSA) and total PSA (tPSA) in archived plasma samples from 4,907 partic
An on-board measurement system has been developed that in real time identifies the probability for occurrence and also the exact location of severe wear in the wheelrail contact. Noise generated by the wheel-rail contact is a troublesome side effect both when railway vehicles negotiate curves and run on straight tracks. The concept behind this project is to use this noise as an indicator of the tr
State reforms adopted in the 1680s prevented the largest copperworks in the Oldenburg Monarchy, Røros, from shutdown. The changes ensured supply deliveries and regular wage payments through spread of ownership, delegating more responsibilities to the Director and managers and introducing complex control mechanisms and state monitoring of the accounts and daily tasks. They appear relatively advance
Purpose: The aim of this study was to determine the time at which physeal arrest is achieved after percutaneous physiodesis, and whether immediate postoperative growth rate affects the time to reach physeal arrest. Methods: Radiostereometric analysis, with implantation of tantalum balls as radiographic markers on each side of the physes, was used to measure residual longitudinal growth in 21 child
After Tony Blair resigned as the United Kingdom’s prime minster in June 2007, he was appointed as the official envoy of the Quartet on the Middle East. His appointment was marred with controversy not the least with regard to his suitability for the role and his performance as peace envoy, with many observers questioning his ethical credentials. The EU along with the US, Russia and the UN make up t
Apolipoprotein E (ApoE), a cholesterol transporter and an immunomodulator, is brain protective after experimental stroke and implicated in brain repair. Here, we study the involvement of ApoE in the restoration of brain function after experimental stroke, by using animal housing conditions that differentially improve recovery after occlusion of the middle cerebral artery occlusion (MCAO). We found
Purpose: To investigate initial learning curves on a virtual reality (VR) eye surgery simulator and whether achieved skills are transferable between tasks. Methods: Thirty-five medical students were randomized to complete ten iterations on either the VR Caspulorhexis module (group A) or the Cataract navigation training module (group B) and then two iterations on the other module. Learning curves w
This thesis has the constructive aim of analyzing the European Commission's normative expectations on European citizens and exploring the prerequisites for their realization. To this purpose, three main perspectives in citizenship theory, liberalism, republicanism and communitarianism are used in the analysis of official Commission documents. The main sources are the regularly published Citize
The Supreme Court declared §4(b) of the Voting Right Act (1965) unconstitutional in the case of Shelby County v Holder 570 U.S. in 2013. This is a recent decision regarding disenfranchisement towards African Americans which ends up not protecting the civil rights of all American citizens. Discrimination is nothing new in the United States but has become institutionalized over time which makes it h
Objectives: There is growing concern regarding waiting times in health care as a mechanism to improve fairness in health services. This essay addresses the issue by evaluating fairness defined by justice theories. Based on this discussion, the essay then investigates whether actual waiting times are consistent with ethical principles. Theory: The theories of justice discussed are utilitarianism, e
We have studied the kinetics of the solubilization of oil through a temperature jump into a droplet microemulsion phase in the system water-pentaethylene oxide dodecyl ether-decane at 25 C. The initial state is formed by subjecting the equilibrium system at 25 C to a temperature quench to 22, 20, and 14 C, respectively. At this lower temperature, which at equilibrium corresponds to a two-phase sys
Abstract Co-operation difficulties in the work place can be a problem serious enough. Co-operation difficulties can occur between employee and employer, as well as employees among themselves. Irrespective of between which individuals the co-operation difficulties occur, it will have negative consequences. These can consist of, for example that individuals might suffer mentally, inproductivity and
As authorities, the universities are subject to the principle of access to official documents. Records generated during the research process are thus to be regarded as official documents, even though there are disputes over exactly when they are to be considered as such. Scientists are, to various degrees, dependent of access to earlier research data, which may have been collected during research
We have studied the use of complimentary alternative medicine (CAM) among 233 consecutive breast cancer patients operated on at the Lund University Hospital, Sweden between 2002 and 2004. Questionnaires were administered preoperatively (n = 233), and again 3-6 months post-operatively (n = 167) and one year after surgery (n = 88). At baseline, 14,5% used CAM, 3-6 months post-operatively 14,4% used Bruket av naturläkemedel och andra faktorer som kan interagera med behandling av bröstcancer kartläggs i en pågående studie hos bröstcancerpatienter i Lund; i artikeln redovisas basdata för 233 patienter. Vid inskrivningen använde totalt 14,5 procent av patienterna naturläkemedel, vid 1-årskontrollen 18,2 procent. Sammanlagt 35 olika preparat användes, varav soja och övriga fytoöstrogener, vitlök,
The objective of this thesis was to find ways of improving part-load efficiency for a spark ignition engine by studying the effects of variable-valve actuation on fluid flow and combustion. The in-cylinder flow was measured with laser doppler velocimetry, LDV, and particle image velocimetry, PIV. A piezo-electric pressure transducer was used to measure the in-cylinder pressure, which was used for
Solar Assisted Pervaporation (SAP) is a novel technique of preservation that combines the concept of membrane separation and the use of solar energy. The method uses a ‘breathable pouch’ with an active layer of a food-grade hydrophilic membrane. The aim of this study was to understand how different drying temperatures (50oC and 60oC), air exclusion treatment (with and without vacuum) and type of
