Video Experimental Relacionado
Updated: Aug 8, 2026

13:15
Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
Published on: June 1, 2011
Los conmutadores conformacionales del ADN como sensores electrónicos sensibles de los analíticos
Richard P Fahlman1, Dipankar Sen
1Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
Journal of the American Chemical Society
|April 25, 2002
Resumen
El ADN el ADN el ADN el ADN.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Nanotecnología La nanotecnología es la nanotecnología.
- Los biosensores también son biosensores.
Sus antecedentes:
- La conductividad eléctrica del ADN varía con su conformación estructural.
- Esta propiedad puede utilizarse para desarrollar nuevos sensores electrónicos.
Objetivo del estudio:
- Para demostrar los cambios conformacionales del ADN para la detección del analito.
- Para presentar dos diseños distintos para sensores electrónicos basados en ADN.
- Explorar el potencial para la detección molecular automatizada basada en chips.
Principales métodos:
- Diseño de sensores de ADN con receptores de analito que alteran la conformación al unirse.
- Implementando dos diseños de sensores: uno donde la corriente fluye a través del receptor, otro adyacente a él.
- Utilizando cambios en la conducción eléctrica para señalar la presencia del analito.
Principales resultados:
- Ambos diseños de sensores permiten una conducción eléctrica significativa solo cuando el analito está unido.
- El primer diseño es adecuado para analíticos que contienen heterociclos como la adenosina.
- El segundo diseño ofrece una aplicación más amplia para varios analíticos moleculares.
Conclusiones:
- Los cambios conformacionales del ADN pueden aprovecharse eficazmente para la detección electrónica.
- Estos sensores de ADN ofrecen una vía para la detección rápida, automatizada y basada en chips de diversos analíticos.
- Los sensores desarrollados tienen aplicaciones potenciales en la detección de pequeñas moléculas, proteínas y macromoléculas.
Videos de Conceptos Relacionados
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...
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...
Southern Blot
Agarose gel electrophoresis is very useful in separating DNA fragments by size. Running a DNA ladder containing fragments of the known length alongside the sample helps determine the approximate length of the sample DNA fragments. However, additional steps are needed to verify the sequence identity of the sample DNA fragments.
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...
DNA Microarrays
Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
In-situ Hybridization
In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...
Single-Strand DNA Binding Proteins
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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...

