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Adenocarcinoma complicating Crohn's disease (1993)

Michelassi, Fabrizio ; Testa, Giuliano ; Pomidor, William J. ; [et al.]

Springer

Diseases of the colon & rectum 36 (1993), S. 654-661

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ISSN: 1530-0358

Keywords: Small bowel adenocarcinoma ; Colorectal adenocarcinoma ; Crohn's disease

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract We report on 14 cases of intestinal adenocarcinoma complicating Crohn's disease, seven occurring in the small bowel and seven in the large bowel. In both locations, two-thirds of patients were male. The average ages at the time of diagnosis of Crohn's disease and of cancer were similar between the two groups of patients: 28 and 48 years, respectively. The diagnosis of cancer was suspected or obtained preoperatively in only four cases of large bowel cancer; in two patients with large bowel cancer and five with small bowel cancer, the diagnosis was made at laparotomy. In the remaining cases, only careful histologic examination revealed the carcinoma. Six small bowel cancers were located in the ileum, and five colonic cancers were distal to the splenic flexure. Two small bowel and one large bowel cancer were multifocal and had surrounding mucosal dysplasia. All tumors, except one small bowel cancer, underwent resection. Survival correlated with stage of tumor at resection; no patient with regional or distant metastasis survived five years, in comparison with an 83 percent five-year actuarial survival rate of patients with tumor confined to the intestinal wall. Mean survival was six months for patients with small bowel cancer in comparison with 65 months for patients with large bowel cancer, reflecting a tendency toward more advanced lesions in the small bowel cancer group.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02238592

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Oil-assisted agglomeration for toner deinking: Population balance model and experiments (1997)

Snyder, Bret A. ; Berg, John C.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 43 (1997), S. 1480-1487

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ISSN: 0001-1541

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: This study examines the selective agglomeration of hydrophobic toner particles from a repulped paper fiber slurry by adding an immiscible oil that preferentially wets the toner particles. Effects of cationic starch additives, agitation rate, time, temperature and oil composition are examined experimentally in terms of the dynamic and steady-state evolution of the particle-size distribution produced. A simple, but effective, population balance model is solved numerically to simulate the agglomeration process and provides quantitative relationships between process variables and the effectiveness and rate of agglomeration. These relations are simple and clear. The process is shown to be controlled by the composite effect of the aforementioned variables on the aggregation and breakup rates, and the observed hehavior is understood in these terms. Practical recommendations for agglomeration, a process potentially useful for deinking toner-printed paper, are deduced from the results.

Additional Material: 7 Ill.