X,Y, and Z: A bird's eye view on light pollution.

The global increase in light pollution is being viewed with growing concern, as it has been reported to have negative effects ranging from the individual to the ecosystem level.Unlike movement on the ground, flying and swimming allows vertical motion. Here, we demonstrate that flight altitude change is crucial to the perception and susceptibility of artificial light at night of air-borne organisms.

Real-time dynamics in spin-1/2 chains with adaptive time-dependent density matrix renormalization group.

We investigate the influence of different interaction strengths and dimerizations on the magnetization transport in antiferromagnetic spin 1/2 XXZ chains. We focus on the real-time evolution of the inhomogeneous initial state |upward arrow..

[Rotation angioplasty--initial clinical results of peripheral vascular occlusions].

After experimental investigations in postmortem human arteries, 19 patients with chronic peripheral artery occlusions were treated with a new technique between December 1986 and October 1987. In 17 patients the superficial femoral artery, and in two patients the popliteal artery, was completely occluded. The length of occlusions were between 5 and 25 cm (mean 10.

[Rotation angioplasty--a new procedure for reopening and dilating blood vessels. Experimental findings].

16 fresh postmortem specimens of human femoral and popliteal arteries with severe atherosclerosis were removed and angiography was performed. Eight vessels were completely occluded and eight showed stenoses of up to 60%. All occluded vessels were heavily calcified.