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Chaperone-mediated thermotolerance in hyperthermophilic composting: Molecular-Level protein remodeling of microbial communities 在超嗜热堆肥中伴侣介导的耐热性:微生物群落的分子水平蛋白质重塑
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100630
Xu Li , Youzhao Wang , Feng Ma , Chaoyue Zhao , Yanping Zhang , Yaonan Zhu , Yang Zhang , Shujie Hou , Bingzhen Li , Fuxin Yang , Liying Hao , Tong Zhu
Hyperthermophilic composting (HC) represents a promising approach for converting organic solid waste into valuable resources by leveraging extreme temperatures to enhance microbial degradation and detoxification processes. In this high-temperature environment, microbial communities undergo dynamic succession, where thermophilic bacteria dominate and drive efficient organic matter transformation through adapted metabolic pathways and stress responses. These adaptations include the stabilization of cellular structures and enzymes, often mediated by heat shock proteins (HSPs) that prevent protein misfolding under thermal stress. However, the integrated mechanisms linking community-level functional shifts to molecular-level protein remodeling in thermophiles during HC remain poorly understood. Here we show a coordinated interaction of functional succession and molecular adaptations within thermophilic bacteria in HC, which collectively achieve heat resistance. This interaction encompasses enhanced metabolic and genetic modules, accounting for 97 % of the variance observed in thermophile abundance. Metagenomic analyses revealed upregulation of translation, transcription, amino acid metabolism, and cell wall biosynthesis, coupled with suppression of mobilome functions to maintain genomic stability, as confirmed by partial least squares path modeling and Boruta analyses. Molecular dynamics simulations of key enzymes from the thermophile Truepera further demonstrated intrinsic structural rigidity, reduced hydrophobic exposure, and hierarchical chaperone activity involving DNAJ, DNAK, and GroEL for protein repair. These findings enhance our comprehension of microbial thermotolerance and establish a foundation for optimizing composting efficiency and advancing heat-resistant microbial applications in biotechnology and waste management. Additionally, they offer insights into the evolution of thermophiles, protein engineering, and stress adaptation across various biological and industrial systems, thereby promoting the integration of environmental engineering and systems biology.
超嗜热堆肥(HC)是一种很有前途的方法,通过利用极端温度来增强微生物降解和解毒过程,将有机固体废物转化为有价值的资源。在这种高温环境中,微生物群落经历了动态演替,其中嗜热细菌占主导地位,并通过适应的代谢途径和应激反应驱动有效的有机质转化。这些适应性包括细胞结构和酶的稳定,通常由热休克蛋白(HSPs)介导,以防止蛋白质在热应激下错误折叠。然而,在HC过程中,将嗜热菌群落水平的功能转变与分子水平的蛋白质重塑联系起来的综合机制仍然知之甚少。在这里,我们展示了HC中嗜热细菌的功能演替和分子适应的协调相互作用,它们共同实现了耐热性。这种相互作用包括增强的代谢和遗传模块,占观察到的嗜热菌丰度方差的97%。宏基因组分析揭示了翻译、转录、氨基酸代谢和细胞壁生物合成的上调,以及对移动组功能的抑制,以维持基因组的稳定性,这一点得到了偏最小二乘路径模型和Boruta分析的证实。来自嗜热菌Truepera的关键酶的分子动力学模拟进一步证明了内在的结构刚性,减少了疏水暴露,以及涉及DNAJ, DNAK和GroEL的分层伴侣活性,用于蛋白质修复。这些发现增强了我们对微生物耐热性的理解,为优化堆肥效率和推进耐热微生物在生物技术和废物管理中的应用奠定了基础。此外,他们还提供了对各种生物和工业系统中嗜热菌,蛋白质工程和压力适应的进化的见解,从而促进了环境工程和系统生物学的整合。
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引用次数: 0
A hierarchical transformer and graph neural network model for high-accuracy watershed nitrate prediction 一种用于流域硝酸盐高精度预测的分层变压器和图神经网络模型
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100632
Jun Sun , Xuesong Gao , Zhiyong Deng , Yudong Zhao , Qi Wang , Xiyi Zhao , Xu Liu
