71 research outputs found
Introgression of the sesquiterpene biosynthesis from <i>Solanum habrochaites</i> to cultivated tomato offers insights into trichome morphology and arthropod resistance
Action Of Essential Oils From Brazilian Native And Exotic Medicinal Species On Oral Biofilms
Background: Essential oils (EO) obtained from twenty medicinal and aromatic plants were evaluated for their antimicrobial activity against the oral pathogens Candida albicans, Fusobacterium nucleatum, Porphyromonas gingivalis, Streptococcus sanguis and Streptococcus mitis. Methods: The antimicrobial activity of the EO was evaluates by microdilution method determining Minimal Inhibitory Concentration. Chemical analysis of the oils compounds was performed by Gas chromatography-mass spectrometry (CG-MS). The most active EO were also investigated as to their actions on the biolfilm formation. Results: The most of the essential oils (EO) presented moderate to strong antimicrobial activity against the oral pathogens (MIC - Minimal Inhibitory Concentrations values between 0.007 and 1.00mg/mL). The essential oil from Coriandrum sativum inhibited all oral species with MIC values from 0.007 to 0.250mg/mL, and MBC/MFC (Minimal Bactericidal/Fungicidal Concentrations) from 0.015 to 0.500mg/mL. On the other hand the essential oil of C. articulatus inhibited 63.96% of S. sanguis biofilm formation. Through Scanning Eletronic Microscopy (SEM) images no changes were observed in cell morphology, despite a decrease in biofilm formation and changes on biofilm structure. Chemical analysis by Gas Chromatography - Mass Spectrometry (GC-MS) of the C. sativum essential oil revealed major compounds derivatives from alcohols and aldehydes, while Cyperus articulatus and Aloysia gratissima (EOs) presented mono and sesquiterpenes. Conclusions: In conclusion, the crude oil from C. articulatus exhibited the best results of antimicrobial activity e ability to control biofilm formation. The chemical analysis showed the presence of terpenes and monoterpenes such as a-pinene, a-bulnesene and copaene. The reduction of biofilms formation was confirmed from SEM images. The results of this research shows a great potential from the plants studied as new antimicrobial sources.141Kolenbrander, P.E., Oral microbial communities: biofilms, interactions, and genetic systems (2000) Annu Rev Microbiol, 54, pp. 413-437Spratt, P.A., Pratten, J., Biofilms and the oral cavity (2003) Rev Environ Sci Biotechnol, 2, pp. 463-467Kolembrander, P.E., Multispecies communities: interspecies interactions influence growth on saliva as sole nutritional source (2011) Int J Oral Sci, 3, pp. 49-54Marsh, P.D., Dental plaque: biological significance of a biofilm and community life-style (2005) J Clin Periodontol, 32, pp. 7-15Bernimoulin, J.P., Recent concepts in plaque formation (2003) J Clin Periodontol, 30, pp. 7-9Marsh, P.D., Are dental diseases examples of ecological catastrophes? (2003) Microbiology, 149, pp. 279-294Filoche, S.K., Soma, K., Sissons, C.H., Antimicrobial effects of essencial oils in combination with chlorexidine digluconate (2005) Oral Microbiol Immunol, 20, pp. 221-225Rosenthal, S., Spangberg, L., Safavi, K., Conn, F., Chlorhexidine substantivity in root canal dentin (2004) Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 98, pp. 488-492Zheng, C.Y., Wang, Z.H., Effects of chlorhexidine, listerine and fluoride listerine mouthrinses on four putative root-caries pathogens in the biofilm (2011) Chin J Dent Res, 14, pp. 135-140Lang, G., Buchbauer, G., A review on recent research results (2008-2010) on essential oils as antimicrobials and antifungals (2012) Rev Flavour Fragr J, 27, pp. 13-39Calsamiglia, S., Busquet, M., Cardozo, P.W., Castillejos, L., Ferret, A., Invited review: essential oils as modifiers of rúmen microbial fermentation (2007) J Dairy Sci, 6, pp. 2580-2595Khan, A., Ahmad, A., Akhtar, F., Yousuf, S., Xess, I., Khan, L.A., Manzoor, N., Induction of oxidative stress as a possible mechanism of the antifungal action of three phenylpropanoids (2011) FEMS Yeast Res, 11, pp. 114-122Cha, J.D., Jeong, M.R., Jeong, S.I.I., Moon, S.E., Kil, B.S., Yun, S.I.I., Lee, K.Y., Song, Y.H., Chemical composition and antimicrobial activity of the essential oil of Cryptomeria japonica (2007) Phytother Res, 21, pp. 