Radha Ranganathan/Physics and Astronomy

Radha Ranganathan, Professor
Department of Physics and the Center for Supramolecular Studies

Office: Science Builing II, room 2003
Phone: 2942
e-mail: radha.ranganathan@csun.edu

Office hours: (Fall 2002 semester only) Monday 4-7 P.M.

Research interests: Combine Time Resolved Fluorescence Quenching (TRFQ) and Electron Spin Resonance (ESR) to determine the physico-chemical and biophysical properties of molecules of biological interest with the goal of understanding their basic function. Through collaborations with scientists at other institutions both within and outside the U.S., other experimental techniques including Small Angle Neutron Scattering and Nuclear Magnetic Resonance are also employed.

Our laboratories are equipped with a nanosecond flashlamp pumped lifetime spectrometer (Edinburgh Instruments, FL900); two Bruker ESP 300 E ESR spectrometers, a Krüss K12 tensiometer for Surface Tension, a Wayne-Kerr Precision Component Analyzer, Model 6430 A for measuring desired electrical properties with high precision and facilities for sample preparation.

Presently working on mixed micelles, electrostatic interactions between charged molecular surfaces, degradation of phospholipids by Phospholipases.

Undergraduate and Graduate Research projects are available. Please enquire via email or call 818 677 2942.

1) Radha Ranganathan, M. Peric, R. Medina, U. Garcia, and B. L. Bales, "Size, Hydration, and Shape of SDS/Heptane Micelles Investigated by Time Resolved Florescence Quenching and Electron Spin Resonance, Langmuir, 17, 6765-6770, (2001)

2) Barney L Bales, Radha Ranganathan, and P. C. Griffiths, Characterization of Mixed Micelles of SDS and a Sugar-Based Nonionic Surfactant as a Variable Reaction Medium; J. Phys. Chem. B, 105(31), 7465-7473 (2001)

3) Radha Ranganathan, Linh Tran, and Barney L Bales, Salt Induced Growth of Normal SodiumAlkyl Sulphate Micelles Well above their Critical Micelle Concentrations; The Journal of Physical Chemistry B; 104 (10); 2260-2264, (2000)

4) Radha Ranganathan, Laura T. Okano, Chang Yihwa, and Frank H Quina, Growth of Cetyltrimethylammonium Chloride and Acetate Micelles with Counterion concentration, Journal of Colloid and Interface Science, 214, 238-242, (1999).

5) Radha Ranganathan, Chang Yihwa, Elena O. Alonso and Frank H Quina, Salt Effects on the Dynamics of Incorporation of Organic Coions into Micelles; Journal of Physical Chemistry B, 103, J. Phys. Chem. B (1999).

6) Radha Ranganathan, Miroslav Peric, and Barney L Bales, Time Resolved Fluorescence Quenching Measurements of the Aggregation Numbers of Normal Sodium Alkyl Sulfate Micelles Well above the Critical Micelle Concentrations; Journal of Physical Chemistry B, 102, 8436 (1998).

7) Radha Ranganathan "A direct test of an aggregation number based definition of micelle ionization"; 14th International Symposium on Surfactants in Solutions, Barcelona, June 9-14, 2002

8) Radha Ranganathan, M. Peric, U. Garcia, R. Medina; Spin-Probe and Fluorescence Quenching Studies of SDS Micelles with Hydrocarbon Additives; Symposium on Lipid and Surfactant Self-Assemblies: Structure, Dynamics and Reactions, Uppsala, Sweden, February 2000



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	Radha Ranganathan, Professor Department of Physics and the Center for Supramolecular Studies Office: Science Builing II, room 2003 Phone: 2942 e-mail: radha.ranganathan@csun.edu Office hours: (Fall 2002 semester only) Monday 4-7 P.M. Research interests: Combine Time Resolved Fluorescence Quenching (TRFQ) and Electron Spin Resonance (ESR) to determine the physico-chemical and biophysical properties of molecules of biological interest with the goal of understanding their basic function. Through collaborations with scientists at other institutions both within and outside the U.S., other experimental techniques including Small Angle Neutron Scattering and Nuclear Magnetic Resonance are also employed. Our laboratories are equipped with a nanosecond flashlamp pumped lifetime spectrometer (Edinburgh Instruments, FL900); two Bruker ESP 300 E ESR spectrometers, a Krüss K12 tensiometer for Surface Tension, a Wayne-Kerr Precision Component Analyzer, Model 6430 A for measuring desired electrical properties with high precision and facilities for sample preparation. Presently working on mixed micelles, electrostatic interactions between charged molecular surfaces, degradation of phospholipids by Phospholipases. Undergraduate and Graduate Research projects are available. Please enquire via email or call 818 677 2942. Recent Publications and Conference presentations (1998 to present) 1) Radha Ranganathan, M. Peric, R. Medina, U. Garcia, and B. L. Bales, "Size, Hydration, and Shape of SDS/Heptane Micelles Investigated by Time Resolved Florescence Quenching and Electron Spin Resonance, Langmuir, 17, 6765-6770, (2001) 2) Barney L Bales, Radha Ranganathan, and P. C. Griffiths, Characterization of Mixed Micelles of SDS and a Sugar-Based Nonionic Surfactant as a Variable Reaction Medium; J. Phys. Chem. B, 105(31), 7465-7473 (2001) 3) Radha Ranganathan, Linh Tran, and Barney L Bales, Salt Induced Growth of Normal SodiumAlkyl Sulphate Micelles Well above their Critical Micelle Concentrations; The Journal of Physical Chemistry B; 104 (10); 2260-2264, (2000) 4) Radha Ranganathan, Laura T. Okano, Chang Yihwa, and Frank H Quina, Growth of Cetyltrimethylammonium Chloride and Acetate Micelles with Counterion concentration, Journal of Colloid and Interface Science, 214, 238-242, (1999). 5) Radha Ranganathan, Chang Yihwa, Elena O. Alonso and Frank H Quina, Salt Effects on the Dynamics of Incorporation of Organic Coions into Micelles; Journal of Physical Chemistry B, 103, J. Phys. Chem. B (1999). 6) Radha Ranganathan, Miroslav Peric, and Barney L Bales, Time Resolved Fluorescence Quenching Measurements of the Aggregation Numbers of Normal Sodium Alkyl Sulfate Micelles Well above the Critical Micelle Concentrations; Journal of Physical Chemistry B, 102, 8436 (1998). 7) Radha Ranganathan "A direct test of an aggregation number based definition of micelle ionization"; 14th International Symposium on Surfactants in Solutions, Barcelona, June 9-14, 2002 8) Radha Ranganathan, M. Peric, U. Garcia, R. Medina; Spin-Probe and Fluorescence Quenching Studies of SDS Micelles with Hydrocarbon Additives; Symposium on Lipid and Surfactant Self-Assemblies: Structure, Dynamics and Reactions, Uppsala, Sweden, February 2000