检索结果-南通市图书馆

Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 818-828页

作者： Arturo Román-Messina alejandro Castillo-Tapia David A.Román-García Marcos A.Hernández-ortega Carlos A.Morales-Rergis Claudia M.Castro-Arvizu Center for Research and Advanced Studies(CINVESTAV)of the National Polytechnic Institute of Mexico GuadalajaraJal.45017Mexico Instituto Tecnológico y de Estudios Superiores de Monterrey GuadalajaraJal.45070Mexico Autonomous University of Guadalajara GuadalajaraJal.45129Mexico Centro de Enseñanza Técnica Industrial and he is also with UAGGuadalajaraJal.44638Mexico

The primary goal in the analysis of hierarchical distributed monitoring and control architectures is to study the spatiotemporal patterns of the interactions between areas or *** this paper,a novel conceptual framework for distributed monitoring of power system oscillations using multiblock principal component analysis(MB-PCA)and higher-order singular value decomposition(HOSVD)is proposed to understand,characterize,and visualize the global behavior of the power *** proposed framework can be used to evaluate the influence of a given area or utility on the oscillatory behavior,uncover low-dimensional structures from high-dimensional data,and analyze the effects of heterogeneous data on the modal characteristics and interpretation of power *** metrics are then investigated to examine the relationships between the dynamic patterns and participation of individual data blocks in the global behavior of the *** application of these techniques is demonstrated by case studies of two systems:a 14-machine test system and a 5449-bus 635-generator equivalent model of a large power system.

关键词： Distributed monitoring multiblock principal component analysis(MB-PCA) higher-order singular value decomposition(HOSVD) Tucker decomposition

A pilot study of the modulation of sirtuins on arylamine N-acetyltransferase 1 and 2 enzymatic activity

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2018年第2期8卷 188-199页

作者： Eneida Turiján-Espinoza Rául alejandro Salazar-González Edith Elena Uresti-Rivera Gloria Estela Hernández-Hernández Montserrat ortega-Juárez Rosa Milán Diana Portales-Pérez Laboratory of Immunology and Cellular and Molecular Biology Faculty of Chemical Science UASLP Laboratory of Biopharmacy and Pharmacokinetics Faculty of Chemical Science UASLP

Arylamine N-acetyltransferase(NAT; E.C. 2.***.1.5) enzymes are responsible for the biotransformation of several arylamine and hydrazine drugs by acetylation. In this process, the acetyl group transferred to the acceptor substrate produces NAT deacetylation and, in consequence, it is susceptible of degradation. Sirtuins are protein deacetylases, dependent on nicotine adenine dinucleotide,which perform post-translational modifications on cytosolic proteins. To explore possible sirtuin participation in the enzymatic activity of arylamine NATs, the expression levels of NAT1, NAT2,SIRT1 and SIRT6 in peripheral blood mononuclear cells(PBMC) from healthy subjects were examined by flow cytometry and Western blot. The in situ activity of the sirtuins on NAT enzymatic activity was analyzed by HPLC, in the presence or absence of an agonist(resveratrol) and inhibitor(nicotinamide) of sirtuins. We detected a higher percentage of positive cells for NAT2 in comparison with NAT1, and higher numbers of SIRT1t cells compared to SIRT6 in lymphocytes. In situ NAT2 activity in the presence of NAM inhibitors was higher than in the presence of its substrate, but not in the presence ofresveratrol. In contrast, the activity of NAT1 was not affected by sirtuins. These results showed that NAT2 activity might be modified by sirtuins.

