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actor network theory or actor-network

Scott Winch, Nageen Ahmed, Christopher Rissel, Michelle Maxwell, Joanna Coutts, Kerri Lucas
The aim of the present paper was to explore how social networks enable dissemination of health information within two Aboriginal communities in New South Wales. The study design was modelled on a social network analysis socio-centric model. Data collection was conducted primarily by Aboriginal community members who were trained as community researchers. Participants reported on their patterns of interaction and who they provided or received health information from, and awareness of the Aboriginal Enhancement of the Get Healthy Information and Coaching Service...
October 19, 2016: Australian Journal of Primary Health
Vincent Buskens, Chris Snijders
We study how payoffs and network structure affect reaching the payoff-dominant equilibrium in a [Formula: see text] coordination game that actors play with their neighbors in a network. Using an extensive simulation analysis of over 100,000 networks with 2-25 actors, we show that the importance of network characteristics is restricted to a limited part of the payoff space. In this part, we conclude that the payoff-dominant equilibrium is chosen more often if network density is larger, the network is more centralized, and segmentation of the network is smaller...
2016: Dynamic Games and Applications
Julia Schellong, Franziska Epple, Kerstin Weidner, Andrea Möllering
A non-neglectable portion of people that have fled to Germany have been subjected to expulsion, violence, torture and grave human loss. In some of them, signs of secondary mental problems are obvious. In the light of the efforts at integration, these diseases must not be neglected. Outlined are the federal legal requirements and how the cost coverage, as well as the admission to health care system, is structured. Additionally, 2 exemplary regional models for psychosomatic health care are being introduced: Dresden's "Stepped Care Model for Psychologically Vulnerable Refugees" includes phased offers for prevention and treatment of acute mental crises, as well as somatoform disorders in refugees and their volunteer helpers...
October 17, 2016: Psychotherapie, Psychosomatik, Medizinische Psychologie
Laura Arroyo, Ricard Carreras, Daniel Valent, Raquel Peña, Eva Mainau, Antonio Velarde, Josefa Sabrià, Anna Bassols
Chemical neurotransmitters (NT) are principal actors in all neuronal networks of animals. The central nervous system plays an important role in stress susceptibility and organizes the response to a stressful situation through the interaction of the dopaminergic and the serotonergic pathways, leading to the activation of the hypothalamus-pituitary-adrenal axis (HPA). This study was designed to investigate: a) the effects of stressful handling of pigs at the slaughterhouse on the neurotransmitter profile in four brain areas: amygdala, prefrontal cortex (PFC), hippocampus and hypothalamus, and b) whether the alterations in the brain NT profile after stressful handling were associated with fear, determined by the tonic immobility (TI) test...
October 11, 2016: Physiology & Behavior
Michael Parker, Patricia Kingori
There has been a dramatic rise in the scale and scope of collaborative global health research. A number of structural and scientific factors explain this growth and there has been much discussion of these in the literature. Little, if any, attention has been paid, however, to the factors identified by scientists and other research actors as important to successful research collaboration. This is surprising given that their decisions are likely to play a key role in the sustainability and effectiveness of global health research initiatives...
2016: PloS One
Christos Coucoravas, Soniya Dhanjal, Sofia Henriksson, Stefanie Böhm, Marianne Farnebo
The cellular response to DNA double-strand breaks is orchestrated by the protein kinase ATM, which phosphorylates key actors in the DNA repair network. WRAP53β is a multifunctional protein that controls trafficking of factors to Cajal bodies, telomeres and DNA double-strand breaks but what regulates the involvement of WRAP53β in these separate processes remains unclear. Here, we show that in response to various types of DNA damage, including IR and UV, WRAP53β is phosphorylated on serine residue 64 by ATM with a time-course that parallels its accumulation at DNA lesions...
