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| Registros recuperados: 56 | |
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| Ayala Torres, Ana María. |
| Un total de 129 aislamientos bacterianos obtenidos de la micósfera de esclerocios de Claviceps gigantea se evaluaron in vitro para determinar su capacidad de inhibir el crecimiento de Fusarium graminearum, F. subglutinans y F. verticillioides patógenos a maíz. Ensayos cualitativos en confrontación dual, resultaron en la selección de 22 aislamientos bacterianos con el mayor potencial antagónico hacia una, dos o las tres especies de Fusarium. Los aislamientos se identificaron molecularmente mediante secuenciación parcial del gen 16s ADNr. Las cepas con mayor grado de antagonismo pertenecen a los géneros Bacillus y Pseudomonas. La caracterización en la producción de metabolitos potencialmente involucrados en la actividad antagónica, mostró que el 100% de las... |
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Palavras-chave: Bacillus; Pseudomonas; Biocontrol; Metabolitos secundarios; Caracterización; Secondary metabolites; Characterization; Fitopatología; Maestría. |
| Ano: 2014 |
URL: http://hdl.handle.net/10521/2299 |
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| Mila Arango, Roberta. |
| El desconocimiento de distintas plantas tóxicas y la ingesta de éstas por rebaños caprinos en temporada de sequía, ha provocado que muchos casos de intoxicación no se diagnostiquen o sean confundidos con otras causas, provocando altos índices de morbilidad y mortalidad en rebaños caprinos. El presente estudio tuvo como objetivo principal, la identificación de los metabolitos secudarios presentes en dos especies arbustivas de la Mixteca baja de Oaxaca causantes de intoxicación en cabras. Se evaluó el grado de toxicidad de estas plantas mediante un bioensayo con crustáceos, mismo que sirvió para identificar los metabolitos secundarios más perjudiciales y determinar, mediante la técnica de gas in vitro, el grado de afección en el rumen. Se evaluó un agente... |
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Palavras-chave: Caprinos; I. murucoides; I. pauciflora; Metabolitos secundarios; Toxicidad; Goats; Secondary metabolites; Toxicity; Ganadería; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1905 |
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| Petit,Philippe; Lucas,Esther M. F.; Abreu,Lucas M; Pfenning,Ludwig H; Takahashi,Jacqueline A. |
| The morphological features of a Penicillium, isolated from Brazilian cerrado soil, were characterized and showed to be distinctly different from all well-defined Penicillium species. Chemical and biological investigation on the ethyl acetate extract of this Penicillium isolate resulted in the isolation of three new naphthalenoids: a major metabolite, methyl 6-acetyl-4-methoxy-5,7,8-trihydroxynaphthalene-2-carboxylate and two minor ones, methyl 6-acetyl-4-methoxy-7,8-dihydroxynaphthalene-2-carboxylate and methyl 6-acetyl-4-methoxy-5,8-dihydroxynaphthalene-2-carboxylate. Their structures were determined based on their mono and bidimensional nuclear magnetic resonance data. Acetyl, allyl and methoxyl derivatives of the major metabolite were prepared in order... |
| Tipo: Journal article |
Palavras-chave: Antibacterial activity; Cerrado; Naphthalenoids; Penicillium; Secondary metabolites. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400008 |
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| Rubio-Piña,Jorge A; Vázquez-Flota,Felipe A. |
| RNA extraction from recalcitrant plant tissues is frequently complicated by the presence of secondary metabolites, polysaccharides and polyphenols. These compounds may co precipitate with RNA, often rendering it unsuitable for either cDNA synthesis or hybridization in northern blot analyses and therefore, interfering with the gene analysis expression in such tissues. We have developed an efficient RNA extraction method from A. mexicana tissues. The procedure includes the use of polyvinylpolypyrrolidone (PVPP), to remove secondary metabolites, proteins and polyphenols, and a two-step precipitation with LiCl, to eliminate polysaccharides, and thus increasing RNA yield. The quality of the resulting RNA was evaluated spectrophotometrically and by agarose gel... |
| Tipo: Journal article |
Palavras-chave: Argemone mexicana; Plant tissues; RNA isolation; Secondary metabolites. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400015 |
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| Cuvertino-Santoni,Jorge; Montenegro,Gloria. |
| Here, we present the current state of knowledge on the diversity of Chilean bryophytes (mosses, liverworts, and hornworts), the secondary metabolites present in these plants, and the biological activity of extracts from populations of Chilean species. Our goal is to establish the potential of these plants as a source of useful molecules for pharmaceutical and agricultural industries, thus promoting their conservation. Only 3,7% of Chilean bryophytes (55 spp.) have been analyzed using chemical characterization of their extracts (methanol, ether, ethanol, dichloromethane, acetone and hexane). Only four species from Chilean and Argentinian populations (Porella chilensis (Lehm. & Lindenb.) Trevi., Riccardiapolyclada (Mitt. ex Thurn) Hässel,... |
