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Related Concept Videos

Nucleic Acids02:43

Nucleic Acids

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
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Nucleic acids02:43

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
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Nucleic Acids and Nucleotides01:20

Nucleic Acids and Nucleotides

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its functioning. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
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Biosynthesis of Nucleic Acids01:28

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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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Updated: Feb 5, 2026

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection
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[Fluorescence Anisotropy and Applications Based on Functional Nucleic Acid Recognition].

Xi Wu, Xiao-jing Pei, Ruo-yun Lin

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
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    Fluorescence anisotropy, a method measuring light depolarization, aids in studying molecular interactions and target detection. Functional nucleic acid-based assays enhance selectivity and sensitivity for biological molecules.

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    Area of Science:

    • Biochemistry and Molecular Biology
    • Analytical Chemistry

    Background:

    • Fluorescence anisotropy (FA), or fluorescence polarization, measures light depolarization to study molecular interactions and target detection.
    • Pioneered by Gregorio Weber in the 1950s for biochemical applications, FA has evolved significantly.
    • Functional nucleic acids (FNAs), including aptamers and nucleic acid enzymes, have become crucial in sensing technologies since the early 1990s.

    Purpose of the Study:

    • To review the principles and designs of FA methods utilizing FNAs for studying and detecting biologically relevant proteins, nucleic acids, and small molecules.
    • To highlight the advantages of FNA-based FA assays, such as high selectivity, sensitivity, and throughput.
    • To address the challenge of enhancing FA changes for small molecule binding events.

    Main Methods:

    • Review of fluorescence anisotropy principles and instrumentation.
    • Analysis of FNA-based assay designs for molecular recognition.
    • Examination of applications in detecting proteins, nucleic acids, and small molecules.

    Main Results:

    • FA methods based on aptamer recognition offer high selectivity, sensitivity, and throughput for target detection.
    • FNAs provide a versatile platform for developing sensitive biosensors.
    • Enhancing FA signal changes for small molecule detection remains an area for development.

    Conclusions:

    • Fluorescence anisotropy, particularly when combined with functional nucleic acids, is a powerful technique for studying molecular interactions and detecting various biomolecules.
    • FNA-based FA assays are valuable tools in life science research and diagnostics.
    • Further research is needed to optimize FA signal amplification for small molecule sensing.