检索结果-南通市图书馆

Journal of Pharmaceutical Analysis 2021年第5期11卷 646-652页

作者： Elsa Maria Materon Ademar Wong Tayane Aguiar Freitas Ronaldo Censi Faria Osvaldo N.Oliveira Jr. department of Chemistry Federal University of Sao Carlos13560-970Sao CarlosBrazil sao carlos Institute of Physics University of Sao Paulo13560-970Sao CarlosBrazil

Monitoring the concentration of antibiotics in body fluids is essential to optimizing the therapy and minimizing the risk of bacteria resistance,which can be made with electrochemical sensors tailored with appropriate *** this paper,we report on sensors made with screen-printed electrodes(SPE)coated with fullerene(C60),reduced graphene oxide(rGO)and Nafion(NF)(C60-rGO-NF/SPE)to determine the antibiotic metronidazole(MTZ).Under optimized conditions,the C60-rGO-NF/SPE sensor exhibited a linear response in square wave voltammetry for MTZ concentrations from 2.5×10^(-7) to 34×10^(-6) mol/L,with a detection limit of 2.1×10^(-7) mol/*** sensor was also capable of detecting MTZ in serum and urine,with recovery between 94%and 100%,which are similar to those of the standard chromatographic method(HPLC-UV).Because the C60-rGO-NF/SPE sensor is amenable to mass production and allows for MTZ determination with simple principles of detection,it fulfills the requirements of therapeutic drug monitoring programs.

关键词： Metronidazole Fullerene Reduced graphene oxide Screen-printed electrodes Antibiotic

A large epeiric methanogenic Bambuí sea in the core of Gondwana supercontinent?

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第1期12卷 203-218页

作者： Sergio Caetano-Filho Pierre Sansjofre Magali Ader Gustavo M.Paula-Santos Cristian Guacaneme Marly Babinski Carolina Bedoya-Rueda Matheus Kuchenbecker Humberto L.S.Reis Ricardo I.F.Trindade Universidade de sao Paulo Instituto de GeocienciasRua do Lago562-Sao Paulo05508-080Brazil MNHN Sorbonne UniversiteCNRS UMR 7590Institut de Mineralogiede Physique des Materiaux et de Cosmochimie75005ParisFrance Universite de Paris Institut de Physique du Globe de ParisCNRSF-75005ParisFrance Universidade Estadual de Campinas Instituto de GeocienciasRua Carlos Gomes250-Campinas13083-855Brazil Universidade Federal dos Vales do Jequitinhonha e Mucuri Instituto de Ciencia e TecnologiaLaboratorio de Estudos TectonicosRodovia MGT 367Km 583-Diamantina39100-000Brazil Universidade Federal de Ouro Preto Departamento de Geologia-Escola de MinasLaboratiorio de Modelagem TectonicaCampus Morro do Cruzeiro-Ouro Preto35400-000Brazil Universidade de sao Paulo Instituto de AstronomiaGeofísica e Ciencias AtmosfericasRua do Matao1226-Sao Paulo05508-090Brazil

Carbon isotope compositions of both sedimentary carbonate and organic matter can be used as key proxies of the global carbon cycle and of its evolution through time,as long as they are acquired from waters where the dissolved inorganic carbon(DIC)is in isotope equilibrium with the atmospheric ***,in shallow water platforms and epeiric settings,the influence of local to regional parameters on carbon cycling may lead to DIG isotope variations unrelated to the global carbon *** may be especially true for the terminal Neoproterozoic,when Gondwana assembly isolated waters masses from the global ocean,and extreme positive and negative carbon isotope excursions are recorded,potentially decoupled from global *** improve our understanding on the type of information recorded by these excursions,we investigate the pairedδ^13Ccarb andδ^13Corg evolution for an increasingly restricted late Ediacaran-Cambrian foreland system in the West Gondwana interior:the basal Bambui *** succession represents a 1~(st)-order sedimentary sequence and records two majorδ^13Ccarb excursions in its two lowermost lower-rank *** basal cap carbonate interval at the base of the first sequence,deposited when the basin was connected to the ocean,hosts antithetical negative and positive excursions forδ^13Ccarb andδ^13Corg,respectively,resulting inΔ^13C values lower than 25‰.From the top of the basal sequence upwards,an extremely positiveδ^13Ccarb excursion is coupled toδ^13Corg,reaching values of+14‰and-14‰,*** positive excursion represents a remarkable basin-wide carbon isotope feature of the Bambui Group that occurs with only minor changes inΔ^13C values,suggesting change in the DIC isotope *** argue that this regional isotopic excursion is related to a disconnection between the intrabasinal and the global carbon *** extreme carbon isotope excursion may have been a product of a disequilibria between the basin DIC and atmospheric CO2