295-299Maggi, F., Cacchini, C., Cresci, A., Coman, M.M., Tirillini, B., Sagratini, G., Papa, F., Vittori, S., Chemical composition and antimicrobial activity of Hypericum hircinum L. Subsp. majus essential oil (2010) Chem Nat Compd, 1, pp. 125-129Nascimento, P.F.C., Alviano, W.S., Nascimento, A.L.C., Santos, P.O., Arrigoni-Blank, M.F., Jesus, R.A., Azevedo, V.G., Trindade, R.C., Hyptis pectinata essential oil: chemical composition and anti-Streptococcus mutans activity (2008) Oral Dis, 14, pp. 485-489Gorelov, V.E., Aksel'rod, L.S., Migalisnkaya, L.N., An investigation of the hydraulics and effectiveness of fractionation columns with sieve packing (1971) Chem Petrol Eng, 7, pp. 211-214Duarte, M.C.T., Figueira, G.M., Sartoratto, A., Rehder, V.L., Delarmelina, C., Anti-Candida activity of Brazilian medicinal plants (2005) J Ethnopharmacol, 97, pp. 305-311Adams, R.P., (2007) Identification of Essential Oils Components by Gas Chromatography/Mass Spectrometry, 4. , USA: Allured publishing Edited by Carol Stream Ill(2002) Methods for Dilution Antimicrobial Susceptibility Tests for yeast, , Approved Standard CLSI document M27-A2. Volume 22 2nd edition. Edited by: FortWayne Ind USA(2005) Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically, , In Approved Standard CLSI document M07-A6. Volume 26 6th edition. Edited by: FortWayne Ind USAHafidh, R.R., Abdulamir, A.S., Vern, L.S., Bakar, F.A., Abas, F., Jahanshiri, F., Sekawi, Z., Inhibition of growth of highly resistant bacterial and fungal pathogens by a natural product (2011) Open Microbiol J, 5, pp. 96-106Niu, C., Gilbert, E.S., Colorimetric method for identifying plant essential Oil components that affect biofilm formation and structure (2004) Appl Environ Microbiol, 70, pp. 6951-6956Djordjevic, D., Wiedmann, M., McLandsborough, L.A., Microtiter plate assay for assessment of Listeria monocytogenes biofilm formation (2002) Appl Environ Microbiol, 68, pp. 2950-2958Hawser, S.P., Douglas, L.J., Biofilm formation by Candida species on the surface of catheter materials in vitro (1994) Infect Immun, 62, pp. 915-921Furletti, V.F., Teixeira, I.P., Obando-Pereda, G., Mardegan, R.C., Sartoratto, A., Figueira, G.M., Duarte, R.M.T., Höfling, J.F., Action of Coriandrum sativum L. essential oil upon oral Candida albicans biofilm formation (2011) Evid Based Complement Alternat Med, pp. 1-9. , http://dx.doi.org/10.1155/2011/985832Oladusu, I.A., Usman, L.A., Olawore, N.O., Atata, R.F., Antibacterial activity of rhizomes essential oils of types of Cyperus articulatus Growing in Nigeria (2011) Ad Bio Res, 5, pp. 179-183Botelho, M.A., Nogueira, N.A.P., Bastos, G.M., Fonseca, S.G.C., Lemos, T.L.G., Matos, F.J.A., Montenegro, D., Brito, G.A.C., Antimicrobial activity of the essential oil from Lippia sidoides, carvacrol and thymol against oral pathogens (2007) Braz J Med Biol Res, 40, pp. 349-356Donlan, R.M., Costerton, J.W., Biofilms: survival mechanisms of clinically relevant microorganisms (2002) Clin Microbiol Rev, 15, pp. 167-193Hope, C.K., Wilson, M., Analysis of the effects of chlorhexidine on oral-biofilm vitality and structure based on viability profiling and an indicator of membrane integrity (2004) Antimicrob Agents Ch, 48, pp. 1461-1468Chandra, J., Antifungal resistance of Candida biofilms formed on denture acrylic in vitro (2003) J Dent Res, 80, pp. 903-908Hendry, E.R., Worthington, T., Conway, B.R., Lambert, P.A., Antimicrobial efficacy of eucalyptus oil and 1,8-cineole against microorganisms grow in planktonic and biofilm cultures (2009) J Antimicrob Chemother, 64, pp. 1219-1225Carson, C.F., Me, B.J., Riley, T.V., Mechanism of action of Melaleuca alternifolia (tea tree) oil on Staphylococcus aureus determined by time-kill, lysis, leakage, and salt tolerance assays and electron microscopy (2002) Antimicrob Agents Chemother, 46, pp. 1914-1920Martins, A., Salgueiro, L.R., Gonçalves, M.J., Proença, S.C., Vila, A., Canigueral, R., Essential oil composition and antimicrobial activity of Santiria trimera bark (2003) Planta Med, 69, pp. 77-79Galvão, L.C.C., Furletti, V.F., Bersan, S.M.F., Cunha, M.G., Ruiz, A.L.T.G., Carvalho, J.E., Sartoratto, A., Rosalen, P.L., Antimicrobial activity of essential oils against streptococcus mutans and their antiproliferative effects (2012) J Evid Based Complementary Altern