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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Connective tissues are one of the four main tissue types in humans that are extensively present in the body. They are characterized by cells embedded in an extracellular matrix (ECM) composed of a ground substance and three main types of protein fibers— collagen, elastic, and reticular fibers. The ground substance of connective tissues can range from a watery and jelly-like consistency to mineralized and hard. The wide variety of cells in the connective tissues include fibroblasts,...
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Iterative Optimization of DNA Duplexes for Crystallization of SeqA-DNA Complexes
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A duplex connection can further illuminate G-quadruplex/crystal violet complex.

Shuang Wang1, Jiahui Zhao, Shasha Lu

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin 130022, China. xryang@ciac.ac.cn.

Chemical Communications (Cambridge, England)
|January 25, 2019
PubMed
Summary

Duplex-connected G-quadruplex (dsG4) enhances crystal violet fluorescence more than pure G-quadruplex (G4). This finding reveals potential for detecting target nucleic acids.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Spectroscopy

Background:

  • G-quadruplex (G4) structures are nucleic acid secondary structures with biological relevance.
  • The interaction of G4 with small molecules can alter their properties, including fluorescence.

Purpose of the Study:

  • To investigate the effect of duplex-connected G-quadruplex (dsG4) on the fluorescent properties of crystal violet.
  • To explore the potential of dsG4-mediated fluorescence enhancement for nucleic acid detection.

Main Methods:

  • Fluorescence spectroscopy
  • Circular dichroism (CD) spectroscopy
  • Density functional theory (DFT) calculations

Main Results:

  • Duplex-connected G-quadruplex (dsG4) exhibits a significantly stronger promotion of crystal violet's fluorescent emission compared to pure G-quadruplex (G4).
  • Systematic investigation confirmed this novel phenomenon, providing insights into the structural and electronic interactions involved.
  • The observed fluorescence enhancement demonstrates potential for sensitive detection of specific nucleic acid sequences.

Conclusions:

  • dsG4 structures offer enhanced fluorescence modulation of crystal violet, surpassing that of G4 structures.
  • This dsG4-mediated phenomenon presents a promising avenue for developing novel biosensors for target nucleic acid detection.