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Article in Chinese | WPRIM | ID: wpr-663712


Objective· To explore the frequency, nondetection rate, and clinical importance of incidental extracerebral findings (IECFs)on brain nonenhanced magnetic resonance imaging(MRI). Methods · The MRI data of 7 930 cases with suspected intracerebral lesionin were retrospectively analyzed. IECFs were categorized as E1 (clinically unimportant, e.g., sinus mucosal thickening), E2 (likely unimportant, e.g.,pharyngeal mucosal symmetrical thickening), and E3 (potentially important, e.g., pharyngeal mucosal asymmetrical thickening). The nondetection rate was determined by comparing the results of the structured approach with the initial MRI reports. The medical records were examined for patients with E3 IECFs to assess clinical importance and outcome of these lesions. Results · A total of 5 992 IECFs were found in 4 213 patients (53.13%, 4 213/7 930). IECFs with E1 was 82.2% (4 924/5 992), E2 was 16.6% (995/5 992) and E3 1.2% (73/5 992). Overall IECFs and E1 findings were occurred more commonly in male patients (P=0.000, P=0.024). And the statistically significant difference was also found among different age groups (P=0.000). The nondetection rate was 56.9% (3 409/5 992) for overall IECFs and 32.9% (24/73) for E3 IECFs. Of the 73 patients with E3 IECFs, 34 (46.6%) received final diagnosis and appropriate treatment during the study period. Conclusion · IECFs are prevalent in clinical patients on brain MRI with a nondetection rate of 32.9% for potentially important (E3) findings. The reporting of IECFs according to clinical importance is helpful for patients' management.

Chinese Journal of Biotechnology ; (12): 567-571, 2006.
Article in Chinese | WPRIM | ID: wpr-286248


The glucoamylase gene (glaA) of Aspergillus niger CICIM F0410 was cloned, sequenced and expressed. The integrated plasmid pBC-Hygro-glaA carrying the glaA was constructed and transformed into A. niger F0410. Transformants with multiple copies of glaA integrated in the chromosome were selected by 150 microg/mL hygromycin B and identified by real-time PCR. Two to three multiples of glaA in the chromosome were found to be optimal for higher expression of glucoamylase. Shake-flask fermentation under optimal conditions showed that glucoamylase secreted by the transformant GB0506 was 17.5% higher than parental strain F0410 at the end of fermentation. In conclusion, increasing copy number of glaA by chromosomal integration significantly improves the yield of glucoamylase in the industrial strain of A. niger.

Aspergillus niger , Genetics , Cloning, Molecular , Glucan 1,4-alpha-Glucosidase , Genetics , Plasmids , Recombinant Proteins