Atypical parapoxvirus infection in sheep     

Smith GW  Scherba G  Constable PD  Hsiao V  Behr MJ  Morin DE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2002,16(3):287-292

This report describes the clinical and laboratory findings for 5 sheep from 3 different flocks with extensive proliferative skin lesions grossly resembling warts on the distal limbs. The lesions affected the front and rear extremities in all sheep, and 2 sheep also had lesions around the head. The sheep exhibited signs of pain when the lesions were touched, and most sheep were reluctant to move. Various empirical treatments, including systemic antibiotics, topical antibiotics, and antifungal ointments, were administered without clinical improvement. Diagnostic tests including skin biopsy and histopathology, examination of skin scrapings, bacteriology, mycology, electron microscopy of lesions, and immunohistochemical analysis demonstrated that the lesions were the result of parapoxvirus infection. All 5 animals were euthanized either because of the lack of resolution of clinical signs or a decision by the owner. These animals illustrate an atypical presentation of parapoxvirus infection in sheep (orf, contagious ecthyma, and scabby mouth). The infection appeared to be minimally contagious; however, the lesions did not spontaneously resolve. This appears to be the 1st report of such lesions in multiple sheep in North America, although similar lesions have been reported in Israel and the United Kingdom.  相似文献   

黄瓜茎叶无毛性状与果实瘤刺性状的遗传关系   总被引：10，自引：2，他引：8  

曹辰兴  张松  郭红芸 《园艺学报》2001,28(6):565-566

 黄瓜茎叶表面皮毛性状由一对核基因控制, 有毛为显性( Gl ) , 无毛为隐性( gl) 。皮毛基因参与果实表面性状的表达, 与果瘤基因( Tu-tu) 共同作用, 使果实表面出现有瘤有刺、无瘤有刺、无瘤无刺三种类型, 符合9∶3∶4 比例, 表明无毛基因对果瘤基因存在隐性上位作用。  相似文献   

中国裸子植物木材管胞瘤状层的电镜观察   总被引：4，自引：2，他引：4  

姜笑梅  周银 《林业科学》1989,25(1):58-66

本文对中国裸子植物11科、41属、99种木材管胞瘤状层进行了系统观察。瘤状层的有无及形态特征是区分裸子植物材的重要标志。此外并对5种针叶树材在一个年轮内,瘤状层从早材到晚材大小、分布密度的变化做了观察;12种针叶树材的切片,用0.5％次氯酸钠溶液处理后,瘤状物减小、以至消失;在另6个树种的管胞内,观察到瘤状层被白腐菌或软腐菌溶解。  相似文献