落叶松人工林林分径级结构的研究

本文描述了落叶松人工林抚育后径级结构特征。试验表明，抚育后的林分在一定密度条件下，其密度遵从Ｗｅｉｂｕｌｌ分布，并能保持相当长的时间不变；其密度较大，Ｗｅｉｂｕｌｌ参数值在２～３间变动，ｂ值在６～８间变动；稀疏时不能用Ｗｅｉｂｕｌｌ分布模拟。     

柑橘园产量等级界定模式的建立

由专家群体对不同品种、种植密度、树龄、产量进行柑橘园产量等级经验评估,应用回归方法筛选出柑橘园产量等级的统一量化模式,为相关应用研究提供可比参考指标.     

落桦混交林幼龄期Ⅰ级木分布规律研究

利用３６块落叶松一样树混交林标准地调查资料，研究其幼龄期林分Ⅰ级木单位面积株数与林分密度之间的关系，结果表明：Ⅰ级木的株数并非随密度的增加而直线递增，而是趋向“二阶常数”分布，且在同一年龄阶段，在较低的密度范围（２３２５～４８００株／ｈｍ２）或较高的密度范围（４８０１～６７５０株／ｈｍ２）．Ⅰ级木的株数变动幅度不太大。     

甘薯新品种综合评价初探

对福建省新育成甘薯品种应用灰色加权关联度分析法进行综合评估，旨在鉴定新品种在丘陵旱地的适应性以及探讨出一种比较适宜的品种评估方法。结果表明，龙薯1号、莆薯41和泉薯647比较适应东南沿海丘陵旱地生产条件，评估结果与品种的实际表现比较一致。     

湖北省分地区水灾损失等级划分初探

建立了湖北省分地区水灾损失灾度等级的划分标准。基于模糊模式识别理论，按最大隶属原则和择近原则对灾度等级进行了模糊综合评判。     

Selection and amplification of the liver stem cell subset from rat bone marrow cells with a medium containing cholestatic serum in vitro

AIM: To explore the feasibility of direct separat and selective enlargement of the bone marrow-derived liver stem cells (BDLSC) from bone marrow cells with a culture system containing cholestatic serum in vitro. METHODS: Bone marrow cells of rats were cultured with selective media containing 2%, 5%, 7% and 10% cholestatic rat serum, respectively. The BDLSC were then induced to proliferate with the addition of hepatocyte growth factor (HGF) on the firth day. BDLSC were characterized using immunocytochemistry and RT-PCR for lineage markers, glycogen staining and urea synthetic assay for functions 2 weeks later. RESULTS: Bone marrow cells were unble to form colony in the presence of 2% cholestatic serum and apopotosis appeared gradually in 7% or 10% cholestatic serum. The BDLSC survived in the medium containing 5% cholestatic serum while the other types of cells did not. The survival cells proliferated with a high speed during the second week and then formed hepatocyte-like colony-forming units (H-CFU). Cells in the H-CFU expressed the characteristic proteins of fetal hepatocytes. Furthermore, they had glycogen storage and urea synthesis functions, two of the critical features of hepatocytes. CONCLUSION: The selective micro-environment effectively selected BDLSC from the bone marrow cell, and will be a new way to provide an abundant source of donor hepatocytes for clinical cell therapy.     

湖南猪致病性大肠杆菌的分离及药物敏感性监测

从湖南47个规模化猪场发生典型仔猪黄、白痢猪只的63份腹泻病猪分离出63株大肠杆菌，其中12株作致病力试验均有致病性，对25种抗菌药物药敏试验，大肠杆菌对胺卡那霉素和头孢唑啉敏感，敏感菌株分别占98．41％和92．06％；多种抗生素产生耐药性，且为多重耐药。     

几种绵羊常用粗饲料GI的测定及其代谢能模型化研究

在测定5类9种粗饲料及3个混合粗饲料的常规成分基础上,实测了它们的粗饲料分级指数(GI):大青山草地早熟禾3.4758、沙打旺3.3731、苜蓿1.7202、混粗C21.1797、青干草1.1029、混粗C10.7852、羊草0.5684、玉米青贮0.4152、玉米秸0.1985、谷草0.1728、混粗D0.0805、苏丹草0.0687,并就GI与饲料相对值(RFV)对粗饲料品质的分级进行了比较,表明GI要优于RFV,同时证明:GI还可以用于混合粗饲料的优化与牧草刈割期的确定。研究并建立了预测粗饲料代谢能(ME)的模型:ME(MJ/kg)=-11.7492 0.5959IVDM(D%)-0.0044[IVDM(D%)]2,其中IVDMD为体外干物质消化率。     

TFSQ型高效环保组合式粮食杂质清理筛的研制

通过对振动筛理、垂直风选、旋风分离与沉降系统的研究,研制出集振动筛理、风选、旋风分离沉降、含尘气流循环再利用为一体的TFSQ型高效环保组合式粮食杂质清理筛。经应用测试和专家鉴定:该设备具有清理效率高、清理过程粉尘污染小,使用维护方便、可靠性强等优点,具有广阔的市场推广前景。