Project acronym Allelic Regulation
Project Revealing Allele-level Regulation and Dynamics using Single-cell Gene Expression Analyses
Researcher (PI) Thore Rickard Hakan Sandberg
Host Institution (HI) KAROLINSKA INSTITUTET
Country Sweden
Call Details Consolidator Grant (CoG), LS2, ERC-2014-CoG
Summary As diploid organisms inherit one gene copy from each parent, a gene can be expressed from both alleles (biallelic) or from only one allele (monoallelic). Although transcription from both alleles is detected for most genes in cell population experiments, little is known about allele-specific expression in single cells and its phenotypic consequences. To answer fundamental questions about allelic transcription heterogeneity in single cells, this research program will focus on single-cell transcriptome analyses with allelic-origin resolution. To this end, we will investigate both clonally stable and dynamic random monoallelic expression across a large number of cell types, including cells from embryonic and adult stages. This research program will be accomplished with the novel single-cell RNA-seq method developed within my lab to obtain quantitative, genome-wide gene expression measurement. To distinguish between mitotically stable and dynamic patterns of allelic expression, we will analyze large numbers a clonally related cells per cell type, from both primary cultures (in vitro) and using transgenic models to obtain clonally related cells in vivo.
The biological significance of the research program is first an understanding of allelic transcription, including the nature and extent of random monoallelic expression across in vivo tissues and cell types. These novel insights into allelic transcription will be important for an improved understanding of how variable phenotypes (e.g. incomplete penetrance and variable expressivity) can arise in genetically identical individuals. Additionally, the single-cell transcriptome analyses of clonally related cells in vivo will provide unique insights into the clonality of gene expression per se.
Summary
As diploid organisms inherit one gene copy from each parent, a gene can be expressed from both alleles (biallelic) or from only one allele (monoallelic). Although transcription from both alleles is detected for most genes in cell population experiments, little is known about allele-specific expression in single cells and its phenotypic consequences. To answer fundamental questions about allelic transcription heterogeneity in single cells, this research program will focus on single-cell transcriptome analyses with allelic-origin resolution. To this end, we will investigate both clonally stable and dynamic random monoallelic expression across a large number of cell types, including cells from embryonic and adult stages. This research program will be accomplished with the novel single-cell RNA-seq method developed within my lab to obtain quantitative, genome-wide gene expression measurement. To distinguish between mitotically stable and dynamic patterns of allelic expression, we will analyze large numbers a clonally related cells per cell type, from both primary cultures (in vitro) and using transgenic models to obtain clonally related cells in vivo.
The biological significance of the research program is first an understanding of allelic transcription, including the nature and extent of random monoallelic expression across in vivo tissues and cell types. These novel insights into allelic transcription will be important for an improved understanding of how variable phenotypes (e.g. incomplete penetrance and variable expressivity) can arise in genetically identical individuals. Additionally, the single-cell transcriptome analyses of clonally related cells in vivo will provide unique insights into the clonality of gene expression per se.
Max ERC Funding
1 923 060 €
Duration
Start date: 2015-07-01, End date: 2020-12-31
Project acronym CONPOL
Project Contexts, networks and participation: The social logic of political engagement
Researcher (PI) Sven Aron Oskarsson
Host Institution (HI) UPPSALA UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), SH2, ERC-2015-CoG
Summary The statement that individuals’ immediate social circumstances influence how they think and act in the political sphere is a truism. However, both theoretical and empirical considerations have often prevented political scientists from incorporating this logic into analyses of political behavior. In the CONPOL project we argue that it is necessary to return to the idea that politics follows a social logic in order to push the theoretical and empirical boundaries in explaining political behavior. That is, people do not act as isolated individuals when confronting complex political tasks such as deciding whether to vote and which party or candidate to vote for. Instead politics should be seen as a social experience in which individuals arrive at their decisions within particular social settings: the family, the peer group, the workplace, the neighborhood. In what way do parents and other family members influence an individual’s political choices? What is the role of workmates and neighbors when individuals arrive at political decisions? Do friends and friends’ friends affect how you think and act in the political sphere? To answer such questions the standard approach to gather empirical evidence on political behavior based on national sample surveys needs to be complemented by the use of population wide register data. The empirical core of the CONPOL project is unique Swedish register data. Via the population registers provided by Statistics Sweden it is possible to identify several relevant social settings such as parent-child relations and the location of individuals within workplaces and neighborhoods. The registers also allow us to identify certain network links between individuals. Furthermore, Statistics Sweden holds information on several variables measuring important political traits. A major aim for CONPOL is to complement this information by scanning in and digitalizing election rolls with individual-level information on turnout across several elections.
