ABSTRACT
In order to characterize a thermostable urate oxidase (Uox) from Microbacterium sp. strain ZZJ4-1, we cloned its gene (uox). The open reading frame of uox contained 894 base pairs and encoded a protein with 297 amino acids. Alignment of gene sequences indicated there was no obvious identity with the most reported uox and that 72% identity was found with uox from Arthrobacter globiformis. We inserted the gene into the plasmid pET-15b to construct an expression vector pET-15b-uox and got it induced expression in Escherichia coli BL21 (DE3). After the purification of the recombinant Uox by the HisBind column, we studied some properties of it. It was composed of subunits with a molecular mass of about 35 kDa. The optimal temperature and pH was 30 degrees C and pH 7.5. It was stable below 65 degrees C and from pH 8.5 to 11.0. The Km value was 0.22 mmol/L with the uric acid as the substrate. Ag+, Zn2+, CU2+ and SDS could totally inhibit its activity while Tween 20, Tween 80 and Triton X-100 had a slight promotion effect. The thermal stability of this enzyme was the most excellent among the reported recombinant Uox. Based on this property, it would be very useful in the application.
Subject(s)
Actinomycetales , Genetics , Amino Acid Sequence , Cloning, Molecular , Enzyme Stability , Escherichia coli , Genetics , Metabolism , Genetic Vectors , Genetics , Molecular Sequence Data , Recombinant Proteins , Genetics , Urate Oxidase , Genetics , MetabolismABSTRACT
Objective To explore the change of ECG after chemotherapy and radiotherapy in treatment of patients with breast cancer. Methods 58 patients with breast cancer were treated with surgery,after operation the observation group were treated with chemotherapy and radiotherapy,and the control group was given chemotherapy singly.The change of ECG was compared between two groups. Results In the observation group,11 patients had abnormal ECG(37.93%),In the control group,2 patients had abnormal ECG(9.52%)(x2=8.03,P ＜0.05＝.In addition,in the observation group the incidence of abnormal ECG in the patients with left breast cancer(7/15)was slightly higher than that with right breast cancer(4/14)(x2=1.01,P ＞ 0.05). Conclusion The treatment of chemotherapy combined with radiation could significantly increase cardiac toxicity in the patients with breast cancer.
ABSTRACT
OBJECTIVE To conduct the centralized management of the medical instrument in the supply room,and to assure the quality and validation of the clinical nursing and the patient safety. METHODS The cleaning and packing procedures of the instrument were standardized.The reusable instrument would be concentrated to clean,pack,and sterilize.To create a photograph management system,and use the photos to distinguish specialized instrument. RESULTS The instrument was reprocessed in the supply room instead of the clinical departments by the method of the centralized management of the instrument,which provided better instrument care and reprocessing. CONCLUSIONS The supply room conducts the centralized management of the medical instrument and enhances the quality of the instrument reprocessing.