橡胶树白根病菌生物学研究

橡胶树白根病是中国进境植物检疫性病害,是世界性橡胶树的严重病害。为了能更好的了解、预防和控制橡胶树白根病,对该病菌进行生物学特性的研究,研究不同培养条件及营养环境对橡胶树白根病菌菌丝生长的影响。结果表明：病原菌在PDA＋酵母和PDA＋橡胶树根汁培养基上生长最好,PDA培养基中添加不同的糖对病原菌生长影响不同,以蔗糖、淀粉、麦芽糖、甘露糖和鼠李糖最好。PDA培养基中添加2%的氮源对病菌的生长无促进作用。该菌在10～35℃下均能生长,最适生长温度为28℃,55℃下处理10 min,病菌不能生长;pH411都可生长,最适pH8～9;黑暗能促进病原菌生长。

10种杀菌剂对橡胶树白根病菌的毒力测定

为了筛选有效防治药剂,在室内采用菌丝生长速率法测定了10种杀菌剂原药对橡胶树白根病菌的室内毒力。结果表明：戊唑醇、腈菌唑、丙环唑、抑霉唑、三唑酮、咪鲜胺、嘧菌酯、十三吗啉8种药剂对橡胶树白根病菌均具有较高的敏感性,抑菌效果较好,其EC50在0.017 7-6.013 6μg/m L,其中戊唑醇的毒力最强,EC50为0.017 7μg/m L;腈菌唑、丙环唑、抑霉唑的抑制作用较强,其EC50分别为0.027 8、0.045 6和0.077 3μg/m L。甲基托布津抑菌效果最差,EC50为41.299 0μg/m L。

Sustained virologic response following HCV eradication in two brothers with X-linked agammaglobulinaemia

X-linked agammaglobulinaemia (XLA) is a humoral immunodeficiency syndrome characterized from childhood by the absence of circulating B lymphocytes, absent or reduced levels of serum immunoglobulin and recurrent bacterial infections. For many affected patients, regular treatment with immunoglobulin is life saving. Hepatitis C viral (HCV) infection acquired through contaminated blood products is widely described in this patient cohort. The natural history of HCV infection in patients with XLA tends to follow a more rapid and aggressive course compared to immunocompetent individuals. Furthermore, standard anti-viral therapy appears to be less efficacious in this patient cohort. Here we report the cases of two brothers with XLA who contracted HCV through contaminated blood products. They were treated with a six month course of Interferon alpha-2b and Ribavirin. We report a sustained virologic response five years after completing treatment.