关键词： Methanogenesis Ediacaran Cambrian Carbon isotopes sao Francisco Basin Bambui Group

Laplace-Beltrami Differentiability of Positive definite Kernels on the Sphere

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第1期29卷 93-104页

作者： M. H. CASTRO V. A. MENEGATTO C. P. OLIVEIRA Faculdade de Matemática Universidade Federal de UberladiaCaixa Postal 593 38400-902 Uberlandia MG Brasil departamento de Matemática ICMC-USPSao CarlosCaixa Postal 668 13560-970 Sao Carlos SP Brasil ICE-DMC Universidade Federal de Itajubá37500-903 Itajubá MG Brasil

This contribution gives results on the action of the Laplace-Beltrami derivative on suffi- ciently smooth kernels on the sphere, those defined by absolutely and uniformly expansions generated by a family of at least continuous functions. Among other things, the results show that convenient Laplace-Beltrami derivatives of positive definite kernels on the sphere are positive definite too. We also include similar results on the action of the Laplace-Beltrami derivative on condensed spherical harmonic expansions.

关键词： Sphere Laplace-Beltrami operator Laplace-Beltrami derivative positive definite kernels,spherical harmonics

Luminescent polymer electrolytes based on chitosan and containing europium triflate

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2016年第7期34卷 661-666页

作者： R.Alves A.S.S.de Camargo A.Pawlicka M.M.Silva Center of Chemistry University of MinhoGualtar4710-057 BragaPortugal sao carlos Institute of Physics University of Sao Paulo13566-590 Sao Carlos-SPBrazil sao carlos Institute of Chemistry University of Sao Paulo13566-590 Sao Carlos-SPBrazil

Solid polymer electrolytes based on chitosan and europium triflate were prepared by solvent casting and characterized by X-ray diffraction, scanning electron microscopy （SEM）, atomic force microscopy （AFM）, and photoluminescence spectroscopy. The X-ray diffraction exhibited that the samples were essentially amorphous with organized regions over the whole range of the salt content studied. The AFM analysis demonstrated that the smoother sample had roughness of 4.39 nm. Surface visualization through SEM revealed good homogeneity without any phase separation for more conductive samples and the less conductive showed some im- perfections on the surface. The emission and excitation spectra displayed the characteristic bands of Eu（CF3SO3）3 in addition to broad bands corresponding to the polymer host. The excited state 5D0 lifetime values ranged from 0.29-0.37 ms for the studied samples.

关键词： solid polymer electrolytes natural polymers photoluminescence spectroscopy rare earths

The Integration of Circular Economy and Impact Assessment: A Bibliometric Analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2024年第4期13卷 136-150页

作者： Marina Morhy Pereira Marcelo Montaño São carlos School of Engineering University of São PauloSão Carlos-SP 13563-120Brazil

In spite of the proximity between“CE(Circular Economy)”and“sustainability”,it is relevant to consider that a circular strategy is not inherently sustainable or free from significant environmental and social ***,assessing the impacts of CE initiatives and the promotion of circularity in development projects submitted to IA(Impact Assessment)processes are crucial,though the relationship between both fields has not been yet systematically ***,the present paper is focused on the identification of the links between IA and CE,based on the application of bibliometric techniques and Content *** outcomes revealed three thematic clusters in which significant overlaps were found:the 1st revealed LCA(Life Cycle Assessments)as the most used IA technique to assess the impacts of CE strategies,the 2nd encompasses climate change and environmental issues,and the 3rd cluster revealed that the integration of sustainability is the most frequent objective linking IA and CE,though characterized by different *** findings allow concluding that IA fosters the transition to CE by assessing the impacts of circular initiatives and CE strategies can improve IA practice by making it more effective.

