Pesquisa | SciELO

Precisa de ajuda?

Adicionar outro campo +

Histórico de busca

Não foram encontrados documentos para sua pesquisa

Resultados: 13

au:CAVALHEIRO, ALBERTO JOSÉ

Filtros

Coleções + Opções

Todos
Brasil

12
Chile

1

Periódico + Opções

Todos
Química Nova

7
Anais da Academia Brasileira de Ciências

1
Journal of the Chilean Chemical Society

1
Materials Research

1
Revista Brasileira de Entomologia

1
Revista Brasileira de Farmacognosia

1
Revista Brasileira de Ortopedia

1

Idioma

Todos
Português

5

Ano de publicação + Opções

Todos
2010

2
2020

2
2002

1
2005

1
2008

1
2009

1
2012

1
2013

1
2015

1
2018

1
2022

1

SciELO Áreas Temáticas + Opções

Todos
Ciências Exatas e da Terra

8
Ciências da Saúde

2
Ciências Biológicas

1
Engenharias

1
Multidisciplinar

1

Mostrar tudo...

WoS Áreas Temáticas + Opções

Todos
Multidisciplinary

10
Chemistry

8
Chemical

1
Engineering

1
Entomologia

1
Materials

1
Metallurgical

1
Metallurgy

1
Ortopedia

1
Pharmacology

1
Pharmacy

1
Science

1
Sciences

1

WoS Índice de Citações

Todos
Science Citation Index Expanded

10

Citáveis e não citáveis

Todos
Citável

13

Tipo de literatura + Opções

Todos
Artigo

11
Comunicação rápida

1
Artigo de revisão

1

Ordenar por

Página de 1 Próxima

Selecionar esta página

Imprimir | Enviar por e-mail | Exportar |

Facebook
Twitter
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

0 Itens selecionados

Listar itens
Apagar todos da lista

METABOLIC PROFILING AND CYTOTOXIC ACTIVITY OF METHANOL EXTRACTS FROM CHAMAECRISTA DUCKEANA (P. BEZERRA & A. FERN.) H. S. IRWIN & BARNEBY (LEGUMINOSAE, CAESALPINIOIDEAE)
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Lima, Daniele Rodrigues de

; Franca, Maria Gleiziane de Araújo

; Oliveira, Fátima de Cássia Evangelista de

; Pessoa, Cláudia do Ó

; Cavalheiro, Alberto José

; Silva, Maria Goretti de Vasconcelos

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

Jul 2022, Volume 45 Nº 7 Páginas 803 - 806

Resumo: En | Texto: En | PDF: En

The genus Chamaecrista comprises more than 330 species, with only a few studies on their chemical composition and biologic activities. In this study, the phytochemical profile of leaf, stems, and fruits extracts of the C. duckeana were examined by UPLC ESI HRMS analysis to determine possibly bioactive constituents. The antioxidant activity was carried out through in vitro assay, by the sequestration of the free radical DPPH. To evaluate the cytotoxic activity of the extracts, an MTT assay was used and the IC50 was determined against HL60 and RAJI cell lines. The metabolic profiles of the botanical parts are dominated by flavonoid class, highlighting isoflavonoids such as daidzin and ononin. All these compounds are reported for the first time in C. duckeana. The extracts presented antioxidant potential, and the activity of the stems extract was higher than the standard butylated hydroxytoluene. In the cytotoxic assay, only HL60 line (leukemia) had growth inhibition over 80%. The stems presented more expressive cytotoxicity with IC50 of 137.3 (104.6-180.1) and 106.8 (96.52-118.3) μmol. L-1 for HL60 and RAJI, respectively. In conclusion, the present work provides an in-depth knowledge about the chemical profile of C. duckeana, a species rich in bioactive secondary metabolites with cytotoxic activity.

https://doi.org/10.21577/0100-4042.20170885

Femoroacetabular Impingement and Acetabular Labral Tears - Part 1: Pathophysiology and Biomechanics
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Ejnisman, Leandro

