检索结果-南通市图书馆

Gut microbiota in preterm infants receiving breast milk or mixed feeding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of clinical pediatrics 2024年第2期13卷 135-145页

作者： sandra Gabriela sánchez-González Bárbara Gabriela cárdenas-del-castillo Elvira Garza-González Gerardo R padilla-Rivas Isaías Rodríguez-Balderrama consuelo Treviño-Garza Fernando Félix montes-Tapia Gerardo c palacios-saucedo Anthony Gutiérrez-Rodríguez manuel Enrique de-la-O-cavazos Department of pediatrics Hospital Universitario“Dr.JoséEleuterio González”Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Departamento de Bioquímica y medicina molecular Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Department of Biochemistry and molecular medicine Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Department of pediatric surgery Hospital Universitario"Dr.JoséEleuterio González"Monterrey 64460Nuevo LeónMéxico

BAcKGROuND preterm birth is the leading cause of mortality in newborns,with very-low-birthweight infants usually experiencing several *** milk is considered the gold standard of nutrition,especially for preterm infants with delayed gut colonization,because it contains beneficial microorganisms,such as Lactobacilli and *** To analyze the gut microbiota of breastfed preterm infants with a birth weight of 1500 g or *** An observational study was performed on preterm infants with up to 36.6 wk of gestation and a birth weight of 1500 g or less,born at the university Hospital ***éEleuterio González at monterrey,mexico.A total of 40 preterm neonates were classified into breast milk feeding(Bm)and mixed feeding(mF)groups(21 in the Bm group and 19 in the mF group),from October 2017 to June *** samples were collected before they were introduced to any feeding *** full enteral feeding was achieved,the composition of the gut microbiota was analyzed using 16s rRNA gene *** variables were compared using student’s t-test or using the mann–Whitney u test for nonparametric ***,evenness,equitability,margalef’s index,Fisher’s alpha,chao-1 index,and shannon’s diversity index were also *** No significant differences were observed at the genus level between the *** comparison indicated higher counts of Alphaproteobacteria and Betaproteobacteria in the initial compared to the final sample of the Bm group(pcounts of Gammaproteobacteria were detected in the final than in the initial sample(p=0.040).According to the margalef index,Fisher’s alpha,and chao-1 index,a decrease in species richness from the initial to the final sample,regardless of the feeding type,was observed(pur predominant phyla were Bacteroidetes,Actinobacteria,Firmicutes,and proteobacteria,with proteobacteria being the most ***,no significant differences were

关键词： Gut microbiota Human milk preterm infant proteobacteria Very low birth weight 16s rRNA

climate-influenced vector-borne diseases in Africa: a call to empower the next generation of African researchers for sustainable solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

贫困所致传染病(英文) 2024年第2期13卷 1-10页

作者： Obame-Nkoghe Judica?l Agossou Adjoavi Esse mboowa Gerald Kamgang Basile caminade cyril Duke Dawn c. Githeko Andrew Karanja Ogega Obed m. Elloué Nestor Engone sarr Fatou Bintou Nkoghe Dieudonné Kengne pierre Ndam Nicaise T. paupy christophe Bockarie moses Otomo patricks Voua molecular and cellular Biology Laboratory (Labmc) Biology Department University of Science and Technology of Masuku BP Franceville Gabon Ecology and Health Research unit Interdisciplinary Center for Medical Research of Franceville BP Franceville Gabon Department of Zoology and Entomology Faculty of Natural and Agricultural Sciences University of the Free State Private Bag x13 Phuthaditjhaba Republic of South Africa Laboratory of pharmacology and Improved Traditional medicines Department of Animal Physiology Faculty of Science and Technology University of Abomey-Calavi BP Cotonou Benin The African center of Excellence in Bioinformatics and Data-Intensive sciences Infectious Diseases Institute College of Health Sciences Makerere University P. O Box Kampala Uganda Africa centers for Disease control and prevention African Union Commission Roosevelt Street P.O. Box WKAddis Ababa Ethiopia centre for Research in Infectious Diseases P.O. Box Yaoundé Cameroon Earth system physics Department The Abdus Salam International Centre for Theoretical Physics Trieste Italy Africa Research Excellence Fund Charterhouse Street London EC1MHR UK community Health support program P.O. Box Kisumu Kenya The African Academy of sciences Nairobi Kenya center for phylosophical studies and Research (cERp) Omar Bongo University (UOB) BP Libreville Gabon umRED Health Training and Research Unit University of Iba Der Thiam of Thiès BP Thiès Senegal National parasitic Diseases control program Ministry of Health Libreville Gabon mIVEGEc Univ. Montpellier CNRS IRD Montpellier France mERIT IRD Paris Cité University Paris France Department of parasitology Noguchi Memorial Institute for Medical Research University of Ghana LG Accra Ghana school of community Health sciences Njala University Bo Sierra Leone

