Showing papers in "Phytochemistry in 1987"

TL;DR: The scavenging activity of flavonoids decreases in the order: myricetin > quercetin> rhamnetin > morin > diosmetin > naringenin > apigenin > catechin > 5,7- dihydroxy -3′,4′,5′-trimethoxyflavone > robinin > kaempferol > flavone as discussed by the authors.

TL;DR: (−)-Epigallocatechin, an antibiotic found in Elaeagnus glabra, and 28 other related plant flavonoids were tested for their antibacterial activity against Proteus vulgaris and Staphylococcus aureus.

TL;DR: The enzyme seems to be important in assimilation of ammonia under stress conditions such as dark starvation, high temperature, salinity, water stress, environmental pollution, senescence and other abnormalities.

TL;DR: The 11S and 7S proteins are modified during the early stages of proteolysis and the effects of these modifications on the regulation of breakdown are examined and a scheme for 11S protein degradation in germinating seeds is presented.

TL;DR: It appears that glucan synthase, a membrane-bound enzyme, is as susceptible to phenolic effects as cytosolic enzymes and in situ inactivation is a function of the availability of both endogenous phenolics and PPO.

TL;DR: In this article, the inhibition of β-glucosidase by natural polyphenolic substrates is described and the kinetic data suggest that the pattern of inhibition is variable.

TL;DR: Root cultures of Senecio vulgaris synthesize pyrrolizidine alkaloids which are accumulated in the form of their N -oxides, and Senecionine N -oxide is found to be the primary product of biosynthesis.

TL;DR: Sequential partitioning of aqueous extracts against a series of solvents of increasing polarity separated the most active compounds in the Et2O fraction based on a cress root growth assay, revealing two new phytotoxic compounds in rye.

TL;DR: The 13C NMR spectra of a range of amentoflavone and hinokiflavone biflavonoids are reported, most for the first time as mentioned in this paper.

TL;DR: The Deuteromycete Trichothecium roseum produces significant amounts of mycosporine glutaminol during its sporulation phase and this production is improved when glucose is substituted by quinic acid in the culture medium.

TL;DR: The triterpenes have been investigated in the aerial part and the latex of Euphorbia broteri and contain a new triterpene, 25,26,27-trisnor-3β-hydroxy-24-dimethoxycycloartane and 3,4-seco-4(23),14-taraxeradien-3-oic acid.

TL;DR: In this paper, two new aromatic glucosides have been isolated from the stems of Berchemia racemosa together with the known glycosides, nudiposide, (−)-secoisolariciresinol-O-β-d-glucopyranoside and methoxyhydroquinone-1-O -β -d -glucopeyside (isotachioside).

TL;DR: The dual site of action exhibited by these two fungicides predicts a lower risk of resistance development against this group of compounds.

TL;DR: A carbohydrate fraction isolated from yeast extract by ethanolic precipitation was used as an elicitor to induce secondary product formation in plant cell suspension cultures, and the elicitor preparation is effective in inducing glyceollin isomer synthesis and enhancing berberine biosynthesis.

TL;DR: It is suggested that Ca 2+ and cyclic AMP participate as second messengers in the regulation of 6-methoxymellein production in cultured carrot cells and function in an early stage of the elicitation process.

TL;DR: The roles of invertase and sucrose synthase in sucrose accumulation in Cucumis fruit characterized by accumulation of sucrose in the maturing fruit, while cucumber and non-sweet melon had a low sucrose content at all stages studied.

TL;DR: High light intensities at a high temperature had a drastic effect on the fatty acid content, reducing it by as much as 46 % in 19 strains of Spirulina.

TL;DR: Wild populations had a considerably higher total glucosinolate content than cultivars which may limit their usefulness in breeding programmes and support the hypothesis of a multiphyletic origin of cultivated forms of B. oleracea.

TL;DR: The isolation and characterisation of chromones and coumarins, including the new chromone, skimminin, from S. laureola, was reported in this paper, where the authors also reported a novel chromone for the first time.

TL;DR: The hexane extract from the roots of Krameria cystisoides yielded besides conocarpan, licarin A, eupomatenoids 6 and 13, and ratanhiaphenol I 16 hitherto unknown lignans, neolignans and nomeoligns, among them toltecol and olmecol as mentioned in this paper.

TL;DR: In this article, mung beans were treated with different concentrations of lead and mercury, and an estimation of δ-aminolevulinic acid dehydratase activity, chlorophyll and protein contents were performed.

TL;DR: Metabolites produced by Botryodiplodia theobromae possessing plant growth regulating activities were shown to be the 7-epimer of jasmonic acid and its derivatives.

TL;DR: Hairy root cultures obtained following infection of a range of Nicotiana species with Agrobacterium rhizogenes synthesized alkaloids in amounts which closely reflected, in both qualitative and quantitative terms, the biosynthetic capacity of roots from the uninfected parent species or variety.

TL;DR: This tissue represents an ideal material for the study of these enzymatic steps, their regulation and compartmentation, as well as the intracellular localization of the final metabolites.

TL;DR: In this article, the amount and molecular size of soluble polyuronide extractable from ripening tomatoes is markedly affected by residual enzyme activity and the efficacy of phenol-acetic acid-water treatment to remove this residual activity is demonstrated.

TL;DR: From the methanol extract of the Indian liverwort Marchantia polymorpha, two new cyclic bis(bibenzyls), isomarchantin C and isoriccardin C, and a new phenanthrene derivative, 2-hydroxy-3,7-dimethoxyphenanthrene, are isolated.

TL;DR: In this article, the aerial parts of Artemisia assoana have been isolated from root extracts of the same plant 1H and 13C NMR spectra of some of these compounds are given and taxonomic aspects are discussed.

TL;DR: When [2-14C]-tyramine is fed for 2 hr to TMV inoculated leaf discs or detached leaves, ca 1 % of the supplied radioactivity is integrated into cinnamoyl-, p-coumaroyl- and feruloyltyramsine and up to 14 % is Integrated into the cell wall residue.

TL;DR: Experiments using purified enzymes and enzymically inactive wall preparations show that the combined action of polygalacturonase and pectinesterase can mimic this in vitro autolysis of cell walls.

TL;DR: Moscatilin, a new bibenzyl derivative isolated from the orchid Dendrobium moscatum, was shown to have the structure 4,4′-dihydroxy-3,3′,5-trimethoxybibensyl.