Alex Bender - «Quantification of Vasotocin Release in Response to
Sex Pheromones in Roughskin Newts» (Advisors: P. Dickinson and R. Thompson)
Megan Massa: Rapid Effects of Testosterone on Responsiveness to
Sex Pheromones in Male Carassius auratus
Female insects emit
sex pheromones in order to attract potential mating partners.
Using microelectrodes, the researchers recorded the electrical activity of pheromone - sensitive interneurons in male American cockroaches that relay signals of female - producing
sex pheromones in the antennal lobe (functional homolog to the mammalian olfactory bulb) to higher - order centers.
«I was certain that it would be a small molecule, like
sex pheromones in sea anemones or something along those lines.
Not exact matches
They discovered that
pheromones secreted by the male mouse activate these neurons which,
in turn, transmit this signal to another population of neurons (gonadotropin - releasing hormone neurons) to drive attraction to the opposite
sex.
They did this by disabling an enzyme
in «a» cells that usually destroys the «same -
sex»
pheromone.
«Right about five o'clock
in the afternoon — we call it the rush hour — the beetles climb to the top of the trees and release a
sex pheromone that travels on the wind.
With its odor - sensitive antennae, the moth senses a target smell —
in this case, female silkworm
sex pheromones — and walks toward it along the trackball, driving the robotic car.
In the lab, and in field experiments, female brown rats readily enter trap boxes baited with the male brown rat's sex pheromon
In the lab, and
in field experiments, female brown rats readily enter trap boxes baited with the male brown rat's sex pheromon
in field experiments, female brown rats readily enter trap boxes baited with the male brown rat's
sex pheromone.
A similar discovery
in fruit flies, reported
in an earlier independent study, which shows that a particular
sex pheromone enhances female sexual behaviors and male aggression via separate neural circuits between the
sexes, suggests that a sexually distinct circuit may be a universal strategy for converting male
pheromone information into appropriate behavioral output.
Ever since a
pheromone secreted by a female moth that attracts the opposite
sex was identified
in 1959, scientists have pinned down numerous chemicals that affect behavior
in a wide variety of animal species, from insects to mammals to humans.
Many previous studies have examined the role that
sex - specific
pheromones or semiochemicals play
in the evolution of a spider's reproduction cycle.
According to lead author of the study, Dr Marinus De Jager of Stellenbosch University: «Since the discovery that the floral scent of these remarkable orchids mimics female
sex pheromones, many of these compounds have been made
in the laboratory.
In essence, the question is which came first, a new species or its
sex pheromone?
RS also turns up
in the male
sex pheromones of another species of wasp, N. giraulti, whereas RR appears to be unique.
Maures et al. (p. 541, published online 29 November) explored why the presence of abundant mating - competent males causes a decrease
in the life span of nematodes of the opposite
sex and found that a secreted substance, possibly a
pheromone, reproduced the effect of the males when transferred
in the culture medium.
In moths, females emit a species - specific
sex pheromone, consisting of a blend of biochemically related components, to which males are attracted.
In Adelaide, Professor Mike Tyler is exploring the possibility of using pheromones (e.g., sex - attractant chemicals) to help in toad - trappin
In Adelaide, Professor Mike Tyler is exploring the possibility of using
pheromones (e.g.,
sex - attractant chemicals) to help
in toad - trappin
in toad - trapping.
In contrast, the Drosophila sex pheromone cVA is detected by both sexes and elicits dimorphic behavior by routing the signal via different third order neuronal circuits deep in the brains of males and females [19
In contrast, the Drosophila
sex pheromone cVA is detected by both
sexes and elicits dimorphic behavior by routing the signal via different third order neuronal circuits deep
in the brains of males and females [19
in the brains of males and females [19].
But rather than changes
in doublesex itself, these studies revealed changes
in downstream targets of dsx, via changes to specific DNA sequences to which DSX protein binds
in the cis - regulatory regions of the bric - a-brac and desatF genes and affecting
sex differences
in abdominal pigmentation and
pheromone production.
Mice of both
sexes appear capable of detecting this
pheromone, suggesting the differential response is due to modifications
in the downstream neural circuitry [4].
In silk moths, this is achieved by only males expressing the receptor BmOR - 1 in their antenna, which detects the female - specific sex pheromone bombykol [18
In silk moths, this is achieved by only males expressing the receptor BmOR - 1
in their antenna, which detects the female - specific sex pheromone bombykol [18
in their antenna, which detects the female - specific
sex pheromone bombykol [18].
Thus diversity
in receptor expression can explain differences
in odor sensitivity, but does not appear to dictate whether
sex pheromones are differentially detected by males or females.
Before then, they assumed that B. germanica didn't need a volatile
sex pheromone because the cockroaches live
in close quarters where males could easily find females, Schal says.
However the contraceptive pill tampers with this cycle, so your smell receptors aren't as responsive to the male (or female)
pheromone, and may reduce your interest
in sex.
When a dog sniffs the faeces and the anal regions of another dog it is finding out important information via the
pheromones in the scent, including the other dog's
sex and sexual status.
His specialty is explaining scientific studies for lay audiences, including recent stories about riverless urban areas
in the Great Lakes Basin, the impact of climate change on rare plants and the use of
sex pheromones to combat the invasive sea lamprey.