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

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an organic...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

You might also read

Related Articles

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

Sort by
Same author

SIRT4 Alleviates Retinal Ischemia-Reperfusion Injury Via Mediating Astrocytes Lipid Metabolism and Mitochondrial Function.

Investigative ophthalmology & visual science·2026
Same author

Cortical gradient compression links cognition and transcriptomic signatures in primary angle-closure glaucoma.

Communications biology·2026
Same author

Altered amplitudes of low-frequency fluctuations in primary open angle glaucoma patients: a resting-state fMRI study.

International journal of ophthalmology·2026
Same author

Phacoemulsification combined with goniosynechialysis for acute angle-closure glaucoma: impact of preoperative IOP status.

BMC ophthalmology·2025
Same author

Validation and Application of the Simplified Chinese Version of the Dyspnea-12 Questionnaire: An Independent Predictor for Hospitalization Risk in Chronic Obstructive Pulmonary Disease.

International journal of chronic obstructive pulmonary disease·2025
Same author

Abnormal topological properties and functional-structural coupling of large-scale brain networks in primary angle-closure glaucoma.

Quantitative imaging in medicine and surgery·2025
Same journal

The Laser Rangefinder System in Quadrature Modem and Ambiguity Resolution.

Guang pu xue yu guang pu fen xi = Guang pu·2018
Same journal

Improving the Accuracy of Camera-Based Heart Rate Measurement.

Guang pu xue yu guang pu fen xi = Guang pu·2018
Same journal

Determination of Pb, Cr, Cd, and As in Aluminum-Plastic Packaging Materials via Inductively Coupled Plasma-Mass Spectrometry with Microwave Digestion.

Guang pu xue yu guang pu fen xi = Guang pu·2018
Same journal

Study on Molecular Recognition of Cucurbit[6]uril with Oxytetracycline Molecules by Spectroscopic Methods.

Guang pu xue yu guang pu fen xi = Guang pu·2018
Same journal

Preparation and Properties of Novel Polymer Blue Fluorescent Materials.

Guang pu xue yu guang pu fen xi = Guang pu·2018
Same journal

Effect of the Nitrogen Incorporation on the Microstructure and Photoelectric Properties of N Type Nanocrystalline Silicon Thin Films.

Guang pu xue yu guang pu fen xi = Guang pu·2018
See all related articles

Related Experiment Video

Updated: May 20, 2026

Dynamic Inter-subject Functional Connectivity Reveals Moment-to-Moment Brain Network Configurations Driven by Continuous or Communication Paradigms
08:36

Dynamic Inter-subject Functional Connectivity Reveals Moment-to-Moment Brain Network Configurations Driven by Continuous or Communication Paradigms

Published on: March 21, 2019

[Contrastive study on dynamic spectrum extraction method].

Gang Li1, Mei Zhou, Hui-quan Wang

  • 1School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China. ligang59@tju.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|July 26, 2012
PubMed
Summary
This summary is machine-generated.

Dynamic spectrum analysis offers noninvasive blood component detection. Single-trial estimation in the time domain provides more accurate dynamic spectrum extraction from unstable pulse waves compared to frequency domain analysis.

More Related Videos

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis
05:48

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

Published on: August 9, 2024

Related Experiment Videos

Last Updated: May 20, 2026

Dynamic Inter-subject Functional Connectivity Reveals Moment-to-Moment Brain Network Configurations Driven by Continuous or Communication Paradigms
08:36

Dynamic Inter-subject Functional Connectivity Reveals Moment-to-Moment Brain Network Configurations Driven by Continuous or Communication Paradigms

Published on: March 21, 2019

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis
05:48

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

Published on: August 9, 2024

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Dynamic spectrum methods enable noninvasive detection of blood components by analyzing absorbance at specific wavelengths.
  • These methods aim to mitigate influences from measurement conditions, individual variations, and spectral overlap.
  • Choosing the optimal dynamic spectrum extraction technique is crucial for analyzing weak ingredient signals.

Purpose of the Study:

  • To compare and analyze two primary methods for dynamic spectral signal extraction: frequency domain analysis and single-trial estimation in the time domain.
  • To evaluate the effectiveness of each method under varying pulse wave stability conditions.

Main Methods:

  • Theoretical analysis of dynamic spectrum extraction principles.
  • Experimental comparison of frequency domain analysis and single-trial estimation using pulse wave data.
  • Assessment of signal statistical and average properties.

Main Results:

  • Both frequency domain analysis and single-trial estimation are fundamentally based on the principles of dynamic spectrum and signal properties.
  • High-precision dynamic spectra can be obtained by both methods when pulse waves are stable.
  • Single-trial estimation demonstrates superior accuracy over frequency domain analysis when pulse waves are unstable due to factors like finger movement or pressure changes.

Conclusions:

  • Frequency domain analysis and single-trial estimation offer different perspectives but share core principles for dynamic spectrum extraction.
  • Single-trial estimation is the preferred method for accurate dynamic spectrum analysis of unstable pulse waves in noninvasive blood component detection.