检索结果-南通市图书馆

基于白扦树轮蓝光强度的中国华北暖季温度重建

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 Geographical Sciences 2023年第12期33卷 2511-2529页

作者：陈巧湄岳伟鹏陈峰马丁·哈达德菲德尔·罗伊格赵晓恩胡茂曹红华 Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming650500China Key Laboratory of Tree-ring Physical and Chemical Research of the Chinese Meteorological Administration/Xinjiang Laboratory of Tree-ring Ecology Institute of Desert MeteorologyChinese Meteorological AdministrationUrumqi830002China Laboratorio de Dendrocronología de ZonasÁridas CIGEOBIO(COnICET-UnSJ) Gabinete de Geología Ambiental(INGEO-UNSJ)San JuanArgentina Laboratorio de Dendrocronología e Historia Ambiental IANIGLA-CCT CONICET-Universidad Nacional de CuyoMendozaArgentina Hémera Centro de Observación de la Tierra Escuela de Ingeniería ForestalFacultad de CienciasUniversidad MayorHuechurabaSantiagoChile

In the past 30 years,observational climate datasets reveal a significant a drying and warming trend over in north *** of climatic variability over north China and its driving mechanism in a long-term perspective is,however,limited to a few sites only,especially the lack of temperature reconstructions based on latewood density and blue *** this study,we developed a 281-year latewood blue intensity chronology based on 45 cores of Picea meyeri in western north *** on the discovery that the warm season(May–August)mean maximum temperature is the main controlling factor affecting the change in blue light reflection intensity,we established a regression model that explained 37%of the variance during the calibration period(1950–2020),allowing to trace the mean maximum temperature up to 1760 *** the past 261 years,we identified seven persistent high temperature periods(1760–1773,1778–1796,1805–1814,1869–1880,1889–1934,1984–2000,2004–2020)and three persistent low temperature periods(1815–1868,1935–1963,1969–1983)in north *** of a nearby temperature reconstructions and climate gridded data indicate that our reconstruction record a wide range of temperature variations in north *** analysis of links between large-scale climatic variation and the temperature reconstruction showed that there is a relationship between extremes in the warm season temperature and anomalous SSTs in the equatorial eastern Pacific,and implied that the extremes in the warm season temperature in north China will be intensified under future global warming.

关键词： blue intensity Picea meyeri mean maximum temperature north China dendroclimatology

Detection transposable elements in Botrytis cinerea in latent infection stage from symptomless apples

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Coastal Life Medicine 2014年第2期2卷 125-131页

作者： Jorge G Fernández martín A Fernández-Baldo Claudio Muñoz Eloy Salinas Julio Raba María I sanz Area of Chemistry and Biotechnology Technology Department of ChemistryFaculty of ChemistryBiochemistry and PharmacyNational University of San LuisChacabuco 917D5700BWS San LuisArgentina Inquisal-Conicet Department of ChemistryFaculty of ChemistryBiochemistry and PharmacyNational University of San LuisChacabuco 917D5700BWS San LuisArgentina Laboratory of Plant Virology EEA Mendoza INTASan Martín 3853D5507BWSMendozaArgentina

Objective:To detect Botrytis cinerea(***)latent infections on apples before storage,which is essential for effective control strategies in the fruit postharvest ***:In the present study,a polymerase chain reaction detection method,based on primers designed on *** transposable elements(boty and flipper)and intergenic spacer region as internal control,were utilized to reveal the presence of symptomless infections on apple *** molecular method proved to be highly specific and sensitive in detecting latent *** revealed the presence of the pathogen in 83%of the samples from infected apples with 104 conidia/mL,whereas those infected with 106 conidia/mL detected 94%as compared to the traditional method that revealed the pathogen in 40%and 66%of the samples inoculated with 10^(4)and 10^(6)conidia/mL ***,the method characterized *** as subpopulation transposa-type by the presence of the transposable elements boty and flipper Results:The results obtained from DnA quantification method were compared with enzyme-linked immunosorbent assay and these studies showed good *** our method has important advantages compared with others detection methods for ***,because the proposed methodology allowed distinguishes between its two subpopulations(vacuma and transposa)and this would allow establish possible appropriate control ***:Finally,the method can be an interesting alternative for its possible application in the phytosanitary programs of the fruit industry worldwide.

