Relativistic Binaries in Globular Clusters

Galactic globular clusters are old, dense star systems typically containing 10\super{4}--10\super{7} stars. As an old population of stars, globular clusters contain many collapsed and degenerate objects. As a dense population of stars, globular clusters are the scene of many interesting close dynamical interactions between stars. These dynamical interactions can alter the evolution of individual stars and can produce tight binary systems containing one or two compact objects. In this review, we discuss theoretical models of globular cluster evolution and binary evolution, techniques for simulating this evolution that leads to relativistic binaries, and current and possible future observational evidence for this population. Our discussion of globular cluster evolution will focus on the processes that boost the production of hard binary systems and the subsequent interaction of these binaries that can alter the properties of both bodies and can lead to exotic objects. Direct {\it N}-body integrations and Fokker--Planck simulations of the evolution of globular clusters that incorporate tidal interactions and lead to predictions of relativistic binary populations are also discussed. We discuss the current observational evidence for cataclysmic variables, millisecond pulsars, and low-mass X-ray binaries as well as possible future detection of relativistic binaries with gravitational radiation.Comment: 88 pages, 13 figures. Submitted update of Living Reviews articl

Zika puzzle in Brazil: peculiar conditions of viral introduction and dissemination - A Review

This article discusses the peculiar conditions that favoured the unexpected introduction of Zika virus into the poorest northeastern region of Brazil in 2015, its speed of transmission to other Brazilian states, other Latin American countries and other regions, and the severity of related neurological disorders in newborns and adults. Contrasting with evidence that Zika had so far caused only mild cases in humans in the last six decades, the epidemiological scenario of this outbreak in Brazil indicates dramatic health effects: in 2015, an increase of 20-fold in notified cases of microcephaly and/or central nervous system (CNS) alterations suggestive of Zika congenital infection, followed by an exponential increase in 2016, with 2366 cumulative cases confirmed in the country by the end of December 2016. A significant increase in Guillain-Barré syndrome in adults has also been reported. Factors involved in viral dissemination, neural pathogenesis and routes of transmission in Brazil are examined, such as the role of social and environmental factors and the controversies involved in the hypothesis of antibody-dependent enhancement, to explain the incidence of congenital Zika syndrome in Brazil. Responses to the Zika outbreak and the development of new products are also discussed

Knowledge of Zika virus disease among reproductive-age women attending a general outpatient clinic in Northern Nigeria

Background: Nigeria is not insulated from the global threat of Zika virus disease (ZVD) because of international travel and the presence of Zika-virus-carrying mosquitoes in the country. A paucity of studies exists concerning knowledge of ZVD among atrisk populations. Thus, the necessity for assessment of knowledge of ZVD among reproductive-age women in general outpatient setting. Materials and methods: A cross-sectional study was conducted on 377 reproductive-age women attending a Nigerian tertiary hospital’s general outpatient clinic. Their knowledge of ZVD was assessed using a structured questionnaire. A chi-square test was used to assess the relationship between participants’ sociodemographics and ZVD knowledge. Results: The participants’ median age was 27.0 ± 7.19 years. Though 68.97% of participants were aware of ZVD, only 23.85% of those had good knowledge of ZVD. Their median knowledge score was 57.14%. Participants’ age (< 27 years) (p = 0.00399), tribe (Hausa) (p = 0.0174) and monogamous family type (p = 0.0108) were associated with good knowledge of ZVD. Only 5% knew that ZVD is transmitted through both mosquito bites and a sexual route. Some 80% were unaware that everybody was at risk of ZVD but 80.77% knew it could cause microcephaly. Insecticide-treated nets (80.77%), environmental sanitation (78.08%) and indoor insecticide spraying (58.85%) were preventive measures reported by most participants; a minority reported mosquito repellents (28.46%), wearing of protective clothing (36.15%), and traditional medicines (20.00%) as preventive measures. They lacked knowledge of prevention of sexual transmission. Conclusion: Participants’ knowledge of ZVD was inadequate despite the high awareness rate. Stakeholders may need to address existing knowledge gaps through effective public enlightenment. (Full text of the research articles are available online at www.medpharm.tandfonline.com/ojfp) S Afr Fam Pract 2017; DOI: 10.1080/20786190.2017.131348