October 7, 2016: RNA Biology
Ulla Walter, Iris Pigeot
BACKGROUND: Despite an obvious stabilization the prevalence of childhood overweight and obesity is still too high. Since childhood obesity may track into adulthood and lead to major health consequences, effective primary prevention programs are of high relevance. OBJECTIVE: In recent years several universal primary prevention programs, measures or projects have been developed and evaluated in Germany. This paper gives an overview. METHODS: An internet search and a search in the archive of the Deutsche Ärzteblatt were conducted to identify universal programs in Germany from 2006 to 2015...
October 5, 2016: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
K Cullerton, T Donnet, A Lee, D Gallegos
The food industry is often described as having more power and influence in nutrition policymaking than nutrition professionals, scientists and other practitioners working for the public interest; yet authors often allude to this point as an assumed truth, rather than an evidence-based fact. This paper applies social network analysis techniques to provide a concise evidence-based demonstration of the food industry's capacity to influence nutrition policymaking networks in Australia. Network analysis using four rounds of data collection was undertaken, and the capacity of individual actors and occupational categories to influence policy decision makers were analysed...
October 5, 2016: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
Kirk Dombrowski, Bilal Khan, Patrick Habecker, Holly Hagan, Samuel R Friedman, Mohamed Saad
This article explores how social network dynamics may have reduced the spread of HIV-1 infection among people who inject drugs during the early years of the epidemic. Stochastic, discrete event, agent-based simulations are used to test whether a "firewall effect" can arise out of self-organizing processes at the actor level, and whether such an effect can account for stable HIV prevalence rates below population saturation. Repeated simulation experiments show that, in the presence of recurring, acute, and highly infectious outbreaks, micro-network structures combine with the HIV virus's natural history to reduce the spread of the disease...
October 3, 2016: AIDS and Behavior
Emmanuelle Courtiol, Donald A Wilson
Olfactory perception and its underlying neural mechanisms are not fixed, but rather vary over time, dependent on various parameters such as state, task, or learning experience. In olfaction, one of the primary sensory areas beyond the olfactory bulb is the piriform cortex. Due to an increasing number of functions attributed to the piriform cortex, it has been argued to be an associative cortex rather than a simple primary sensory cortex. In fact, the piriform cortex plays a key role in creating olfactory percepts, helping to form configural odor objects from the molecular features extracted in the nose...
September 28, 2016: Perception
Eitan Schechtman, Maria Imelda Noblejas, Aviv D Mizrahi, Omer Dauber, Hagai Bergman
The basal ganglia (BG) network has been divided into interacting actor and critic components, modulating the probabilities of different state-action combinations through learning. Most models of learning and decision making in the BG focus on the roles of the striatum and its dopaminergic inputs, commonly overlooking the complexities and interactions of BG downstream nuclei. In this study, we aimed to reveal the learning-related activity of the external segment of the globus pallidus (GPe), a downstream structure whose computational role has remained relatively unexplored...
October 11, 2016: Proceedings of the National Academy of Sciences of the United States of America
Pierre Mandin, Sylvia Chareyre, Frédéric Barras
UNLABELLED: Fe-S clusters are cofactors conserved through all domains of life. Once assembled by dedicated ISC and/or SUF scaffolds, Fe-S clusters are conveyed to their apo-targets via A-type carrier proteins (ATCs). Escherichia coli possesses four such ATCs. ErpA is the only ATC essential under aerobiosis. Recent studies reported a possible regulation of the erpA mRNA by the small RNA (sRNA) RyhB, which controls the expression of many genes under iron starvation. Surprisingly, erpA has not been identified in recent transcriptomic analysis of the iron starvation response, thus bringing into question the actual physiological significance of the putative regulation of erpA by RyhB...
September 20, 2016: MBio
Brian Aronson
The prevalence of Attention Deficit and Hyperactivity Disorder (ADHD) is growing in America, but its cause is unclear. Scholars have identified many environmental factors that can cause or confound ADHD diagnosis, but epidemiological studies that try to control for confounding factors still find evidence that rates of ADHD diagnosis are increasing. As a preliminary explanation to ADHD's increasing prevalence, this article examines whether core ADHD diagnostic traits are subject to peer influence. If ADHD diagnosis can be confounded by peer influence, there are several mechanisms that could have caused increased rates of diagnosis...
