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  • 2000-2004
  • 1995-1999  (2)
  • Atomic force microscopy  (1)
  • Gastrostomy  (1)
  • 1
    ISSN: 1437-9813
    Keywords: Key words Corrosive esophageal stricture ; esophageal bougienage ; Endless-loop bougienage ; Gastrostomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors present a safe, conservative method of endless-loop bougienage (ELB) through the oral cavity and esophagus to a gastrostomy without general anesthesia in three children with corrosive esophageal burns treated since 1966. Esophagogastroscopy was performed to evaluate for esophagitis at an early phase after ingestion of the caustic substance. When esophageal stricture formation was recognized after subsequent conservative treatment, a feeding gastrostomy was made. A continuous string loop with plummets of progressively larger size was positioned to pass through the patient's oral cavity and esophagus to the gastrostomy. Strictures were found in the upper esophagus in two patients and in the middle and lower esophagus in one. The gastrostomy was performed 15␣months, 20 days, and 2 months after the injury, respectively, and the periods of ELB were 3, 5, and 2½␣years, respectively. The patients were able to start eating at 26, 42, and 29 months after injury, respectively. They are now 30, 18, and 17 years old, and slight dysphagia remains in patients 1 and 2. No patient developed esophageal carcinoma at the site of the corrosive stricture. Our method of ELB through the patient's oral cavity and esophagus to the gastrostomy appears to be safe, reliable, and useful. We believe that most caustic esophageal strictures in children can be treated by this conservative measure.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European biophysics journal 27 (1998), S. 63-68 
    ISSN: 1432-1017
    Keywords: Key words DNA ; Enzyme activity ; Atomic force microscopy ; Exonuclease ; BAL 31 nuclease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract We have applied atomic force microscopy (AFM) to the measurement of BAL 31 nuclease activities. BAL 31 nuclease, a species of exonuclease, is used to remove unwanted sequences from the termini of DNA before cloning. For cutting out only the appropriate sequences, it is important to know the nuclease properties, such as digestion speed and the distribution of the lengths of the digested DNA. AFM was used to obtain accurate measurements on the lengths of DNA fragments before and after BAL 31 nuclease digestion. We analyzed 4 DNAs with known number of base pairs (288, 778, 1818, and 3162 base pairs) for correlating the contour length measured by AFM with the number of base pairs under the deposition conditions used. We used this calibration for analyzing DNA degradation by BAL 31 nuclease from the AFM measurement of contour lengths of digested DNAs. In addition, the distribution of digested DNA could be analyzed in more detail by AFM than by electrophoresis, because digested DNA were measured as a population by electrophoresis, but were measured individually by AFM. These results show that AFM will be a useful new technique for measuring nuclease activities.
    Type of Medium: Electronic Resource
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