Showing papers in "Phytochemistry in 2002"

TL;DR: This work has focused on more recent reports on the occurrence of laccase and its functions in physiological development and industrial utility and the reports of molecular weights, pH optima, and substrate specificity are extremely diverse.

TL;DR: The nature of these polyphenols which have been reported is compiled in this report together with some bioactivity data in an effort to show the rapid development in the phytochemistry and the therapeutic applications of the Salvia species.

TL;DR: This review undertook the systematic analysis of trends manifested through genetic and mutational manipulations of the various steps associated with monolignol biosynthesis; this included consideration of the downstream effects on organized lignin assembly in the various cell types, on vascular function/integrity, and on plant growth and development.

TL;DR: Genistein is a phytoestrogen with a wide variety of pharmacological effects in animal cells, including tyrosine kinase inhibition, and dietary genistein ingestion has been linked with a range of potential health beneficial effects.

TL;DR: The emphasis of the current review is on the chemistry and biological activity of usnic acid and its derivatives in addition to rational and ecologically acceptable methods for provision of this natural compound on a large scale.

TL;DR: It is hypothesized that among algae of alpine environment there could be strains particularly rich in long chain polyunsaturated fatty acids (LC-PUFA), and the chlorophyte Parietochloris incisa isolated from Mt. Tateyama was found to be the richest plant source of the pharmaceutically valuable LC- PUFA, arachidonic acid (AA, 20:4omega6).

TL;DR: Isopestacin is an isobenzofuranone obtained from the endophytic fungus Pestalotiopsis microspora that possesses antifungal activity and also behaves as an antioxidant scavenging both superoxide and hydroxy free radicals.

TL;DR: It was suggested that P. vulgaris could be used in rhizofiltration--the use of plant roots to absorb pollutants from water contaminated with lead, because of the highest rate of Pb ions uptake from the medium and after 96 h of incubation lead content in the medium decreased by half.

TL;DR: All of the triterpenes isolated from the callus tissues showed an inhibitory effect comparable to (-)-epigallocatechin gallate of green tea on the activation of Epstein-Barr virus early antigen (EBV-EA) induced by 12-O-tetradecanoylphorbol-13-acetate (TPA).

TL;DR: The aim of this review is to discuss the regulation of transcription factors involved in secondary metabolism in plants at gene and protein levels, using phenylpropanoid and terpenoid indole alkaloid pathways as two well-studied examples.

TL;DR: Gas chromatographic profiling of fatty acids was performed during the growth cycle of four marine microalgae to establish which, if any, of these could act as a reliable source of genes for the metabolic engineering of long chain polyunsaturated fatty acid (LC-PUFA) synthesis in alternative production systems.

TL;DR: A likely correlation between the effect of UVB on plant growth rate, the level of activity of the F3'H gene, and the proposed photoprotection afforded by an increased Q:K ratio is established.

TL;DR: These polysaccharides enhanced the proliferation of T- and B-lymphocytes in vitro to varying contents and PL-1 exhibited an immune-stimulating activity in mice.

TL;DR: This work reinvestigated Columbia as well as additional ecotypes and mutant lines, and identified 12 further glucosinolates, including five novel compounds, which were the first non-chain elongated, methionine-derived glucos inolate from A. thaliana and the first compounds that appear to be derived from leucine.

TL;DR: Labeling studies showed that de novo synthesis was not required for monoterpene or sesquiterpene release immediately following chemical treatment or insect feeding, and comparative measurements were made between aldehyde doses applied to the plant and levels naturally released from leaves with insect damage.

TL;DR: Triterpene saponins isolated from Medicago sativa and Medicago truncatula roots were separated, profiled and identified using an optimized, reversed-phase HPLC with on-line photodiode array detection and electrospray ionization mass spectrometry method (HPLC/PDA/ESI/MS).

TL;DR: The discovery of genes for trehalose biosynthesis in Arabidopsis and in a range of crop plants suggests that the ability to synthesisetrehalose is widely distributed in the plant kingdom.

TL;DR: Reports on isolation, chemical structure determination, total synthesis, transformation by diverse organisms, and biological activity of destruxins and related metabolites are reviewed for the first time.

TL;DR: The sweet diterpenoid glycoside, rebaudioside F, was isolated from leaves of a high rebaudioide C producing line of Stevia rebaudiana, and its structure was established by chemical and spectral studies.

TL;DR: Isolated polyphenols showed inhibitory effects on nicotinamide adenine dinucleotide phosphate-dependent lipid peroxidation in microsomes and on the autoxidation of linoleic acid, attributed to the radical-scavenging activity in thePeroxidation chain reactions.

TL;DR: Torvanol A (1), torvoside H (3) and compound 5 exhibited antiviral activity (herpes simplex virus type 1) with IC(50) values of 9.6, 23.2 and 17.4 microg/ml, respectively.

TL;DR: The distribution and biosynthesis of iridoid glucosides in the Oleaceae is reviewed and five distinct biosynthetic pathways to iridoids have been identified in the family, deoxyloganic acid apparently being a common intermediate.

TL;DR: The triketone natural products acted as competitive tight-binding inhibitors, whereas the benzoquinones and naphthoquinones did not appear to bind tightly to HPPD.

TL;DR: The bulk delta 15 N-value of plant (leaf) biomass is determined by that of the inorganic primary nitrogen sources NO(3)(-), NH(4)(+) and N(2), and by isotope discriminations on their uptake or assimilation by the GOGAT-reaction.

TL;DR: Two triterpenoids, 20beta-acetoxy-2alpha,3beta-dihydroxy-24-p-z-coumaroyloxyurs-12-en-28-oic acid and 2alpha-hydroxyursolic acid, have been isolated from the leaves of Psidium guajava and their structures were determined through spectroscopic methods.

TL;DR: The essential oil and some of its minor constituents were effective and dose-dependent inhibitors of both the germination and radicle growth of Ruta graveolens and 2-ketones are not active.

TL;DR: The cyclohexenyl chalcone derivative and (-)-panduratin A showed significant topical anti-inflammatory activity in the assay of TPA-induced ear edema in rats.

TL;DR: The study revealed the ability of brassinosteroids in accelerating fruit-senescence and fruit ripening as induced by Brassinosteroid was associated with increase in ethylene production.

TL;DR: Differences in higher order effects in glucosides and allosides proved to be valuable for assignment of structures in this series and the assignment of C-2 stereochemistry of 1a/b was made in analogy to previous assignments in the glucoside series.

TL;DR: A dramatic increase in cell growth and hypericin production was observed after exposure to jasmonic acid (JA), however, other elicitors such as salicylic acid (SA) and fungal cell wall elicitors failed to show any stimulatory effect on either cell growth or hyperic in production.