In this article, effective point spread functions for fluorescence microscopic imaging are introduced to investigate the effects of scattering particle size and optical gating on image resolution under single-photon (1p) and two-photon (2p) excitation. The dependence of image resolution on these effects shows a deeper penetration depth under 2p excitation due to the use of a longer illumination...

A time-dependent close-coupling method is used to calculate the electron-impact ionization cross section for the outer 2p subshell of both carbon and neon atoms. The inner 1s and 2s subshells are treated using pseudopotentials, while interaction with the remaining 2p core electrons is handled in a configuration-average approximation. When the time-dependent ionization cross section for the 2p s...

We have studied the wavelength-dependent photodissociation dynamics of jet-cooled ClO radical from 235 to 291 nm using velocity map ion imaging. We find that Cl(2P(3/2))+O(1D(2)) is the dominant channel above the O(1D(2)) threshold with minor contributions from the Cl(2P(J))+O(3P(J)) and Cl(2P(1/2))+O(1D(2)) channels. We have measured the photofragment angular distributions for each dissociatio...

Aims. 2P/Encke is a short period comet that was discovered in 1786 and has been extensively observed and studied for more than 200 years. The Taurid meteoroid stream has long been linked with 2P/Encke owing to a good match of their orbital elements, even though the comet’s activity is not strong enough to explain the number of observed meteors. Various small near-Earth objects (NEOs) have been ...

A general method is developed for the construction of idempotent generators of GR-codes over GF(q) of length n. For n ∈ {p, 2p, p, 2p}, explicit expressions for these generators can be derived.

A minor class of introns with noncanonical splice (AT-AC) and branch site sequences exists in metazoan protein coding genes. We have established a HeLa cell in vitro system that accurately splices a pre-mRNA substrate containing such an intron from the human P120 gene. Splicing occurs via a lariat intermediate whose branch site A residue is predicted to bulge from a duplex formed with the low a...

At the low electron temperatures existing in photoionized gases with cosmic abundances, dielectronic recombination (DR) proceeds primarily via excitations of core electrons ( DR). At these temperatures, ′ nl r nl Dn 5 0 ′ j j the dominant DR channel often involves fine-structure core excitations, which are not included in 2p r 2p 1/2 3/2 LS-coupling calculations or the Burgess formula. Using th...