Summary
The statement that individuals’ immediate social circumstances influence how they think and act in the political sphere is a truism. However, both theoretical and empirical considerations have often prevented political scientists from incorporating this logic into analyses of political behavior. In the CONPOL project we argue that it is necessary to return to the idea that politics follows a social logic in order to push the theoretical and empirical boundaries in explaining political behavior. That is, people do not act as isolated individuals when confronting complex political tasks such as deciding whether to vote and which party or candidate to vote for. Instead politics should be seen as a social experience in which individuals arrive at their decisions within particular social settings: the family, the peer group, the workplace, the neighborhood. In what way do parents and other family members influence an individual’s political choices? What is the role of workmates and neighbors when individuals arrive at political decisions? Do friends and friends’ friends affect how you think and act in the political sphere? To answer such questions the standard approach to gather empirical evidence on political behavior based on national sample surveys needs to be complemented by the use of population wide register data. The empirical core of the CONPOL project is unique Swedish register data. Via the population registers provided by Statistics Sweden it is possible to identify several relevant social settings such as parent-child relations and the location of individuals within workplaces and neighborhoods. The registers also allow us to identify certain network links between individuals. Furthermore, Statistics Sweden holds information on several variables measuring important political traits. A major aim for CONPOL is to complement this information by scanning in and digitalizing election rolls with individual-level information on turnout across several elections.
Max ERC Funding
1 621 940 €
Duration
Start date: 2016-09-01, End date: 2021-08-31
Project acronym DELMIT
Project Maintaining the Human Mitochondrial Genome
Researcher (PI) Maria Falkenberg Gustafsson
Host Institution (HI) GOETEBORGS UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), LS1, ERC-2015-CoG
Summary Mitochondria are required to convert food into usable energy forms and every cell contains thousands of them. Unlike most other cellular compartments, mitochondria have their own genomes (mtDNA) that encode for 13 of the about 90 proteins present in the respiratory chain. All proteins necessary for mtDNA replication, as well as transcription and translation of mtDNA-encoded genes, are encoded in the nucleus. Mutations in nuclear-encoded proteins required for mtDNA maintenance is an important cause of neurodegeneration and muscle diseases. The common result of these defects is either mtDNA depletion or accumulation of multiple deletions of mtDNA in postmitotic tissues.
The long-term goal (or vision) of research in my laboratory is to understand in molecular detail how mtDNA is replicated and how this process is regulated in mammalian cells. To this end we use a protein biochemistry approach, which we combine with in vivo verification in cell lines. My group was in 2004 the first to reconstitute mtDNA replication in vitro and we have continued to develop even more elaborate system ever since. In the current application, the major focus is studies of the mitochondrial D-loop region, a triple-stranded structure in the mitochondrial genome. The D-loop functions as a regulatory hub and we will determine how initiation and termination of mtDNA replication is controlled from this region. We will also determine the physical organization of the mtDNA replication machinery at the replication fork and establish how mtDNA deletions, a classical hallmark of human ageing, are formed.
