Analise Comparativa De Metodos Numericos De Equacoes Algebrico-Diferenciais

Romeiro, Neyva Maria Lopes

doi:10.11606/d.55.2018.tde-21062018-081358

Cited by 6 publications

(9 citation statements)

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“…Os resultados negativos no ensaio de difusão em gel podem ser decorrentes de características lipofílicas dos extratos testados, pois, meio de cultura que apresenta ágar como agente solidifi cante é considerado um gel perfeito (Romeiro, 2001), meio apropriado para substâncias com características hidrofílicas.…”

Section: Discussionunclassified

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Atividade antibacteriana e antifúngica de extratos etanólicos de Aster lanceolatus Willd., Asteraceae

Dias¹,

Virtuoso²,

Davet³

et al. 2006

Rev. bras. farmacogn.

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RESUMO:Conhecida popularmente como áster-arbustiva, margarida-de-são-miguel e montecassino, Aster lanceolatus é uma planta ornamental de corte. Sabendo-se que não existem estudos que atestem a atividade biológica desta espécie, procurou-se neste trabalho atividades antibacteriana e antifúngica. Para tanto se utilizaram extratos brutos etanólicos de duas porções distintas, das fl ores e dos caules com folhas. Para a atividade antibacteriana, oito bactérias patogênicas foram submetidas a ensaio de difusão em gel e concentração inibitória mínima. Demonstrou-se atividade do extrato bruto etanólico de fl ores contra Streptococcus pyogenes, em difusão em gel e atividade de extrato bruto etanólico de caules e folhas contra Salmonella typhimurium e Streptococcus pyogenes em concentração inibitória mínima. Para a atividade antifúngica, utilizaram-se três fungos patogênicos em ensaios de crescimento micelial em placas e bioautografi a direta. No ensaio de crescimento micelial em placas verifi cou-se a inibição de Fusarium oxysporum e na bioautografi a direta, inibição do Cylindrocladium spathulatum. Os resultados delinearam uma nova fonte de pesquisa, as plantas ornamentais. Estas podem ser fonte de constituintes químicos capazes de servirem como protótipos para novos agentes terapêuticos e para tratamento sanitário de plantas medicinais. Unitermos:Aster lanceolatus, atividade antibacteriana, atividade antifúngica, difusão em gel, concentração inibitória mínima.ABSTRACT: "Antibacterial and antifungal activity of ethanolics extracts from Aster lanceolatus Willd., Asteraceae". Popularly known as aster-arbustiva, margarida-de-são-miguel and monte-cassino, Aster lanceolatus is an ornamental plant. Having the knowledge that there is no studies on the biological activity of this species, this work aimed to check the antibacterial and antifungal activities. The ethanol extracts of the fl owers and of the stems with leaves were used. For the antibacterial activity eight pathogenic bacteria were submitted to the diffusion test in gel and minimal inhibitory concentration. The activity of the ethanolic extract of the fl owers has been demonstrated against Streptococcus pyogenes in diffusion in gel and the activity of the ethanol extract of the stems and leaves against Salmonella typhimurium and Streptococcus pyogenes in minimal inhibitory concentration. For the antifungal activity, three pathogenic yeasts have been used in the micelial growth tests in plates and direct bioautography. In the micelial growth tests in plates the inhibition of Fusarium oxysporum has been verifi ed and in the direct bioautography, inhibition of the Cylindrocladium spathulatum. The results indicated a new research source, the ornamental plants. These can be the source of chemicals capable of serving as prototypes for new therapeutic agents and for sanitary treatment of medicinal plants.

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Section: Discussionunclassified

“…Para realização deste estudo, duas técnicas foram empregadas: difusão em gel, técnica adaptada de Koneman et al (1993), Romeiro (2001) e Carvalho et al (2002, e diluição em caldo para determinação da concentração inibitória mínima (CIM), técnica adaptada de Moura et al (1987) …”

Section: Avaliação Da Atividade Antibacterianaunclassified

Atividade antibacteriana e antifúngica de extratos etanólicos de Aster lanceolatus Willd., Asteraceae

Dias¹,

Virtuoso²,

Davet³

et al. 2006

Rev. bras. farmacogn.

