Calmodulin-like proteins localized to the conoid regulate motility and cell invasion by Toxoplasma gondii

Toxoplasma gondii contains an expanded number of calmodulin (CaM)-like proteins whose functions are poorly understood. Using a combination of CRISPR/Cas9-mediated gene editing and a plant-like auxin-induced degron (AID) system, we examined the roles of three apically localized CaMs. CaM1 and CaM2 were individually dispensable, but loss of both resulted in a synthetic lethal phenotype. CaM3 was refractory to deletion, suggesting it is essential. Consistent with this prediction auxin-induced degradation of CaM3 blocked growth. Phenotypic analysis revealed that all three CaMs contribute to parasite motility, invasion, and egress from host cells, and that they act downstream of microneme and rhoptry secretion. Super-resolution microscopy localized all three CaMs to the conoid where they overlap with myosin H (MyoH), a motor protein that is required for invasion. Biotinylation using BirA fusions with the CaMs labeled a number of apical proteins including MyoH and its light chain MLC7, suggesting they may interact. Consistent with this hypothesis, disruption of MyoH led to degradation of CaM3, or redistribution of CaM1 and CaM2. Collectively, our findings suggest these CaMs may interact with MyoH to control motility and cell invasion

The Evolution of Compact Binary Star Systems

We review the formation and evolution of compact binary stars consisting of white dwarfs (WDs), neutron stars (NSs), and black holes (BHs). Binary NSs and BHs are thought to be the primary astrophysical sources of gravitational waves (GWs) within the frequency band of ground-based detectors, while compact binaries of WDs are important sources of GWs at lower frequencies to be covered by space interferometers (LISA). Major uncertainties in the current understanding of properties of NSs and BHs most relevant to the GW studies are discussed, including the treatment of the natal kicks which compact stellar remnants acquire during the core collapse of massive stars and the common envelope phase of binary evolution. We discuss the coalescence rates of binary NSs and BHs and prospects for their detections, the formation and evolution of binary WDs and their observational manifestations. Special attention is given to AM CVn-stars -- compact binaries in which the Roche lobe is filled by another WD or a low-mass partially degenerate helium-star, as these stars are thought to be the best LISA verification binary GW sources.Comment: 105 pages, 18 figure

Support for smoke-free policy, and awareness of tobacco health effects and use of smoking cessation therapy in a developing country

BACKGROUND: Preventing an epidemic increase in smoking prevalence is a major challenge for developing countries. Ghana, has maintained a low smoking prevalence despite the presence of cigarette manufacturing for many decades. Some of this success may have been contributed by cultural factors and attitudes. We have studied public awareness of health risks, attitudes to smoke-free policy, tobacco advertising/promotion and other factors in a Ghanaian population sample. METHODS: We used two-stage cluster randomized sampling to study household members aged 14 and over in a representative household sample in the Ashanti Region of Ghana. RESULTS: 6258 people, 88% of those eligible, took part in the study. Knowledge of health risks of smoking and passive smoking was high; radio was the main source of such information. Most people work and/or spend time in places where smoking is permitted. There was very strong support (97%) for comprehensive smoke-free legislation, particularly among Christians and Muslims. Despite the advertising ban, a third of respondents (35%), particularly in urban areas, had noticed advertising of tobacco or tobacco products, on the radio (72%) and television (28%). Among smokers, 76% had attempted to quit in the last 6 months, with the main sources of advice being friends and spouses. Use of nicotine replacement therapy was very rare. Low levels of health awareness were seen in females compared with males (Adjusted Odds Ratio (AOR); 0.51, 95% CI 0.39-0.69, p < 0.001). High levels of health awareness was seen among Traditionalists compared with Christians AOR; 2.16 95% CI 0.79-5.94, p < 0.05) and the relatively well educated (AOR; 1.70 95% CI 1.12-2.58, p < 0.05) and those living in rural areas (AOR 1.46 95% CI 1.14-1.87, p = 0.004). CONCLUSION: Awareness of health risks and support for smoke-free policy are high in Ghana. Exposure to tobacco advertising or promotion is limited and most smokers have tried to quit. Whether these findings are cause or effect of current low smoking prevalence is uncertain

A Mammalian Conserved Element Derived from SINE Displays Enhancer Properties Recapitulating Satb2 Expression in Early-Born Callosal Projection Neurons

