The unstable coastline: navigating dispossession and belonging in Colombo

This article explores how residents of a small coastal fishing enclave in Colombo live with cumulative waves of dispossession brought on by exclusionary projects of urban development. Drawing on ethnographic fieldwork, I introduce the analytic of navigation to describe how people move, plan and live with both present and future threats of dispossession. Navigation offers a unique perspective on questions of agency and resistance in oppressive conditions. Rather than framing subjects as “resisting” projects of world-class city-making, this analysis shows that urban residents instead engage in complex and occasionally contradictory modes of living with uncertainty. I complicate existing understandings of the term “navigation” by describing how questions of nation and belonging are crucial to comprehending how people navigate. Ultimately, I suggest that expressions of belonging and obligation to an imagined community might not only be strategic, but instead reflect some of the broader social forces which structure possibilities for action

Rights, Knowledge, and Governance for Improved Health Equity in Urban Settings

All three of the interacting aspects of daily urban life (physical environment, social conditions, and the added pressure of climate change) that affect health inequities are nested within the concept of urban governance, which has the task of understanding and managing the interactions among these different factors so that all three can be improved together and coherently. Governance is defined as: “the process of collective decision making and processes by which decisions are implemented or not implemented”: it is concerned with the distribution, exercise, and consequences of power. Although there appears to be general agreement that the quality of governance is important for development, much less agreement appears to exist on what the concept really implies and how it should be used. Our review of the literature confirmed significant variation in meaning as well as in the practice of urban governance arrangements. The review found that the linkage between governance practices and health equity is under-researched and/or has been neglected. Reconnecting the fields of urban planning, social sciences, and public health are essential “not only for improving local governance, but also for understanding and addressing global political change” for enhanced urban health equity. Social mobilization, empowering governance, and improved knowledge for sustainable and equitable development in urban settings is urgently needed. A set of strategic research questions are suggested

Sodium Selenide Toxicity Is Mediated by O2-Dependent DNA Breaks

Hydrogen selenide is a recurrent metabolite of selenium compounds. However, few experiments studied the direct link between this toxic agent and cell death. To address this question, we first screened a systematic collection of Saccharomyces cerevisiae haploid knockout strains for sensitivity to sodium selenide, a donor for hydrogen selenide (H2Se/HSe−/Se2−). Among the genes whose deletion caused hypresensitivity, homologous recombination and DNA damage checkpoint genes were over-represented, suggesting that DNA double-strand breaks are a dominant cause of hydrogen selenide toxicity. Consistent with this hypothesis, treatment of S. cerevisiae cells with sodium selenide triggered G2/M checkpoint activation and induced in vivo chromosome fragmentation. In vitro, sodium selenide directly induced DNA phosphodiester-bond breaks via an O2-dependent reaction. The reaction was inhibited by mannitol, a hydroxyl radical quencher, but not by superoxide dismutase or catalase, strongly suggesting the involvement of hydroxyl radicals and ruling out participations of superoxide anions or hydrogen peroxide. The •OH signature could indeed be detected by electron spin resonance upon exposure of a solution of sodium selenide to O2. Finally we showed that, in vivo, toxicity strictly depended on the presence of O2. Therefore, by combining genome-wide and biochemical approaches, we demonstrated that, in yeast cells, hydrogen selenide induces toxic DNA breaks through an O2-dependent radical-based mechanism

Learning from Blackpool Promenade: Re-enchanting sterile streets

In this article, the authors contend that contemporary urban streets are over-regulated, preoccupied with surveillance, commercial requirements and rapid transit, aesthetically homogeneous and sensually sterile. As an exemplary site of contrast, the article focuses on the recently redesigned Blackpool Promenade. First, it argues that this redesign honours the resort’s popular traditions, its potent heritage and the importance of innovation. Second, it explores how the promenade fosters playful interactions, conviviality and lingering. Third, the article focuses on sensory attributes that enhance the experience of promenaders

Exploring urban verticality during the 2011 flood in Bangkok, Thailand

Geographers have a long-established research interest in the ways infrastructures shape urban flood vulnerability and how urbanites cope with urban flooding. In this paper, I contribute to this literature by exploring the three-dimensional city during an urban flooding situation. Within a case study (based on interviews and ethnographic observations), I attend to ad hoc coping practices of a diverse city population during the 2011 flood in Bangkok. I foreground the vertical direction of these strategies and the affordances of the urban built environment and urban infrastructures that enabled such coping. The paper thus stages a conversation between established literature on urban flood vulnerability and coping with an emerging interest in vertical urbanism literature. Through this conversation between the two literatures, research on urban verticality is probed to consider verticality as a crucial dimension of urbanism during times of flood disasters