Publications by authors named "Sirlei D Teixeira"
Article Synopsis
- - Eragrostis plana (Tough Lovegrass) exhibits allelopathy, meaning it can release chemicals that inhibit the growth of other plants, which was explored through a phytotoxicity study using root samples collected throughout the year.
- - The study used various solvents to extract compounds from the roots, and the effects on the germination and growth of Ipomoea grandifolia were assessed, revealing that extracts in petroleum ether from winter and summer roots had the strongest negative effects.
- - Analysis techniques like Generalized Linear Modeling (GLM), Principal Component Analysis (PCA), and High-Performance Liquid Chromatography with Diode Array Detection (HPLC-DAD) indicated significant chemical differences in the extracts, highlighting the potential
Article Synopsis
- - Five new neocassane-like diterpenes were discovered in the roots of a plant, and their structures were identified through various spectroscopic methods.
- - The absolute configurations of two specific compounds, neocassa-12(17),15-dien-3-one and neocassa-12(13),15-diene-3,14-dione, were determined using vibrational circular dichroism.
- - One of the compounds showed strong phytotoxic effects, significantly inhibiting the growth and germination of certain plants, even outperforming the common herbicide glyphosate in reducing germination speed.
Article Synopsis
- Ipomoea species are problematic weeds in Brazilian agriculture, and drought conditions decrease the effectiveness of glyphosate herbicides by affecting how well plants absorb and distribute them.
- This study investigated the relationship between epicuticular wax amounts and glyphosate tolerance in different plant biotypes, finding that glyphosate-tolerant plants produced more wax under drought stress compared to sensitive ones.
- The research also revealed varying chemical compositions of waxes in three Ipomoea species, with some showing increased polar components under normal conditions, while others showed no significant differences due to water availability.
D-Glucans possess immunomodulatory activities and potential for the development of new therapeutic agents. Biological activities can be enhanced in these biopolymers through chemical derivatization, e.g.
View Article and Find Full Text PDFThe essential oils of Guatteriopsis blepharophylla, Guatteriopsis friesiana and Guatteriopsis hispida were obtained by hydrodistillation and analysed by GC and GC/MS. The main compound found in the leaf oil of G. blepharophylla was caryophyllene oxide (1) (69.
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- * A total of 26 bats were captured, with 80.7% caught in nets containing the essential oil, demonstrating a clear preference for the scented fruit.
- * Our findings suggest that smell is more important than sight for C. perspicillata when locating food, and we recommend using essential oils from fruit to attract bats for ecological studies and forest restoration efforts.