We look at the link between climate change and vector-borne diseases in low- and middle-income countries in Africa. The large endemicity and escalating threat of diseases such as malaria and arboviral diseases, intensified by climate change, disproportionately affects vulnerable communities globally. We highlight the urgency of prioritizing research and development, advocating for robust scientific inquiry to promote adaptation strategies, and the vital role that the next generation of African research leaders will play in addressing these challenges. Despite significant challenges such as funding shortages within countries, various pan-African-oriented funding bodies such as the African Academy of sciences, the Africa Research Excellence Fund, the Wellcome Trust, the u.s. National Institutes of Health, and the Bill and melinda Gates Foundation as well as initiatives such as the African Research Initiative for scientific Excellence and the pan-African mosquito control Association, have empowered (or are empowering) these researchers by supporting capacity building activities, including continental and global networking, skill development, mentoring, and African-led research. This article underscores the urgency of increased national investment in research, proposing the establishment of research government agencies to drive evidence-based interventions. collaboration between governments and scientific communities, sustained by pan-African funding bodies, is crucial. Through these efforts, African nations are likely to enhance the resilience and adaptive capacity of their systems and communities by navigating these challenges effectively, fostering scientific excellence and implementing transformative solutions against climate-sensitive vector-borne diseases.

关键词： climate change Vector-borne diseases Africa Environmental justice Research and development pan-African funding initiatives

EurBesT——商业养蜂条件下的抗螨蜂种选育

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国蜂业 2024年第2期75卷 22-23页

作者： R.Buechler A.uzunov c.costa m.meixner Y Le conte F.mondet m.Kovacic s.Andonov N.L.carreck L.Dimitrov B.Basso m.Bienkowska R.Dall’Olio F.Hatjina u.Wirtz 陈超(文\图) 单金琼(文\图) 不详

上期我们讲了抗螨蜜蜂的选育以及取得的成效,本期我们继续讨论选育抗螨蜜蜂过程中遇到的问题及建议。一、种蜂王的用户调查对目前蜂王市场的调查显示,客户的期望值很高,但满意度一般。欧洲养蜂人希望买到高品质的蜂王,其中最重要的是抗... 详细信息

上期我们讲了抗螨蜜蜂的选育以及取得的成效,本期我们继续讨论选育抗螨蜜蜂过程中遇到的问题及建议。一、种蜂王的用户调查对目前蜂王市场的调查显示,客户的期望值很高,但满意度一般。欧洲养蜂人希望买到高品质的蜂王,其中最重要的是抗病和高产。但是,他们对抗病性的满意度最低(图1)。近50%的用户认为选择育种是实现免用药养蜂的重要甚至唯一的手段。具有悠久育种传统的国家的用户对选择育种的认可率更高。

关键词：选择育种用户调查蜂王问题及建议抗螨养蜂人蜜蜂商业养蜂

维普期刊数据库博看期刊

Analysis of a stagnation point Flow with Hybrid Nanoparticles over a porous medium

