Although social hymenopteran colonies show a high level of cooperation among their members, colony members can have conflicts among themselves as well. One of these intra-colonial conflicts is who produces the males. I ...

Self-interaction error appears because the exchange interaction of a system does not cancel the self-coulomb energy of its electron density, yet this exchange interaction contributes to the non-dynamical correlation ...

The stabilities and expression levels of over 150 randomly-generated triple mutants and 100 different rationally constructed single, double, and triple mutants of sperm whale myoglobin have been examined. The effects of ...

Advances in the computation of the Coulomb, exchange, and correlation contributions to Gaussian-based Hartree-Fock and density functional theory Hamiltonians have demonstrated near-linear scaling with molecular size for ...

The central star of the Helix Nebula, the closest planetary nebula, is ringed by hundreds of Cometary Knots. Presented here are images taken with WFPC2 of a field in the northern portion of the bright ring and some physical ...

The lanosterol synthases from Trypanosoma cruzi, Trypanosoma brucei and Pneumocystis carinii, the lanosterol 14-demethylases from Trypanosoma brucei and Trypanosoma cruzi, and the cytochrome P450 reductase from Trypanosoma ...

Absolute differential and integral charge transfer cross sections have been measured for 0.5, 0.85, 1.5, 2.8, and 5.0 keV O$\sp+$ with O$\sb2$ at scattering angles between 0.01$\sp\circ$ and 3.50$\sp\circ$ in the laboratory ...

Review and analysis of atomic collision data (such as collision cross sections and ion-neutral reaction rates) used in the upper atmospheric modeling for Earth and other planets are presented. This work gives the first ...

For decades, social amoebae have served as a model supporting broader theories of social behavior. Owing to their peculiar aggregative life cycle, it has seemed reasonable altruism in social amoebae is possible because ...

I examined sequences of 3 microsatellite loci that were derived from Polistes bellicosus investigated their evolution in 78 species from four tribes in the Polistinae subfamily of wasps. I found that the basic repeat ...