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Physiological cost of antibiotic resistance: Insights from a ribosome variant in bacteria 抗生素耐药性的生理代价:细菌核糖体变异的启示
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-15 DOI: 10.1126/sciadv.adq5249
Eun Chae Moon, Tushar Modi, Dong-yeon D. Lee, Danis Yangaliev, Jordi Garcia-Ojalvo, S. Banu Ozkan, Gürol M. Süel
Antibiotic-resistant ribosome variants arise spontaneously in bacterial populations; however, their impact on the overall bacterial physiology remains unclear. We studied the naturally arising antibiotic-resistant L22* ribosome variant of Bacillus subtilis and identified a Mg2+-dependent physiological cost. Coculture competition experiments show that Mg2+ limitation hinders the growth of the L22* variant more than the wild type (WT), even under antibiotic pressure. This growth disadvantage of L22* cells is not due to lower ribosome abundance but rather due to reduced intracellular Mg2+ levels. Coarse-grained elastic-network modeling of ribosome conformational dynamics suggests that L22* ribosomes associate more tightly with Mg2+ when compared to WT. We combined the structural modeling and experimental measurements in a steady-state model to predict cellular adenosine 5′-triphosphate (ATP) levels, which also depend on Mg2+. Experiments confirmed a predicted ATP drop in L22* cells under Mg2+ limitation, while WT cells were less affected. Intracellular competition for a finite Mg2+ pool can thus suppress the establishment of an antibiotic-resistant ribosome variant.
细菌群体中会自发产生抗生素核糖体变体,但它们对细菌整体生理机能的影响尚不清楚。我们对枯草芽孢杆菌自然产生的抗生素核糖体变体 L22* 进行了研究,发现了一种依赖于 Mg 2+ 的生理代价。共培养竞争实验表明,即使在抗生素压力下,Mg 2+ 限制对 L22* 核糖体变体生长的阻碍也大于野生型(WT)。L22*细胞的这种生长劣势不是由于核糖体丰度较低,而是由于细胞内Mg 2+水平降低。核糖体构象动力学的粗粒度弹性网络建模表明,与 WT 相比,L22* 核糖体与 Mg 2+ 结合得更紧密。我们将结构建模和实验测量结果结合到一个稳态模型中,以预测细胞腺苷-5′-三磷酸(ATP)水平,该水平也取决于 Mg 2+。实验证实,在 Mg 2+ 限制条件下,L22* 细胞中的 ATP 会下降,而 WT 细胞受到的影响较小。因此,细胞内对有限 Mg 2+ 池的竞争可抑制抗生素核糖体变体的形成。
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引用次数: 0
H2S-Prdx4 axis mitigates Golgi stress to bolster tumor-reactive T cell immunotherapeutic response H 2 S-Prdx4 轴减轻高尔基体应激反应,增强肿瘤反应性 T 细胞免疫治疗反应
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-15 DOI: 10.1126/sciadv.adp1152
Nathaniel Oberholtzer, Paramita Chakraborty, Mohamed Faisal Kassir, James Dressman, Satyajit Das, Stephanie Mills, Susana Comte-Walters, Monika Gooz, Seungho Choi, Rasesh Y. Parikh, Zacharia Hedley, Silvia Vaena, Reid DeMass, Gina Scurti, Martin Romeo, Vamsi K. Gangaraju, Stefano Berto, Elizabeth Hill, Lauren E. Ball, Anand S. Mehta, Eduardo N. Maldonado, Michael I. Nishimura, Besim Ogretmen, Shikhar Mehrotra
The role of tumor microenvironment (TME)–associated inadequate protein modification and trafficking due to insufficiency in Golgi function, leading to Golgi stress, in the regulation of T cell function is largely unknown. Here, we show that disruption of Golgi architecture under TME stress, identified by the decreased expression of GM130, was reverted upon treatment with hydrogen sulfide (H2S) donor GYY4137 or overexpressing cystathionine β-synthase (CBS), an enzyme involved in the biosynthesis of endogenous H2S, which also promoted stemness, antioxidant capacity, and increased protein translation, mediated in part by endoplasmic reticulum–Golgi shuttling of Peroxiredoxin-4. In in vivo models of melanoma and lymphoma, antitumor T cells conditioned ex vivo with exogenous H2S or overexpressing CBS demonstrated superior tumor control upon adoptive transfer. Further, T cells with high Golgi content exhibited unique metabolic and glycation signatures with enhanced antitumor capacity. These data suggest that strategies to mitigate Golgi network stress or using Golgihi tumor-reactive T cells can improve tumor control upon adoptive transfer.