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“…The antimicrobial activity of LGEO against pathogens was determined by standard Disk Susceptibility Tests (Botelho et al, 2007c) tested against Bacillus cereus (ATCC 33018), Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 15442), Shigella flexineri (ATCC 12022), Klebsiella pneumoniae (ATCC 10031) and Sthaphylococcus aureus (ATCC 12692) by using the agar diffusion method (Romeiro, 2001). The clinically isolated bacterial and inoculum of all strain was obtained from fresh colonies grown on Müeller Hinton agar plates.…”

Section: Antimicrobial Screening By the Disk Diffusion Methodsmentioning

confidence: 99%

Phythochemical screening and antimicrobial activity phythochemical of essential oil from Lippia gracillis

Bitu¹,

Botelho²,

Costa³

et al. 2012

Rev. bras. farmacogn.

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Abstract:The chemical composition of the essential oil obtained from the fresh and dried leaves of Lippia gracillis Schauer, Verbenaceae, was analyzed by gas chromatography and gas chromatography/mass spectrometry (GC⁄MS). The yield of essential oil extracted from the dried leaves was significantly higher (p<0.05) when compared to the fresh leaves. Seventeen components were identified. The monoterpenes and sesquiterpene hydrocarbons with 96.26% (w/w) of the total oil obtained of fresh leaves and 86.99% (w/w) of the total oil obtained of dried leaves were the principal compound groups. Thymol was observed dominant (44.42%; 21.3%), followed by carvacrol (22.21%; 21.30%), p-cymene (6.23%; 8.58%), α-pinene (5.65%; 19.42%), β-caryophyllene (5.61%; 3.57%) and other minor constitutes, respectively. Microbiological results obtained by agar diffusion method, micro dilution method and minimum inhibitory concentration (MIC) showed that the essential oil has a relevant antimicrobial activity against E. coli (ATCC 10536), E. coli (Ec 27), Pseudomonas aeruginosa (ATCC 15442), S. aureus (ATCC 12692) and S. aureus (Sa 358), with their inhibition zones ranging from 9 to 13 mm and the MIC ranging from 64 to 512 μg/mL.

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“…The plates were incubated in a bacteriological incubator at 37°C for 24 h reading of performance was done after 24 and 48 h. The sensitivity of the sample was considered: halos ≥ 10 mm. The tests were accompanied by positive control with antibiotic chloramphenicol (30 mg) and negative control with ethanol (Romeiro, 2001). …”

Section: Antibacterial Activity Of Stem Peels and Leaves Of Anacardiumentioning

confidence: 99%

Antibacterial evaluation of Anacardium occidentale (Linn) (Anacardiaceae) in semiarid Brazil

Francianne¹,

Eliss²,

lico³

et al. 2013

Afr. J. Biotechnol.

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Microorganisms that cause losses are proving to be resistant to most known antibiotics, thereby encouraging the search for naturally occurring antibiotics. This study aimed to perform a phytochemical and bacterial study of ethanolic extracts of leaves and barks of Anacardium occidentale L. The samples were submitted for extraction using ethyl alcohol; the crude extract was used to perform phytochemical evaluation based on the identification of chemical constituents and to evaluate the antibacterial activity. The results of prospective chemical indicate the presence of tannins, phenols, alkaloids and catechins in the leaves and stem bark and compounds belonging to classes of flavonoids were found only in the leaves. Tests using the agar diffusion method for later determination of minimum inhibitory concentration (MIC) revealed that both parts of the plant have antibacterial activity, but the shell showed the largest zones of inhibition in most of the concentrations and strains. The MIC ranged from 512 to ≥ 1024 μg/ml, for the two parts of this species. The results indicate the need for further studies because this plant demonstrated considerable antibacterial therapeutic potential.

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Analise Comparativa De Metodos Numericos De Equacoes Algebrico-Diferenciais

Cited by 6 publications

References 0 publications

Atividade antibacteriana e antifúngica de extratos etanólicos de Aster lanceolatus Willd., Asteraceae

Atividade antibacteriana e antifúngica de extratos etanólicos de Aster lanceolatus Willd., Asteraceae

Phythochemical screening and antimicrobial activity phythochemical of essential oil from Lippia gracillis

Antibacterial evaluation of Anacardium occidentale (Linn) (Anacardiaceae) in semiarid Brazil

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