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & materials processing 2023年第2期19卷 541-567页

作者： u.s.mahabaleshwar T.Anusha m.Hatami Department of mathematics Davangere UniversityShivagangothriDavangereIndia Department of mechanical Engineering Ferdowsi University of MashhadMashhadIran

The unsteady stagnation-point flow of a hybrid nanofluid over a stretching/shrinking sheet embedded in a porous medium with mass transpiration and chemical reactions is *** momentum and mass transfer problems are combined to form a system of partial differential equations,which is converted into a set of ordinary differential equations via similarity *** ordinary differential equations are solved analytically to obtain the solution for velocity and concentration profiles in exponential and hypergeometric forms,*** concentration profile is obtained for four different cases namely constant wall concentration,uniform mass flux,general power law wall con-centration and general power law mass *** effect of different physical parameters such as Darcy number Da^(1-1),mass transpiration parameter V_(c),stretching/shrinking parameter (d),chemical reaction parameter(β)and schmidt number (sc)on velocity and concentration profile is *** show that,the axial velocity will decreases as the shrinking sheet parameter increases,regardless of whether the suction or injection case is *** concentration decreases with an increase in the shrinking sheet parameter and the chemical reaction rate parameter.

关键词： chemical reaction parameter mass transpiration hybrid nanofluid porous medium schmidt number

Bioremediation potential of the macroalga ulva lactuca (chlorophyta) for Ammonium Removal in Elastomer Industry Wastewater

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Bioscience and Biotechnology 2024年第6期15卷 325-343页

作者： Diego Lelis Alex Enrich-prast camille R. chaves Thuane mendes Anacleto Roberta R. c. pereira Vinicius p. de Oliveira programa de ps-Graduao em Biotecnologia Vegetal e Bioprocessos Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil unidade multiusurio de Anlises Ambientais Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Institute of marine science Federal University of So Paulo (IMar/UNIFESP) Santos Brazil Department of Thematic studiesEnvironmental change and Biogas solutions Research center (BsRc) Linkping University Linkping Sweden Department of marine Biology Institute of Biology Federal University of Rio de Janeiro Rio de Janeiro Brazil

During the production of nitrile rubber, significant amounts of nitrogen in the form of ammonium are generated in the wastewater. The discharge of this high-nitrogen wastewater can lead to serious environmental issues, including eutrophication, disruption of aquatic ecosystems, and groundwater contamination. To mitigate these impacts, this research explored the bioremediation capabilities of the macroalgae ulva lactuca (chlorophyta) for removing nitrogen from nitrile rubber production wastewater. The study employed single-phase and michaelis-menten decay models based on ammonium consumption, using various dilutions of wastewater to identify the optimal concentration for treatment. The physiological state of the macroalgae was monitored by measuring the photosynthetic capacity and specific growth rate during the experiments. In the presence of u. lactuca, ammonium concentrations decreased in all treatment groups, confirming that the ammonium kinetics conformed to both applied models. Our results show that u. lactuca effectively reduces ammonium concentrations, with an approximate removal rate of 0.020 µm·g−1·min−1 across different wastewater concentrations (70%, 80%, 90%, and 100%). Notably, the treatments with 70%, 80%, and 90% wastewater strength achieved about 67% reduction in ammonium, demonstrating the alga’s capacity to treat high-nitrogen wastewater. The photosynthetic performance of u. lactuca initially declined in control conditions but stabilized across all treatments, highlighting its adaptability. The kinetic analysis using the michaelis-menten model indicated a Vmax of 1342 μm·g−1·Dmh−1, suggesting a robust capacity for ammonium uptake when fully saturated. Our study underscores the potential of ulva lactuca as a cost-effective and efficient agent for wastewater bioremediation, particularly in settings with high nitrogen loads.