肿瘤微环境(TME)与高尔基体功能不足导致的蛋白质修饰和转运不足有关,从而导致高尔基体应激,而高尔基体应激在调控 T 细胞功能中的作用在很大程度上是未知的。在这里,我们发现,在硫化氢(H 2 S)供体 GYY4137 处理或过表达胱硫醚 β 合成酶(CBS)后,TME 应激下高尔基体结构的破坏(由 GM130 的表达减少确定)被逆转、这也促进了干性、抗氧化能力和蛋白质翻译的增加,部分是由内质网-高尔基体穿梭的过氧化还原酶-4介导的。在黑色素瘤和淋巴瘤的活体模型中,用外源 H 2 S 或过表达 CBS 的抗肿瘤 T 细胞在进行收养性转移时显示出卓越的肿瘤控制能力。此外,高尔基体含量高的 T 细胞表现出独特的代谢和糖化特征,具有更强的抗肿瘤能力。这些数据表明,减轻高尔基体网络压力或使用高尔基体高肿瘤反应性 T 细胞的策略可以提高肿瘤控制能力。
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引用次数: 0
Dynamical control of nanoscale electron density in atomically thin n-type semiconductors via nano-electric pulse generator 通过纳米电脉冲发生器动态控制原子薄 n 型半导体中的纳米级电子密度
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-15 DOI: 10.1126/sciadv.adr0492
Sujeong Kim, Hyeongwoo Lee, Seonhye Eom, Gangseon Ji, Soo Ho Choi, Huitae Joo, Jinhyuk Bae, Ki Kang Kim, Hyeong-Ryeol Park, Kyoung-Duck Park
Controlling electron density in two-dimensional semiconductors is crucial for both comprehensive understanding of fundamental material properties and their technological applications. However, conventional electrostatic doping methods exhibit limitations, particularly in addressing electric field–induced drift and subsequent diffusion of electrons, which restrict nanoscale doping. Here, we present a tip-induced nanospectroscopic electric pulse modulator to dynamically control nanoscale electron density, thereby facilitating precise measurement of nano-optoelectronic behaviors within a MoS2 monolayer. The tip-induced electric pulse enables nanoscale modulation of electron distribution as a function of electric pulse width. We simultaneously investigate spatially altering photoluminescence quantum yield at the nanoscale region. We model the extent of electron depletion region, confirming a minimum doping region with a radius of ∼265 nanometers for a 30-nanosecond pulse width. Our approach paves the way for engineering local electron density and in situ nano-optical characterization in two-dimensional materials, enabling an in-depth understanding of doping-dependent nano-optoelectronic phenomena.
控制二维半导体中的电子密度对于全面了解材料的基本特性及其技术应用至关重要。然而,传统的静电掺杂方法存在局限性,尤其是在解决电场诱导的电子漂移和随后的电子扩散方面,这限制了纳米尺度的掺杂。在这里,我们提出了一种尖端诱导纳米光谱电脉冲调制器,用于动态控制纳米级电子密度,从而促进 MoS 2 单层内纳米光电行为的精确测量。尖端诱导的电脉冲能以电脉冲宽度的函数对电子分布进行纳米级调制。同时,我们还研究了纳米尺度区域光致发光量子产率的空间变化。我们对电子耗尽区的范围进行了建模,确认了在 30 纳秒脉冲宽度下半径为 ∼ 265 纳米的最小掺杂区。我们的方法为二维材料中的局部电子密度工程和原位纳米光学表征铺平了道路,使人们能够深入了解依赖于掺杂的纳米光电现象。
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引用次数: 0
Robust generation of intrinsic C points with magneto-optical bound states in the continuum 利用连续体中的磁光束缚态稳健生成固有 C 点
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-15 DOI: 10.1126/sciadv.ads0157
Wenjing Lv, Haoye Qin, Zengping Su, Chengzhi Zhang, Jiongpeng Huang, Yuzhi Shi, Bo Li, Patrice Genevet, Qinghua Song
C points, circular polarization in momentum space, play crucial roles in chiral wave manipulations. However, conventional approaches of achieving intrinsic C points using photonic crystals with broken symmetries suffer from a low Q factor and high sensitivity to structural geometry, rendering them fragile and susceptible to perturbations and disorders. We report magneto-optical (MO) bound states in the continuum (BICs) with a symmetry-preserved planar photonic crystal. We achieve intrinsic C points at Γ point that are robust against variation in both structural geometry and external magnetic field. MO coupling between two modes induces Zeeman splitting, leading to MO BICs and quasi-BICs with circular eigenstates for high-Q chiral responses. Furthermore, switchable C point handedness and circular dichroism are enabled by reversing the magnetic field. These findings unveil BICs and quasi-BICs with circular eigenstates and on-demand control of C points, paving the way for advanced chiral wave manipulation with enhanced light-matter interaction.
