Pesquisa | SciELO

Abstract Lychnophora pinaster, known as arnica-mineira, is endemic to campos rupestres, at risk of extinction. The present study aimed to characterize the ecogeography and phenolic constituents of 11 L. pinaster populations collected in the mesoregions North, Jequitinhonha, Metropolitan of Belo Horizonte and Campos das Vertentes in the state of Minas Gerais, Brazil. Phenolic constituents were identified and quantified by Ultra-high performance liquid chromatography- mass spectrometry. Lychnophora pinaster occurs in sites at high altitude (700 and 1498 m), annual rainfall of up to 1455 m, soils with low fertility and predominantly loamy texture. Therefore, it can be considered tolerant to acidic soils, with low availability of nutrient. The most abundant substances in all populations were vitexin (18 – 1345 ng/g) and chlorogenic acid (60 – 767 ng/g). The 11 populations formed four groups in relation to the phenolic constituents, with group 1 consisting of the populations of the North Mesoregion (GM, OD) and Jetiquinhonha (DIMa), group 2, the Metropolitan of Belo Horizonte (SRM, NLSC, SM, RPS, CTRA), group 3, the North Mesoregion (ODMa and DI), and group 4, the Campos das Vertentes (CC). Among the populations, only those from the Metropolitan of Belo Horizonte showed correlation of soil properties with phenolic constituents.

https://doi.org/10.1590/0001-3765202320201399

Sudden unexpected death in Parkinson's disease: Insights from clinical practice
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Scorza, Fulvio A

; Guimarães-Marques, Marcia

; Nejm, Mariana

; Almeida, Antônio Carlos G de

; Scorza, Carla A

; Fiorini, Ana C

; Finsterer, Josef

Clinics

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2022, Volume 77 elocation 100001

Resumo: En | Texto: En | PDF: En

Abstract Classified as the second most common neurodegenerative disorder associated with aging after Alzheimer's disease, Parkinson's disease (PD) is the most common movement disorder. In the last decade, despite advances in treatment, mortality rates linked with PD continued to reach significant figures. Available studies have shown that compared with healthy controls, patients with PD are accompanied by high rates of premature death. This is usually caused by factors such as pneumonia and cerebrovascular and cardiovascular diseases. Recently, it has been demonstrated that a significant proportion of patients with PD die suddenly. This is referred to as a sudden and unexpected death in PD (SUDPAR). Here, we focus on the magnitude of SUDPAR. Finally, it is important to learn more about SUDPAR for the implementation of effective prevention strategies.

https://doi.org/10.1016/j.clinsp.2021.100001

FATTY ACIDS ANALYSIS AND CHEMOTAXONOMIC CONSIDERATIONS OF MALVOIDEAE (MALVACEAE) SPECIES
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Fernandes, Diégina A.

; Chaves, Otemberg S.

; Teles, Yanna C. F.

; Agra, Maria de F.

; Vieira, Maria A. R.

; Silva, Paulo S. S. da

; Marques, Marcia O. M.

; Souza, Maria de Fátima Vanderlei de

Química Nova

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Fev 2021, Volume 44 Nº 2 Páginas 137 - 141

Resumo: En | Texto: En | PDF: En

Previous researches showed that fatty acids analysis might be a useful tool to support the taxonomic investigation. In this approach the fatty acids content of ten Malvoideae species was analyzed and its chemotaxonomic significance has been investigated. The aerial parts of the species were collected in the Northeast of Brazil and their fatty acid methyl esters were analyzed by gas chromatography with flame ionization detector. The chemometric analysis consisted of principal component analysis (PCA) and hierarchical clustering analysis (HCA) with the euclidean distance between the samples given by the Ward.D2 algorithm. This is the first report of fatty acids from Wissadula peripocifolia, Herissantia crispa, Bakeridesia pickelii, Sidastrum micranthum, Pavonia cancellata and Pavonia malacophylla. The results showed the predominance of palmitic (C16:0), oleic (C18:1) and linoleic (C18:2) acids in the studied species. By the PCA and HCA analysis, the fatty acid composition was able to distinguish the species Herissantia crispa and Pavonia malacophylla. Our findings showed a chemotaxonomic proximity among species from different genera reflecting the taxonomic and phylogenetic closeness previously demonstrated by molecular investigations on Malvoidae species. Furthermore, our results demonstrated that the fatty acid analysis may be an interesting tool to support the taxonomic investigations on Malvoideae species.

https://doi.org/10.21577/0100-4042.20170668 125 downloads

The Program for Biodiversity Research in Brazil: The role of regional networks for biodiversity knowledge, dissemination, and conservation
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ROSA, CLARISSA

; BACCARO, FABRICIO

; CRONEMBERGER, CECILIA

; HIPÓLITO, JULIANA

; BARROS, CLAUDIA FRANCA

; RODRIGUES, DOMINGOS DE JESUS

; NECKEL-OLIVEIRA, SELVINO

; OVERBECK, GERHARD E.

