RESUMEN

Objectives: In the face of escalating global aridification, this study examines the complex relationship between climate variability, air pollution, natural disasters, and the prevalence of cardiovascular disease (CVD) and diabetes mellitus (DM) in arid regions. Methods: The study conducted a scoping review of multiple databases using JBI guidelines and included 74 studies. Results: The results show that acute myocardial infarction (n = 20) and stroke (n = 13) are the primary CVDs affected by these factors, particularly affecting older adults (n = 34) and persons with hypertension (n = 3). Elevated air temperature and heat waves emerge as critical risk factors for CVD, exacerbating various cardiovascular mechanisms. Atmospheric pollutants and natural disasters increase this risk. Indirect effects of disasters amplify risk factors such as socioeconomic vulnerability (n = 4), inadequate medical care (n = 3), stress (n = 3), and poor diet (n = 2), increasing CVD and DM risk. Conclusion: The study underscores the need for nations to adhere to the Paris Agreement, advocating for reduced air pollutants, resilient environments, and collaborative, multidisciplinary research to develop targeted health interventions to mitigate the adverse effects of climate, pollution, and natural disasters.

RESUMEN

Flexible pressure sensors possess vast potential for various applications such as new energy batteries, aerospace engines, and rescue robots owing to their exceptional flexibility and adaptability. However, the existing sensors face significant challenges in maintaining long-term reliability and environmental resilience when operating in harsh environments with variable temperatures and high pressures (∼MPa), mainly due to possible mechanical mismatch and structural instability. Here, we propose a composite scheme for a flexible piezoresistive pressure sensor to improve its robustness by utilizing material design of near-zero temperature coefficient of resistance (TCR), radial gradient pressure-dividing microstructure, and flexible interface bonding process. The sensing layer comprising multiwalled carbon nanotubes (MWCNTs), graphite (GP), and thermoplastic polyurethane (TPU) was optimized to achieve a near-zero temperature coefficient of resistance over a temperature range of 25-70 °C, while the radial gradient microstructure layout based on pressure division increases the range of pressure up to 2 MPa. Furthermore, a flexible interface bonding process introduces a self-soluble transition layer by direct-writing TPU bonding solution at the bonding interface, which enables the sensor to achieve signal fluctuations as low as 0.6% and a high interface strength of up to 1200 kPa. Moreover, it has been further validated for its capability of monitoring the physiological signals of athletes as well as the long-term reliable environmental resilience of the expansion pressure of the power cell. This work demonstrates that the proposed scheme sheds new light on the design of robust pressure sensors for harsh environments.

RESUMEN

The growing consumption of plastic materials has increased hazardous threats to all environmental media, since current plastic waste management methods release microplastics and toxic chemicals. As such, massive generation of plastic derived pollutants leads to significant public health and environmental problems. In this work, an environmentally sound method for valorization of plastic waste is suggested. In detail, pyrolysis of polycarbonate-containing plastic waste such as automotive headlight housing (AHH) was carried out using CO2 as a co-reactant. AHH was chosen as it discharges bisphenol A (BPA) and aromatic compounds. Under CO2 condition, emissions of BPA and its derivatives were suppressed by 14.5% due to gas phase reactions (GPRs) with CO2. Nevertheless, reaction kinetics for GPRs was not significant. To impart the GPRs, catalytic pyrolysis was done using Ni and Co-based catalysts. During catalytic pyrolysis, syngas production was more than tenfold up comparing to pyrolysis without catalyst. The expedited GPRs over catalysts resulted in the enhanced syngas formation. Total concentration of the toxic chemicals from CO2-assisted catalytic pyrolysis of AHH decreased by 86.1% and 66.7% over Ni and Co catalysts, comparing to those from N2 environment.

Asunto(s)

RESUMEN

Considering environmental resources as a context for sustainable development is of paramount importance. Iran has faced a variety of environmental problems over the past few decades due to population development, changing patterns of residence, and urban development. Resilience measures the adaptation to changes occurring after unwanted events. Therefore, this study aimed to evaluate environmental resilience (natural and human factors) among the Iranian provinces. Then, the environmental resilience index was categorized through a data mining method, and the required measures for each pattern were presented according to the obtained patterns. Based on the results, Semnan Province had the highest environmental resilience, whereas Tehran, Alborz, Hormozgan, Isfahan, Khorasan Razavi, Khuzestan, and Sistan and Baluchestan had the lowest environmental resilience index (ERI). In addition, the results of data mining indicate that the provinces have five distinct patterns. CO2 emissions and drinking water access indicators have the highest and lowest importance in the formation of patterns, respectively. Furthermore, the environmental resilience of Tehran Province was influenced more by both indicators of energy use and CO2 emissions. Therefore, improvements in energy efficiency, developing public transportation, using standard fuels, and modernizing old industries should be considered as ways to increase productivity. The results of resilience patterns significantly help planners and managers develop policies and programs to increase environmental resilience.

