Open Access Theses - Social Sciences and Humanities - 2011-2020

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  • Publication
    The phenomenological experiences of Autobiographical Memory: A cross-sectional and a longitudinal study
    ( 1984)
    Luchetti, Martina
    Phenomenology is a critical component of autobiographical memory retrieval. Some memories are vivid and rich in sensory details whereas others are faded; some memories are experienced as emotionally intense whereas others are not. Sutin and Robins (2007) identified 10 dimensions in which a memory may vary—i.e., Vividness, Coherence, Accessibility, Sensory Details, Emotional Intensity, Visual Perspective, Time Perspective, Sharing, Distancing, and Valence—and developed a comprehensive psychometrically sound measure of memory phenomenology, the Memory Experiences Questionnaire (MEQ). Phenomenology has been linked to underlining stable dispositions—i.e. personality, as well as to a variety of positive/negative psychological outcomes—well-being and life satisfaction, depression and anxiety, among others. Using the MEQ, a cross-sectional and a longitudinal study were conducted on a large sample of American and Italian adults. In both studies, participants retrieved two ‘key’ personal memories, a Turning Point and a Childhood Memory, and rated the affect and phenomenology of each memory. Participants also completed self-reported measures of personality (i.e. Neuroticism and Conscientiousness), and measures of depression, well-being and life satisfaction. The present research showed that phenomenological ratings tend (a) to cross-sectionally increase across adulthood (Study 1), and (b) to be moderately stable over time, regardless the contents of the memories (Study 2). Interrelations among memory phenomenology, personality and psychological outcome variables were also examined (Study 1 and Study 2). In particular, autobiographical memory phenomenology was proposed as a dynamic expression of personality functioning that partially explains adaptive/maladaptive psychological outcomes. In fact, the findings partially supported the hypothesized mediating effect of phenomenology on the personality association with psychological outcomes. Implications of the findings are discussed proposing future lines of research. In particular, the need for more longitudinal studies is highlighted, along with the combined application of both self-report questionnaires and narrative measures.
  • Publication
    Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land
    ( 2011)
    Johannesson, Karin
    Seven wetlands, constructed on agricultural land in the south of Sweden, were investigated with respect to phosphorus (P) retention. The overall aim was to increase the understanding of P retention and find possible explanations for the variations in retention that have been observed in previous studies. This was done by i) investigating P retention in wetlands receiving various water and P loads, ii) investigating the effect of variations in water flow on P transport, iii) comparing how well retention estimates based on water quality data agreed with measurements of the amount of P accumulated in the sediment. Results showed that P retention was positive in all wetlands, but it was variable (1–58 kg ha-1 yr-1) and months with negative retention were observed in nearly all wetlands. Such monthly negative retention coincided with i) high flow periods, when particulate P was either flushed straight through the wetlands or resuspended from the bottoms, and ii) warm low flow periods, in which case dissolved P was probably released from wetland sediments due to anoxic conditions. The results from the two methods for estimating P retention differed. Based on water quality data, the total P load during four years was 65 kg ha-1 and the mean P retention 2.8 kg ha-1 yr-1, or 17% of the total P load. In contrast, the amount of P accumulated in the inlet zone alone amounted to 78% of the P load, and the P content in the upper sediment of the whole wetland area exceeded the P load with a factor four. This discrepancy showed the need to add studies of sediment accumulation to inflow-outflow estimates for an improved understanding of wetland P retention.
  • Publication
    A Comparison Study on Urban Morphology of Beijing and Shanghai
    ( 2013)
    Wang, Zhu
    With time going by, urban morphological structures of Beijing and Shanghai have dramatic changes during last decades. These changes often ignored by citizen, but have big influence for human daily life. And the changes of urban morphologies should be easily recognized by citizen. There are many previous comparative studies between these two Chinese cities, and these studies focus on types of areas, such as environment, traffic, city planning and cultures etc.. There are also many comparative studies about using space syntax theory and geometrical statistics to study urban morphologies. However, there are not direct comparison urban morphological study between Beijing and Shanghai, which from multiple perspectives. In order to gain a better understanding of urban morphologies, this thesis take street networks of two Chinese cites as a research object, based on space syntax theory, as well the combination of traditional geometrical statistics, comparative analysis methods to systematic quantitative analyze and comparative study the different street networks of urban space in Beijing and Shanghai. This project work analyzes hierarchy of axial lines, which automatically generated from street networks, to do a morphological comparison from topological perspective. And it analyzes frequency distribution of axial lines’ included angles and length of axial lines to study urban morphologies from geometrical perspective. Results in the project seem to empirical study that, the well-connected streets are minority part, which all most distributed in the sample cities’ ring structures and center areas. Street networks constitute an obvious regular grid pattern of Beijing and a curves pattern of Shanghai. Based on the hierarchical levels of street networks, research samples have same hierarchical levels but without the same number of street lines. The included angles of axial lines have an exceptionally sharply peaked bimodal distribution for both cities and number of most connected street’s length do not increase so much from ring1 to ring6 for Beijing, but they have much change for Shanghai.