Summary
Mitochondria are required to convert food into usable energy forms and every cell contains thousands of them. Unlike most other cellular compartments, mitochondria have their own genomes (mtDNA) that encode for 13 of the about 90 proteins present in the respiratory chain. All proteins necessary for mtDNA replication, as well as transcription and translation of mtDNA-encoded genes, are encoded in the nucleus. Mutations in nuclear-encoded proteins required for mtDNA maintenance is an important cause of neurodegeneration and muscle diseases. The common result of these defects is either mtDNA depletion or accumulation of multiple deletions of mtDNA in postmitotic tissues.
The long-term goal (or vision) of research in my laboratory is to understand in molecular detail how mtDNA is replicated and how this process is regulated in mammalian cells. To this end we use a protein biochemistry approach, which we combine with in vivo verification in cell lines. My group was in 2004 the first to reconstitute mtDNA replication in vitro and we have continued to develop even more elaborate system ever since. In the current application, the major focus is studies of the mitochondrial D-loop region, a triple-stranded structure in the mitochondrial genome. The D-loop functions as a regulatory hub and we will determine how initiation and termination of mtDNA replication is controlled from this region. We will also determine the physical organization of the mtDNA replication machinery at the replication fork and establish how mtDNA deletions, a classical hallmark of human ageing, are formed.
Max ERC Funding
1 999 985 €
Duration
Start date: 2016-11-01, End date: 2021-10-31
Project acronym DISLIFE
Project Liveable disabilities: Life courses and opportunity structures across time
Researcher (PI) Lotta Marie Christine Vikstroem
Host Institution (HI) UMEA UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), SH2, ERC-2014-CoG
Summary In Europe today disabled people comprise some 65 million (10%). Yet they are marginalized in society and research, and little is known on how disabilities become liveable. This project challenges this bias by proposing to investigate ‘liveable disabilities’ as a function of disability and opportunity structures across time. It analyses four life course dimensions: disabled people’s (1) health and well-being; (2) involvement in education and work; (3) in a partner relationship and family; and (4) in leisure structures. Through this I identify liveable disabilities before, during and after the Swedish welfare state. The results are of significant cross-national interest as they form a useful baseline for what constitutes liveable disabilities, which helps governing bodies maximize opportunity structures for disabled people to participate fully in society.
This proposal is unique in employing mixed-methods life course research across time. First, it involves quantitative analysis of Sweden’s long-term digitized population databases, which reflect how disability impacts on people’s educational, occupational, marital and survival chances. The statistical outcome is novel in demonstrating how different impairments intersect with human characteristics relative to society’s structures of the past 200 years. Second, qualitative analyses uncover how disabled people today experience and talk about the above dimensions (1-4) themselves, and how mass media depict them. Third, I make innovative studies of leisure structures, which may promote liveable disabilities.
The proposal aims to establish me at the forefront of disability research. It benefits from my scholarship in history and demography and from three excellent centres at Umeå University I am connected to, funded by the Swedish Research Council. One centre researches populations, another gender. The third provides expertise in disability studies and ready access to stakeholders outside academia.
Summary
In Europe today disabled people comprise some 65 million (10%). Yet they are marginalized in society and research, and little is known on how disabilities become liveable. This project challenges this bias by proposing to investigate ‘liveable disabilities’ as a function of disability and opportunity structures across time. It analyses four life course dimensions: disabled people’s (1) health and well-being; (2) involvement in education and work; (3) in a partner relationship and family; and (4) in leisure structures. Through this I identify liveable disabilities before, during and after the Swedish welfare state. The results are of significant cross-national interest as they form a useful baseline for what constitutes liveable disabilities, which helps governing bodies maximize opportunity structures for disabled people to participate fully in society.
This proposal is unique in employing mixed-methods life course research across time. First, it involves quantitative analysis of Sweden’s long-term digitized population databases, which reflect how disability impacts on people’s educational, occupational, marital and survival chances. The statistical outcome is novel in demonstrating how different impairments intersect with human characteristics relative to society’s structures of the past 200 years. Second, qualitative analyses uncover how disabled people today experience and talk about the above dimensions (1-4) themselves, and how mass media depict them. Third, I make innovative studies of leisure structures, which may promote liveable disabilities.
