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多级孔c/ZnFe_(2)O_(4)/ZnO纳米纤维膜的制备及其光芬顿降解性能研究

化学与生物工程 2024年第11期41卷 22-29页

作者：刘洋彤陶婷婷唐伯威王春蕾黎小芳丁灯闫俊涛武汉轻工大学化学与环境工程学院湖北武汉430023

基于静电纺丝和碱处理-煅烧工艺制备了多级孔c/ZnFe_(2)O_(4)/ZnO(c/ZFO/ZnO)纳米纤维膜,通过XRD、FTIR、SEM、TEM、XPS、Raman、TG等手段对其结构和形貌进行了表征,并研究了其光芬顿降解罗丹明B(RhB)性能。结果表明,在锌盐加量1.0 mmo... 详细信息

基于静电纺丝和碱处理-煅烧工艺制备了多级孔c/ZnFe_(2)O_(4)/ZnO(c/ZFO/ZnO)纳米纤维膜,通过XRD、FTIR、SEM、TEM、XPS、Raman、TG等手段对其结构和形貌进行了表征,并研究了其光芬顿降解罗丹明B(RhB)性能。结果表明,在锌盐加量1.0 mmol、铁盐加量2 mmol、碱处理时间60 min、煅烧温度600℃的最佳条件下制备的c/ZFO/ZnO-2中有多级孔生成,暴露出更多的活性位点;HRTEM照片证实了c/ZFO/ZnO-2中ZnFe_(2)O_(4)/ZnO异质结的形成;c/ZFO/ZnO-2的光生电子-空穴复合率低、分离效率高;c/ZFO/ZnO-2的光芬顿降解效率最高,6 min时RhB降解率达到99.5%;此外,c/ZFO/ZnO-2纳米纤维膜还有较强的磁性能,有利于回收再利用。

关键词：静电纺丝多级孔光芬顿降解 c ZnFe_(2)O_(4) ZnO

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工艺参数对Al2O3–c耐火材料抗氧化和抗水化性能的影响

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耐火材料 2024年

作者：张瑞孙旭东魏瀚袁彪王俊涛袁林刘士范陈松林中国建筑材料科学研究总院瑞泰科技股份有限公司宜兴市耐火材料有限公司江苏省节能环保型冶金用高温耐火材料工程技术研究中心

为了研究制备工艺参数对Al2O3–c耐火材料抗氧化和抗水化性能的影响以优化其制备工艺，以金属Al粉、活性氧化铝粉、鳞片石墨为主要原料，使用热固性酚醛树脂为结合剂，采用液压成型制成?50 mm×50 mm的圆柱体试样，在埋碳气氛下对... 详细信息

为了研究制备工艺参数对Al2O3–c耐火材料抗氧化和抗水化性能的影响以优化其制备工艺，以金属Al粉、活性氧化铝粉、鳞片石墨为主要原料，使用热固性酚醛树脂为结合剂，采用液压成型制成?50 mm×50 mm的圆柱体试样，在埋碳气氛下对试样进行了热处理。选取Al粉加入量（质量分数分别为6%、9%和12%）、石墨加入量（质量分数分别为5%、15%和25%）、热处理温度（680、950、1500 ℃）和保温时间（3、6、9 h）为研究因素，每个因素选取3个水平进行正交设计，分析了各因素对Al2O3–c耐火材料抗氧化和抗水化性能的影响。结果表明：1)Al粉加入量和石墨加入量为影响抗氧化性能的主要因素，而热处理温度和保温时间为次要因素；2)Al粉加入量和热处理温度是影响抗水化性能的主要因素，而石墨加入量和保温时间为次要因素。3)综合考虑，最优工艺为Al粉加入量9%（w）、石墨加入量5%（w）、热处理温度1 500 ℃、保温时间6 h，制备的试样中存在柱状的Al4O4c，能够显著提高材料的抗氧化和抗水化性能。

