Isolation of infectious bronchitis virus from a flock of racing pigeons   总被引：6，自引：0，他引：6  

DA BARR  RL REECE  D O'ROURKE  C BUTTON  JT FARAGHER 《Australian veterinary journal》1988,65(7):228-228

  相似文献   

Iron oxides in two Oxisols from the Brazilian coastal plain   总被引：1，自引：0，他引：1  

J. D. FABRIS  M. RESENDE  E. GALVAO DA  SILVA J. M. D. COEY 《European Journal of Soil Science》1985,36(4):543-550

Two Oxisols from the B2 horizon at similar locations 2 km apart on the Brazilian coastal plain with a udic, isohyperthermic regime were practically identical in chemical composition but differed markedly in colour; one was a dark reddish brown, the other a pale ochre. Mossbauer spectra at 295 K, 80 K and 4.2 K indicated a clear difference in iron oxide mineralogy. Iron was present as aluminous hematite and goethite, with Al substitutions of approximately 20% in the two phases. However, the relative proportion of iron present in hematite and goethite was 45:55 in the first sample and 12:88 in the second. Possible reasons for these differences are discussed.  相似文献   

Culture and propagation of microsporidia of veterinary interest     

Maria Anete LALLO  Lidiana Flora VIDOTO DA COSTA  Anuska Marcelino ALVARES-SARAIVA  Paulo Ricardo Dell’Armelina ROCHA  Diva Denelle SPADACCI-MORENA  Fabiana Toshie de Camargo KONNO  Ivana Barbosa SUFFREDINI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2016,78(2):171-176

  相似文献   

新疆农业产业集群现状及发展对策研究     

龚新蜀  达月霞 《北方园艺》2016,(1):169-172

农业产业集群是推动农村经济发展的重要产业组织形式。现以新疆为研究对象,从新疆农业产业集群的发展优势和现状出发,结合区位商进行分析,发现当前新疆农业产业集群主要面临产业链条短、市场需求反应慢、支持服务体系不健全等问题,最后从产业链、科技投入、市场需求和网络体系等角度提出新疆农业产业集群发展的对策。  相似文献   

Feline Perineal Urethrostomy: A Review of Past and Present Literature     

Alicia K. Nye  Jill K. Luther 《Topics in companion animal medicine》2018,33(3):77-82

Urethral obstruction is a potentially fatal condition and in cases of recurrent obstruction or an identified cause that is refractory to medical management, a urethrostomy may be performed for definitive treatment. Perineal urethrostomy is the surgical creation of a permanent stoma in the wider pelvic urethra via anastomosis to the perineal skin. Diagnosis of the underlying cause of obstruction, proper perioperative treatment, and an understanding of the anatomy and surgical technique, are imperative to the success of this procedure. This review intends to highlight these aspects, as well as the common complications and expected prognosis to aid decision making in the management of these cases.  相似文献   

传统梅园美感生成机制对当代梅花专类园设计的启示     

达婷  陈瑞丹 《北京林业大学学报》2012,(Z1):175-178

梅花是中国传统园林喜用的主题植物之一。传统梅园所追求的赏梅意境是一种以传统文人的赏梅意趣为导向的、浪漫的梅园境界。传统文人所追求的"物我交融"的梅花审美取向在当代梅花专类园设计中仍然起到指导梅花种植和造景的作用。通过解析传统梅园美感生成机制,并以现代环境美学观点研究传统梅园的美感生成机制,指出梅园的环境美感是由感觉价值、形式价值和综合价值构成,并据此启发当代梅花专类园设计。  相似文献   

