Search results for "ITEX"
showing 10 items of 15 documents
Behavioral responses of Hyalesthes obsoletus to host-plant volatiles cues
2016
The polyphagous planthopper Hyalesthes obsoletus Signoret is considered to be the principal vector of stolbur phytoplasma, which is associated with yellow diseases of grapevine. To explore the possibility of developing novel control strategies, the behavioral responses to six synthetic mixtures and nine single compounds, previously identified from the headspace of Vitex agnus-castus L. (chaste tree) and Urtica dioica L. (nettle), were investigated in Y-tube bioassays. Choice tests revealed differences in the behavioral responses of males and females to the volatiles that they were exposed to. Males were attracted to a mixture containing (E)-β-caryophyllene, 1,8-cineole, (E,E)-α-farnesene, (…
Developing common protocols to measure tundra herbivory across spatial scales
2021
Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts and standardized methodologies. We designed, applied and assessed standardized protocols to measure tundra herbivory at three spatial scales: plot, site (habitat), and study area (landscape). The plot and site-level protocols were tested in the field during summers 2014-2015 at eleven sites, nine of them comprising warming experimental plots included in the International Tundra Experiment (ITEX). The study area protocols were assessed during 2014-2018 at 24 study areas across the Arctic. Our protocols provide comparable a…
Com transformar un lloc web en una comunitat de lectors
2018
Presentació dels resultats del Projecte d'investigació «Els espais virtuals per a la promoció del llibre i la lectura. Formulació d’indicadors per avaluar-ne la qualitat i efectivitat» FFI2015-69977-R (MINECO/FEDER).
Flavonoids from Acacia pennata and their Cyclooxygenase (COX-1 and COX-2) Inhibitory Activities
2007
Two new flavonoids quercetin 4'-O-alpha-L-rhamnopyranosyl-3-O-beta-D-allopyranoside (1) and apigenin 6-C-[2''-O-(E)-feruloyl- beta-D-glucopyranosyl]-8-C-beta-glucopyranoside (2), along with the known isorhamnetin 3-O-alpha-L-rhamnopyranoside (3), kaempferol 3-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranoside (4), and isovitexin (5) were isolated from the leaves of Acacia pennata Willd. (Mimosaceae) and tested for their anti-inflammatory activity. Their structures were determined by 1D and 2D NMR and mass spectrometry. They were tested for an inhibitory effect on COX-1 and COX-2, showing 60-90% inhibition at 10(-4) g/mL and 5-14% inhibition at 10(-4) g/mL, respectively.
Validation of Semantic Analyses of Unstructured Medical Data for Research Purposes
2019
BACKGROUND: In secondary data there are often unstructured free texts. The aim of this study was to validate a text mining system to extract unstructured medical data for research purposes. METHODS: From a radiological department, 1,000 out of 7,102 CT findings were randomly selected. These were manually divided into defined groups by 2 physicians. For automated tagging and reporting, the text analysis software Averbis Extraction Platform (AEP) was used. Special features of the system are a morphological analysis for the decomposition of compound words as well as the recognition of noun phrases, abbreviations and negated statements. Based on the extracted standardized keywords, findings rep…
Mimonoside D: a new triterpenoid saponin from Mimosa diplotricha Sauvalle (Fabaceae)
2021
A new triterpenoid saponin (Mimonoside D: 3-O-��-L-arabinopyranosyl-3��-hydroxyolean-12-en-28-oic acid 28-O-��-D-xylopyranosyl-(1���2)-��-D- glucopyranoside ester (1)) was isolated from the aerial parts of Mimosa diplotricha Sauvalle together with nine known compounds: 7,4���-dihydroxyflavone (2), kaempferol (3), lupeol (4), betulinic acid (5), ��-sitosterol (6), ��-sitosterol-3-O-��-D-glucopyranoside (7), lutein (8), 5,2���-dihydroxy-7,4���,5���-trimethoxyflavone (9) and vitexin (10). Their structures were elucidated on the basis of spectroscopic (1 D and 2 D nuclear magnetic resonance) and high-resolution mass spectrometric data as well as by comparison of their spectral data with those o…
On the Occurrence of Flavonoids in the acrocarpous Mosses
1978
Summary By means of paper chromatography two flavonoids were isolated from the methanolic extract of the moss Mnium undulatum. One substance was identified by chromatographic data, absorption spectra and acid hydrolysis as isovitexin-7-0-glucoside (saponarin). The second substance resists acid hydrolysis and is by chromatography and absorption spectrum identical with apigenin-6,8-di-C-glycoside (viccnin).
Com parlen de lectura els joves en el fòrum virtual QL?
2017
El fòrum virtual Què Llegeixes? és una comunitat lectora de la Institució de les Lletres Catalanes que va nàixer el 2005 per parlar de llibres i, sobretot, ajudar a la recomanació de lectures entre lectors. La investigació presenta els resultats de l'anàlisi de les intervencions que els lectors escriuen per comentar o compartir dos relats que funcionen en circuits de lectura diferents. Per una part, Mecanoscrit del segon origen, la lectura del qual ha estat recomanada a l'escola i, per una altra, la trilogia iniciada amb el relat Delirium, que circula per la compra per impuls. Les intervencions s'allotgen majoritàriament en el Fòrum Boli i en el Fòrum Ploma, és a dir, els espais adreçats al…
Anti-inflammatory activity of flavonoids from Cayaponia tayuya roots.
2008
Taiuiá or tayuya (Cayaponia tayuya, Cucurbitaceae) is a climbing, lignified plant with a large swollen root that has traditionally been used as an anti-inflammatory and anti-rheumatic agent in the folk medicine of Brazil, Peru, and Colombia.We have assayed the pharmacological properties of a flavonoid fraction obtained from the butanol extract of Cayaponia tayuya roots using two models of topical mouse ear oedema, paying special attention to its influence on the induction on pro-inflammatory enzymes and peptidic mediators.The in vivo experiments involved both the acute oedema induced by a single application of TPA and the subchronic inflammation brought on by repeated applications of TPA. T…
Structure de la page WEB
2009
The concept of paratext appears to be useful to try to describe the structure of a complex Web page. This article will firstly tackle the meaning attributed to this concept by Gérard Genette. Secondly, by trying to spot and to name whatever is likely to appear simultaneously on the screen upon the display of a written document extracted from the Web, it will Webwise redefine the two components of the paratext, namely the epitext and the peritext. Their functions, their feasible meanings and their effects will then be analysed.