  • Publication
    A Case Study on the Extraction of the Natural Cities from Nightlight Image of the United States of America
    ( 2013)
    LIU, QINGLING
    The boundaries of the cities are not immutable, they can be changed. With the development of the economies and societies, the population and pollution of cities are increasing. Some urban areas are expanding with more population or other dynamics of urbanization, while other urban areas are reducing with the changing of the dynamics. Therefore, detecting urban areas or delineating the boundaries of the cities is one of the most important steps for urban studies, which is closely related to human settlements and human activities. Remote sensing data (RS) is widely used to monitor and detect land use and land cover on the surface of the earth. But the extraction of urban areas from the ordinary RS data is not easy work. The Operational Linescan System (OLS) is the sensors of the Defense Meteorological Satellite Program (DMSP). The nighttime lights from the DMSP/OLS provide worldwide remotely sensed data to analyze long-term light emissions which are closely related to human activities. But the nighttime lights imagery data contains inherent errors. Therefore, the approaches to calibrate the data and extract the urban areas from the data are complicated. The long-term objective of this thesis is to delineate the boundaries of the natural cities of the continental United States of America (USA) from 1992 to 2010 of nightlight imagery data with all the different satellites. In this thesis, the coefficients for the intercalibration of the nightlight imagery data have been calculated based on the method developed by Elvidge, et al. (2009), but the coefficients are new and available. The approach used to determine the most appropriate threshold value is very important to eliminate the possible data error. The method to offset this possible error and delineate the boundaries of the cities from nightlight imagery data is the head/tail breaks classification, which is proposed by Jiang (2012b). The head/tail breaks classification is also useful for finding the ht-index of the extracted natural cities which is developed by Jiang and Yin (2013). The ht-index is an indicator of the underlying hierarchy of the data. The results of this study can be divided into two categories. In the first, the achieved coefficients for the intercalibration of nightlight images of the continental USA are shown in a table, and the achieved data of the urban areas are stored in a data archive. In the second, the different threshold values of the uncalibrated images and the individual threshold value of the calibrated images are shown in tables, and the results of the head/tail breaks classification and power law test are also drawn. The results show that the acquired natural cities obey the power law distribution. And the results also confirm that the head/tail breaks classification is available for finding a suitable threshold value for the nightlight imagery data. Key words: cities’ boundaries; DMSP/OLS; head/tail breaks classification; nighttime lights; power law; urban areas
  • Publication
    Corporate Social Responsibility in Botswana : a management perspective / Mooketsi Moiketso
    ( 2013)
    Moiketso, Mooketsi
    "This study focuses on corporate social responsibility from a management perspective. The study had the following objectives - to investigate the level of adoption of CSR by companies in Botswana; to find out why companies in Botswana have embraced CSR; to investigate the views of governments, pressure groups and stakeholders on companies which have embraced CSR in their communities; and to recommend to company management and stakeholders on how best they can use CSR to their best advantage. A Positivist (quantitative) strategy was used to execute this study and data capture was done through the use of a structured questionnaire. This instrument was issued to 100 members of management from companies based near Mahalapye and Gaborone. The response rate was 88%. The key findings were that many companies have CSR policies at their workplaces but they are not yet fully functional. Many companies have also embraced CSR for political mileage reasons only and to appear to be environmentally conscious. / Thesis (MBA) North-West University, Mafikeng Campus, 2013"
  • Publication
    A Comparison Study on a Set of Space Syntax based Methods : Applying metric, topological and angular analysis to natural streets, axial lines and axial segments
    ( 2013)
    Xia, Xiaolin
