Pipeline Embolization Device for the treatment of cervical carotid and vertebral dissecting aneurysms.

We present three patients with dissecting and saccular aneurysms affecting the cervical carotid and vertebral arteries treated with flow diversion using the Pipeline Embolization Device (ev3 Endovascular Inc/Covidien, Plymouth, Minn). The device was successfully deployed in all three patients without complication. Follow-up imaging studies at 8 to 18 months revealed complete occlusion of all three aneurysms.

Uneven Distribution of Microgranules in Divided Lansoprazole Tablets.

Objectives: Lansoprazole is a proton pump inhibitor commonly used in children <12 months of age despite a lack of efficacy and safety data in this age group. To achieve lower doses in this population, many divide standard oral disintegrating tablets. This study seeks to determine if the medication is equally distributed within the tablet to allow for accurate dosing.

Two-component energy spectrum of cuprates in the pseudogap phase and its evolution with temperature and at charge ordering.

In the search for mechanisms of high-temperature superconductivity it is critical to know the electronic spectrum in the pseudogap phase from which superconductivity evolves. The lack of angle-resolved photoemission data for every cuprate family precludes an agreement as to its structure, doping and temperature dependence and the role of charge ordering. Here we show that, in the entire Fermi-liquid-like regime that is ubiquitous in underdoped cuprates, the spectrum consists of holes on the Fermi arcs and an electronic pocket.

Two regimes in conductivity and the Hall coefficient of underdoped cuprates in strong magnetic fields.

We address recent experiments shedding light on the energy spectrum of under and optimally doped cuprates at temperatures above the superconducting transition. Angle resolved photoemission reveals coherent excitation only near nodal points on parts of the 'bare' Fermi surface known as the Fermi arcs. The question debated in the literature is whether the small normal pocket, seen via quantum oscillations, exists at higher temperatures or forms below a charge order transition in strong magnetic fields.

ESR of coupled spin-1/2 chains in copper pyrazine dinitrate: unveiling geometrical frustration.

The spin dynamics of copper pyrazine dinitrate (Cu(C4H4N2)(NO3)2), a model spin-1/2 Heisenberg antiferromagnetic (AF) chain system, was investigated by means of electron spin resonance (ESR). Using the high-field ESR we evidenced the inequivalence of Cu sites belonging to adjacent spin chains in the ac planes of this compound. It was revealed that the dominating interchain interaction is of zig-zag-type.