Coherent acoustic phonons in a coupled hexagonal boron nitride-graphite heterostructure.

Femtosecond optically excited coherent acoustic phonon modes (CAPs) are investigated in a free-standing van der Waals heterostructure composed of a 20-nm transparent hexagonal boron nitride (hBN) and a 42-nm opaque graphite layer. Employing ultrafast electron diffraction, which allows for the independent evaluation of strain dynamics in the constituent material layers, three different CAP modes are identified within the bilayer stack after the optical excitation of the graphite layer. An analytical model is used to discuss the creation of individual CAP modes.

Droplet etching of deep nanoholes for filling with self-aligned complex quantum structures.

Strain-free epitaxial quantum dots (QDs) are fabricated by a combination of Al local droplet etching (LDE) of nanoholes in AlGaAs surfaces and subsequent hole filling with GaAs. The whole process is performed in a conventional molecular beam epitaxy (MBE) chamber. Autocorrelation measurements establish single-photon emission from LDE QDs with a very small correlation function g ((2))(0)≃ 0.

A nitric oxide scavenger protects against pulmonary inflammation following hemorrhagic shock.

Hemorrhagic shock (HS) elicits an inflammatory response characterized by increased cytokine production and recruitment of PMN which we previously found to be iNOS dependent. In this study we attempted to remove excess induced-NO by administration of the NO scavenger, NOX, with the goal of suppressing proinflammatory signaling and reducing organ damage. Rats subjected to HS (MAP = 40 mmHg for 100 min) followed by resuscitation and examined 24 h later demonstrated histological signs of lung injury including pulmonary edema as well as an 8.

[Case report: emergency surgery of a giant scrotal hernia].

We present the case of a 61-year-old patient, who had developed a giant scrotal hernia during the course of 30 years. The patient was transferred to our service after stabilization of hemorrhagic shock due to bleeding from varicosis of the giant scrotal sack. The urgent operation was performed by resection of parts of small intestine, colon ascendens, transversum, and the left testis.