关键词： IA CE sustainability bibliometric analysis

Brazilian payment for environmental services programs emphasize water-related services

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 Soil and Water Conservation Research 2023年第2期11卷 276-289页

作者： Ingrid Mamedes Angélica Guerra Dulce B.B.Rodrigues Letícia Couto Garcia Raquel de Faria Godoi Paulo Tarso S.Oliveira Faculty of Engineering Architecture and Urbanism and GeographyFederal University of Mato Grosso do SulMS79070-900Brazil Programa de Pós-Graduaçāo em Ecologia e Conservaaçāo Universidade Federal de Mato Grosso do SulCampo GrandeBrazil Laboratorio de Ecologia da Intervenaçāo-LEl Instituto de BiociênciasUniversidade Federal de Mato Grosso do SulCampo GrandeBrazil department of Hydraulics and Sanitary Engineering Sao Carlos School of EngineeringUniversity of Sao PauloSao CarlosSPBrazil

Based on"user pays"and"provider gets"principles,the Payment for Environmental Services(PES)consists of providing economic incentives or compensation for land users who adopt activities that promote ecosystem *** PES initiatives have grown rapidly in Brazil over the last few decades,however,studies that address the panorama of these programs in the country are still scarce,regional,or ***,we investigate the PES overview in Brazil through interviews and an extensive literature *** found in total 80 PES programs implemented in Brazil,of which 14 were *** pro-grams are poorly distributed across the country,mostly concentrated in the Atlantic Forest(56.25%)and Savanna(36.25%)biomes,in Southeastern *** majority of programs primarily prioritize improving water quality and ***,reforestation,protection of native vegetation,and soil and water conservation are their main proposed *** positive impacts of Brazil's PES experi-ences are evident;while the lack of transparency and monitoring,and poor spatial and financial dis-tribution are still major *** conclude that if correctly implemented,PES schemes offer a path to reconcile environmental conservation with agricultural production in Brazil.

关键词： Conservation funding Ecological restoration Environmental compliance Public policy Soil and water conservation

Selection signatures in Canchim beef cattle

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 Animal Science and Biotechnology 2017年第1期8卷 15-23页

作者： Ismael Urbinati Nedenia Bonvino Stafuzza Marcos Túlio Oliveira Tatiane Cristina Seleguim Chud Roberto Hiroshi Higa Luciana Correia de Almeida Regitano Maurício Mello de Alencar Marcos Eli Buzanskas Danísio Prado Munari departamento de Ciencias Exatas Univ Estadual PaulistaFaculdade de Ciencias Agrairias e VeterinairiasjaboticabalSao Paulo 14884-900Brazil departamento de Tecnologia UNESP-Univ Estadual PaulistaFaculdade de Ciencias Agrarias e VeterinariasJaboticabalSao Paulo 14884-900Brazil Embrapa Agricultural Informatics CampinasSao Paulo 13083-886Brazil Embrapa Southeast Livestock Sao CarlosSao Paulo 13560-970Brazil

Background： Recent technological advances in genomics have allowed the genotyping of cattle through single nucleotide polymorphism（SNP） panels. High-density SNP panels possess greater genome coverage and are useful for the identification of conserved regions of the genome due to selection, known as selection signatures（SS）. The SS are detectable by different methods, such as the extended haplotype homozygosity（EHH）; and the integrated haplotype score（i HS）, which is derived from the EHH. The aim of this study was to identify SS regions in Canchim cattle（composite breed）, genotyped with high-density SNP ***： A total of 687,655 SNP markers and 396 samples remained for SS analysis after the genotype quality control. The i HS statistic for each marker was transformed into pi HS for better interpretation of the *** BTA5 and BTA14 showed pi HS 〉 5, with 39 and nine statistically significant SNPs（P 〈 0.00001）,respectively. For the candidate selection regions, i HS values were computed across the genome and averaged within non-overlapping windows of 500 Kb. We have identified genes that play an important role in metabolism,melanin biosynthesis（pigmentation）, and embryonic and bone ***： The observation of SS indicates that the selection processes performed in Canchim, as well as in the founder breeds（i.e. Charolais）, are maintaining specific genomic regions, particularly on BTA5 and BTA14. These selection signatures regions could be associated with Canchim characterization.

关键词： Composite breed Extended haplotype homozygosity Genomics Single nucleotide polymorphism

Rigid foam polyurethane （PU） derived from castor oil （Ricinus communis） for thermal insulation in roof systems

在线全文

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2012年第4期1卷 348-356页

作者： Grace Tiberio Cardoso Salvador Claro Neto Francisco Vecchia Engineering School of sao carlos University of Sao Paulo Sao Carlos Brazil Chemistry Institute of sao carlos University of Sao Paulo Sao Carlos Brazil

