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Related Concept Videos

Sensory Modalities01:15

Sensory Modalities

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Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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.
CFT focuses on...
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Integration by Parts: Indefinite Integrals01:26

Integration by Parts: Indefinite Integrals

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Integration by parts is a fundamental technique in calculus for evaluating integrals involving the product of two functions. It is particularly useful when direct integration is not feasible. The method is based on the product rule for differentiation, which states that the derivative of a product equals the derivative of the first function times the second, plus the first function times the derivative of the second. By integrating this identity and rearranging terms, the integration by parts...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
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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Integrated dual-modality microfluidic sensor for biomarker detection using lithographic plasmonic crystal.

Md Azahar Ali1, Shawana Tabassum, Qiugu Wang

  • 1Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011, USA. ldong@iastate.edu.

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This study presents a novel dual-modality microfluidic sensor chip using gold and graphene oxide nanoposts for sensitive biomarker detection. The integrated sensor provides both electrochemical and surface plasmon resonance signals for enhanced diagnostics.

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Microfluidics

Background:

  • Biomarker detection requires sensitive and accurate methods.
  • Existing sensors often lack dual-modality capabilities for comprehensive analysis.
  • Microfluidic devices offer advantages in sample handling and analysis speed.

Purpose of the Study:

  • To develop an integrated dual-modality microfluidic sensor chip.
  • To detect target biomarker molecules with high sensitivity and reproducibility.
  • To combine electrochemical and surface plasmon resonance (SPR) sensing modalities on a single chip.

Main Methods:

  • Fabrication of a microfluidic chip with patterned periodic arrays of gold (Au) and graphene oxide (GO) nanoposts.
  • Functionalization of Au-GO nanoposts with specific receptor molecules.
  • Simultaneous detection of biomarker signals using electrochemical and SPR techniques.
  • Utilizing soft lithography for reproducible nanopost formation.

Main Results:

  • The sensor chip demonstrated high sensitivity for detecting epidermal growth factor receptor (ErbB2) down to femtomolar levels.
  • Electrochemical measurements showed sensitivity of 20.47 μA μM⁻² cm⁻² for ErbB2.
  • SPR measurements provided dynamic tracking of antigen-antibody interactions.
  • High reproducibility of sensor response was achieved.

Conclusions:

  • The integrated dual-modality microfluidic sensor chip offers enhanced sensitivity and dynamic analysis capabilities.
  • This platform enables simultaneous detection using a single sensing area and minimal sample volume.
  • The sensor shows promise for advanced diagnostic applications.