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Natural organic matter quantification in the waters of a semiarid freshwater wetland (Tablas de Daimiel, Spain)

Journal of Environmental sciences 2013年第1期25卷 114-123页

作者： Montserrat Filella juan Carlos rodríguez-Murillo franc ois Quentel Institute F.-A. Forel University of Geneva10 route de SuisseCH-1290 Versoix Switzerland Museo Nacional de Ciencias Naturales CSICSerrano 115 E-28006 MadridSpain Laboratoire de Chimie Analytique UMR-CNRS 6521 Universit de Bretagne Occidentale6 avenue V.Le GorgeuCS 93837F-29238 Brest Cedex 3France

Dissolved organic matter （DOM） concentrations have been measured in the waters of a semiarid freshwater wetland, the Tablas de Daimiel, Spain, when the system-characterised by variable hydroperiodicity conditions, was completely flooded （February 2011）. Fluxes of DOM from the wetland soils to the overlying waters were measured by using a passive diffusion sampler （peeper）. Not only dissolved organic carbon （DOC） concentrations were measured but refractory organic matter （ROM, usually known as humic substances） was also quantified using a novel voltammetric method. Fluorescence spectra were recorded to help in selecting the appropriate standard for ROM quantification, test the homogeneity of DOM in the waters and get an indication of their source. The results obtained show a 7-fold increase in measured ROM concentrations from the Gigtiela River to the outlet, which points to a net exportation of ROM from the wetland and to the existence of an internal source of ROM in the system, probably diffusion from the wetland soils. This hypothesis is confirmed by the flux of ROM from the soils to the water column measured with the peeper and by the common fluorescence characteristics of colunm and interstitial waters. The smaller increase in DOC concentrations along the wetland, in spite of the higher DOC fluxes from soils, suggests that there is significant turnover of organic carbon （OC） in the water column. The system acts as a major carbon sink but, when flooded, exports .OC as DOM.

关键词： organic carbon natural organic matter refractory organic matter DOC ROM humic wetland Daimiel

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Qualitative exploration of home life experiences and care needs among elderly patients with temporary intestinal stomas

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World Journal of Gastroenterology 2024年第22期30卷 2893-2901页

作者： Si-Meng Wang Jian-Ling Jiang Rui Li juan-juan Wang Chun-Hong Gu Jia Zeng Xiao-Hui Wei Mei Chen Wuxi Medical College of Jiangnan University Jiangnan UniversityWuxi 214122Jiangsu ProvinceChina Department of Gastrointestinal Surgery Tongren Hospital Shanghai Jiao Tong University School of MedicineShanghai 200335China Department of Nursing Tong Ren Hospital Shanghai Jiao Tong University School of MedicineShanghai 200335China

BACKGROUND This study employed a phenomenological research approach within qualitative research to explore the challenges encountered by elderly individuals with temporary colostomies in managing their daily lives and care *** the anus surgery combined with temporary colostomy has emerged as a prevalent treatment modality for low rectal ***,the ileostomy is susceptible to peri-stoma skin complications,as well as fluid,electrolyte,and nutritional imbalances,posing challenges to effective *** successful selfmanagement of patients is intricately linked to their adjustment to temporary colostomy;nonetheless,there remains a dearth of research examining the factors influencing self-care among temporary colostomy patients and the obstacles they *** To investigate the lived experiences,perceptions,and care requirements of temporary colostomy patients within their home environment,with the ultimate goal of formulating a standardized management *** Over the period of June to August 2023,a purposive sampling technique was utilized to select 12 patients with temporary intestinal stomas from a tertiary hospital in Shanghai,*** a phenomenological research approach,a semi-structured interview guide was developed,and qualitative interviews were conducted using in-depth interview *** acquired data underwent coding,analysis,organization,and summarization following Colaizzi’s seven-step *** The findings of this study revealed that the experiences and needs of patients with temporary intestinal stomas can be delineated into four principal themes:Firstly,Temporary colostomy patients bear various burdens and concerns about the uncertainty of disease progression;secondly,patients exhibit limited self-care capabilities and face information deficits,resulting in heightened reliance on healthcare professionals;thirdly,patients demonstrate the potential for internal motivation through proactive self-adj

关键词： Elderly Temporary intestinal stomas Life experiences Intestinal ostomy complications Qualitative study

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Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films

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Chinese Journal of Polymer science 2024年第2期42卷 230-238,I0009页