The proposal aims to establish me at the forefront of disability research. It benefits from my scholarship in history and demography and from three excellent centres at Umeå University I am connected to, funded by the Swedish Research Council. One centre researches populations, another gender. The third provides expertise in disability studies and ready access to stakeholders outside academia.
Max ERC Funding
1 999 870 €
Duration
Start date: 2016-02-01, End date: 2021-07-31
Project acronym EVILTONGUE
Project No Sword Bites So Fiercly as an Evil Tongue?Gossip Wrecks Reputation, but Enhances Cooperation
Researcher (PI) Karoly Takacs
Host Institution (HI) LINKOPINGS UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), SH2, ERC-2014-CoG
Summary Social norms in general, and norms of cooperation in particular, are the cement of all human societies. For the difficult problems of the maintenance and enforcement of social norms and of cooperation, humans have developed surprisingly complex solutions. Reputation mechanisms and gossip are certainly among the compound informal solutions.
According to common wisdom, gossip channels mainly negative and often fictitious information. If it is so, how can dishonest gossip and the resulting biased reputations legitimize social order and promote cooperation?
This is the main puzzle we tackle in the proposed project exploiting a wide scale of instruments. We use analytical modeling and agent-based simulation to derive hypotheses. We test simple hypotheses in small group experiments. We develop new methodological tools to appropriately analyze the triadic nature of gossip embedded in network flows of information. We utilize dynamic network datasets from primary and secondary school classes, and we gather qualitative and quantitative information from organizations to test conditional hypotheses about the role that gossip plays in reputation and cooperation in different developmental and social contexts of life. In addition, we apply new communication technologies currently under development to explore the hidden world of gossip and the dynamics of reputations in dormitories and organizations.
With the insights gained, we can overcome common stereotypes about gossip and highlight how gossip is related to credible reputational signals, cooperation, and social order. Expected results will help us to outline the conditions that can promote cooperativeness in work groups, and they will help to construct successful prevention strategies of social exclusion and other potentially harmful consequences of the evil tongue.
Summary
Social norms in general, and norms of cooperation in particular, are the cement of all human societies. For the difficult problems of the maintenance and enforcement of social norms and of cooperation, humans have developed surprisingly complex solutions. Reputation mechanisms and gossip are certainly among the compound informal solutions.
According to common wisdom, gossip channels mainly negative and often fictitious information. If it is so, how can dishonest gossip and the resulting biased reputations legitimize social order and promote cooperation?
This is the main puzzle we tackle in the proposed project exploiting a wide scale of instruments. We use analytical modeling and agent-based simulation to derive hypotheses. We test simple hypotheses in small group experiments. We develop new methodological tools to appropriately analyze the triadic nature of gossip embedded in network flows of information. We utilize dynamic network datasets from primary and secondary school classes, and we gather qualitative and quantitative information from organizations to test conditional hypotheses about the role that gossip plays in reputation and cooperation in different developmental and social contexts of life. In addition, we apply new communication technologies currently under development to explore the hidden world of gossip and the dynamics of reputations in dormitories and organizations.
With the insights gained, we can overcome common stereotypes about gossip and highlight how gossip is related to credible reputational signals, cooperation, and social order. Expected results will help us to outline the conditions that can promote cooperativeness in work groups, and they will help to construct successful prevention strategies of social exclusion and other potentially harmful consequences of the evil tongue.
