Bioreactor operated production of lipase: castor oil hydrolysis using partially-purified lipase.

A highly stable lipase from Pseudomonas aeruginosa KKA-5 was produced by batch cultivation technique employing shake flask and 5 L-bioreactor. The bioreactor was run at different airflow rates. Low airflow rates (1 and 3 L/min), did not lead to effective growth and lipase production. Growth increased by about one order and lipase production increased by about 6 times, at an airflow rate of 5 L/min. Lipase production occurred during decelerated cell growth. A highly stable lipase was produced which retained its activity in the running bioreactor, even after a period of one month. This stable lipase was partially-purified using ammonium sulphate precipitation technique. Castor oil was hydrolyzed using 300U crude and partially-purified lipase, each. Approximately 21-fold, partially-purified lipase could hydrolyze 81% castor oil within a period of 96 hr, where as only 63% hydrolysis was obtained, in 216 hour, when crude lipase was used.

Congenital localized multiple fibromatosis: a case report.

Clinical, histopathologic and electronmicroscopic findings in a case of congenital localized multiple fibromatosis of interscapular region are presented. This 10 year-old Japanese girl developed this lesion since she was 3 weeks old, metastases have never been observed. The histological and electron-microscopic features point to the hamartomous origin of this tumor with partial differentiation of its cells towards myofibroblasts and atypical fibroblasts. The differential diagnosis from other soft tissue tumors in infancy and early childhood is discussed.