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Environmental changes affect picoplanktonic composition in Antarctic Peninsula ponds

Advances in Polar Science 2024年第1期35卷 108-122页

作者： Micaela dÍAZ Leonardo LAGOMARSInO Gabriela MATALOnI Marianela BELTRÁn Marcela LIBERTELLI Paulina FERMAnI Laboratorio de Ecología Acuática INTECH-UNSAM-CONICETChascomús 7130Argentina Facultad de ciencias naturales y de la Salud UNPSJBComodoro Rivadavia 9000Argentina Laboratorio de Biodiversidad Limnología y Biología de la Conservación3IA-UNSAM-CONICETBuenos Aires 1650Argentina departamento de Biología de Predadores Tope Instituto Antártico ArgentinoBuenos Aires 1650Argentina Laboratorio de Microbiología Ambiental IBIOMAR/CESIMAR-CENPAT-CONICETPuerto Madryn 9120Argentina

Antarctic Peninsula is experiencing one of the largest global warming events *** water bodies generated by the melting of snow in summer are numerous,and they might act as sentinels of climate change due to their rapid response and ability to integrate catchment *** in climate can influence the structure of microbial communities which dominate these freshwaters ***,we characterize three ponds at cierva Point(Antarctic Peninsula)by examining their physico-chemical and morphological characteristics and we explored how different factors modify the structure of the microbial *** studied the abundance and biomass of heterotrophic bacteria,picocyanobacteria and picoeukaryote algae during January and February of two consecutive summers(2017 and 2018).We found that ponds had different limnological characteristics,due to their location,geomorphological features and presence of the surrounding flora and ***-chemical parameters as well as microbial community differed between ponds,months and *** 2017,most ponds were oligo to mesotrophic *** larger accumulated rainfall(as a result of environmental changes on the Antarctic Peninsula)during 2018,particularly in February,causes nutrient runoff into water *** affects those ponds with the highest seabird circulation,such as gentoo penguin,increasing *** a result,picoplanktonic abundances were higher,and the community structure shifts to a largely heterotrophic bacteria dominated *** results suggest that these communities could act as sentinels to environmental changes,anticipating a future with mostly hypertrophic ponds.

关键词： microorganisms freshwater environments climate change cierva Point

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numerical Analysis on the Effect of n-Si on cu(In, Ga)Se₂ Based Thin-Films for High-Performance Solar cells by 1d-ScAPS

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Open Journal of Applied Sciences 2024年第5期14卷 1315-1329页

作者： Rasika n. Mohottige Micheal Farndale Gary S. coombs Shahnoza Saburhhojayeva department of natural Sciences Waldorf University Forest City IA USA

We report the performances of a chalcopyrite cu(In, Ga)Se2 cIGS-based thin-film solar cell with a newly employed high conductive n-Si layer. The data analysis was performed with the help of the 1d-Solar cell capacitance Simulator (1d-ScAPS) software program. The new device structure is based on the cIGS layer as the absorber layer, n-Si as the high conductive layer, i-In2S3, and i-ZnO as the buffer and window layers, respectively. The optimum cIGS bandgap was determined first and used to simulate and analyze the cell performance throughout the experiment. This analysis revealed that the absorber layer’s optimum bandgap value has to be 1.4 eV to achieve maximum efficiency of 22.57%. Subsequently, output solar cell parameters were analyzed as a function of cIGS layer thickness, defect density, and the operating temperature with an optimized n-Si layer. The newly modeled device has a p-cIGS/n-Si/In2S3/Al-ZnO structure. The main objective was to improve the overall cell performance while optimizing the thickness of absorber layers, defect density, bandgap, and operating temperature with the newly employed optimized n-Si layer. The increase of absorber layer thickness from 0.2 - 2 µm showed an upward trend in the cell’s performance, while the increase of defect density and operating temperature showed a downward trend in solar cell performance. This study illustrates that the proposed cell structure shows higher cell performances and can be fabricated on the lab-scale and industrial levels.

关键词： n-Si p-cIGS 1d-ScAPS Thin-Films In2S3

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基于分层穿插多视角点云配准算法研究

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组合机床与自动化加工技术 2024年第8期 28-32页

作者：周文亚马行穆春阳胡冲北方民族大学电气信息工程学院银川750021 北方民族大学宁夏智能信息与大数据处理重点实验室银川750021 北方民族大学机电工程学院银川750021

为解决毛胚铸件三维重建因多视角配准过程中引起的累积误差大、配准精度差以及配准效率低的问题,提出了一种分层穿插多视角点云配准算法。首先,利用工业相机对铸件物体获取不同视角下的点云信息进行预处理;其次,通过邻域法向量夹角特性... 详细信息