    Recently, there has been an increasing interest in looking at urban environment as a complex system. More and more researchers are paying attention to the study of the configuration of urban space as well as human social activities within it. It has been found that correlation exists between the morphological properties of urban street network and observed human social movement patterns. This correlation implies that the influence of urban configurations on human social movements is no longer only revealed from the sense of metric distance, but also revealed from topological and geometrical perspectives. Metric distances, topological relationships and angular changes between streets should be considered when applying space syntax analysis to an urban street network. This thesis is mainly focused on the comparison among metric, topological and angular analyses based on three kinds of urban street representation models: natural streets, axial lines and axial segments. Four study areas (London, Paris, Manhattan and San Francisco) were picked up for empirical study. In the study, space syntax measures were calculated for different combinations of analytical methods and street models. These theoretical space syntax accessibility measures (connectivity, integration and choice) were correlated to the corresponding practical human movement to evaluate the correlations. Then the correlation results were compared in terms of analytical methods and street representation models respectively. In the end, the comparison of results show that (1) natural-street based model is the optimal street model for carrying out space syntax analysis followed by axial lines and axial segments; (2) angular analysis and topological analysis are more advanced than metric analysis; and (3) connectivity, integration and local integration (two-step) are more suitable for predicting human movements in space syntax. Furthermore, it can be hypothesized that topological analysis method with natural-street based model is the best combination for the prediction of human movements in space syntax, for the integration of topological and geometrical thinking.
  • Publication
    Gender and cerebral lateralization of audio-visual perception of emotion
    ( 2014)
    Halvorsen, Gunn Kristin
    Presentation of brief (120ms, 160ms, 520ms) audio prosody-, video- and audio-visual clips containing congruent emotion (anger, fear, happiness, neutral, sadness/ positive- and negative valence) was used in a divided visual field technique/dichotic listening behavioral experiment consisting of 17 males and 17 females to investigate a possible gender difference in cerebral lateralization in perception of emotion. Clips were created from Montréal affective voices and the Montréal Pain and Affective Face Clips. Accuracy percentages of correct recognition of emotion were recorded. Findings showed no support for either the right-hemisphere- or the valence hypothesis. Gender as a between subject factor was non significant. Clips containing both audio and video had the highest accuracy score of all modalities. Audio-only prosody had significant lower accuracy score compared to video-only and audio-visual clips. Positive valence in the short length may have an early accuracy advantaged compared to negative valence in the audio-visual modality that dissipates in 120ms-160ms range, with the accuracy difference disappearing between the categories. The same advantage can be found in anger, while happiness, fear and neutral have no significant differences in accuracy in lengths in the audio-visual modality.
  • Publication
    Pests and pest controlling organisms across tropical agroecological landscapes in relation to forest and tree-cover
    ( 2014)
    " Lemessa, Debissa"
    A major challenge in agroecosystems is how to manage the systems so that it reduces crop pests and enhances natural pest control. This thesis investigates patterns of crop pests and top-down effects of birds and arthropod predators in relation to land-use composition across spatial scales. In paper (I) I examined the crop distribution and land-use types in relation to the crop raiding patterns in 15 transectsin sites close to and far from forests along with a questionnaire survey at household level. I found severe crop raiding close to forests, but it had no impact on crop composition growing between the two sites. In paper (II) I examined the effect of forest and tree cover, at local and landscape scales, on the abundance of arthropod predators by collecting specimens from 40 home gardens. My result showed higher abundance of arthropod predators when either the home garden or the surroundings had a high tree-cover, compared to when tree-cover at both scales was similarly either high or low. In paper (III) I investigated the effect of excluding birds and arthropod predators on leaf damage on rape seed in 26 home gardens. I found stronger top-down impacts from arthropod predators on crop pests in tree-poor gardens than in tree-rich gardens. There was no effect of birds. In paper (IV) I explored the effect of landscape complexity on bird and arthropod predation using plasticine caterpillars in 36 home gardens across landscapes. The rate of arthropod predation on caterpillars was higher in simple than in complex landscapes. The rate of bird predation did not vary between complex and simple landscapes. In simple landscapes, arthropod predation was higher than that of birds. The overall results suggest that simplified gardens/landscapes still have enough habitat heterogeneity to support arthropod predators for the significant top-down controlling effect on crop pests. However, I did not find clear effect of complexityon the top-down effect of birds. /

    At the time of the doctoral defence the following papers were unpublished and had a status as follows: Paper 1: Manuscript; Paper 3: Manuscript; Paper 4: Manuscript
  • Publication
    Can the CCCTB Alleviate Tax Discrimination Against Loss-making European Multinational Groups?