| Tipo: Journal article |
Palavras-chave: Mosses; Liverworts; Hornworts; Uses; Secondary metabolites; Biological activity; In vitro cultivation. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100002 |
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| Yang,Jing; Zhu,Biao; Ni,Xiaolei; He,Yong. |
| ABSTRACT Nitrogen (N) strongly affects plant growth. However, little is known about the effects of the ammonium/nitrate ratio on pakchoi (Brassica rapa), especially its glucosinolates (GSs) contents which are involved in plant defense and many of them benefit to human health. The aim of this study was to evaluate the effects of a constant N supply (8 mM) but with five ammonium/nitrate ratios (namely 0/8 mM, 2/6 mM, 4/4 mM, 6/2 mM and 8/0 mM) on the growth of pakchoi in a hydroponic system in 2 years. In both years, a higher biomass (dry weight) was in the 4/4 and 2/6 ammonium/nitrate treatments (2.3 and 2.2-fold compared to 8/0, respectively), with no significant difference in biomass between these two treatments. The biomass then decreased with increasing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica rapa; Biomass; Nitrogen form; Secondary metabolites. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000300246 |
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| Bojadzija Savic, Gorenka; Bormans, Myriam; Edwards, Christine; Lawton, Linda; Briand, Enora; Wiegand, Claudia. |
| Due to eutrophication, freshwater ecosystems frequently experience cyanobacterial blooms, many of which produce bioactive metabolites that can affect vertebrates and invertebrates life traits. Zooplankton are able to develop tolerance as a physiological response to cyanobacteria and their bioactive compounds, however, this comes with energetic cost that in turn influence Daphnia life traits and may impair populations. Vice versa, it has been suggested that Daphnia are able to reduce cyanobacterial dominance until a certain cyanobacterial density; it remains unclear whether Daphnia metabolites alone influence the physiological state and bioactive metabolites production of cyanobacteria. Hence, this study investigates mutual physiological reactions of toxic... |
| Tipo: Text |
Palavras-chave: Zooplankton; Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Oxidative stress. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00624/73653/76105.pdf |
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| Bojadzija Savic, Gorenka; Edwards, Christine; Briand, Enora; Lawton, Linda; Wiegand, Claudia; Bormans, Myriam. |
| While the intracellular function of many toxic and bioactive cyanobacterial metabolites is not yet known, microcystins have been suggested to have a protective role in the cyanobacterial metabolism, giving advantage to toxic over nontoxic strains under stress conditions. The zooplankton grazer Daphnia reduce cyanobacterial dominance until a certain density, which may be supported by Daphnia exudates, affecting the cyanobacterial physiological state and metabolites’ production. Therefore, we hypothesized that D. magna spent medium will impact the production of cyanobacterial bioactive metabolites and affect cyanobacterial photosynthetic activity in the nontoxic, but not the toxic strain. Microcystin (MC-LR and des-MC-LR) producing M. aeruginosa PCC7806 and... |
| Tipo: Text |
Palavras-chave: Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Mutant; Infochemicals. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00507/61893/65980.pdf |
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| Steffen, Ricardo Bemfica; Antoniolli, Zaida Inês; Steffen, Gerusa Pauli Kist; Jacques, Rodrigo Josemar Seminoti; Echkardt, Daniel Pazzini; dos Santos, Marcos Leandro; Santana, Natielo Almeida. |
| O estabelecimento das essências florestais exóticas pode apresentar dependência da associação ectomicorrízica, a qual eleva a resistência das mudas aos estresses iniciais após o plantio no campo, favorecendo o desenvolvimento inicial das mudas sob condições adversas. O trabalho objetivou avaliar o efeito da aplicação do óleo essencial de eucalipto na colonização ectomicorrízica e no crescimento de mudas de Eucalyptus grandis, em condições de casa de vegetação. Os tratamentos foram constituídos por cinco concentrações do óleo essencial de Eucayptus grandis e dois isolados ectomicorrízicos, além dos tratamentos controle sem inoculação. Utilizou-se delineamento experimental inteiramente casualizado com oito repetições. Noventa dias após o transplante... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ectomicorrizas; Simbiose; Metabólitos secundárioslitos secundários Ectomycorrhizae; Symbiosis; Secondary metabolites. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/260 |
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| Steffen, Ricardo Bemfica; Antoniolli, Zaida Inês; Steffen, Gerusa Pauli Kist; Jacques, Rodrigo Josemar Seminoti; da Silva, Rodrigo Ferreira. |
