致倦库蚊有机磷抗性相关扩增酯酶B基因的多样性

本实验从佛山和成都两地的致倦库蚊群体中筛选出３个酯酶类型不同的有机磷（ＯＰ）抗性品系，ＦＳ－１、ＦＳ－２和ＣＤ－１品系。各品系的酯酶基因Ｂ扩增水平、酯酶活性和ＯＰ抗性水平三者一致。各品系酯酶Ｂ基因限制性酶切片段比较分析表明，我国的ＯＰ抗生库蚊群体中不仅有世界性分布的酯酶Ｂ１和Ｂ２，而且在佛山和成都地区各有一个新的独立扩增的酯酶Ｂ，分别命名为Ｂ６和Ｂ７。     

A leg ulcer as manifestation of metastatic squamous cell vaginal carcinoma

Cutaneous metastasis of vaginal carcinoma is extremely rare. So far, the total number of reported skin metastasis of vaginal carcinoma is only one. We present another case with an unusual manifestation of vagina carcinoma metastasis: skin metastasis presenting as a leg ulcer on the lower leg.     

Sonographic patterns in extranold abdominal lymphomas

Between 1980 and 1993, 680 patients with non-Hodgkin's lymphomas (NHL) and Hodgkin's disese (HD) were studied by ultrasonography. In 210 patients a total of 254 extranodular abdominal lymphoma inflitrates were diagnosed. Infiltrates were confirmed histologically in 118 patients and through the clinical course and follow-up studies in 92 patients. Lymphoma infiltrates were seen most frequently in the spleen (N = 101), the gastrointestinal tract (n=70), the liver (n = 47), the kidneys (n = 17) and other organs (n = 19). The sonographic features of lymphomatous infiltrates in different extranodal sites are described, and possible correlations between lymphoma subtypes and sonographic texture characteristics are investigated. Different infiltration patterns of lymphoma subtypes could be indentical in liver and spleen. High-grade NHLs most frequently showed large-nodular lesions, whereas low-grade NHLs and HD showed a tendency towards small-nodular or diffuse lesions. The role of ultrasonography in the clinical management of lymphoma pateins is discussed.Correspondece to: C. Görg