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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.

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Customizable Nichrome Wire Heaters for Molecular Diagnostic Applications.

Juhee Lim1, Won Han1, Le Tran Huy Thang1

  • 1Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan 48513, Republic of Korea.

Biosensors
|March 27, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a novel, cost-effective method for creating custom heaters using nichrome wire for point-of-care testing (POCT). This technique enables portable nucleic acid detection devices for applications like pathogen identification.

Keywords:
customizable heaterheater patterningnichrome wirepathogen detection

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Area of Science:

  • Biomedical Engineering
  • Molecular Diagnostics
  • Materials Science

Background:

  • Accurate sample heating is crucial for nucleic acid extraction and amplification in molecular detection.
  • Traditional thermal cycling systems are bulky, expensive, and lab-bound, limiting their use in point-of-care settings.
  • There is a need for portable, cost-effective heating solutions for molecular diagnostics outside traditional laboratory environments.

Purpose of the Study:

  • To introduce a versatile and customizable heating technique for point-of-care molecular diagnostics.
  • To demonstrate the fabrication of tailored heaters using patterned nichrome wire on carbon black-polydimethylsiloxane (PDMS) casts.
  • To validate the applicability of these custom heaters for nucleic acid amplification techniques in portable devices.

Main Methods:

  • Developed a fabrication method for custom heaters by arranging protrusions on a PDMS cast and patterning nichrome (NiCr) wire.
  • Created a 2D heater with three temperature zones for a portable polymerase chain reaction (PCR) device.
  • Designed and tested a 3D heater for loop-mediated isothermal amplification (LAMP) in a microtube format.
  • Utilized cost-effective and shape-unconstrained materials for heater fabrication.

Main Results:

  • Successfully fabricated both 2D and 3D customized heaters with precise temperature control.
  • Demonstrated the utility of a 2D heater for portable thermocycling in detecting *Escherichia coli* (E. coli) O157:H7 DNA via PCR.
  • Showcased the effectiveness of a 3D heater for pathogen DNA detection using loop-mediated isothermal amplification (LAMP).

Conclusions:

  • The proposed nichrome wire patterning technique offers a cost-effective and versatile solution for creating custom heaters.
  • This heating method is suitable for point-of-care testing (POCT) applications, enabling portable molecular diagnostics.
  • The successful DNA amplification demonstrates the potential of this technique for rapid pathogen detection in diverse settings.