846 research outputs found
Double Switch With Hemi-Mustard and Bidirectional Glenn Procedure for âAnatomicalâ Repair of Corrected Transposition
NumeraciĂłn errĂłnea en el original
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The human CTF4-orthologue AND-1 interacts with DNA polymerase α/primase via its unique C-terminal HMG box
A dynamic multi-protein assembly known as the replisome is responsible for DNA synthesis in eukaryotic cells. In yeast, the hub protein Ctf4 bridges DNA helicase and DNA polymerase and recruits factors with roles in metabolic processes coupled to DNA replication. An important question in DNA replication is the extent to which the molecular architecture of the replisome is conserved between yeast and higher eukaryotes. Here we describe the biochemical basis for the interaction of the human CTF4-orthologue AND-1 with Pol α/primase, the replicative polymerase that
initiates DNA synthesis. AND-1 has maintained the trimeric structure of yeast Ctf4, driven by its conserved SepB domain. However, the primary interaction of AND-1 with Pol α/primase is mediated by its C-terminal HMG box, unique to mammalian AND-1, which binds the B subunit, at the same site targeted by the SV40 T antigen for viral replication. In addition, we report a novel DNA-binding activity in AND-1, which might promote the correct positioning of Pol α/primase on the lagging-strand template at the replication fork. Our findings provide a biochemical basis for the specific interaction between two critical components of the human replisome, and
indicate that important principles of replisome architecture have changed
significantly in evolution.This work was supported by a Wellcome Trust investigator award to L.P. (104641/Z/14/Z), a Cambridge Gates PhD scholarship to A.C.S., a PhD fellowship of the Boehringer-Ingelheim Fonds and awards from the Janggen-Pöhn-Stiftung and the Swiss National Science Foundation to S.H
US Hegemony and Regime Change in Latin America
We contribute to the extensive literature on international influences on democratization and democratic breakdowns by conceptualizing hegemonic mechanisms of regime change and assessing them empirically. Our findings are based on a multi-methods approach and highlight the varying importance of hegemonic influences in post-1945 Latin America. We argue that us support for democratization was consistent in the wave of transitions to democracy that began in Latin America in 1978 and that it was decisive in many of these transitions. While past work has attributed responsibility to the us for the waves of democratic breakdowns from 1948 to 1956 and 1964 to 1976, an examination of the 27 breakdowns from 1945 to 2010 gives reason to doubt this interpretation. Future research could use these conceptual and methodological tools to explore the role of other powers in waves of democracy and authoritarianism. </div
Immigration detention: an Anglo model
Over the last twenty-five years, immigration detention policies and practices have proliferated around the globe. We look at four liberal democratic countries with the largest immigration detention systemsâAustralia, Canada, the United Kingdom, and the United Statesâand identify components of an immigration detention policy âpackageâ as well as historical parallels in the early adoption of detention in these countries. This âAnglo modelâ of detention is based on three main features: (1) the existence of indefinite and/or mandatory immigration detention policies; (2) the use of private security actors and infrastructure; and (3) the use of creative legal geographies in order to interdict and detain people offshore. Past scholarship on detention has focused on single national case studies or assumed the leadership of the US as the primary innovator in the field. Our paper establishes the empirical and theoretical grounds for considering these countries as a group and suggests a more complex process of policy adoption among them. Identifying an Anglo model of detention lays the critical groundwork for understanding the expansion of immigration detention and the transnational diffusion of detention policies among these countries, as well as where and how countervailing pressures to detention might form
Lifelogging user study:bystander privacy
Automatically and passively taking pictures (using lifelogging devices such as wearable cameras) of people who donât know theyâre having their picture taken raises a number of privacy concerns (from a bystanderâs perspective). We conducted a study focussing on the bystandersâ concerns to the presence of augmented reality wearable devices in two contexts (one formal and one informal). The results suggests the need to embed privacy enhancing techniques into the design of lifelogging applications, which are likely to depend upon an array of factors, but not limited to the context of use, scenario (and surroundings), and content
Party system closure and openness: conceptualization, operationalization and validation
The degree of closure of the governmental arena is a central aspect of the stabilization of party systems, and yet little systematic effort has been devoted to its operationalization. The article proposes a new index, examines its reliability and validity, and reports the ranking of 60 party systems. By redefining the units of measurement we suggest new indicators that are uniform and transparent in their logic of construction, can be applied both to specific government-changes and to time periods, and are sensitive to the degree of change. The article finds a hierarchy among the components of party system closure, dominated by coalition formula. While new and established democracies can both produced closed patterns, the analysis of inter-war European party systems shows that closed systems are less prone to authoritarian takeover. The article demonstrates the power of inertia: the completely closed configurations stand out as the most durable ones
Itâs been mostly about money!: a multi-method research approach to the sources of institutionalization
Although much has been written about the process of party system insti- tutionalization in different regions, the reasons why some party systems institutionalize while others do not still remain a mystery. Seeking to fill this lacuna in the literature, and using a mixed-methods research approach, this article constitutes a first attempt to answer simultaneously the following three questions: (1) What specific factors help party systems to institutio- nalize (or not)? (2) What are the links (in terms of time and degree) as well as the causal mechanisms behind such relationships? and (3) how do they affect a particular party system? In order to do so, this article focuses on the study of party system development and institutionalization in 13 postcommunist democracies between 1990 and 2010. Methodologically, the article innovates in five respects. First, it continues the debate on the importance of ââmixed methodsââ when trying to answer different research questions. Second, it adds to the as yet brief literature on the combination of process tracing and qualitative comparative analysis. Third, it constitutes the first attempt to date to use a most similar different outcome/most different same outcome pro- cedure in order to reduce causal complexity before undertaking a crisp-set qualitative comparative analysis. Third, it also shows the merits of combining both congruence and process tracing in the same comparative study. Finally, it also develops a novel ââbipolar comparative methodââ to explain the extent to which opposite outcomes are determined by reverse conditions and conflicting intervening causal forces
An empirical investigation of dance addiction
Although recreational dancing is associated with increased physical and psychological well-being, little is known about the harmful effects of excessive dancing. The aim of the present study was to explore the psychopathological factors associated with dance addiction. The sample comprised 447 salsa and ballroom dancers (68% female, mean age: 32.8 years) who danced recreationally at least once a week. The Exercise Addiction Inventory (Terry, Szabo, & Griffiths, 2004) was adapted for dance (Dance Addiction Inventory, DAI). Motivation, general mental health (BSI-GSI, and Mental Health Continuum), borderline personality disorder, eating disorder symptoms, and dance motives were also assessed. Five latent classes were explored based on addiction symptoms with 11% of participants belonging to the most problematic class. DAI was positively associated with psychiatric distress, borderline personality and eating disorder symptoms. Hierarchical linear regression model indicated that Intensity (Ă=0.22), borderline (Ă=0.08), eating disorder (Ă=0.11) symptoms, as well as Escapism (Ă=0.47) and Mood Enhancement (Ă=0.15) (as motivational factors) together explained 42% of DAI scores. Dance addiction as assessed with the Dance Addiction Inventory is associated with indicators of mild psychopathology and therefore warrants further research
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