基于ASP.NET的造林专家系统   总被引：5，自引：0，他引：5  

胡波  吴保国  陆道调 《林业资源管理》2005,(1):63-66

基于ASP NET的设计思想和实现方法,采用知识库和专家系统原理构建造林专家系统。利用该系统辅助解决造林体系中的非结构化问题,为其规划设计的论证决策提供有力工具及手段。  相似文献   

Evaluation of a chromogenic antithrombin III assay using a fixed band spectrophotometer     

Andreasen CB  Lovelady S 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1993,22(2):42-44

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What Is Your Diagnosis?     

Andreasen CB 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1993,22(3):67-69

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Die Biologische Kontrolle der Baumwollzikade Empoasca decipiens Paoli (Homoptera: Cicadellidae) in Gewächshausgurken     

Isa Bünger  Hans-Peter Liebig  Claus P. W Zebitz 《Gesunde Pflanzen》2002,54(3-4):105-110

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Using laser to measure stem thickness and cut weed stems     

T Heisel  J Schou  C Andreasen  S Christensen 《Weed Research》2002,42(3):242-248

Summary Stem thickness of the weed Solanum nigrum and the crop sugarbeet was determined with a He–Ne laser using a novel non‐destructive technique measuring stem shadow. Thereafter, the stems were cut close to the soil surface with a CO₂ laser. Treatments were carried out on pot plants, grown in the greenhouse, at two different growth stages, and plant dry matter was measured 2–5 weeks after treatment. The relationship between plant dry weight and laser energy was analysed using two different non‐linear dose–response regression models; one model included stem thickness as a variable, the other did not. A binary model was also tested. The non‐linear model incorporating stem thickness described the data best, indicating that it would be possible to optimize laser cutting by measuring stem thickness before cutting. The general tendency was that more energy was needed the thicker the stem. Energy uses on a field scale are discussed.  相似文献   

Effects of platelet-derived growth factor on DNA and collagen protein synthesis in human vascular fibroblasts     

REN Yu-sheng  WU Zong-gui  CUI Fang  JIA Guo-liang  YU Shi-qing  TANG Chao-wu  LI Bo 《园艺学报》2002,18(11):1377-1380

AIM: To investigate the effects of platelet-derived growth factor on DNA and collagen protein synthesis in human vascular fibroblasts. METHODS: In the present experiment, the human vascular fibroblasts were cultured and effects of platelet-derived growth factor-BB on DNA and collagen protein synthesis in human vascular fibroblasts were observed by using [³H]-TdR incorporation and [³H]-proline incorporation in vitro. RESULTS: Platelet-derived growth factor-BB significantly promoted NDA synthesis and collagen protein synthesis of quiescent human vascular fibroblasts, with a maximal response at a concentration of 30μg·L^-1at 24 h and 36 h, respectively. CONCLUSION: Platelet-derived growth factor-BB promotes DNA and collagen protein synthesis in cultured human vascular fibroblasts.  相似文献   

Effect of 4-chloro-2-methylphenoxyacetic acid and 2,4-dimethylphenol on human erythrocytes     

Bo?ena Bukowska  Katarzyna GoszczyńskaWirgiliusz Duda 《Pesticide biochemistry and physiology》2003,77(3):92-98

The effects of exposure of human erythrocytes to different concentrations of 4-chloro-2-methylphenoxyacetic acid (MCPA) and its metabolite—2,4-dimethylphenol (2,4-DMP) were studied. The investigations concerned mainly the content of glutathione (GSH and GSSG), glutathione peroxidase (GSH-Px), glutathione transferase (GST), and the level of adenine energy charge (AEC). Reactive oxygen species (ROS) such as hydroxyl radical, superoxide anion, hydrogen peroxide, and nitric oxide are produced during normal processes in the cell. Under normal conditions, antioxidant systems of the cell minimize damage caused by ROS. When ROS generation increases to an extent that it overcomes the cellular antioxidant systems, the result is oxidative stress. We observed that MCPA and 2,4-DMP decreased the level of GSH in erythrocytes in comparison with control. MCPA did not affect glutathione peroxidase and glutathione transferase activity, while 2,4-DMP increased their activity. 2,4-DMP decreased the level of ATP and increased the content of ADP and AMP, leading to the fall of the level of AEC. MCPA and 2,4-DMP transform hemoglobin into methemoglobin, thus preventing oxygen transport. Comparison of the toxicity of MCPA and 2,4-DMP revealed that the most prominent changes occurred in human erythrocytes incubated with 2,4-DMP.  相似文献   

南方灭鼠应用稻谷与大米毒饵的比较          下载免费PDF全文

张美文  王勇  李波  陈安国 《植物保护学报》2003,30(1):86-90

生物测定法测得谷壳对复方88-1灭鼠剂的阻滞率为54．3％，光谱分析法测得其对敌鼠钠盐的阻滞率在47．43％—57．00％之间。相同条件下，褐家鼠Rattus norvegicus取食敌鼠钠盐稻谷毒饵量为大米毒饵的2倍多。在南方潮湿的环境下，大米毒饵更易松散、霉变，使其适口性更低。综合考虑认为南方灭鼠使用稻谷毒饵更为合适。  相似文献   

阿魏蘑与杏鲍菇高产优质栽培模式研究   总被引：2，自引：0，他引：2  

万鲁长  张柏松  黄春燕  郭惠东  单洪涛  李斌  姜春君  陈黎明  姚建国 《食用菌学报》2003,10(2):40-44

试验证明，阿魏蘑和杏鲍菇最佳栽培模式为菌棒半脱袋竖向畦栽半覆土栽培模式；最适环境条件为菇房温度13～20℃，空气相对湿度85％～95％；最佳栽培设施为半地下冬暖式塑料大棚。  相似文献   

萝卜离体再生的影响因素   总被引：5，自引：0，他引：5  

武剑  龚义勤  邓波  魏跃  任同辉 《中国蔬菜》2003,1(6):6-8

对影响萝卜离体再生的因素进行了研究,结果表明,不同基困型材料均以带柄子叶的再生频率最高;不同基因型材料所需的最适激素浓度和配比不同,在一定范围内提高6-BA浓度可促进不定芽的分化;苯基脲类细胞分裂素TDZ与嘌呤型细胞分裂素6-BA和KT相比,对促进萝卜不定芽分化的效果更好;AgNO_3可显著提高不定芽再生频率;NAA诱导生根的效果优于IAA。  相似文献