Screening of plant extracts for antioxidant activity: a comparative study on three testing methods.
- I. Koleva, T. V. van Beek, J. Linssen, A. de Groot, L. Evstatieva
- Chemistry, MedicinePhytochemical Analysis
Three methods widely employed in the evaluation of antioxidant activity, namely 2,2'-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method, static headspace gas chromatography (HS-GC) and…
Chemical analysis and quality control of Ginkgo biloba leaves, extracts, and phytopharmaceuticals.
Genome‐based discovery, structure prediction and functional analysis of cyclic lipopeptide antibiotics in Pseudomonas species
- I. de Bruijn, M. D. de Kock, Meng Yang, P. de Waard, T. V. van Beek, J. Raaijmakers
- BiologyMolecular Microbiology
- 1 January 2007
The genome‐based identification of previously unknown CLP gene clusters in plant pathogenic Pseudomonas syringae strains B728a and DC3000 and in plant beneficial Pseudomoas fluorescens Pf0‐1 and SBW25 are reported, indicating that genome mining may enable the discovery of unknown gene clusters and traits that are highly relevant in the lifestyle of plant beneficial and plant pathogen bacteria.
Massetolide A Biosynthesis in Pseudomonas fluorescens
- I. de Bruijn, M. D. de Kock, P. de Waard, T. V. van Beek, J. Raaijmakers
- Biology, ChemistryJournal of Bacteriology
- 9 November 2007
Cloning, sequencing, site-directed mutagenesis, and complementation showed that massetolide A biosynthesis in P. fluorescens SS101 is governed by three nonribosomal peptide synthetase (NRPS) genes, designated massA, massB, and massC, spanning approximately 30 kb, suggesting that these two genes function in an operon.
Qualitative and Quantitative Variation Among Volatile Profiles Induced by Tetranychus urticae Feeding on Plants from Various Families
- C. Van Den Boom, T. V. van Beek, M. Posthumus, A. de Groot, M. Dicke
- Environmental ScienceJournal of Chemical Ecology
It is hypothesized that plant species with a low degree of direct defense would produce more novel compounds, and almost all of the investigated plant species produced novel compounds that dominated the volatile blend, such as methyl salicylate, terpenes, oximes, and nitriles.
Chemical analysis of Ginkgo biloba leaves and extracts.
- T. V. van Beek
- ChemistryJournal of Chromatography A
Biochemical, Genetic, and Zoosporicidal Properties of Cyclic Lipopeptide Surfactants Produced by Pseudomonas fluorescens
- J. T. de Souza, M. de Boer, P. de Waard, T. V. van Beek, J. Raaijmakers
- BiologyApplied and Environmental Microbiology
- 1 December 2003
Six fluorescent Pseudomonas isolates with zoosporicidal activities were obtained from the wheat rhizosphere and it was found that the application of cell suspensions of strain SS101 to soil or hyacinth bulbs provided significant protection against root rot caused by Pythium intermedium.
Identification of Olfactory Stimulants for Anopheles gambiae from Human Sweat Samples
The behavioral and electroantennogram responses of female Anopheles gambiae mosquitoes to pooled samples of freshly collected human sweat and human sweat incubated for 42–52 hr were tested and responses were observed in response to indole, 6-methyl-5-hepten-2-one, and geranyl acetone.
Application of ABTS radical cation for selective on-line detection of radical scavengers in HPLC eluates.
The radical cation 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonate), (ABTS*+) was utilized in an on-line HPLC method for the detection of radical scavengers in complex matrixes and can be applied to perform kinetic studies.
A Liquid Chromatography-Mass Spectrometry-Based Metabolome Database for Tomato1
Unbiased metabolic profiling and comparison of peel and flesh tissues from tomato fruits validated the applicability of the MoTo DB, revealing that all flavonoids and α-tomatine were specifically present in the peel, while several other alkaloids and some particular phenylpropanoids were mainly present inThe flesh tissue.