抗菌药物对布鲁氏菌体外最低抑菌浓度研究

目的:测定临床常用抗菌药物及新型抗菌药物对布鲁氏菌的最低抑菌浓度(MIC),以确定布鲁氏菌对各种抗菌药物的敏感性,为后期布鲁氏菌耐药性研究及布鲁氏菌病临床用药研究奠定基础.方法:采用美国临床实验室标准化协会(CLSI)规定的肉汤稀释法对布氏杆菌活疫苗S2株进行抗菌药物的MIC检测.结果各种药物的MIC值分别为:硫酸庆大霉素0.470μg/mL,硫酸卡那霉素1.362μg/mL,利福平1.821μg/mL,硫酸链霉素1.700μg/mL,四环素2.710μg/mL,莫西沙星0.298μg/mL.结论与其余5种药物相比,第4代喹诺酮类药物莫西沙星的MIC值最低,抑制布鲁氏菌生长能力最强.氨基糖苷类抗菌药物中,硫酸庆大霉素的MIC值最低,硫酸链霉素的MIC值最高.     

复方黄柏颗粒对养殖场常见致病菌的体外抑菌实验

本研究的目的是为了探讨新型复方中兽药复方黄柏颗粒对养殖场中常见致病菌的体外抑菌效果,结果表明:复方黄柏颗粒对金黄色葡萄球菌、大肠杆菌、嗜水气单胞菌、甲型副伤寒沙门氏菌和多杀性巴氏杆菌的最小抑菌浓度(MIC)分别为15.625 μg/mL、125μg/mL、125μg/mL、31.25μg/mL、62.5μg/mL,最小杀菌浓度(MBC)分别为＞1000μg/mL、250μg/mL、250μg/mL、250μg/mL、1000μg/mL,抑菌圈直径呈浓度依赖关系,与MIC结果基本吻合.复方黄柏颗粒具有明显的抑菌效果,同时也为其使用提供了理论依据.     

流动注射在线分离富集-火焰原子吸收光谱法用于Cr(Ⅲ)和Cr(Ⅵ)的形态分析

在单阀流动注射系统中 ,分别以串联在阀体流路中的阴、阳离子交换树脂微型柱分离富集 ,两种洗脱剂逆向洗脱 ,实现了Cr(Ⅲ )和Cr(Ⅵ )的在线分离富集和火焰原子吸收光谱法同时测定 .当富集 2min时 ,分析速度为 1 8样 /h ,测定Cr(Ⅲ )和Cr(Ⅵ )的特征浓度分别为 1 0 .1 2 μg/L和 1 4.43μg/L ( 1 %吸收 ) ,线性范围分别为0～ 1 0 μg/mL和 0～ 1 5 μg/mL ,对浓度分别为 1 μg/mL的Cr(Ⅲ )和Cr(Ⅵ )测定的相对标准偏差分别为 1 .6 2 %和 3.94% .该法应用于实际水样分析 ,加标回收率在90 .9%～ 1 0 4 5 %之间 .     

两种海洋寡糖对双歧杆菌体外生长作用的影响

壳寡糖、褐藻寡糖是具有独特生理活性的功能性海洋寡糖。以壳寡糖、褐藻寡糖分别代替葡萄糖作为培养基的碳源,观察双歧杆菌在体外生长的情况,比较分析2种寡糖对双歧杆菌生长的作用效果。结果表明：2种寡糖可使双歧杆菌大量增殖,对双歧杆菌体外生长有显著的促生长作用,且作用效果明显优于葡萄糖。褐藻寡糖在2.5~1.25 g.L-1范围内,作用变化幅度较小;而壳寡糖则表现为高浓度优于低浓度。培养基中添加壳寡糖的最佳质量浓度为1.25 g.L-1,添加褐藻寡糖的最佳质量浓度为0.625 g.L-1。     

异长叶烷基噻唑类化合物的合成及其生物活性

【目的】将噻唑环构建至异长叶烷酮分子中,得到具有新型生物活性化合物,拓展松节油的应用领域,提高松节油的利用价值。【方法】异长叶烷酮与氨基硫脲缩合,生成异长叶烷酮缩氨基硫脲; 异长叶烷酮缩氨基硫脲再与α-溴代苯乙酮衍生物发生环化反应,得到11种异长叶烷基噻唑类化合物2a—2k。采用FT-IR、¹H NMR、¹³C NMR、HPLC-MS等手段,对合成产物的结构进行了表征。采用最低抑制浓度(MIC)法和MTT法分别研究了异长叶烷基噻唑类化合物的抑菌活性和抗肿瘤活性。【结果】化合物4-(4-氯苯基)-2-(2-(1,1,5,5)-四甲基四氢-1H-2,4α-桥亚甲基萘-8(2H,5H,8αH)-亚基)肼基)噻唑(2b)和4-(2-萘基)-2-(2-(1,1,5,5)-四甲基四氢-1H-2,4α-桥亚甲基萘-8(2H,5H,8αH)-亚基)肼基)噻唑(2j)对枯草芽孢杆菌与荧光假单胞菌抑制效果较好,其最低抑制浓度(MIC)为7.5 μg/mL,化合物2b对真菌(白色念球菌与热带假丝酵母菌)的抑制效果优于其他化合物,其MIC值均为15.6 μg/mL; 异长叶烷酮缩氨基硫脲对人体肝癌细胞HepG2 的半抑制浓度(IC₅₀)为(34.5±0.8)μg/mL,表明其对HepG2具有较好的抗癌活性。【结论】异长叶烷酮缩氨基硫脲可作为潜在的抗肿瘤药物。     

