National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Magnetic Properties of the DNA-Quaternary Ammonium Surfactant Complexes Studied by EMR Spectroscopy and SQUID Measurement.

ADA487055

Publication Date	2008
Personal Author	Kwon, Y.; Do, E. D.; Choi, D. H.; Jin, J.; Lee, C. H.
Page Count	20
Abstract	Due to their unique chemical structures and versatile functionalities associated with their structural characteristics many research groups are studying the materials science aspects of natural and synthetic DNA. In particular, interest in nanoscience and nanotechnology is accelerating the exploration of DNA for various properties such as electrical conductivity electron or hole transport and optical properties. In contrast, study on the magnetic properties of DNA is still in the infant stage. Recently, we reported for the first time that natural dsDNA in dry state (A-DNA) showed an extremely broad electron magnetic resonance (EMR) signal as well as an S-shaped magnetization-magnetic field (M-H) curve in SQUID measurements. The broad EMR signal was interpreted as a cyclotron resonance (CR), which is possible only when the double helical structure of each dsDNA coherently couples throughout the elementary fibrils resulting in the formation of lateral loop currents responsible for the S-shaped M-H curves in SQUID measurements. Both the EMR signals and the S-shaped magnetizations are found to be strongly correlated to each other. Assuming that the fibrillar dsDNA are in a morphologically heterogeneous structure, formation of such loop currents by the external field must be much more favored in ordered regions than in amorphous ones. In other word, the dsDNA can not only be a molecular solenoid in the single molecular level, but also can be a ferromagnetic in the well ordered regions due to coherently coupled bundles of DNA molecular solenoids. Therefore, if one introduces a magnetic dipole into the DNA molecular solenoid, a strong enhancement of DNA susceptibility is expected to occur as in an electrical solenoid with a magnetic bar. In this respect, we tried to insert various stable radicals into the dsDNA and succeeded in observing strong enhancements in their magnetic susceptibilities.
Keywords	Electromagnetic properties Solenoids Deoxyribonucleic acids Nanotechnology Molecular dynamics Molecular structure South korea Emr(Electron magnetic resonance) Loop currents Dna molecular solenoids Foreign reports
Source Agency	Non Paid ADAS
NTIS Subject Category	46 - Physics 57B - Biochemistry 57F - Cytology, Genetics, & Molecular Biology
Corporate Authors	Korea Univ., Seoul (Republic of Korea).
Supplemental Notes	Produced in collaboration with the Department of Polymer Science & Engineering, Chosun University, Gwangju, Korea and the Materials and Manufacturing Directorate, US Air Force Research Laboratory, Wright-Patterson Air Force Base, OH. To be included in the monograph 'Biotronics,' edited by Dr. James Grote, for publication by SPIE Press in 2009. The original document contains color images. All D.
Document Type	Technical Report
Title Note	Book chapter.
NTIS Issue Number	200902
Contract Number	FA4869-07-1-4023

Magnetic Properties of the DNA-Quaternary Ammonium Surfactant Complexes Studied by EMR Spectroscopy and SQUID Measurement.

Magnetic Properties of the DNA-Quaternary Ammonium Surfactant Complexes Studied by EMR Spectroscopy and SQUID Measurement.
ADA487055

Publication Date	2008
Personal Author	Kwon, Y.; Do, E. D.; Choi, D. H.; Jin, J.; Lee, C. H.
Page Count	20
Abstract	Due to their unique chemical structures and versatile functionalities associated with their structural characteristics many research groups are studying the materials science aspects of natural and synthetic DNA. In particular, interest in nanoscience and nanotechnology is accelerating the exploration of DNA for various properties such as electrical conductivity electron or hole transport and optical properties. In contrast, study on the magnetic properties of DNA is still in the infant stage. Recently, we reported for the first time that natural dsDNA in dry state (A-DNA) showed an extremely broad electron magnetic resonance (EMR) signal as well as an S-shaped magnetization-magnetic field (M-H) curve in SQUID measurements. The broad EMR signal was interpreted as a cyclotron resonance (CR), which is possible only when the double helical structure of each dsDNA coherently couples throughout the elementary fibrils resulting in the formation of lateral loop currents responsible for the S-shaped M-H curves in SQUID measurements. Both the EMR signals and the S-shaped magnetizations are found to be strongly correlated to each other. Assuming that the fibrillar dsDNA are in a morphologically heterogeneous structure, formation of such loop currents by the external field must be much more favored in ordered regions than in amorphous ones. In other word, the dsDNA can not only be a molecular solenoid in the single molecular level, but also can be a ferromagnetic in the well ordered regions due to coherently coupled bundles of DNA molecular solenoids. Therefore, if one introduces a magnetic dipole into the DNA molecular solenoid, a strong enhancement of DNA susceptibility is expected to occur as in an electrical solenoid with a magnetic bar. In this respect, we tried to insert various stable radicals into the dsDNA and succeeded in observing strong enhancements in their magnetic susceptibilities.
Keywords	Electromagnetic properties Solenoids Deoxyribonucleic acids Nanotechnology Molecular dynamics Molecular structure South korea Emr(Electron magnetic resonance) Loop currents Dna molecular solenoids Foreign reports
Source Agency	Non Paid ADAS
NTIS Subject Category	46 - Physics 57B - Biochemistry 57F - Cytology, Genetics, & Molecular Biology
Corporate Authors	Korea Univ., Seoul (Republic of Korea).
Supplemental Notes	Produced in collaboration with the Department of Polymer Science & Engineering, Chosun University, Gwangju, Korea and the Materials and Manufacturing Directorate, US Air Force Research Laboratory, Wright-Patterson Air Force Base, OH. To be included in the monograph 'Biotronics,' edited by Dr. James Grote, for publication by SPIE Press in 2009. The original document contains color images. All D.
Document Type	Technical Report
Title Note	Book chapter.
NTIS Issue Number	200902
Contract Number	FA4869-07-1-4023