    ( 2014)
    " Ortmann, Regina, Sureth, Caren"
    In March 2011, the European Commission submitted a proposal for a Council Directive on an optional common consolidated corporate tax base (CCCTB). If this proposed CCCTB system comes into force, taxes calculated under the currently existing system of separate accounting might be replaced by a system of group consolidation and formulary apportionment. Then, multinational groups (MNGs) would face the decision as to whether to opt for the CCCTB system. Prior research focuses mainly on the differences in economic behaviour under both systems in general. By con-trast, we study the conditions under which one or the other tax system is preferable from the per-spective of an MNG, with a particular focus on loss-offsets. We identify four effects that determine the decision of an MNG: the tax-utilization of losses, the allocation of the tax base, the dividend and intragroup interest taxation. We find mixed results, e.g., that the CCCTB system proves ad-vantageous for increasing loss/profit streams (e.g. from start-ups or R&D projects) of the individual group entities, whereas the system of separate accounting is beneficial for decreasing profit/loss streams (e.g. caused by a decrease in return from a mature product). The results of our analysis are helpful for MNGs facing the decision as to whether to opt for the CCCTB system and can also support legislators and politicians in the EU but also in other regions in their tax reform discussions. (authors' abstract) / Series: WU International Taxation Research Paper Series
  • Publication
    Collaborative development: exploring residential design alternatives in Novato, California
    ( 2014)
    Bangerter, Adam Glenn
    "Master of Landscape Architecture / Department of Landscape Architecture/Regional and Community Planning / Howard Hahn / In Novato, California, zoning regulations and the city’s urban growth boundary (UGB) have restricted development on open agricultural and hillside land outside the city. These restrictions have added to a shortage of affordable homes in Novato in spite of a demand for housing. Population growth estimates suggest that this demand will continue and strategic development of land outside the current city boundaries will need to occur in order over the next 15-20 years (Bay Area Census Data 2010 and Heid 2004). This report outlines a process of land development which evaluates the success of a development alternative relative to what the land owners, developers and the community want, need, and value. This process involved producing four community design alternatives of varying housing densities for an 867 acre parcel of land just beyond Novato’s UGB. The alternatives were: high density (556 homes), medium density (224 homes), low density (14 homes), and low density + land swap (72 homes). Using a systematic scoring process, each alternative was evaluated based on what the land owner, developer, and the community valued in the development and then awarded each a feasibility score. This score represents likelihood of implementation. The higher the feasibility score, the more likely the alternative could be pursued as a development option. The high density alternative (556 homes) received the lowest feasibility score. It met many of the land owner and developer values, but few of the community values. The low density + land swap alternative (58 homes) received the highest feasibility score. This alternative met nearly all of the developer and owner values as well as the community values. The land swap option of this alternative was unique and made this design more feasible. The swap identified land areas on the site property that could be traded for developable land inside the city boundary allowing Novato to maintain the rural character of the city fringe, while giving the developer land that could be used for future development. This alternative is a compromise that adequately addresses the values of all involved and is therefore recommended as the most feasible design possibility."
  • Publication
    Before its time? : a case study and lessons of the Yasuní-ITT initiative
    ( 2014)
    Dyar, Joel
    Masters in Science / Department of Landscape Architecture/Regional & Community Planning / Stephanie A. Rolley / This case study considers the lessons of Ecuador’s Yasuní-ITT initiative for future climate change policy and international conservation and development efforts. A comprehensive post-cancellation history of the initiative and background information regarding key domestic and international actors and institutions is presented in the Literature Review. Documents identified from LexisNexis and Google searches are analyzed to identify seven narratives of the initiative’s failure, which provide a basis for the suggestion of lessons. Questions regarding supply-side climate policy opportunities and challenges are explored. The initiative’s political mismanagement, design omissions and insufficient domestic political efforts, and a lack of contribution incentives are identified as the key causes of failure. The author concludes that the initiative’s supply-side model of shared sacrifices has the potential to align developed and developing country needs in support of greenhouse gas emissions reduction goals while addressing the difficulties posed by an emergent political economy of developing world resource extractivism in Ecuador and elsewhere. Future research regarding supply-side climate policies is suggested.