Max ERC Funding
1 973 500 €
Duration
Start date: 2015-12-01, End date: 2020-11-30
Project acronym FASDEM
Project Failing and Successful Sequences of Democratization
Researcher (PI) Staffan I. LINDBERG
Host Institution (HI) GOETEBORGS UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), SH2, ERC-2016-COG
Summary The study of democratization lies at the center of political science and is increasingly important in economics, sociology, and history, and has become a central foreign policy objective. Yet, there is little conclusive evidence about in particular endogenous sequences of democratization critical to our ability to provide sound policy advise. FASDEM promises to revolutionize our understanding of the trajectories that fail to lead to democracy, and the pathways that are successful, by addressing two key questions: Which are the failing versus successful sequences of democratization? What are the determining causal relationships in these sequences?
Critical is the just finalized Varieties of Democracy (V-Dem) dataset including some 350 indicators, 34 component-indices, and five main indices of varieties of democracy from 1900 to the present for 173countries – about 15 million data points on democracy. FASDEM, if funded, will use this data capitalizing on a set of novel analytical approaches, tools, and adaptations of modeling from evolutionary biology developed by a research team in a related, project, that together can establish sequences between sets of hundreds of ordinal variables. Under the second objective, FASDEM will take a step further developing upon the latest statistical methodologies of establishing causal identification in observational data, and use these to test each step of such manifest sequences. FASDEM will make a radical departure from the crude and “correlational” paradigm in democratization studies to detail and explain failing and successful sequences of democratization for the first time.
Summary
The study of democratization lies at the center of political science and is increasingly important in economics, sociology, and history, and has become a central foreign policy objective. Yet, there is little conclusive evidence about in particular endogenous sequences of democratization critical to our ability to provide sound policy advise. FASDEM promises to revolutionize our understanding of the trajectories that fail to lead to democracy, and the pathways that are successful, by addressing two key questions: Which are the failing versus successful sequences of democratization? What are the determining causal relationships in these sequences?
Critical is the just finalized Varieties of Democracy (V-Dem) dataset including some 350 indicators, 34 component-indices, and five main indices of varieties of democracy from 1900 to the present for 173countries – about 15 million data points on democracy. FASDEM, if funded, will use this data capitalizing on a set of novel analytical approaches, tools, and adaptations of modeling from evolutionary biology developed by a research team in a related, project, that together can establish sequences between sets of hundreds of ordinal variables. Under the second objective, FASDEM will take a step further developing upon the latest statistical methodologies of establishing causal identification in observational data, and use these to test each step of such manifest sequences. FASDEM will make a radical departure from the crude and “correlational” paradigm in democratization studies to detail and explain failing and successful sequences of democratization for the first time.
Max ERC Funding
2 000 000 €
Duration
Start date: 2017-03-01, End date: 2023-02-28
Project acronym HISTORICALDATABASE
Project The Swedish historical database project
Researcher (PI) Per Einar Pettersson Lidbom
Host Institution (HI) STOCKHOLMS UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), SH1, ERC-2013-CoG
Summary The Swedish historical data base project will put together and make publicly available highly disaggregated data on roughly a yearly basis for about 2500 Swedish administrative districts over the period 1749-1952. The finished data set will consist of comprehensive and detailed information on economic activity, political characteristics, vital statistics, occupational structure, education, social and agriculture statistics and infrastructure investments (e.g., railway construction). The comprehensiveness and complete coverage of historical data at the local administrative level is what makes this project unique from an international perspective. Since Sweden has the longest continuous and reliable data series on population and vital statistics in the world,starting as early as 1749, makes it possible to construct a comprehensive panel data set over all 2,500 Swedish local administrative units covering a 200 year period. Consequently, the total number of observations for each variable can be as large as 0.5 million (N=2500×T=200). With this type of rich and disaggregated historical data it become possible to get a better understanding of economic growth, structural transformation and economic development. Also, within-country variation allows for more satisfying empirical identification strategies such as instrumental variables, regression discontinuities or difference-in-differences estimation. As a case in point, I have demonstrated the potential usefulness of the Swedish historical data by addressing the question of whether redistribution of resources towards the poor differs between types of democracy after democratization. The identification strategy is based on a regression-discontinuity design where the type of democracy partly is a function of population size. This paper is currently “revise and resubmit” 2nd round at Econometrica. After collecting the new data, we intend to studying a number of questions related to economic development and growth.