Med, 40, pp. 1-12Douglas, L.J., Candida biofilms and their role in infection (2004) Trends Microbiol, 11, pp. 30-36Begnami, A.F., Duarte, M.C.T., Furletti, V., Rehder, V.L.G., Antimicrobial potential of Coriandrum sativum L. against different Candida species in vitro (2010) Food Chem, 118, pp. 74-77Dorman, H., Deans, S., Antimicrobial agents from plants: antibacterial activity of plant volatile oils (2000) J Appl Microbiol, 88, pp. 308-316Mercier, B., Prost, J., Prost, M., The essential oil of turpentine and its major volatile fraction (alpha-and beta-pinenes): a review (2009) Int J Occup Med Environ Health, 22, pp. 331-342Delaquis, P.J., Stanich, K., Girard, B., Mazza, G., Antimicrobial activity of individual and mixed fractions of dill, cilantro, coriander and eucalyptus essential oils (2001) Int J Food Microbiol, 74, pp. 101-109Kim, K., Kim, Y., Yu, H., Jeong, S., Cha, J., Kil, B., You, Y., Antibacterial activity and chemical composition of essential oil of Chrysanthemun boreal (2003) Planta Med, 69, pp. 274-277Silva, F., Ferreira, S., Queiroz, J.A., Domingues, F.C., Coriander (Coriandrum sativum L.) essential oils: its antibacterial activity and mode of action evaluated by flow cytometry (2011) J Med Microbiol, 60, pp. 1479-1486Khan, A., Ahmad, A., Akhtar, F., Yousuf, S., Xess, I., Khan, L.A., Manzoor, N., Ocimum sanctum essential oil and its active principles exert their antifungal activity by disrupting ergosterol biosynthesis and membrane integrity (2010) Res Microbiol, 161, pp. 816-823Pavithra, P.S., Sreevidya, N., Verma, R.S., Antibacterial activity and chemical composition of essential oil of Pamburus missionis (2009) J Ethnopharmacol, 124, pp. 151-153Magwa, M.L., Gundidza, M., Gwerua, N., Humphrey, G., Chemical composition and biological activities essential oil from the leaves of Sesuvium portulacastrum (2006) J Ethnopharmacol, 103, pp. 85-8
Determinantes e conseqüências da insegurança alimentar no Amazonas: a influência dos ecossistemas
Genotype × country interaction for weaning weight in the Angus populations of Brazil and Uruguay
Estudo da interação genótipo × ambiente sobre caracterÃsticas de crescimento de bovinos de corte utilizando-se inferência bayesiana
Accretion, Outflows, and Winds of Magnetized Stars
Many types of stars have strong magnetic fields that can dynamically
influence the flow of circumstellar matter. In stars with accretion disks, the
stellar magnetic field can truncate the inner disk and determine the paths that
matter can take to flow onto the star. These paths are different in stars with
different magnetospheres and periods of rotation. External field lines of the
magnetosphere may inflate and produce favorable conditions for outflows from
the disk-magnetosphere boundary. Outflows can be particularly strong in the
propeller regime, wherein a star rotates more rapidly than the inner disk.
Outflows may also form at the disk-magnetosphere boundary of slowly rotating
stars, if the magnetosphere is compressed by the accreting matter. In isolated,
strongly magnetized stars, the magnetic field can influence formation and/or
propagation of stellar wind outflows. Winds from low-mass, solar-type stars may
be either thermally or magnetically driven, while winds from massive, luminous
O and B type stars are radiatively driven. In all of these cases, the magnetic
field influences matter flow from the stars and determines many observational
properties. In this chapter we review recent studies of accretion, outflows,
and winds of magnetized stars with a focus on three main topics: (1) accretion
onto magnetized stars; (2) outflows from the disk-magnetosphere boundary; and
(3) winds from isolated massive magnetized stars. We show results obtained from
global magnetohydrodynamic simulations and, in a number of cases compare global
simulations with observations.Comment: 60 pages, 44 figure
Estimativas de parâmetros genéticos e de ganhos direto e indireto à seleção para caracterÃsticas de crescimento de machos e fêmeas da raça Canchim
Alternatives for analysis of performance data and ranking of Charolais x Nellore crossbred bulls in performance tests
Avaliação do crescimento de tecidos e órgãos de novilhos mestiços Holandês-Gir durante o ganho compensatório. 1. Carcaça
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