检索结果-南通市图书馆

Gastrointestinal and liver infections in children undergoing antineoplastic chemotherapy in the years 2000

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2016年第25期22卷 5853-5866页

作者： Elio Castagnola Eliana Ruberto alfredo Guarino Infectious Diseases Unit Istituto Giannina Gaslini Department of Translational Medical Science Section of Pediatrics University of Naples Federico II

AIM: To review gastrointestinal and liver infections in children undergoing antineoplastic chemotherapy. To look at gut microflora features in oncology ***: We selected studies published after year 2000, excluding trials on transplanted pediatric patients. We searched English language publications in MEDLINE using the keywords: "gastrointestinal infection AND antineoplastic chemotherapy AND children", "gastrointestinal infection AND oncology AND children", "liver infection AND antineoplastic chemotherapy AND children", "liver abscess AND chemotherapy AND child", "neutropenic enterocolitis AND chemotherapy AND children", "thyphlitis AND chemotherapy AND children", "infectious diarrhea AND children AND oncology", "abdominal pain AND infection AND children AND oncology", "perianal sepsis AND children AND oncology", "colonic pseudo-obstruction A N D o n c o l o g y A N D c h i l d A N D c h e m o t h e r a p y ", "microflora AND children AND malignancy", "microbiota AND children AND malignancy", "fungal flora AND children AND malignancy". We also analysed evidence from several articles and book ***: Gastrointestinal and liver infections represent a major cause of morbidity and mortality in children undergoing antineoplastic chemotherapy. Antineoplastic drugs cause immunosuppression in addition to direct toxicity, predisposing to infections, although the specific risk is variable according to disease and host features. Common pathogens potentially induce severe diseases whereas opportunistic microorganisms may attack vulnerable hosts. Clinical manifestations can be subtle and not specific. In addition, several conditions are rare and diagnostic process and treatments are not standardized. Diagnosis may be challenging, however early diagnosis is needed for quick and appropriate interventions. Interestingly, the source of infectionin those children can be exogenous or endogenous. Indeed, mucosal damage may allow the penetrance of endogenous micr

关键词： Gastrointestinal tract Liver Microflora Infection Oncology Chemotherapy Children

Declining metabolic scaling parallels an ontogenetic change from elongate to deep-bodied shapes in juvenile Brown trout

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2023年第3期69卷 294-303页

作者： Jorge-Ruben Sanchez-Gonzalez alfredo G.Nicieza Department of Organisms andSystems Biology University of Oviedo33006O OviedoSpain Biodiversity Research Institute(IMIB) University of Oviedo-Principality of Asturias-CSIC33600 MieresSpain Department of Animal Science-Wildlife Section University of Lleida25006 LleidaSpain

Body shape and metabolic rate can be important determinants of animal performance,yet often their effects on influential traits are evaluated in a non-integrated *** creates an important gap because the integration between shape and metabolism may be crucial to evaluate metabolic scaling ***,we measured standard metabolic rate in 1-and 2-years old juvenile brown trout Salmo trutta,and used a geometric morphometrics approach to extricate the effects of ontogeny and size on the link between shape and metabolic *** evidenced near-isometric ontogenetic scaling of metabolic rate with size,but also a biphasic pattern driven by a significant change in metabolic scaling,from positive to negative ***,the change in metabolic allometry parallels an ontogenetic change from elongate to deep-bodied *** is consistent with the dynamic energy budget(DEB)and surface area(SA)theories,but not with the resource transport network theory which predicts increasing allometric exponents for trends towards more robust,three-dimensional *** addition,we found a relationship between body shape and size independent metabolic rate,with a positive correlation between robustness and metabolic rate,which fits well within the view of Pace-of-Life Syndromes(POLS).Finally,our results align with previous studies that question the universality of metabolic scaling exponents and propose other mechanistic models explaining the diversity of metabolic scaling relationships or emphasizing the potential contribution of ecological factors.