作者： Yun-Peng Li Hao-Ran Shen Shao-juan Wang Hao Zhang Jian Hu Rui Xin Xiao-Li Sun Shou-Ke Yan Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science&TechnologyQingdao266042China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Poly(lactic acid)(PLA) as a bio-based polymer with biodegradability and biocompatibility has attracted much attention. To manipulate its properties for different applications, regulation of crystal structure and crystalline morphology becomes an attractive research topic. In this work, the structure evolution of layered samples containing an amorphous poly(D-lactide)(PDLA) layer and a crystalline poly(L-lactide)(PLLA)layer with highly oriented edge-on α lamellar crystals after annealing at 150 ℃ or/and after melt-recrystallization has been studied by AFM, FTIR,and TEM combined with electron diffraction. The results demonstrate that melt recrystallization of the as-prepared sample leads to the formation of abundant randomly oriented PLA stereo-complex(PLA sc) crystals. Annealing at 150 ℃ results in the formation of a small amount of oriented PLA sc crystals at the interface. These PLA sc crystals show great impact on the recrystallization behavior of sample after melting at 190 ℃ and then crystallizing at 90 ℃. First, they impede the mutual diffusion of the overlying PDLA and underlying PLLA, and thus reduce their stereocomplexation ability as manifested by the decreased amount of PLA sc crystals. Second, they act as substrate to initiate the epitaxial crystallization of the overlying PDLA and underlying PLLA, which ensures the production of a highly oriented structure of PDLA and PLLA after melt recrystallization again.

关键词： Poly(L-lactide) Poly(D-lactide) Double layer Stereocomplex

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The proximity between hydroxyl and single atom determines the catalytic reactivity of Rh1/CeO_(2) single-atom catalysts

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Nano Research 2024年第1期17卷 397-406页

作者： Danfeng Wu Shuyun Zhou Congcong Du juan Li Jianyu Huang Hong-xia Shen Abhaya K.Datye Shan Jiang Jeffrey T.Miller Sen Lin Haifeng Xiong State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China College of Biology and Chemical Engineering Jiaxing UniversityJiaxing 314000China Department of Chemical&Biological Engineering University of New MexicoAlbuquerqueNM 8731-0001USA Davidson school of Chemical Engineering Purdue UniversityWest LafayetteIN 47907-2100USA Innovation Laboratory for sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China Fujian Key Laboratory of Rare-earth Functional Materials Fujian Shanhai Collaborative Innovation Center of Rare-earth Functional MaterialsLongyan 366300China

The local structure of the metal single-atom site is closely related to the catalytic activity of metal single-atom catalysts(SACs).However,constructing SACs with homogeneous metal active sites is a challenge due to the surface heterogeneity of the conventional ***,we prepared two Rh1/CeO_(2)SACs(0.5Rh1/r-CeO_(2)and 0.5Rh1/c-CeO_(2),respectively)using two shaped CeO_(2)(rod and cube)exposing different facets,i.e.,CeO_(2)(111)and CeO_(2)(100).In CO oxidation reaction,the T100 of 0.5Rh1/r-CeO_(2)SACs is 120°C,while the T100 of 0.5Rh1/c-CeO_(2)SACs is as high as 200°*** in-situ CO diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFTS),we found that the proximity between OH group and Rh single atom on the plane surface plays an important role in the catalytic activity of Rh1/CeO_(2)SAC system in CO *** Rh single atom trapped at the CeO_(2)(111)crystal surface forms the Rh1(OH)adjacent species,which is not found on the CeO_(2)(100)crystal surface at room ***,during CO oxidation,the OH group far from Rh single atom on the 0.5Rh1/c-CeO_(2)disappears and forms Rh1(OH)adjacent species when the temperature is above 150°*** formation of Rh1(OH)adjacentCO intermediate in the reaction is pivotal for the excellent catalytic activity,which explains the difference in the catalytic activity of Rh single atoms on two different CeO_(2)*** formed Rh1(OH)adjacent-O-Ce structure exhibits good stability in the reducing atmosphere,maintaining the Rh atomic dispersion after CO oxidation even when pre-reduced at high temperature of 500°*** functional theory(DFT)calculations validate the unique activity and reaction path of the intermediate Rh1(OH)adjacentCO species *** work demonstrates that the proximity between metal single atom and hydroxyl can determine the formation of active intermediates to affect the catalytic performances in catalysis.