关键词： Botrytis cinerea Latent infection Transposable elements Boty and flipper Symptomless apples

Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe2O3) nanocrystalline Powder

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 nanoparticles 2014年第3期3卷 114-121页

作者： Juan Adrián Ramos Guivar Arturo Isaías martínez Ana Osorio Anaya Luis De Los santos Valladares Lizbet León Félix Angel Bustamante Dominguez Cavendish Laboratory Department of Physics University of Cambridge Cambridge UK Centro de Investigación y Estudios Avanzados del Instituto Politécnico nacional Cinvestav Unidad Saltillo Ciudad de México México Ciudad de México México Laboratorio de Cerámicos y nanomateriales Facultad de Ciencias Físicas Universidad Nacional Mayor de San Marcos Lima Perú Laboratorio de nanotecnología e Innovación Tecnológica Departamento de Química e Ingeniería Química Universidad Nacional Mayor de San Marcos Lima Perú núcleo de Física Aplicada Instituto de Física Universidade de Brasília Brasília Brasil

Structural and magnetic studies of monophasic maghemite (γ-Fe2O3) magnetic nanocrystallites (MnCs) synthesized by the co-precipitation chemical route are reported in this paper. For the synthesis, a starting precursor of magnetite (Fe3O4) in basic medium was oxidized at room temperature by adjusting the pH = 3.5 at 80°C in an acidic medium without surfactants. X-ray diffraction (XRD) pattern shows widened peaks indicating nanometric size and Rietveld Refinement confirms only one single-phase assigned to γ-Fe2O3 MnCs. High Resolution Transmission Electron Microscopy (HR-TEM) demonstrates the formation of nanoparticles with diameter around D ≈ 6.8 ± 0.1 nm which is in good agreement with Rietveld Refinement (6.4 ± 1 nm). A selected area electron diffraction pattern was carried out to complement the study of the crystalline structure of the γ-Fe2O3 MnCs. M(H) measurements taken at different temperatures show almost zero coercivity and remanence indicating superparamagnetic domain and high magnetic saturation.

关键词： Monophasic nanomaghemite Rietveld Refinement TEM SAED M-H Loops ZFC

Cadaveric bone marrow mesenchymal stem cells:first experience treating a patient with large severe burns

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Burns & Trauma 2015年第2期3卷 74-82页

作者： Eduardo Mansilla Gustavo H.Marín Mirta Berges Silvia Scafatti Jaime Rivas Andrea núñez martin Menvielle roberto Lamonega Cecilia Gardiner Hugo Drago Flavio Sturla Mercedes Portas Silvia Bossi Maria Victoria Castuma sandra Peña Luengas Gustavo Roque Karina martire Jose Maria Tau Gabriel Orlandi Adrian Tarditti Tissue Engineering Regenerative Medicine and Cell Therapies LaboratoryCUCAIBAProvince of Buenos Aires Ministry of HealthTransplantation ProgramLa PlataProvince of Buenos AiresArgentina Burns and Plastic Surgery Department San Martín HospitalProvince of Buenos Aires Ministry of HealthLa PlataProvince of Buenos AiresArgentina Burns Hospital Buenos Aires CityArgentina Department of Chemistry Mayaguez CampusUniversity of Puerto RicoMayaguezPuerto RicoUSA.

Background:In January 2005,Rasulov et *** published"First experience in the use of bone marrow mesenchymal stem cells(MSCs)for the treatment of a patient with deep skin burns".Here,we present the first ever treated patient with cadaveric bone marrow mesenchymal stem cells(CMSCs)in the history of ***:A young man,who severely burned 60%of his total body surface with 30%of full-thickness burns while working with a grass trimmer that exploded,was involved in the *** were obtained from the bone marrow of a cadaver donor in a routine procurement procedure of CUCAIBA,the Province of Buenos Aires,Argentina,Ministry of Health,Transplantation Agency,cultured,expanded,and applied on the burned surfaces using a fibrin spray after early ***:So far,our preliminary experience and our early results have been very impressive showing an outstanding safety data as well as some impressive good results in the use of ***:Based on al this,we think that improvements in the use of stem cells for burns might be possible in the near future and a lot of time as well as many lives could be saved by many other research teams all over the *** will probably be a real scientific opportunity in Regenerative Medicine as well as in Transplantation.

