ABSTRACT
A trapping reagent for formaldehyde, based on the pararosaniline reaction, was evaluated as a method of determination of formaldehyde in the aqueous or vapour phase. Collection of formaldehyde vapour relied upon passive diffusion of formaldehyde into the trapping media and quantitative results were obtained without the need for liquid impingers, bubblers or active sampling pumps. Moreover, a novel, hand-held absorption spectrophotometric measurement device was designed to provide on-site, quantitative measurements. It is proposed that the full measurement system devised would be ideally suited to specific sampling applications such as those found in museum enclosures.
ABSTRACT
Light and electron microscopic evaluation of segments of human jejunum (bypassed for 3 1/3 years in treatment of morbid obesity) and ileum (bypassed for 6 years as a Thirty-Vella fistula in treatment of postsurgical fistula) showed no obvious evidence of widespread mucosal atrophy. The findings contrast with those reported in experimental animals and in most human patients with ileal urinary conduits, where atrophy of the isolated segment is the rule. Perhaps nonluminal factors in the human subject are sufficient to maintain small intestinal mucosa for long periods in the absence of intestinal chyme.