关键词： Arylamine N-acetyltransferase NAT Sirtuins Peripheral blood mononuclear cells Nicotinamide Resveratrol

Main factors affecting lacertid lizard thermal ecology

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2019年第3期14卷 293-305页

作者： Zaida ortega Francisco Javier MARTÍN-VALLEJO Postgraduate Program in Ecology and Conservation Federal University of Mato Grosso do SulCampo GrandeMato Grosso do SulBrazil Department of Statistics University of SalamancaSpain

The thermal ecology of ectotherms has been studied for almost 2 centuries,but additional attention is currently being paid to it,to understand how organisms deal with the environment in a climate change context.A consensus is still far away due to the large number of factors involved and their complex *** this context,3 analyses in lacertid lizards were carried out:(i)a meta-analysis,to test for differences between body and air temperatures from 71 populations;(ii)a meta-analysis concerning correlations between body and air temperatures from 60 populations;and(iii)a multimodel inference of thermoregulation effectiveness indices from 45 *** importance of different factors,including body size,habitat,insularity,altitude,climate and season,was evaluated in all analyses to model the response variables.A strong seasonality effect was observed,with a consistent pattern of less effective thermoregulation in summer compared to other *** was the second most important factor,with a consistent higher thermoregulation effort in populations occurring at high elevations(>1000 m above sea level).Other factors,such as insularity or body size,can also be important,but did not exhibit a clear ***,thermoregulation was less affected by climate and habitat type.

关键词： lizards meta-analysis seasonality temperature thermoregulation

Is X(3872) a bound state?

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 2019年第12期43卷 115-120页

作者： Pablo G.ortega Enrique Ruiz Arriola Grupo de Fisica Nuclear and Instituto Universitario de Fisica Fundamental y Matematicas(IUFFyM) Universidad de SalamancaE-37008 SalamancaSpain Departamento de Fisica Atomica Molecular y Nuclear and Instituto Carlos I de Fisica Teorica y ComputacionalUniversidad de GranadaE-18071 GranadaSpain

All existing experimental evidence for the bound state nature of X(3872)relies on observing its decay products,which are measured with a finite experimental mass resolution that is typically△m≥2 MeV,and much larger than its alleged binding energy,BX=0.00(18)*** the other hand,we have found recently that there is a clear cancellation in the 1^++channel of the invariant DD^*mass around the threshold between continuum and the bound *** is very much like a similar cancellation in the proton-neutron continuum with the deuteron in the 1^++*** on comparative fits with a common Tsallis distribution of the experimental cross-sections for prompt production of deuterons and X(3872)in pp collisions with a finite pT,we find a strong argument for questioning the bound state nature of this state,which also suggests that the large observed production rate could be consistent with a half-bound state.

关键词： charmonium molecular states particle production Tsallis distribution

Evidences of hydroxytyrosol as an anti-inflammatory agent in Parkinson’s disease:insights into the mechanisms of action

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第5期16卷 992-993页

作者： Ruth Hornedo-ortega Ana María Espinosa-Oliva Axe Molécules d’Intérêt Biologique(MIB) Unitéde Recherche OenologieEA4577USC 1366 INRAISVVUniversitéde BordeauxBordeauxFrance Departamento de Bioquímica y Biología Molecular Facultad de FarmaciaUniversidad de Sevillaand Instituto de Biomedicina de Sevilla(IBiS)Hospital Universitario Virgen del Rocío/CSICSevilleSpain

Neuroinflammation in neurodegenerative diseases:Inflammatory processes play a critical role in neurodegenerative diseases,such as Parkinson’s disease(PD).Thus,neuroinflammation is involved in the progression and development of these diseases,becoming an important pathological *** cells,the“macrophages”from central nervous system,are the initiating cells of the innate immune response against different stimuli in the brain.

关键词： inflammation diseases insight

Regional- to local-scale controls on waterfalls in Rocky Mountain National Park,Colorado

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第8期17卷 1874-1890页

作者： Jose A.ortega-BECERRIL Bridget LIVERS Ellen WOHL Department of Geology and Geochemistry Autonomous University of MadridMadrid.28049Spain Department of Natural Resource Ecology and Management Iowa State UniversityAmesLA 50011 USA Department of Geosciences Colorado State UniversityFort CollinsCO 80523-1482USA

Previous work on the eastern side of Rocky Mountain National Park(RMNP),Colorado indicated correlations among waterfall location,waterfall morphology,and the characteristics of bedrock *** of waterfalls on the western side of the national park do not correlate as strongly with joint *** river profiles on the western side are less concave and waterfalls account for a greater proportion of the total elevation *** interpret these differences to result from more widely spaced joints,lithological differences,and complex glacial *** results demonstrate that waterfall shape and typology may change due to both local and regional controls operating in a mountain *** regions had alpine valley glaciers,but continued landscape evolution via fluvial erosion has developed waterfalls with diverse locations and morphologies that reflect the influences of glacial deposits,bedrock erosional resistance,and joint geometry.

