景观树种红叶石楠的组织培养

针对景观树种红叶石楠的组织培养的各个环节进行试验性研究．结果表明：红叶石楠表面灭菌以二次灭菌4＋3．5min较好，成活率达85％，启动培养基以MS＋6-BA1．0mg／L＋NAA0．2mg／L较好，分化率达100％．适宜的增殖培养基为MS＋6-BA2．0mg／L＋NAA0．1mg/L，增殖系数为7．2，适宜生根培养基为...     

高效液相色谱分析阿维菌素（AVM）乳浊液中有效成分B1a和B1b

阿维菌素(Avermectin，AVM)是一种新型大环内酯类广谱抗寄生虫药物，在我国广为应用。实验采用Dionex高效液相色谱仪对阿维菌素乳浊液进行分离，紫外检测器检测，结果表明AVMB1a和AVMBlb能与其他干扰峰较好地分离，其中AVMBla在5～250mg／L的浓度范围内呈良好的线性关系，回收率为98．8％～100．5％，时间精密度为0．73％，峰面积精密度为0．31％，得到较好的分析结果。     

实验室常用消毒剂杀菌效果研究

通过对目前实验室常用的消毒剂抑菌作用的比较实验．确定了过氧乙酸为实验室抑菌效果较好的消毒剂,实验结果显示，用含0．03％过氧乙酸消毒剂溶液对大肠杆菌作用1min，对金黄色葡萄球菌作用1min，杀菌率为100％.用古0．04％过氧乙酸消毒荆作用10min．室内台面自然菌比对照组减少94．21％．     

磷酸盐对糖姜片的护色作用研究

以三种磷酸盐为主对姜片进行护色处理替代传统的亚硫酸盐护色工艺，经研究表明，三种磷酸盐均有一定的护色效果，其护色作用受溶液的pH值的影响，以pH值为4．5-5．5时，效果较好．经0．10％柠檬酸-0．20％磷酸盐护色处理，其中以柠檬酸与六偏磷酸钠复合处理有加和作用．而氯化钙对磷酸盐的护色效果有负作用．为此推荐以两倍量的0．10％柠檬酸-0．20％六偏磷酸钠溶液热烫姜片10min后再浸泡2h作护色处理，制得的无硫糖姜片的感官质量较好．这为广大消费者提供不含硫，食用安全性高的传统美食提出了一条可行的途径。     

重组拖丝蛋白基因在大肠杆菌中表达条件的优化

对巳构建的重组蜘蛛拖丝蛋白基因表达菌株pNS2，以IPTG为诱导剂，建立最适表达条件．在LB培养基中添加质量分数为0．1％的甘氨酸和丙氨酸，菌体培养至密度A600＝0.5—0．7时加入浓度为0．2mmol/L的IPTG，诱导5h，可得到表达量占可溶性总蛋白质27．2％的较好结果．     

用天然粉石英配制熔模铸造面层涂料

粉石英SiO2含量高(98．7％—99．3％)，Fe2O3含量低(0．03％—0．04％)，价格约为人工石英粉的一半，用它和水玻璃配制的面层料涂片重量较轻(0．47—0．52g)，铸件表面粗糙度Rz＞40μm。经过对天然粉石英的淘洗工艺和颗粒组成的反复研究，做了大量的工艺试验，最后确定了一种性能较好的粉料。可使涂片重达到0．8g以上，铸件的粗糙度也得到了改善(Rz为13．9—24．65μm)。     

不同前灭菌处理及激素组成对文心兰花梗组织培养的影响

以薄叶系文心兰Aloha‘1wanaga’的花梗为外植体，探讨了不同前灭菌处理及激素组成对文心兰花梗组织培养的影响。结果表明：70％的乙醇、浸渍10秒的前灭菌处理效果较好；激素组合以BA0．11、NAA0．19和BA0．23、NAA0．37两个组合比较好，其生存率分别达到了54％和40％。     

丰产宝在棉花新品种上的应用试验初报

通过1997年丰产宝在棉花新品种上的应用试验，证明喷施丰产宝能使棉花新品种的平均单株成铃数增加0．7─1．0个，铃重增加0．47—0．91g，衣分率提高2．6％—3．7％。从而增产效果显著，有较好的推广利用前景。     

间接紫外吸光光度法测定蔬菜中Vc含量

用I3^-间接紫外吸光光度法测定了11种蔬菜中的Vc含量，并进行了重复实验和回收实验。结果：Vc含量在0．116—0．872mmol／kg之间；重复实验的CV在0．38％--8．31％之间；回收率在92．05％--107．09％之间。该方法的准确度较好，且方法简便，灵敏度可达0．025mmol/kg，可用于新鲜蔬菜中Vc的快速、简易测定。     

壳聚糖预处理对沉水植物黑藻生长的影响

以黑藻为例，研究了壳聚糖对沉水植物黑藻生长的影响，随机选取了经驯化培养后的黑藻顶枝，分别植入壳聚糖浓度为0％、0．05％、0．1％和0．2％的Hogland溶液中，进行生长实验，结果显示壳聚糖能促进黑藻生长，增加株高和湿重，同时能促进根的生长，并且以0．1％浓度的壳聚糖培养液效果最好，壳聚糖还能促进叶绿素的合成，并且0．05％、0．1％浓度的效果较好．另将经不同浓度壳聚糖预处理后的植株置于黑白瓶中，进行了壳聚糖影响黑藻光合能力的实验，结果显示经0．1％浓度的壳聚糖预处理24h后，能显著提高总产氧量和净产氧量。总之，用适宜浓度的壳聚糖溶液培养或对沉水植物黑藻进行预处理，能促进植株和根的生长发育，增加植株的光合能力，促进叶绿素的合成，提示在进行湖泊生态修复过程中，可利用适宜浓度的壳聚糖进行育苗，适当加快沉水植物育苗周期，提高湖泊沉水植物恢复的效率和效果。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-