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排序方式: 共有165条查询结果,搜索用时 31 毫秒
1.
边界病(border disease,BD)是由边界病毒(BDV)引起绵羊和山羊的一种病毒性疾病,临床症状表现为母羊不孕、流产和死胎,以及羔羊体型异常,多毛,震颤,因此又称"多毛震颤病","茸毛症"。该病的主要传播途径是垂直传播,持续性感染的羔羊是该疾病在绵羊中传播的潜在主要传染源。山羊相对绵羊感染症状相对较轻,主要表现为流产。目前尚无公认有效的BD疫苗,做好生物安全防控,严格饲养管理,及时对疑似染病动物特别是持续性病毒血症绵羊的检测和淘汰是防治本病的重要措施。现对该病的流行现状、病原学、流行病学、鉴别诊断和预防控制等方面的研究进展进行综述,旨在为研究人员及养殖户加强对BD的认识,做好疾病的相关预防工作,减少经济损失提供参考。 相似文献
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保鲜处理对冷鲜鲟鱼肉特征性风味成分的影响 总被引:1,自引:1,他引:0
为明晰保鲜处理对冷鲜鲟鱼肉冷藏期间的特征性风味物质的影响。本实验利用固相微萃取—气相色谱—质谱联用(SPME-GC-MS)结合电子鼻和电子舌技术,对经微酸性氧化电解水和ε-聚赖氨酸两步法保鲜处理的冷鲜鲟鱼肉在冷藏期间的挥发性成分和滋味成分进行分析。电子鼻能够对挥发性成分从整体上进行分析,贮藏后期保鲜处理组和对照组的鲟鱼肉挥发性气味的数据集无重叠区域,差异明显。利用SPME-GC-MS定性鉴定出46种挥发性物质,主要包括醛类、酮类、烃类和醇类等物质,其中己醛、庚醛、苯甲醛、辛醛、壬醛、癸醛和2,5-辛二酮、苯乙酮、3,5-辛二烯-2-酮为保鲜处理组的主要挥发性物质,保鲜处理延缓了冷鲜鲟鱼肉腥味的产生以及鱼肉香味的下降。电子舌检测冷藏过程中鲟鱼肉的滋味物质时发现,保鲜处理组苦味、涩味、咸味均低于对照组,两组样品贮藏6 d后,在苦味、涩味、咸味、鲜味方面均呈显著差异。保鲜处理起到了减缓冷藏期间冷鲜鲟鱼肉风味物质下降的作用,为保鲜处理在冷鲜鲟鱼肉中的应用提供了一定的理论基础。 相似文献
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采用电子舌、电子鼻、质构仪对宣威火腿的成熟时间与品质之间的关系进行了研究。结果表明,电子鼻/舌能将不同年份的宣威火腿很好地区分开来;火腿的硬度、咀嚼性随成熟年数的增加呈上升趋势,弹性呈先增大后减小的趋势,回复性呈先减小后增大趋势。上述结果说明宣威火腿在成熟的过程中,随时间增加其风味和质构呈现一定的变化规律,从而可以通过分析其风味和质构指标来快速判断其成熟时间。本研究为对宣威火腿进行鉴别和品级评价提供了基础数据。 相似文献
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Francesco Abbate Maria Cristina Guerrera Maria Levanti Rosaria Laurà Germana Patrizia Germanà Giuseppe Montalbano Mauro Cavallaro Antonino Germanà 《Anatomia, histologia, embryologia》2020,49(6):686-694
The Atlantic salmon (Salmo salar) is a freshwater and marine fish of the family Salmonidae, widely farmed in aquaculture facilities in several countries. The salmon are carnivorous, but in aquaculture, alternative foods have been experienced. It is well known that feeding in captivity should cause adaptation and modifications of the morphological characteristics of the oral cavity, especially of tongue; therefore, the aim of this study was to investigate, by light, laser confocal and scanning electron microscopy, the morphological characteristics of the tongue dorsal surface, considering the importance of the correlations between feeding habits and the anatomy of the tongue. Scanning electron microscopy demonstrates the presence of caniniform teeth with oro-aboral orientation surrounded by numerous filiform papillae, single, fused or arranged in row. Oro-aborally, the papillae show an appearance like a rosette and they disappear at level of the root. Light and laser confocal microscopy demonstrates that the mucosa is covered by a non-keratinized stratified pavement epithelium with, in the deepest layer, the presence of a triangular structure whose apex is cranially directed and base facing aborally. In this structure, spindle-shaped cells are present, with a vimentin immunoreactivity, that for their characteristics could be adult mesenchymal stem cells. The obtained data could be useful not only for further studies on the nutrition, but it is interesting the detection of tissues typical of the embryo-fetal phase in the adult specimens tongue, thus giving a basis for studies of potential applications, if any, regarding cell therapies for different clinical indications. 相似文献
7.
M. Blatter M. Thunig F. Kretschmar A. B. M. Rijkenhuizen 《Equine Veterinary Education》2021,33(4):e97-e103
The objective of this case report is to describe the diagnostic and surgical techniques for removal of a metallic foreign body in the tongue of three adult horses. The three horses were presented for evaluation and treatment of dysphagia and marked hypersalivation of 3–5 days duration. Radiographs of the head revealed the presence of a metallic foreign body in the tongue of each horse. The foreign bodies could be precisely localised under general anaesthesia using palpation and lingual ultrasonography and/or lingual radiography in combination with a forceps as a marker. The foreign bodies were successfully removed using laparoscopic instruments creating minimal soft tissue trauma. The use of long (43 cm) small laparoscopic (5 mm) instruments enabled good visualisation of the surgical field, providing optimal conditions for successful minimally invasive surgical treatment of horses with foreign bodies in the tongue. The three horses made uneventful recoveries and 12 months after surgery were eating normally and could be ridden with a bit as per usual routine. It was concluded that using long laparoscopic instruments in combination with palpation, ultrasonography and/or radiography allowed removal of the foreign body creating minimal soft tissue trauma and allowing optimal conditions for a fast recovery. 相似文献
8.
The following two articles have been published online as part of the EVE Oncology Virtual Issue which is available online at wileyonlinelibrary.com/journal/eve 相似文献
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在梳理语言僵化研究基础上,重点探究了僵化现象产生的深层次原因,提出在二语习得过程中,应从提高语言输入质量,适时纠正语言输出,注重学习策略的训练,培养学生跨文化意识等层面出发,以帮助二语习得者缓解,并最终克服语言僵化,以期提高二语习得者的外语水平. 相似文献