Non-point source pollution from agricultural activities poses a significant threat to water quality by introducing excess nutrients like nitrogen into aquatic ecosystems, leading to issues such as eutrophication and groundwater contamination. In agricultural watersheds, nitrate transport involves intricate physical, chemical, and biological processes influenced by meteorological conditions, hydrological features, and spatial topologies, making accurate short-term predictions challenging. Traditional data-driven deep learning models often fail to incorporate physical constraints and complex spatiotemporal dynamics, limiting their interpretability and predictive accuracy. Here we show a hierarchical transformer and graph neural network model that accurately predicts watershed nitrate concentrations by integrating multi-source data and simulating pollutant migration. The model captures nonlinear multivariate temporal patterns through hierarchical transformers, fuses global meteorological and local hydrological features via neural networks, and models runoff topologies with physically constrained graph neural networks. For predicting the concentration changes of pollutants discharged from watersheds, it outperforms baselines like multi-layer perceptrons, recurrent neural networks, and long short-term memory networks, with state-of-the-art performance in root mean square error, mean absolute error, and R2. Ablation studies confirm the essential roles of multi-source data integration and watershed topological modeling in enhancing performance. This method of directly modeling physical processes by leveraging the characteristics of different neural network architectures opens up a new path for addressing the interpretability problem in neural earth system modeling, apart from the process-guided deep learning and differentiable modelling methods.
农业活动产生的非点源污染通过向水生生态系统引入过量的氮等营养物质,导致富营养化和地下水污染等问题,对水质构成重大威胁。在农业流域,硝酸盐的运输涉及复杂的物理、化学和生物过程,受气象条件、水文特征和空间拓扑的影响,这使得准确的短期预测具有挑战性。传统的数据驱动深度学习模型往往无法纳入物理约束和复杂的时空动态,从而限制了其可解释性和预测准确性。在这里,我们展示了一个分层变压器和图形神经网络模型,该模型通过集成多源数据和模拟污染物迁移来准确预测流域硝酸盐浓度。该模型通过分层变换捕获非线性多元时间模式,通过神经网络融合全球气象和当地水文特征,并使用物理约束图神经网络模拟径流拓扑。对于预测流域排放污染物的浓度变化,它优于多层感知器、循环神经网络和长短期记忆网络等基线,在均方根误差、平均绝对误差和R2方面具有最先进的性能。消融研究证实了多源数据集成和流域拓扑建模在提高性能方面的重要作用。这种利用不同神经网络架构的特点直接建模物理过程的方法,为解决神经地球系统建模中的可解释性问题开辟了一条新的途径,除了过程导向的深度学习和可微建模方法。
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引用次数: 0
Microbial protein-derived bioplastics from renewable substrates: pathways, challenges, and applications in a circular economy 可再生基质微生物蛋白衍生的生物塑料:途径、挑战和在循环经济中的应用
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100635
Myrsini Sakarika , Joost Brancart , Shreyash Anil Gujar , Steven De Meester , Luis Diaz Allegue , Leen Bastiaens , Peter Ragaert , Siegfried E. Vlaeminck , Heleen De Wever , Korneel Rabaey
Microbial protein (MP)—the protein-rich biomass derived from recovered or virgin resources—is attracting interest as a source of food and feed. However, its potential as a feedstock for protein-based bioplastics remains underexplored. Proteins offer desirable properties, including superior oxygen-barrier capabilities and complete biodegradability, making them ideal for applications from food packaging to agricultural mulches. Currently, most protein-based bioplastics derive from crops such as wheat, restricting applications and competing with food production. MP can overcome these limitations by supplying diverse proteins from various inputs, including CO2, biomass, and liquid side-streams. In this review, we evaluate bioprocessing pathways for producing MP from renewable and waste-derived substrates from an interdisciplinary viewpoint. We also examine the technical, regulatory, market, and environmental factors to address, delineating the pathway from substrate to MP-based plastics and highlighting key challenges throughout the production chain. Novel strategies—such as efficient co-recovery of proteins with other cellular products like polyhydroxyalkanoates or direct use of microbial biomass without extraction—are essential to maximize environmental and economic sustainability. Carefully chosen processing methods for recovered proteins, including wet and dry blending or extrusion with other biopolymers, can yield diverse products. Concurrently, policy and market developments are vital for adopting MP-based bioplastics. Addressing these challenges will enable MP-based bioplastics to propel the shift toward a circular economy, diminishing dependence on fossil-derived plastics and alleviating plastic pollution.
