Sum Frequency Generation
Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. Detection of chiral sum frequency generation vibrational spectra of proteins and peptides at interfaces in situ
In this work, we demonstrate the feasibility to collect off-electronic resonance chiral sum frequency generation (SFG) vibrational spectra from interfacial proteins and peptides at the solid/liquid interface in situ. It is difficult to directly detect a chiral SFG vibrational spectrum from interfacial fibrinogen molecules. By adopting an interference enhance
National Academy of Sciences.
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14. A few selected applications of surface nonlinear optical spectroscopy.
As a second-order nonlinear optical process, sum-frequency generation is highly surface-specific and accordingly has been developed into a very powerful and versatile surface spectroscopic tool. It has found many unique applications in different disciplines and thus provided many exciting new research opportunities in surface and surface-related science. Sel
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15. Nonlinear analysis of cat retinal ganglion cells in the frequency domain.
We have analyzed the responses of cat retinal ganglion cells to luminosity gratings that are modulated in time by a sum of sinusoids. A judicious choice of the component temporal frequencies permits a separation of the linear and second-order nonlinear components. Y cell responses show harmonic generation and intermodulation distortion over a wide frequency
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16. Maintenance of Genetic Variability under the Pressure of Neutral and Deleterious Mutations in a Finite Population
In order to assess the effect of deleterious mutations on various measures of genic variation, approximate formulas have been developed for the frequency spectrum, the mean number of alleles in a sample, and the mean homozygosity; in some particular cases, exact formulas have been obtained. The assumptions made are that two classes of mutations exist, neutra
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17. Mutation Rate and Dominance of Genes Affecting Viability in DROSOPHILA MELANOGASTER
Spontaneous mutations were allowed to accumulate in a second chromosome that was transmitted only through heterozygous males for 40 generations. At 10-generation intervals the chromosomes were assayed for homozygous effects of the accumulated mutants. From the regression of homozygous viability on the number of generations of mutant accumulation and from the
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18. Genetic and Statistical Analyses of Strong Selection on Polygenic Traits: What, Me Normal?
We develop a general population genetic framework for analyzing selection on many loci, and apply it to strong truncation and disruptive selection on an additive polygenic trait. We first present statistical methods for analyzing the infinitesimal model, in which offspring breeding values are normally distributed around the mean of the parents, with fixed va