; DRECHSLER-SANTOS, ELISANDRO RICARDO

; ANJOS, MARCELO RODRIGUES DOS

; FERREGUETTI, ÁTILLA C.

; AKAMA, ALBERTO

; MARTINS, MARLÚCIA BONIFÁCIO

; TOMAS, WALFRIDO MORAES

; SANTOS, SANDRA APARECIDA

; FERREIRA, VANDA LÚCIA

; CUNHA, CATIA NUNES DA

; PENHA, JERRY

; PINHO, JOÃO BATISTA DE

; SALIS, SUZANA MARIA

; DORIA, CAROLINA RODRIGUES DA COSTA

; PILLAR, VALÉRIO D.

; PODGAISKI, LUCIANA R.

; MENIN, MARCELO

; BÍGIO, NARCÍSIO COSTA

; ARAGÓN, SUSAN

; MANZATTO, ANGELO GILBERTO

; VÉLEZ-MARTIN, EDUARDO

; SILVA, ANA CAROLINA BORGES LINS E

; IZZO, THIAGO JUNQUEIRA

; MORTATI, AMANDA FREDERICO

; GIACOMIN, LEANDRO LACERDA

; ALMEIDA, THAÍS ELIAS

; ANDRÉ, THIAGO

; SILVEIRA, MARIA AUREA PINHEIRO DE ALMEIDA

; SILVEIRA, ANTÔNIO LAFFAYETE PIRES DA

; MESSIAS, MARILUCE REZENDE

; MARQUES, MARCIA C.M.

; PADIAL, ANDRE ANDRIAN

; MARQUES, RENATO

; BITAR, YOUSZEF O.C.

; SILVEIRA, MARCOS

; MORATO, ELDER FERREIRA

; PAGOTTO, RUBIANI DE CÁSSIA

; STRUSSMANN, CHRISTINE

; MACHADO, RICARDO BOMFIM

; AGUIAR, LUDMILLA MOURA DE SOUZA

; FERNANDES, GERALDO WILSON

; OKI, YUMI

; NOVAIS, SAMUEL

; FERREIRA, GUILHERME BRAGA

; BARBOSA, FLÁVIA RODRIGUES

; OCHOA, ANA C.

; MANGIONE, ANTONIO M.

; GATICA, AILIN

; CARRIZO, MARÍA CELINA

; RETTA, LUCÍA MARTINEZ

; JOFRÉ, LAURA E.

; CASTILLO, LUCIANA L.

; NEME, ANDREA M.

; RUEDA, CARLA

; TOLEDO, JOSÉ JULIO DE

; GRELLE, CARLOS EDUARDO VIVEIROS

; VALE, MARIANA M.

; VIEIRA, MARCUS VINICIUS

; CERQUEIRA, RUI

; HIGASHIKAWA, EMÍLIO MANABU

; MENDONÇA, FERNANDO PEREIRA DE

; GUERREIRO, QUÊZIA LEANDRO DE MOURA

; BANHOS, AUREO

; HERO, JEAN-MARC

; KOBLITZ, RODRIGO

; COLLEVATTI, ROSANE GARCIA

; SILVEIRA, LUÍS FÁBIO

; VASCONCELOS, HERALDO L.

; VIEIRA, CECÍLIA RODRIGUES

; COLLI, GUARINO RINALDI

; CECHIN, SONIA ZANINI

; SANTOS, TIAGO GOMES DOS

; FONTANA, CARLA S.

; JARENKOW, JOÃO A.

; MALABARBA, LUIZ R.

; RUEDA, MARTA P.

; ARAUJO, PUBLIO A.

; PALOMO, LUCAS

; ITURRE, MARTA C.

; BERGALLO, HELENA GODOY

; MAGNUSSON, WILLIAM E.