微生物蛋白(MP)是一种从回收或原始资源中提取的富含蛋白质的生物质,作为一种食物和饲料来源正引起人们的兴趣。然而,它作为蛋白质基生物塑料原料的潜力仍未得到充分开发。蛋白质具有理想的特性,包括卓越的阻氧能力和完全的生物降解性,使其成为从食品包装到农业覆盖物应用的理想选择。目前,大多数基于蛋白质的生物塑料来自小麦等作物,这限制了应用并与粮食生产竞争。MP可以通过从不同的输入(包括二氧化碳、生物质和液体侧流)中提供不同的蛋白质来克服这些限制。在这篇综述中,我们从跨学科的角度评估了从可再生和废物来源的基质生产MP的生物加工途径。我们还研究了需要解决的技术、监管、市场和环境因素,描绘了从基材到mp基塑料的途径,并强调了整个生产链中的关键挑战。新的策略——如与其他细胞产物如聚羟基烷酸酯有效地共同回收蛋白质或直接利用微生物生物量而不进行提取——对于最大限度地提高环境和经济的可持续性至关重要。精心选择的加工方法回收的蛋白质,包括湿和干混合或挤压与其他生物聚合物,可以产生不同的产品。同时,政策和市场发展对于采用mp基生物塑料至关重要。解决这些挑战将使基于mp的生物塑料能够推动向循环经济的转变,减少对化石衍生塑料的依赖并减轻塑料污染。
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引用次数: 0
Beyond animal testing: An integrated framework for modern chemical hazard identification and risk assessment 超越动物试验:现代化学危害识别和风险评估的综合框架
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100638
Tuantuan Fan , Zhenfei Yan , Chenglian Feng , Fengchang Wu
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引用次数: 0
AI and AI-powered digital twins for smart, green, and zero-energy buildings: A systematic review of leading-edge solutions for advancing environmental sustainability goals 智能、绿色和零能耗建筑的人工智能和人工智能驱动的数字孪生:推进环境可持续性目标的前沿解决方案的系统回顾
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100628
Simon Elias Bibri, Jeffrey Huang
<div><div>Buildings are among the largest contributors to global energy consumption and carbon emissions, making their transformation essential for advancing environmental sustainability goals. Innovative technologies such as artificial intelligence (AI) and digital twins (DTs) offer powerful tools for optimizing performance in smart, green, and zero-energy buildings. However, existing research remains fragmented—AI and AI-driven DT applications are often confined to isolated functions or specific building types—resulting in a limited, non-cohesive understanding of their collective potential in the built environment. This fragmentation, in turn, has hindered the development of integrated strategies that link building-level efficiencies with the broader environmental objectives of smart cities. To address these interrelated gaps, this study conducts a comprehensive systematic review of leading-edge AI and AI-powered DT solutions applied across smart, green, and zero-energy buildings. It aims to provide a holistic understanding of how these solutions enhance environmental performance through the analysis of key building-related indicators. By synthesizing, comparing, and evaluating recent research, it examines how AI and AI-powered DT technologies facilitate integrated, system-level strategies that promote environmentally sustainable smart practices across the built environment. The study reveals that AI enhances smart buildings by enabling dynamic energy optimization, occupant-centered environmental control, improved thermal comfort, renewable energy integration, and predictive system management. In green buildings, <span>AI</span> contributes to greater resource efficiency, minimizes construction and operational waste, promotes the use of sustainable materials, strengthens cost estimation and risk assessment processes, and supports adaptive design strategies. For zero-energy buildings, <span>AI</span> facilitates multi-objective optimization, advances explainable and transparent AI-driven control