Search results for "Chemical stimuli"

Chemosensory enrichment as a simple and effective way to improve the welfare of captive lizards

2018

Nanohydrogel Formation within the Halloysite Lumen for Triggered and Sustained Release

2018

An easy strategy to obtain nanohydrogels within the halloysite nanotube (HNTs) lumen was investigated. Inorganic reverse micelles based on HNTs and hexadecyltrimethylammonium bromides were dispersed in chloroform, and the hydrophilic cavity was used as a nanoreactor to confine the gel formation based on alginate cross-linked by calcium ions. Spectroscopy and electron microscopy experiments proved the confinement of the polymer into the HNT lumen and the formation of calcium-mediated networks. Biological tests proved the biocompatibility of the hybrid hydrogel. The nanogel in HNTs was suitable for drug loading and sustained release with the opportunity of triggered burst release by chemical …

Drosophila adult and larval pheromones modulate larval food choice

2014

Insects use chemosensory cues to feed and mate. In Drosophila , the effect of pheromones has been extensively investigated in adults, but rarely in larvae. The colonization of natural food sources by Drosophila buzzatii and Drosophila simulans species may depend on species-specific chemical cues left in the food by larvae and adults. We identified such chemicals in both species and measured their influence on larval food preference and puparation behaviour. We also tested compounds that varied between these species: (i) two larval volatile compounds: hydroxy-3-butanone-2 and phenol (predominant in D. simulans and D. buzzatii , respectively), and (ii) adult cuticular hydrocarbons (CHs). Dro…

Projections from the posterolateral olfactory amygdala to the ventral striatum: neural basis for reinforcing properties of chemical stimuli

2007

Abstract Background Vertebrates sense chemical stimuli through the olfactory receptor neurons whose axons project to the main olfactory bulb. The main projections of the olfactory bulb are directed to the olfactory cortex and olfactory amygdala (the anterior and posterolateral cortical amygdalae). The posterolateral cortical amygdaloid nucleus mainly projects to other amygdaloid nuclei; other seemingly minor outputs are directed to the ventral striatum, in particular to the olfactory tubercle and the islands of Calleja. Results Although the olfactory projections have been previously described in the literature, injection of dextran-amines into the rat main olfactory bulb was performed with …

Chemical stimuli induce courtship dominance in Drosophila

2005

Courtship dominance in male Drosophila occurs when a male directs high levels of courtship towards another male, who remains passive [1]. We investigated the cues that shape this effect and report here that it is induced by the perception of adult male cuticular hydrocarbons during a critical period.

A highly selective, Hg2+ triggered hydrogelation: modulation of morphology by chemical stimuli

2013

We report the first Hg(2+) selective hydrogelation by 4'-[4-(4-aminophenyl)phenyl]-2,2':6',2''-terpyridine. The gel showed remarkable response towards specific chemical agents such as benzo-18-crown-6 ether and K(+) which enabled extensive modulation of the gel morphology.

Multimodal interactions

2016

Revue; International audience; Introduction A central sensory characteristic of food is its flavor, which, most of the time, confers to a given food product its identity and typicality, and thus contribute to its liking (Prescott, 2015). Flavor has been defined as a sensory percept induced by food or beverage tasting. This holistic perception is constructed through the functional integration of information transmitted by the chemical senses: olfaction, gustation, and oral and nasal somatosensory inputs (Thomas-Danguin, 2009). Flavor may be influenced by other nonchemical sensory inputs such as texture, sound, or color (Spence, 2013). The functional integration of information transmitted by …