生物流化床固定化光合细菌处理含酚废水试验

在本实验室自行研制的生物流化床中用海藻酸钠-壳聚糖-活性炭微胶囊对光合细菌进行固定,以pH、培养温度、接种量和含酚废水浓度为影响因素,以苯酚和CODCr去除率为检测指标,比较固定化光合细菌和游离态光合细菌对含酚废水的处理效果.结果表明,在生物流化床中,固定化光合细菌处理含酚废水效果优于游离态光合细菌.进一步的正交试验结果表明:影响固定化光合细菌处理含酚废水的各因素的主次关系分别为:温度>pH>接种量.在20 L生物流化床中处理7 d后,其最佳处理条件是温度为30 ℃,pH值为7.0,接种量为15 000颗,此时废水中苯酚去除率高达91.7%.     

光合细菌固定化及其对铜绿微囊藻的抑制

为探讨光合细菌固定化后对铜绿微囊藻的抑制作用,比较了光合细菌的5种不同固定化方法及其特性,确定了最佳的固定化方法;在实验室条件下进行菌藻共同培养,通过试验研究了固定化后的光合细菌与游离光合细菌对铜绿微囊藻生长的影响差异并确定了固定化光合细菌的最佳投加量。结果表明：采用沸石、碳酸钙和海藻酸钠混合包埋光合细菌的固定化方法最佳;固定化光合细菌对铜绿微囊藻抑制作用显著,为83.55%,而相同量的游离光合细菌的抑制作用只有26.81%;最佳固定化光合细菌投加量为36 g / L。     

光合细菌的分离鉴定及其对废水净化效果研究

为筛选能够高效净化当地废水的光合细菌,采用双层平板法,从宜宾当地废水中分离得到1株光合细菌,将其命名为YBX-1,并对该菌株进行形态学和生理生化实验,鉴定为红色假单胞菌.该菌株的最适生长条件为:45 W的白炽灯为光源,pH值为6.0~6.5,接种量为15%~20%.该菌株对宜宾本地3种废水的净化能力与外购对照菌株相当,最高CODCr去除率可以达到63.2%,具有潜在的应用价值.     

光合细菌肥料对植物的影响

光合细菌作为生物肥料 ,在农业上具有独特的功效和广泛的适应性。本文选用 9株光合细菌的混合培养物 ,观察了其对植物光代谢和水分代谢的影响。结果表明 :光合细菌可使菠菜叶绿素含量提高 1 0 .55 % ,CO2 吸收率提高 9.1 6 % ,光合强度增加 33 % ,二磷酸核酮糖羧化酶活性提高 38% ,明显加强了植物的光合作用 ,同时 ,光合细菌使植物地下部分含水量降低 3 .8% ,地上部分含水量增加 2 .5 % ,根系重量增加 6 .9% ,明显增加了植物对水分的吸收和分布     

用光合细菌处理高浓度有机废水的研究

本文介绍了从豆制品废水流经的底泥中筛选出的PSB“1”号菌株,用它和荚膜红假单胞菌混合后具有高效降解能力;提出了以这两个菌株为主的菌群来处理高浓度有机废水的新工艺;并从光合细菌动力学和基质降解动力学的角度分析了工艺的合理性。试验结果表明,经PSB三级处理后,废水的BOD去除率为97%以上。再经氧化槽处理,水质便达到排放标准。此外,从处理过的水中回收到的菌体富含蛋白质和维生素,这为光合细菌在生态工程中的综合利用开辟了广阔前景。     

固定化光合细菌在厌氧折流板反应器中处理有机废水的试验研究

本文进行了光合细菌（ＰＳＢ）的富集、分离、纯化和鉴定，并研制了一种新的固定化细胞方法──半透膜包埋法，将其应用于厌氧折流板反应器中对高浓度工业有机废水进行了处理。处理的试验结果表明，固定化光合细菌厌氧折流板反应器对有机废水保持较高的处理效率。     

