中草药复合添加剂防治兔球虫病及增重效果研究

选用无感染幼兔４２只,随机分为Ａ、Ｂ、Ｃ、Ｄ、Ｅ５组,进行防治兔球虫病和增重试验,其中Ａ组为中药加矿微加喹乙醇组,Ｂ组为中药加矿微组,Ｃ组为西药对比组,Ｄ组为感染不给药组,Ｅ组为不感染不给药组;在同样饲料、同等饲养条件下,饲养３０天。结果,Ａ组保护率９０％,增重率９８．２％;Ｂ组保护率１００％,增重率１３２．１％;Ｃ组保护率９０％,增重率７６．６％;Ｄ组兔于第１１天全部死亡;Ｅ组保护率１００％,增重率９６．２％。试验结果证明,保护率以纯中药Ｂ组最佳,Ａ组次之,增重率Ａ、Ｂ组均高于Ｃ组和Ｅ组,以Ｂ组最佳。     

抑制鹿源多药耐药结核菌中药的筛选

为了筛选对鹿源多药耐药结核菌有效的中药耐药抑制剂,通过MABA法检测24种中药的水和乙醇提取物对多药耐药结核菌及标准菌H37Rv的体外抗菌效果,将筛选出的抗菌效果好的黄连醇提物和黄连水提物采用紫外分光光度法进行活性成分含量测定,同时以MABA法与标准品比较体外抗结核菌活性。结果显示,黄连、独活和侧柏叶有明显的抗结核活性,其中黄连水粗提物和乙醇粗提物效果最佳,测得它们活性成分即总生物碱含量分别为22.74%和35.23%,并显示二者与小檗碱的体外抗结核作用相同。     

Yin-yang Balance Therapy on Regulating Cancer Stem Cells

Researches have shown that cancer stem cells,regulated by the niche where they reside,are the roots of oncogenesis,relapse and metastasis.To date,very few treatments have targeted on cancer stem cells....     

武陵地区山羊传染性胸膜肺炎的药物防治研究

为预防和控制武陵山地区山羊传染性胸膜肺炎,采用4种药物对该区山羊进行了体内预防试验和治疗试验,结果表明:泰妙菌素和红霉素对山羊传染性胸膜肺炎霉形体感染具有预防作用,且泰妙菌素和红霉素预防效果最好,环丙沙星、四环素预防作用可靠性差;用4种药物对山羊传染性胸膜肺炎自然病例和人工病例做治疗及增重试验,结果表明:与对照组相比,环丙沙星组,四环素组差异显著,增重较明显,泰妙菌素组和红霉素组差异极显著,增重非常明显。     

Enhanced micropropagation of Dendrobium huoshanense C.Z. Tang et S.J. Cheng through protocorm-like bodies: The effects of cytokinins,carbohydrate sources and cold pretreatment

The effects of cytokinins, carbohydrate sources and cold pretreatment on the conversion of protocorm-like bodies (PLBs) to shoots were investigated for the enhancement of micropropagation of Dendrobium huoshanense C.Z. Tang et S.J. Cheng, an endangered medicinal plant in China. The effects of cytokinins and carbohydrate sources on the conversion of PLBs to shoots depended on their types and concentrations. The best results in terms of shoot development from PLBs occurred on 1/2 MS medium supplemented with 20 μM kinetin and 10 g l⁻¹ maltose. Cold pretreatment at 10 °C for 1–2 weeks significantly enhanced the conversion of PLBs to shoots, and over 1300 shoots were obtained from one gram of PLBs after 3 months of culture. The developed shoots were rooted on growth regulator-free MS medium supplemented with 8 g/l banana paste to give complete plantlets, which were successfully acclimatized with a survival rate of approximately 65%. The results indicate that a suitable cold pretreatment (10 °C for 1 week) followed by the use of 20 μM kinetin and 10 g/l maltose in 1/2 MS medium would produce a large number of shoots from PLBs for plantlet regeneration of D. huoshanense.     

棉花药害的原因分析及对策

调查分析了棉花药害的症状和产生原因 ,提出了药害预防及补救措施 ,对保证棉花安全生产具有重要指导意义。     

基于APC容错存储器的设计

研究半导体ＲＡＭ的容错。介绍了存储器容错技术；给出了片上容错存储器的系统设计，并对系统的可靠性进行了评估。     

Epidemiological studies of pig diseases: 1. Use of French protocols for risk factor assessment to predict the health status of Australian herds

Objective To determine in Australian pig herds the accuracy of French protocols for risk factor assessment.
Procedure Data on health indicators and risk factors were collected for three syndromes, 'pre-weaning diarrhoea', 'post-weaning diarrhoea' and 'respiratory problems', using the French protocols. The protocols were used on 118 occasions in 32 Western Australian pig herds during 3 years (1988 to 1991).
Results There was a wide variation in pre-weaning performance, for example growth rate was 107 to 273 g/day (< 200 g/day in 33% of herds). Respiratory lesions at weaning were associated with poor pre-weaning performance. Post-weaning (21 days after weaning) growth rate was 114 to 408 g/day (< 250 g/day in 54% of herds). In the grower herds, 91% of herds had pneumonia, and growth rate was 439 to 625 g/day (< 550 g/day in 54% of herds). Pleurisy as well as pneumonia was associated with reduced growth rate. The risk factor most closely associated with respiratory health status was air volume per pig.
Conclusion Risk factors were most accurate at predicting the health status in post-weaning problems. A weaning weight of at least 7.9 kg and weaning age of 30 days optimised weaner performance. Stocking densities and shed designs providing at least 3 m³ air volume and 0.6 m² floor space per pig throughout the growing phase should be considered for an improved respiratory health status. Australian pig sheds often do not provide a satisfactory environment for optimum health. The technique of risk factor assessment as an aid to the maintenance of health in pig herds is applicable in Australia, but further research is necessary to determine the most important Australian risk factors.     

广东省中草药种植业现状与发展趋势

广东省地处岭南生物资源丰富，盛产南药，道地药材种类繁多，是我国主要的中药材种植、生产、 加工和交易集散地，但是与传统农业相比，中草药种植水平相对落后。中草药种植是中药农业的基础，在生产上， 中药材的育种、植保和栽培不受重视，药农缺乏科学的技术指导，导致种植效益低下。中药农业是产业结构调 整和供给侧改革的重要内容之一，广东省对中药农业的发展日益重视。对广东省在中药农业领域中的资源收集 评鉴、品种选育、标准化种植等种植环节的现状以及面临的问题进行综述，以期为今后广东省中药农业健康和 可持续发展提供支持。     

公钥密码算法及特点

随着计算机网络的发展，信息安全要求的日益提高，公钥密码算法体现出了秘密密码算法不可替代的优越性。本文详细介绍了公钥密码体制常用的算法及其所支持的服务，并就公钥密码新的研究方向进行了展望。