为解决毛胚铸件三维重建因多视角配准过程中引起的累积误差大、配准精度差以及配准效率低的问题,提出了一种分层穿插多视角点云配准算法。首先,利用工业相机对铸件物体获取不同视角下的点云信息进行预处理;其次,通过邻域法向量夹角特性提取特征点,并对其进行FPFH特征点描述,对每层相邻点云用改进的4PcS算法进行粗配准,获得良好的初始位置,再利用Kd-tree加速搜索的广义迭代最近点GIcP算法进行精配准;最后,利用分层穿插多视角配准策略拼接成完整的点云。实验结果表明,提出的配准方法相对于SAc-ia+IcP算法、4PcS+IcP算法、Super-4PcS+IcP算法,配准时间分别降低了96.5%、96.1%、88.3%,配准精度分别提高了79.5%、71.5%、55.1%。此算法配准质量不仅优于顺序多视角配准的质量,而且在鲁棒性和精确配准方面有明显优势,对后续三维重建提供了一种高效的方法。

关键词：三维点云配准多视角拼接邻域特征点提取 4PcS

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Two-dimensional atomically thin Pt layers on MXenes: The role of electronic effects during catalytic dehydrogenation of ethane and propane

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nano Research 2024年第3期17卷 1251-1258页

作者： Zhe Li Tobias K.Misicko Fan Yang Xiaopeng Liu Zhenwei Wu Xiaoyang Gao Tao Ma Jeffrey T.Miller daniela S.Mainardi collin d.Wick Zhenhua Zeng Yang Xiao Yue Wu department of chemical and Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA davidson School of chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan center for Materials characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA college of Engineering and Science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized on the surface of Mo2Tic2 MXenes and used for the catalytic dehydrogenation of ethane and propane into ethylene and propylene,two important chemicals for the petrochemical *** compared with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed superior coke-resistance(no deactivation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and selectivity(>95%)toward ethylene and *** unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is *** is found that the electronic effect plays a critical role in dehydrogenative product selectivity and catalyst *** metal–support interaction is found dependent on the substrate and metal components,providing wide opportunities to explore high-performance MXene-supported metallic catalysts.

关键词： MXene catalysis alkane dehydrogenation nanolayers

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design of refractory multi-principal-element alloys for high-temperature applications

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npj computational Materials 2023年第1期9卷 884-893页

作者： Gaoyuan Ouyang Prashant Singh Ranran Su duane d.Johnson Matthew J.Kramer John H.Perepezko Oleg n.Senkov daniel Miracle Jun cui division of Materials Science and Engineering Ames LaboratoryAmesIA 50011USA department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWI 53706USA department of Materials Science and Engineering Iowa State UniversityAmesIA 50011USA Air Force Research Laboratory Materials and Manufacturing DirectorateWright-Patterson Air Force BaseDaytonOH 45433USA

Refractory multi-principal-element alloys(RMPEAs)exhibit high specific strength at elevated temperatures(T).However,current RMPEAs lack a balance of room-temperature(RT)ductility,high-T strength,and high-T creep *** density-functional theory methods,we scanned composition space using four criteria:(1)formation energies for operational stability:-150ngth found via interstitial electron density with Young’s moduli E>250 GPa;(3)inverse Pugh ratio for ductility:G/Bnd(4)high melting points:T_(m)>2500°*** rapid bulk alloy synthesis and characterization,we validated theory and down-selected promising alloy compositions and discovered Mo72.3W12.8Ta10.0Ti2.5Zr2.5 having well-balanced RT and high-T mechanical *** alloy has comparable high-T compressive strength to well-known MonbTaW but is more ductile and more creep *** is also superior to a commercial Mo-based refractory alloy and a nickel-based superalloy(Haynes-282)with improved high-T tensile strength and creep resistance.

关键词： creep alloy alloys

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Targeting hepatic ceruloplasmin mitigates nonalcoholic steatohepatitis by modulating bile acid metabolism

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Journal of Molecular cell Biology 2023年第9期15卷 53-68页

作者： Quanxin Jiang ning Wang Sĳia Lu Jie Xiong Yanmei Yuan Junli Liu Suzhen chen Shanghai diabetes Institute Department of Endocrinology and MetabolismShanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200233China

nonalcoholic steatohepatitis(nASH)is a condition that progresses from nonalcoholic fatty liver disease(nAFLd)and is characterized by hepatic fat accumulation,inflammation,and *** has the potential to develop into cirrhosis and liver cancer,and currently no effective pharmacological treatment is *** this study,we investigate the therapeutic potential of targeting ceruloplasmin(cp),a copper-containing protein predominantly secreted by hepatocytes,for treating *** result show that hepatic cp is remarkedly upregulated in individuals with nASH and the mouse nASH ***-specific cp ablation effectively attenuates the onset of dietary-induced nASH by decreasing lipid accumulation,curbing inflammation,mitigating fibrosis,and ameliorating liver *** employing transcriptomics and metabolomics approaches,we have discovered that hepatic deletion of cp brings about remarkable restoration of bile acid(BA)metabolism during *** deletion of cp effectively remodels BA metabolism by upregulating cyp7a1 and cyp8b1,which subsequently leads to enhanced BA synthesis and notable alterations in BA *** conclusion,our studies elucidate the crucial involvement of cp in nASH,highlighting its significance as a promising therapeutic target for the treatment of this disease.