关键词： Al O -c耐火材料 Al O c 抗水化性能抗氧化性能

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A formal model of checked c

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JOURNAL OF cOMPUTER SEcURITY 2023年第5期31卷 581-614页

作者： Li, Liyi Liu, Yiyun Postol, Deena Lampropoulos, Leonidas Van Horna, David Hicks, Michael Univ Maryland Dept Comp Sci College Pk MD 20742 USA Univ Penn Dept Comp & Informat Sci Philadelphia PA 19104 USA Amazon Arlington VA USA

We present a formal model of checked c, a dialect of c that aims to enforce spatial memory safety. Our model pays particular attention to the semantics of dynamically sized, potentially null-terminated arrays. We formalize this model in coq, and prove that any spatial memory safety errors can be blamed on portions of the program labeled unchecked;this is a checked c feature that supports incremental porting and backward compatibility. While our model's operational semantics uses annotated ("fat") pointers to enforce spatial safety, we show that such annotations can be safely erased. Using PLT Redex we formalize an executable version of our model and a compilation procedure to an untyped c-like language, as well as use randomized testing to validate that generated code faithfully simulates the original. Finally, we develop a custom random generator for well-typed and almost-well-typed terms in our Redex model, and use it to search for inconsistencies between our model and the clang checked c implementation. We find these steps to be a useful way to co-develop a language (checked c is still in development) and a core model of it.

关键词： c checked c spatial safety compiler verification

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An intellectual history of P.c. Ray's papers on the nitrites of mercury

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INDIAN JOURNAL OF HISTORY OF ScIENcE 2023年第1期58卷 20-28页

作者： Dasgupta, Subrata Univ Louisiana Lafayette Sch Comp & Informat Lafayette LA 70504 USA

Prafulla chandra Ray's contribution to the birth and development of an 'Indian school of chemistry' is well documented. But much of this recognition is situated in the realm of the social history of science. My aim in this essay is to view Ray through the lens of intellectual history and, above all, to shed fresh light on his actual contribution to the chemistry of the nitrites of mercury. Toward this end the focus here will be on five of Ray's earliest papers on this family of compounds. We will see that the received narrative that Ray discovered mercurous nitrite is problematic. Examining the texts of his early papers it will be seen that Ray's main contributions to the nitrites of mercury were (i) his apparently serendipitous discovery of a method of synthesizing mercurous nitrite;and (ii) the identification of and solutions to a series of interrelated Kuhnian normal science problems pertaining to this family of compounds. Furthermore (iii) the tools of intellectual history will help discern an underlying 'plot structure' informing the tenure of his work;and finally (iv) we will see that the centre-periphery model that attends the social historiography of science in colonial and post-colonial India plays no role in illuminating Ray's early creative work on the nitrites of mercury.

关键词： P c Ray Mercurous nitrite Intertextual space Plot structure Intellectual history Inorganic chemistry centre-periphery model

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c57Bl/6N mice have an attenuated lung inflammatory response to dsRNA compared to c57Bl/6J and BALB/c mice

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JOURNAL OF INFLAMMATION-LONDON 2023年第1期20卷 6-6页

作者： Tillgren, Sofia Malm Nieto-Fontarigo, Juan Jose cerps, Samuel Ramu, Sangeetha Menzel, Mandy Mahmutovic Persson, Irma Meissner, Anja Akbarshahi, Hamid Uller, Lena Lund Univ Dept Expt Med Sci Unit Resp immunopharmacol Lund Sweden Lund Univ Wallenberg Ctr Mol Med Lund Sweden Univ Augsburg Inst Theoret Med Med Fac Dept Physiol Augsburg Germany Lund Univ Dept Expt Med Sci Lund Sweden Lund Univ Dept Clin Sci Div Resp Med & Allergol Lund Sweden

