Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Smell of death

23.10.2007
Odorant chemical agents, pheromones, serve for animals’ contact purposes. Animals mark the territory by odorous discharges, demonstrate their hierarchic roles or sex attribute to their congeners, regulate propagation in the group, provide for the mother/baby interrelation.

Pheromones perform a lot of functions, and the researchers are striving to perceive them all, but they carry out the investigations mainly on healthy animals. Chemical signals of sick animals have been much less studied although they are no less interesting.

B.P. Surinov worked with the mice, part of which had received a fatal dose of gamma irradiation, and part – a toxic dose of lead nitrate, and one more group of animals was inoculated with cancerous growth. The animalsurine was collected on a sheet of filter paper, which was placed under the netted bottom of the cage for twenty-four hours. Then it was the turn of healthy tester- mice. They were placed one at a time into a cage, where paper with urine samples of experimental and healthy animals was lying in secluded nooks. The tester-mouse would follow the smell and the experimentalist observed which paper it would choose.

It has turned out that at the early stage of irradiation, poisoning or tumour development, pheromones of sick mice attract their congeners. The same action is produced by the urine smell of the rodents that are not threatened with death, for example, of the ones that had experienced stress or received a non-fatal radiation dose. When the pathology has developed and the mouse’s fate has been determined, its urine acquires repulsive properties, which are particularly noticeable on the eve of the death. The smell action does not depend on the pathology nature, but it only depends on its severity. The meaning of repulsive signals is clear: they limit contacts of seriously ill animals and prevent possible spread of infection (apparently, the pheromone notifies only about severity of the sick animal’s state, but does not inform about the exact diagnosis). The researchers are still to sort out the reason why the pheromones attracting to a sick animal are needed.

... more about:
»Pheromone »death »smell »urine

Chemical signals about pathology are typical not only of animals, but also of people. Back at the times when the main role in medicine was played not by devices and analysis, but by the doctor’s experience and intuition, physicians noted that the patients with different diseases have specific smells, and physicians even diagnosed by the smell of urine. And several days before the death, a specific smell appears with severely ill patients, the specialists calling the smell the harbinger of death.

Consequently, animals (probably likewise human beings) have the olfactory signal mechanism to inform about the critical state of the organism. It regulates animals’ behavior.

Nadezda Markina | alfa
Further information:
http://www.informnauka.ru

Further reports about: Pheromone death smell urine

More articles from Life Sciences:

nachricht A novel socio-ecological approach helps identifying suitable wolf habitats
17.02.2017 | Universität Zürich

nachricht New, ultra-flexible probes form reliable, scar-free integration with the brain
16.02.2017 | University of Texas at Austin

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Switched-on DNA

20.02.2017 | Materials Sciences

Second cause of hidden hearing loss identified

20.02.2017 | Health and Medicine

Prospect for more effective treatment of nerve pain

20.02.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>