关键词： photosynthetic Quantum Yield One-phase Decay model michaelis-menten model Nitrogen physiological parameters Elastomers

Optimization of performance of the Km2A full array using the crab Nebula

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese physics c 2024年第6期48卷 169-178页

作者：曹臻 F.Aharonian 安琪阿西克古白云翔包逸炜 D.Bastieri 毕效军毕玉江蔡金庭曹晴曹文羽曹喆常进常劲帆陈尚明陈恩生陈亮陈林陈龙陈明君陈玛丽陈起辉陈素弘陈天禄陈阳程宁程耀东崔明阳崔树旺崔晓红崔昱东戴本忠代洪亮戴子高单增罗布 D.della Volpe 董绪强段凯凯樊军辉范一中方军方堃冯存峰封莉冯少辉丰晓婷冯有亮 s.Gabici 高博高川东高林青高启高卫高伟康葛茂茂耿利斯 G.Giacinti 龚光华苟全补顾旻皓郭福来郭晓磊郭义庆郭莹莹韩毅昂何会海贺昊宁何佳银何新波何钰 m.Heller 贺远强侯博文侯超侯贤胡红波胡铨胡世聪黄代绘黄天奇黄文俊黄性涛黄晓渊黄勇黄志成季筱璐贾焕玉贾康江琨姜晓巍姜泽军金敏康明铭柯通 D.Kuleshov.K.Kurinov 李兵兵李澄李骢李丹李飞李海波李会财李华阳李军李剑李捷李凯李文龙李文莲李秀荣李昕李一卓李哲黎卓梁恩维梁云峰林苏杰刘冰刘成刘栋刘虎刘海东刘佳刘江来刘金艳刘茂元柳若愚刘四明刘伟刘怡刘以农鲁睿罗晴吕洪魁马伯强马玲玲马欣华毛基荣闵振 W.mitthumsiri 穆慧君南云程 A.Neronov 区子维庞彬宇 p.pattarakijwanich 裴致远齐孟尧祁业情乔冰强秦家军 D.Ruffolo A.sáiz D.semikoz 邵澄宇邵琅 O.shchegolev 盛祥东舒富文宋慧超 Yu.V.stenkin V.stepanov 苏扬孙秦宁孙晓娜孙志斌谭柏轩唐庆文唐泽波田文武王超王昌贝王广威王洪光王惠惠王建成汪凯王利苹王玲玉王培汉王冉王为王祥高王祥玉王阳王玉东王岩谨王忠海王仲翔王振王铮韦大明魏俊杰魏永健文韬吴超勇吴含荣武莎吴雪峰吴雨生席邵强夏捷夏君集项光漫肖迪泫肖刚辛广广辛玉良邢祎熊峥徐东莲徐仁峰徐仁新徐伟立薛良闫大海颜景志颜田杨朝文杨帆杨冯帆杨何文杨佳盈杨莉莉杨明洁杨睿智杨深邦姚玉华姚志国叶一锰尹丽巧尹娜游晓浩游智勇于艳红袁强岳华曾厚敦曾婷轩曾玮查敏张彬彬张丰张海明张恒英张建立张丽霞张力张鹏飞张佩佩张瑞张少博张少如张寿山张潇张笑鹏张云峰张毅张勇赵兵赵静赵雷赵立志赵世平郑福周斌周浩周佳能周猛周平周荣周勋秀祝成光祝凤荣朱辉朱科军左雄 LHAAsO collaboration Key Laboratory of particle Astrophyics&Experimental physics Division&computing center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of chinese Academy of sciences Beijing 100049China Tianfu cosmic Ray Research center Chengdu 610000China Dublin Institute for Advanced studies 31 Fitzwilliam Place2 DublinIreland max-planck-Institut for Nuclear physics P.O.Box 10398069029 HeidelbergGermany state Key Laboratory of particle Detection and Electronics China university of science and Technology of china Hefei 230026China school of physical science and Technology&school of Information science and Technology Southwest Jiaotong UniversityChengdu 610031China school of Astronomy and space science Nanjing UniversityNanjing 210023China center for Astrophysics Guangzhou UniversityGuangzhou 510006China Hebei Normal university Shijiazhuang 050024China Key Laboratory of Dark matter and space Astronomy&Key Laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Tsung-Dao Lee Institute&school of physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Research in Galaxies and cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Key Laboratory of cosmic Rays(Tibet university) Ministry of EducationLhasa 850000TibetChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China school of physics and Astronomy(Zhuhai)&school of physics(Guangzhou)&sino-French Institute of Nuclear Engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275China school of physics and Astronomy Yunnan UniversityKunming 650091China Département de physique Nucléaire et corpusculaire Facultéde SciencesUniversitéde Genève24 Quai Ernest Ansermet1211 GenevaSwitzerland Institute of Frontier and Interdisciplinary science Shandong UniversityQingdao 266237China Apc Universit'e Paris Cit'eCNRS/IN2P3CEA/IRFUObservat