; Ricioli Júnior, Walter

; Queiroz, Marcelo Cavalheiro

; Vicente, Jose Ricardo Negreiros

; Croci, Alberto Tesconi

; Polesello, Giancarlo Cavalli

Revista Brasileira de Ortopedia

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

Out 2020, Volume 55 Nº 5 Páginas 518 - 522

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo O impacto femoroacetabular (IFA) é uma importante causa de dor no quadril, e a principal etiologia da osteoartrose do quadril no jovem. O IFA é caracterizado por alterações sutis da anatomia do acetábulo e do fêmur proximal que podem causar lesões do complexo condrolabial. O lábio é uma estrutura fibrocartilaginosa essencial na estabilidade articular. Três tipos de IFA são descritos: came (onde há uma anesfericidade da cabeça femoral), pincer (onde há uma sobrecobertura acetabular) e misto (que apresenta características de ambos). A etiologia do IFA está relacionada com características genéticas e ambientais. O conhecimento desta doença e sua fisiopatologia é essencial para o tratamento de pacientes que apresentam dor no quadril.

Abstract Femoroacetabular impingement (FAI) is an important cause of hip pain, and the main etiology of hip osteoarthritis in the young population. Femoroacetabular impingement is characterized by subtle alterations in the anatomy of the acetabulum and proximal femur, which can lead to labrum tearing. The acetabular labrum is essential to the stability of the hip joint. Three types of FAI were described: cam (anespherical femoral head), pincer (acetabular overcoverage) and mixed (characteristics of both cam and pincer). The etiology of FAI is related to genetic and environmental characteristics. Knowledge of this condition is essential to adequately treat patients presenting with hip pain.

https://doi.org/10.1055/s-0040-1702964 1424 downloads

Insect (Hexapoda) diversity in the oceanic archipelago of Fernando de Noronha, Brazil: updated taxonomic checklist and new records
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Rafael, José Albertino

; Limeira-de-Oliveira, Francisco

; Hutchings, Roger William

; Miranda, Gil Felipe Gonçalves

; Silva Neto, Alberto Moreira da

; Somavilla, Alexandre

; Camargo, Alexssandro

; Asenjo, Angélico

; Pinto, Ângelo Parise

; Bello, Ayr de Moura

; Dalmorra, Camila

; Mello-Patiu, Cátia Antunes de

; Carvalho, Claudio José Barros de

; Takiya, Daniela Maeda

; Parizotto, Daniele Regina

; Marques, Dayse Willkenia Almeida

; Cavalheiro, Denis de Oliveira

; Mendes, Diego Matheus de Mello

; Zeppelini, Douglas

; Carneiro, Eduardo

; Lima, Élison Fabrício Bezerra

; Lima, Estevam Cipriano Araújo de

; Godoi, Fabio Siqueira Pitaluga de

; Pessoa, Felipe Arley Costa

; Vaz-de-Mello, Fernando Zagury

; Sosa-Duque, Francisco José

; Flores, Heloísa Fernandes

; Fernandes, Itanna Oliveira

; Silva-Júnior, José Osvaldo

; Gomes, Lucas Roberto Pereira

; Monné, Marcela Laura

; Castro, Marcelo Cutrim Moreira de

; Silva, Marcelo Peixoto Gomes da

; Couri, Márcia Souto

; Gottschalk, Marco Silva

; Soares, Matheus Mickael Mota

; Monné, Miguel Angel

; Rafael, Miriam Silva

; Casagrande, Mirna Martins

; Mielke, Olaf Hermann Hendrik

; Grossi, Paschoal Coelho

; Pinto, Paula Jéssica Costa

; Bartholomay, Pedro Reck

; Sobral, Rafael

; Heleodoro, Raphael Aquino

; Machado, Renato José Pires

; Corrêa, Robson Crepes

; Hutchings, Rosa Sá Gomes

; Ale-Rocha, Rosaly

; Santos, Sandra Duque dos

; Lima, Sheila Pereira de

; Mahlmann, Thiago

; Silva, Vera Cristina

; Fernandes, Daniell Rodrigo Rodrigues

Revista Brasileira de Entomologia

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2020, Volume 64 Nº 3 elocation e20200052