Anais da Academia Brasileira de Ciências

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2021, Volume 93 Nº 2 elocation e20201604

Resumo: En | Texto: En | PDF: En

Abstract The Program for Biodiversity Research (PPBio) is an innovative program designed to integrate all biodiversity research stakeholders. Operating since 2004, it has installed long-term ecological research sites throughout Brazil and its logic has been applied in some other southern-hemisphere countries. The program supports all aspects of research necessary to understand biodiversity and the processes that affect it. There are presently 161 sampling sites (see some of them at Supplementary Appendix), most of which use a standardized methodology that allows comparisons across biomes and through time. To date, there are about 1200 publications associated with PPBio that cover topics ranging from natural history to genetics and species distributions. Most of the field data and metadata are available through PPBio web sites or DataONE. Metadata is available for researchers that intend to explore the different faces of Brazilian biodiversity spatio-temporal variation, as well as for managers intending to improve conservation strategies. The Program also fostered, directly and indirectly, local technical capacity building, and supported the training of hundreds of undergraduate and graduate students. The main challenge is maintaining the long-term funding necessary to understand biodiversity patterns and processes under pressure from global environmental changes.

https://doi.org/10.1590/0001-3765202120201604 1034 downloads

Extração de biomassa aderida ao meio-suporte de um reator de leito móvel com biofilme: agitação mecânica e ultrassom
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Silva, Alexandre Silveira Amaro da

; Castro, Renata Aguiar de

; Martins, Sheila Barbosa

; Alvim, Rodrigo Derossi

; Salomão, André Luís de Sá

; Marques, Marcia

Engenharia Sanitaria e Ambiental

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Dez 2020, Volume 25 Nº 6 Páginas 901 - 908

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

RESUMO A quantificação de biomassa fixa em reatores de leito móvel com biofilme (MBBRs) é essencial para avaliação e controle do desempenho deles. Entretanto, observa-se que tal quantificação é realizada empregando-se diversas técnicas, o que dificulta comparações entre resultados. No presente trabalho, foram testadas duas das principais técnicas (agitação mecânica e ultrassom) utilizadas para extração de biomassa aderida aos meios-suporte (mídias) de um MBBR sem utilização de agentes químicos. Os desenhos experimentais foram realizados utilizando-se planejamento fatorial completo, e, para tal, foram selecionadas duas variáveis independentes: tempo (T) de exposição de 15 a 60 min; e volume de água destilada utilizado para extração (V) de 100 a 400 mL. O ultrassom mostrou-se superior à agitação mecânica quanto à eficiência no percentual extraído de sólidos suspensos totais (%SST), e embora nenhuma das variáveis (T ou V) tenha contribuído significativamente nas faixas testadas, com base na superfície de respostas, foi conduzido um novo experimento, ampliando a faixa de T de 5 a 90 min. A variável T contribuiu significativamente para o %SST, e o melhor resultado foi obtido com T = 90 min. Recomenda-se o uso de ultrassom, volume de mais fácil manuseio (250 mL) e T = 90 min. Ensaios adicionais são recomendados, tendo em vista a padronização do método.

ABSTRACT Quantification of attached biomass in Moving Bed Biofilm Reactors (MBBR) is essential for performance assessment and process control. However, it is observed that such quantification is performed using the most diverse techniques, which hampers comparisons between results. In this investigation, two of the main techniques used (mechanical agitation and ultrasound) were compared for removal of the biomass attached to the support media of an MBBR reactor without the use of chemical agents. The experiments were planned following full factorial designs using the two independent variables: Exposure time (T) from 15 to 60 min; and Volume of distillate water used for extraction (V) from 100 to 400 mL. The results revealed that ultrasound is superior to mechanical agitation regarding detachment of the total suspended solids (%TSS) and though neither T or V contributed significantly within the interval tested, based on the response surface, a new experiment was performed using an increased T range from 5 to 90 min. Then, exposure time contributed significantly to the %TSS detachment, with the best result at 90 min. The use of ultrasound is therefore recommended, with volume that is easier to handle (250 mL) and time equal to 90 min. Additional tests are recommended for method standardization.

https://doi.org/10.1590/s1413-4152202020180113 629 downloads

Alcohol and sudden unexpected death in epilepsy: do not pop the cork
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Scorza, Carla A.