BackgroundLower respiratory infections caused by ssRNA viruses are a major health burden globally. Translational mouse models are a valuable tool for medical research, including research on respiratory viral infections. In in vivo mouse models, synthetic dsRNA can be used as a surrogate for ssRNA virus replication. However, studies investigating how genetic background of mice impacts the murine lung inflammatory response to dsRNA is lacking. Hence, we have compared lung immunological responses of BALB/c, c57Bl/6N and c57Bl/6J mice to synthetic *** was administered intranasally to BALB/c, c57Bl/6N and c57Bl/6J mice once/day for three consecutive days. Lactate dehydrogenase (LDH) activity, inflammatory cells, and total protein concentration were analyzed in bronchoalveolar lavage fluid (BALF). Pattern recognition receptors levels (TLR3, MDA5 and RIG-I) were measured in lung homogenates using RT-qPcR and western blot. Gene expression of IFN-beta, TNF-alpha, IL-1 beta and cXcL1 was assessed in lung homogenates by RT-qPcR. ELISA was used to analyze protein concentrations of cXcL1 and IL-1 beta in BALF and lung ***/c and c57Bl/6J mice showed infiltration of neutrophils to the lung, and an increase in total protein concentration and LDH activity in response to dsRNA administration. Only modest increases in these parameters were observed for c57Bl/6N mice. Similarly, dsRNA administration evoked an upregulation of MDA5 and RIG-I gene and protein expression in BALB/c and c57Bl/6J, but not c57Bl/6N, mice. Further, dsRNA provoked an increase in gene expression of TNF-alpha in BALB/c and c57Bl/6J mice, IL-1 beta only in c57Bl/6N mice and cXcL1 exclusively in BALB/c mice. BALF levels of cXcL1 and IL-1 beta were increased in BALB/c and c57Bl/6J mice in response to dsRNA, whereas the response of c57Bl/6N was blunt. Overall, inter-strain comparisons of the lung reactivity to dsRNA revealed that BALB/c, followed by c57Bl/6J, had the most pronounced

关键词： BALB c c57Bl 6J 6N dsRNA Poly(I c) Inflammation Lung Mouse models Respiratory viral infection

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[email protected] 2 @Ti 3 c 2 MXene composite S-scheme photocatalyst with excellent bacteriostatic properties

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Journal of colloid and Interface Science 2023年 633卷 836-850页

作者： Zhipeng Mao Wei Hao Wei Wang Fubin Ma chengcheng Ma Shougang chen School of Materials Science and Engineering Ocean University of China Qingdao 266100 P. R. China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology (Qingdao) 168 Wenhai Middle Road Qingdao 266237 P. R. China Institute of Oceanology Chinese Academy of Sciences Qingdao 266000 P. R. China

As an influential antifouling material, photocatalytic materials have drawn attention increasingly over recent years owing to their potential bacteriostatic property in the domain of marine antifouling. Herein, a flower-like [email protected] 2 @Ti 3 c 2 S-scheme photocatalyst was contrived and prepared by hydrothermal method. The innovative combination of Ti 3 c 2 and narrow band gap semiconductor BiOI was implemented to modify ceO 2 and the photocatalytic bacteriostatic mechanism of [email protected] 2 @Ti 3 c 2 was elucidated. Schottky junction was formed between ceO 2 and Ti 3 c 2 , and a p-n junction was formed between ceO 2 and BiOI. By photoelectrochemical characterization, BcT-10 exhibits the best photoelectrochemical performance of which photogenerated carrier transport can be performed more readily at 10 % ceO 2 @Ti 3 c 2 addition. 99.76 % and 99.89 % of photocatalytic bacteriostatic efficiency of BcT-10 against Escherichia coli and Staphylococcus aureus were implemented respectively, which were 2.98 and 3.07 times higher than that of pure ceO 2 . The ternary heterojunction can suppress photogenerated electron-hole complexes more effectively and enhance the photocatalytic bacteriostatic effect of ceO 2 , which also provided a new concept to the further broadened application of ceO 2 in the marine bacteriostatic and antifouling field.