Co2+/GO复合材料的合成与抑菌性能

在体积比为4/3的乙醇/甲酰胺混合溶剂中,利用氧化石墨(GO)与氯化钴反应得到了Co2+/GO复合材料.采用XRD、FT-IR、SEM、EDS及TG-DTA等对复合材料的结构进行表征,结果表明Co2+/GO复合材料具有层状结构,Co2+与氧化石墨片层上的氧原子形成了配位键,复合材料对枯草芽孢杆菌具有明显的的抗菌活性,对枯草芽孢杆菌和大肠杆菌的最小抗菌浓度(MIC)分别为7.5μg/mL和6.25μg/mL.     

铑(Ⅲ)一高碘酸钾一偶氮胭脂红B催化光度法测定痕量铑的研究与应用

在硫酸和热水浴中 ,Rh(Ⅲ )催化高碘酸钾氧化偶氮胭脂红B褪色 ,由此建立了测定铑的新催化光度法 .铑质量浓度在 0～ 1 1μg/2 5mL范围内符合比尔定律 ,检出限为 4 0 8× 10 - 9g/mL .对 1 0 μg/2 5mLRh(Ⅲ )测定的相对标准偏差为 2 2 0 % (n =11) .催化反应的表观活化能为 10 0 38 KJ/mol.考察了 4 0多种共存离子的影响 ,Os(IV)、Ru(Ⅲ )和Ir(IV)干扰 ,其它贵金属、有色金属和铁不干扰 .题示体系已用于某些催化剂和冶金产品中痕量铑的测定 ,结果满意 .     

抗生素JI-20A分批发酵过程动力学研究

在抗生素JI - 2 0A分批发酵过程中 ,对数生长期最大 μx 可达 0 .0 5 8h- 1 ,最大Qst 约 3.91mg (mL·h) ,最大Es 为 2 2 .6 9U ;产物合成期Qp 最大可达 5 9.19μg (mL·h) ,μx ≤ 0 .0 2 2h- 1 ,Qst 约 0 .8～ 1.6mg (mL·h) .分别建立了菌体生长阶段和产物合成阶段的动力学模型 ,进行了模型参数的估计和回归 ,模型拟合偏差平方和≤ 5 %.     

CTAB包被的不同形态纳米金的制备及其抗菌性能研究

本文以CTAB为包被试剂合成了球形、棒状和三角形三种不同形态的纳米金颗粒,研究了它们对金黄色葡萄球菌(Staphylococcusaureus,S.aureus)和大肠杆菌(Escherichiacoli,E.coli)杀菌性能的差异.通过平板计数法和浊度法;确定了它们对两种菌的最小杀菌浓度(minimum bactericidal concentrations,MBC)和最小抑菌浓度(minimum inhibitory concentrations,MIC).棒状纳米金、三角形纳米金、球形纳米金对大肠杆菌的MIC分别为0.65μg/mL、3.71μg/mL、21.21μg/mL,MBC分别为1.30μg/mL、11.09μg/mL、21.21μg/mL;对金黄色葡萄球菌的MIC分别为0.26μg/mL、0.56μg/mL、2.65μg/mL,MBC分别为0.52μg/mL、1.11μg/mL、2.65μg/mL.结果表明无论是对大肠杆菌还是金黄色葡萄球菌,棒状纳米金的杀菌效果均高于其它两种形态,并且三种不同形态的纳米金对金黄色葡萄球菌的杀菌效果均优于大肠杆菌.     

海洋真菌Fusarium sp.#ZZF51的次级代谢产物二(5-丁基-2-吡啶甲酸-N1,O2)合铜(II)的抑菌抗癌活性研究

从南海红树林内源真菌Fusarium sp.#ZZF51的培养液中分离得到一金属铜络合物(1),通过波谱数据和单晶衍射数据解析其结构为:二(5-丁基-2-吡啶甲酸-N1,O2)合铜(Ⅱ),它是首次从自然界中被发现.体外活性实验初步表明:络合物(1)对四种细菌(金黄色葡萄球菌、枯草芽孢杆菌、大肠埃希氏菌和肠炎沙门氏菌)和三种癌细胞(KB、KBv200、HepG2)具有较强抑制活性,前者最低抑菌浓度(MIC值)分别为12.5、25、12.5和50 μg/mL,后者IC50值分别为3.54、3.68和25.12 μg/mL.     

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-