Articles you may be interested inThe influence of laser-induced nanosecond rise-time stress waves on the microstructure and surface chemical activity of single crystal Cu nanopillars J. Appl. Phys. 113, 084309 (2013); 10.1063/1.4793646Cell adhesion measurement by laser-induced stress waves

The analysis of LiH and LiD nanosecond — created laser plasmas reveals correlations between the various parameters of each plasma event. Relationships are found involving the energy spectra of the ion species, the target reflectivity, neutron production, hard and soft x-ray emission, the electron temperature, and the input laser energy. Ion — expansion spectra of nonthermal origin are observed under the condition of high target reflectivity. High target reflectance is correlated to neutron and hard x-ray production as well as an apparent decrease in electron thermal content for laser energies of 18–70 J. The ion — expansion spectra are obtained with mass and charge separation by the parallel electric and magnetic fields of a Thomson parabola ion analyzer. A novel feature of this device is the conversion of the analyzed ion beam to a visible image via an electron multiplier array, providing complete information on a single — shot basis. The Nd+3 glass laser used in these experiments delivers up to 70 J to the target in 2.5 nsec (FWHM) pulses from a four-amplifier system. Isolation and protection of the smaller amplifiers from amplified target feedback is accomplished by insertion of a pulsed Faraday rotator between the second and third amplifiers.

Spatial and spectral studies of shock-induced luminescence from x-cut crystalline quartz as a function of stress level revealed the following information: Crystalline x-cut quartz has a threshold for emission near the dynamic yield point (about 6 GPa); the spatial distribution of the luminescence from x-cut quartz changes from an intersecting linear emission pattern to a uniform emission pattern as the stress level increases from 6 to 8 GPa; spectra from x-cut quartz are band-like rather than blackbody; crystalline x-cut quartz has emission peaks near 400 and 600 nm; a change in the 400-nm emission with time can be correlated to wave interaction times. A discussion of the luminous emission in terms of yielding and other physical mechanisms is given.

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. Can. J. Chem. 60,291 (1982). The first application of magnetic circular dichroism (rncd) spectroscopy to drug-dinucleotide binding is reported. The mcd spectra have been recorded for complexes of the intercalating anthracyclines carrninomycin, marcellomycin, and aclacinomycin with the dinucleotide CpG. Analysis indicates that drugs having OH groups peri to each anthraquinone carbonyl (i.e. carminomycin and marcellomycin) bind with only one drug molecule in the central hydrophilic region of the nucleotide. By contrast, aclacinomycin, in which one of the anthraquinone carbonyls lacks a peri-OH, is found to cooperatively bind, and has two drug molecules present in the dinucleotide cavity. The cooperativity of binding has been elucidated via an optical titration procedure. Chem. 60, 291 (1982). On rapporte la premiere application de la spectroscopie du dichroisme circulaire magnetique (dcm) a la liaison medicarnent-dinucleotide. On a enregistre les spectres de dcm des complexes formes par les intercalants anthracycline, carminomycine, marcellomycine et aclacinomycine, avec le dinucleotide CpG. Les analyses revelent que les medicaments qui ont des groupements OH enpPri par rapport ?+ chaque carbonyle de l'anthraquinone (comme la carminomycine et la marcellomycine) sont lies a une seule molecule de medicament dans la region hydrophile centrale du nucleotide. On trouve au contraire que I'aclacinomycine, dans laquelle il manque un groupement OH peri pour I'un des carbonyles de l'anthraquinone, est liee cooperativement et que deux moltcules de medicament sont presentes dans la cavite du dinucleotide. On a identifie la cooperativite du lien par I'intermedaire d'une methode de titration optique.[Traduit par ie journal]