Asunto(s)

RESUMEN

BACKGROUND: Marine holobionts depend on microbial members for health and nutrient cycling. This is particularly evident in cnidarian-algae symbioses that facilitate energy and nutrient acquisition. However, this partnership is highly sensitive to environmental change-including eutrophication-that causes dysbiosis and contributes to global coral reef decline. Yet, some holobionts exhibit resistance to dysbiosis in eutrophic environments, including the obligate photosymbiotic scyphomedusa Cassiopea xamachana. METHODS: Our aim was to assess the mechanisms in C. xamachana that stabilize symbiotic relationships. We combined labelled bicarbonate (13C) and nitrate (15N) with metabarcoding approaches to evaluate nutrient cycling and microbial community composition in symbiotic and aposymbiotic medusae. RESULTS: C-fixation and cycling by algal Symbiodiniaceae was essential for C. xamachana as even at high heterotrophic feeding rates aposymbiotic medusae continuously lost weight. Heterotrophically acquired C and N were readily shared among host and algae. This was in sharp contrast to nitrate assimilation by Symbiodiniaceae, which appeared to be strongly restricted. Instead, the bacterial microbiome seemed to play a major role in the holobiont's DIN assimilation as uptake rates showed a significant positive relationship with phylogenetic diversity of medusa-associated bacteria. This is corroborated by inferred functional capacity that links the dominant bacterial taxa (~90 %) to nitrogen cycling. Observed bacterial community structure differed between apo- and symbiotic C. xamachana putatively highlighting enrichment of ammonium oxidizers and nitrite reducers and depletion of nitrogen-fixers in symbiotic medusae. CONCLUSION: Host, algal symbionts, and bacterial associates contribute to regulated nutrient assimilation and cycling in C. xamachana. We found that the bacterial microbiome of symbiotic medusae was seemingly structured to increase DIN removal and enforce algal N-limitation-a mechanism that would help to stabilize the host-algae relationship even under eutrophic conditions. Video abstract.

Asunto(s)

RESUMEN

A food system can be defined as the entire range of processes and resources involved from the production of food through its consumption, including disposal of waste. The objective of this perspective paper is to discuss some of the impacts of Covid-19 on the hegemonic Brazilian food system. Based on a description of the pre-pandemic scenario, the article discusses the hegemonic food system in Brazil and its known effects on quality of life and environment, as well as the consequences that led to the current condition of fragility, with a great risk of crises, such as the one we now face. Briefly, the article also reflects on possible transformative changes resulting from the sanitary crises. Finally, possible ways of leading to a fairer, truly regenerative, local based and inclusive food system, are discussed. It is evident that just promoting healthy food systems is not enough, it is necessary to divest in degenerative systems, structured to increase earnings and the balance trade.  These demands reconfiguring and redirecting public policies and investments related to land use, expanding spaces and giving priority to financial, political and social resources to nourish food systems that result in more systemic benefits.

Compreende-se um Sistema Alimentar como o conjunto de processos e recursos necessários desde a produção até o consumo e o descarte do alimento. O objetivo desse artigo de perspectiva é discutir alguns impactos da pandemia de Covid-19 sobre o Sistema Alimentar hegemônico no Brasil. A partir de uma descrição do cenário pré-pandemia, são expostos alguns desdobramentos conhecidos sobre a qualidade de vida e do ambiente, bem como as consequências que potencialmente levaram a esta condição de fragilidade que é fértil para o desencadeamento de crises como a atual. Na sequência, o artigo traz uma reflexão sobre as repercussões possíveis em função da crise sanitária. Finalmente, trata das possibilidades de evoluir para um Sistema Alimentar mais justo, localizado, inclusivo e regenerativo. Destaca-se que não basta fomentar Sistemas Alimentares saudáveis, é necessário desinvestir em sistemas degenerativos, focados em beneficiar a arrecadação ou a balança comercial. Isso implica reconfigurar e redirecionar uma parte maior das políticas e recursos públicos relacionados com o uso da terra, liberando espaço e recursos financeiros, políticos e sociais para nutrir Sistemas Alimentares que resultem benefícios mais sistêmicos.

RESUMEN

Introdução. Sistemas alimentares resilientes são estratégicos para a soberania de uma nação, especialmente em crises sanitárias. Objetivo. Refletir sobre alguns aspectos do sistema alimentar hegemônico no Brasil frente à pandemia de Covid-19. Desenvolvimento. A partir de uma descrição do cenário pré-pandemia, são expostos alguns desdobramentos conhecidos sobre a qualidade de vida e do ambiente, bem como as consequências que potencialmente levaram a tal condição de fragilidade dos sistemas alimentares, que é fértil para o desencadeamento de crises como a atual. Finalmente, o artigo trata das possibilidades de transição para um sistema alimentar mais justo, localizado, inclusivo e regenerativo. Considerações finais. Não basta fomentar sistemas alimentares saudáveis; é necessário desinvestir de sistemas degenerativos, focados em beneficiar a arrecadação ou a balança comercial. Isso implica reconfigurar e redirecionar uma parte maior das políticas e recursos públicos relacionados com o uso da terra, liberando espaço e recursos financeiros, políticos e sociais para nutrir sistemas alimentares que resultem em benefícios mais sistêmicos.

Introduction. Resilient food systems are strategic to a nation's sovereignty, especially during a health crisis. Objective. To reflect on some aspects of the hegemonic food system in Brazil in the face of the COVID-19 pandemic. Development. On the basis of the description of the pre-pandemic scenario, we analyze and discuss aspects of quality of life and the environment that potentially determine the fragility of food systems and favor the emergence of a crisis such as the current one. Finally, the article deals with the possibilities of transition to a more just, inclusive, and regenerative food system. Final considerations. Fostering healthy food systems is not enough; it is necessary to disinvest from degenerative systems focused on benefiting private enrichment or the balance of trade. Such a change necessitates the reconfiguration and redirection of public policies and investments related to land use, liberating land and financial, political, and social resources to nourish food systems that result in more systemic benefits.

Asunto(s)