Frequency Scan
Frequency Scan - Related Videos
08:49
Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
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Cited by 2 •
2023
A multimodal, rapid hyperspectral imaging framework was developed to obtain broadband vibrational sum-frequency generation (VSFG) images, along with brightfield, second harmonic generation (SHG) imaging modalities. Due to the infrared frequency being resonant with molecular vibrations, microscopic structural and mesoscopic morphology knowledge is revealed of symmetry-allowed samples.
02:28
Leaky Scanning
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2020
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
08:27
Visualizing Stromule Frequency with Fluorescence Microscopy
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Cited by 5 •
2016
Protocols to investigate the dynamics of chloroplast stromules, the stroma-filled tubules that extend from the surface of chloroplasts, are described.
14:20
High-frequency Ultrasound Imaging of the Abdominal Aorta
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2023
Source: Amelia R. Adelsperger, Evan H. Phillips, and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana High-frequency ultrasound systems are used to acquire high resolution images. Here, the use of a state-of-the-art system will be demonstrated to image the morphology and hemodynamics of small pulsatile arteries and veins found in mice and rats. Ultrasound is a relatively inexpensive, portable, and versatile method for the noninvasive...
10:02
High-frequency Ultrasound Imaging of Mouse Cervical Lymph Nodes
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Cited by 6 •
2015
This protocol describes the application of high-frequency ultrasound (HFUS) for imaging mouse cervical lymph nodes. This technique optimizes visualization and quantification of cervical lymph node morphology, volume and blood flow. Image-guided biopsy of cervical lymph nodes and processing of lymph tissue for histological evaluation is also demonstrated.
FAQs
A Frequency Scan records a response profile rather than one isolated measurement. This shows whether parameters such as impedance, phase, amplitude, or stiffness change, remain stable, or shift as frequency varies. In cancer research, those patterns can provide a more complete basis for comparing biological samples and may reveal response features that would be invisible at a single selected frequency.
The recorded parameter determines which aspect of a sample’s response is being analyzed. Impedance and phase describe electrical behavior, while amplitude and stiffness capture other response dimensions associated with the applied stimulation. Examining these measurements across frequency produces complementary profiles, allowing investigators to select the response type most relevant to a characterization, comparison, or sensitivity objective.
The frequency range determines which portions of a sample’s response profile become visible. A range that includes informative changes can improve detection or measurement sensitivity, whereas a poorly chosen range may provide less useful separation between samples or conditions. Investigators can therefore examine frequency-dependent behavior to identify ranges that best support a particular cancer research measurement.
An instrument applies controlled stimulation to the sample while the frequency is varied across a selected range. During this sweep, the system records response parameters such as impedance, phase, amplitude, or stiffness. The resulting measurements are organized as a frequency-dependent profile, which can then be analyzed for sample characterization, comparison, or changes associated with treatment.
Researchers can obtain frequency-dependent profiles from normal and tumor-associated cells or tissues and compare their measured responses across the same range. Differences in impedance, phase, amplitude, or stiffness can support quantitative characterization of the samples. This approach contributes to cancer biology studies by examining properties that may not be adequately represented by a single measurement point.
Frequency scans can measure sample responses under different treatment conditions and compare the resulting profiles. A change across the frequency range may indicate that the drug or treatment altered the measured electrical, mechanical, or electromagnetic response. These comparisons support quantitative evaluation of treatment effects and can help researchers determine which frequency regions provide the clearest measurement sensitivity.
The resulting response profiles can support biomarker research, assay development, and quantitative analysis of cancer biology. They may also help investigators characterize cells and tissues, compare biological conditions, and identify frequency ranges that improve detection or measurement sensitivity. Consequently, frequency-scan data can contribute both to exploratory studies of cancer properties and to the design of analytical assays.