Sugarcane variety ROC22 was used as the experimental material and water stress treatment was performed for the 4 or 5-le......

从南京鸡鸭加工厂，孝陵卫鸭场及迈皋桥鸭场共采制１１３个泄殖腔拭子，用鸡胚尿囊腔接种代法分离到４株禽流感病毒（ＡＩＶ），每个样品均有ＮＤＶ混感，纯化后的分......