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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

23.9K
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.
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Binary Fission01:26

Binary Fission

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Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
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Binary Fission01:20

Binary Fission

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Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
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lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Related Experiment Video

Updated: Jan 30, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
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Transmission and radar cross-section reduction by combining binary coding metasurface and frequency selective

Fei-Fei Li, Wei Fang, Ping Chen

    Optics Express
    |January 18, 2019
    PubMed
    Summary
    This summary is machine-generated.

    A novel reflective metasurface utilizes a frequency-selective surface for high-efficiency transmission and broadband radar cross-section reduction. This design overcomes limitations of traditional lossy materials in advanced metasurface applications.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Surface Physics

    Background:

    • Metasurfaces offer unique electromagnetic properties but often rely on lossy materials.
    • Conventional reflective metasurfaces face limitations in achieving both high transmission and effective radar cross-section reduction simultaneously.

    Purpose of the Study:

    • To propose a modified reflective metasurface design overcoming drawbacks of conventional realizations.
    • To achieve high-efficiency transmission and broadband radar cross-section reduction using a novel structure.

    Main Methods:

    • Constructing a modified reflective metasurface by replacing the metal ground with a bandpass frequency-selective surface.
    • Characterizing the metasurface's transmission and radar cross-section reduction capabilities.

    Main Results:

    • The modified metasurface exhibits high-efficiency transmission in the frequency-selective surface's passband (-0.24 dB at 4.6 GHz).
    • Achieved broadband radar cross-section reduction of -15 dB from 8.5 to 13.5 GHz.
    • Demonstrated overcoming limitations associated with lossy materials in conventional metasurfaces.

    Conclusions:

    • The proposed modified metasurface effectively integrates high-efficiency transmission and broadband radar cross-section reduction.
    • This advancement offers a promising solution for next-generation metasurface applications, particularly in stealth and communication technologies.