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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Atomic Nuclei: Nuclear Spin01:08

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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...
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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Exotic nuclear spin behavior in dendritic macromolecules.

Philip Saul1,2, Shengjun Yang1,2, Salvatore Mamone1,2

  • 1Research Group for NMR Signal Enhancement, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. stefan.gloeggler@mpibpc.mpg.de.

Physical Chemistry Chemical Physics : PCCP
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Summary
This summary is machine-generated.

Nuclear spins in dendrimers exhibit unique behavior with copper ions, unlike simple peptides. This discovery enables the development of novel Cu(II) selective probes and potential in vivo NMR applications.

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Area of Science:

  • Macromolecular chemistry
  • Nuclear magnetic resonance (NMR) spectroscopy
  • Biophysical chemistry

Background:

  • Dendrimers are highly branched macromolecules with diverse applications, including drug delivery and sensing.
  • Long-lived nuclear singlet states are quantum states of nuclear spins with potential applications in NMR.
  • Paramagnetic ions can influence nuclear spin dynamics, but their effects on dendrimers are not well understood.

Purpose of the Study:

  • To investigate the behavior of nuclear spins within a dendritic macromolecule in the presence of various paramagnetic ions.
  • To explore the potential of dendrimers as platforms for developing selective probes and for in vivo NMR applications.

Main Methods:

  • Synthesis of a dendritic macromolecule with a nuclear singlet multimer (NUSIMER).
  • Nuclear magnetic resonance (NMR) studies to assess the stability of the nuclear singlet state in the presence of different paramagnetic ions (e.g., Cu(II)).
  • Cellular uptake studies using a fluorescent marker and confocal microscopy.
  • In vitro NMR experiments with NUSIMER in living cells.

Main Results:

  • The stability of the long-lived nuclear singlet state in the dendrimer was uniquely affected by Cu(II) ions, while other ions had no significant influence.
  • This selective effect was not observed in a simple tripeptide, suggesting a specific interaction with the dendritic structure.
  • The NUSIMER was successfully internalized by living cells.
  • NMR investigation of NUSIMER within living cells demonstrated the feasibility of in vivo NMR applications.

Conclusions:

  • Dendrimers exhibit exotic nuclear spin behavior influenced by specific paramagnetic ions like Cu(II).
  • This finding opens avenues for developing Cu(II)-selective probes based on dendritic structures.
  • The cellular uptake and in vivo NMR feasibility suggest potential applications of dendrimers in advanced biomedical imaging and diagnostics.