systems, supports performance benchmarking against net and nearly zero-energy standards, and enables renewable energy integration tailored to diverse climatic and regulatory contexts. Furthermore, AI-powered DTs enable real-time environmental monitoring, predictive analytics, anomaly detection, and adaptive operational strategies, thereby enhancing building performance, energy optimization, and resilience. At broader spatial scales, these technologies foster interconnected urban ecosystems, advancing environmental sustainability, sustainable development, and smart city initiatives. Building on these insights, this study introduces a novel integrated framework that positions AI and AI-driven DTs as systemic enablers of environmentally sustainable smart built and urban environments, emphasizing their cross-scale convergence in promoting carbon neutrality, circular economy principles, climate resilience, and regenerative urban strategies. The findings offer
建筑是全球能源消耗和碳排放的最大贡献者之一,因此其转型对于推进环境可持续性目标至关重要。人工智能(AI)和数字孪生(dt)等创新技术为优化智能、绿色和零能耗建筑的性能提供了强大的工具。然而,现有的研究仍然是碎片化的——人工智能和人工智能驱动的DT应用通常局限于孤立的功能或特定的建筑类型——导致对它们在建筑环境中的集体潜力的有限的、不连贯的理解。这种碎片化反过来又阻碍了将建筑层面的效率与智慧城市更广泛的环境目标联系起来的综合战略的发展。为了解决这些相互关联的差距,本研究对智能、绿色和零能耗建筑中应用的前沿人工智能和人工智能驱动的DT解决方案进行了全面系统的回顾。它旨在通过分析与建筑相关的关键指标,全面了解这些解决方案如何提高环境绩效。通过综合、比较和评估最近的研究,它研究了人工智能和人工智能驱动的DT技术如何促进集成的系统级战略,从而促进整个建筑环境中环境可持续的智能实践。研究表明,人工智能通过实现动态能源优化、以乘员为中心的环境控制、改善的热舒适性、可再生能源集成和预测性系统管理来增强智能建筑。在绿色建筑中,人工智能有助于提高资源效率,最大限度地减少建筑和运营浪费,促进可持续材料的使用,加强成本估算和风险评估过程,并支持适应性设计策略。对于零能耗建筑,人工智能促进了多目标优化,推进了可解释和透明的人工智能驱动控制系统,支持针对净和近零能耗标准的性能基准测试,并实现了针对不同气候和监管环境的可再生能源整合。此外,人工智能驱动的dt可以实现实时环境监测、预测分析、异常检测和自适应运营策略,从而提高建筑性能、能源优化和弹性。在更广泛的空间尺度上,这些技术促进了相互关联的城市生态系统,促进了环境可持续性、可持续发展和智慧城市倡议。在这些见解的基础上,本研究引入了一个新的集成框架,将人工智能和人工智能驱动的DTs定位为环境可持续智能建筑和城市环境的系统推动者,强调它们在促进碳中和、循环经济原则、气候适应能力和再生城市战略方面的跨尺度融合。研究结果为推进研究议程提供了可行途径,为建筑和城市系统设计提供了实用策略,并为致力于打造更智能、更可持续、更有弹性的城市未来的决策者提供了基于证据的建议。这项工作确立了人工智能和人工智能驱动的dt作为实现下一代资源节能型、碳中和型和生态一体化城市生态系统的变革性催化剂。
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引用次数: 0
The 2024 report of the synergetic roadmap on carbon neutrality and clean air for China: Pollution and carbon reduction promote green economic development 《中国碳中和与清洁空气协同路线图2024》报告:污染减排促进绿色经济发展
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100636
Zhicong Yin , Yu Lei , Xi Lu , Qiang Zhang , Jicheng Gong , Xin Liu , Wei Li , Cilan Cai , Qimin Chai , Renjie Chen , Wenhui Chen , Hancheng Dai , Zhanfeng Dong , Jingli Fan , Guannan Geng , Cunrui Huang , Jianlin Hu , Shan Hu , Moyu Li , Tiantian Li , Kebin He
Addressing climate change and air pollution exhibits strong synergy, and the Chinese government is actively promoting the integrated management of these two issues. Since 2019, the China Clean Air Policy Partnership has released annual reports on China's progress in climate and air pollution governance. These reports track and analyze the challenges and propose solutions for China's pursuit of carbon neutrality and clean air by developing and monitoring key indicators across five areas. This report is the fourth annual report. Building on previous research, it further refines the collaborative governance monitoring indicator system, including the addition of climate change and extreme weather, atmospheric greenhouse gases, and