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Photosynthesis in light which is so weak that excitation rates are comparable to the decay rates of S-states is modelled. It is found that oxygen evolution rate varies in a non-linear way with Photosystem II excitation rate in this region, but asymptotically approaches a linear relationship (with a slope of one oxygen molecule per four excitations) as excitation rate increases. The asymptote gives
Dramatic swings in the North Atlantic oscillation (NAO) during the 1990s motivated the authors to build a statistical model of NAO impacts on hydropower production and energy markets in Scandinavia. Variation in the NAO index is shown to explain 55% of the variance of streamflow in Norway and up to 30% of the variance in Norway's hydropower output. It is also possible to identify the influence of
In the study of economic-geographic structures, the shifting focus from the national state to the city and its region has highlighted the lack of reliable interurban data sets. The abundance of usable data sets on international structures and ?ows has no counterpart when studying interurban relations, which makes it hard to draw any extensive conclusions regarding the structure of world city netwo
Advancing on preliminary research, the aim of this work was to further study how partial air dehydration applied to fruit pieces before freezing, alone or in combination with osmo-dehydration, could improve not only quality of strawberry slices used in yogurt preparation but also yogurt characteristics. Raw (NT), air-dehydrated (D), and osmo-air-dehydrated (OD) strawberry slices (cv. Tethis) were
Much attention is now being paid to health and nutrition claims for foods. There are already many food products on the market with claims appealing to consumers about health effects beyond provision of basic nutrients. One important basis for claims is the increasingly documented effect of dietary components on body functions. There are three main reasons for assessing the scientific substantiatio
The results of primary hip replacements are good. However, dealing with a loose prosthesis has been problematic, especially when major bone deficiencies are encountered. These problems appear to have been solved by the introduction of the Slooff-Ling method of using morselized and impacted allograft chips. The clinical results are excellent in the hands of the innovators. However, it remains confu
Objective: To develop evidence-based recommendations for the management of systemic glucocorticoid ( GC) therapy in rheumatic diseases. Methods: The multidisciplinary guideline development group from 11 European countries, Canada and the USA consisted of 15 rheumatologists, 1 internist, 1 rheumatologist-epidemiologist, 1 health professional, 1 patient and 1 research fellow. The Delphi method was u
Popular Abstract in Swedish Den moderna tekniken att operera förslitna höftleder infördes av John Charnley i England på 1960-talet. Lårbenshuvudet ersattes med en metallkula på ett skaft och ledhålan på bäckenbenet med en skålformad plastkomponent. Bägge komponenterna sattes fast med en härdande plast, s.k. bencement. I början uppstod komplikationer med infektioner eller brott i själva protesen. DThis thesis focuses on the healing and remodeling of the morselized and impacted bone allograft, commonly used in revision of loosened hip prostheses with osteolysis. The influence on remodeling by the impaction procedure per se was analyzed, as well as the effects of endogenous bone graft proteins, and an exogenously applied growth factor (OP-1). A bone chamber model in rats was used, with the in
Phenotypic plasticity may enable organisms to optimize their phenotypes in environments that are heterogeneous over time or space. For example, inducible defenses are favored for prey populations faced with variable predation risk. We studied the impact of brook trout (Salvelinus fontinalis) on the development of defensive morphological characters in larvae of the mayfly, Drunella coloradensis, bo
Popular Abstract in Swedish Två observationer tjänar som utgångspunkt för denna avhandling: (1) globaliseringens allt snabbare och mer eller mindre gränslösa flöde av information har medfört ökad press på företag och organisationer, liksom stater och regioner, att ständigt förnya sig för att kunna behålla sin konkurrenskraft. (2) kunskapsintensiv industri tenderar att samlas i geografisk närhet tiThe accelerated speed and intensity of global interconnections in all segments of society during the last couple of decades have had a profound impact on the workings of contemporary capitalism. Increased pressure is put on national and regional economies to continuously upgrade their competitive advantages, at the same time as new learning opportunities occur at a faster rate than ever. For reaso
We have performed Monte Carlo simulations of the electron drift velocity in a delta-doped Si/SiGe quantum well, for high and low temperatures as well as strong and weak electric field. All scattering matrix elements of intervalley phonons, acoustic phonons, interface roughness, and impurity ions are calculated from the electron wave functions. Special attention was paid to the resonant state scatt
An investigation was undertaken to outline how microorganisms suggested for use in coal desulphurization are affected by compounds leached from coal. Three species of the genus Sulfolobus were studied. Sulfolobus acidocaldarius was seen to be affected by compounds leached from coal more negatively than Sulfolobus brierleyi and Sulfolobus solfataricus. It was observed that certain conditions during
Glucagon- like peptide-1 ( GLP-1) plays a significant role in glucose homeostasis through its incretin effect on insulin secretion. However, GLP-1 also exhibits extrapancreatic actions, and in particular its possible influences on insulin sensitivity are controversial. To study the dynamic action of GLP-1 on insulin sensitivity, we applied advanced statistical modeling methods to study glucose dis
Serum-depleted human foetal skin fibroblasts were stimulated by addition of 10% foetal calf serum to proliferate synchronously for at least one cell cycle. This proliferation was suppressed by leukocyte or fibroblast interferon (IF), which prolonged the G1 phase and diminished the rate of DNA synthesis during the S phase in a dose-dependent manner. When used in identical concentration, as judged i
When plant tissue is wounded a number of protective processes start. We have made a study by isothermal calorimetry of the heat production response of root and tuber tissue to wounding. Samples with different surface to volume ratios were prepared from carrots, potatoes and swedes (rutabaga) and the thermal power was measured in closed glass ampoules in a TAM Air isothermal calorimeter. The evalua