Resumo: En | Texto: En | PDF: En

ABSTRACT Hexapods, commonly known as insects, are a neglected taxonomic group in the Fernando de Noronha archipelago, with unanswered questions about their species richness and the ecological processes in which they are involved (e.g., colonization, introduction, establishment, and extinction). Herein, we provide an updated Hexapod checklist with current nomenclatural combinations. The entomofauna of the Fernando de Noronha archipelago is currently composed of 453 species in 21 orders. The orders, and their respective number of species, are: Blattaria (9), Coleoptera (118), Collembola (29), Dermaptera (3), Diplura (1), Diptera (134), Embioptera (1), Hemiptera (29), Hymenoptera (59), Isoptera (2), Lepidoptera (25), Mantodea (1), Neuroptera (3), Odonata (5), Orthoptera (11), Phasmatodea (1), Phthiraptera (6), Psocoptera (3), Siphonaptera (1), Thysanoptera (10), and Zygentoma (2). The archipelago has 263 new taxon records (family + genera + species). Thirty-eight species (3.39%) were described from local specimens and most of them are likely endemic species. This study more than doubles our knowledge (from the previous 190 records) of the entomofauna in this large Brazilian archipelago. This study also provides a baseline for studies on its conservation status and for implementing future environmental management programs.

https://doi.org/10.1590/1806-9665-rbent-2020-0052 2462 downloads

Coupled monolithic columns as an alternative for the use of viscous ethanol–water mobile phases on chromatographic fingerprinting complex samples
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Funari, Cristiano Soleo

; Cavalheiro, Alberto José

; Carneiro, Renato Lajarim

Revista Brasileira de Farmacognosia

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

Jun 2018, Volume 28 Nº 3 Páginas 261 - 266

Resumo: En | Texto: En | PDF: En

ABSTRACT Concepts of sustainability have received attention from people involved in investigation of nature-derived matrices. The effects of concomitant pollutant activities are cumulative and harmful to the environment from which these matrices are obtained. High performance liquid chromatography analyses generate millions of litters of chemical waste worldwide every year. Reduction of organic solvent consumption during the analyses and replacement of harmful solvents with greener options are the main approaches to mitigate this problem. This work explored the strategy of employing monolithic columns when the problematic acetonitrile is intended to be replaced with the greener but more viscous ethanol in fingerprinting a leaf extract of Lippia sidoides Cham., Verbenaceae, by high performance liquid chromatography. Two monolithic columns were coupled in series to test a more critical backpressure condition while doubling the number of theoretical plates, which can be useful to separate the hundreds of compounds present in plant extracts. All work was conducted by employing design of experiments. A mathematical model indicated an optimum point in which ethanol was the only organic solvent of the mobile phase. However, the use of a proper metric, which considered environmental parameters together with separation parameters, evidenced that an experimental condition of the original central composite design should be preferred over the former even if containing 20% acetonitrile in the organic modifier mixture. Flow rates of up to 3 ml/min were accommodated with two coupled monolithic columns without exceeding 250 bar. These findings reinforced that no state-of-the-art instruments are needed to shift from traditional harmful solvents to greener ones, but only require a shift in researchers’ approach toward sustainability.

https://doi.org/10.1016/j.bjp.2018.04.010 544 downloads

Counteracting effects on free radicals and histological alterations induced by a fraction with casearins
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