关键词： Burns Cadaveric Transplantation Skin regeneration Mesenchymal stem cells

Improving the Performance of Fixed-Bed Catalytic Reactors by Innovative Catalyst Distribution

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 Applied Mathematics and Physics 2020年第4期8卷 672-683页

作者： Violeta Alejandra Chichique martínez Farhang Shadman Department of Chemical and Environmental Engineering University of Arizona Tucson AZ USA Departamento de Ingeniería de Procesos y Ciencias Ambientales Universidad Centroamericana “José Simeón Cañas” (UCA) San Salvador El Salvador

A comprehensive mathematical model is developed to simulate the interactions of the complex processes that take place in typical catalytic chemical reactors. This mathematical model includes correlations representing various modes of mass transport and chemical reactions. To illustrate the application and value of this approach for reactor optimizations, the model is applied to the case of series reactions with a desirable intermediate compound and the risk of degradation of this compound if the process conditions are not optimized. The modeling results show that in such cases, which are very common in practice, replacing the conventional uniform catalyst distribution with a novel non-uniform distribution will significantly improve the performance of the reactor and the production of the desirable compound. Various catalyst distribution options are compared, and a novel non-uniform loading of catalyst is identified that gives a much better performance compared to the conventional approach. The model is versatile and useful for both the design as well as the optimization of the catalytic fixed-bed reactors in a wide variety of reactor and reaction conditions.

关键词： Catalyst Reactor Optimization Series Reactions Uniform Catalyst Distribution non-Uniform Catalyst Distribution Catalyst Deactivation

High pressure effects on the excitation spectra and dipole properties of Li, Be+, and B2+ atoms under confinement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2020年第2期5卷 43-52页

作者： C.martinez-Flores R.Cabrera-Trujillo Departamento de Qu´ımica Universidad Aut´onoma Metropolitana IztapalapaSan Rafael Atlixco 186Col.VicentinaIztapalapaC.P.09340 M´exico D.F.Mexico Instituto de Ciencias F´ısicas Universidad Nacional Aut´onoma de M´exicoAp.Postal 43-8CuernavacaMorelos62251Mexico Theoretische Chemie Physikalisch-Chemisches InstitutUniversit¨at HeidelbergINF 22969120 HeidelbergGermany

Properties of atoms and molecules undergo significant changes when subjected to spatial *** study the excitation spectra of lithiumlike atoms in the initial 1s22s electronic configuration when confined by an impenetrable spherical *** implement Slater’s X-αmethod in Hartree–Fock theory to obtain the excitation *** that as the cavity size decreases,the total,2s,2p,and higher excited energy levels ***,we confirm the existence of crossing points between ns–np states for low values of the confinement radius such that the ns→np dipole transition becomes zero at that critical *** crossing points of the s–p states imply that instead of photon absorption,one observes photon emission for cavities with radius smaller than the critical ***,the dipole oscillator strength associated with the 2s→2p transition becomes negative,and for higher pressures,the 2s→3p dipole oscillator strength transition becomes larger than *** validate the completeness of the spectrum by calculating the Thomas–Reiche–Kuhn sum rule,as well as the static dipole polarizability and mean excitation energy of lithium-like *** find that the static dipole polarizability decreases and exhibits a sudden change at the critical pressure for the absorption-to-emission *** mean excitation energy increases as the pressure ***,as a consequence of the critical transition fromabsorption to emission,themean excitation energy becomes undetermined for higher pressures,with implications formaterial damage under extreme *** unconfined systems,our results show good to excellent agreement with data found in the literature.

关键词： transition. excitation dipole

Medicinal plants and natural products as neuroprotective agents in age-related macular degeneration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

neural Regeneration Research 2020年第12期15卷 2207-2216页

作者： Francisco Bosch-Morell Victoria Villagrasa Teresa Ortega nuria Acero Dolores Muñoz-Mingarro MEugenia González-Rosende Encarna Castillo MAmparo sanahuja Pilar Soriano Isabel martínez-Solís Biomedical Sciences Institute Universidad Cardenal Herrera-CEUCEU UniversitiesAlfara del PatriarcaValenciaSpain Department of Biomedical Sciences Faculty of Health SciencesUniversidad Cardenal Herrera-CEUCEU UniversitiesAlfara del PatriarcaValenciaSpain Department of Pharmacy Faculty of Health SciencesUniversidad Cardenal Herrera-CEUCEU UniversitiesAlfara del PatriarcaValenciaSpain Department of Pharmacology Pharmacognosy and BotanyUniversidad Complutense de MadridMadridSpain Department of Pharmaceutical and Health Sciences Faculty of PharmacyUniversidad San Pablo-CEUCEU UniversitiesMadridSpain Department of Chemistry and Biochemistry Faculty of PharmacyUniversidad San Pablo-CEUCEU UniversitiesMadridSpain ICBiBE-Botanical Garden University of ValenciaValenciaSpain

The retina may suffer neurodegenerative damages,as other tissues of the central nervous system do,and serious eye diseases may *** of them is age-related macular degeneration,which causes progressive loss of vision due to retina *** of age-related macular degeneration focuses on antioxidant agents and anti-vascular endothelial growth factor compounds,among others,that prevent/diminish oxidative stress and reduce neovascularisation *** phytochemicals,medicinal plants and/or plant-diet supplements might be a useful adjunct in prevention or treatment of age-related macular degeneration owing to their antioxidant and anti-vascular endothelial growth factor *** review article presents the most investigated plants and natural products in relation to age-related macular degeneration,such as saffron,ginkgo,bilberry and blueberry,curcuma or turmeric,carotenoids,polyphenols,and vitamins C and *** study provides up-to-date information on the effects,treatments,safety and efficiency of these phytotherapy products.

