Search results for "LF"
showing 10 items of 12543 documents
Degradation of an alkaloid pheromone from the pale-brown chafer, Phyllopertha diversa (Coleoptera: Scarabaeidae), by an insect olfactory cytochrome P…
1999
AbstractThe pale-brown chafer, Phyllopertha diversa, utilizes an unusual alkaloid, 1,3-dimethyl-2,4-(1H,3H)-quinazolinedione, as its sex pheromone. This compound is rapidly degraded in vitro by the antennal protein extracts from this scarab beetle. Demethylation at the N-1 position and hydroxylation of the aromatic ring have been identified as the major catabolic pathways. The enzyme responsible for the pheromone degradation is membrane-bound, requires NAD(P)H for activity and is sensitive to cytochrome P450 inhibitors, such as proadifen and metyrapone. The ability to metabolize this unusual pheromone was not detected in 12 species tested, indicating that the P450 system, specific to male P…
Guano-related phosphate-rich minerals in European caves
2019
International audience; Guano is a typical deposit found in caves derived from the excretions of bats and in minor cases of birds. These organic deposits decompose and form a series of acid fluids and gases that can interact with the minerals, sediments, and rocks present in the cave. Over sixty phosphates are known and described from caves, but guano decay also often leads to the formation of nitrates and sulfates. In this study twenty-two European caves were investigated for their guano-related secondary minerals. Using various analytical techniques, seventeen phosphates, along with one sulfate (gypsum), were recognized as secondary products of guano decay. Among those minerals, some are …
Post-fotografia etnografica
2020
Sommario: È evidente come la nostra società tecnologica sia legata senza alcun dubbio alla diffusione delle immagini. Autori come Gottfried Boehm, John Mitchell, Hans Belting hanno indagato la natura dell'immagine ponendo le basi, negli anni Novanta, per l'idea di un pictorial turn, di una cultura totalmente dominata dalle immagini che è diventata adesso una possibilità tecnica reale su scala globale. Un nuovo statuto dell'immagine che si usa raccogliere sotto l'etichetta di iconic turner inserito nel più vasto campo visual culture studies. Summary: It is evident that our technological society is undoubtedly linked to the diffusion of images. Authors such as Gottfried Boehm, John Mitchell, …
Surfactant-Mediated Morphology and Photocatalytic Activity of α‑Ag2WO4 Material
2018
In the present work, the morphology (hexagonal rod-like vs cuboid-like) of an α-Ag2WO4 solid-state material is manipulated by a simple controlled-precipitation method, with and without the presence of the anionic surfactant sodium dodecyl sulfate (SDS), respectively, over short reaction times. Characterization techniques, such as X-ray diffraction analysis, Rietveld refinement analysis, Fourier-transform (FT) infrared spectroscopy, FT Raman spectroscopy, UV–vis spectroscopy, transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction, energy-dispersive X-ray spectroscopy, field emission-scanning electron microscopy (FE-SEM), and photoluminescence emission…
Students' self-determined motivation in physical education and intention to be physically active after graduation : the role of perceived competence …
2014
Purpose: This study examined whether high school students' degree of self-determined motivation in school physical education predicted their intentions to be physically active after graduation, and whether perceived physical competence and physical activity identity mediated this hypothesized cross-sectional relationship. Additionally, the possibility of conditional effects of gender on these associations was considered. Method: A cross sectional study involving 1650 high-school students allowed for the examination of indirect effects using a bias-corrected bootstrapping technique. Results: Results showed that self-determination in PE may positively affect adolescents' intentions to be phys…
The Basic Psychological Needs in Physical Education Scale in Filipino: An Exploratory Factor Analysis
2014
Fulfillment of students’ basic psychological needs in school physical education is essential for their optimal motivation and well-being. The present study aimed to: (1) translate the Basic Psychological Needs in Physical Education Scale (BPNPE Scale; Vlachopoulos, Katarzi, & Kontou, 2011) to Filipino, and (2) examine the reliability and validity of the Filipino version. Instrument translation was conducted using a committee-approach back-translation procedure. The Filipino version was then administered to 408 public high school students from Metro Manila during one of their PE classes. Results showed that internal consistency reliabilities of the subscales were adequate with alphas ranging…
Conséquences d'un régime diabétogène enrichi en fructose sur la muqueuse olfactive : aspects anatomiques, fonctionnels et comportementaux
2015
The influence of metabolic status on olfactory processes has been thoroughly investigated over the last few years. Both nutritional status and hormones implicated in food metabolism can effectively modulate the olfactory system from the single neuron to the behavior. Thus, it seems likely that metabolic disorders such as type 2 diabetes (T2D) can induce olfactory dysfunctions. In fact T2D patients display poor olfactory performances however the effects of diabetes in itself (as well as underlying mechanisms) are still unknown. In this study, we investigated the modulation of olfaction in young adult male mice caused by a high-fructose diet (HFruD) inducing T2D in rodents. Animals displayed …
Self-cleaning ZnO/ITO/PET Bending Sensors
2022
The design of multifunctional materials is of pivotal importance for developing wearable biosensors. In particular, the advancement in self-cleaning materials suitable for bending sensors, i.e. devices able to track human body movements for healthcare monitoring [1], has raised much interest in recent pandemic times. Such technology can be facilitated by leveraging piezo-photocatalytic cleaning effects under visible light [2]. Herein, we show a new class of ZnO-based nanosheets (NSs) synthesized in aqueous solution (85 °C, 24 hours) onto seeded or seedless ITO/PET surfaces that couple sensing to photocatalysis. UV-vis and FT-IR spectroscopies show the typical absorption peaks of ZnO. A nano…
Le bébé gastronome
2018
L’alimentation des très jeunes enfants suscite de nombreuses interrogations : pourquoi Lou dévore-t-elle son plat d’épinards alors que Diego refusera catégoriquement d’y goûter ? Comment se fait-il qu’hier encore, Lou raffolait du gratin de courgettes alors qu’elle fait aujourd’hui la grimace dès qu’elle sent son odeur ? Et que faire avec Diego, qui dit « non » à tous les nouveaux plats qu’on lui propose ?Faut-il forcer un enfant à finir son assiette ? Comment peut-on proposer l’alimentation variée et équilibrée recommandée par les nutritionnistes quand un enfant refuse de goûter ?Il faut l’avouer, nourrir nos chers petits peut parfois s’avérer être un vrai casse-tête !
Idea samorządności w Polsce - próba aksjologicznej systematyzacji w ujęciu politologicznym
2014
Na przestrzeni dwóch dekad funkcjonowania samorządności w Polsce nastąpiły przeobrażenia w katalogu podstawowych wartoœci samorządu terytorialnego. W pierwszych dziesięciu latach, gdy budowano fundamenty samorządności w Polsce, najważniejsze były podstawowe, ustrojowe wartości, tj. wolność, równość czy powszechność. W drugim natomiast ustąpiły one miejsca wartościom fundamentalnym dla rozwoju samorządu terytorialnego takim, jak: więzi lokalne, poczucie wspólnoty, kapitał społeczny, inkluzja polityczna, czy wreszcie społeczeństwo obywatelskie. Równolegle następowały zmiany w wymaganiach stawianych pracownikom samorządowym. Pojawiły się i ulegały uściśleniu, akty prawne rangi ustawowej określ…