; Guimarães-Marques, Marcia

; Girão, Eduardo R.C.

; Nejm, Mariana

; Finsterer, Josef

; Girão, Manoel J.B.C.

; Younes, Riad N.

; Laranjeira, Ronaldo R.

; Scorza, Fulvio A.

Clinics

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2020, Volume 75 elocation e1770

Resumo: En | Texto: En | PDF: En

https://doi.org/10.6061/clinics/2020/e1770 797 downloads

Expression of tumor suppressors miR-195 and let-7a as potential biomarkers of invasive breast cancer
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Marques, Marcia M.

; Evangelista, Adriane F.

; Macedo, Taciane

; Vieira, René Aloisio da Costa

; Scapulatempo-Neto, Cristovam

; Reis, Rui M.

; Carvalho, André L.

; Silva, Ismael Dale Cotrim Guerreiro da

Clinics

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2018, Volume 73 elocation e184

Resumo: En | Texto: En | PDF: En

OBJECTIVE: MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression at the posttranscriptional level. Some miRNAs, including let-7a and miR-195, have been described as tumor suppressors. However, the roles of these microRNAs in breast cancer progression remain controversial. The aim of this study is to evaluate miR-195 and let-7a expression as potential biomarkers of invasive breast cancer. METHODS: In the present study, 200 individuals were separated into three groups: (i) 72 women constituting the control group who were selected according to rigorous and well-established criteria; (ii) 56 patients with benign breast tumors; and (iii) 72 patients with malignant breast cancers of different clinical stages. The miR-195 and let-7a expression levels in serum were evaluated by real-time PCR. The results were assessed alone and in combination, and the analysis included an estimation of sensitivity and specificity in ROC curves. RESULTS: Compared with the benign and control groups, both microRNAs were downregulated in the malignant breast cancer patient group. Compared with the malignant group, the combination of both biomarkers in the control and benign groups showed good sensitivity and specificity in the serum with AUCs of 0.75 and 0.72, respectively. The biomarker combination for the control group versus the malignant group exhibited a better sensitivity and specificity than for the benign group versus the malignant group. CONCLUSION: These findings support the evidence that the analysis of miR-195 and let-7a can be used as a non-invasive biomarker for breast cancer detection.

https://doi.org/10.6061/clinics/2018/e184 1034 downloads

Germinação in vitro e desenvolvimento pós-seminal de Ruta graveolens L. sob influência de fenantreno e benzo[a]pireno
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Lemos, Siomara Dias da Costa

; Rebello, Thiago José Jesus

; Pinto, Juliana Lyra Queiroz

; Marques, Marcia

; Albarello, Norma

Revista Ciência Agronômica

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Dez 2016, Volume 47 Nº 4 Páginas 737 - 743

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

RESUMO A exposição a contaminantes orgânicos como os hidrocarbonetos policíclicos aromáticos tem atraído considerável atenção devido aos efeitos dessas substâncias sobre a saúde humana, o ambiente e o desenvolvimento vegetal. O presente estudo objetivou avaliar a influência do fenantreno e do benzo[a]pireno sobre a germinação e o desenvolvimento pós-seminal in vitro de R. graveolens. Sementes comerciais descontaminadas foram inoculadas em tubos de ensaio com meio MS suplementado com 0 (controle); 1,0; 5,0 e 10,0 mg L-1 de fenantreno e 0 (controle); 0,001; 0,01 e 0,1 mg L-1 de benzo[a]pireno. Foram avaliados a porcentagem de sementes germinadas, o índice de velocidade de germinação e a entropia. Após dois meses, avaliou-se o comprimento da parte aérea e radicular e contabilizou-se o número de folhas desenvolvidas. Durante o primeiro mês, a presença do fenantreno não alterou o processo germinativo, enquanto que o benzo[a]pireno na concentração de 0,01 mg L-1 proporcionou aumento significativo da germinação (p≤0,05). Durante o segundo mês, as concentrações de 5,0 mg L-1 de fenantreno e de 0,001 mg L-1 benzo[a]pireno resultaram em desenvolvimento radicular significativamente superior. Não foram detectadas diferenças significativas quanto à fitomassa, ao desenvolvimento da parte aérea e número de folhas por plântulas. Tais resultados sugerem potencial para o cultivo de R. graveolens em áreas contaminadas, nos níveis investigados.

