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Related Concept Videos

Base Excision Repair01:54

Base Excision Repair

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
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Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
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Lewis Acids and Bases02:33

Lewis Acids and Bases

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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
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Weak Base Solutions03:21

Weak Base Solutions

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Acid–Base Equilibria: Activity-Based Definition of pH01:10

Acid–Base Equilibria: Activity-Based Definition of pH

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For an ideal solution, the pH is defined as the negative logarithm of the hydrogen ion concentration. For a non-ideal solution, an accurate measurement of the pH must consider the negative logarithm of the hydrogen ion activity rather than concentration. In such a solution, the pH can be more accurately defined as the negative logarithm of a product of the hydrogen ion concentration and its activity coefficient.
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Silver-Based Plasmonic Nanoparticles for and Their Use in Biosensing.

Alexis Loiseau1, Victoire Asila2, Gabriel Boitel-Aullen3

  • 1Laboratoire de Réactivité de Surface (LRS), Sorbonne Université, CNRS, UMR 7197, 4 place Jussieu, F-75005 Paris, France. alexis.loiseau@sorbonne-universite.fr.

Biosensors
|June 13, 2019
PubMed
Summary

Silver nanoparticles (AgNPs) are crucial for localized surface plasmon resonance (LSPR) biosensing. This review covers AgNP synthesis, coatings, and combinations with gold for advanced plasmonic biosensor applications.

Keywords:
LSPRalloybiosensorscoatingcore@shellsilver nanoparticlessynthesis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Localized surface plasmon resonance (LSPR) of metallic nanoparticles is key for chemical and biological sensing.
  • Functionalized nanoparticles enable selective molecule detection, bridging chemistry, biology, and materials science.
  • Gold (Au) and silver (Ag) nanoparticles offer tunable plasmonic properties influenced by size and shape.

Purpose of the Study:

  • To review silver-based nanoparticles for plasmonic biosensing applications.
  • To explore synthesis methods, coating strategies, and bimetallic (Ag-Au) nanoparticle applications.
  • To present examples of Ag and AgAu-based plasmonic biosensors.

Main Methods:

  • Review of synthesis techniques for controlled AgNP size, uniformity, and shape.
  • Exploration of organic, polymer, and inorganic coating strategies for AgNPs.
  • Analysis of Ag-Au alloy and core@shell nanoparticle structures for enhanced plasmonic properties.

Main Results:

  • AgNPs possess unique properties vital for plasmonic applications.
  • Coating strategies significantly influence the properties of Ag-based nanoparticles.
  • Bimetallic Ag-Au nanostructures offer advanced capabilities for biosensing.

Conclusions:

  • Silver nanoparticles are versatile platforms for LSPR-based biosensing.
  • Controlled synthesis and surface modification are critical for optimizing AgNP performance.
  • Ag-Au bimetallic systems represent a promising frontier in plasmonic biosensor development.