The reindeer`s antlers make the beauty and the pride of a male, being a reliable weapon during spring tournaments. In autumn the antlers are no longer needed, so reindeers shed the antlers and grow them up anew in the next season. With the majority of the reindeer types, the male sex hormones control the growth of the antlers. But the reindeer`s doe has also got antlers. A pregnant doe carries antlers throughout winter, as the antlers help a doe to get food from under the snow, to keep off predators and males carrying no antlers, so that they would not interfere with the doe`s pasturing. The scientists have found out that the females` antlers growth mainly depends on the estradiol (female sex hormone) action.
The case with the males is not that simple. When the males are on heat, that being the period of the most rapid growth of the antlers, the concentration of several hormones, both male and female, increases in the reindeers` blood, that is why it is difficult to judge which specific hormone expedites the antlers` growth. The Soviet biologist I. I. Shmalgauzen assumed in his studies that not only the reindeer sex glands effected the antlers` growth, but the antlers when growing also produced the hormones which regulate the sex gland function. The research carried out by M.F. Borisenkov (Institute of Physiology, Komi Scientific Center, Ural Branch, Russian Academy of Sciences, Syktyvkar) has proved that the newly-growing antlers` cutting off changes the hormone status of the organism, although it does not impact the testicle endocrine function.
The research was carried out on the adult males from the deer-raising agricultural co-operative farm called `Olenevod`, town of Vorkuta. In June, 1.5-2 months after the mass fawning, the farm staff fulfilled the regular cutting of the reindeers` antlers taking proper care of the wounds. A day after the operation the concentration of progesterone hormone increased in the blood serum of all the animals, for the non- emasculated animals this effect lasting four months, till autumn. After that no more blood tests were taken. In autumn the males which are lucky to retain the antlers that long normally shed them. This is a natural process, driving no hormonal surges.
Tatiana Pitchugina | alphagalileo
First time-lapse footage of cell activity during limb regeneration
25.10.2016 | eLife
Phenotype at the push of a button
25.10.2016 | Institut für Pflanzenbiochemie
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Earth Sciences
25.10.2016 | Power and Electrical Engineering
25.10.2016 | Process Engineering