Troubleshooting DNA Gel Analysis: Standard Curve and Smallest Band Size Queries

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SUMMARY

The discussion centers on troubleshooting DNA gel analysis, specifically regarding the standard curve and the representation of small band sizes. The user utilized lambda HindIII as a marker but encountered a non-linear standard curve when plotting DNA size against distance from the well on semi-log paper. Additionally, the user faced difficulty representing a 0.5 band size on the graph, as the smallest digit on the semi-log graph is 1. The consensus is that while a straight line is ideal, a linear curve can still provide useful data, and the 0.5 band should not be ignored but rather approximated or interpolated.

PREREQUISITES
  • Understanding of DNA gel electrophoresis techniques
  • Familiarity with semi-logarithmic graphing
  • Knowledge of lambda HindIII as a DNA marker
  • Basic principles of logarithmic relationships in molecular biology
NEXT STEPS
  • Research methods for interpolating data points on semi-log graphs
  • Learn about the significance of standard curves in gel electrophoresis
  • Explore troubleshooting techniques for non-linear standard curves
  • Study the implications of band size representation in DNA analysis
USEFUL FOR

This discussion is beneficial for molecular biologists, laboratory technicians, and students involved in DNA analysis and gel electrophoresis who seek to understand the nuances of graphing and interpreting gel results.

biochemist
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Hi everyone, I ran a gel for restriction digestion and used lamda HindIII as the marker. When I'm drawing the graph on a semi-log paper, size on y-axis and distance from the well on the x axis, the standard curve isn't a straight line, but a linear curve. Is it fine?

Another question: the smallest digit given on a semi-log graph paper for DNA size is 1, but I've got a 0.5 band and couldn't point it out on the graph. What shall I do? Shall I just ignore this?

Very much appreciated if you could help me solve my problems
 
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I'm really confused, cos I've learned that the distance from the well measured should be proportional to the log10 value of the DNA size. And by theory I should have got a straight line or nearly straight, but the curve I've got doesn't seem to be straight at all!
 
Anyone can answer my question?
 

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