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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

24.0K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.0K
What is Natural Selection?01:32

What is Natural Selection?

129.0K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
129.0K
Antibiotic Selection00:57

Antibiotic Selection

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Overview
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What is a Frequency Distribution00:51

What is a Frequency Distribution

27.2K
A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
27.2K
Mean From a Frequency Distribution01:11

Mean From a Frequency Distribution

22.6K
Sometimes, data gathered from an experiment on a large sample or population are organized into concise tables. In such cases, the frequency of the quantitative data set is plotted in the form of a table. Or else, the data values are grouped into the quantity’s intervals, which form classes, and their respective frequencies are known. That is, the data values are distributed over different categories or classes. This is known as frequency distribution.
When such a data set is encountered,...
22.6K
Types of Selection01:46

Types of Selection

45.0K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
45.0K

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Related Experiment Video

Updated: Jan 31, 2026

Thermal Ablation for the Treatment of Abdominal Tumors
07:16

Thermal Ablation for the Treatment of Abdominal Tumors

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[Frequency-Selectable RF Ablation Treatment System].

Jincheng Zou1, Aili Zhang1

  • 1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030.

Zhongguo Yi Liao Qi Xie Za Zhi = Chinese Journal of Medical Instrumentation
|December 19, 2018
PubMed
Summary
This summary is machine-generated.

This study presents a new radiofrequency ablation system capable of generating variable frequencies for precise tissue ablation. Higher frequencies resulted in decreased temperature and ablation area when using constant power control.

Keywords:
Class E tuned power amplifierRF Ablationfrequency-selectable

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Area of Science:

  • Medical Devices
  • Biomedical Engineering
  • Radiofrequency Ablation Technology

Background:

  • Precise conformal ablation of targeted tissue is crucial for advanced radiofrequency ablation (RFA) treatments.
  • Existing RFA systems may lack the flexibility to adapt frequencies for optimized therapeutic outcomes.

Purpose of the Study:

  • To develop and validate a frequency-selectable radiofrequency ablation system.
  • To investigate the impact of varying radiofrequency currents on tissue heating and ablation characteristics.

Main Methods:

  • A Class E power amplifier-based system controlled by an MSP430 microcontroller with a touchscreen interface was designed.
  • Radiofrequency (RF) signals at 230 kHz, 460 kHz, 920 kHz, and 2000 kHz were generated and tested.
  • Tissue phantoms were used to evaluate the heating efficacy of RF signals at 460 kHz, 920 kHz, and 2000 kHz.

Main Results:

  • The system successfully generated RF signals at the tested frequencies.
  • The developed RFA system demonstrated effective tissue heating at 460 kHz, 920 kHz, and 2000 kHz.
  • Constant power control showed that increasing RF frequency led to reduced maximum temperature and ablation area.

Conclusions:

  • The frequency-selectable RFA system is feasible for supporting new treatment studies.
  • The findings provide insights into optimizing RFA parameters for precise tissue ablation.
  • Further research can explore the clinical applications of frequency-modulated RFA.