Summary
The Swedish historical data base project will put together and make publicly available highly disaggregated data on roughly a yearly basis for about 2500 Swedish administrative districts over the period 1749-1952. The finished data set will consist of comprehensive and detailed information on economic activity, political characteristics, vital statistics, occupational structure, education, social and agriculture statistics and infrastructure investments (e.g., railway construction). The comprehensiveness and complete coverage of historical data at the local administrative level is what makes this project unique from an international perspective. Since Sweden has the longest continuous and reliable data series on population and vital statistics in the world,starting as early as 1749, makes it possible to construct a comprehensive panel data set over all 2,500 Swedish local administrative units covering a 200 year period. Consequently, the total number of observations for each variable can be as large as 0.5 million (N=2500×T=200). With this type of rich and disaggregated historical data it become possible to get a better understanding of economic growth, structural transformation and economic development. Also, within-country variation allows for more satisfying empirical identification strategies such as instrumental variables, regression discontinuities or difference-in-differences estimation. As a case in point, I have demonstrated the potential usefulness of the Swedish historical data by addressing the question of whether redistribution of resources towards the poor differs between types of democracy after democratization. The identification strategy is based on a regression-discontinuity design where the type of democracy partly is a function of population size. This paper is currently “revise and resubmit” 2nd round at Econometrica. After collecting the new data, we intend to studying a number of questions related to economic development and growth.
Max ERC Funding
1 200 000 €
Duration
Start date: 2014-04-01, End date: 2019-03-31
Project acronym MUSES
Project Towards middle-range theories of the co-evolutionary dynamics of multi-level social-ecological systems
Researcher (PI) Maja Schlueter
Host Institution (HI) STOCKHOLMS UNIVERSITET
Country Sweden
Call Details Consolidator Grant (CoG), SH3, ERC-2015-CoG
Summary Humans have the capacity to change the biosphere from local to global scales while at the same time fundamentally depending on a functioning biosphere for their well-being. Moreover human societies are increasingly affected by global change and adapting to it in multiple ways. These interdependencies give rise to non-linear, cross-scale dynamics that pose significant challenges for analysis and governance of social-ecological systems (SES). In view of the need for societal transformations towards sustainability is the identification of mechanisms of change in SES an urgent and cutting-edge research frontier. This project aims to develop new methodologies and middle-range theories of the dynamics of SES. It will take the nature of SES as complex adaptive systems into account by developing a mechanism-based understanding of change in SES as it arises from micro-level interactions within complex networks of actors and ecosystems. Particular emphasis will be put on emergent and top-down cross-scale interactions.
To this end we will develop dynamic multi-level models using agent-based and mathematical modeling approaches. Model development will be based on a typology of cross-scale interactions, theories from the natural and social sciences and empirical evidence from marine and terrestrial SES. We will combine stylized with empirically-based models and cross-case comparison to develop a typology of social-ecological configurations of the long-term persistence of SES and their capacity to change. Knowledge integration across disciplines and the development of integrative frameworks and approaches will be supported by procedures to bridge different ontological and epistemological foundations. The project will advance sustainability science by providing new methods for modeling multi-level SES and cross-scale interactions, and approaches to identify and include critical social-ecological interactions, particularly human adaptive responses, into models of SES.
Summary
Humans have the capacity to change the biosphere from local to global scales while at the same time fundamentally depending on a functioning biosphere for their well-being. Moreover human societies are increasingly affected by global change and adapting to it in multiple ways. These interdependencies give rise to non-linear, cross-scale dynamics that pose significant challenges for analysis and governance of social-ecological systems (SES). In view of the need for societal transformations towards sustainability is the identification of mechanisms of change in SES an urgent and cutting-edge research frontier. This project aims to develop new methodologies and middle-range theories of the dynamics of SES. It will take the nature of SES as complex adaptive systems into account by developing a mechanism-based understanding of change in SES as it arises from micro-level interactions within complex networks of actors and ecosystems. Particular emphasis will be put on emergent and top-down cross-scale interactions.