  • Publication
    Fluctuation solution theory
    ( 2014)
    Ploetz, Elizabeth Anne
    "Doctor of Philosophy / Department of Chemistry / Paul E. Smith / The Kirkwood-Buff (KB) theory of solutions, published in 1951, established a route from integrals over radial (pair) distribution functions (RDFs) in the grand canonical ensemble to a set of thermodynamic quantities in an equivalent closed ensemble. These “KB integrals” (KBIs) can also be expressed in terms of the particle-particle (i.e., concentration or density) fluctuations within grand canonical ensemble regions. Contributions by Ben-Naim in 1977 provided the means to obtain the KBIs if one already knew the set of thermodynamic quantities for the mixture of interest; that is, he provided the inversion procedure. Thus, KB theory provides a two-way bridge between local (microscopic) and global (bulk/thermodynamic) properties. Due to its lack of approximations, its wide ranging applicability, and the absence of a competitive theory for rigorously understanding liquid mixtures, it has been used to understand solution microheterogeneity, solute solubility, cosolvent effects on biomolecules, preferential solvation, etc. Here, after using KB theory to test the accuracy of pair potentials, we present and illustrate two extensions of the theory, resulting in a general Fluctuation Solution Theory (FST). First, we generalize KB theory to include two-way relationships between the grand canonical ensemble’s particle-energy and energy-energy fluctuations and additional thermodynamic quantities. This extension allows for non-isothermal conditions to be considered, unlike traditional KB theory. We illustrate these new relationships using analyses of experimental data and molecular dynamics (MD) simulations for pure liquids and binary mixtures. Furthermore, we use it to obtain conformation-specific infinitely dilute partial molar volumes and compressibilities for proteins (other properties will follow) from MD simulations and compare the method to a non-FST method for obtaining the same properties. The second extension of KB theory involves moving beyond doublet particle fluctuations to additionally consider triplet and quadruplet particle fluctuations, which are related to derivatives of the thermodynamic properties involved in regular KB theory. We present these higher order fluctuations obtained from experiment and simulation for pure liquids and binary mixtures. Using the newfound experimental third and fourth cumulants of the distribution of particles in solution, which can be extracted from bulk thermodynamic data using this extension, we also probe particle distributions’ non-Gaussian nature."
  • Publication
    Memories of combat: how World War II veterans construct their memory over time
    ( 2014)
    Prosser, Michelle
    "Master of Arts / Department of History / Mark P. Parillo / Throughout the 1990s and into the twenty-first century, American society sought to record the stories of World War II veterans before they passed on. The United States Congress established the Veterans History Project in 2000 in order to collect stories not only from World War II veterans, but also from veterans of all wars. Although many similar programs existed before this one, this initiative stimulated the interest of communities all over the country to conduct oral history projects of their own. As a result, the availability of veterans’ accounts improved for scholars as well as for the general public. Along with veterans’ interviews, many collections include donated letters, diaries, and memoirs. Many of these institutions have posted their materials on the internet, thus giving easier public access to the sources. The increased availability of veterans’ accounts has shifted the question from, “What was the World War II veterans’ experience?” to “How do the veterans reflect on their experience?” This study analyzes the memories of World War II veterans who have documented their experiences at two separate times in their lives. It examines wartime letters and diaries written by soldiers as well as, oral histories conducted after the war. This study compares three veterans’ memories over time and the influence of collective memory on their remembrances. This case study finds that although these three veterans had very different experiences, they all reflected on their experience in similar ways. The veterans’ immediate accounts were straightforward and without introspection, while their later accounts included interpretation and analysis of their experiences. Although the details in each narrative are unique to the veteran, the overall tone and meaning of the memory constructed in their oral histories followed the meaning presented in the American collective memory of the war."
  • Publication
    Origins and Adaptation in Humans : A Case Study of Taste and Lifestyle
    ( 2015)
    Sjöstrand, Agnès E.