关键词： crystal plane Rh1/CeO_(2)single-atom catalyst proximity of Rh and hydroxyl coordination structure CO oxidation

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Few-shot skin cancer detection based on many-objective optimization

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Kongzhi yu Juece/Control and Decision 2024年第11期39卷 3597-3606页

作者： Zhao, Jia-Hui Wen, Jie Cai, Xing-juan Cui, Zhi-Hua Shanxi Key Laboratory of Big Data Analysis and Parallel Taiyuan University of Science and Technology Taiyuan 030024 China Shanxi Key Laboratory of Advanced Control and Equipment Ⅰntelligence Taiyuan University of Science and Technology Taiyuan 030024 China

Due to the long-tailed distribution characteristics of skin cancer data, quickly identifying rare skin disease samples with small amounts of data becomes a challenging few-shot problem. The detection method based on meta-learning can quickly learn meta-knowledge from the majority of common classes skin disease classes and use prior knowledge to improve the model’s ability to detect rare skin diseases. However, the bias in the quality and distribution of public skin cancer categories leads to the risk of overfitting in the pre-training phase of meta-learning, and meta-learning models based on traditional networks struggle to handle fine-grained skin disease problems. Affronting this issue, a many-objective meta-learning skin cancer detection model is proposed. The proposed model optimizes the distribution of common classes (base classes) by considering various classification performances of the skin cancer detection model, thus obtaining quality-enhanced training samples. And it adopts the ResNet12 network structure integrated with the CCNet attention model, which can significantly enhance the ability to identify fine-grained skin lesion images. Additionally,an improved many-objective optimization algorithm with discrete grouping strategy is designed to efficiently solve the proposed model. Some experiments are conducted on two public medical datasets, ⅠscⅠ2018 and Derm7pt. The proposed many-objective skin detection model achieves detection accuracies of 67 %, 79 %, and 82 % respectively on binary classification tasks with 1-shot, 3-shot, and 5-shot learning,which validates the effectiveness of the model. © 2024 Northeast University. All rights reserved.

关键词： Contrastive Learning

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微创青光眼手术研究进展

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中华实验眼科杂志 2024年第6期42卷 576-583页

作者：王琳艳(综述) 叶娟(审校) 浙江大学医学院附属第二医院眼科中心杭州310009

青光眼是全球主要的不可逆性致盲眼病,传统的青光眼手术存在损伤结膜和巩膜组织,影响二次手术等缺点。近年来,有诸多关于微创青光眼手术(MIGS)的研究探索,旨在降低眼压、减少患者药物负担的同时,尽量减少对眼部的创伤。从解剖上考虑,房... 详细信息

青光眼是全球主要的不可逆性致盲眼病,传统的青光眼手术存在损伤结膜和巩膜组织,影响二次手术等缺点。近年来,有诸多关于微创青光眼手术(MIGS)的研究探索,旨在降低眼压、减少患者药物负担的同时,尽量减少对眼部的创伤。从解剖上考虑,房水经小梁网流出的阻力同时来自于近端(小梁网、schlemm管内壁)和远端(schlemm管外壁、集液管、房水静脉、巩膜内静脉丛),因此可以把小梁网相关的MIGS手术根据作用位点的不同,分为解除近端阻力(增加小梁网旁路、扩张schlemm管及小梁网切开)和同时解除远端、近端阻力的手术(Xen Gel Stent和PRESERFLO Microshunt)。此外,还有一些MIGS术式通过增加经脉络膜上腔途径引流或破坏睫状体减少房水生成,达到降低眼压的目的。增加脉络膜上腔引流的术式具有不依赖于眼压高低的优势,代表术式有Cypass Micro-Stent、iStent Supra和iSTAR MINIject。微创的睫状体破坏手术则包括超声睫状体成形术、微脉冲睫状体光凝术、内镜下睫状体光凝术等。MIGS虽然具有创伤更小、可有效控制眼压的优势,但其远期有效性及安全性仍有待严密观察。由于各种新型MIGS术式种类繁多,且大多仍处于临床试验阶段,尚未进入我国市场,因此对国内眼科医生来说相对陌生。本文就目前主流的MIGS术式原理及术后效果进行综述。

关键词：青光眼微创青光眼手术眼压

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Seasonal variation and chemical composition of particulate matter： A study by XPS, ICP-AES and sequential microanalysis using Raman with SEM/EDS

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Journal of Environmental sciences 2018年第12期30卷 32-49页