C 点是动量空间中的圆偏振,在手性波操纵中发挥着至关重要的作用。然而,利用对称性被破坏的光子晶体实现本征 C 点的传统方法存在 Q 值系数低和对结构几何高度敏感的问题,这使得它们非常脆弱,容易受到扰动和紊乱的影响。我们利用对称性保留的平面光子晶体报告了连续体中的磁光(MO)束缚态(BICs)。我们在 Γ 点实现了本征 C 点,它对结构几何和外部磁场的变化都很稳定。两种模式之间的 MO 耦合会诱发泽曼分裂,从而产生 MO BIC 和准 BIC,并具有高 Q 手性响应的圆形特征态。此外,通过反转磁场还能实现可切换的 C 点手性和圆二色性。这些发现揭示了具有圆特征状态和按需控制 C 点的 BIC 和准 BIC,为增强光-物质相互作用的先进手性波操纵铺平了道路。
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引用次数: 0
Cell response to extracellular matrix viscous energy dissipation outweighs high-rigidity sensing 细胞对细胞外基质粘性能量耗散的反应超过了高刚性感应
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-15 DOI: 10.1126/sciadv.adf9758
Carla Huerta-López, Alejandro Clemente-Manteca, Diana Velázquez-Carreras, Francisco M. Espinosa, Juan G. Sanchez, Álvaro Martínez-del-Pozo, María García-García, Sara Martín-Colomo, Andrea Rodríguez-Blanco, Ricardo Esteban-González, Francisco M. Martín-Zamora, Luis I. Gutierrez-Rus, Ricardo Garcia, Pere Roca-Cusachs, Alberto Elosegui-Artola, Miguel A. del Pozo, Elías Herrero-Galán, Pablo Sáez, Gustavo R. Plaza, Jorge Alegre-Cebollada
The mechanics of the extracellular matrix (ECM) determine cell activity and fate through mechanoresponsive proteins including Yes-associated protein 1 (YAP). Rigidity and viscous relaxation have emerged as the main mechanical properties of the ECM steering cell behavior. However, how cells integrate coexisting ECM rigidity and viscosity cues remains poorly understood, particularly in the high-stiffness regime. Here, we have exploited engineered stiff viscoelastic protein hydrogels to show that, contrary to current models of cell-ECM interaction, substrate viscous energy dissipation attenuates mechanosensing even when cells are exposed to higher effective rigidity. This unexpected behavior is however readily captured by a pull-and-hold model of molecular clutch–based cell mechanosensing, which also recapitulates opposite cellular response at low rigidities. Consistent with predictions of the pull-and-hold model, we find that myosin inhibition can boost mechanosensing on cells cultured on dissipative matrices. Together, our work provides general mechanistic understanding on how cells respond to the viscoelastic properties of the ECM.
