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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
Reporter Genes02:11

Reporter Genes

Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
Commonly used reporter...
Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Related Experiment Video

Updated: Jun 4, 2026

Detection of Bacteria Using Fluorogenic DNAzymes
13:20

Detection of Bacteria Using Fluorogenic DNAzymes

Published on: May 28, 2012

Fluorescent DNA-based enzyme sensors.

Nan Dai1, Eric T Kool

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305, USA.

Chemical Society Reviews
|February 4, 2011
PubMed
Summary
This summary is machine-generated.

DNA-based fluorescent sensors are advancing beyond traditional enzyme monitoring. Novel nucleic acid sensors offer advantages like water solubility and easier synthesis for diverse enzymatic applications.

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Last Updated: Jun 4, 2026

Detection of Bacteria Using Fluorogenic DNAzymes
13:20

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Published on: May 28, 2012

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10:05

Colorimetric Detection of Bacteria Using Litmus Test

Published on: September 17, 2016

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Sensing

Background:

  • Fluorescent sensors utilizing DNA structures are valuable tools for enzyme activity monitoring.
  • Initial research focused on enzymes with natural DNA/RNA substrates.
  • Recent molecular design innovations expand sensor applications to non-nucleic acid-binding enzymes.

Purpose of the Study:

  • To provide a critical review of developing strategies for nucleic acid-based fluorescent sensors.
  • To discuss the potential advantages of nucleic acid sensors over traditional small-molecule sensors.
  • To explore future directions in microarrays, single-molecule analysis, and in vivo sensing.

Main Methods:

  • Review of recent literature on DNA-based fluorescent sensor development.
  • Analysis of molecular design strategies for novel sensor applications.
  • Discussion of advancements in sensor platforms and in vivo applications.

Main Results:

  • Nucleic acid sensors demonstrate versatility beyond enzymes naturally interacting with DNA/RNA.
  • Advantages such as water solubility and simplified synthesis are highlighted.
  • Emerging strategies enable broader applications in enzymatic activity monitoring.

Conclusions:

  • DNA-based fluorescent sensors represent a rapidly evolving field with significant potential.
  • The development of nucleic acid sensors broadens the scope of enzymatic activity monitoring.
  • Future advancements are expected in high-throughput, single-molecule, and in vivo sensing applications.