This paper discusses the response of the thermal insulation Lining of rigid foam potyurethane （PU） derived from castor oil （Ricinus communis） in heat conditions, based on dynamic climate approach. Liners have been widely used, because the coverage of buildings is responsible for the greatest absorption of heat by radiation, but the use of PU foam deMved from this vegetal oil is unprecedented and has the advantage of being biodegradable and renewable. The hot wire paraLleL method provided the thermal conductivity vatue of the foam. The thermo- gravimetric analysis enabled the study of the foam decomposition and its Lifetime by kinetic evaLuation that involves the decomposition process. The PU foam thermal behavior analysis was performed by coLlecting experimental data of internal surface temperature measured by thermocouples and assessed by representative episode of the climatic fact. The results Lead to the conclusion that the PU foamderived from castor oit can be applied to thermat insulation of roof systems and is an environmentaLLy friendly materiaL.

关键词： Rigid foampolyurethane Ricinus communis Biodegradable Thermal behavior Heat insulation in roofsystems

The Use of Solid State NMR to Evaluate the Carbohydrates in Commercial Coffee Granules

在线全文

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2011年第4期2卷 350-355页

作者： Regina Freitas Nogueira Elisangela Fabiana Boffo Maria Inês Bruno Tavares Leonardo AMoreira Leila Aley Tavares Antonio Gilberto Ferreira departamento de química da Universidade Federal de Sao CarlosSao CarlosBrasil Institutito de Macromoléculas Universidade Federal do Rio de JaneiroRio de JaneiroBrasil Escola Técnica Federal de Minas GeraisBrasil

Coffee brings many health benefits due to its chemical constituents. Based on this information, it is essential to know the main chemical compounds from coffee granules;the intermolecular interaction among the coffees compounds and the molecular components homogeneity. In this study six types of roasted commercial coffee were evaluated by solid state nuclear magnetic resonance (NMR), employing carbon-13 (13C) and hydrogen (1H) nucleus. Carbon-13 was analyzed applying high field NMR techniques, such as: magic angle spinning (MAS);magic angle spinning with cross-polariza- tion (CPMAS) and magic angle spinning with cross-polarization and dipolar dephasing (CPMASDD). The hydrogen was evaluated via relaxation times. Proton spin-lattice relaxation time in the rotating frame was deter-mined through the carbon-13 decay, during the variable contact-time experiment, using high field NMR. Proton spin-lattice relaxation time was determined through the inversion-recovery pulse sequence, using low field NMR. Considering all NMR results, it was concluded that the major coffee compounds are: a) triacilglycerides, which constitute the mobile region in the granule coffee and b) Carbohydrates such as: polysaccharides and fibers that belong to the rigid domain. These constituents belong to different molecular mobility domain, although they have strong intermolecular interactions due to the granule organization.

关键词： Solid State NMR Coffee

Influence of physical and chemical factors during foraging and culture of the symbiont fungus in Atta sexdens rubropilosa （Hymenoptera： Formicidae）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2007年第4期14卷 295-300页

作者： SANDRA S. VERZA LUIZ C. FORTI JULIANE F. S. LOPES ROBERTO S.CAMARGO carlos A. O. MATOS departamento de Zoologia Instituto de Biociencias Laboratrio de Insetos Sociais-Praga Departamento de Produ~~o Vegetal-Def-esa Fitossanitaria Faculdade de Ciencias Agronomicas UNESP-Sao Paulo State University Fazenda Experimental LageadoBotucatu SP Comportamento e Biologia Animal Instituto de Ciencias Biologicas UFJF-Universidade Federal de Juiz de ForaCampus Universitario Martelos Juiz de Fora MG Campus Experimental de Itapeva UNESP Itapeva SP Brazil

The aim of this paper is to investigate the influence of physical and chemical factors on transport and use of substrate for Atta sexdens rubropilosa workers. Three types of rectangular fragments were used to study the physical influence factors： filter paper with paraffin, filter paper without paraffin and polyester film. To study the chemical factors, some fragments were impregnated with organic extract of orange albedo, others were soaked with soybean oil and for the remaining ones nothing was applied. The fonowing parameters were evaluated：（i） attractiveness of substrate for transport and number of loading workers per treatment; （ii） foraged material incorporation; （iii） rejection by numbers of fragments deposited in the garbage or beside the fungus garden. All the polyester film fragments carried out to the fungus garden were subsequently rejected. We verified that chemical factors of the substrate were more quickly detected by the workers, whereas physical factors were used as a criterion in the decision-making to reject or accept the substrate collected.

关键词： Atta sexdens rubropilosa attractiveness behavior leaf-cutting ants substraterejection substrate selection