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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Imaging Biological Samples with Optical Microscopy01:18

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors
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Graphene Optical Biosensors.

Zongwen Li1, Wenfei Zhang2, Fei Xing3

  • 1School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255049, China. zwli@stumail.sdut.edu.cn.

International Journal of Molecular Sciences
|May 22, 2019
PubMed
Summary
This summary is machine-generated.

Graphene

Keywords:
Graphenebiosensorsopticalsurface wave

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Graphene's unique optical, electrical, and physical properties make it promising for biosensing.
  • Graphene exhibits broadband, tunable absorption and polarization-dependent effects, ideal for optical sensors.

Purpose of the Study:

  • To review recent advancements in graphene-based optical sensors and biosensors.
  • To highlight the capabilities of these sensors in detecting various biological targets and interactions.

Main Methods:

  • Review of recent scientific literature on graphene-based optical biosensors.
  • Analysis of sensor performance metrics such as sensitivity, detection speed, and real-time response.

Main Results:

  • Graphene-based optical biosensors demonstrate high performance for detecting single cells, cell lines, anticancer drugs, proteins, and antigen-antibody interactions.
  • These sensors excel at detecting surface structural changes and biomolecular interactions with ultra-fast, highly sensitive, and real-time responses.

Conclusions:

  • Graphene-based optical biosensors offer significant advantages for various biological detection applications.
  • The field shows strong potential for future innovations in high-performance, real-time biosensing.