Hello everyone, thank you for the invitation. Today I would like to share with you the question of how many cells are killed by an NMR, as well as some confusion about whether the NMR machine can be stopped. If you still If you don’t understand it well, it doesn’t matter, because I will share it with you next. I hope it can help you and solve your problems. Let’s get started!
Contents of this article
One , Can the NMR machine not be stopped?
Cannot be stopped. The NMR machine is an advanced research tool used to collect information on cellular and molecular structures. It cannot be stopped. . It can adjust and optimize experimental results by controlling temperature, pressure, oscillator power and sampling rate. NMR machines play a vital role in scientific research and therefore cannot be stopped.
2. Chemistry What is Nuclear Magnetic Resonance
1. Nuclear Magnetic Resonance Refers to the phenomenon that a nuclear spin system in a static magnetic field receives electromagnetic waves when its Larmor precession frequency is equal to the frequency of the radio frequency field affecting the system. The positively charged nucleus is magnetic when it rotates. It is deflected due to the influence of torque on the equatorial plane of the magnetic field. The result is that the nuclear magnetic moment rotates around the direction of the magnetic field. This is Larmor precession (or Larmor precession). ).
2. Since the nuclear magnetic moment tends to be parallel to the orientation of the magnetic field, after a moment, the spin nucleus is no longer affected by the torque, Larmor Precession is stopped. If a radio frequency field with the same frequency as the precession frequency is added in the direction of the vertical magnetic field, the nuclear magnetic moment will leave the equilibrium position, and Larmor precession will start again. The speed of nuclear \”rotation\” is constant. As long as the magnetic field intensity remains unchanged, the Larmor frequency will not change from beginning to end.
3. The magnetic moment of a certain magnetic nucleus can take the direction of the paramagnetic field (belonging to a low-energy state) or the direction of the reverse magnetic field (belonging to a high-energy state) in the magnetic field. state). If a radio frequency field is added in the direction perpendicular to the magnetic field, when the frequency of the radio frequency field is equal to the Larmor frequency of the nucleus, the nuclei in the low energy state will receive the radio frequency energy and transition from the low energy state to the high energy state. This is \” Nuclear Magnetic Resonance\” phenomenon. When radio frequency is interrupted, atomsThe nuclei release the energy they receive, and the intensity of the release is a sign of their respective characteristics, that is, a mark of quite normal (healthy) conditions.
4. \”Nuclear magnetic resonance scanning\” (NMR for short) developed based on this principle is a new type of tomographic imaging technology that can be used for many objects Determination of structure, such as compound structure, crystallinity of polymer compounds, three-dimensional configuration components of polymer chains, drug ingredients, structure of biological molecules, interaction between drugs and biological molecules, cell receptors, water content of biological tissues , cancer diagnosis, human NMR tomography (NMR-CT), etc.
This ends the introduction on how many cells can be killed by a single nuclear magnetic resonance and whether the nuclear magnetic resonance machine can be stopped. I hope it will be helpful to everyone.
