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Measurement of substrate thermal resistance using DNA denaturation temperature

Kinahan, David and Dalton, Tara and Davies, Mark (2009) Measurement of substrate thermal resistance using DNA denaturation temperature. International Journal of Thermal Sciences, 49 (2). pp. 333-339. ISSN 1290-0729

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Abstract

Heat Transfer and Thermal Management have become important aspects of the developing field of uTAS systems particularly in the application of the the uTAS philosophy to thermally driven analysis techniques such as PCR. Due to the development of flowing PCR thermocyclers in the field of uTAS, the authors have previously developed a melting curve analysis technique that is compatible with these flowing PCR thermocyclers. In this approach a linear temperature gradient is induced along a sample carrying microchannel. Any flow passing through the microchannel is subject to linear heating. Fluorescent monitoring of DNA in the flow results in the generation of DNA melting curve plots. This works presents an experimental technique where DNA melting curve analysis is used to measure the thermal resistance of microchannel substrates. DNA in solution is tested at a number of different ramp rates and the di®erent apparent denaturation temperatures measured are used to infer the thermal resistance of the microchannel substrates. The apparent variation in denaturation temperature is found to be linearly proportional to flow ramp rate. Providing knowledge of the microchannel diameter and a non-varying cross-section in the direction of heat flux the thermal resistance measurement technique is independent of knowledge of substrate dimensions, contact surface quality and substrate composition/material properties. In this approach to microchannel DNA melting curve analysis the difference between the measured and actual denaturation temperatures is proportional to the substrate thermal resistance and the ramp-rate seen by the sample. Therefore quantitative knowledge of the substrate thermal resistance is required when using this technique to measure accurately DNA denaturation temperature

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:PCR; Fluorescent melting curve analysis; DenaturationofDNA; Genetic analysis; Thermalresistance; Microchannel; Substrate
Subjects:Engineering > Biomedical engineering
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.ijthermalsci.2009.07.026
Copyright Information:© 2009 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:17159
Deposited On:15 Aug 2012 14:19 by David Kinahan. Last Modified 15 Aug 2012 14:19

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