关键词： age-related macular degeneration bilberry blueberry curcuma carotenoids ginkgo polyphenols saffron vitamins

The Potentiality of non Timber Forest Products. Fruit Availability, Phytochemical Properties of Rosa rubiginosa L. Rose Hips

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2016年第15期7卷 2272-2287页

作者： Gerardo U. Aguirre martín Loza José Gasquez María Fusco Angela Sosa Gladys M. Ciuffo Liliana E. C. Ciuffo Ecología y Conservación Facultad de Química Bioquímica y Farmacia Universidad Nacional de San Luis San Luis Argentina UnSL/FQBF/Química Analítica Ejército de los Andes San Luis Argentina UnSL/FQBF/Farmacognosia Ejército de los Andes San Luis Argentina UnSL/FQBF/Bioquímica Avanzada Ejército de los Andes San Luis Argentina IMIBIO/COnICET Ejército de los Andes San Luis Argentina

We evaluated fruit availability, phytochemical characteristics and mineral content of R. rubiginosa L. rose hips, at two experimental sites in san Luis province: Potrero de los Funes-El Volcán (PF-V) and Estancia Grande (EG). Plant density was 70 plants/ha (1 ha = 10,000 m2) in PF-V and 50 plants/ha in EG. Fruit availability (DF) in fresh fruits (FF) was 4.39 kg (PF-V) and 3.10 kg (EG) during March, and decreased during June. Ascorbic acid in FF increased during ripening period, peaking on late April, early May, and diminished 75% - 85% in dried fruits. Total soluble solids in FF ranged from 32.55 to 55.20 °Brix. Elements Ba, Ca, Fe, K, Zn and Cu, determined by inductively coupled plasma optical emission spectrometry (ICP-OES), were significant for human health. Dried fruits maintain a high level of ascorbic acid, a characteristic added to content of mineral elements, particularly calcium content, providing an important nutritional value to R. rubiginosa rose hips.

关键词： Rosa rubiginosa Rose Hips Fruit Chemical Contents Ascorbic Acid Mineral Elements

non-Communicable Chronic Diseases and Structural Indicators in an Epidemiological Transition Country

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Epidemiology 2020年第1期10卷 32-42页

作者： natalia Romero-sandoval S. Ramiro Canelos Héctor Javier Sánchez-Pérez Ricardo Romero Fernando Cornejo Miguel martín-Mateo Escuela de Medicina Facultad de Ciencias Médicas de la Salud y de la Vida Universidad Internacional del Ecuador Quito Ecuador Grups de Reserca d’Amèrica i àfrica Llatines-GRAAL Cerdanyola del Vallés España Facultad de Ciencias Administrativas Universidad Internacional del Ecuador Quito Ecuador El Colegio de la Frontera Sur-ECOSUR San Cristóbal de Las Casas Chiapas México Instituto Geográfico Militar Seniergues E4-676 y Gral. Telmo Paz y Miño Quito Ecuador Facultad de Medicina Universidad Tecnológica Equinoccial Bourgeois Quito Ecuador Unidad de Bioestadística Facultad de Medicina Universidad Autónoma de Barcelona Cerdanyola del Vallés Barcelona Spain

Objective: To determine associations between standardized prevalence ratios of Metabolic Syndrome (MS), High Blood Pressure (HBP), and Obesity (O) with structural factors in ecuadorian population aged 20 to 59. Methods: An ecological study was conducted through data from the Ecuador’s national Health and nutrition Survey 2013-2014, and national Census. Standardized prevalence ratio (SPR) variability was analyzed with Poisson multiple regression models (adjusted Relative Risk). Results: The SPR variability for the three diseases was associated with non-affiliation to social security, and inversely related to lower urbanization. HBP and O were associated with functional illiteracy and higher rates of primary care physicians/1000 inhabitants. HBP and MS were related to poor housing. Conclusions: Policies of non-communicable chronic diseases control in ecological transition countries need to take structural variations into account.

关键词： Chronic Illness Social Inequality Statistical Analysis Policy Process Ecuador