细胞外基质(ECM)的机械特性通过包括是相关蛋白 1(YAP)在内的机械反应蛋白决定细胞的活动和命运。刚性和粘性松弛已成为引导细胞行为的 ECM 的主要力学特性。然而,人们对细胞如何整合共存的 ECM 刚度和粘度线索仍然知之甚少,尤其是在高刚度条件下。在这里,我们利用工程化的刚性粘弹性蛋白质水凝胶证明,与当前的细胞-ECM 相互作用模型相反,即使细胞暴露在较高的有效刚性下,基质的粘性能量耗散也会减弱机械感应。然而,基于分子离合器的细胞机械传感的拉持模型很容易捕捉到这种意想不到的行为,该模型也再现了细胞在低刚度时的相反反应。与拉-持模型的预测一致,我们发现肌球蛋白抑制能增强在耗散基质上培养的细胞的机械感应。总之,我们的工作提供了关于细胞如何对 ECM 的粘弹性做出反应的一般机理认识。
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引用次数: 0
Decoding the interplay between m6A modification and stress granule stability by live-cell imaging 通过活细胞成像解码 m 6 A 修饰与应力颗粒稳定性之间的相互作用
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-15 DOI: 10.1126/sciadv.adp5689
Qianqian Li, Jian Liu, Liping Guo, Yi Zhang, Yanwei Chen, Huijuan Liu, Hongyu Cheng, Lin Deng, Juhui Qiu, Ke Zhang, Wee Siong Sho Goh, Yingxiao Wang, Qin Peng
N6-methyladenosine (m6A)–modified mRNAs and their cytoplasmic reader YTHDFs are colocalized with stress granules (SGs) under stress conditions, but the interplay between m6A modification and SG stability remains unclear. Here, we presented a spatiotemporal m6A imaging system (SMIS) that can monitor the m6A modification and the translation of mRNAs with high specificity and sensitivity in a single live cell. SMIS showed that m6A-modified reporter mRNAs dynamically enriched into SGs under arsenite stress and gradually partitioned into the cytosol as SG disassembled. SMIS revealed that knockdown of YTHDF2 contributed to SG disassembly, resulting in the fast redistribution of mRNAs from SGs and rapid recovery of stalled translation. The mechanism is that YTHDF2 can regulate SG stability through the interaction with G3BP1 in m6A-modified RNA-dependent manner. Our results suggest a mechanism for the interplay between m6A modification and SG through YTHDF2 regulation.
N 6 -甲基腺苷(m 6 A)修饰的mRNA及其胞质阅读器YTHDFs在应激条件下与应激颗粒(SG)共定位,但m 6 A修饰与SG稳定性之间的相互作用仍不清楚。在这里,我们展示了一种时空 m 6 A 成像系统(SMIS),它能在单个活细胞中以高特异性和高灵敏度监测 m 6 A 修饰和 mRNA 的翻译。SMIS显示,在亚砷酸盐胁迫下,m 6 A修饰的报告基因mRNA动态地富集到SG中,并随着SG的解体逐渐进入细胞质。SMIS发现,YTHDF2的敲除有助于SG的解体,导致mRNA从SG中快速重新分布,并使停滞的翻译迅速恢复。其机制是YTHDF2通过与G3BP1相互作用,以m 6 A修饰RNA依赖的方式调节SG的稳定性。我们的研究结果表明,m 6 A修饰与SG之间的相互作用机制是通过YTHDF2调控的。
{"title":"Decoding the interplay between m6A modification and stress granule stability by live-cell imaging","authors":"Qianqian Li,&nbsp;Jian Liu,&nbsp;Liping Guo,&nbsp;Yi Zhang,&nbsp;Yanwei Chen,&nbsp;Huijuan Liu,&nbsp;Hongyu Cheng,&nbsp;Lin Deng,&nbsp;Juhui Qiu,&nbsp;Ke Zhang,&nbsp;Wee Siong Sho Goh,&nbsp;Yingxiao Wang,&nbsp;Qin Peng","doi":"10.1126/sciadv.adp5689","DOIUrl":"10.1126/sciadv.adp5689","url":null,"abstract":"<div ><i>N</i><sup>6</sup>-methyladenosine (m<sup>6</sup>A)–modified mRNAs and their cytoplasmic reader YTHDFs are colocalized with stress granules (SGs) under stress conditions, but the interplay between m<sup>6</sup>A modification and SG stability remains unclear. Here, we presented a spatiotemporal m<sup>6</sup>A imaging system (SMIS) that can monitor the m<sup>6</sup>A modification and the translation of mRNAs with high specificity and sensitivity in a single live cell. SMIS showed that m<sup>6</sup>A-modified reporter mRNAs dynamically enriched into SGs under arsenite stress and gradually partitioned into the cytosol as SG disassembled. SMIS revealed that knockdown of YTHDF2 contributed to SG disassembly, resulting in the fast redistribution of mRNAs from SGs and rapid recovery of stalled translation. The mechanism is that YTHDF2 can regulate SG stability through the interaction with G3BP1 in m<sup>6</sup>A-modified RNA-dependent manner. Our results suggest a mechanism for the interplay between m<sup>6</sup>A modification and SG through YTHDF2 regulation.