ARAÚJO, ÉVERTON JOSÉ FERREIRA DE

; OLIVEIRA, GUILHERME ANTÔNIO LOPES DE

; SOUSA, LÍVIA QUEIROZ DE

; BOLZANI, VANDERLAN DA SILVA

; CAVALHEIRO, ALBERTO JOSÉ

; TOME, ADRIANA DA ROCHA

; PERON, ANA PAULA

; SANTOS, ANDRÉ GONZAGA DOS

; CITÓ, ANTONIA MARIA DAS GRAÇAS LOPES

; PESSOA, CLÁUDIA

; FREITAS, RIVELILSON MENDES DE

; FERREIRA, PAULO MICHEL PINHEIRO

Anais da Academia Brasileira de Ciências

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

Set 2015, Volume 87 Nº 3 Páginas 1791 - 1807

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMOCasearia sylvestris Swartz é uma planta medicinal amplamente distribuída no Brasil. Ela possui atividade anti-inflamatória, antiulcerogênica e antitumoral e é popularmente utilizada para tratar envenenamentos ofídicos, ferimentos, diarreia, gripes e resfriados. Suas folhas são ricas em diterpenos clerodânicos tricíclicos oxigenados, particularmente casearinas. Aqui, nós avaliamos as atividades antioxidantes de um fração com casearinas (FC) isolada de C. sylvestrise as alterações histológicas no sistema nervoso central e fígados de camundongos Mus musculus. Primeiramente, estudos in vitro(0,9, 1,8, 3,6, 5,4 e 7,2 μg/mL) revelaram valores de CE50 de 3,7, 6,4 e 0,16 µg/mL para nitrito, radical hidroxila e níveis de TBARS, respectivamente. Em seguida, a FC (2,5, 5, 10 e 25 mg/kg/dia) foi administrada intraperitonealmente por 7 dias consecutivos em camundongos Swiss. Os níveis de nitrito no hipocampo (26,2, 27,3, 30,2 e 26,6 µM) e no corpo estriado (26,3, 25,4, 34,3 e 27,5 µM) aumentaram em todos os animais tratados com a FC (P < 0.05). As menores doses reduziram os níveis de glutationa reduzida, de catalase e de TBARS no hipocampo e no corpo estriado. Com exceção da redução na formação de TBARS, a FC demonstrou atividade antioxidante apenas in vitro. Os animais exibiram alterações histológicas que sugerem neurotoxicidade e hepatotoxicidade, indicando a necessidade de cuidados em relação ao consumo de preparações medicinais à base de Casearia sylvestris.

ABSTRACTCasearia sylvestris Swartz is a medicinal plant widely distributed in Brazil. It has anti-inflammatory, antiulcer and antitumor activities and is popularly used to treat snakebites, wounds, diarrhea, flu and chest colds. Its leaves are rich in oxygenated tricyclic cis-clerodane diterpenes, particulary casearins. Herein, we evaluated the antioxidant activities of a fraction with casearins (FC) isolated from C. sylvestrisand histological changes on the central nervous system and livers of Mus musculus mice. Firstly, in vitro studies (0.9, 1.8, 3.6, 5.4 and 7.2 μg/mL) revealed EC50 values of 3.7, 6.4 and 0.16 µg/mL for nitrite, hydroxyl radical and TBARS levels, respectively. Secondly, FC (2.5, 5, 10 and 25 mg/kg/day) was intraperitoneally administered to Swiss mice for 7 consecutive days. Nitrite levels in the hippocampus (26.2, 27.3, 30.2 and 26.6 µM) and striatum (26.3, 25.4, 34.3 and 27.5 µM) increased in all treated animals (P < 0.05). Lower doses dropped reduced glutathione, catalase and TBARS levels in the hippocampus and striatum. With the exception of this reduction in TBARS formation, FC displayed only in vitro antioxidant activity. Animals exhibited histological alterations suggestive of neurotoxicity and hepatotoxicity, indicating the need for precaution regarding the consumption of medicinal formulations based on Casearia sylvestris.

https://doi.org/10.1590/0001-3765201520150149 2424 downloads

Metabolômica, uma abordagem otimizada para exploração da biodiversidade brasileira: estado da arte, perspectivas e desafios
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Funari, Cristiano Soleo

; Castro-Gamboa, Ian

; Cavalheiro, Alberto José

; Bolzani, Vanderlan da Silva

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2013, Volume 36 Nº 10 Páginas 1605 - 1609