enhanced efficiency of pollution removal technologies. The report includes the following components: (1) an analysis of the interactions between air pollution and climate change; (2) a discussion of governance systems and practices, with an emphasis on policy implementation and local experiences; (3) coverage of structural changes and emission reduction technologies, including energy and industrial transitions, transportation, low-carbon buildings, carbon capture and storage, and power systems; (4) an overview of atmospheric dynamics and emission pathways, examining emission drivers and offering insights for future coordinated governance; and (5) an evaluation of the health impacts and benefits of joint actions. These efforts underscore China's commitment to integrated control, resulting in slowed carbon emission growth, improved air quality, and enhanced health benefits.
应对气候变化和大气污染具有很强的协同效应,中国政府正在积极推动两者的综合治理。自2019年以来,中国清洁空气政策伙伴关系每年都会发布关于中国气候和空气污染治理进展的报告。这些报告通过制定和监测五个领域的关键指标,跟踪和分析中国在追求碳中和和清洁空气方面面临的挑战,并提出解决方案。本报告是第四份年度报告。在前人研究的基础上,进一步完善了协同治理监测指标体系,包括增加了气候变化与极端天气、大气温室气体、提高了污染清除技术的效率等。报告包括以下内容:(1)分析空气污染与气候变化之间的相互作用;(2)讨论治理体系和实践,重点是政策实施和地方经验;(3)结构变化和减排技术的覆盖范围,包括能源和产业转型、交通运输、低碳建筑、碳捕集与封存以及电力系统;(4)概述大气动力学和排放途径,研究排放驱动因素,为未来的协调治理提供见解;(5)评价联合行动对健康的影响和效益。这些努力突显了中国对综合治理的承诺,从而减缓了碳排放增长,改善了空气质量,增强了健康效益。
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引用次数: 0
Tracking reservoir warming in a changing climate: A 31-year study from Czechia 在气候变化中跟踪水库变暖:捷克的一项31年研究
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100631
Petr Znachor , Dušan Kosour , Luděk Rederer , Václav Koza , Vojtěch Kolář , Jiří Nedoma
Freshwater reservoirs are critical for water management but face increasing impacts from climate change, which alters their thermal regimes and affects ecosystem functions globally. In temperate regions, surface water temperatures have risen at rates often surpassing those of air temperature, driven by atmospheric warming, hydrological processes, and reservoir morphometry. However, long-term studies on reservoir-specific thermal responses, particularly short-term variability, remain scarce. An important question is how environmental drivers influence both long-term warming trends and daily thermal fluctuations in managed water bodies. Here we show that over 31 years (1991–2021), surface water temperatures in 35 Czech reservoirs increased by an average of 0.59 °C per decade, with air temperature, altitude, and retention time as primary predictors of mean temperatures. A novel corrected metric for day-to-day variability (DTDV) revealed that inflow rate, depth, and retention time strongly influence short-term fluctuations, and DTDV trends positively correlated with warming rates, indicating linked drivers of thermal reorganization. Seasonal patterns showed strongest warming in April, with an anomaly of minimal change in May, likely tied to regional climatic shifts. These findings elucidate climate-driven thermal dynamics in reservoirs, highlighting the interaction of climatic and local factors. By combining statistical modeling with process-based indicators, this study informs adaptive strategies to mitigate impacts on water quality, stratification, and biodiversity under changing climates.