</div>","PeriodicalId":21609,"journal":{"name":"Science Advances","volume":"10 46","pages":""},"PeriodicalIF":11.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.science.org/doi/reader/10.1126/sciadv.adp5689","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Frailty or resilience? Hazard-based and cumulative phenotype approaches to discerning signals of health inequality in medieval London 虚弱还是复原力?用基于危害和累积表型的方法辨别中世纪伦敦健康不平等的信号
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-13 DOI: 10.1126/sciadv.adq5703
Samantha L. Yaussy, Kathryn E. Marklein, Sharon N. DeWitte, Douglas E. Crews
Bioarchaeology uses human skeletal remains to reconstruct varied experiences of individuals and populations in the past, including patterns of health across time periods and cultural contexts. In the past three decades, bioarchaeological studies have highlighted the concept of “frailty,” operationalizing it as increased risk of mortality or cumulative phenotypes. Using data from medieval London cemeteries, we integrate these two approaches to frailty in past populations. First, we estimate the risks of mortality and survivorship (hazard and survival analyses) associated with 10 biomarkers and use these results to construct population-specific frailty and resilience indices. Then, we apply the indices to adult individuals to explore frailty and resilience differentials between males and females in medieval London. Findings suggest that the male-female morbidity-mortality paradox observed in modern populations may not have existed in this context, which may be explained by preferential cultural buffering of men in this patriarchal, urban setting.
生物考古学利用人类骨骼遗骸来重建个人和人群在过去的各种经历,包括不同时期和文化背景下的健康模式。在过去的三十年里,生物考古学研究强调了 "虚弱 "这一概念,并将其操作化为死亡风险增加或累积性表型。利用中世纪伦敦墓地的数据,我们整合了这两种方法来研究过去人群的虚弱状况。首先,我们估算了与 10 个生物标志物相关的死亡和存活风险(危险和存活分析),并利用这些结果构建了特定人群的虚弱和恢复力指数。然后,我们将这些指数应用于成年个体,以探索中世纪伦敦男性和女性之间的虚弱和恢复力差异。研究结果表明,在现代人口中观察到的男性-女性发病率-死亡率悖论在这种情况下可能并不存在,这可能是由于在这种父权制的城市环境中,男性在文化上更倾向于缓冲。
{"title":"Frailty or resilience? Hazard-based and cumulative phenotype approaches to discerning signals of health inequality in medieval London","authors":"Samantha L. Yaussy,&nbsp;Kathryn E. Marklein,&nbsp;Sharon N. DeWitte,&nbsp;Douglas E. Crews","doi":"10.1126/sciadv.adq5703","DOIUrl":"10.1126/sciadv.adq5703","url":null,"abstract":"<div >Bioarchaeology uses human skeletal remains to reconstruct varied experiences of individuals and populations in the past, including patterns of health across time periods and cultural contexts. In the past three decades, bioarchaeological studies have highlighted the concept of “frailty,” operationalizing it as increased risk of mortality or cumulative phenotypes. Using data from medieval London cemeteries, we integrate these two approaches to frailty in past populations. First, we estimate the risks of mortality and survivorship (hazard and survival analyses) associated with 10 biomarkers and use these results to construct population-specific frailty and resilience indices. Then, we apply the indices to adult individuals to explore frailty and resilience differentials between males and females in medieval London. Findings suggest that the male-female morbidity-mortality paradox observed in modern populations may not have existed in this context, which may be explained by preferential cultural buffering of men in this patriarchal, urban setting.