关键词： S-scheme photocatalyst [email protected] 2 @Ti 3 c 2 Photocatalytic bacteriostasis Reactive oxygen species (ROS)

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complement factor H levels are decreased and correlated with serum c-reactive protein in late-onset Alzheimer's disease

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Arquivos de Neuro-Psiquiatria 2023年第2期78卷 76-80页

作者： Guo LU Weihong LIU Xinying HUANG Yanxin ZHAO Dezhou People's Hospital Department of Neurology Dezhou Shandong China. Dezhou People's Hospital Department of Medicine Nuclear Dezhou Shandong China. Jinan Central Hospital Jinan Department of Neurology Shandong China.

Alzheimer’s disease (AD) is the most common cause of dementia. Despite numerous studies on the subject, the pathologies for AD are still unclear and there is still no ideal biomarker for diagnosis. The present study ... 详细信息

关键词： complement factor H late onset Alzheimer's diseases c reactive protein fator H do complemento doença de Alzheimer de início tardio proteína c reativa

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Natural genetic variation in the pheromone production of c. elegans

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PROcEEDINGS OF THE NATIONAL AcADEMY OF ScIENcES OF THE UNITED STATES OF AMERIcA 2023年第26期120卷 e2221150120-e2221150120页

作者： Lee, Daehan Fox, Bennett W. Palomino, Diana Fajardo Panda, Oishika Tenjo, Francisco J. Koury, Emily J. Evans, Kathryn S. Stevens, Lewis Rodrigues, Pedro R. Kolodziej, Aiden R. Schroeder, Frank c. Andersen, Erik c. Northwestern Univ Dept Mol Biosci Evanston IL 60208 USA Kyung Hee Univ Dept Biol Seoul 02447 South Korea Sungkyunkwan Univ Dept Biol Sci Suwon 16419 South Korea Cornell Univ Boyce Thompson Inst Ithaca NY 14850 USA Cornell Univ Dept Chem & Chem Biol Ithaca NY 14850 USA Wellcome Sanger Inst Tree Life Cambridge CB101SA England

From bacterial quorum sensing to human language, communication is essential for social interactions. Nematodes produce and sense pheromones to communicate among individuals and respond to environmental changes. These signals are encoded by different types and mixtures of ascarosides, whose modular structures further enhance the diversity of this nematode pheromone language. Interspecific and intraspecific differences in this ascaroside pheromone language have been described previously, but the genetic basis and molecular mechanisms underlying the variation remain largely unknown. Here, we analyzed natural variation in the production of 44 ascarosides across 95 wild caenorhabditis elegans strains using high- performance liquid chromatography coupled to high- resolution mass spectrometry. We discovered wild strains defective in the production of specific subsets of ascarosides (e.g., the aggregation pheromone icas#9) or short- and medium- chain ascarosides, as well as inversely correlated patterns between the production of two major classes of ascarosides. We investigated genetic variants that are significantly associated with the natural differences in the composition of the pheromone bouquet, including rare genetic variants in key enzymes participating in ascaroside biosynthesis, such as the peroxisomal 3- ketoacyl- coA thiolase, daf-22, and the carboxylesterase cest-3. Genome- wide association mappings revealed genomic loci harboring common variants that affect ascaroside profiles. Our study yields a valuable dataset for investigating the genetic mechanisms underlying the evolution of chemical communication.

关键词： c elegans pheromone natural variation ascaroside fatty acid metabolism

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Altitude and slope aspects as the key factors affecting the change of c:N:P stoichiometry in the leaf-litter-soil system of alpine timberline ecotones of the Sygera Mountains in Southeast Tibet, china

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GEODERMA REGIONAL 2023年 32卷

作者： He, Peng Lu, Jie Ren, Yihua Li, Jiangrong Hou, Lei Deng, Xiangsheng Gao, Tan cheng, Fei Tibet Agr & Anim Husb Univ Inst Tibet Plateau Ecol Nyingchi 860000 Xizang Peoples R China Tibet Agr & Anim Husb Univ Key Lab Forest Ecol Tibet Plateau Minist Educ Nyingchi 860000 Xizang Peoples R China Guangxi Univ Coll Forestry Guangxi Key Lab Forest Ecol & Conservat Nanning 530004 Peoples R China

