| 1 | Transabdominal ultrasonography in preoperative staging of gastric cancer显示文摘AIM: To investigate the value of transabdominal ulbasonography (US) in the preoperative staging of gastric cancer.METHODS: A total of 198 patients with gastric cancer underwent preoperatively transabdominal US, depth of tumor infiltration was assessed in 125 patients, and lymph node metastasis was assessed in 106 patients,RESULTS: The staging accuracy of transabdominal US was 55.6%, 75.0%, 87.3% and 71.1% in T1, T2, T3 and T4 carcinomas, respectively. The overall accuracy was 77.6%.The detection rate for pancreatic invasion and liver invasion was 77.4%, 71.4%, respectively. The sensitivity, specificity,accuracy of transabdominal US in assessment of lymph node metastasis were 77.6%, 64.1%, 72.6%, respectively.Various shapes such as round, ovoid, spindle were encountered in benign and malignant lymph nodes. Majority of boa benign and malignant lymph nodes were hyperechoic and had a distinct border. Benign lymph nodes were smaller than malignant lymph nodes in length and width (P = 0.000,0.005). Irregular shape, fusional shape, infiltrative signs,inhomogenous echo were seen mainly in malignant lymph nodes (P = 0.045, 0.006, 0.027, 0.006).CONCLUSION: Transabdominal US is useful for preoperative staging in gastric cancer, although it is difficult to differentiate benign from malignant lymph nodes. | Sheng-RiLiao YingDai LingHuo KunYan LinZhang HuiZhang WenGao Min-HuaChen | 2004 | World Journal of Gastroenterology2004，10，23： | 18 |
| 2 | Shape controlled synthesis and growth mechanism of one-dimensional zinc oxide nanomaterials显示文摘Some types of ZnO nanostructures with various shape and size, including tetrapod-like ZnO (T-ZnO) nanorods, nanowiresand nanoribbons, have been obtained by controlled growth process. The nanostructures of ZnO have been investigated by means offield-emission scanning electron microscope, transmission electron microscopy and high-resolution transmission electron micros-copy. The growth mechanisms of various ZnO nanosttrctures were proposed and discussed. | YueZhang YingDai YunhuaHuang ChengZhou | 2004 | Journal of University of Science and Technology Beijing2004，11，1： | 1 |
| 4 | Growth and microstructure of AlN whiskers and dendrites显示文摘AlN whiskers or dendrites were synthesized with a sublimation-recrystallization method by using Al, AlN powders and some additives as raw materials. Whiskers with different sizes that featured high purity and good crystallinity were obtained by controlling temperature and gas supersaturation in the reaction container. The whiskers were described as long and straight single crystals of approximately 1-30 μm in diameter by the centimeter range in length. However, AlN dendrites were about 1 mm in diameter by 0.5 cm in length, and showed an obviously preferential growth orientation, i.e., perpendicular to [2111] and [1011] planes. It is concluded that the whiskers or dendrites grow via the vapor-solid mechanism. | YingDai CewenNan 等 | 2002 | Journal of University of Science and Technology Beijing2002，9，2： | 0 |
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