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Related Concept Videos

Pulse01:16

Pulse

2.0K
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
2.0K
Pulse01:05

Pulse

3.5K
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
3.5K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.7K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.7K
Pulse Oximetry01:24

Pulse Oximetry

1.3K
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
1.3K
Regulation of Pulse01:20

Regulation of Pulse

2.2K
Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
2.2K
Pulse rhythm01:30

Pulse rhythm

1.3K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.3K

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Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry
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Quadrature-based interferometry using pulsed RGB illumination.

Markus Schake, Peter Lehmann

    Optics Express
    |June 6, 2019
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    Summary
    This summary is machine-generated.

    This study presents a new method for fast surface phase retrieval using a novel RGB-interferometer setup. The technique achieves high precision for measuring moving or vibrating samples.

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    Area of Science:

    • Optical Metrology
    • Interferometry
    • Phase Retrieval

    Background:

    • Traditional interferometry struggles with dynamic measurements.
    • Fast and precise phase retrieval is crucial for analyzing moving surfaces.

    Purpose of the Study:

    • To develop a novel image recording approach for phase retrieval in an RGB-interferometer.
    • To enable high-speed, high-precision surface topography measurements.

    Main Methods:

    • Utilized pulsed LED illumination synchronized with a Bayer-Pattern CMOS RGB camera.
    • Implemented a quadrature method for recording two phase-shifted images within the camera's exposure gap.
    • Achieved effective acquisition times below 100 μs.

    Main Results:

    • Demonstrated surface phase retrieval with a standard deviation of approximately 3-5 nm.
    • Validated the applicability of reconstructed phase data for ambiguity range extension algorithms.
    • Successfully measured the topography of samples subjected to motion and mechanical vibrations.

    Conclusions:

    • The proposed RGB-interferometer setup enables rapid and precise phase retrieval.
    • This method is suitable for measuring the topography of dynamic or vibrating surfaces.
    • The technique offers a feasible solution for real-time surface analysis.