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Brazilian biodiversity is a colossal source of secondary metabolites with remarkable structural features, which are valuable in further biodiscovery studies. In order to fully understand the relations and interactions of a living system with its surroundings, efforts in natural product chemistry are directed toward the challenge of detecting and identifying all the molecular components present in complex samples. It is plausible that this endeavor was born out of recent technological sophistication in secondary metabolite identification with sensitive spectroscopic instruments (MS and NMR) and higher resolving power of chromatographic systems, which allow a decrease in the amount of required sample and time to acquire data. Nevertheless, the escalation of data acquired in these analyses must be sorted with statistical and multi-way tools in order to select key information. Chromatography is also of paramount importance, more so when selected compounds need to be isolated for further investigation. However, in the course of pursuing a "greener" environment, new policies, with an aim to decrease the use of energy and solvents, are being developed and incorporated into analytical methods. Metabolomics could be an effective tool to answer questions on how living organisms in our huge biodiversity work and interact with their surroundings while also being strategic to the development of high value bio-derived products, such as phytotherapeutics and nutraceuticals. The incorporation of proper phytotherapeutics in the so-called Brazilian Unified Health System is considered an important factor for the urgent improvement and expansion of the Brazilian national health system. Furthermore, this approach could have a positive impact on the international interest toward scientific research developed in Brazil as well as the development of high value bio-derived products, which appear as an interesting economic opportunity in national and global markets. Thus, this study attempts to highlight the recent advances in analytical tools used in detection of secondary metabolites, which can be useful as bioproducts. It also emphasizes the potential avenues to be explored in Brazilian biodiversity, known for its rich chemical diversity.

7152 downloads Citado 2 vezes em SciELO

Tropical biodiversity: has it been a potential source of secondary metabolites useful for medicinal chemistry?
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Valli, Marilia

; Pivatto, Marcos

; Danuello, Amanda

; Castro-Gamboa, Ian

; Silva, Dulce Helena Siqueira

; Cavalheiro, Alberto José

; Araújo, Ângela Regina

; Furlan, Maysa

; Lopes, Márcia Nasser

; Bolzani, Vanderlan da Silva

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2012, Volume 35 Nº 11 Páginas 2278 - 2287

Resumo: En | Texto: En | PDF: En

The use of natural products has definitely been the most successful strategy in the discovery of novel medicines. Secondary metabolites from terrestrial and marine organisms have found considerable use in the treatment of numerous diseases and have been considered lead molecules both in their natural form and as templates for medicinal chemistry. This paper seeks to show the great value of secondary metabolites and emphasize the rich chemical diversity of Brazilian biodiversity. This natural chemical library remains understudied, but can be a useful source of new secondary metabolites with potential application as templates for drug discovery.

8323 downloads Citado 1 vez em SciELO

Efeitos da adição de átomos de Mn na rede do GaN via métodos de estrutura eletrônica
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Mazini, Melânia Cristina

; Sambrano, Julio Ricardo

; Cavalheiro, Alberto Adriano

; Leite, Douglas Marcel Gonçalves

; Silva, José Humberto Dias da

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2010, Volume 33 Nº 4 Páginas 834 - 840

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

A computational method to simulate the changes in the electronic structure of Ga1-xMn xN was performed in order to improve the understanding of the indirect contribution of Mn atoms. This periodic quantum-mechanical method is based on density functional theory at B3LYP level. The electronic structures are compared with experimental data of the absorption edge of the GaMnN. It was observed that the indirect influence of Mn through the structural parameters can account for the main part of the band gap variation for materials in the diluted regime (x<0.08), and is still significant for higher compositions (x~0.18).

2495 downloads

Aromatic compounds from three Brazilian Lauraceae species
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Batista, Andrea Nastri de Luca

; Batista Junior, João Marcos

; López, Silvia Noelí

; Furlan, Maysa

; Cavalheiro, Alberto José

; Silva, Dulce Helena Siqueira

; Bolzani, Vanderlan da Silva

; Nunomura, Sergio Massayoshi

; Yoshida, Massayoshi

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2010, Volume 33 Nº 2 Páginas 321 - 323

Resumo: En | Texto: En | PDF: En

Phytochemical investigations on three Brazilian Lauraceae species from the Cerrado region of São Paulo State, Ocotea corymbosa (Meins) Mez., O. elegans Mez. and Persea pyrifolia Nees & Mart. ex Nees resulted in the isolation of flavonoids, an ester of the 4-O-E-caffeoylquinic acid, an aromatic sesquiterpene besides furofuran lignans. This is the first chemical study on the leaves of Ocotea elegans and O. corymbosa as well as the first report of non-volatile compounds from Persea pyrifolia.