ABSTRACT Exposure to organic contaminants, such as polycyclic aromatic hydrocarbons, has attracted considerable attention due to the effects of these substances on human health, the environment and plant development. This study aimed to evaluate the influence of phenanthrene and benzo[a]pyrene on the germination and post-seminal in vitro development of R. graveolens. Decontaminated commercial seeds were inoculated in test tubes with an MS medium supplemented with 0 (control), 1.0, 5.0 and 10.0 mg L-1 phenanthrene and 0 (control), 0.001, 0.01 and 0.1 mg L-1 benzo[a]pyrene. The percentage of germinated seeds, germination speed index and entropy were evaluated. After two months, shoot and root length were all evaluated, and the number of developed leaves was counted. During the first month, the presence of phenanthrene did not alter the germination process, whereas benzo[a]pyrene at a concentration of 0.01 mg L-1 gave a significant increase in germination (p≤0.05). During the second month, the concentrations of 5.0 mg L-1 phenanthrene and 0.001 mg L-1 benzo[a]pyrene resulted in significantly greater root development. No significant differences were found in biomass, shoot development or number of leaves per seedling. Such results suggest the potential for growing R. graveolens in contaminated areas at the levels studied.

https://doi.org/10.5935/1806-6690.20160088 1082 downloads

Floral scent of brazilian Passiflora: five species analised by dynamic headspace
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MONTERO, DANIEL A.V.

; MARQUES, MARCIA ORTIZ M.

; MELETTI, LAURA M.M.

; KAMPEN, MARIA H. VAN

; POLOZZI, SANDRA C.

Anais da Academia Brasileira de Ciências

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Set 2016, Volume 88 Nº 3 Páginas 1191 - 1200

Resumo: En | Texto: En | PDF: En

ABSTRACT This study describes for the first time the chemical composition and olfactive description of floral scent from Brazilian Passiflora (Passiflora edulis Sim, Passiflora alata Curtis, Passiflora cincinnata Mast., Passiflora coccinea Aubl. and Passiflora quadrangularis L.). Five species were grown in greenhouse at the Agronomic Institute (IAC), São Paulo, Brazil. Volatile compounds were collected using dynamic headspace. Analyses of scent composition were performed by gas chromatograph coupled to mass spectrometer. Identification of chemical constituents was conducted through of retention index followed by comparative analysis of mass spectra with specialized databases. The olfactive descriptions of floral scent from each species was evaluated for a professional perfumer. High interspecific diversity was found between chemical compositions of floral scent within Passiflora and different bouquets were observed amount the studied species. Mayor constituents were linalool (P. alata), geraniol (P. quadrangularis), 1,4-dimethoxybenzene (P. edulis), benzaldehyde (P. cincinnata) and 2-methyl-3-pentanone (P. coccinea).

https://doi.org/10.1590/0001-3765201620150285 2448 downloads

10.

Functional diversity of reproductive traits increases across succession in the Atlantic forest
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Warring, Bianca

; Cardoso, Fernanda Cristina Gil

; Marques, Marcia C.M.

; Varassin, Isabela Galarda

Rodriguésia

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Jun 2016, Volume 67 Nº 2 Páginas 321 - 333

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

Resumo As florestas apresentam um enriquecimento gradual de espécies e um aumento em complexidade estrutural e funcional durante a sucessão. Este trabalho caracterizou os traços reprodutivos de plantas relacionados à polinização e à dispersão em um gradiente sucessional, em uma área de Mata Atlântica, Sul do Brasil. O levantamento das espécies foi realizado em áreas florestais sucessionais oriundas de regeneração natural, em idades variando entre 2 e 80 anos após o abandono da pastagem. Houve predominância de flores polinizadas por abelhas, abertas, hermafroditas e que disponibilizam o pólen como em todos estádios sucessionais. Os sistemas de polinização abiótico e misto, sistema sexual dióico, espécies com dispersão abiótica, com muitas sementes e sementes pequenas diminuíram com a idade das florestas. Espécies polinizadas por abelhas, flores com corola funil/sino, como de corola pequena e andróginas assim como espécies dispersas bioticamente e com sementes grandes aumentaram no gradiente sucessional. A riqueza funcional e a dispersão funcional aumentaram no gradiente sucessional. As mudanças da diversidade funcional foram relacionadas com o aumento da riqueza de espécies indicando que o enriquecimento de espécies em florestas mais velhas adicionou novos conjuntos de traços reprodutivos. Estas mudanças de distribuição de traços e de diversidade funcional no gradiente sucessional sugerem um incremento do papel de interações bióticas na estruturação de assembleias de plantas de florestas tropicais secundárias.

