Ultra-sensitive ppb-level methane detection based on NIR all-optical photoacoustic spectroscopy by using differential fiber-optic microphones with gold-chromium composite nanomembrane.

In this paper, we propose and experimentally demonstrate an ultra-sensitive all-optical PAS gas sensor, incorporating with a near-infrared (NIR) diode laser, fiber-optic microphones (FOMs) and a double channel differential T-type photoacoustic cell. The FOM is realized by Fabry-Perot interferometry and novel gold-chromium (Au-Cr) composite nanomembranes. To meet the demand of high sensitivity and flat frequency response for the FOMs, the Au-Cr composite diaphragm is deliberately designed and fabricated by E-beam evaporation deposition with 330 nm in thickness and 6.

Primary Central Nervous System Extranodal Natural Killer/T-Cell Lymphoma, Nasal Type Colliding with Meningioma.

Background: Collision tumors are defined as coexistence of 2 histologically different neoplasms occurring in the same anatomic location. Such co-occurrence of tumors in the brain is uncommon. To our knowledge, meningioma colliding with extranodal natural killer/T-cell lymphoma has not been described previously.

Primary cardiac diffuse large B-cell lymphoma with concurrent high MYC and BCL2 expression in an immunocompetent Chinese elderly woman.

Primary cardiac lymphoma is a rare type of extranodal lymphoma that involves only heart and/or pericardium. It is usually observed in immunodeficient people. However, immunocompetent patients may also suffer from this disease.

Intestinal and Limb Ischemic Preconditioning Provides a Combined Protective Effect in the Late Phase, But not in the Early Phase, Against Intestinal Injury Induced by Intestinal Ischemia-Reperfusion in Rats.

Intestinal ischemia/reperfusion (I/R) injury is associated with high morbidity and mortality. This study aimed to compare the protective efficacy of intestinal ischemic preconditioning (IIPC) and limb ischemic preconditioning (LIPC) against intestinal I/R injury and investigate their combined protective effect and the underlying mechanism. Male Sprague-Dawley rats were pretreated with IIPC, LIPC, or IIPC plus LIPC (combined), and intestinal I/R or sham operation was performed.

Spinal lesion as the first manifestation of high-grade B-cell lymphoma, with and rearrangements.

High-grade B-cell lymphoma with and rearrangements is a rare lymphoma which has highly aggressive clinical manifestations. The reporting case is a 72-year-old female presented with lumbago and weakness in the lower limb due to a mass at T8-10 revealed by computed tomography (CT) scan. Histological feature of the lesion shows an abundant and diffuse large lymphoid cells infiltration.