关键词： Waterfall Rocky Mountain National Park Knickpoint Bedrock Mountain stream regional-scale controls

The computerized LASSI-BC Test versus the Standard LASSI-L Paper-and-Pencil Version in Community-Based-Samples

在线全文

学校读者我要写书评

暂无评论

Advances in Alzheimer's Disease 2024年第1期13卷 11-25页

作者： Rosie E. Curiel Cid Alexandra ortega Ubbo Visser Marcela Kitaigorodsky D. Diane Zheng Diana Hincapie Kirsten Horne Crenshaw Ashleigh Beaulieu Brooke Bosworth Liz Gallardo Emory Neer Sofia Ramirez Elizabeth A. Crocco Mike Georgiou Efrosyni Sfakianaki David A. Loewenstein Center for Cognitive Neuroscience and Aging and Department of Psychiatry and Behavioral Sciences Miller School of Medicine University of Miami Miami FL USA Department of Computer Sciences University of Miami Coral Gables FL USA Nova Southeastern University Fort Lauderdale FL USA Department of Radiology and Nuclear Medicine Miller School of Medicine University of Miami Miami FL USA

Proactive Semantic Interference (PSI) and failure to recover from PSI (frPSI), are novel constructs assessed by the LASSI-L. These measures are sensitive to cognitive changes in early Mild Cognitive Impairment (MCI) and preclinical AD determined by Aβ load using PET. The goal of this study was to compare a new computerized version of the LASSI-L (LASSI-Brief Computerized) to the standard paper-and-pencil version of the test. In this study, we examined 110 cognitively unimpaired (CU) older adults and 79 with amnestic MCI (aMCI) who were administered the paper-and-pencil form of the LASSI-L. Their performance was compared with 62 CU older adults and 52 aMCI participants examined using the LASSI-BC. After adjustment for covariates (degree of initial learning, sex, education, and language of evaluation) both the standard and computerized versions distinguished between aMCI and CU participants. The performance of CU and aMCI groups using either form was relatively commensurate. Importantly, an optimal combination of Cued B2 recall and Cued B1 intrusions on the LASSI-BC yielded an area under the ROC curve of .927, a sensitivity of 92.3% and specificity of 88.1%, relative to an area under the ROC curve of .815, a sensitivity of 72.5%, and a specificity of 79.1% obtained for the paper-and-pencil LASSI-L. Overall, the LASSI-BC was comparable, and in some ways, superior to the paper-and-pencil LASSI-L. Advantages of the LASSI-BC include a more standardized administration, suitability for remote assessment, and an automated scoring mechanism that can be verified by a built-in audio recording of responses.

关键词： Mild Cognitive Impairment Proactive Semantic Interference LASSI-L Computerized Cognitive Assessment

Reinforcement of Thermoplastic Starch Films with Cellulose Fibres Obtained from Rice and Coffee Husks

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 Renewable Materials 2018年第6期6卷 599-610页

作者： Sofía Collazo-Bigliardi Rodrigo ortega-Toro Amparo Chiralt Boix Instituto de Ingeniería de Alimentos para el Desarrollo Universitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain Programa de Ingeniería de Alimentos Facultad de IngenieríaUniversidad de CartagenaCarrera 6#36-100Cartagena de Indias D.T y CColombia

Cellulosic fibres from coffee(CF)and rice(RF)husks have been obtained applying chemical treatments and characterized as to their microstructure and thermal *** materials have been incorporated into glycerol plasticised thermoplastic starch(TPS)films obtained by melt blending and compression moulding at 1 wt%,5 wt%and 10 wt%.Microstructure,thermal behaviour and optical,tensile and barrier properties of the composites were *** kinds of micro-fibres improve the film stiffness while reduced the film ***,CF better maintained the film ductility at 1 and 5 wt%.A network of fine oriented fibres was observed on the surface of the films,while internal fibres exhibited a good adherence to the polymer *** water vapour permeability of TPS films was not reduced in composites,although oxygen permeability was lowered by about 17%.Film transparency decreased by fibre addition in the UVVIS *** stability of composites was slightly higher than net TPS films.