Abstract Niche and neutral processes shape community assembly with a possible shift of niche and neutral importance in communities undergoing temporal changes during succession. Functional diversity helps to discriminate assembly processes since trait distribution is dependent on those processes. We evaluated the changes in reproductive traits related to pollination and seed dispersal in a successional gradient in an Atlantic Forest area, Southern Brazil. We surveyed forests undergoing regeneration varying in age from 2 to 80 years after pasture abandonment. We expected an increase in functional diversity of reproductive traits and a greater role of limiting similarity across succession. Abiotic and mixed pollination systems, dioecious sexual system, biotic dispersed, many-seeded and small-seeded species decreased as the forest got older. Conversely, bee-pollinated, bell-shaped, small and androgynous flowers increased across forest succession as well biotic dispersed and large-seeded species. Functional richness and functional dispersion were higher in older forests. Changes in functional diversity were positively related to species richness, indicating that species enrichment in older forests added new sets of reproductive traits. These changes in trait distribution and functional diversity across succession in the Atlantic Forest suggest an increased role of biotic interactions and limiting similarity process structuring plant assemblages of second-growth tropical forests.

https://doi.org/10.1590/2175-7860201667204 13423 downloads

11.

Low-intensity laser phototherapy enhances the proliferation of dental pulp stem cells under nutritional deficiency
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MOURA-NETTO, Cacio

; FERREIRA, Leila Soares

; MARANDUBA, Carlos Magno

; MELLO-MOURA, Anna Carolina Volpi

; MARQUES, Marcia Martins

Brazilian Oral Research

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2016, Volume 30 Nº 1 elocation e80

Resumo: En | Texto: En | PDF: En

Abstract Dental trauma in immature permanent teeth can damage pulp vascularization, which leads to necrosis and cessation of apexogenesis. Studies on tissue engineering using stem cells from human exfoliated deciduous teeth (SHEDs) have yielded promising results. Laser phototherapy (LPT) is able to influence the proliferation and differentiation of these cells, which could improve tissue engineering. SHEDs (eighth passage) were seeded into 96-well culture plates (103 cells/well) and were grown in culture medium supplemented with 15% defined fetal bovine serum (FBS) for 12 h. After determining the appropriate nutrition deficiency status (5% FBS), the cells were assigned into four groups: 1) G1 – 15% FBS (positive control); 2) G2 – 5% FBS (negative control); 3) G3 – 5% FBS+LPT 3 J/cm2; and 4) G4 – 5% FBS+LPT 5 J/cm2. For the LPT groups, two laser irradiations at 6 h intervals were performed using a continuous wave InGaAlP diode laser (660 nm, with a spot size of 0.028 cm2, 10 mW) in punctual and contact mode. Cell viability was assessed via an MTT reduction assay immediately after the second laser irradiation (0 h) and 24, 48, and 72 h later. We found that G3 and G4 presented a significantly higher cell growth rate when compared with G2 (p < 0.01). Moreover, G4 exhibited a similar cell growth rate as G1 throughout the entire experiment (p > 0.05). These findings indicate that LPT with 5 J/cm2 can enhance the growth of SHEDs during situations of nutritional deficiency. Therefore, LPT could be a valuable adjunct treatment in tissue engineering when using stem cells derived from the dental pulp of primary teeth.

https://doi.org/10.1590/1807-3107BOR-2016.vol30.0080 2829 downloads

12.

Glandular trichome density and essential oil composition in leaves and inflorescences of Lippia origanoides Kunth (Verbenaceae) in the Brazilian Cerrado
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Tozin, Luiz R.S.

; Marques, Marcia O.M.

; Rodrigues, Tatiane M.

