Search results for "ATTRACTION"
showing 10 items of 152 documents
Glutamate and opioid antagonists modulate dopamine levels evoked by innately attractive male chemosignals in the nucleus accumbens of female rats
2017
Sexual chemosignals detected by vomeronasal and olfactory systems mediate intersexual attraction in rodents, and act as a natural reinforcer to them. The mesolimbic pathway processes natural rewards, and the nucleus accumbens receives olfactory information via glutamatergic projections from the amygdala. Thus, the aim of this study was to investigate the involvement of the mesolimbic pathway in the attraction toward sexual chemosignals. Our data show that female rats with no previous experience with males or their chemosignals display an innate preference for male-soiled bedding. Focal administration of the opioid antagonist b-funaltrexamine into the posterior ventral tegmental area does no…
Attraction to male pheromones and sexual behaviour show different regulatory mechanisms in female mice.
2004
In rodents, female sexual behaviour is under hormonal control. The attraction females show for male-derived nonvolatile chemicals (pheromones) can be regarded as the first step of this behaviour, but it is unknown whether this attraction is also modulated by sexual steroids. To test this possibility, ovariectomized adult female mice with no experience of chemical signals from adult males were randomly assigned to four groups that received oil (control), progesterone, estradiol (E) or estradiol+progesterone (E+P) injections, respectively. Females were then tested for their attraction to male-soiled bedding and, subsequently, for their proceptive behaviour when confronted to adult males. Fema…
Large deviations results for subexponential tails, with applications to insurance risk
1996
AbstractConsider a random walk or Lévy process {St} and let τ(u) = inf {t⩾0 : St > u}, P(u)(·) = P(· | τ(u) < ∞). Assuming that the upwards jumps are heavy-tailed, say subexponential (e.g. Pareto, Weibull or lognormal), the asymptotic form of the P(u)-distribution of the process {St} up to time τ(u) is described as u → ∞. Essentially, the results confirm the folklore that level crossing occurs as result of one big jump. Particular sharp conclusions are obtained for downwards skip-free processes like the classical compound Poisson insurance risk process where the formulation is in terms of total variation convergence. The ideas of the proof involve excursions and path decompositions for Mark…
Chemical and behavioural characterization of the rabbit mammary pheromone.
2003
Mammals owe part of their evolutionary success to the harmonious exchanges of information, energy and immunity between females and their offspring. This functional reciprocity is vital for the survival and normal development of infants, and for the inclusive fitness of parents. It is best seen in the intense exchanges taking place around the mother's offering of, and the infant's quest for, milk. All mammalian females have evolved behavioural and sensory methods of stimulating and guiding their inexperienced newborns to their mammae, whereas newborns have coevolved means to respond to them efficiently. Among these cues, maternal odours have repeatedly been shown to be involved, but the chem…
Pheromones and Chemical Ecology of Dispersal and Foraging in Termites
2010
Pheromones play a crucial role in the ecology of dispersal and foraging in termites. Sex-pairing pheromones possess a double role of long-range attraction to unite sexual partners and a short-range or contact attraction to maintain the pair during the tandem behaviour. Sex-pairing pheromones most often comprise a single compound capable of eliciting both behavioural effects. They appear very conservative in their evolution, and their role in the reproductive isolation of sympatric species greatly varies according to species. Species-specific sex-pairing pheromones consist of different major compounds or of a common major compound with species-specific minor components. Foraging is a collect…
Totally new and pretty awesome : Amplifier–adjective bigrams in GloWbE
2017
Abstract Previous work on adjectival intensification (e.g. very good , so glad , really great ) has mostly focussed on the adverbs in question, showing that different (native) varieties of English display distinctive preferences concerning intensifier choice. However, little is known so far about the role that intensifier-adjective units (bigrams) play. The present paper offers a first contribution to fill this research gap by focussing on a data-driven approach to (mostly) high-frequency bigrams and their collocational behaviour in the Corpus of Global Web-based English (GloWbE). Asymmetric and symmetric measures are employed to establish attraction and repulsion between adverb and adjecti…
Diversity in Romantic Relations of Adolescents with Varying Health Status
2000
In a longitudinal study on adolescents varying in health status, the similarities and differences between adolescents’ close friendships and romantic relationships were analyzed. From a total of 91 diabetic and 107 healthy adolescents, a subsample of 95 adolescents who consistently had experiences with both relationships over 4 years was drawn. Information was obtained from semistructured interviews and the Network of Relationship Inventory. The results demonstrated important time-dependent links between intimacy in both relationship types in healthy adolescents. Despite considerable gains in intimacy toward close friends and romantic partners across time, diabetic adolescents did not focu…
Nectar-Inhabiting Bacteria Affect Olfactory Responses of an Insect Parasitoid by Altering Nectar Odors
2022
AbstractFloral nectar is ubiquitously colonized by a variety of microorganisms among which yeasts and bacteria are the most common. Microorganisms inhabiting floral nectar can alter several nectar traits, including nectar odor by producing microbial volatile organic compounds (mVOCs). Evidence showing that mVOCs can affect the foraging behavior of insect pollinators is increasing in the literature, whereas the role of mVOCs in altering the foraging behavior of third-trophic level organisms such as insect parasitoids is largely overlooked. Parasitoids are frequent visitors of flowers and are well known to feed on nectar. In this study, we isolated bacteria inhabiting floral nectar of buckwhe…
O przemianach obrzędowości Świąt Wielkanocnych w Polsce (na przykładzie święcenia potraw)
2019
Przedmiotem refleksji są wybrane aspekty dotyczące przeobrażeń obrzędowości Świąt Wielkanocnych w Polsce. W artykule skupiono uwagę przede wszystkim na tradycji święcenia pokarmów w Wielką Sobotę, omówiono dawne i współczesne praktyki zwyczajowe z nią związane. Podstawą opracowań jest dostępna literatura etnograficzna, pilotażowe badania terenowe prowadzone przez autorkę w różnych częściach Polski, w tym głównie w województwach śląskim, opolskim i łódzkim oraz materiały internetowe.
The Ghost of the Hawk: Top Predator Shaping Bird Communities in Space and Time
2021
Despite the wide recognition that strongly interacting species can influence distributions of other species, species interactions are often disregarded when assessing or projecting biodiversity distributions. In particular, it remains largely uncharted the extent to which the disappearance of a keystone species cast repercussions in the species composition of future communities. We tested whether an avian top predator can exert both positive and negative effects on spatial distribution of other species, and if these effects persist even after the predator disappeared. We acquired bird count data at different distances from occupied and non-occupied nests of Northern goshawks Accipiter genti…