raziskave

Bee going to sting woman on light blue background, closeup / Foto: Liudmila Chernetska

Matematiki narave

Čebele znajo šteti: nova raziskava razkriva presenetljivo numerično inteligenco domačih čebel

prenos znanja

Inovacije, most med znanostjo in gospodarstvom

Fat diet and scale feet standing on electronic scales for weight control. Measurement instrument in kilogram for a diet control.

Zdravje

Kdaj se zredimo, je ključno: zgodnja debelost je najnevarnejša

Brain Swirl. 3D illustration of human head with color motion trails for subjects on art, psychology, creativity, imagination and dreams.

sinestezija

Zakaj lahko nekateri ljudje slišijo barve in okušajo besede?

beautiful brunette smoke electronic cigarette in public places / Foto: Igor Ilkov

Nenavadno

Kot noži proti mitraljezom: mit o manj nevarnem vejpanje ne zdrži

raziskava

So manj inteligentni ljudje res bolj srečni?

Gastroenterologist holds in hands models of organs for examination. Medical insurance, healthcare and internal organs / Foto: Nadzeya Haroshka Getty Images

Nenavadno

Bodo milijarderji kmalu »gojili« brezglava človeška telesa za rezervne dele?

- 20.01.2015 - plakat Konoplja zdravi, zaupaj naravi. - Društvo SKSK -Slovenski konopljin socialni klub - legalizacija - reklamni pano - oglaševanje - grafiti - plakatno mesto podjetja TAM-TAM //FOTO: Tomaž Skale / Foto: Tomaž Skale

razprava

Kdo razume dokaze – in kdo jih prehiteva? Konoplja med znanostjo, stroko in izkušnjo

**VIDEO AVAILABLE: CONTACT INFO@COVERMG.COM TO RECEIVE**BY MARK WORGANOctopuses have a special 'sex arm' they use to identify partners by taste and mate with them, according to researchers at Harvard University.The findings, published in the journal Science, show that males can locate and fertilise females without seeing them, sometimes mating at arm's length.Scientists say the research sheds new light on how these largely solitary animals reproduce, and may help explain how new species evolve.Male octopuses have eight arms, but one - known as the hectocotylus - is specially adapted for reproduction."Male octopuses use a specialized arm called the hectocotylus to identify females and navigate their internal organs to reach the oviduct and deliver sperm," the researchers, led by lead author Pablo Villar, write in their paper.During mating, the arm searches for the female's mantle cavity and deposits packets of sperm, known as spermatophores. The researchers found that the arm is lined with receptors similar to those used by other arms to explore the seabed.Octopus limbs are highly sensitive, with each suction cup containing thousands of sensory cells. Much of the animal's nervous system is distributed throughout its arms, allowing them to act independently of the brain.To test how the animals use these abilities, scientists observed mating behaviour in the California two-spot octopus (Octopus bimaculoides).Males and females were placed on opposite sides of a tank, separated by a barrier with small openings. Despite being unable to see each other, males were able to extend their specialised arm through the divider, locate the female and begin mating.The study found that such interactions could take place even in complete darkness. When two males were paired, however, no mating attempts were observed, suggesting females emit a specific chemical signal.Further experiments pointed to the hormone progesterone as a key factor.Research

odkritje

Ljubezen na dosegu roke: lovka hobotnice je jezik in spolni organ hkrati