Understanding the altitudinal distribution patterns of ecological stoichiometry is essential for understanding biogeochemical processes in mountainous forests. However, the changes in ecological stoichiometry throughout the leaf-litter-soil system on the different slope aspects in mountainous forests ecosystems are not fully under-stood. To fill these gaps, we examined the altitudinal patterns of c:N:P stoichiometry in the leaf-litter-soil system and nutrient resorption of dominant tree species in the alpine timberline ecotones on the sunny and shady slopes of the Sygera Mountains in Southeast Tibet, china. Three timberline plants were selected: Sabina saltuaria (S. saltuaria), Abies georgei (A. georgei) and Rhododendron aganniphum (R. aganniphum). The c, N, and P contents and c:N:P stoichiometry of R. aganniphum in the leaf and foliar litter varied widely along the altitudes, and those of soil showed similar trends. The leaf c:N of R. aganniphum, soil c, and soil c:N on the sunny slope increased with increasing altitudes. Furthermore, the N and P contents in the leaf and foliar litter of timberline plants on the shady slope were significantly higher than those on the sunny slope, whereas the c, c:N, c:P, and N:P ratios in the leaf and foliar litter exhibited the opposite trend. R. aganniphum had the highest nitrogen resorption ef-ficiency (NRE) and phosphorus resorption efficiency (PRE), whereas A. georgei had the lowest. The PRE of R. aganniphum increased with increasing altitudes, which may be driven by the soil c:N ratio. According to leaf N: P ratios and the relative resorption hypothesis, the leaf N:P ratio was 5.55, 8.70 and 2.86 corresponding to NRE equal to PRE for S. saltuaria, A. georgei and R. aganniphum, respectively. It suggests that the timberline ecotones plants in this study were P-limited, although this limitation may not be responsible for the formation of tim-berlines in the the Sygera Mountains. Varying degrees of correlations exist between elem

关键词： c N P stoichiometry Leaf-litter-soil system Nutrient resorption Alfisols Timberline ecotones

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Walk before you run: Feasibility challenges and lessons learned from the PROcLAIM study, a multicenter randomized controlled trial of misoprostol for prevention of recurrent c. difficile during cOVID-19

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ANAEROBE 2023年第1期80卷 102699页

作者： Lavieri, Robert R. Dubberke, Erik R. McGill, Sarah K. Bartelt, Luther Smith, Stephanie A. Pandur, Balint K. Phillips, Sharon E. Vermillion, Krista Shirey-Rice, Jana Pulley, Jill Xu, Yaomin Lindsell, christopher J. Zaleski, Nicole Jerome, Rebecca Doster, Ryan S. Aronoff, David M. Vanderbilt Univ Vanderbilt Inst Clin & Translat Res VICTR Med Ctr Nashville TN USA Washington Univ Sch Med St Louis Dept Med St Louis MO USA Univ N Carolina Sch Med Dept Med Chapel Hill NC USA Vanderbilt Univ Med Ctr Dept Biostat Nashville TN USA Univ Louisville Sch Med Dept Med Louisville KY USA Indiana Univ Sch Med Dept Med Indianapolis IN USA Indiana Univ Sch Med Dept Med 545 Barnhill DrEH 305 Indianapolis IN 46202 USA

We analyzed our challenging experience with a randomized controlled trial of misoprostol for preven-tion of recurrent c. difficile. Despite careful prescreening and thoughtful protocol modifications to facilitate enrollment, we closed the study early after enrolling just 7 participants over 3 years. We share lessons learned, noting the importance of feasibility studies, inclusion of biomarker outcomes, and dissemination of such findings to inform future research design and implementation successes.(c) 2023 Elsevier Ltd. All rights reserved.

关键词： c difficile Misoprostol BioVU PheWAS clostridioides difficile Trial design

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