</div>","PeriodicalId":21609,"journal":{"name":"Science Advances","volume":"10 46","pages":""},"PeriodicalIF":11.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.science.org/doi/reader/10.1126/sciadv.adq5703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142602004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Extreme wind events responsible for an outsized role in shelf-basin exchange around the southern tip of Greenland 在格陵兰岛南端陆架-盆地交换过程中发挥巨大作用的极端风力事件
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-13 DOI: 10.1126/sciadv.adp9266
Arthur Coquereau, Nicholas P. Foukal, Kjetil Våge
The coastal circulation around Southern Greenland transports fresh, buoyant water masses from the Arctic and Greenland Ice Sheet near regions of convection, sinking, and deep-water formation in the Irminger and Labrador Seas. Here, we track the pathways and fate of these fresh water masses by initializing synthetic particles in the East Greenland Coastal Current on the Southeast Greenland shelf and running them through altimetry-derived surface currents from 1993 to 2021. We report that the majority of waters (83%) remain on the shelf around the southern tip of Greenland. Variability in the shelf-basin exchange of the remaining particles closely follows the number of tip jet wind events on seasonal and interannual timescales. The probability of a particle exiting the shelf increases almost fivefold during a tip jet event. These results indicate that the number of tip jets is a close proxy of the shelf-basin exchange around Southern Greenland.
格陵兰南部沿岸环流将来自北极和格陵兰冰盖的新鲜浮力水团输送到对流区、下沉区 和厄尔明戈海和拉布拉多海的深水形成区附近。在这里,我们通过在格陵兰东南大陆架的东格陵兰沿岸流中初始化合成粒子,并在 1993 年至 2021 年期间通过测高仪得出的表层流来跟踪这些淡水团的路径和命运。我们的报告显示,大部分水域(83%)留在格陵兰岛南端周围的陆架上。在季节和年际时间尺度上,剩余颗粒的陆架-盆地交换的变化与尖端喷射风事件的数量密切相关。在尖端喷流事件期间,粒子离开陆架的概率几乎增加了五倍。这些结果表明,尖端喷流的数量是南格陵兰周围陆架-盆地交换的近似代表。
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引用次数: 0
Fractional change of scattering and absorbing aerosols contributes to Northern Hemisphere Hadley circulation expansion 散射和吸收气溶胶的分数变化有助于北半球哈德利环流扩张
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-13 DOI: 10.1126/sciadv.adq9716
Tong Ying, Jing Li, Qiang Fu, Guanyu Liu, Lu Zhang, Yan Xia, Yongyun Hu
The relative amount of scattering and absorbing aerosols is essential in determining the aerosol radiative and climate effects. Using reanalysis datasets and climate simulations, here, we show that changes in the relative amount of scattering and absorbing aerosols in the Northern Hemisphere (NH) high latitudes, manifested as long-term decreasing trends in aerosol single-scattering albedo (SSA), have played an important role in driving the widening and weakening trends of the NH Hadley circulation (HC) since the early 1980s. Decreasing SSA in the NH middle and high latitudes can notably warm the troposphere there, thus reducing the equator-to-pole temperature gradient, increasing static stability in mid-latitude regions, and leading to the widening and weakening trends of NH HC. Further analysis of the Coupled Model Intercomparison Project Phase 6 (CMIP6) aerosol forcing–only simulations also supports the importance of SSA trends in perturbing NH HC through the above mechanism.