不同苜蓿品种对豌豆蚜生长发育的影响     

朱亚灵  达丽婷 《草原与草坪》2012,32(6):52-55

研究了甘农3号、甘农5号、陕北、游客、俄罗斯5个苜蓿品种在15、18、21、25和28℃及相对湿度为80%条件下,对豌豆蚜（Acyrthosiphon pisum）生长发育的影响。结果表明,不同温度条件下5个苜蓿品种对豌豆蚜成若蚜生长发育的影响不同,成若蚜发育历期均以陕北苜蓿上的最长,在各温度下甘农5号苜蓿上的最短,在各温度下,2个品种间均差异极显著（P〈0.01）;不同苜蓿品种上豌豆蚜成若蚜的历期大小均为陕北〉甘农3号〉游客〉俄罗斯〉甘农5号;5个供试苜蓿品种上豌豆蚜的存活率以俄罗斯和陕北苜蓿最小,甘农3号和甘农5号最高。  相似文献   

基于“广义梯度理论”的乡村旅游发展途径分析     

笪玲 《南方农业学报》2012,43(4):544-547

【目的】探索乡村旅游发展广义梯度推进途径,以促进乡村旅游的良性发展。【方法】通过对璧山县旅游资源、交通及企业发展等梯度要素的分析,获得璧山县乡村旅游发展的广义梯度结构,并提出其广义梯度推移途径。【结果】璧山县乡村旅游可以划分为3个梯度,一级梯度包括璧城乡村旅游组团,二级梯度包括璧北乡村旅游组团和璧南乡村旅游组团,三级梯度包括梅江河乡村旅游组团。【建议】优先开发高梯度旅游区,打造区域乡村旅游精品;有效实施广义梯度推移,延缓乡村旅游产品生命周期;加速广义梯度推移,实现乡村产业立体协调整合,以科学地推动璧山县乡村旅游发展。  相似文献   

Binding of host glycosaminoglycans and milk proteins: possible role in the pathogenesis of Streptococcus uberis mastitis     

Almeida RA  Luther DA  Nair R  Oliver SP 《Veterinary microbiology》2003,94(2):131-141

The role of indirect binding of host proteins through glycosaminoglycans (GAGs) on adherence and internalization of Streptococcus uberis to bovine mammary epithelial cells was evaluated. Preincubation of S. uberis with GAGs followed by incubation with fetal bovine serum (FBS), bovine milk or milk proteins resulted in greater adherence to and internalization of S. uberis into mammary epithelial cells than observed in untreated controls. Highest values were detected, when final incubation was done with milk. Greater adherence to and internalization into mammary epithelial cells were observed when heparin sulfate (HEP) and milk were used compared with any other GAG and FBS. When individual milk proteins were used, greatest adherence and internalization were observed when S. uberis strains were pretreated with HEP followed by treatment with beta-casein. The findings of this study illustrate a pathogenic strategy of S. uberis that may occur during the very early stages of infection.  相似文献   

Number of Follicular Waves and Their Effect on Pregnancy Rate in the Cow     

HA Çelik  &#; Ayd&#;n  S &#;enda&#;  DA Dinç 《Reproduction in domestic animals》2005,40(2):87-92

In the study, the relationship of follicular growth waves, oestradiol and pregnancy rates were investigated during oestrus cycle in cows. A total of 22, Brown Swiss cows (3-5 years old) were used for the study. The ovaries of animals were examined from sixth day of cycle to next oestrus by ultrasound. The follicles that were present in the ovarium were recorded. Follicular growth was observed every day by means of ultrasound examination. The blood samples were taken for analysis of oestradiol simultaneously with ultrasound examinations. The oestrus animals were inseminated. Each animal that inseminated was examined by ultrasound on day 28 after insemination for pregnancy diagnosis. Two follicular growth waves were observed in nine of 22 (40.9%), three waves in 13 of 22 (59.1%) animals. The oestradiol was found in the same concentration but in different release patterns between two and three waves animals. Pregnancy rate in cows with three and two follicular waves did not differ. In conclusion, emergence of three waves of follicular growth was higher in Brown Swiss cows, the analysis of oestradiol could be used for determination of the wave numbers and the animals with different waves may have had the same pregnancy rates.  相似文献