    In this thesis, I use population genetics and statistical approaches to investigate early human demography, infer local adaptation in diverse sets of populations, and study the genetic basis for taste perception. In the first paper, I examine the genomic evidence for a severe bottleneck, which has been suggested based on paleontological and climate studies to coincide with the emergence of anatomically modern humans. Using a Bayesian approach, I evaluate the genetic evidence of a bottleneck between 190,000 and 130,000 years ago and find that the data is in favor of a model without bottleneck at this time point. I further develop a method to detect local adaptation based on frequencies of private haplotypes. I first show, using simulated data, that this method can detect local adaption. Applied to large-scale human genotype data, this method detects known signals of positive selection in human data such as the positive selection around the lactase gene in Europeans and East Africans. Also, this method permits to improve knowledge on potential adaptation events in humans as it finds several regions potentially selected that were not previously described. I further investigate patterns of adaptation in whole genome data based on a diverse set of African populations. The results from the regions potentially selected show that diet and pathogens are the common driving forces of adaptation in all studied populations. There is evidence that taste perception have evolved in concert with diet, environment, and the organismal needs in humans. For this reason, I study taste perception in populations differing on lifestyle (hunter-gatherers, farmers and nomad herders). I present taste perception phenotypes for all tastes (sweet, bitter, sour, salty and umami) and relate them to high density genotype data. I show that taste and taste-involved genes have evolved with lifestyle. By performing an association study, I also show that variation in taste perception involves more genes than only the taste receptors genes. In this thesis, by analyzing human genetic data with a population genetics approaches, I covered several topics of human ancient demography and adaptation and show the utility of using large-scale genetic data to better understand human history.
  • Publication
    Oats and Honesty : Organisational Transparency Measured Through Audience Perceptions
    ( 2015)
    Högström, Julia, Stenbom, Agnes
    Our modern society posts high demands for transparency, not least regarding organisational communication. The perception that the power of defining transparency lies with the audience aimed to perceive it has reached great academic anchoring, but research on the field is thin. The Swedish lifestyle company Oatly describes itself as transparent, but with a number of hypotheses the authors of this thesis essay examine whether their audience agrees. The study also investigates which key factors are contributing to the audience’s perception of the company’s communication. The study is both theoretically and empirically based on a model created by Rawlins (2009), in which four main categories determine an organisation’s transparency; Participation, Substantial Information, Accountability and Secretive. The empirical studies (an internet survey with 346 respondents and 4 conversational interviews) offered evidence which manifests trends among the audience. Oatly’s clear and accessible communication, trustworthiness and humor turned out to be key factors contributing to the audience perceiving Oatly as very transparent. The perception of Oatly’s transparency seemed to be created when the audience interacted with the company, their friends or product packagings, rather than when they were given information through a one-way channel. This thesis essay consequently concludes with an appeal for further research on the notion of transparency to - in order to achieve validity - be put in a modern context where mobility and social interaction are central concepts. / Vårt moderna samhälle ställer höga krav på transparens, inte minst när det gäller organisationskommunikation. Uppfattningen om att makten att definiera transparens ligger hos den publik tänkt att åtnjuta den har nått stark akademisk förankring, men forskningsfältet är tunnt. Det svenska livsstilsföretaget Oatly beskriver ​sig själva som transparenta, men med en rad hypoteser undersöker författarna av denna uppsats istället huruvida företagets ​publik uppfattar det som sådant , samt vilka faktorer som påverkar deras uppfattning. Studien finner både sin teoretiska och empiriska utgångspunkt i en av Rawlins (2009) sammanställd modell där fyra huvudsakliga faktorer avgör organisationers transparens: Deltagande, konkret information, pålitlighet och hemligheter. Studiens empiri (en internetenkät med 346 respondenter samt 4 djupintervjuer) erbjöd bevis som manifesterar uppenbara trender bland publiken. Oatly’s tydliga och lätttillgängliga kommunikation, produktförpackningar och humor visade sig vara centrala faktorer, och författarna når i uppsatsen slutsatsen att Oatly definieras som mycket transparenta av sin publik. Uppfattningen av Oatly’s transparens tycktes uppstå vid de tillfällen då publiken interagerade med företaget, sina vänner eller produktförpackningar, snarare än när de enbart levererades information. Uppsatsen avslutas därför med en notering om att forskning på ämnet transparens måste - för att uppnå validitet - sättas in i ett samtida kontext där mobilitet och social interaktion är centrala koncept.
