Objective: To study clinical application value of 320-slice spiral computed tomography (SCTCA) for diagnosing coronary artery disease. Methods: A total of 85 patients underwent 320-slice spiral CT and selective coronary angiography (CAG). With CAG as gold standard for diagnosing coronary heart disease (CHD), sensitivity, specificity, positive predictive value, negative predictive value and accuracy were compared between 320- SCTCA and CAG. Results: Sensitivity was 95.65%, specificity was 74.36%, positive predictive value was 81.48%, negative predictive value was 93.55% and accuracy was 85.9% diagnosing coronary artery disease by 320-slice spiral CT. Conclusion: 320-slice spiral computed tomography is a simple, safe, reliable non-invasive measurement, may be used for screening coronary heart disease and reviewing after operation.

To study the effects of the material of a buildup cap to the determined value of Output FactorSc．Material and MethodsUsing two buildup caps made of plastic A－150 and copper respectively．The ionizing values of ionization chamber were measured with Farmer 2570 electrometer in the fields of all kinds of sizes respectively and calibrated to reference field．Two groups of values of Sc were obtained and compared． Results The ionizing values measured with the buildup cap of copper is evidently larger than with the buildup cap of plastic A－150 and the maximum is 14％ but the difference between two groups of the values of Sc is not much evident and all is in the range of 1％． Conclusions Though the material of high density is not equivalent with airthe effects of that to the measured value of Sc is less．So using the buildup cap made of the material of high density for the measurement of Sc is also a quite good method specially in the fields of the small sizes．

Health Knowledge, Attitudes, Practice ; Humans ; Neoplasm Staging ; Risk Assessment ; methods ; Thyroid Diseases ; surgery ; Thyroid Neoplasms ; pathology ; surgery ; Thyroidectomy ; adverse effects ; methods

Carcinoma, Squamous Cell ; pathology ; surgery ; Head and Neck Neoplasms ; pathology ; surgery ; Humans ; Lymph Nodes ; pathology ; surgery ; Lymphatic Metastasis ; Minimally Invasive Surgical Procedures ; methods ; Neck ; Neck Dissection ; methods ; Neoplasm Staging

Diabetes Mellitus ; etiology ; Hepatitis, Viral, Human ; complications ; Humans ; Insulin Resistance

Head and Neck Neoplasms ; pathology ; radiotherapy ; Humans ; Intraoperative Period ; Neoplasm Staging ; Radiotherapy, Adjuvant

Combined Modality Therapy ; Head and Neck Neoplasms ; drug therapy ; pathology ; radiotherapy ; surgery ; Humans ; Hypopharyngeal Neoplasms ; radiotherapy ; surgery ; Medical Oncology ; education ; Nasopharyngeal Neoplasms ; radiotherapy ; surgery ; Neoplasm Staging ; Otorhinolaryngologic Surgical Procedures ; education

Combined Modality Therapy ; Consensus ; Head and Neck Neoplasms ; therapy ; Humans

Biodiesel, a nontoxic,cleaning, renewable and biodegradable fuel, is expected as a substitute for conventional fossil diesel. There are three main approaches to produce biodiesel, alkali-catalysis processing, enzymatic-catalysis processing and supercritical processing. With the unique property of energy-saving and environment-friendly, enzymatic-catalysis appears a great potential for industrial application. The main bottleneck of this technology is high cost and low stability of the lipase, as well as the inactivation of lipase by methanol and so on. To settle the problem, several methods have been used including the fixed-bed bioreactor, enzyme immobilized processing, whole-cell biocatalyst, changing addition method of methanol, developing of novel acyl acceptor, enhancing methanol resistance of lipase. The main problems and the relative strategy research of the enzymatic-catalysis technology were sum up.

Objective To observe the effects of T-lymphocyte function subsets,IL-4 and IFN-γ cell factor in different dose and stage after irradiation.Methoda The C57BL/6j mice were divided into shammed irradiation group and model groups.The radiation hurt model was induced by 60Co gamma rays(0.7,1.4,2.8 and 5.6 Gy).The changes of T-lymphocyte subsets CD3,CD4,CD8,IL-4 and IFN-γ in spleen cells were analyzed by flow cytometry in acute injury stage and recovery stage after irradiation.Results The lymphocyte subsets CD3 +,CD4+ and CD8 + decreased after irradiation,which were related to the irradiation dose.At 1 day after irradiation,the decreasing level of IFN-γ was higher than that of IL-4.When irradiation dose was over 2.8 Gy,IL-4 / IFN-γ showed a markedly increased compared with control group.At 25 days after irradiation,CD3 +,CD4+,CD8 +,CD4 +/CD8 +,IL-4 and IFN-γ recovered obviously,but they did not recover to the normal level of shammed irradiation group.Conclusions The depression of mouse immune function induced by γ-irradiation might be caused by changes of CD3,CD4,CD8 and CD4/CD8 ratio,especially the imbalance of IL4 and IFN-γ.