Fourier-transform Raman spectroscopy applied to photobiological systems.

Fluorescence and initiation of photoreactions are problems frequently encountered with resonance Raman spectroscopy of photobiological systems. These problems can be circumvented with Fourier-transform Raman spectroscopy by using the 1064-nm wavelength of a continuous wave neodymium-yttrium/aluminum-garnet laser as the probing beam. This wavelength is far from the absorption band of most pigments.

The maintenance of gastric mucosal barrier during the early erosive gastritis component of stress ulceration.

The spectrum of gastric stress ulceration includes early erosive gastritis, which develops within 48 hours of injury, as well as a late ulcerative component. Previous clinical studies with young healthy volunteers as controls have implicated increased back diffusion of hydrogen ions in the pathogenesis of stress ulceration. The present study compares the gastric mucosal integrity of injured patients to an age-matched control population of patients who had undergone elective intra-abdominal operations.