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Pulse response in an immobilized-enzyme column: Theoretical method for predicting elution curves (1980)

Adachi, S. ; Hashimoto, K. ; Matsuno, R. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 22 (1980), S. 779-797

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: A theoretical method for predicting the elution profile of a pulse response in an immobilized-enzyme column is proposed. The method is based on a mass balance model, which is extensively used in gel chromatography. To test the method, a pulse of sucrose solution was applied to a column of spherical acrylamide gel in which was entrapped invertase from yeast, and it was eluted with 0.05M acetate buffer at pH 5.0. The elution curves of the substrate and the product were in fairly good agreement with the theoretically calculated ones. The method was extended to the system of reversible as well consecutive reactions.

Additional Material: 9 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bit.260220405

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Recurrent low-grade glioma in children with special reference to computed tomography findings and pathological changes (1990)

Morota, N. ; Sakamoto, K. ; Kobayashi, N. ; [et al.]

Springer

Child's nervous system 6 (1990), S. 155-160

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ISSN: 1433-0350

Keywords: Recurrence ; Low-grade glioma ; Children ; Malignant transformation ; Computed tomography

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Recurrent low-grade gliomas in children were studied with special reference to correlation between the computed tomography (CT) scan and pathological findings at recurrence. During the past 16 years (1970–1986) 105 cases of primary pediatric brain tumors were treated in our hospital. Seventeen of these had low-grade glioma, seven of which (five astrocytomas, one ependymoma, and one subependymoma) had recurrence of tumor by the end of 1987. The enhanced CT findings were classified into three types — cystic, false cystic, and solid, according to Lapras' classification. The pathological findings of recurrent tumors were reviewed with particular attention to malignant transformation. The results showed that in two out of three cases where CT findings had changed from initial cystic to solid type at recurrence malignant transformation was revealed. Enhanced CT scan was also useful for detecting small asymptomatic recurrent tumors in children. On the other hand, surgical procedures and adjuvant therapies demonstrated no significant relationship with recurrence. It is suggested that the recurrence of low-grade glioma in children is not rare, and that changes in findings on contrast enhanced CT might reflect malignant transformation in a recurrent tumor, necessitating a careful follow-up.