淡水水库对水资源管理至关重要,但气候变化的影响越来越大,气候变化改变了淡水水库的热状态,影响了全球生态系统的功能。在温带地区,受大气变暖、水文过程和水库形态测量的影响,地表水温度的上升速度往往超过气温的上升速度。然而,关于储层特定热响应的长期研究,特别是短期变化,仍然很少。一个重要的问题是环境驱动因素如何影响管理水体的长期变暖趋势和每日热波动。研究表明,在31年(1991-2021年)期间,捷克35个水库的地表水温度平均每十年增加0.59°C,气温、海拔和滞留时间是平均温度的主要预测因子。一种新的修正日变率(DTDV)指标显示,入流速率、深度和滞留时间对短期波动有强烈影响,DTDV趋势与升温速率正相关,表明热重组的相关驱动因素。季节模式显示,4月份的变暖最强烈,5月份的异常变化最小,这可能与区域气候变化有关。这些发现阐明了气候驱动的储层热动力学,强调了气候和当地因素的相互作用。通过将统计模型与基于过程的指标相结合,本研究提供了适应策略,以减轻气候变化对水质、分层和生物多样性的影响。
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引用次数: 0
Utilizing network optimization to mitigate rising greenspace exposure inequalities in Chinese cities from 2000 to 2050 利用网络优化缓解2000 - 2050年中国城市绿地暴露不平等加剧
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100633
Rundong Feng , Bin Chen , Shenghe Liu , Fuyuan Wang , Kaiyong Wang , Bojie Fu
Urban greenspaces enhance human well-being and promote sustainable development in rapidly urbanizing regions by delivering vital ecosystem services, including cooling, air purification, and recreation. In China, where cities accommodate a large share of the population amid persistent environmental pressures, disparities in greenspace exposure pose a major obstacle to equitable access; these disparities arise from geographic, climatic, socioeconomic, and landscape factors. Although awareness of such inequalities is growing, their long-term trajectories, demographic and city-scale patterns, and viable spatial optimization approaches remain largely unexplored. Here we show that greenspace exposure inequality across 246 Chinese cities increased by 25 % from 2000 to 2020 and is projected to rise further by 12.2–15.7 % by 2050 under middle-of-the-road and fossil-fueled development scenarios, disproportionately affecting older, less-educated women and megacity residents. Geodetector and random forest analyses reveal that this rise results from interactions among greenspace coverage, population density, and patch connectivity, which explain 83.9 % of the inequality. A network-based optimization approach that improves patch connectivity—without expanding total greenspace—can reduce disparities by 10.3–20.8 %, with greater efficacy in high-inequality cities and among vulnerable populations. Our results highlight how precise landscape interventions can advance social equity in greenspace access, supporting Sustainable Development Goal 11 for inclusive, resilient urban environments.
