Nearest-neighbor detection of atoms in a 1D optical lattice by fluorescence imaging

We overcome the diffraction limit in fluorescence imaging of neutral atoms in a sparsely filled one-dimensional optical lattice. At a periodicity of 433 nm, we reliably infer the separation of two atoms down to nearest neighbors. We observe light induced losses of atoms occupying the same lattice site, while for atoms in adjacent lattice sites, no losses due to light induced interactions occur. Our method points towards characterization of correlated quantum states in optical lattice systems with filling factors of up to one atom per lattice site.

Inserting two atoms into a single optical micropotential

We recently demonstrated that strings of trapped atoms inside a standing wave optical dipole trap can be rearranged using optical tweezers [Y. Miroshnychenko, Nature 442, 151 (2006)]. This technique allows us to actively set the interatomic separations on the scale of the individual trapping potential wells. Here, we use such a distance-control operation to insert two atoms into the same potential well. The detected success rate of this manipulation is 16(-3)(+4)%, in agreement with the predictions of a theoretical model based on our experimental parameters.

Age dependent kinetic studies of cytoplasmic and lysosomal enzymes of the normal and D-galactosamine injured rat liver

Rats of two age groups (6 weeks and 30 months) received (1) a single dose of 600 mg D-galactosamine (GalN)/kg body weight by intraperitoneal (i.p.) injection, (2) a single dose of 600 mg GalN/kg body weight i.p. combined with 20 mg prednisolone/kg body weight subcutaneously at the beginning of the experiment. The kinetic studies disclose that GalN produces more severe changes in old than in young animals, represented by the activities of cytoplasmic (glutamic oxaloacetic transaminase, glutamic pyruvic transaminase) and lysosomal (beta-acetylglucosaminidase beta-glucuronidase, cathepsin D) enzymes. Prednisolone diminishes the morphological liver changes as well as the biochemical disturbances in young rats. There is only a protecting effect in morphological changes of old animals within the first 12 h. The prevention of cytoplasmic enzyme activity increase is limited to the first 12 h.

[Incorporation of 14-C-Glycine during galactosamine hepatitis of young and old rats (author's transl)a*]

The present work reports on incorporation of 14-Cglycine in the proteins of three liver fractions after the application of D-Galactosamine and D-Galactosamine + Prednisolone. 164 females albino rats were used in the experiments. The results demonstrate a higher rate of glycine incorporation in thirty months than in six weeks old animals. There is also a different age depending effect of prednisolone. The results are discussed in the light of reports from the literature.ports from the literature.

[The effect of prednisolone on the development of the galactosamine hepatitis of young and old rats (author's transl)]

The present work reports on kinetic and morphological studies of one hundred female albino rats after the administration of galactosamine and galactosamine and prednisolone. The results demonstrate a significant higher increase of the serum transaminasess got and gpt in the older than in the younger rats as well as a protecting effect of prenisolone against galactosamine produced disturbances. In the thirty months old rats the protection against morphological and biochemical disturbances was only demonstrable for the first twelve hours after the administration of galactosamine.