105 research outputs found
Accountable democracy: Citizens' impact on public decision making in postdictatorship chile
Using a Santiago, Chile, health group as an ethnographic case study, I propose “accountable democracy” as an alternative normative project to the theory of deliberative democracy outlined by Habermas in Between Facts and Norms . Accountable democracy has at its center the impact of public-sphere opinion formation on decision making by officials in elected governments.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73684/1/ae.2004.31.4.497.pd
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Author Correction: Structural evidence for intermediates during O2 formation in photosystem II
Correction to: Naturehttps://doi.org/10.1038/s41586-023-06038-z Published online 3 May 2023 In the version of the article originally published, it was not clarified that the raw data used to obtain one of the refined structural models for the 2F state (PDB 8EZ5) were the same as those used to obtain the previously reported structural models PDB 6W1V and PDB 7RF8. This clarification has now been added as a footnote to Extended Data Table 1
Oscillator Models and Collective Motion: spatial patterns in the dynamics of engineered and biological networks
Coupled phase oscillator models are used to study the behavior of many natural and engineered systems that represent aggregations of individuals. Examples include the heart’s pacemaker cells, neurons in the brain, a group of fireflies, the central pattern generator for a lamprey eel, and an array of superconducting Josephson junctions. In each case, the activit
Contributions from popular education in health to structural competency training: An experience from Chile
Structural competency is used to train health professionals on how social, political, and economic dynamics create conditions that negatively impact a population’s health. In the Global South, this approach has historical roots in social movements, popular education, social medicine, and human rights. In 1982, during a time of extreme poverty, inequality, and violence under the Chilean military dictatorship, Educación Popular en Salud (EPES), developed a programme for training community health promoters to address common illnesses and analyse the underlying causes of poor health. In 2010, EPES began using the same model to train international and Chilean health professionals. The approach advanced four competencies. Evaluations show that training contributes to transforming health professionals’ mindsets and leads them to question their practices. However, educating practitioners does not change the underlying structures that generate poor health. This article examines the intersection between EPES’ competencies and the structural competency framework, highlighting two major contributions of EPES to structural competency: a methodology that narrows the gap between a theoretical analysis of social determinants of health and implementing action plans; and organic long-term links with social movements that strengthen collective action in poor neighbourhoods to advance social justice
Thermodynamic Separation of 1-Butene from 2-Butene in Metal–Organic Frameworks with Open Metal Sites
Most C4 hydrocarbons are obtained as
byproducts of ethylene production or oil refining, and complex and
energy-intensive separation schemes are required for their isolation.
Substantial industrial and academic effort has been expended to develop more cost-effective adsorbent- or membrane-based approaches to purify
commodity chemicals such as 1,3-butadiene, isobutene, and 1-butene, but the
very similar physical properties of these C4 hydrocarbons makes this
a challenging task. Here, we examine the adsorption behavior of 1-butene, cis-2-butene and trans-2-butene in the metal–organic frameworks M2(dobdc)
(M = Mn, Fe, Co, Ni; dobdc2− =
2,5-dioxidobenzene-1,4-dicarboxylate) and
M2(m-dobdc) (m-dobdc4− =
4,6-dioxido-1,3-benzenedicarboxylate), which all contain
a high density of coordinatively-unsaturated M2+ sites. We find that
both Co2(m-dobdc) and Ni2(m-dobdc) are able to separate 1-butene
from the 2-butene isomers, a critical industrial process that relies largely on
energetically demanding cryogenic distillation. The origin of 1-butene
selectivity is traced to the high charge density retained by the M2+
metal centers exposed within the M2(m-dobdc) structures, which results in a reversal of the cis-2-butene selectivity typically observed
at framework open metal sites. Selectivity for 1-butene adsorption under
multicomponent conditions is demonstrated for Ni2(m-dobdc) in both the gaseous and liquid phases via breakthrough and batch adsorption experiments
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