4562 downloads

10.

IDENTIFICATION OF TRITERPENES AND STEROLS FROM PTEROGYNE NITENS (FABACEAE-CAESALPINIOIDEAE) USING HIGH-RESOLUTION GAS CHROMATOGRAPHY
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

REGASINI, LUIS OCTÁVIO

; MAGELA VIEIRA-JÚNIOR, GERARDO

; FERNANDES, DANIARA CRISTINA

; DA SILVA BOLZANI, VANDERLAN

; CAVALHEIRO, ALBERTO JOSÉ

; SIQUEIRA SILVA, DULCE HELENA

Journal of the Chilean Chemical Society

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2009, Volume 54 Nº 3 Páginas 218 - 221

Resumo: En | Texto: En | PDF: En

As part of our ongoing bioprospecting studies on secondary metabolites in plants of Cerrado and Atlantic Rain Forest of São Paulo State (Brazil), we describe the identification of triterpenes and sterols present in the hexane extracts and foliar epicuticular wax of Pterogyne nitens Tulasne (Fabaceae-Caesalpinioideae) using high resolution gas chromatography. Compounds detected in these extracts include ß-amyrin (1), taraxerol acetate (2), lupenone (3), ß-amyrenone (4), germanicone (5), campesterol (6), stigmasterol (7), and ß-sitosterol (8). The method reported herein is shown to be a rapid, sensitive and reproducible tool for describing triterpenes and sterols present in non-polar extracts.

5561 downloads Citado 2 vezes em SciELO

11.

Saponinas antifúngicas de Swartzia langsdorffii
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Marqui, Sara Regina de

; Lemos, Renata Brionízio

; Santos, Luciana Ávila

; Castro-Gamboa, Ian

; Cavalheiro, Alberto José

; Bolzani, Vanderlan da Silva

; Silva, Dulce Helena Siqueira

; Scorzoni, Liliana

; Fusco-Almeida, Ana Maria

; Mendes-Giannini, Maria José Soares

; Young, Maria Claudia Marx

; Torres, Luce Maria Brandão

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

2008, Volume 31 Nº 4 Páginas 828 - 831

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Chromatographic fractionation of the EtOH extract from the leaves of Swartzia langsdorffii afforded the pentacyclic triterpenes oleanolic acid and lupeol, and two saponins: oleanolic acid 3-sophoroside and the new ester 3-O-b-D-(6'-methyl)-glucopyranosyl-28-O-b-D-glucopyranosyl-oleanate. Their structures were elucidated from spectral data, including 2D NMR and HRESIMS experiments. Antifungal activity of all isolated compounds was evaluated, using phytopathogens Cladosporium cladosporioides and C. sphaerospermum, and human pathogens Candida albicans, C. krusei, C. parapsilosis and Cryptococcus neoformans.

5624 downloads Citado 1 vez em SciELO

12.

Saponinas triterpênicas de Tocoyena brasiliensis Mart. (Rubiaceae)
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Hamerski, Lidilhone

; Carbonezi, Carlos Alberto

; Cavalheiro, Alberto José

; Bolzani, Vanderlan da Silva

; Young, Maria Cláudia Marx

Química Nova

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

Ago 2005, Volume 28 Nº 4 Páginas 601 - 604

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

The present communication reports the isolation and identification of four triterpenoid saponins from the chloroform extract of the leaves of Tocoyena brasiliensis: 3-O-beta-D-quinovopyranosyl quinovic acid, 3-O-beta-D-quinovopyranosyl cincholic acid, 3-O-beta-D-glucopyranosyl quinovic acid and the 28-O-beta-D-glucopyranosyl ester derivative of quinovic acid as binary mixtures, respectively. From the ethanol extract a flavonoid identified as ramnazin-3-O-rutinoside was obtained. The structures of these compounds were assigned by data analysis of 1D and 2D NMR spectrometry and comparison with data recorded in the literature for these compounds.