Anais da Academia Brasileira de Ciências

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Jun 2015, Volume 87 Nº 2 Páginas 943 - 953

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

Os óleos essenciais de folhas e inflorescências de Lippia origanoides Kunth apresentam potencial aromático e medicinal e têm sido utilizados no tratamento de diversas doenças, incluindo melanoma. No Brasil, L. origanoides é comumente encontrada no campo cerrado e no cerrado stricto sensu, fisionomias caracterizadas principalmente pelas diferentes condições de luminosidade às quais as plantas de médio e pequeno porte estão sujeitas. Nosso objetivo foi investigar a densidade de tricomas glandulares e o rendimento e a composição química do óleo essencial em folhas e inflorescências de L. origanoides do campo cerrado e do cerrado stricto sensu. Para análise de densidade glandular, folhas e inflorescências foram processadas segundo técnicas convencionais em microscopia eletrônica de varredura. Os óleos essenciais de folhas e inflorescências foram obtidos por hidrodestilação e identificados com cromatografia gasosa. Brácteas e sépalas mostraram a maior densidade glandular, seguidas por pétalas e folhas. A densidade glandular na face abaxial do limbo foliar foi maior em indivíduos do campo cerrado. Em ambas as fisionomias, o rendimento de óleos essenciais foi maior nas inflorescências em comparação com folhas. A composição química dos óleos essenciais variou entre os indivíduos de diferentes áreas e entre indivíduos da mesma população. Nossos resultados demonstraram a plasticidade química de L. origanoides sugerindo a importância do monitoramento de seu uso popular.

The essential oils from leaves and inflorescences of Lippia origanoides Kunth present aromatic and medicinal potential and have been used to treat several diseases, including melanoma. In Brazil, L. origanoides is commonly found in campo cerrado and cerrado stricto sensu, physiognomies featured mainly by the differential light conditions to which short and medium-sized plants are subjected. Our aim was to investigate the glandular trichome density and the yield and chemical composition of the essential oils in leaves and inflorescences of L. origanoides from campo cerrado and cerrado stricto sensu. For glandular density analysis, leaves and inflorescences were processed according to conventional techniques for scanning electron microscopy. The essential oils of leaves and inflorescences were obtained by hydrodistillation and identified with gas chromatography. Bracts and sepals showed the highest glandular density, followed by petals and leaves. The glandular density in the abaxial leaf surface was higher in individuals from the campo cerrado. In both populations the essential oil yield was higher in inflorescences than in leaves. The chemical composition of the essential oils varied among individuals from different areas and inside a same population. Our results demonstrated the chemical plasticity of L. origanoides suggesting the importance of monitoring its popular use.

https://doi.org/10.1590/0001-3765201520140376 3835 downloads

13.

Characterization of the chemical composition of the essential oils from Annona emarginata (Schltdl.) H. Rainer 'terra-fria' and Annona squamosa L.
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Campos, Felipe Girotto

; Baron, Daniel

; Marques, Marcia Ortiz Mayo

; Ferreira, Gisela

; Boaro, Carmen Silvia Fernandes

Revista Brasileira de Fruticultura

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2014, Volume 36 Nº spe1 Páginas 202 - 208

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

O objetivo do presente estudo foi caracterizar a composição química do óleo essencial das folhas de Annona emarginata (Schltdl.) H. Rainer 'terra-fria' e Annona squamosa L. As espécies foram cultivadas em casa de vegetação, com aplicação semanal de solução nutritiva até completar 18 meses, quando se realizaram a colheita e a secagem das folhas para a extração do óleo essencial, analisado por cromatografia gasosa acoplada à espectrometria de massas, para estudo dos perfis químicos. Onze substâncias majoritárias foram encontradas no óleo essencial de A. emarginata: (E)-cariofileno-29,29%; (Z)-cariofileno-16,86%; γ-muroleno-7,54%; α-pineno-13,86%; tricicleno-10,04%. No óleo de A. squamosa, 10 substâncias foram detectadas, entre elas: (E)-cariofileno-28.71%; (Z)-cariofileno-14,46%; α-humuleno-4,41%; canfeno-18,10%; α-pineno-7,37%, e β-pineno-8,71%; longifoleno-5,64%; majoritárias. (E)-cariofileno; (Z)-cariofileno; α-humuleno; canfeno; α-pineno, e β-pineno foram as seis substâncias comuns às duas espécies.