关键词： ceruloplasmin nonalcoholic steatohepatitis bile acid inflammation fibrosis

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Viscous Modified chaplygin Gas in classical and Loop Quantum cosmology

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chinese Physics Letters 2017年第6期34卷 139-143页

作者： d. Aberkane n. Mebarki S. Benchikh Laboratoire de Physique Mathematique et Subatomique Mentouri University Constantine 25000 Algeria

We investigate the cosmological model of viscous modified chaplygin gas （VMcG） in classical and loop quantum cosmology （LQc）. Firstly, we constrain its equation of state parameters in the framework of standard cosmology from Union 2.1 Sne ia data. Then, we probe the dynamical stability of this model in a universe filled with VMcG and baryonic fluid in LQc background. It is found that the model is very suitable with （χ2/d.o.f = 0.974） and gives a good prediction of the current values of the deceleration parameter q0 =∈ （-0.60, -0.57） and the effective state parameter ωeff∈ （-0.76, -0.74） that is consistent with the recent observational data. The model can also predict the time crossing when （ρdE ≈ Pmatter） at z = 0.75 and can solve the coincidence problem. In LQc background, the Big Bang singularity found in classical cosmology ceases to exist and is replaced by a bounce when the Hubble parameter vanishes at ρtot≈ρc.

关键词： Viscous Modified chaplygin Gas in classical and Loop Quantum cosmology

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Serum levels of the novel adipokine isthmin-1 are associated with obesity in pubertal boys

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World Journal of Pediatrics 2023年第9期19卷 864-872页

作者： Francisco Javier Ruiz‑Ojeda Augusto Anguita‑Ruiz Maria c.Rico Rosaura Leis Gloria Bueno Luis A.Moreno Mercedes Gil‑campos Ángel Gil concepción M.Aguilera department of Biochemistry and Molecular Biology Ⅱ School of PharmacyUniversity of GranadaGranadaSpain Instituto de Investigación Biosanitaria Ibs.grAnAdA 18012 GranadaSpain Institute of nutrition and Food Technology“JoséMataix” Center of Biomedical ResearchUniversity of GranadaAvda.del Conocimiento S/N.18016 ArmillaGranadaSpain RG Adipocytes and Metabolism Institute for Diabetes and ObesityHelmholtz Center Munich85764 MunichGermany Barcelona Institute for Global Health ISGlobal08003 BarcelonaSpain cIBEROBn (Physiopathology of Obesity and Nutrition CB12/03/30038)Institute of Health Carlos Ⅲ(ISCⅢ)28029 MadridSpain Unit of Investigation in Human nutrition Growth and Development of Galicia(GALINUT)University of Santiago de Compostela(USC)Santiago de CompostelaSpain Pediatric nutrition Research group Institute of Sanitary Research of Santiago de Compostela(IDIS)CHUS-USC15706 Santiago de CompostelaSpain Unit of Pediatric Gastroenterology Hepatology and NutritioPediatric ServiceUniversity Clinical Hospital of Santiago(CHUS)15706 Santiago de CompostelaSpain GEnUd Research group Institute of Sanitary Research of Aragón(IIS Aragón)University of ZaragozaZaragozaSpain Instituto Agroalimentario de Aragón(ia2) Universidad de Zaragoza-CITAZaragozaSpain Unit of Pediatric Endocrinology University Clinical Hospital Lozano Blesa50009 ZaragozaSpain Metabolism and Investigation Unit Reina Sofa University HospitalMaimónides Institute of Biomedicine Research of Córdoba(IMIBIC)University of Córdoba14071 CórdobaSpain

