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Diminutive colonic polyps: An indication for colonoscopy (1992)

Opelka, Frank G. ; Timmcke, Alan E. ; Gathright, J. Byron ; [et al.]

Springer

Diseases of the colon & rectum 35 (1992), S. 178-181

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ISSN: 1530-0358

Keywords: Colonoscopy ; Screening ; Hyperplastic polyps

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract A prospective study investigated the significance of solitary diminutive colonic polyps discovered during screening flexible sigmoidoscopy. Eighty-two patients with a solitary diminutive polyp (≤5 mm) underwent colonoscopy after cold biopsy of the index polyp. Of the patients with adenomatous index polyps, 42.5 percent had proximal neoplastic polyps. Of the patients with hyperplastic index polyps, proximal neoplastic polyps were found in 38.9 percent. These data suggest that diminutive polyps identified during flexible sigmoidoscopy, whether adenomatous or hyperplastic, place the patient in the intermediate risk group for colorectal neoplasia. We recommend that any patient with polyps seen during screening sigmoidoscopy, regardless of histopathology, should undergo colonoscopy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02050675

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Dynamic scaling of the cluster-size distribul nucleation: Precoalescence stages (1994)

Shi, Frank G. ; Seinfeld, John H.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 40 (1994), S. 11-18

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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: The dynamic evolution of the cluster-size distribution (CSD) in the precoalescence stages of nucleation and growth for sizes within and beyond the nucleation barrier layer (NBL) has been obtained. The existence of several universal kinetic laws of nucleation is predicted. In the precoalescence stages of nucleation, the CSD for sizes within and beyond the NBL obeys dynamic scaling relations. In a range of sizes beyond the NBL, the CSD exhibits a universal power law behavior, the exponent of which depends only on the interphase monomer transfer mechanism. Based on the results for the CSD, a general foundation is developed for nucleation kinetic measurements including the determination of the nucleation barrier and the inter-facial monomer transport rate by measuring the CSD. A preliminary comparison with an experimental study confirms the predicted dynamic scaling and the power law behavior of the CSD in the early stages of nucleation and growth.

Additional Material: 4 Ill.