To this end we will develop dynamic multi-level models using agent-based and mathematical modeling approaches. Model development will be based on a typology of cross-scale interactions, theories from the natural and social sciences and empirical evidence from marine and terrestrial SES. We will combine stylized with empirically-based models and cross-case comparison to develop a typology of social-ecological configurations of the long-term persistence of SES and their capacity to change. Knowledge integration across disciplines and the development of integrative frameworks and approaches will be supported by procedures to bridge different ontological and epistemological foundations. The project will advance sustainability science by providing new methods for modeling multi-level SES and cross-scale interactions, and approaches to identify and include critical social-ecological interactions, particularly human adaptive responses, into models of SES.
Max ERC Funding
1 969 599 €
Duration
Start date: 2017-02-01, End date: 2022-01-31
Project acronym PLASMA
Project Running away and radiating
Researcher (PI) Tuende-Maria Fueloep
Host Institution (HI) CHALMERS TEKNISKA HOEGSKOLA AB
Country Sweden
Call Details Consolidator Grant (CoG), PE2, ERC-2014-CoG
Summary Particle acceleration and radiation in plasmas has a wide variety of applications, ranging from cancer therapy and lightning initiation, to the improved design of fusion devices for large scale energy production. The goal of this project is to build a flexible ensemble of theoretical and numerical models that describes the acceleration processes and the resulting fast particle dynamics in two focus areas: magnetic fusion plasmas and laser-produced plasmas. This interdisciplinary approach is a new way of studying charged particle acceleration. It will lead to a deeper understanding of the complex interactions that characterise fast particle behaviour in plasmas. Plasmas are complex systems, with many kinds of interacting electromagnetic (EM) waves and charged particles. For such a system it is infeasible to build one model which captures both the small scale physics and the large scale phenomena. Therefore we aim to develop several complementary models, in one common framework, and make sure they agree in overlapping regions. The common framework will be built layer-by-layer, using models derived from first principles in a systematic way, with theory closely linked to numerics and validated by experimental observations. The key object of study is the evolution of the velocity-space particle distribution in time and space. The main challenge is the strong coupling between the distribution and the EM-field, which requires models with self-consistent coupling of Maxwell’s equations and kinetic equations. For the latter we will use Vlasov-Fokker-Planck solvers extended with advanced collision operators. Interesting aspects include non-Maxwellian distributions, instabilities, shock-wave formation and avalanches. The resulting theoretical framework and the corresponding code-suite will be a novel instrument for advanced studies of charged particle acceleration. Due to the generality of our approach, the applicability will reach far beyond the two focus areas.
Summary
Particle acceleration and radiation in plasmas has a wide variety of applications, ranging from cancer therapy and lightning initiation, to the improved design of fusion devices for large scale energy production. The goal of this project is to build a flexible ensemble of theoretical and numerical models that describes the acceleration processes and the resulting fast particle dynamics in two focus areas: magnetic fusion plasmas and laser-produced plasmas. This interdisciplinary approach is a new way of studying charged particle acceleration. It will lead to a deeper understanding of the complex interactions that characterise fast particle behaviour in plasmas. Plasmas are complex systems, with many kinds of interacting electromagnetic (EM) waves and charged particles. For such a system it is infeasible to build one model which captures both the small scale physics and the large scale phenomena. Therefore we aim to develop several complementary models, in one common framework, and make sure they agree in overlapping regions. The common framework will be built layer-by-layer, using models derived from first principles in a systematic way, with theory closely linked to numerics and validated by experimental observations. The key object of study is the evolution of the velocity-space particle distribution in time and space. The main challenge is the strong coupling between the distribution and the EM-field, which requires models with self-consistent coupling of Maxwell’s equations and kinetic equations. For the latter we will use Vlasov-Fokker-Planck solvers extended with advanced collision operators. Interesting aspects include non-Maxwellian distributions, instabilities, shock-wave formation and avalanches. The resulting theoretical framework and the corresponding code-suite will be a novel instrument for advanced studies of charged particle acceleration. Due to the generality of our approach, the applicability will reach far beyond the two focus areas.