关键词： biphasic allometric scaling metabolic rate ontogenetic allometry shape surface-area trout

Accurate and efficient band-gap predictions for metal halide perovskites at finite temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 2267-2279页

作者： Haiyuan Wang Alexey Tal Thomas Bischoff Patrick Gono alfredo Pasquarello Chaire de Simulationàl’Echelle Atomique(CSEA) Ecole Polytechnique Fédérale de Lausanne(EPFL)LausanneCH-1015Switzerland

We develop a computationally efficient scheme to accurately determine finite-temperature band gaps for metal halide perovskites belonging to the class ABX_(3)(A=Rb,Cs;B=Ge,Sn,Pb;and X=F,Cl,Br,I).First,an initial estimate of the band gap is provided for the ideal crystalline structure through the use of a range-separated hybrid functional,in which the parameters are determined non-empirically from the electron density and the high-frequency dielectric ***,we consider two kinds of band-gap corrections to account for spin-orbit coupling and thermal vibrations including zero-point *** particular,the latter effect is accounted for through the special displacement method,which consists in using a single distorted configuration obtained from the vibrational frequencies and eigenmodes,thereby avoiding lengthy molecular *** sequential consideration of both corrections systematically improves the band gaps,reaching a mean absolute error of 0.17 eV with respect to experimental *** computational efficiency of our scheme stems from the fact that only a single calculation at the hybrid-functional level is required and that it is sufficient to evaluate the corrections at the semilocal level of *** scheme is thus convenient for the screening of large databases of metal halide perovskites,including large-size systems.

关键词： theory. perovskite halide

NO-ARBITRAGE SYMMETRIES

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2022年第4期42卷 1373-1402页

作者： Iván DEGANO Sebastián FERRANDO alfredo GONZáLEZ Departamento de Matemática.Facultad de Ciencias Exactas y Naturales Universidad Nacional de Mar del Plata 7600Argentina Department of Mathematics Ryerson University350 Victoria St.TorontoOntario M5B 2K3Canada

The no-arbitrage property is widely accepted to be a centerpiece of modern financial mathematics and could be considered to be a financial law applicable to a large class of(idealized) *** paper addresses the following basic question:can one characterize the class of transformations that leave the law of no-arbitrage invariant?We provide a geometric formalization of this question in a non probabilistic setting of discrete time-the so-called trajectorial *** paper then characterizes,in a local sense,the no-arbitrage symmetries and illustrates their meaning with a detailed *** context makes the result available to the stochastic setting as a special case.

关键词： No arbitrage symmetry convexity preserving maps non-probabilistic markets

The use of intracorneal ring segments in keratoconus

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2016年第1期3卷 66-72页

作者： alfredo Vega-Estrada Jorge L.Alio Keratoconus Unit Vissum AlicanteCalle Cabanal1 Edificio Vissum03016 AlicanteSpain Division of Ophthalmology Universidad Miguel HernandezAlicanteSpain

Keratoconus is a corneal degeneration that usually appears during puberty and may seriously deteriorate the quality of life of the *** corneal disease is today the first indication of corneal transplantation in young *** the last decade of the XX century,keratoplasty procedures were the only alternative to treat this pathological *** the beginning of the XXI century,intracorneal ring segments implantation was proposed as a therapeutic choice for treating keratoconus *** then,several published articles have reported the benefits of this surgical procedure in treating this type of corneal ectatic *** purpose of the present investigative work is to summarize the characteristic of the intracorneal ring segments and also to review the different features published in the literature in relation to this surgical technique for the treatment of keratoconus patients.

关键词： Keratoconus Corneal ectasia Intracorneal rings

High philopatry rates of Yellow-legged Gulls in the southeastern part of the Bay of Biscay

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2021年第3期12卷 391-398页

作者： Sergio Delgado alfredo Herrero Asier Aldalur Juan Arizaga Department of Ornithology Aranzadi Sciences SocietyZorroagagaina 1120014 DonostiaSpain

