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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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Related Experiment Video

Updated: Feb 2, 2026

A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons
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On-site Method for Beef Detection Based on Strand Exchange Amplification.

Xuejiao Wang1, Chunyu Yan1, Manman Wei1

  • 1Shandong Provincial Key Laboratory of Biochemical Engineering, College of Chemistry and Molecular Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|November 20, 2018
PubMed
Summary
This summary is machine-generated.

A new colorimetric method accurately identifies beef using strand exchange amplification (SEA). This rapid, sensitive assay detects as little as 1% beef in 50 minutes, suitable for on-site meat screening.

Keywords:
Strand exchange amplificationbeef detectioncolorimetric methodmeat detectionon-site detection

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Area of Science:

  • Food Science
  • Biotechnology
  • Analytical Chemistry

Background:

  • Meat screening is crucial for public health and religious practices.
  • Accurate identification methods for specific meats, like beef, are limited.
  • Existing beef identification techniques often lack speed and on-site applicability.

Purpose of the Study:

  • To develop a rapid, sensitive, and specific colorimetric method for beef identification.
  • To establish an on-site applicable assay for detecting beef in mixed meat samples.
  • To evaluate the feasibility of using crude meat extracts for beef detection.

Main Methods:

  • Development of a colorimetric assay based on denaturation bubble-mediated strand exchange amplification (SEA).
  • Utilization of a portable metal bath for sample processing.
  • Visual detection of color changes for positive and negative results.
  • Testing with crude duck meat samples spiked with varying percentages of beef.

Main Results:

  • The developed method successfully identified beef with high sensitivity and specificity.
  • Detection limit was as low as 1% (w/w) beef in duck meat.
  • The entire process, including crude sample preparation, was completed within 50 minutes.
  • The assay demonstrated good repeatability and visual color differentiation.

Conclusions:

  • The developed colorimetric SEA method provides a rapid, sensitive, and specific means for beef identification.
  • The assay is suitable for on-site applications due to its simplicity and visual readout.
  • This method offers a promising strategy for effective meat screening and authentication.