  • Publication
    LEARNING IN COMMUNITY: USING BLOGGING TO FACILITATE AND CULTIVATE A COMMUNITY OF PRACTICE OF PROFESSIONAL LEARNERS
    ( 2015)
    Morrison, Dirk
    Kolb (1984) identifies learning as a process whereby knowledge is created through transformation of experience. Wenger (1998) would further suggest that education is a mutual development process between communities and its learners, well beyond mere socializing. The value of learning “in community”, then, affords educators an opportunity to create the just right conditions for themselves as both teacher and learner. The success of learning communities depends on reciprocal engagement of its members to share knowledge, experiences, and skills with colleagues (Kling & Courtright, 2003). This study examined the case for blogging as a means to facilitate a self-directed community of professional learners, educators who endeavour to further develop their knowledge, understanding, and expertise of teaching and learning via the cultivation of an authentic informal online learning community. Using social learning theory as the analytical framework, this study looked at ways participation in informal, self-directed online learning communities not only encourages, but discloses potential barriers in participants’ abilities to (1) develop their understanding of teaching and learning as a self-directed, informal online community of engaged professionals; (2) expand their understanding of blogging as a tool to engage and participate in informal, online self-directed professional learning; and (3) deepen their understanding of working within the context of community: self-directed professionals engaging informally online to support, enhance, and reflect critically as engaged learners, specifically through the blogging process. This study investigated various motivations and actions that might bring participants together as engaged, self-directed professional learners and better explain how and why these informal online communities might experience success. Ultimately, it was the researcher’s hope this study would identify specific elements within the participants’ learning, offering both insight and relevance for educators as an engaged, informal, self-directed online community of professional learners.
  • Publication
    Regulatory networks of Neisseria meningitidis and their implications for pathogenesis
    ( 2015)
    Golfieri, Giacomo
    "Neisseria meningitidis, the leading cause of bacterial meningitis, can adapt to different host niches during human infection. Both transcriptional and post-transcriptional regulatory networks have been identified as playing a crucial role for bacterial stress responses and virulence. We investigated the N. meningitidis transcriptional landscape both by microarray and by RNA sequencing (RNAseq). Microarray analysis of N. meningitidis grown in the presence or absence of glucose allowed us to identify genes regulated by carbon source availability. In particular, we identified a glucose-responsive hexR-like transcriptional regulator in N. meningitidis. Deletion analysis showed that the hexR gene is accountable for a subset of the glucose-responsive regulation, and in vitro assays with the purified protein showed that HexR binds to the promoters of the central metabolic operons of meningococcus, by targeting a DNA region overlapping putative regulatory sequences. Our results indicate that HexR coordinates the central metabolism of meningococcus in response to the availability of glucose, and N. meningitidis strains lacking the hexR gene are also deficient in establishing successful bacteremia in a mouse model of infection. In parallel, RNAseq analysis of N. meningitidis cultured under standard or iron-limiting in vitro growth conditions allowed us to identify novel small non-coding RNAs (sRNAs) potentially involved in N. meningitidis regulatory networks. Manual curation of the RNAseq data generated a list of 51 sRNAs, 8 of which were validated by Northern blotting. Deletion of selected sRNAs caused attenuation of N. meningitidis infection in a murine model, leading to the identification of the first sRNAs influencing meningococcal bacteraemia. Furthermore, we describe the identification and initial characterization of a novel sRNA unique to meningococcus, closely associated to genes relevant for the intracellular survival of pathogenic Neisseriae. Taken together, our findings could help unravel the regulation of N. meningitidis adaptation to the host environment and its implications for pathogenesis"
  • Publication
    Demersal communities in the Mediterranean Sea: a case study of Triglidae (Osteichthyes, Scorpaeniformes) on the conservation and sustainable use of marine resources
    ( 2015)
    Montanini, Stefano
    An appropriate management of fisheries resources can only be achieved with the continuous supply of information on the structure and biology of populations, in order to predict the temporal fluctuations. This study supports the importance of investigating the bio-ecology of increasingly exploited and poorly known species, such as gurnards (Osteichthyes, Triglidae) from Adriatic Sea (Mediterranean), to quantify their ecological role into marine community. It also focuses on investigate inter and intra-specific structuring factor of Adriatic population. These objectives were achieved by: 1) investigating aspects of the population dynamics; 2) studying the feeding biology through the examination of stomach contents; 3) using sagittal otoliths as potential marker of species life cycle; 4) getting preliminary data on mDNA phylogeny. Gurnards showed a specie-specific “critical size” coinciding with the start of sexual maturity, the tendency to migrate to greater depths, a change of diet from crustaceans to fish and an increase of variety of food items eaten. Distribution of prey items, predator size range and depth distribution were the main dimensions that influence the breadth of trophic niche and the relative difference amongst Adriatic gurnards. Several feeding preferences were individuated and a possible impact among bigger-size gurnards and other commercial fishes (anchovy, gadoids) and Crustacea (such as mantis prawn and shrimps) were to be necessary considered. Otolith studies showed that gurnard species have a very fast growth despite other results in other areas; intra-specific differences and the increase in the variability of otolith shape, sulcus acusticus shape, S:O ratios, sulcus acusticus external crystals arrangement were shown between juveniles and adults and were linked to growth (individual genetic factors) and to environmental conditions (e.g. depth and trophic niche distribution). In order to facilitate correct biological interpretation of data, molecular data were obtained for comparing morphological distance to genetic ones.
