饲料业面临的困境和机遇

在金融风暴和多重价格压力影响下,我国饲料产业面临严峻考验 与此同时,四川灾后重建和4万亿内需投资,又会对饲料产业形成强大拉动力。认清形势,抓住机遇,重视自身变革,饲料业必能走出困境,走上良性发展之路。     

Changing trends in mastitis

The global dairy industry, the predominant pathogens causing mastitis, our understanding of mastitis pathogens and the host response to intramammary infection are changing rapidly. This paper aims to discuss changes in each of these aspects. Globalisation, energy demands, human population growth and climate change all affect the dairy industry. In many western countries, control programs for contagious mastitis have been in place for decades, resulting in a decrease in occurrence of Streptococcus agalactiae and Staphylococcus aureus mastitis and an increase in the relative impact of Streptococcus uberis and Escherichia coli mastitis. In some countries, Klebsiella spp. or Streptococcus dysgalactiae are appearing as important causes of mastitis. Differences between countries in legislation, veterinary and laboratory services and farmers' management practices affect the distribution and impact of mastitis pathogens. For pathogens that have traditionally been categorised as contagious, strain adaptation to human and bovine hosts has been recognised. For pathogens that are often categorised as environmental, strains causing transient and chronic infections are distinguished. The genetic basis underlying host adaptation and mechanisms of infection is being unravelled. Genomic information on pathogens and their hosts and improved knowledge of the host's innate and acquired immune responses to intramammary infections provide opportunities to expand our understanding of bovine mastitis. These developments will undoubtedly contribute to novel approaches to mastitis diagnostics and control.     

酒制熟地黄炮制过程中梓醇的变化趋势及变化机理

为研究酒制熟地黄炮制工艺过程中梓醇的变化趋势和变化机理，利用HPLC检测酒制熟地黄炮制过程中不同时间点梓醇的含量，并利用FT-IR结合变温附件获取梓醇在不同温度点的红外光谱信息。结果表明，酒制熟地黄炮制过程中，梓醇含量整体呈下降趋势，但不同时间段梓醇含量下降率不同。梓醇含量下降的原因是其热稳定性较低，在温度90～100℃之间，其结构就发生变化。所以，生地黄产地加工焙干时，温度不能太高，以免梓醇含量下降；熟地黄炮制过程中，时间不能太短，以免“火候”不到。     

Changing morphology of Eperythrozoon ovis

Light microscopy studies of Eperythrozoon ovis in sheep revealed that Giemsa stain was only less reliable than acridine orange as a means of parasite identification when low parasitaemias were present. The morphology of E ovis altered as the degree of parasitaemia increased.     

猪圆环病毒病的病情变化趋势

美国猪兽医师年会上提交了很多与猪Ⅱ型圆环病毒(PCV2)有关疾病的报告。人们对于仍在全球范围肆虐的猪Ⅱ型圆环病毒(PCV2)的了解正在日益增多。今年我们已从多个途径获得了有关此病的新信息,而最新的信息是在美国猪兽医     

一种应对残缺人脸图像的3D人脸识别方法

3D人脸在采样不完整时,很难对其标定特征点,进而直接影响识别正确率。本文针对这个问题提出了一种基于局部曲线特征的人脸识别方法。该方法首先计算了3D人脸在深度空间,曲率空间,和测地空间下的表示,采用SURF算法自动提取特征点,通过神经网络的方法分析特征点之间的连接线上的深度,曲率和测地信息来达到识别的目的。实验结果表明,这种自动识别特征点的方法相对于基于标定的识别方法具有更强的鲁棒性和更高的正确率。