作者： Lucy T.González franc.sc. E.Longoria-rodríguez Margarita Sánchez-Domínguez Cesar Leyva-Porras Karim Acuna-Askar Boris I.Kharissov Alejandro Arizpe-Zapata juan M.Alfaro-Barbosa Universidad Autónoma de Nuevo León Facultad de Ciencias Químicas Laboratorio de Química Analítica AmbientalCódigo Postal 64570MaonterreyN.L.Mexico Centro de Investigación en Materiales Avanzados sc Unidad MonterreyAlianza Notre 202 Código Postal 66628 Apodaca Nueuo León Mexico Centro de Investigación en Materiales Avanzados sc Miguel de Cervantes # 120 Código Postal 31109 Chihuahua Chih. Mexico Universidad Autónoma de Nuevo León Facultad de Medicina Laboratorio de Biorremediación AmbientalCódigo Postal 64460 MonterreyN.L. Mexico

During the winter period（January–March 2016）, the total suspended particles（TSP） and particulate matter smaller than 2.5 μm（PM2.5） were characterized by the application of various analytical techniques in four zones of the Metropolitan Area of Monterrey in Mexico. To evaluate the seasonal variation of some elements in the particulate matter, the results of this study were compared with those obtained during the summer season（July–September 2015）. The speciation of the C_（1s） signal by X-ray photoelectron spectroscopy revealed the contribution of aromatic and aliphatic hydrocarbons as the main components in both seasons. Conversely, carboxylic groups associated with biogenic emissions were detected only in winter. The percentages of SO_4^（2-） ions were lower in winter, possibly caused by the decrease in the solar radiation, and relative humidity recorded. The results of the ICP analysis revealed that Fe, Zn and Cu were the most abundant metals in both TSP and PM2.5 in the two seasons. There were significant seasonal variations for concentrations of As, Ni and Zn in the urban area and for Fe, As, Cd, Ni and Zn in the industrial zone. This was attributed to the greater burning of fuels as well as to an increase in vehicular traffic, the effect of thermal inversion and changes in some meteorological parameters. The results of the sequential microanalysis by Raman spectroscopy and SEM/EDS allowed observation of deposits of carbonaceous material on the particles and to perform the speciation of particles rich in Fe and Pb, which helped infer their possible emission sources.

关键词： Seasonal variation Total suspended particles PM2.5 X-ray photoelectron spectroscopy Micro-Raman spectroscopy

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Debaryomyces hansenii supplementation in low fish meal diets promotes growth,modulates microbiota and enhances intestinal condition in juvenile marine fish

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Journal of Animal science and Biotechnology 2024年第1期15卷 253-276页

作者： Ignasi Sanahuja Alberto Ruiz Joana P.Firmino Felipe E.Reyes-López juan B.Ortiz-Delgado Eva Vallejos-Vidal Lluis Tort Dariel Tovar-Ramírez Isabel M.Cerezo Miguel A.Moriñigo Carmen Sarasquete Enric Gisbert Aquaculture Program Institute of Agrifood Research and Technology(IRTA)La Rapita 43540Spain Centro de Biotecnologia Acuicola Universidad de Santiago de ChileSantiagoChile Instituto de Ciencias Marinas de Andalucia(ICMAN-CSIC) Avda.Republica Saharaui no 2Campus Universitario Rio San PedroPuerto RealCadiz 11510Spain Nucleo de Investigaciones Aplicadas en Ciencias Veterinarias y Agronomicas Facultad de Medicina Veterinaria y AgronomiaUniversidad de Las AmericasSantiagoChile Department of Cell Biology Physiologyand ImmunologyUniversitat Autonoma de BarcelonaBarcelonaSpain Centro de Investigaciones Biologicas del Noroeste sc CIBNORLa PazMexico Department of Microbiology Instituto de Biotecnologia Y Desarrollo Azul(IBYDA)Faculty of SciencesUniversity of Malaga29010 MalagaSpain scBI Bioinformatic UnitUniversity of Malaga29590 MalagaSpain

