Search results for "Phleum"

showing 5 items of 15 documents

<b>ANTIMICROBIAL DITERPENOID ALKALOIDS FROM <i>ERYTHROPHLEUM SUAVEOLENS</i> (GUILL. & PERR.) BRENAN</b>

2005

An investigation of the stem bark of Erythrophleum suaveolens (Guill. & Perr.) Brenan yielded the known amide norcassaide ( 1 ) and a new diterpenoid alkaloid named norerythrosuaveolide ( 2 ) which was characterized as 7β-hydroxy-7-deoxo-6-oxonorcassaide. The structures were established on the basis of one and two-dimensional 1 H and 13 C NMR spectral data. The compounds showed potent antimicrobial activities against bacteria and yeasts. KEY WORDS: Erythrophleum suaveolens (Guill. & Perr.) Brenan, Norcassaide, Diterpenoid alkaloid, Norerythrosuaveolide, Antimicrobial activities, Bacteria, Yeasts Bull. Chem. Soc. Ethiop. 2005, 19(2), 221-226.

Stem barkbiologyTraditional medicineChemistryStereochemistryErythrophleum suaveolensGeneral ChemistryAntimicrobialbiology.organism_classificationSpectral dataTerpenoidBulletin of the Chemical Society of Ethiopia
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Reduced in vitro T-cell responses induced by glutaraldehyde-modified allergen extracts are caused mainly by retarded internalization of dendritic cel…

2012

Summary Although allergen-specific immunotherapy is a clinically effective therapy for IgE-mediated allergic diseases, the risk of IgE-mediated adverse effects still exists. For this reason, chemically modified allergoids have been introduced, which may destroy IgE-binding sites while T-cell activation should be retained. The aim of the study was to analyse the differences between intact allergens and differently modified/aggregated allergoids concerning their internalization as well as T-cell and basophil activation. For this purpose human monocyte-derived immature dendritic cells (DC) were incubated with Phleum pratense or Betula verrucosa pollen extract or with the corresponding allergoi…

biologyT cellmedicine.medical_treatmentmedia_common.quotation_subjectImmunologyImmunotherapybiology.organism_classificationEpitopeIn vitroPhleumchemistry.chemical_compoundBasophil activationmedicine.anatomical_structureBiochemistrychemistrymedicineImmunology and AllergyGlutaraldehydeInternalizationmedia_commonImmunology
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An approach to erythrophleum alkaloids. Synthesis of methyl (−)-4-epi-cassamate

1986

Abstract A synthetic approach to Erythrophleum alkaloids, involving as a key-step the regiospecific deprotonation of the ketone 5a, is described.

chemistry.chemical_classificationKetonebiologyChemistryStereochemistryAlkaloidErythrophleumOrganic Chemistrybiology.organism_classificationBiochemistrychemistry.chemical_compoundDeprotonationDrug DiscoveryOrganic chemistryEpimerStereoselectivityEnantiomerDiterpeneTetrahedron Letters
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Defoliation and the availability of currently assimilated carbon in the Phleum pratense rhizosphere

2002

Abstract It has been hypothesised that defoliation and aboveground herbivory increase the availability of currently assimilated C to organisms living in plant rhizospheres. We established a growth chamber experiment consisting of Phleum pratense individuals growing in sand culture to examine the short- and long-term effects of defoliation on the availability of current C assimilates in the P. pratense rhizosphere. Using 14CO2 pulse labelling, we followed partitioning of currently assimilated C between shoots, roots and rhizosphere-derived organic matter (RDOM). The experiment constituted of two treatments, defoliation history and recent defoliation, in a fully factorial design. Defoliation …

chemistry.chemical_classificationRhizosphereHerbivoreBiogeochemical cyclebiologySoil Sciencebiology.organism_classificationMicrobiologyDecomposerPhleumchemistryAgronomyShootBotanyOrganic matterPoaceaeSoil Biology and Biochemistry
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Antioxidant stilbenoid and flavanonol from stem ofErythrophleum suaveolens(Guill. & Perr.)

2015

Keywords: NMR; 1H NMR; Caesalpiniaceae; Erythrophleum suaveolens; flavanonol; stilbenoid; radical scavenging activity

chemistry.chemical_compoundAntioxidantbiologyChemistrymedicine.medical_treatmentErythrophleum suaveolensmedicineOrganic chemistryGeneral Materials ScienceFlavanonolGeneral ChemistryStilbenoidbiology.organism_classificationMagnetic Resonance in Chemistry
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