Polar Action
Mostrando 1-12 de 92 artigos, teses e dissertações.
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1. Metabolization of Insecticidal Amides from Leaves of Piper tuberculatum by Heraclydes hectorides and Naupactus bipes
Amides have been recognized as potent insecticidal natural products but, despite their variety of targets and mechanisms of action, their metabolic fate in insects is virtually unknown. The currently accepted hypothesis is that specialist herbivores are capable of biotransforming xenobiotics rendering them more polar and excretable while generalist insects d
J. Braz. Chem. Soc.. Publicado em: 2020-04
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2. Morphological and Chemical Effects of Plasma Treatment with Oxygen (O2) and Sulfur Hexafluoride (SF6) on Cellulose Surface
Cellulose is a polymer widely available in nature, however its applications may be restrict due to its hydrophilic character. The creation of hierarchical structures on the surface is one of the required factors to obtain the hydrophobicity of this material. In order to compare the morphological and chemical effects caused by the action of different gases in
Mat. Res.. Publicado em: 01/02/2018
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3. Anti-Trypanosoma Activity and Synergistic Effects of Natural and Semi-Synthetic Triterpenes and Predominant Cell Death through Autophagy in Amastigote Forms
Chagas' disease is a parasitic disease with unsatisfactory treatment, mainly in chronic stage. This study aimed to evaluate the trypanocidal activity and action mechanisms of α/β-amyrin and its semi-synthetic derivatives, together with four isolated natural triterpenes, tested against trypomastigote and amastigote forms. The structure-activity relationship
J. Braz. Chem. Soc.. Publicado em: 2017-12
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4. In vivo antileishmanial activity and chemical profile of polar extract from Selaginella sellowii
The polar hydroethanolic extract from Selaginella sellowii(SSPHE) has been previously proven active on intracellular amastigotes (in vitro test) and now was tested on hamsters infected with Leishmania (Leishmania) amazonensis (in vivo test). SSPHE suppressed a 100% of the parasite load in the infection site and draining lymph nodes at an intralesional dose o
Mem. Inst. Oswaldo Cruz. Publicado em: 19/02/2016
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5. Response Surface Methodology Applied in the Study of Emulsion Formulations in the Presence of Leaves of Rosemary (Rosmarinus officinalis L.) as a Source of Natural Antioxidants
The use of synthetic antioxidants in human consuming products is in disuse due to health toxic related issues. The search for substances to substitute synthetic antioxidants boosts studies concerned with the findings of sources of natural antioxidants. Thus, the aim of this work was to evaluate the use of comminuted leaves of rosemary (Rosmarinus officinalis
J. Braz. Chem. Soc.. Publicado em: 2015-10
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6. Topical anti-inflammatory activity of yacon leaf extracts
Smallanthus sonchifolius (Poepp.) H. Rob. , Asteraceae, known as yacon, is an herb that is traditionally used for the treatment of diabetes in folk medicine. However, recent studies have demonstrated that this plant has other interesting properties such as anti-microbial and anti-inflammatory actions. Thus, the purpose of this study was to evaluate the topic
Rev. bras. farmacogn.. Publicado em: 10/05/2013
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7. A simple procedure for the purification of active fractions in aqueous extracts of plants with allelopathic properties
Most studies conducted to test the allelopathic activity of plant parts have made use of water as solvent. However, the presence of polar, water-soluble substances, such as proteins and carbohydrates, tends to hamper the purification of active compounds. In this study, we present a simple purification procedure that separates the active fraction of the extra
Acta Bot. Bras.. Publicado em: 2013-03
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8. Pentaclethra macroloba tannins fractions active against methicillin-resistant staphylococcal and Gram-negative strains showing selective toxicity
The ethanol extract of the vegetal species Pentaclethra macroloba (Willd.) Kuntze, Fabaceae, was fractioned and the antibacterial activity was determined. The active ethyl acetate (ea) fraction showed activity against Gram-positive (Staphylococcus spp. and Enterococcus spp.) and Gram-negative (Pseudomonas aeruginosa, Acinetobacter spp. and Klebsiella pneumon
Revista Brasileira de Farmacognosia. Publicado em: 05/08/2011
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9. Plant Extracts as an Alternative to Control Leucoptera coffeella (Guérin-Mèneville) (Lepidoptera: Lyonetiidae)
We evaluated the effects of crude extracts from the plantain Plantago lanceolata and the bitter gourd Momordica charantia on the oviposition preference and development of the coffee leaf miner Leucoptera coffeella Guérin-Mèneville & Perrottet under laboratory and/or greenhouse conditions. The ovicidal effects of these extracts were also studied in a greenh
Neotropical Entomology. Publicado em: 2011-02
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10. Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro / Influence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstract
In short glass fiber (GF) reinforced polypropylene (PP) composites, despite of the chemically inert and non-polar nature of the matrix, the fiber-matrix interfacial integrity may be compromised in a hygrothermal active environment by the addition of maleic anhydride (MAH) molecules of the interfacial compatibilizer (PP-g-MAH). The use of organophilic nanocla
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/05/2010
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11. In vitro antimalarial activity and cytotoxicity of some selected cuban medicinal plants
Terrestrial plants have been demonstrated to be sources of antimalarial compounds. In Cuba, little is known about antimalarial potentials of plant species used as medicinals. For that reason, we evaluated the antimalarial activity of 14 plant species used in Cuba as antimalarial, antipyretic and/or antiparasitic. Hydroalcoholic extracts were prepared and tes
Revista do Instituto de Medicina Tropical de São Paulo. Publicado em: 2010-08
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12. Efeito de características estruturais da quitosana sobre sua interação com filmes de Langmuir como modelo de biomembrana / Effects from the structural characteristics of chitosan on its interaction in Langmuir films as biomembrane models.
Chitosans are polysaccharides used in medicine, pharmacy, dentistry and in the inhibition of microorganisms growth (eg. as bactericidal agent). In these applications their action should depend on the interaction with cell membranes, which is difficult to verify because isolating a membrane is not easy. An alternative is to investigate the interaction with me
Publicado em: 2010