Objectives To evaluate whether there is an association between the serum levels of the novel insulin-like adipokine isthmin-1(ISM1)and obesity-related phenotypes in a population of Spanish children and to investigate the plausible molecular alterations behind the alteration of the serum levels of this protein in children with *** The study population is a sub-cohort of the PUBMEP research project,consisting of a cross-sectional population of 119 pubertal children with overweight(17 boys,19 girls),obesity(20 boys,25 girls),and normal weight(17 boys,21 girls).All subjects were classified into experimental groups according to their sex,obesity,and insulin resistance(IR)*** were counted anthropometry,glucose and lipid metabolism,inflammation and cardiovascular biomarkers as well as isthmin-1(ISM1)serum *** population was intended as a discovery population to elucidate the relationship between obesity and ISM1 levels in ***,the study population had blood whole-genome dnA methylation examined,allowing deepening into the obesity–ISM1 molecular *** Higher serum ISM1 levels were observed in boys with obesity than in normal weight(P=0.004)and overweight(P=0.007)***1 serum levels were positively associated with body mass index(BMI)Z-score(P=0.005)and fat mass(P=0.058)and negatively associated with myeloperoxidase(MPO)(P=0.043)in *** we did not find associations between ISM1 serum levels and metabolic outcomes in girls,which may indicate a putative sexual dimorphism,fat mass was positively associated in all children,including boys and girls(P=0.011).dnA methylation levels in two-enhancer-related cpG sites of ISM1(cg03304641 and cg14269097)were associated with serum levels of ISM1 in *** ISM1 is associated with obesity in boys at the pubertal stage,elucidating how this protein might be of special relevance as a new biomarker of obesity in *** studies including a longitudina

关键词： children Epigenetics Isthmin-1 Obesity Puberty

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Introgressions from Oryza rufipogon Increase Photosynthetic Efficiency of KMR3 Rice Lines

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Rice science 2017年第2期24卷 85-96页

作者： G.HARITHA T.VISHnUKIRAn P.YUGAndHAR n.SARLA d.SUBRAHMAnYAM Indian Institute of Rice Research(IcAR) RajendranagarHyderabad 500030India

To understand the wild Oryza genome effect on photosynthesis and its relation to total dry matter accumulation in an elite rice variety, a set of 40 stable introgression lines(ILs) Bc_3F_8 derived from a cross of Oryza sativa(KMR3) × Oryza rufipogon(WR120) were grown under well watered conditions. Leaf gas exchange measurements and leaf chlorophyll estimates were conducted at the flowering stage. The results revealed significant variations in net photosynthetic rate(Pn), transpiration rate(E), transpiration efficiency(Pn/E) and carboxylation efficiency(Pn/c_i). Pn showed significant positive correlation with E, stomatal conductance(g_s), Pn/c_i and total canopy dry matter. Specific leaf area and leaf thickness were not significantly correlated with Pn. Thirty-seven out of 40 ILs showed higher Pn than KMR3 [11.28 μmol/(m^2·s)], and 20 ILs showed higher Pn than WR120 [15.08 μmol/(m^2·s)]. The line IL194 showed the highest Pn [21.62 μmol/(m^2·s)] with increased total canopy dry matter followed by lines IL381, IL106, IL363-12, IL198, IL86-18 and IL50, which exhibited Pn above 18.0 μmol/(m^2·s). The ILs with enhanced Pn are a potential source for developing rice varieties and hybrids with higher biomass and yield.

关键词： photosynthesis wild species rice yield biomass introgression line

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dnA metabarcoding the diet of Podarcis lizards endemic to the Balearic Islands

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current Zoology 2023年第5期69卷 514-526页

作者： Iris Alemany Ana Pérez-cembranos valentín Pérez-Mellado JoséAurelio castro Antònia Picornell cori Ramon JoséA Jurado-Rivera deptartment of Biology Universitat de les Illes BalearsCtra.Valldemossa km 7’5Palma de Mallorca07122Balearic IslandsSpain and department of Animal Biology Universidad de SalamancaCampus Miguel de Unamuno s/n37007SalamancaSpain

dietary studies are essential to unravel the functioning of ecosystems and ultimately to understand *** task,which at first may seem simple,becomes especially complex in those cases of omnivorous species with highly variable *** this regard,the emergence of next-generation dnA sequencing methodologies represents a powerful tool to address the *** we implement a high-throughput metabarcoding strategy based on the analysis of four molecular markers aimed at sequencing both mitochondrial(animal prey)and chloroplast(diet plants)genome fragments from fecal samples of two lizard species endemic to the Balearic Archipelago(Podarcis lilfordi and ***)obtained through non-invasive *** results allowed for the characterization of their diets with a high degree of taxonomic detail and have contributed a large number of new trophic *** reported diets are based mainly on the consumption of arthropods,mollusks and plants from a diversity of taxonomic orders,as well as carrion and marine *** analyses also reveal inter-and intra-specific differences both in terms of seasonality and geographical distribution of the sampled lizard *** molecular findings provide new insights into the trophic interactions of these threatened endemic lizards in their unique and isolated ecosystems.

关键词： Balearic archipelago cOI metabarcoding Podarcis lilfordi Podarcis pityusensis psbA-trnH rbcL trophic ecology

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