Single beam grating coupled interferometry: high resolution miniaturized label-free sensor for plate based parallel screening.

Grating Coupled Interferometry (GCI) using high quality waveguides with two incoupling and one outcoupling grating areas is introduced to increase and precisely control the sensing length of the device; and to make the sensor design suitable for plate-based multiplexing. In contrast to other interferometric arrangements, the sensor chips are interrogated with a single expanded laser beam illuminating both incoupling gratings simultaneously. In order to obtain the interference signal, only half of the beam is phase modulated using a laterally divided two-cell liquid crystal modulator.

Inter-hospital mobile oesophago-gastro-bulboscopy emergency service.

Oesophago-gastro-bulboscopy was performed in 102 cases of acute massive haematemesis and/or melaena in different hospitals or clinics in the town of Pécs, the condition of the patients having been in general incompatible with transport to the endoscopic laboratory. The aetiology of the bleeding was clarified in 90 cases, it remained unidentified in 8 cases, though it was successfully localized. Fibreoptic endoscopy is regarded as an essential tool of early aetiological diagnosis of upper digestive tract bleedings even in centres lacking modern equipment.