小球藻遗传转化技术研究进展

小球藻( Chlorella )是一种单细胞真核藻类,属绿藻门、绿藻纲、绿球藻目、小球藻科、小球藻属 [1] 。作为最早开发的真核微藻之一,具有高营养价值、生长快速、结构简单、易工业化集成等显著优点。其细胞形态为球形或椭圆形,直径3~12 μm,呈单生或聚集成群状生长 [2] ,分布广泛,多见于淡水、咸水和土壤中。作为地球上最早的生命之一,小球藻基因比较稳定,至今未见有关其基因自发突变的报道。因其富含蛋白质、脂质、维生素、活性代谢产物等多种营养物质而被公认为具有高附加值和医疗保健作用,已经被广泛应用于保健食品 [3] 、水产养殖 [4] 、生物能源 [5] 等方面,关于小球藻生物技术的研究主要集中在基因组学 [6] 、分子遗传学 [7] 、代谢机理 [8] 、大规模培养 [9] 等方向。     

高校馆阅览室期刊分类的作用新议

结合高校的发展，从实现有序管理方便读者利用，增强学生获取知识的能力，为迁入新区的院系师生厦时提供文献保障．建立分类检索系统等方面探讨了分类的作用。     

IMAGING DIAGNOSIS: MAGNETIC RESONANCE IMAGING OF A CERVICAL WOODEN FOREIGN BODY IN A DOG

This article describes the discovery of a chronic cervical wooden foreign body ventral to the left transverse processes of the cranial cervical spine using magnetic resonance imaging (MRI) in a dog that presented with chronic neck pain and lameness. The dog did not exhibit dysphagia or chronic draining tracts, the most common signs of the presumed cause, that of a penetrating oropharyngeal foreign body. The foreign body itself was represented on MR images as an oval straight-edged core within an inflammatory tissue reaction. The wood was slightly hyperintense on T2- and isointense on T1-weighted images relative to muscle. Surrounding this was a more conspicuous contrast-enhancing reactive tissue rim that was hyperintense on all pulse sequences. Adjacent musculature also exhibited diffuse edema and contrast enhancement that extended around the left cervical vertebral transverse processes and local intervertebral nerve roots. The foreign body was found to be a wooden stick upon surgical removal. MRI is an excellent method for visualizing the inflammatory tissue reactions associated with soft-tissue foreign bodies because of its contrast resolution and depiction of anatomy in multiple imaging planes.     

农业院校图书馆印刷型外文期刊利用状况的统计分析

在电子期刊蓬勃发展并日益得到读者青睐的新时代,馆藏印刷型外文期刊的利用率降低;更由于各高校图书馆的经费与存储空间有限,导致外文印刷型期刊在采购和收藏上存在很大的困难。通过对东北农业大学图书馆五年来读者阅览和复印外刊的变化统计,显示出印刷型外刊在广大的农业院校读者群中还有其存在的意义和作用,为各高校图书馆采购和收藏外刊提供可靠的数据依据。     

基于PSO-BP神经网络的外贸发展状况的评价

以我国对外贸易的实际情况为基础，建立了评价外贸发展状况的一套指标体系.使用主成分分析方法对所有评价指标进行预处理之后，借助粒子群优化算法改进了BP神经网络算法，构建了外贸发展状况的评价模型.评价模型在具体应用中，评价结果较为准确，具有一定的科学性和合理性.     

Removal of a metallic foreign body from the tongue of three horses

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.     

外文农业科技期刊时效性信息的开发利用

外文农业科技期刊在经二次文献数据加工后,存在着部分时效性信息未得到有效地利用的情况。对时效性信息进行开发利用,满足读者对外文期刊信息的多方面需求,是国家农业图书馆亟待解决的问题。在分析该馆馆藏外文期刊的时效性信息含量的基础上,提出了通过建立时效性信息数据库,同时结合网络揭示,个性化定制推送服务等方式对外文期刊的时效性信息进行开发利用,以期进一步提高国家农业图书馆馆藏外文期刊的利用效率。     

论信息时代网络语言中的外来语

随着信息时代网络交流的日益普及,网络与语言结合,形成了一种全新的语言模式—网络语言。网络语言中一个突出的现象是大量外来语杂糅其中。通过分析网络语言中外来语的表现形式,探讨网络语言中外来语流行的原因,并提出如何正确看待这一现象。     

现代女性视角的人文关注——论中国现代女作家对西方人文精神的审视和接受

中国现代文学是在全面、广泛接受外来影响的背景下产生和发展起来的,无疑,中国现代女作家的创作也受到了外来的冲击。但相比现代男作家,女作家对外来文学的审视有着自己独特的视角。她们关注并接受了西方女性人文主义,对女性自身的命运充满了关切和同情,明显带有女性意识。这些特点鲜明地体现在中国现代女作家的创作中,并影响到当代女作家的创作。     

IMAGING DIAGNOSIS—URETHROVAGINAL FISTULA CAUSED BY A MIGRATING GRASS AWN IN THE VAGINA

A young intact female dog was presented with urinary incontinence. Abdominal ultrasound revealed the presence of hyperechoic linear structures within the cranial vagina suggestive of foreign material. A computed tomography (CT) retrograde vaginourethrogram demonstrated the presence of a fistulous tract between the urethra and vagina. A presumptive diagnosis of urethrovaginal fistula due to migration of foreign material was made. The grass awn was removed with vaginoscopic‐guided retrieval. Fourteen days later, surgical repair of the fistula and an ovariohysterectomy were done. This case report emphasizes the usefulness of CT for diagnosis and precise anatomical localization of genitourinary tract fistulas.