4190 downloads Citado 1 vez em SciELO

13.

Effect of the Addition of Potassium or Lithium on the Columbite Precursor Microstructure
Facebook Twitter

Outras redes sociais
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Outras redes

Métricas
- SciELO Analytics

Cavalheiro, Alberto A.

; Zaghete, Maria A.

; Paiva-Santos, Carlos O.

; Varela, José A.

Materials Research

Métricas do periódico
- Sobre o periódico
- SciELO Analytics

Out 2002, Volume 5 Nº 4 Páginas 399 - 404

Resumo: En | Texto: En | PDF: En

Pechini method has been used to synthesize MN powders with stoichiometric control. By this method, K and Li-doped MN in the range from 0.1 to 5.0 mol% of dopants have been obtained at relatively lower temperatures than it is possible with the conventional mixture of oxides. The results from BET analysis indicated that the doped powders have lower surface area and the attrition milling promotes an increase in surface area values for all powders. Rietveld method was used to calculate the mean crystallite size and the microstrain in the crystal. With additions of up to 5.0 mol% of K or 2.0 mol% of Li, it is possible to obtain MN as a solid solution. Both dopants change the cell parameters of the columbite phase crystal, reduce the microstrain, and increase the main crystallite size. The analysis of results from SEM indicates that powders prepared with addition of dopants are more agglomerate than pure PMN powder.

1545 downloads

Exibindo

itens por página

Página de 1 Próxima

Selecione um ou mais resultados

Todos Ordem alfabética

Resultados

Gráfico comparativo Download CSV

Visualizar estatísticas de

Enviar resultado

E-mail do(s) destinatários*

Utilize ; (ponto e vírgula) para mais de um e-mail.

Enviar por e-mail

Esta página

Registros selecionados

Todos os registros (max. 300)

Alterar remetente, assunto e comentários

Seu email

Assunto

Comentários

Alterar remetente, assunto e comentários

Exportar resultados

Formato de exportação:

RIS (para EndNote, ProCite, Reference Manager, RefWorks, Citavi, etc.)

BibTeX

Citação

CSV (para Excel, etc)

Exportar:

Esta página

Itens selecionados

Todos os registros (max. 2000)

Mostrar mais

Sem resultados

Não foram encontrados documentos para sua pesquisa

Glossário e ajuda para busca

Você pode enriquecer sua busca de uma forma muito simples. Use os índices de pesquisa combinados com os conectores (AND ou OR) e especifique cada vez mais sua busca.

Por exemplo, se você deseja buscar artigos sobre
casos de dengue no Brasil em 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

Veja abaixo a lista completa de índices de pesquisa que podem ser usados:

Cód. do Índice	Elemento
ti	título do artigo
au	autor
kw	palavras-chave do artigo
subject	assunto (palavras do título, resumo e palavras-chave)
ab	resumo
ta	título abreviado da revista (ex. Cad. Saúde Pública)
journal_title	título completo da revista (ex. Cadernos de Saúde Pública)
la	código do idioma da publicação (ex. pt - Português, es - Espanhol)
type	tipo do documento
pid	identificador da publicação
publication_year	ano de publicação do artigo
sponsor	financiador
aff_country	código do país de afiliação do autor
aff_institution	instituição de afiliação do autor
volume	volume do artigo
issue	número do artigo
elocation	elocation
doi	número DOI
issn	ISSN da revista
in	código da coleção SciELO (ex. scl - Brasil, col - Colômbia)
use_license	código da licença de uso do artigo

SciELO - Scientific Electronic Library Online
Rua Dr. Diogo de Faria, 1087 – 9º andar – Vila Clementino 04037-003 São Paulo/SP - Brasil
Email: scielo@scielo.org

Todo o conteúdo de www.scielo.org, exceto onde está identificado, está licenciado sob uma Licença Creative Commons.
saiba mais »