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Quasi-2D e- Systems and
Bio-Magnetic Manipulation
Valles
Lab, Brown Physics |
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Nano-structured,
quasi-2D metals, superconductors and insulators (overview) Ultrathin SN bilayers Nano-perforated ultrathin films Magnetic field manipulation of
biological systems: Swimming paramecium - Inverted gravity, hypo-gravity and hyper
gravity simulation and
magneto-orientation (Karine’s overview, press release, NMMFL, movies, APS Press , Magnetics
Online, Scientific American) Cell division in frog eggs (overview) Microtubule solution patterns (overview, press: Brown release, upi, Scientist Live, Medical Physics Web) Magnetic levitation (see movies) |
Low temperature STM image of a Pb film |
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Levitated frog embryos |
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Polscope image of paramecium |
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Magnetically reoriented cell divisions |
Mitotic apparatus |
Pb nanocrystal arrays |
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Quasi-2D Metals, Superconductors, and Insulators "Superconducting pair correlations in an amorphous insulating nanohoneycomb film", M. D. Stewart, Jr., Aijun Yin, J. M. Xu, and James M. Valles, Jr., SCIENCE 318, 1273-1275 (2007) pdf _ “ Magnetic-field-tuned superconductor-to-insulator transitions in amorphous Bi films with nanoscale hexagonal arrays of holes” M. D. Stewart, Jr., Aijun Yin, J. M. Xu, and James M. Valles, Jr., Physical Review B77, 140501(R) (2008) . pdf _ “Super Weakly Coupled
Superconductivity in Ultrathin Superconductor-Normal Metal Bilayers” (Zhenyi Long, M. D. Stewart, Jr., and James
M. Valles, Jr.) Physical Review B 73, 140507(R) (2006). pdf
,cond-mat “Magnetic Flux
Periodic Response of Nano-perforated Films Near the Superconductor to
Insulator Transition” (M. D. Stewart, Jr., “Negative magnetoresistance, negative
electroresistance, and metallic behavior on the insulating side of the two
dimensional superconductor-insulator transition” (R. P. Barber, Jr., Shih-Ying Hsu, James M.
Valles, Jr., R. C. Dynes and R. E. Glover III) Physical Review B 73,
134516 (2006) PDF. “Early Stage Morphology of Quench
Condensed Pb, Ag and Pb/Ag Hybrid Films” (Zhenyi Long and James M. Valles, Jr.)
Journal of Low Temperature Physics 139,
429-438 (2005) [pdf]
. “Ordered Nano-Crystal Arrays
Spontaneously Form in Films Evaporated onto Nanopore Array Substrates” (Niravun Pavenayotin, M. D. Stewart, Jr.,
James M. Valles, Jr., Aijun Yin, and J. M. Xu) Applied Physics Letters 87, 193111 (2005) PDF. “Subgap Density of States in
Superconductor-Normal Metal Bilayers in the Cooper Limit” (Zhenyi Long, M. D. Stewart, Jr., “Deviations from mean-field behavior
in disordered nanoscale superconductor-normal-metal-superconductor
arrays” ( "Fluctuation
Effects in High Sheet Resistance Superconducting Films," (J. M. Valles, Jr., J. A. Chervenak, S. -Y.
Hsu, and T. J. Kouh) Uspekhi Fizicheskikh Nauk 171, 104 (2001)[pdf]. “Absence of Vortex Solid Phase in
Strongly Disordered Superconducting Bi Films” (J. A. Chervenak and J. M. Valles, Jr.)
Phys. Rev. B 61, R9245 (2000) PDF. “Critical Amplitude Fluctuations in
Low Superfluid Density Two Dimensional Superconductors” (J. A. Chervenak and J. M. Valles, Jr.)
Phys. Rev. B 59, 11209 (1999) PDF. “Morphology of Quench Condensed Pb
Films near the Insulator to Metal Transition” (K. L. Ekinci and J. M. Valles, Jr.) Phys. Rev. Lett. 82, 1518 (1999) PDF. “Magnetic Field Enhanced Order
Parameter Amplitude Fluctuations in Ultrathin Films Near the
Superconductor-Insulator Transition” (S.-Y. Hsu,
J.A. Chervenak and J.M. Valles, Jr.)
Phys. Rev. Lett. 75, 132 (1995) PDF. Magnetic Field Manipulation of Biological Systems "Polymerization Force Driven Buckling of Microtubule Bundles Determines the Wavelength of Patterns Formed in Tubulin Solutions", (Yongxing Guo, Yifeng Liu, Jay X. Tang, and James M. Valles, Jr.)
Phys. Rev. Lett. 98, 198103 (2007) PDF. “Swimming Paramecium in magnetically
simulated enhanced, reduced, and inverted gravity environments”, (Karine
Guevorkian and (Yifeng Liu, Yongxing Guo, “Aligning Paramecium Caudatum with
Static Magnetic Fields” (Karine Guevorkian and James M. Valles, Jr.)
Biophysical Journal 90, 3004-3011
(2006) [PDF]. “In situ
imaging of microorganisms in intense magnetic fields” (Karine Guevorkian and James M. Valles, Jr.)
Review of Scientific Instruments 76,
103706 (2005) PDF. “Manipulating Cells with Static
Magnetic Fields” (J. M. Valles, Jr. and K. Guevorkian) in Materials Processing in Magnetic Fields,
Proceedings of the International Workshop on Materials Analysis and
Processing in Magnetic Fields, edited by H. J. Schneider-Muntau and H. Wada
(World Scientific, New Jersey, 2005) pp. 257-265. “Magnetic Levitation Based Martian and
Lunar Gravity Simulator” (J.M. Valles, Jr., H.J. Maris, G.M.
Seidel, J. Tang, and “Varying the Effective Buoyancy of
Cells using Magnetic Force” (Karine Guevorkian and James M. Valles, Jr.) Applied Physics Letters 84, 4863-4865
(2004) PDF.
“Model of Magnetic Field Induced
Mitotic Apparatus Reorientation in Frog Eggs” (J. M. Valles, Jr.) Biophys. J. 82,
1260-1265 (2002) [PDF]. “Processes that Occur Before 2nd
Cleavage Determine 3rd Cleavage Orientation in Xenopus” (J. M. Valles, Jr., S.R.R.M. Wasserman, C.
Schweidenback, J. Edwardson, J. M. Denegre, and K. L. Mowry) Expt. Cell Res. 274,
112-118 (2002). “Low
Gravity on Earth by Magnetic Levitation of Biological Material” (Karine Guevorkian and James M. Valles, Jr.)
Journal of Gravitational Physiology 9, 11-14 (2002). “Cleavage Planes in Frog Eggs Altered
by Strong Magnetic Fields” (J. M. Denegre, J.M. Valles, Jr., K. Lin, W.
B. Jordan, and K. L. Mowry) Proc.
Natl. Acad. Sci. USA 95, 14729
(1998).[PDF] |