The full array of the Large High Altitude Air shower Observatory(LHAAsO)has been in operation since July *** its kilometer-square array(Km2A),we optimized the selection criteria for very high and ultrahigh energyγ-rays using data collected from August 2021 to August 2022,resulting in an improvement in significance of the detection in the crab Nebula of approximately 15%,compared with that of previous *** the implementation of these new selection criteria,the angular resolution was also significantly improved by approximately 10%at tens of *** aspects of the full Km2A array performance,such as the pointing error,were also calibrated using the crab *** resulting energy spectrum of the crab Nebula in the energy range of 10-1000 TeV are well fitted by a log-parabola model,which is consistent with the previous results from LHAAsO and other experiments.

关键词： γ-ray crab Nebula significance

Effects of mechanical vibration on the physical,metallurgical and mechanical properties of cast A308(Lm21)aluminum alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of minerals,metallurgy and materials 2022年第6期29卷 1206-1215页

作者： siddharth Yadav s.p.Tewari J.K.singh s.c.Ram Department of mechanical Engineering Indian Institute of Technology(BHU)Varanasi 221005India Department of metallurgical Engineering Indian Institute of Technology(BHU)Varanasi 221005India

This study investigated the microstructure,physical,and mechanical properties of die-cast A308 alloy subjected to mechanical vibration during *** frequencies(0,20,30,40,and 50 Hz)at constant amplitude(31μm)were employed using a power amplifier as the power input device.X-ray diffraction,optical microscopy,and scanning electron microscopy were used to examine the morphological changes in the cast samples under stationary and vibratory *** features of the castings were evaluated using Image J *** average values of metallurgical features,including primaryα-Al grain size,dendrite arm spacing,average area of eutectic silicon,aspect ratio,and percentage porosity,reduced by 34%,59%,56%,22%,and 62%,respectively,at 30 Hz frequency compared with stationary *** tests of the cast samples showed that the yield strength(Ys),ultimate tensile strength(uTs),percentage elongation(%EL),and microhardness(HV)increased by 8%,13%,17%,and 16%,respectively,at 30 Hz frequency compared with stationary *** fractured surface of the tensile specimens exhibited mixed-mode fracture behavior because of brittle facets,cleavage facets,ductile tearing,and dimple *** presence of small dimples showed that plastic deformation occurred before fracture.