Background The development of a sustainable business model with social acceptance,makes necessary to develop new strategies to guarantee the growth,health,and well-being of farmed *** hansenii is a yeast species that can be used as a probiotic in aquaculture due to its capacity to i)promote cell proliferation and differen-tiation,ii)have immunostimulatory effects,iii)modulate gut microbiota,and/or iv)enhance the digestive *** provide inside into the effects of *** on juveniles of gilthead seabream(Sparus aurata)condition,we inte-grated the evaluation of the main key performance indicators coupled with the integrative analysis of the intestine condition,through histological and microbiota state,and its transcriptomic *** After 70 days of a nutritional trial in which a diet with low levels of fishmeal(7%)was supplemented with 1.1%of ***(17.2×10^(5) CFU),an increase of ca.12%in somatic growth was observed together with an improve-ment in feed conversion in fish fed a yeast-supplemented *** terms of intestinal condition,this probiotic modu-lated gut microbiota without affecting the intestine cell organization,whereas an increase in the staining intensity of mucins rich in carboxylated and weakly sulphated glycoconjugates coupled with changes in the affinity for certain lectins were noted in goblet *** in microbiota were characterized by the reduction in abundance of several groups of Proteobacteria,especially those characterized as opportunistic *** microarrays-based transcrip-tomic analysis found 232 differential expressed genes in the anterior-mid intestine of ***,that were mostly related to metabolic,antioxidant,immune,and symbiotic *** Dietary administration of *** enhanced somatic growth and improved feed efficiency param-eters,results that were coupled to an improvement of intestinal condition as histochemical and transcriptomic tools *** probiotic ye

关键词： Debaryomyces hansenii Intestine condition Low fish meal diet Microbiota Transcriptomics Yeast probiotic

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5月中国土壤湿度异常对7月华南-青藏高原东部偶极子型降水年际变化的影响

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大气科学学报 2024年第1期47卷 108-123页

作者：王娟范可徐志清中山大学大气科学学院南方海洋科学与工程广东省实验室(珠海)广东珠海519082 中国科学院大气物理研究所北京100029

利用1979—2019年ERA5再分析资料和站点降水资料,研究了5月中国土壤湿度异常对7月华南和青藏高原东部偶极子型降水年际变化的影响及其可能的物理过程。结果表明,当5月青藏高原土壤湿度偏湿,华中地区土壤湿度偏干时,对应7月华南(高原东部... 详细信息

利用1979—2019年ERA5再分析资料和站点降水资料,研究了5月中国土壤湿度异常对7月华南和青藏高原东部偶极子型降水年际变化的影响及其可能的物理过程。结果表明,当5月青藏高原土壤湿度偏湿,华中地区土壤湿度偏干时,对应7月华南(高原东部)降水偏多(偏少),两地降水呈偶极子型分布。通过进一步的诊断分析发现,青藏高原(华中地区)土壤湿度正(负)异常可从5月持续至7月,使得7月中国北方地区地表湍流热通量正异常,进而使得对流层中低层大气增暖,中国北方与贝加尔湖之间经向温度梯度和大气斜压性增强,天气尺度的瞬变波活动增强。通过瞬变的涡度强迫有利于中国北方及蒙古地区准正压异常高压和Rossby波波源的形成,相关的Rossby波向东南方向传播至我国南方,使得华南地区出现准正压结构的异常低压,有利于西北太平洋副热带高压东移,南亚高压西移。对应中国北方及蒙古-华南地区对流层中低层为反气旋-气旋式环流异常,进而导致华南地区(高原东部)降水增多(减少)。此外,中国北方-蒙古地区的异常高压与局地偏干的土壤湿度之间的正反馈过程,有利于上述物理过程的维持和增强,进而有利于7月偶极子降水的异常,反之亦然。

关键词： 5月土壤湿度 7月华南-青藏高原东部偶极子型降水年际变化影响机制

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英语专业讲好中国故事课程建设——以“综合英语”为例

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英语教师 2024年第8期24卷 40-42,46页

作者：黄娟四川外国语大学成都学院四川成都611844

基于问卷调查和访谈结果,分析英语专业学生中国人文素养现状和“综合英语”课程讲好中国故事存在的问题。构建讲好中国故事“综合英语”课程建设模型,从实证角度夯实学生中国人文素养知识,树立文化自信,提升讲好中国故事的能力,培养担... 详细信息

基于问卷调查和访谈结果,分析英语专业学生中国人文素养现状和“综合英语”课程讲好中国故事存在的问题。构建讲好中国故事“综合英语”课程建设模型,从实证角度夯实学生中国人文素养知识,树立文化自信,提升讲好中国故事的能力,培养担当民族复兴大任的高素质英语人才。

关键词：讲好中国故事英语专业 “综合英语” 课程建设

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