| The use of eucalyptus essential oil can optimize the growth of ectomycorrhizal isolates, which aid the establishment of forest species in soils contaminated by copper. The study aimed to determine the best application of eucalyptus essential oil in the formation of mycorrhizal seedlings of Eucalyptus grandis and its influence on the establishment of these seedlings in soil contaminated by copper. It was used the ectomycorrhizal fungi (fECM) Pisolithus microcarpus. The application forms of the essential oil were evaluated in a greenhouse, by means of six treatments. Subsequently, the seedlings were transplanted and evaluated in soil contaminated by copper, greenhouse and field. It was determined height, diameter, fresh and dry weight of shoots and roots,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Secondary metabolites; Ectomycorrhizal Metais pesados; Metabólitos secundários; Fungos ectomicorrízicos. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/268 |
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| Steffen, Ricardo Bemfica; Antoniolli, Zaida Inês; Steffen, Gerusa Pauli Kist; Jacques, Rodrigo Josemar Seminoti; Echkardt, Daniel Pazzini; dos Santos, Marcos Leandro; Santana, Natielo Almeida. |
| Os metabólitos secundários bioativos de algumas plantas são capazes de estimular o crescimento dos fungos ectomicorrízicos. Quando em associação com plantas, esses fungos proporcionam as mesmas condições de se desenvolverem em ambientes contaminados por metais pesados. Avaliou-se o efeito da adição de óleo essencial de Eucalyptus grandis no crescimento de isolados ectomicorrízicos na presença de cobre, zinco e níquel. Os fungos ectomicorrízicos Pisolithus microcarpus (UFSC Pt 116) e Pisolithus sp. (UFSC Pt 24) foram incubados em meio de cultura líquido na presença de concentrações crescentes de cobre, zinco e níquel e de óleo essencial de Eucalyptus grandis na concentração de 20 μL L-1. Após período de incubação de 25 dias, avaliou-se a massa seca do... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metais pesados; Metabólitos secundários; Ectomicorrizas Heavy metals; Secondary metabolites; Ectomycorrhizae.. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/259 |
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| Moreira,Márcio Dionizio; Picanço,Marcelo Coutinho; Barbosa,Luiz Cláudio de Almeida; Guedes,Raul Narciso Carvalho; Campos,Mateus Ribeiro de; Silva,Gerson Adriano; Martins,Júlio Cláudio. |
| The objective of this work was to screen plants with insecticide activity, in order to isolate, identify and assess the bioactivity of insecticide compounds present in these plants, against Coleoptera pests of stored products: Oryzaephilus surinamensis L. (Silvanidae), Rhyzopertha dominica F. (Bostrichidae) and Sitophilus zeamais Mots. (Curculionidae). The plant species used were: basil (Ocimum selloi Benth.), rue (Ruta graveolens L.), lion's ear (Leonotis nepetifolia (L.) R.Br.), jimson weed (Datura stramonium L.), baleeira herb (Cordia verbenacea L.), mint (Mentha piperita L.), wild balsam apple (Mormodica charantia L.), and billy goat weed or mentrasto (Ageratum conyzoides L.). The insecticide activity of hexane and ethanol extracts from those plants on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Natural insecticide; Pest management; Alternative control; Secondary metabolites. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000700001 |
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| HUSSAIN,M.I.; QAMAR ABBAS,S.; REIGOSA,M.J.. |
| ABSTRACT: This review covers biological activity of secondary metabolites, coumarin and their derivatives on different organisms (pests, pathogens, weeds), as well as their applications in agriculture as eco-friendly pesticides and weed control agents. Naturally occurring coumarins have shown biological and allelopathic potential on a broad range of organisms. Coumarin inhibits seed germination, root growth, morphology, histology, water uptake, respiration, photosynthesis, cell elongation, cell división and differentiation. Coumarin demonstrate excellent insecticidal potential against eggs, larvae and adult insects. Coumarin showed antifeedent responses in a wide range of memebers from invertebrates to vertebrates. The information provided in this review... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coumarin; Secondary metabolites; Multifunctionality; Herbivory; Allelopathy; Phytotoxicity; Weed control. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100220 |
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| WAHEED,K.; MUHAMMAD,S.K.; SHOMAILA,A.; MUHAMMAD,Z.; IZHAR,U.; ULLAH,S.. |
| ABSTRACT: Medicinal Plants have been used throughout the world by human beings as a drug and remedies for various diseases since time immemorial. A study was planned to count into the antimicrobial activity and phytochemical screening of Euphorbia helioscopia. The plants were gathered and tested against some standard strains and some human pathogenic microorganisms i.e Escherichia coli, Bacillus Subtilis, Staphylococcus aureus, Klebsiella pneumoniae, Salmonella typhi, Pseudomonas aeruginosa and three fungal strain Trichoderma, R hizopus nigricans, Aspergillus niger. The concentrations of extracting samples (500 and 1,000 mg mL-1) were used against pathogens. Ciprofloxacin was used as positive control in case of bacterial strains and Colfrimazol was used... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ayurvedic; Euphorbiaceae; Labeena; Secondary metabolites; Indigenous. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100211 |
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| Registros recuperados: 56 | |
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