城市绿地通过提供重要的生态系统服务,包括降温、空气净化和娱乐,提高了人类福祉,促进了快速城市化地区的可持续发展。在中国,在持续的环境压力下,城市容纳了很大一部分人口,绿地暴露的差异对公平获取构成了主要障碍;这些差异是由地理、气候、社会经济和景观因素造成的。尽管人们对这种不平等现象的认识日益增强,但其长期轨迹、人口和城市规模的模式以及可行的空间优化方法在很大程度上仍未得到探索。研究表明,从2000年到2020年,246个中国城市的绿地暴露不平等增加了25%,预计到2050年,在中等道路和化石燃料发展情景下,绿地暴露不平等将进一步增加12.2 - 15.7%,对老年人、受教育程度较低的妇女和特大城市居民的影响尤为严重。地理探测器和随机森林分析表明,这种上升是绿地覆盖率、人口密度和斑块连通性之间的相互作用的结果,它们解释了83.9%的不平等。一种基于网络的优化方法,在不扩大总绿地面积的情况下,提高斑块连通性,可以将差距缩小10.3 - 20.8%,在不平等程度高的城市和弱势群体中效果更佳。我们的研究结果强调了精确的景观干预如何促进绿色空间准入方面的社会公平,支持可持续发展目标11中关于包容性、弹性城市环境的目标。
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引用次数: 0
GIEHP: A global, AI-powered platform for near real-time ecological intelligence GIEHP:全球近实时生态智能人工智能平台
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100634
Dong Xu, Yi-Chen Wang
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引用次数: 0
Hydrogen excess drives metabolic reprogramming and viral dynamics in syngas-converting microbiomes 氢过量驱动合成气转化微生物组的代谢重编程和病毒动力学
IF 14.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-11-01 DOI: 10.1016/j.ese.2025.100637
Gabriele Ghiotto, Luca Francescato, Maria Agustina Biancalani, Laura Treu, Stefano Campanaro
Microbial communities drive essential bioprocesses, including the conversion of synthesis gas into biomethane, a sustainable energy source that supports circular carbon economies. In anaerobic environments, specialized consortia of bacteria and archaea facilitate syngas methanation through syntrophic interactions, where hydrogenotrophic methanogens play a central role in reducing carbon dioxide and monoxide with hydrogen. However, imbalances in gas ratios, particularly excess hydrogen, can disrupt these interactions and impair overall efficiency. Yet, the molecular mechanisms underlying microbial responses to such imbalances remain poorly understood. Here we show that hydrogen excess triggers profound metabolic and viral remodeling in a thermophilic anaerobic microbiome, leading to reduced methane yields and ecological instability. This reprogramming involves transcriptional downregulation of methanogenesis genes in the dominant archaeon Methanothermobacter thermautotrophicus, coupled with upregulation of CRISPR-Cas and restriction-modification systems that correlate with diminished activity of an associated phage, indicating activated host defenses against viral threats. Concurrently, bacterial species such as those from Tepidanaerobacteraceae enhance carbon fixation via the Wood–Ljungdahl pathway, serving as electron sinks to mitigate redox imbalance. These adaptive responses highlight the microbiome's resilience mechanisms under stress, revealing viruses as both stressors and selective forces in syntrophic systems. Such insights advance our understanding of microbiome dynamics in bioconversion processes and guide the engineering of more stable microbial consortia for optimized syngas-to-methane conversion amid variable feedstocks.
微生物群落推动重要的生物过程,包括将合成气转化为生物甲烷,这是一种支持循环碳经济的可持续能源。在厌氧环境中,细菌和古细菌的特殊联合体通过共生相互作用促进合成气甲烷化,其中氢营养化产甲烷菌在用氢还原二氧化碳和一氧化碳方面发挥核心作用。然而,气体比例的不平衡,特别是过量的氢,会破坏这些相互作用,损害整体效率。然而,微生物对这种失衡反应的分子机制仍然知之甚少。在这里,我们发现氢过量会引发嗜热厌氧微生物群的深刻代谢和病毒重塑,导致甲烷产量减少和生态不稳定。这种重编程涉及优势古菌热自养产甲烷菌中产甲烷基因的转录下调,加上与相关噬菌体活性降低相关的CRISPR-Cas和限制性修饰系统的上调,表明激活了宿主对病毒威胁的防御。同时,来自Tepidanaerobacteraceae的细菌通过Wood-Ljungdahl途径增强碳固定,作为电子汇减轻氧化还原失衡。这些适应性反应突出了微生物组在压力下的恢复机制,揭示了病毒在共生系统中既是压力源又是选择力。这些见解促进了我们对生物转化过程中微生物组动力学的理解,并指导了在可变原料中优化合成气到甲烷转化的更稳定的微生物群落的工程设计。
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Environmental Science and Ecotechnology
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