宁夏引黄灌区用水者户协会的发展

宁夏引黄灌区为了加强灌区管理，充分体现农户的参与权、知情权、监督权和管理权，在政府的引导下成立了灌区农民用水者协会。农民参与灌溉管理改革的效果越来越明显。协会在农业用水管理中发挥了积极的作用,使宁夏的灌区逐步走向科学、规范的管理模式。     

缢蛏致病菌气单胞菌的分子生物学鉴定

从患病缢蛏(Sinvnovacula constricta)中分离到一株病原菌,暂命名为12#菌.对该株的16SrDNA的全序列进行PCR扩增并测序,然后用NCBIBLAST对测序结果进行比对.16S rDNA序列分析表明:12#菌与多株气单胞茵的16S rDNA的同源性均在95%vx以上.在细菌系统分类学中应归属于气单胞茵属.从构建的系统发育树中可以看出:12#茵与点状产气单胞茵(Aeromonas punctata)共同构成一个分支,且该菌株与点状产气单胞菌(Aeromonas punctata)的16S rDNA同源性达到99%以上,由此可以初步认为该菌为点状产气单胞茵(Aeromonas punctata).     

Tick salivary gland extract-activated transmission of Borrelia afzelii spirochaetes

Saliva-activated transmission of Borrelia afzelii Canica, Nato, du Merle, Mazie, Baranton et Postic, 1993 was demonstrated using salivary gland extract (SGE) from Ixodes ricinus (L., 1758) ticks and C3H mice. Injection of Borrelia spirochaetes together with SGE increased the level of bacteraemia and accelerated the appearance of bacteria in the urinary bladder, compared with the injection of spirochaetes alone. More I. ricinus nymphs became infected when feeding on mice inoculated with B. afzelii plus SGE. Analysis of cytokines produced by cells of draining lymph nodes from SGE-treated mice showed a suppression of proinflammatory cytokines IFN-gamma, IL-6 and GM-CSF following a transient upregulation in comparison with the control mice infected without SGE.     

Serological Evidence for Borrelia burgdorferi Infection Associated with Clinical Signs in Dairy Cattle in Slovakia

In the course of epizootological research on Lyme borreliosis in domestic and farm animals, the serological evidence for the occurrence of this zoonosis in cattle was screened. An ELISA showed that 25.2% of cattle from seven geographical areas in Slovakia were positive for anti-Borrelia IgG antibodies. In particular localities, the seroprevalence ranged from 0.6% to 34.3%. Of 33 cases with clinical signs, 20 ELISA-positive samples were also confirmed in Western blots. The most frequent clinical signs were lameness and swollen joints, but most of the cases were asymptomatic. The occurrence of Borrelia burgdorferi antibodies and suspected clinical signs in cattle of Slovak regions indicates that veterinarians should pay attention to this disease in their clinical practice and include it within the differential diagnosis.     

可视化仿真技术在施工截流中的应

为提高水利水电工程截流施工过程的施工效率，提出了基于三维图像的可视化仿真方法，利用高效的图形渲染引擎，将仿真结果与可视化系统相结合，为施工系统分析和管理提供了一个有力的工具，为制定合理的施工组织计划提供了科学依据。     

早金香梨抗黑星病鉴定及组织结构与抗病关系研究

对早金香梨新品系进行了人工接种梨黑星病病菌试验,鉴定结果为早金香梨高抗梨黑星病,为以后梨抗病育种和资源利用提供了依据.同时对其叶片组织结构进行了研究,发现早金香梨叶片的栅栏组织为2层、较厚,海绵组织致密,表皮蜡质也较厚,推断这些特性决定了黑星病菌分生孢子不易侵入叶片内部.起到了抵抗黑星病菌的作用,因而早金香梨不易感病,为梨抗黑星病育种提供了理论依据.     

对乙酰氨基酚对大鼠原代肝细胞的损伤机制

胶原酶两步灌流法获取SD大鼠的原代肝细胞,并用不同剂量的对乙酰氨基酚处理.MTT法测定肝细胞的存活率,分光光度法测定培养上清液中乳酸脱氢酶(LDH)的含量.Western blotting法测定大鼠肝细胞中细胞色素P450酶2E1(CYP2E1)的表达水平.结果表明,对乙酰氨基酚可导致肝细胞存活率降低,LDH含量显著升高,CYP2E1表达增加.说明达到一定的剂量时.对乙酰氨基酚可引起肝细胞的损伤.     

上海市城市绿化绿量方程及应用

 该文应用绿量、容量、景观质量（视环境）、使用频率（耐踏率）等绿化评价指标，研究植物群落（种群）空间分布、结构特征与生态效应的关系，探讨了区域范围内生态效应优先，人性空间优先的理论与实践问题，希望通过绿量的探索，寻找植物优化设计，发挥绿化最大综合效益的途径。     

闽南麻竹人工林地上部分现存生物量的研究

The construction of aboveground biomass and biomass model of Dendrocalamus latiflorus plantation in South Fujian are studied in this paper. The results are showed as follows (1)The aboveground biomass and the biomass of culm of D.latiflorus may reliably be calculated by the model, m=a*(D²H）^b,but the biomass of its culm and leaf may not. In order to calculate it, it is necessary to introduce the factor, clear-height,and the models,m=a*D^b(H-h）^c and m=a*D^b*［（H－h）/h］^c. (2)The total aboveground biomass of D.latiflorus plantation in South Fujian is 39.518 t*hm^－2.The biomass of 3-year-old is the highest,accounting for 59.17 percent of the total, followed by that of 2-,4- and 5-year-old successively. The biomass of culm is the highest in terms of organ, accounting for 62.81 percent of the fotal, followed by that of branch and leaf successively. The total aboveground biomass and the biomass of culm gradually decrease along the height, and that of branch and leaf gradually decreases from the section of 6～8 m to the top and to the bottom.     

玉米新品种绵单一号高产高效益综合农艺技术效应模型研究简报

<正> 本研究运用多元二次回归旋转组合设计方法,对我所选育的玉米新品种绵单一号的高产高效益栽培方案,进行了初步研究。以期为大面积推广发挥其最大增产潜力提供科学依据。材料方法试验设置在绵阳市农科所内,土质为涪江冲积土,前作是油菜苗圃地,移栽后冬坑。试验采用二次通用旋转设计,以产量为目标函数,选择密度、纯磷、纯钾为决策变量。其设计水平及线性编码值见表(一): 共设置36个小区,小区面积180平方尺,分三个区组,区组内处理随机排列,育苗于4月2日三叶一心时移栽。100％磷钾肥作底肥一次施用,氮肥分三次施用,40％用于苗肥、杆肥,