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Discriminating exo-atmosphere micro-motion targets is a key technology for precise guidance systems, infrared surveillance systems, and satellite remote sensing systems. Commonly, static IR images are insufficient to discriminate different targets in the field of view. The infrared signature, i.e., the time sequence of the target point's gray level in the(More)
As an important passive sensing technology, infrared sensor has been used in satellite remote sensing systems to discriminate exo-atmosphere targets. At a long range, even relatively large objects are represented as single pixels on the IR image. The infrared signature, i.e., the time sequence of the target point's gray level serves as potential(More)
We have synthesized a spin-label analog of phenylalanine as a competitive inhibitor probe of the sickle hemoglobin aggregation process. Sickle hemoglobin gelation measurements indicate that the spin-label phenylalanine analog is a potent inhibitor of deoxy sickle hemoglobin aggregation. We have also used spin label EPR and high-resolution proton NMR to(More)
The nonperturbative response of molecules in ultrashort (t < 20 femtoseconds), intense (I 10 W/cm ) laser fields can only be described by accurate numerical solutions of the corresponding time-dependent Schrödinger equation (non-relativistic) or Dirac (relativistic) equations. Different time scales, attosecond (10 s) for electrons, femtosecond (10 s) for(More)
We have measured the diffusional water permeability of sickle cell anemia red blood cells under isotonic conditions using pulsed nuclear magnetic resonance (NMR) techniques. We have found that the equilibrium diffusional permeability for sickle cells is about 1.61.10(-3) cm/s, or about 60% of the value measured for normal cells. This abnormality is not(More)
Human erythrocyte spectrin molecules exhibit relatively sharp (30-50 Hz) proton NMR signals in the aliphatic region. A standard solvent presaturation pulse sequence that also partially suppresses the broad envelope from protons with rigid structures in spectrin and selectively enhances the sharp resonances has been used to characterize the behavior of these(More)
Previous high resolution proton NMR data on human erythrocyte spectrin molecules has indicated the existence of regions exhibiting rapid internal motions within the intact molecules [L. W.-M. Fung, H.-Z. Lu, R. P. Hjelm, jr, M. E. Johnson, FEBS Lett., 197, 234 (1986)]. We have extended the studies by developing quantitative NMR methods to determine the(More)
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