まとめ
研究者らは,鳩や雀の首筋に永久磁石物質を発見した. この発見は,鳥が航海のために地球の磁場をどのように感知するかを説明するかもしれない.
科学分野:
- 鳥類学 鳥類学とは,鳥類学である.
- バイオフィジックス 生物物理学
- 動物の行動 動物の行動
背景:
- 地球の強さの磁場は,帰還と移住の間に鳥の方向性に影響を及ぼすことが実証されています.
- 非常に敏感な磁気受容体は,これらのナビゲーション効果を媒介すると仮定されています.
- 以前の研究では,ハチミツや旅鳩に磁石が残っていることが示され,磁石物質が関与していることを示唆していた.
研究 の 目的:
- 鳥の首筋に永磁性物質が存在するかどうかを調査する.
- マグネトレセプションメカニズムとしての筋肉受容体に結合した磁気粒子の潜在的な役割を調査する.
主な方法:
- 鳩 (Columba livia) の首筋に永久磁石物質が検出されました.
- 移住する白冠鳥 (Zonotrichia leucophrys) の首筋に永久磁気物質が検出されました.
主要な成果:
- 研究した2種類の鳥の首の筋肉の中に永久磁石物質が存在することを確認した.
- この発見は,磁気受容に寄与する磁気粒子の仮説を支持する.
結論:
- 磁気物質の検出は,鳥類の磁気受容のための新しいメカニズムを示唆しています.
- このメカニズムは,磁気粒子が,スパインドルのような筋肉受容体と結合することを含むかもしれません.
- このようなシステムは,鳥の磁場検出に関連する行動観察を説明できる.
さらに関連する動画
05:26Low-Cost Electroencephalographic Recording System Combined with a Millimeter-Sized Coil to Transcranially Stimulate the Mouse Brain In Vivo
Published on: May 26, 2023
04:30Stimulated Single Fiber Electromyography (SFEMG) for Assessing Neuromuscular Junction Transmission in Rodent Models
Published on: March 8, 2024
関連する概念動画
01:05Atomic Nuclei: Magnetic Resonance
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
01:30Magnetism
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
01:28Magnetic Fields
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
01:30Paramagnetism
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
01:31Magnetic Susceptibility and Permeability
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...