关键词： mechanical vibration microstructures microhardness tensile strength fractography

维普期刊数据库

OcTOpOD:single-bunch tomography for angular-spectral characterization of laser-driven protons

在线全文

学校读者我要写书评

暂无评论

High power Laser science and Engineering 2023年第6期11卷 16-28页

作者： m.Reimold s.Assenbaum E.Beyreuther E.Bodenstein F.-E.Brack c.Eisenmann F.Englbrecht F.Kroll F.Lindner u.masood J.pawelke u.schramm m.schneider m.sobiella m.E.p.umlandt m.Vescovi K.Zeil T.Ziegler J.metzkes-Ng Helmholtz-Zentrum Dresden-Rossendorf DresdenGermany Technische universität Dresden DresdenGermany OncoRay-National center for Radiation Research in Oncology DresdenGermany Ludwig-maximilians-universität münchen Garching/MünchenGermany universitätsklinikum Freiburg FreiburgGermany

Laser-plasma accelerated(LpA)proton bunches are now applied for research fields ranging from ultra-high-dose-rate radiobiology to material ***,the capabilities to characterize the spectrally and angularly broad LpA bunches lag behind the rapidly evolving *** OcTOpOD translates the angularly resolved spectral characterization of LpA proton bunches into the spatially resolved detection of the volumetric dose distribution deposited in a liquid *** to 24 multi-pinhole arrays record projections of the scintillation light distribution and allow for tomographic reconstruction of the volumetric dose deposition pattern,from which proton spectra may be *** the OcTOpOD at a cyclotron,we show the reliable retrieval of various spatial dose deposition patterns and detector sensitivity over a broad dose ***,the OcTOpOD was installed at an LpA proton source,providing real-time data on proton acceleration performance and attesting the system optimal performance in the harsh laser-plasma environment.

关键词： laser-plasma acceleration of protons proton detector tomographic reconstruction

维普期刊数据库

Bulking up the Bay-position substituents Enables Enhanced selectivity of c_(s)‑symmetric Boron subphthalocyanine−subnaphthalocyanine Hybrids

在线全文

学校读者我要写书评

暂无评论

precision chemistry 2024年第4期2卷 161-181页

作者： Nina F.Farac Alan J.Lough Timothy p.Bender Department of chemical Engineering and Applied chemistry University of TorontoTorontoOntario M5S 3E5Canada Department of chemistry University of TorontoTorontoOntario M5S 3H6Canada Department of materials science and Engineering University of TorontoTorontoOntario M5S 3E4Canada Department of mechanical and Industrial Engineering University of TorontoTorontoOntario M5S 3G8Canada

The precise synthesis of subporphyrinoid hybrids withπ-expanded topologies and unique material properties plays a promising role in the design of functional ***,selective,and controllable routes to boron subphthalocyanine−subnaphthalocyanine hybrids,Bsub(pc_(3‑p)-Nc_(p))s,are desirable for this purpose yet synthetically challenging due to random mixtures of c_(s-),c_(3v-),and,in some cases,c_(1)-symmetric compounds that form during traditional statistical mixed ***,we addressed this issue by developing a sterically driven mixed cyclotrimerization with enhanced selectivity for the targeted c_(s)-symmetric hybrid and complete suppression of sterically crowded macrocyclic *** process,coupled with a rationally designed precursor bearing bulky phenyl substituents,enabled the synthesis and characterization of bay-position phenylated ph_(2)-(R_(p))_(8)Bsub(pc_(2)-Nc_(1))hybrids with halogens(Rp=cl or F)in their peripheral isoindole *** selectivity ranged between 59 and 72%with remarkable yields,significantly higher than that of conventional mixed *** findings were augmented by theoretical calculations on precursor Lewis basicity as guiding principles into hybrid macrocycle ***,the incorporation of unfused phenyl groups and halogen atoms into the hybrid framework resulted in fine-tuned optical,structural,electronic,and electrochemical *** straightforward approach achieved improved selectivity and controlled narrowing of the product distribution,affording the efficient synthesis of structurally sophisticated Bsub(pc_(2)-Nc_(1))*** then expands the library of 3-dimensionalπ-extended macrocycles for use in a range of applications,such as in optoelectronic devices with precisely tailored optical properties.

关键词： subphthalocyanine hybrids low-symmetry aromatic macrocycle selective cyclotrimerization sterically driven chemistry broad absorption material properties