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The capacity of somatic cells and pollen grains or microspores to undergo embryogenesis is an important property used in improvement and regeneration of plants. Furthermore, somatic embryogenesis as well as pollen embryogenesis show many similarities with zygotic embryogenesis and are, thus, good model systems. Pollen suspensions of tobacco (Nicotiana tabacum L.) contain a mixture of embryogenic a
It is of great interest and importance how different amino acid residues contribute to and affect the properties of a protein surface, Partitioning in aqueous two-phase systems has the potential to be used as a rapid and simple method for studying the surface properties of proteins. The influence on partitioning of the surface exposed amino acid residues of eight structurally determined monomeric
Popular Abstract in Swedish Varför beslutar politiker ibland att vidta till synes effektlösa åtgärder? Varför uppstår ibland stora politiska konflikter i små frågor? I vanliga fall vidtar man en politisk åtgärd därför att man eftersträvar det konkreta resultatet av åtgärden. Symbolpolitik är när en politisk fråga blir viktig, inte beroende på vad den konkret innebär och leder till, utan på grund aSymbolic politics is the degree to which political decision-making is motivated, not by the tangible aspects of the decision, but by the interpretation of what the decision represents symbolically. While symbolic politics is widely recognized as an important aspect of political decision-making, the phenomenon is insufficiently explored in political science. The first aim of the present dissertatio
The vegetation history of the Faroe Islands has been investigated in numerous studies all broadly showing that the early-Holocene vegetation of the islands largely consisted of fellfield with gravely and rocky soils formed under a continental climate which shifted to an oceanic climate around 10,000 cal yr BP when grasses, sedges and finally shrubs began to dominant the islands. Here we present da
The recent and fossil pollen data obtained under the frame of the multi-disciplinary international El'gygytgyn Drilling Project represent a unique archive, which allows the testing of a range of pollen-based reconstruction approaches and the deciphering of changes in the regional vegetation and climate. In the current study we provide details of the biome reconstruction method applied to the late
Relief Aid in East Africa Over a period of six months during second half of 2011, the global humanitarian Community responded to one of the most severe droughts the world has ever seen. A total of 13 million people were given emergency assistance including food, water and shelter. Unfortunately, this intervention is not an isolated event. The countries located in East Africa have a dire history of
Logistics is gaining increased attention in companies since interconnectivity is increasing, and the interdependence among actors is enhanced due to challenges organizations are facing today (market changes, novel strategies, and technological improvements). While the logistics discipline has been characterized by an efficiency focus based on positivistic assumptions, the challenges of today requi
DescriptionThis thesis consists of two papers. The first gives a game-theoretical treatment of the institutional homogenization of value-oriented firms. It explains why intrinsically motivated, value-oriented firms like non-profits may become similar to for-profit firms in terms of organization and norms. It highlights and explains the pairs: value-oriented and flat organizations in contrast to va
During the prolonged course of chronic viral infection there is a continuous reciprocal interaction between the host immune defence system and the viral immunogens, and viral genetic mutations capable of circumventing host immune defence could be selected for. Our observation of increasing prevalence of heterogeneity in the DNA sequence coding for the ‘a1 determinant of HBsAg in patients with pres
Popular Abstract in Swedish Av de omkring 45 000 svenskar som årligen drabbas av cancer kommer ungefär hälften att botas, ofta med strålning som en del av behandlingen. Syftet med strålterapi är att oskadliggöra tumören, men utan att skada omgivande vävnad. Idealt vill man att stråldosen ska vara mycket hög i tumören, samtidigt som den är obefintlig i vävnaden runt omkring. Strålskador på frisk väIn many radiotherapy applications, true three-dimensional dosimetry with good spatial resolution that can be achieved in a single measurement would be of great value. Polymer gel dosimetry fulfils many of the demands on such a system. In this study, methods to facilitate the implementation of gel dosimetry have been investigated. A new type of polymer gel, for which the response to absorbed dose i
Surface display in insect cells: Systems available for surface display that utilize bacterial phages are insufficient for displaying a number of eukaryotic proteins. By instead presenting proteins on the surface of eukaryotic cells or virus, some of these problems might be overcome. The baculovirus/insect cell system, which has a high expression rate and post-translational mashinery closely resemb
Coastal flooding and erosion are worldwide problems that are further aggravated by rising sea levels and increasing population densities in coastal areas. In many of those areas, sandy beaches and dunes protect thehinterland from waves and extreme water levels during storms, while providing natural and recreational values. Sandy coasts are dynamic systems. Thus, risk assessments and coastal manage
Objective: Subjective cognitive decline (SCD) is associated with an increased risk of Alzheimer's Disease (AD). Early disease processes, such as amyloid-β aggregation measured with quantitative PET, may help to explain the phenotype of SCD. The aim of this study was to investigate whether quantitative amyloid-β load is associated with both
Popular Abstract in Swedish Det finns i Sverige idag över 100 000 personer vilka överlevt insjuknande i stroke (blodpropp eller blödning i hjärnan). Varje år inträffar ca 20 000 ? 25 000 nyinsjuknanden och ca 5 000 - 10 000 återinsjuknanden i stroke. Vanliga symtom både vid det akuta insjuknandet, och senare efter genomgången akutsjukvård och rehabilite-ring, är förlamningar, talrubbningar, sväljnThe aims were to follow stroke patients over time with respect to general pain, shoulder pain, weight loss, and health related quality of life (HRQOL), the latter also in stroke survivors' informal caregivers. Methods During a 1 year period, 416 first-ever stroke patients were included in the population based Lund Stroke Register; 327 survivors were followed up after four months and 305 one year
Background: Migration from Thailand to Sweden has increased threefold over the last 10 years. Today Thailand is one of the most common countries of origin among immigrants in Sweden. Since the year 2000, new HIV cases are also more prevalent among Thai immigrants compared to other immigrant nationalities in Sweden. The purpose of this study was to investigate the association between knowledge and
Objectives To study the impact of time in therapeutic range (TTR) and international normalised ratio (INR) variability on the risk of thromboembolic events, major bleeding complications and death after mechanical heart valve (MHV) implantation. Additionally, the importance of different target INR levels was elucidated. Methods A retrospective, non-randomised multicentre cohort study including all
Objectives: Atrial fibrillation has been associated with increased mortality in the general population and mixed populations of critical ill. Atrial fibrillation can also affect patients during post-cardiac arrest care. We sought to assess the prognostic implications of atrial fibrillation following out-of-hospital cardiac arrest, including relation to the level of targeted temperature management.
Background. Knowledge on the globally outstanding Amazonian biodiversity and its environmental determinants stems almost exclusively from aboveground organisms, notably plants. In contrast, the environmental factors and habitat preferences that drive diversity patterns for micro-organisms in the ground remain elusive, despite the fact that micro-organisms constitute the overwhelming majority of li
Aim/Purpose The goal of this paper is to examine digital applications used in Swedish schools and whether they fulfill their potential as support for learners. This is done by examining the kinds of feedback they provide and discussing if this feedback supports learning or not. Background The paper targets one aspect regarding which educational apps can be of high value for learners and teachers,
Accurate determination of the genetic diversity present in the HIV quasispecies is critical for the development of a preventative vaccine: in particular, little is known about viral genetic diversity for the second type of HIV, HIV-2. A better understanding of HIV-2 biology is relevant to the HIV vaccine field because a substantial proportion of infected people experience long-term viral control,
