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Related Concept Videos

Urine Studies II: Urine Culture and Sensitivity Test01:26

Urine Studies II: Urine Culture and Sensitivity Test

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A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
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Sensitivity, Specificity, and Predicted Value01:13

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In healthcare diagnostics, laboratory tests play a crucial role in identifying and diagnosing a wide range of medical conditions. However, interpreting test results is not always straightforward. An abnormal test result does not always confirm the presence of a disease, just as a normal result does not guarantee its absence. To assess the reliability of these diagnostic tools, healthcare practitioners rely on two key statistical indicators: sensitivity and specificity.
Sensitivity is the...
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Sputum Studies II: Culture and Sensitivity01:20

Sputum Studies II: Culture and Sensitivity

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Description
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Precipitation Reactions

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In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Related Experiment Video

Updated: Jan 28, 2026

Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation

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Highly sensitive plasmonic silver nanorods.

Arpad Jakab1, Christina Rosman, Yuriy Khalavka

  • 1MAINZ Graduate School of Excellence and Institute of Physical Chemistry, University of Mainz, Jakob-Welder-Weg 11, 55128 Mainz, Germany.

ACS Nano
|August 20, 2011
PubMed
Summary
This summary is machine-generated.

Silver nanorods exhibit superior plasmonic sensitivity compared to gold nanorods, offering a 1.2 to 2 times higher response. This enhanced sensitivity in silver nanoparticles is attributed to their electronic properties, improving sensor performance.

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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Area of Science:

  • Nanotechnology
  • Plasmonics
  • Materials Science

Background:

  • Localized surface plasmons (LSPs) are sensitive to the surrounding dielectric environment.
  • Noble metal nanoparticles, such as gold and silver, are widely used as plasmonic sensors.
  • Understanding the factors influencing plasmonic sensitivity is crucial for sensor development.

Purpose of the Study:

  • To compare the single-particle plasmonic sensitivity of silver and gold nanorods.
  • To investigate the underlying mechanisms responsible for differences in sensitivity.
  • To enhance the reversibility of silver nanorod-based sensors.

Main Methods:

  • Experimental measurement of plasmon resonance shift in silver and gold nanorods.
  • Environmental change from water to 12.5% sucrose solution.
  • Simulations using the boundary-element-method (BEM).
  • Application of the Drude model and quasi-static approximation (QSA).

Main Results:

  • Silver nanorods demonstrated 1.2 to 2 times higher plasmonic sensitivity than gold nanorods.
  • Simulations confirmed higher sensitivity for silver, attributed to lower d-band electron polarizability.
  • A simple formula for plasmonic sensitivity was derived.
  • Improved sensor reversibility was achieved by filtering illumination light.

Conclusions:

  • Silver nanorods are more sensitive plasmonic sensors than gold nanorods.
  • The electronic structure of the metal significantly impacts plasmonic sensitivity.
  • Optimized illumination filtering can enhance the stability and reusability of silver nanorod sensors.