  • Publication
    Bioremediation of PCB-contaminated marine sediments: From identification of indigenous dehalorespirers to enhancement of microbial reductive dechlorination
    ( 2015)
    Nuzzo, Andrea
    Marine sediments are the main accumulation reservoir of organic recalcitrant pollutants such as polychlorinated biphenyls (PCBs). In the anoxic conditions typical of these sediments, anaerobic bacteria of the phylum Chloroflexi are able to attack these compounds in a process called microbial reductive dechlorination. Such activity and members of this phylum were detected in PCB-impacted sediments of the Venice Lagoon. The aim of this work was to investigate microbial reductive dechlorination and design bioremediation approaches for marine sediments of the area. Three out of six sediment cultures from different sampling areas exhibited dechlorination activities in the same conditions of the site and two phylotypes (VLD-1 and VLD-2) were detected and correlated to this metabolism. Biostimulation was tested on enriched dechlorinating sediment cultures from the same site using five different electron donors, of which lactate was the best biostimulating agent; complementation of microbial and chemical dechlorination catalyzed by biogenic zerovalent Pd nanoparticles was not effective due to sulfide poisoning of the catalyst. A new biosurfactant-producing strain of Shewanella frigidimarina was concomitantly obtained from hydrocarbon-degrading marine cultures and selected because of the low toxicity of its product. All these findings were then exploited to develop bioremediation lab-scale tests in shaken reactors and static microcosms on real sediments and water of the Venice lagoon, testing i) a bioaugmentation approach, with a selected enriched sediment culture from the same area, ii) a biostimulation approach with lactate as electron donor, iii) a bioavailability enhancement with the supplementation of the newly-discovered biosurfactant, and iv) all possible combinations of the afore-mentioned approaches. The best bioremediation approach resulted to be a combination of bioaugmentation and bioremediation and it could be a starting point to design bioremediation process for actual marine sediments of the Venice Lagoon area.
  • Publication
    Essays on Ethnic Diversity and Development
    ( 2015)
    Chiovelli, Giorgio
    This dissertation consists of three papers. The first paper "Ethnicity, Migration and Conflict: Evidence from Contemporary South Africa” exploits some of the institutional changes intervened in South Africa during the end of apartheid to investigate the relationship between ethnic diversity and conflict. I find within-ethnic polarization to be significantly related to the intensity of armed confrontations among black-dominated groups. My investigation thus gives strong and robust empirical support to the theoretical arguments which identify ethnic diversity as one of the determinants of civil conflict. The second chapter, "Pre-Colonial Centralization, Colonial Activities and Development in Latin America", investigates the hypothesis that pre-colonial ethnic institutions shaped contemporary regional development in Latin America. I document a strong and positive relationship between pre-colonial centralization and regional development. Results are in line with the view that highly centralized pre-colonial societies acted as a persistent force of agglomeration of economic activities and a strong predictor of colonial state capacity. The results provide a first evidence of the existence of a link between pre-colonial centralization, colonial institutional arrangements and contemporary economic development. The third paper "Bite and Divide: Malaria and Ethnic Diversity” investigates the role of malaria as a fundamental determinant of modern ethnic diversity. This paper explores the hypothesis, that a large exposure to malaria has fostered differential interactions that reduced contacts between groups and increased interactions within them Results document that malaria increases the number of ethnic groups at all levels of spatial disaggregation and time periods (exploiting historical and current ethnic diversity). Regressions' results show that endogamous marriages are more frequent in areas with higher geographic suitability to malaria. The results are in line with the view that malaria increases intra-ethnic interactions while decreasing inter-ethnic ones.