用于煤气废水深度处理的脱酚菌的特性

从哈尔滨某气化厂生化处理系统的活性污泥中筛选出2株高效脱酚菌.经过生理生化鉴定和16SrDNA测序,鉴定2株菌分别属于芽孢杆菌属(Bacillus)和假单胞菌属(Pseudomonas).研究了温度、pH对单一高效脱酚菌和混合菌脱酚能力的影响及其菌胶团形成能力.结果表明:混合菌脱酚能力和菌胶团形成能力高于单一菌种,对温度、pH的适应性也比单一菌种强,更适合作为实施生物增强的菌剂.将混合菌固定在活性炭上,形成固定化生物活性炭(IBAC)处理煤气废水,对COD和总酚的去除率可以分别达到80%和70%以上.     

煤系硅藻土-海藻酸钙协同固定化光合细菌去除废水氮磷实验

以煤系硅藻土和海藻酸钙为复合载体材料,采用微流控方法,通过煤系硅藻土的亚微米连通多孔结构和海藻酸钙三维凝胶网络结构的协同作用,将光合细菌的沼泽红假单胞菌固定化,以提高固定化光合细菌去除废水氮磷的降解效能。选取化学需氧量(COD)、氨氮(NH_3-N)和总磷(TP)为污水的定量分析指标,探讨温度、光照强度、投放频率和投放量等环境因素对复合固定化光合细菌颗粒处理污水中氮磷的去除效能的影响。实验结果表明,煤系硅藻土-海藻酸钙协同固定化光合细菌去除废水氮磷的最优实验工艺条件为:温度30℃,光照强度为30×10~3lx,投加频率1/2 d~(-1),投加量20 g·L~(-1)。当复合固化颗粒处理废水6 d后,对废水氮磷的COD,NH_3-N和TP的去除率分别达到78.2%,78.7%和79.8%。     

高效木质素降解菌的筛选及降解性能研究

【目的】筛选纯化及鉴定木质素降解菌,对其降解性能进行初步研究。【方法】从某制浆造纸厂的造纸废水污泥中,筛选获得2株具有木质素降解能力的细菌LD-1和LD-2。通过形态观察和16SrRNA序列分析对菌株进行鉴定;采用苯胺蓝平板脱色法及以TC为指标分别定性定量测定2株细菌的木质素降解能力。【结果】LD-1和LD-2分别被鉴定为Sphingobacterium属和Bacillus属的菌株,命名为Sphingobacterium sp.LD-1和Bacillus sp.LD-2。通过苯胺蓝平板脱色实验,发现LD-1和LD-2均具有良好的木质素降解能力。经测定,两株菌种发酵7d对木质素的降解率分别达到52.23%和50.36%。【结论】成功筛选到2株能高效降解木质素的菌株LD-1和LD-2。     

高效选育产氢光合细菌的研究

降解有机废水转化太阳能为氢能是一条理想制氢途径 .为使选育的菌株实用性更强 ,本文选用有机废水主要降解产物—乙酸为唯一氢供体 ,在自然生态环境条件下 ,利用紫色非硫细菌培养基 ,紫色硫细菌培养基和绿硫细菌培养基 ,从不同的水域环境中进行了产氢光合细菌的筛选 .从影响太阳能转化效率主要因素出发 ,本文对分离纯化的 1 5株光合细菌进行形态学特征研究基础上 ,着重进行了最适生长温度、光合色素成分、利用硫化物能力和耐盐能力的测定 ,并将其分为 4个类群 .在对每组细菌初筛基础上 ,本文对选育出的 8个菌株进行了生长动力学测定 ,其中Z ,SP2 ,R3,Y7菌株能利用乙酸快速生长 .对其产氢动力学研究表明 ,这些菌株均具有光合放氢活性 ,其中Z菌株产氢得率最高 .在含有 2 0mmol·L-1 乙酸钠和 5mmol·L-1 谷氨酸钠的培养基中 ,其产氢得率为 3 0 8.9ml·g-1 .这 4个菌株生理生态特性完全不同 ,且能利用乙酸光合放氢 ,在有机废水光合制氢技术中具有重要的潜在应用价值 .     

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.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of