The effect of feeding on defecation behaviour in pigs.

“The effect of eating on defecation behaviour was investigated in four 20-30 kg pigs. Rectal distention stimulation was performed pre- and postprandially at 10 cm from the anus with a 5 cm latex balloon. Volume was increased in steps of 10 ml up to 200 ml of air or until balloon defecation. (more…)

Intestinal hydrogen and methane of men fed space diet.

“Intestinal bacteria form two gases, hydrogen (H2) and methane (CH4), that could constitute a fire hazard in a closed chamber. So H2 and CH4 pass from the anus but these gases are also transported by the blood to the lungs and removed to the atmosphere. Several factors affect gas formation: 1) amount and kind of fermentable substrate; 2) abundance, types, and location of microflora; and 3) psychic and somatic conditions that affect the gut. (more…)

 When Pooping Babies Become More Appealing: The Effects of Nonconscious Goal Pursuit on Experienced Emotions.

“In this report, we argue that the intensity of the emotions people experience is partly determined by the goals they nonconsciously pursue, and that this effect is functional in nature: Emotions are modulated in ways that may increase the probability of goal achievement. To test this hypothesis, we primed female participants with a motherhood goal and then measured their level of disgust in response to mildly disgusting pictures. (more…)

Children’s experiences of school toilets present a risk to their physical and psychological health.

“OBJECTIVE: To ascertain why children and parents frequently describe problems with school toilets. SETTING: Two contrasting cities in Northern England (Newcastle upon Tyne 394 pupils) and Southern Sweden (Goteborg/Mölndal 157 pupils). (more…)

“Each year, millions of people travel aboard airplanes and cruise ships. A significant portion of the newer larger airplanes (the Boeing 767 and the Aerobus) and cruise ships now have vacuum toilet systems. There have been no reports in the medical literature on the frequency of injuries associated with the use of these toilets, but serious injury, including soft tissue trauma and organ evisceration, may be associated with the use of such devices.) The investigators report a case of significant perineal injury accompanied by hypotension associated with the use of a vacuum toilet on an airplane. (more…)

The Fecal Odor of Sick Hedgehogs (Erinaceus europaeus) Mediates Olfactory Attraction of the Tick Ixodes hexagonus.

“Parasite loads of animals vary among individuals, but the underlying mechanisms have not been fully identified. Here, we investigated whether health status of hedgehogs (Erinaceus europaeus) is correlated with tick burden, and whether chemical cues linked to the health status of the host mediate attraction of the tick Ixodes hexagonus. An ecological survey conducted over 10 years, involving 226 wild hedgehogs, revealed a strong association between health status and tick burden of hedgehogs, with healthy animals being less likely to carry ticks than unhealthy ones. Behavioral choice tests demonstrated that ticks display a preference for the fecal odor from sick hedgehogs compared with healthy ones. Chemical analysis of fecal odors using gas chromatography – mass spectrometry showed differences in the odor profile between sick and healthy hedgehogs. (more…)

Influence of body position and stool characteristics on defecation in humans.

“Whether defecation is influenced by body position or stool characteristics is unclear. We investigated effects of body position, presence of stool-like sensation, and stool form on defecation patterns and manometric profiles. Rectal and anal pressures were assessed in 25 healthy volunteers during attempted defecation either in the lying or sitting positions and with balloon-filled or empty rectum. (more…)

“OBJECTIVE: Traditionally, barium paste has been used for performing defecography. Because this substance is not stool-like, barium defecography may not accurately represent defecatory function. Our aim was to prospectively compare the utility of a new artificial stool, “FECOM”–a silicon-filled and barium-coated, deformable device the shape and consistency of which mimicked a normal formed stool with that of barium paste. METHODS: Defecography was performed after placing FECOM or barium paste in a random order in 12 healthy subjects (two men and 10 women). We evaluated the changes in anorectal angle, rectal morphology, rectal sensation, and the subjects’ preference for a “stool-like” device. (more…)

Innate olfactory preferences in dung beetles.

“The effects of insect larval diet on adult olfactory responses to host-plant or food volatiles are still debated. The induction of adult host preferences has been studied in insects with diverse ecologies, including parasitoids, flower-visitors and phytophagous species. We investigated this question for the first time in a coprophagous insect species. Larvae of the French scarab dung beetle Agrilinus constans were reared on four different artificial substrates containing dung from cattle, horse, sheep or wild boar, and responses of imagos to dung volatiles were then behaviourally tested in an olfactometer. (more…)

Chemical processes in the deep interior of Uranus.

“The unusual magnetic fields of the planets Uranus and Neptune represent important observables for constraining and developing deep interior models. Models suggests that the unusual non-dipolar and non-axial magnetic fields of these planets originate from a thin convective and conducting shell of material around a stably stratified fluid core. Here, we present an experimental and computational study of the physical properties of a fluid representative of the interior of Uranus and Neptune. (more…)