The objective of this study was to characterize the chemical composition of the essential oil from the leaves of Annona emarginata (Schltdl.) H. Rainer 'terra-fria' and Annona squamosa L. The species were grown in a greenhouse for 18 months, which nutrient solution was applied weekly; the plants were then harvested and the leaves dried to extract the essential oil. The essential oil was analyzed by gas chromatography and mass spectrometry to study its chemical profiles. Eleven substances were found in the essential oil of A. emarginata, primarily (E)-caryophyllene (29.29%), (Z)-caryophyllene (16.86%), γ-muurolene (7.54%), α-pinene (13.86%), and tricyclene (10.04%). Ten substances were detected in the oil from A. squamosa, primarily (E)-caryophyllene (28.71%), (Z)-caryophyllene (14.46%), α-humulene (4.41%), camphene (18.10%), α-pinene (7.37%), β-pinene (8.71%), and longifolene (5.64%). Six substances were common to both species: (E)-caryophyllene, (Z)-caryophyllene, α-humulene, camphene, α-pinene, and β-pinene.

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14.

Effect of laser phototherapy in the prevention and treatment of chemo-induced mucositis in hamsters
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Lopez, Talita Christine Camilo

; Martins, Manoela Domingues

; Pavesi, Vanessa Christina Santos

; Ferreira, Leila Soares

; Bussadori, Sandra Kalil

; Moreira, Maria Stella

; Marques, Marcia Martins

Brazilian Oral Research

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Jul 2013, Volume 27 Nº 4 Páginas 342 - 348

Resumo: En | Texto: En | PDF: En

The aim of this study was to investigate the effect of laser phototherapy (LPT) in the prevention and/or treatment of oral mucositis induced by 5-fluorouracil (5-FU; Eurofarma, São Paulo, Brazil) in hamsters. Ninety-six hamsters were divided into four groups (n = 24): Control (no treatment); Preventive [LPT from day (D) D-5 to D+5]; Therapeutic (LPT from D+5 to D+15); and Combined (preventive plus therapeutic LPT from D-5 to D+15). The animals received an intraperitoneal injection of 5-FU on Days 0 and 2. The pouch mucosa was scratched on Days 3 and 4. The irradiation parameters were: indium-gallium-aluminum-phosphide (InGaAlP) diode laser (MM Optics, São Carlos, Brazil) (660 nm), beam area of 0.036 cm2, 40 mW, 1.11 W/cm2, 6.6 J/cm2, power density applied daily of 39.6 J/cm2, in punctual mode (six points and six seconds per point) and contact mode, one application per day. The animals were sacrificed on Days 0, 5, 10 and 15 (n = 6) and weighed, and the pouch mucosa was removed for histopathological analysis. Clinical and corresponding histological scores were compared using ANOVA and Tukey's test (p ≤0.05). Similar weight losses ranging from 5% to 10% occurred in all groups. The therapeutic group had significantly lower clinical and histological scores than the other groups at Day 10. This study showed that positive effects on oral mucositis management were obtained only when LPT was applied in the therapeutic protocol (from D+5 to D+15 after chemotherapy).

https://doi.org/10.1590/S1806-83242013005000019 3060 downloads

15.

Influence of prior 810-nm-diode intracanal laser irradiation on hydrophilic resin-based sealer obturation
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Moura-Netto, Cacio

; Palo, Renato Miotto

; Camargo, Samira Esteves Afonso

; Jent, Carol

; Leonardo, Renato de Toledo

; Marques, Marcia Martins

Brazilian Oral Research

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Ago 2012, Volume 26 Nº 4 Páginas 323 - 329

Resumo: En | Texto: En | PDF: En

Dentin wall structural changes caused by 810-nm-diode laser irradiation can influence the sealing ability of endodontic sealers. The objective of this study was to evaluate the apical leakage of AH Plus and RealSeal resin-based sealers with and without prior diode laser irradiation. Fifty-two single-rooted mandibular premolars were prepared and divided into 4 groups, according to the endodontic sealer used and the use or non-use of laser irradiation. The protocol for laser irradiation was 2.5W, continuous wave in scanning mode, with 4 exposures per tooth. After sample preparation, apical leakage of 50% ammoniacal silver nitrate impregnation was analyzed. When the teeth were not exposed to irradiation, the RealSeal sealer achieved the highest scores, showing the least leakage, with significant differences at the 5% level (Kruskal-Wallis test, p = 0.0004), compared with AH Plus. When the teeth were exposed to the 810-nm-diode laser irradiation, the sealing ability of AH Plus sealer was improved (p = 0282). In the RealSeal groups, the intracanal laser irradiation did not interfere with the leakage index, showing similar results in the GRS and GRSd groups (p = 0.1009).

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