November 2016: Social Science & Medicine
Nathalie Holvoet, Sara Dewachter, Nadia Molenaers
Many national water policies propagate community-based participatory approaches to overcome weaknesses in supply-driven rural water provision, operation, and maintenance. Citizen involvement is thought to stimulate bottom-up accountability and broaden the information base, which may enrich design and implementation processes and foster improved water accessibility and sustainability. Practices on the ground, however, are embedded in socio-political realities which mediate possible beneficial effects of participatory approaches...
November 2016: Environmental Management
Marjolein I Broese van Groenou, Alice De Boer
The ageing of society is leading to significant reforms in long-term care policy and systems in many European countries. The cutbacks in professional care are increasing demand for informal care considerably, from both kin and non-kin. At the same time, demographic and societal developments such as changing family structures and later retirement may limit the supply of informal care. This raises the question as to whether the volume of informal care (in people) will increase in the years ahead. This paper aims to provide a theoretical answer to this question in two steps...
2016: European Journal of Ageing
Lu Dong, Xiangnan Zhong, Changyin Sun, Haibo He
In this paper, an event-triggered near optimal control structure is developed for nonlinear continuous-time systems with control constraints. Due to the saturating actuators, a nonquadratic cost function is introduced and the Hamilton-Jacobi-Bellman (HJB) equation for constrained nonlinear continuous-time systems is formulated. In order to solve the HJB equation, an actor-critic framework is presented. The critic network is used to approximate the cost function and the action network is used to estimate the optimal control law...
August 31, 2016: IEEE Transactions on Neural Networks and Learning Systems
Lia Ginaldi, Massimo De Martinis
OBJECTIVE: Osteoimmunology investigates interactions between skeleton and immune system. In the light of recent discoveries in this field, a new reading register of osteoporosis is actually emerging, in which bone and immune cells are strictly interconnected. Osteoporosis could therefore be considered a chronic immune mediated disease which shares with other age related disorders a common inflammatory background. Here, we highlight these recent discoveries and the new landscape that is emerging...
September 7, 2016: Current Medicinal Chemistry
Dara Ivanova, Iris Wallenburg, Roland Bal
In this article we analyse the process of the multiple ways place and care shape each other and are co-produced and co-functioning. The resulting emerging assemblage of this co-constituent process we call a carescape. Focusing on a case study of a nursing home on a Dutch island, we use place as a theoretical construct for analysing how current changes in healthcare governance interact with mundane practices of care. In order to make the patterns of care in our case explicit, we use actor-network theory (ANT) sensibilities and especially the concept of assemblage...
August 31, 2016: Sociology of Health & Illness
Ana Claudia Figueiro, Sydia Rosana de Araújo Oliveira, Zulmira Hartz, Yves Couturier, Jocelyne Bernier, Maria do Socorro Machado Freire, Isabella Samico, Maria Guadalupe Medina, Ronice Franco de Sa, Louise Potvin
OBJECTIVES: Public health interventions are increasingly represented as complex systems. Research tools for capturing the dynamic of interventions processes, however, are practically non-existent. This paper describes the development and proof of concept process of an analytical tool, the critical event card (CEC), which supports the representation and analysis of complex interventions' evolution, based on critical events. METHODS: Drawing on the actor-network theory (ANT), we developed and field-tested the tool using three innovative health interventions in northeastern Brazil...
August 29, 2016: International Journal of Public Health
Patrick O Waeber, Lucienne Wilmé, Jean-Roger Mercier, Christian Camara, Porter P Lowry
Conservation and development are intricately linked. The international donor community has long provided aid to tropical countries in an effort to alleviate poverty and conserve biodiversity. While hundreds of millions of $ have been invested in over 500 environmental-based projects in Madagascar during the period covered by a series of National Environmental Action Plans (1993-2008) and the protected areas network has expanded threefold, deforestation remains unchecked and none of the eight Millennium Development Goals (MDGs) established for 2000-2015 were likely be met...
2016: PloS One
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