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Resonance Scattering (resonance + scattering)

Distribution by Scientific Domains

Chemistry	60%
Physics and Astronomy	40%

Selected Abstracts

Time asymmetric quantum theory , I. Modifying an axiom of quantum physics

FORTSCHRITTE DER PHYSIK/PROGRESS OF PHYSICS, Issue 6 2003
A.R. Bohm
A slight modification of one axiom of quantum theory changes a reversible theory into a time asymmetric theory. Whereas the standard Hilbert space axiom does not distinguish mathematically between the space of states (in-states of scattering theory) and the space of observables (out-"states" of scattering theory) the new axiom associates states and observables to two different Hardy subspaces which are dense in the same Hilbert space and analytic in the lower and upper complex energy plane, respectively. As a consequence of this new axiom the dynamical equations (Schrödinger or Heisenberg) integrate to a semigroup evolution. Extending this new Hardy space axiom to a relativistic theory provides a relativistic theory of resonance scattering and decay with Born probablilities that fulfill Einstein causality and the exponential decay law. [source]

Determination of nucleic acid by [tetra-(3-methoxy-4-hydroxyphenyl)],Tb3+ porphyrin as the fluorescence spectral probe in bis(2-ethylhexyl)sulfosuccinate sodium salt micelle system

LUMINESCENCE: THE JOURNAL OF BIOLOGICAL AND CHEMICAL LUMINESCENCE, Issue 4 2009
Xin Chen
Abstract A new system for the determination of nucleic acid by rare earth metallic porphyrin of [tetra-(3-methoxy-4-hydroxyphenyl)],Tb3+ [T(3-MO-4HP),Tb3+] porphyrin as fluorescence spectral probe has been developed in this paper. Nucleic acid can enhance the fluorescence intensity of the T(3-MO-4HP),Tb3+ porphyrin in the presence of bis(2-ethylhexyl)sulfosuccinate sodium salt(AOT) micelle. In pH 8.00 Tris,HCl buffer solution, under optimum conditions, the enhanced fluorescence intensity is in proportion to the concentration of nucleic acids in the range of 0.05,3.00 µg mL,1 for calf thymus DNA (ct DNA) and 0.03,4.80 µg mL,1 for fish sperm DNA(fs DNA). Their detection limits are 0.03 and 0.01 µg mL,1, respectively. In addition, the binding interaction mechanism between T(3-MO-4HP),Tb3+ porphyrin and ct DNA is also investigated by resonance scattering and fluorescence spectra. The maximum binding number is calculated by molar ratio method. The new system can be used for the determination of nucleic acid in pig liver, yielding satisfactory results. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Catalytic resonance scattering spectral determination of ultratrace horseradish peroxidase using rhodamine S

LUMINESCENCE: THE JOURNAL OF BIOLOGICAL AND CHEMICAL LUMINESCENCE, Issue 3 2009
Zhiliang Jiang
Abstract A highly sensitive and selective resonance scattering spectral assay was proposed for the determination of horseradish peroxidase (HRP), based on its catalytic effect on the H2O2 oxidation of KI to form I3,. The I3, combined respectively with rhodamine (Rh) dye such as rhodamine S (RhS), rhodamine 6G (Rh6G), rhodamine B (RhB) and butyl-rhodamine B (b-RhB), to form association particles (Rh-I3)n. The four Rh systems all exhibit a stronger resonance scattering (RS) peak at 424 nm. For the RhS, Rh6G, RhB and b-RhB systems, HRP concentration in the range of 3.2 × 10,12 to 4.8 × 10,9, 2 × 10,11 to 3.2 × 10,9, 1.6 × 10,11 to 3.2 × 10,9 and 1.6 × 10,11 to 4 × 10,9 g/mL was linear to its RS intensity at 424 nm, with a detection limit of 2.2 × 10,12, 2.5 × 10,12, 4.4 × 10,12 and 2.6 × 10,12 g/mL, respectively. This RhS system was most sensitive and stable, and was applied for the determination of HRP in the hepatitis B surface antibody labeling HRP and water samples, with satisfactory results. Copyright © 2009 John Wiley & Sons, Ltd. [source]

X-ray beaming caused by resonance scattering in the accretion column of magnetic cataclysmic variables

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 1 2001
Y. Terada
Extremely strong ionized Fe emission lines, with equivalent widths reaching ,4000 eV, were discovered by ASCA from a few Galactic compact objects, including AX J2315,0592, RX J1802.1+1804 and AX J1842.8,0423. These objects are thought to be binary systems containing magnetized white dwarfs (WDs). A possible interpretation of the strong Fe K line is the line-photon collimation in the WD accretion column, as a result of resonance scattering of line photons. The collimation occurs when the accretion column has a flat shape, and the effect is augmented by the vertical velocity gradient, which reduces the resonant trapping of resonant photons along the magnetic field lines. This effect was quantitatively confirmed with Monte Carlo simulations. Furthermore, with ASCA observations of the polar V834 Centauri, this collimation effect was clearly detected as a rotational modulation of the equivalent width of the Fe K emission line. The extremely strong emission lines mentioned above can be explained consistently by our interpretation. Combining this effect with other X-ray information, the geometry and plasma parameters in the accretion column were determined. [source]

Resonance Scattering Spectral Determination of Trace Penicillin G Using Immunonanogold-HAuCl4 -NH2OH Catalytic Reaction

CHINESE JOURNAL OF CHEMISTRY, Issue 7 2009
Guiqing WEN
Abstract Both nanogold and immunonanogold exhibit catalytic effect on the slow reaction of HAuCl4 -NH2OH to form gold particles which displayed a resonance scattering (RS) peak at 580 nm. Using hapten penicillin G (PG) as a model, the nanogold in size of 9 nm was used to label rabbit anti-penicillin G antisera (RAPG) to obtain an immunonanogold probe (AuRAPG) for PG. The PG was combined with AuRAPG to form the immunocomplex and bigger nanogold clusters. After centrifugation, the excess AuRAPG in the supernatant exhibited catalytic effect on the reaction of HAuCl4 -NH2OH, and the RS intensity at 580 nm (I580 nm) was enhanced greatly. With the addition of PG, the I580 nm decreased accordingly. Under the optimal conditions, the decreased intensity ,I580 nm was proportional to the PG concentration in the range of 0.15,225 ng/mL, with a detection limit of 0.05 ng/mL for PG. [source]