Max ERC Funding
1 948 750 €
Duration
Start date: 2015-10-01, End date: 2020-09-30
Project acronym REBOOT
Project Releasing the brakes on adult plasticity
Researcher (PI) Martin Loevden
Host Institution (HI) KAROLINSKA INSTITUTET
Country Sweden
Call Details Consolidator Grant (CoG), SH4, ERC-2013-CoG
Summary Age-related cognitive impairments compromise the functional capacity of aging individuals, and create major individual and societal costs. Developing means for preserving and restoring cognitive functioning in old age is therefore of great importance. Age-related cognitive impairments have a complex and multifactorial etiology. Pharmaceutical approaches to prevention and treatment have therefore been unsuccessful, and searching for non-pharmaceutical approaches is important. Results of cognitive training studies have so far been disappointing. I hypothesize that the reason for this is that plasticity is functionally inhibited after normal childhood development. Plasticity is then further reduced in aging due to negative brain changes. In this sense, past studies on the effects of cognitive training in adulthood and old age have, so to speak, attempted to push a car that has the brakes on. In a series of experimental studies on humans, my research team will discover feasible ways to release inhibitory brakes on adult plasticity, develop routes to attenuate age-related negative effects on plasticity, and uncover the neural mediators of training-related change in performance, so that the effects of cognitive training can be increased and better understood. Outcome variables include measures of brain function, volume, and integrity acquired using high-resolution magnetic resonance imaging, and up-to-date measures of cognitive performance. Experimental effects on these measures will be evaluated using structural equation models suitable for analyzing repeated measures. This amalgamation of state-of-the-art methodology in the neurosciences and the behavioral sciences bolsters the uniqueness of this research program, which will enlighten the mechanisms of plasticity at neuronal and behavioral levels of analysis. The resulting insights will pave the way for effective rehabilitation of several neurological conditions and for reducing age-associated cognitive impairments.
Summary
Age-related cognitive impairments compromise the functional capacity of aging individuals, and create major individual and societal costs. Developing means for preserving and restoring cognitive functioning in old age is therefore of great importance. Age-related cognitive impairments have a complex and multifactorial etiology. Pharmaceutical approaches to prevention and treatment have therefore been unsuccessful, and searching for non-pharmaceutical approaches is important. Results of cognitive training studies have so far been disappointing. I hypothesize that the reason for this is that plasticity is functionally inhibited after normal childhood development. Plasticity is then further reduced in aging due to negative brain changes. In this sense, past studies on the effects of cognitive training in adulthood and old age have, so to speak, attempted to push a car that has the brakes on. In a series of experimental studies on humans, my research team will discover feasible ways to release inhibitory brakes on adult plasticity, develop routes to attenuate age-related negative effects on plasticity, and uncover the neural mediators of training-related change in performance, so that the effects of cognitive training can be increased and better understood. Outcome variables include measures of brain function, volume, and integrity acquired using high-resolution magnetic resonance imaging, and up-to-date measures of cognitive performance. Experimental effects on these measures will be evaluated using structural equation models suitable for analyzing repeated measures. This amalgamation of state-of-the-art methodology in the neurosciences and the behavioral sciences bolsters the uniqueness of this research program, which will enlighten the mechanisms of plasticity at neuronal and behavioral levels of analysis. The resulting insights will pave the way for effective rehabilitation of several neurological conditions and for reducing age-associated cognitive impairments.
Max ERC Funding
1 918 070 €
Duration
Start date: 2014-07-01, End date: 2019-06-30