散射气溶胶和吸收气溶胶的相对数量对于确定气溶胶的辐射和气候效应至关重要。在此,我们利用再分析数据集和气候模拟结果表明,北半球高纬度地区气溶胶散射和吸收相对量的变化(表现为气溶胶单次散射反照率(SSA)的长期下降趋势)对自 20 世纪 80 年代初以来北半球哈德利环流(HC)的扩大和减弱趋势起到了重要的推动作用。北半球中高纬度地区空气散射反照率的降低会显著增暖对流层,从而减小赤道到极地的温度梯度,增加中纬度地区的静态稳定性,导致北半球哈德利环流的扩大和减弱趋势。对耦合模式相互比较项目第 6 阶段(CMIP6)仅气溶胶强迫模拟的进一步分析也支持 SSA 趋势通过上述机制对 NH HC 产生扰动的重要性。
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引用次数: 0
Rubbery organic frameworks (ROFs) toward ultrapermeable CO2-selective membranes 橡胶有机框架(ROFs)用于超渗透二氧化碳选择性膜
IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-11-13 DOI: 10.1126/sciadv.adq5024
Marius Sandru, Marie Prache, Thomas Macron, Lidia Căta, Mehmet Göktuğ Ahunbay, May-Britt Hägg, Guillaume Maurin, Mihail Barboiu
The capture of CO2 is of high interest in our society representing an essential tool to mitigate man-made climate warming. Membrane technology applied for CO2 capture offers several advantages in terms of energy savings, simple operation, and easy scale-up. Glassy membranes are associated with low gas permeability that negatively affect on their industrial implementation. Oppositely, rubbery membranes offer high permeability, but their selectivity is low. Here we report rubbery organic frameworks (ROFs) combining the high permeability of soft matrices with the high sieving selectivity of molecular frameworks. The best performing membranes provide a CO2/N2 selectivity up to 104 with a CO2 permeability up to 1000 Barrer, representing relevant performances for industrial implementation. Water vapors have a positive effect on CO2 permeability, and the CO2/N2 selectivity is higher than in dry conditions, as most of CO2 gas emissions are present in fully humidified gas streams. The synergetic high permeability/selectivity performances are superior to that observed with current state-of-the-art polymeric membranes.
二氧化碳捕集是我们社会高度关注的问题,是减缓人为气候变暖的重要工具。应用于二氧化碳捕集的膜技术在节能、操作简单和易于放大等方面具有多项优势。玻璃膜的气体渗透性较低,这对其工业应用产生了负面影响。相反,橡胶膜具有高渗透性,但其选择性较低。我们在此报告的橡胶有机框架(ROFs)结合了软基质的高渗透性和分子框架的高筛分选择性。性能最好的膜可提供高达 104 的 CO 2 /N 2 选择性和高达 1000 巴勒的 CO 2 渗透性,代表了工业应用的相关性能。水蒸气对 CO 2 的渗透性有积极影响,CO 2 /N 2 的选择性高于干燥条件下的选择性,因为大部分 CO 2 气体排放都存在于完全加湿的气流中。高渗透性/选择性的协同性能优于目前最先进的聚合膜。
{"title":"Rubbery organic frameworks (ROFs) toward ultrapermeable CO2-selective membranes","authors":"Marius Sandru,&nbsp;Marie Prache,&nbsp;Thomas Macron,&nbsp;Lidia Căta,&nbsp;Mehmet Göktuğ Ahunbay,&nbsp;May-Britt Hägg,&nbsp;Guillaume Maurin,&nbsp;Mihail Barboiu","doi":"10.1126/sciadv.adq5024","DOIUrl":"10.1126/sciadv.adq5024","url":null,"abstract":"<div >The capture of CO<sub>2</sub> is of high interest in our society representing an essential tool to mitigate man-made climate warming. Membrane technology applied for CO<sub>2</sub> capture offers several advantages in terms of energy savings, simple operation, and easy scale-up. Glassy membranes are associated with low gas permeability that negatively affect on their industrial implementation. Oppositely, rubbery membranes offer high permeability, but their selectivity is low. Here we report rubbery organic frameworks (ROFs) combining the high permeability of soft matrices with the high sieving selectivity of molecular frameworks. The best performing membranes provide a CO<sub>2</sub>/N<sub>2</sub> selectivity up to 104 with a CO<sub>2</sub> permeability up to 1000 Barrer, representing relevant performances for industrial implementation. Water vapors have a positive effect on CO<sub>2</sub> permeability, and the CO<sub>2</sub>/N<sub>2</sub> selectivity is higher than in dry conditions, as most of CO<sub>2</sub> gas emissions are present in fully humidified gas streams. The synergetic high permeability/selectivity performances are superior to that observed with current state-of-the-art polymeric membranes.</div>","PeriodicalId":21609,"journal":{"name":"Science Advances","volume":"10 46","pages":""},"PeriodicalIF":11.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.science.org/doi/reader/10.1126/sciadv.adq5024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142602006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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