Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

The Looking Glass Self01:28

The Looking Glass Self

304
The concept of the looking-glass self describes how an individual's self-concept is shaped by their perception of how others see them. This psychological theory, first introduced by sociologist Charles Horton Cooley in 1902, posits that self-identity emerges in a social context and is influenced by the judgments—real or imagined—of others.Research suggests that individuals frequently overestimate how positively others perceive them. This is particularly evident in physical...
304
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.0K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.0K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.4K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.6K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.6K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Overlap locking and nonperturbative effects in spin glasses.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Outcomes of Hormone receptor-positive/HER2-negative early breast cancer patients by risk of recurrence groups focusing on the intermediate-risk group: Retrospective analysis from GEICAM studies.

Breast cancer research : BCR·2026
Same author

Demonstrating real advantage of machine learning-enhanced Monte Carlo for combinatorial optimization.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Perioperative Interventions Based on Fasting Protocols and Carbohydrate Loading in Non-Cardiac Surgery in Older Adults: A Scoping Review.

Medicina (Kaunas, Lithuania)·2026
Same author

Predictability of complex networks.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Accuracy of large language models in interpreting urological clinical guidelines: a comparative study with expert evaluation.

Therapeutic advances in urology·2026
Same journal

Tau protein as a regulator of mitochondrial function and dynamics.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same journal

A scalable, dividing cell model for the robust propagation and quantification of human sporadic Creutzfeldt-Jakob disease prions.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same journal

Epigenetic regulation of mesenchymal BMP signaling directs postnatal organ innervation.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same journal

Single-shot wide-field biochemical imaging at 1 kHz frame rate.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same journal

Morphogenesis and topological evolution of a frustrated nematic liquid crystal under confinement.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same journal

B cell-intrinsic CXCR3 drives efficient generation of ectopic pulmonary germinal center responses to influenza A virus infection.

Proceedings of the National Academy of Sciences of the United States of America·2026
See all related articles

Related Experiment Video

Updated: Jan 22, 2026

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice
13:34

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice

Published on: June 4, 2020

8.8K

The Mpemba effect in spin glasses is a persistent memory effect.

Marco Baity-Jesi1,2, Enrico Calore3,4, Andres Cruz2,5

  • 1Department of Chemistry, Columbia University, New York, NY 10027.

Proceedings of the National Academy of Sciences of the United States of America
|July 18, 2019
PubMed
Summary
This summary is machine-generated.

The Mpemba effect, where hot water cools faster than cold, is a nonequilibrium process in spin glasses. This phenomenon is governed by the system's coherence length (ξ) within the glassy phase.

Keywords:
Mpemba effectmemory effectsnonequilibrium physicsspin glasses

More Related Videos

A Real-world What-Where-When Memory Test
09:13

A Real-world What-Where-When Memory Test

Published on: May 16, 2017

12.0K
A Zebrafish Model of Diabetes Mellitus and Metabolic Memory
10:03

A Zebrafish Model of Diabetes Mellitus and Metabolic Memory

Published on: February 28, 2013

26.5K

Related Experiment Videos

Last Updated: Jan 22, 2026

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice
13:34

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice

Published on: June 4, 2020

8.8K
A Real-world What-Where-When Memory Test
09:13

A Real-world What-Where-When Memory Test

Published on: May 16, 2017

12.0K
A Zebrafish Model of Diabetes Mellitus and Metabolic Memory
10:03

A Zebrafish Model of Diabetes Mellitus and Metabolic Memory

Published on: February 28, 2013

26.5K

Area of Science:

  • Condensed Matter Physics
  • Thermodynamics
  • Statistical Mechanics

Background:

  • The Mpemba effect describes the counterintuitive observation of hot water cooling faster than cold water under identical conditions.
  • This phenomenon has been observed across various systems but lacks a universally accepted explanation.
  • Understanding the underlying physics is crucial for fields ranging from materials science to astrophysics.

Purpose of the Study:

  • To investigate the Mpemba effect in spin glasses using advanced computational methods.
  • To determine the key physical parameters governing the Mpemba effect in this specific system.
  • To explore the relationship between the Mpemba effect and the concept of coherence length in glassy systems.

Main Methods:

  • Utilized the custom-built supercomputer Janus II for simulations.
  • Studied the Mpemba effect in the context of spin glass physics.
  • Analyzed the role of coherence length (ξ) in the cooling dynamics.

Main Results:

  • Demonstrated that the Mpemba effect in spin glasses is a nonequilibrium process.
  • Identified the coherence length (ξ) as the governing parameter.
  • Established that the effect occurs when the bath temperature is within the glassy phase, irrespective of crossing the critical temperature.
  • Revealed a strong correlation between internal energy and coherence length (ξ) as a signature of the glassy phase.

Conclusions:

  • The Mpemba effect in spin glasses is fundamentally linked to the coherence length (ξ).
  • The study provides a new perspective on the Mpemba effect as a probe for investigating coherence length in supercooled liquids and glass formers.
  • This research opens avenues for experimental studies on glassy dynamics and phase transitions.