Background:Philopatry rate is one of the main factors shaping population dynamics in colonial *** rates of philopatry are linked to populations with high dispersal,while high rates are linked to populations with a very high spatial structure pattern(i.e.,metapopulations).The Cantabrian Yellow-legged Gull(Larus michahellis)population is considered to be resident,with relatively low dispersal *** estimations of its philopatry rates are however still ***,we aimed to estimate philopatry rates in the main Yellow-legged Gull colonies of the province of Gipuzkoa,in the southeastern part of the Bay of ***:We analysed 734 resightings,during the breeding season at the colonies of Getaria,Santa Clara and Ulia,relative to a total of 3245 individuals ringed at birth in these same colonies during a period of 13 *** data were analysed using Multi-State Recapture models in ***:After controlling survival and resighting probability,the average dispersal rate among colonies was 4%(±SD=2%)when individuals are immature,decreasing to 1±1%)for adult breeding gulls(i.e.,philopatry rate was 99%).Annual survival rates were assessed to be 0.27±0.02 for birds in their first year of life and 0.87±0.01 for older *** probability of observing immature birds in the colonies was 0.08±0.01,as compared to 0.21±0.02 in adult ***:We obtained evidence of extremely high local philopatry rates,clearly within the upper limit found in gulls.A high philopatry favour a speciation in these species who are vulnerable to obtain the main food source(land-fills and fishing discard)which are transforming under new ecological process.

关键词： Dispersal rates Metapopulation Philopatry Ringing Survival Seagulls

Heavy ion ranges from first-principles electron dynamics

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 799-805页

作者： Andrea E.Sand Rafi Ullah alfredo A.Correa Department of Physics University of HelsinkiP.O.Box 43FI-00014 HelsinkiFinland Quantum Simulations Group Lawrence Livermore National LaboratoryLivermoreCA 94550USA CIC nanoGUNE Ave.Tolosa 7620018 Donostia-San SebastiánSpain Departamento de Física de Materiales UPV/EHUPaseo Manuel de Lardizabal 320018 Donostia-San SebastiánSpain

The effects of incident energetic particles,and the modification of materials under irradiation,are governed by the mechanisms of energy losses of ions in *** complex processes affecting projectiles spanning many orders of magnitude in energy depend on both ion and electron *** multi-scale modeling methods that correctly capture the relevant processes is crucial for predicting radiation effects in diverse *** this work,we obtain channeling ion ranges for tungsten,a prototypical heavy ion,by explicitly simulating ion trajectories with a method that takes into account both the nuclear and the electronic stopping *** electronic stopping power of self-ion irradiated tungsten is obtained from first-principles timedependent density functional theory(TDDFT).Although the TDDFT calculations predict a lower stopping power than SRIM by a factor of three,our result shows very good agreement in a direct comparison with ion range *** results demonstrate the validity of the TDDFT method for determining electronic energy losses of heavy projectiles,and in turn its viability for the study of radiation damage.

关键词： stopping governed dynamics

HIGHLY OSCILLATORY DIFFUSION-TYPE EQUATIONS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2013年第6期31卷 549-572页

作者： Sevda Uskiiplii Altlnbasak Marissa Condon alfredo Deano Arieh Iserles Department of Applied Mathematics and Theoretical Physics Centre for Mathematical Sciences University of Cambridge Cambridge UK School of Electronic Engineering Dublin City University Dublin Ireland Department of Mathematics University Carlos III de Madrid Madrid Spain Department of Applied Mathematics and Theoretical Physics Centre for Mathematical Sciences University of Cambridge Cambridge UK

We explore new asymptotic-numeric solvers for partial differential equations with highly oscillatory forcing terms. Such methods represent the solution as an asymptotic series, whose terms can be evaluated by solving non-oscillatory problems and they guarantee high accuracy at a low computational cost. We consider two forms of oscillatory forcing terms, namely when the oscillation is in time or in space： each lends itself to different treatment. Numerical examples highlight the salient features of the new approach.

关键词： Diffusion-type PDEs High oscillation Asymptotic expansions Modulated Fourier expansions.

Asymptotic solvers for ordinary differential equations with multiple frequencies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2015年第11期58卷 2279-2300页

作者： CONDON Marissa DEAO alfredo GAO Jing ISERLES Arieh School of Electronic Engineering Dublin City University Departmento de Matematicas Universidad Carlos III de Madrid School of Mathematics and Statistics Xi'an Jiaotong University DAMTP Centre for Mathematical SciencesUniversity of Cambridge

We construct asymptotic expansions for ordinary differential equations with highly oscillatory forcing terms,focusing on the case of multiple,non-commensurate *** derive an asymptotic expansion in inverse powers of the oscillatory parameter and use its truncation as an exceedingly effective means to discretize the differential equation in *** examples illustrate the effectiveness of the method.

关键词： highly oscillatory problems ordinary differential equation modulated Fourier expansions multiple frequencies numerical analysis