关键词： Cellulose fibres coffee husk reinforcing properties rice husk starch composites

True grit: ingestion of small stone particles by hummingbirds in West Mexico

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4期12卷 739-749页

作者： Omar Maya-García Mauricio ortega-Flores Jorge E.Schondube Posgrado en Ciencias Biológicas Unidad de PosgradoCoordinación del Posgrado en Ciencias BiológicasUniversidad Nacional Autónoma de MéxicoEdificio D1er pisoCircuito de PosgradosCiudad UniversitariaDel.CoyoacánC.P.04510 México D.F.Mexico Laboratorio de Ecología Funcional Instituto de Investigaciones en Ecosistemas y SustentabilidadUniversidad Nacional Autónoma de MéxicoAntigua Carretera a Pátzcuaro No.8701Col.Ex Hacienda de San Joséde la HuertaC.P.58190 MoreliaMichoacánMexico

Background: Grit is used by birds mainly for grinding hard food items but can also serve a nutritional role as a source of minerals. Ingestion of grit by birds has been documented primarily in species that feed on seeds and *** feeding mainly on nectar and small arthropods, hummingbirds also ingest grit, but why they do so is unclear. We quantified the number of grit particles in the stomachs of six species of hummingbirds during an annual cycle in a seasonal ecosystem of West ***: We compared the number of grit particles in the stomachs of different hummingbird species(Mexican Violetear Colibri thalassinus, Amethyst-throated Mountaingem Lampornis amethystinus, White-eared Hummingbird Basilinna leucotis, Rivoli's Hummingbird Eugenes fulgens, Broad-tailed Hummingbird Selasphorus platycercus, and Rufous Hummingbird S. rufus), and between sex and age categories during the different seasons of a year. To deter-mine if grit was used to grind ingested arthropods, we examined the relationships between the number of grit parti-cles, the biomass of arthropods ingested, and their chitin ***: Although species did not differ in the number of grit particles in their stomachs, we found that grit was mostly ingested by female individuals, with only one male of one species(Mexican Violetear) presenting grit in its stomach. We also found that female hummingbirds had grit in their stomachs during the rainy and the cold-dry season(June-February) but not during the warm-dry season(March-May). Our analyses revealed no relationship between the number of grit particles and the amount of ingested arthropods and arthropod chitin content. However,high grit consumption was related to wasp ingestion on Mexican ***: Our results indicate that grit is used mainly by female hummingbirds. The seasonal variation in the ingestion of grit by female individuals suggests that it can be used to meet mineral requirements related to breed-ing;how

关键词： Arthropod chitin content Arthropod digestion Breeding season Mineral nutritional requirements

Photoinactivation of Escherichia coli using five photosensitizers and the same number of photons

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2022年第6期15卷 53-67页

作者： Daniel ortega-Zambrano Denisse Fuentes-López Hilda Mercado-Uribe CINVESTAV-Monterrey Parque PIITAutopista al Aeropuerto km.9.5ApodacaNL 66600Mexico

Bacterial resistance is today a matter of great medical concern,so it is urgent to investigate alternatives to alleviate *** inactivation(PDI)is a method that has been endorsed to inactivate diferent pathogens,including bacteria,fungi and *** is achieved by using a photosensitizer(PS)molecule which generates reactive oxygen species under visible or UV *** use visible light and UV-A radiation to excite four commercial PSs(methylene blue,rose bengal,riboflavin and curcumin),and nanopartides synthesized in our *** these PSs having been thoroughly studied in the past by other research groups,in order to compare their effects in an appropriate way,we matched the number of photons they *** found that methylene blue leads to the major inactivation of Escherichia ***,we evaluated the production of singlet axygen and hydroxyl radicals in the photoinactivation process.

关键词： Photodynamic inactivation E.coli ROS photons