Short interspersed repetitive elements (SINEs) are highly repeated sequences that account for a significant proportion of many eukaryotic genomes and are usually considered “junk DNA”. However, we previously discovered that many AmnSINE1 loci are evolutionarily conserved across mammalian genomes, suggesting that they may have acquired significant functions involved in controlling mammalian-specific traits. Notably, we identified the AS021 SINE locus, located 390 kbp upstream of Satb2. Using transgenic mice, we showed that this SINE displays specific enhancer activity in the developing cerebral cortex. The transcription factor Satb2 is expressed by cortical neurons extending axons through the corpus callosum and is a determinant of callosal versus subcortical projection. Mouse mutants reveal a crucial function for Sabt2 in corpus callosum formation. In this study, we compared the enhancer activity of the AS021 locus with Satb2 expression during telencephalic development in the mouse. First, we showed that the AS021 enhancer is specifically activated in early-born Satb2+ neurons. Second, we demonstrated that the activity of the AS021 enhancer recapitulates the expression of Satb2 at later embryonic and postnatal stages in deep-layer but not superficial-layer neurons, suggesting the possibility that the expression of Satb2 in these two subpopulations of cortical neurons is under genetically distinct transcriptional control. Third, we showed that the AS021 enhancer is activated in neurons projecting through the corpus callosum, as described for Satb2+ neurons. Notably, AS021 drives specific expression in axons crossing through the ventral (TAG1−/NPY+) portion of the corpus callosum, confirming that it is active in a subpopulation of callosal neurons. These data suggest that exaptation of the AS021 SINE locus might be involved in enhancement of Satb2 expression, leading to the establishment of interhemispheric communication via the corpus callosum, a eutherian-specific brain structure

Ethical convergence, divergence or communitas? An examination of public relations and journalism codes of ethics

© 2015. In a fully functioning society, citizens need information about economic, social, and political issues. The news media perform this function. Citizens also need to engage in relationships with all sorts of economic, social, and political organizations. Public relations helps to create, maintain and change these relationships. Journalism and public relations are the foundation of a fully functioning society. This article explores the extent to which journalism and public relations professionals share foundational values. We compare the codes of ethics from 33 countries (66 public relations and journalist associations) looking for both convergence and divergence in ethical values. Our findings suggest that the two professions share core values such as professionalism, expertise and moral standards. The codes agree on the individual qualities that encourage professionals to act ethically. The codes diverge, however, on each profession’s view of its role in society. Journalists continue to emphasize duty to the public in their codes of ethics whereas many public relations codes focus on duty to the client or organization. Yet, this study found an evolving set of ethical codes in public relations that brings public relations and journalists closer together acknowledging their communitas roles in a fully functioning society

Reconsidering Power in Multistakeholder Relationship Management

© 2017, © The Author(s) 2017. Multistakeholder issue networks have been characterized as power-free, egalitarian forms of corporate–civil society engagement. Using a communication-centered conceptualization of power, our study finds that potential sources of power subtly manifest through communication and interaction patterns in multistakeholder issue networks. Our results indicate that organizations’ institutional status and resources are significant predictors of network power

Consenso brasileiro sobre políticas públicas do álcool Brazilian consensus on public policies on alcohol

Esse é um resumo de uma reunião na qual vários especialistas, representando diversas organizações médicas e universitárias brasileiras, criaram um consenso sobre as principais políticas que deveriam ser implementadas pelos diferentes níveis de governo no Brasil. Há mais de 30 anos a OMS vem buscando um consenso internacional sobre as ações com maior potencial de trazer benefícios sociais. Essa busca trouxe duas conclusões importantes: 1) A pesquisa estabelece, sem margem à dúvida, que existem medidas de eficácia comprovada para reduzir os custos e os danos relacionados ao uso de álcool, visando ao bem comum; 2) É possível desenvolver estratégias que influenciam tanto a quantidade de álcool consumida por uma comunidade quanto os comportamentos de consumo e os contextos de alto risco causadores dos problemas relacionados ao consumo de álcool. Os objetivos deste Consenso são: 1) Tornar as evidências científicas mais acessíveis para os que elaboram políticas públicas; 2) Facilitar a avaliação das diversas estratégias disponíveis segundo critérios de efetividade, suporte científico, custo e viabilidade de transposição cultural; 3) Familiarizar o profissional de saúde, e em especial os que trabalham em saúde mental, sobre as prioridades da política do álcool.<br>This is the summary of a meeting where a group of experts, representing several health organizations and academic departements from different parts of Brazil, created a consensus about the main alcohol policies which should be implemented by different levels of the brazilian government. The World Health Organization has been suggesting for 30 years the actions that should be implemented for the public good. Two important conclusions were reached: 1) The research establishes beyond doubt that public health measures of proven effectiveness are available to serve the public good by reducing the widespread costs and pain related to alcohol use; 2) To that end, it is appropriate to deploy responses that influence both the total amount of alcohol consumed by a population and the high-risk contexts and drinking behaviours that are so often associated with alcohol-related problems. To conceive of these intrinsically complementary approaches as contractory alternatives would be a mistake. The objectives of the consensus are: 1) To make the scientific evidences more available to the Brazilian policy makers; 2) To facilitate the evaluation of the available estrategies according their effectivity, scientific support, cost and cultural adaptability; 3) To make the brazilian health professionais familiar with the priorities of alcohol policies