生物反应器高密度异培养小球藻

首先用摇瓶实验确定异养流加分批培养小于藻中起始葡萄糖及ＫＮＯ３的适宜浓度与增加葡萄糖及ＫＮＯ３浓度的控制范围和补料中最适Ｃ／Ｎ值,培养其中起始添加１０ｇ．Ｌ＾－１葡萄糖和１．６ｇ．Ｌ＾－１ＫＮＯ３较适宜。在此前提下,流加分批培养时葡萄糖和ＮＯ＾－３质量浓度应分别控制在６．１７－２．４５ｇ．Ｌ＾－１和≤０．４４ｇ．Ｌ＾－１,补料液中最适Ｃ／Ｎ值为４１．２。据此结果,经５Ｌ通风搅拌反应器放大培养实验,     

葡萄糖对异养小球藻利用水体中氮磷的影响

研究了不同质量浓度的葡萄糖对异养小球藻的生长和氮磷利用的影响。实验设计6个添加葡萄糖的质量浓度梯度:0,10,20,30,40,50 mg/L,分别记为C0、C1、C2、C3、C4和C5组,每组3个平行,进行为期16 d的暗培养。实验结果表明:1)葡萄糖的质量浓度显著影响小球藻的生长(P 0. 05),其中C3组小球藻增长最快。2)葡萄糖的质量浓度显著影响小球藻对水体氮的利用(P 0. 05)。培养第3天,C2和C3组水体中氮的质量浓度显著低于其他各组(P 0. 05);第5天,C2、C3和C5组显著低于其他3组(P 0. 05);第8天后,C1～C5各组氮的质量浓度差异不显著,但均显著低于对照组(P 0. 05),其中以C3组氮的质量浓度最低。3)葡萄糖的质量浓度显著影响小球藻对水体磷的利用(P 0. 05)。实验开始第3～5天,C3、C4和C5组磷的浓度显著低于C0、C1和C2组(P 0. 05);在实验进行第8天后,各组磷的浓度变化趋于平缓。实验结果说明添加葡萄糖可以促进异养小球藻的生长,增加异养小球藻对水体氮、磷的利用,其最适葡萄糖的质量浓度为30 mg/L。根据本实验结果推测,小球藻异养8 d后需补充葡萄糖、氮和磷等营养物质,以维持小球藻的持续快速生长。     

透明质酸发酵条件的初步研究

采用兽瘟链球菌 (Streptococcuszooepidemicus)进行发酵生产透明质酸 (hyaluronicacid ,HA) .摇瓶研究表明 :葡萄糖的补加量和补加方式对HA发酵有着较大的影响 ,采用 4 0g·L- 1的初始葡萄糖浓度及维持培养过程 10g·L- 1的糖浓度 ,可使HA的产量达到 4 .0g·L- 1,分子量在 2 .0× 10 6 Da以上 .     

酿酒酵母重组人α2a干扰素补料分批培养

在 2 .6L全自动发酵罐中对人 α2 a干扰素重组酵母的补料分批培养过程作了初步研究。结果表明 ,培养过程中待葡萄糖耗尽时流加葡萄糖 ,并维持低糖浓度 ;在培养 1 0 h～ 2 0 h时 ,恒速流加 2 0 mg/L的腺嘌呤 ,能较大幅度提高表达水平 ,生物活性从原工艺的 3.1× 1 0 9IU/L提高至1 .3× 1 0 10 IU/L。表达期 p H值对生产水平有很大影响 ,宜控制在 5.0～ 5.3     

红豆杉细胞的筛选培养基优化

运用正交试验优化小细胞团法筛选红豆杉细胞系的筛选培养基 .培养基为改良的MS培养基 ,培养基质量浓度为硝酸钾 1 90 0mg·L-1,硝酸铵 82 5mg·L-1,磷酸氢二钾 1 70mg·L-1,蔗糖质量浓度 30 g·L-1,葡萄糖质量浓度 5 g·L-1,并且添加适量的酵母提取物、甘氨酸、维生素C、叶酸、氯化胆碱、泛酸钙等 .该培养基明显提高了细胞生长率 ,并能增加紫杉醇的含量     

透明质酸的发酵调控研究

采用马链球菌 (Streptococcusequi)进行发酵生产透明质酸 (hyaluronicacid ,HA) .5L发酵罐发酵研究表明 :发酵调控对HA的产量和分子量有较大的影响 ,采用 2 0 g·L- 1的初始葡萄糖浓度及维持培养过程 2 0 g·L- 1的糖浓度 ,补加 5 g·L- 1的硫铵 ,采用一定的 pH控制策略可使HA的产量达到 1.0 g·L- 1,分子量在 2 .84× 10 6 Da以上 .     

降低何首乌愈伤组织褐化研究

以何首乌为材料, 叶片愈伤组织为外植体, 采用L9 (34)正交设计, 研究不同因素对降低愈伤组织褐化的作用. 3因素为基本培养基(A)、培养基中活性炭(B)和硝酸银(C)浓度, 每因素设3个水平, A分别为MS, 1/2 MS和1/4 MS无机盐浓度, B分别为0 g·L-1, 5 g·L-1和10 g·L-1, C分别为5 mg·L-1, 0 mg·L-1和10 mg·L-1.外植体接种在不同的MS基本培养基中(含2,4 D 1 mg·L-1、琼脂8 g·L-1、蔗糖25 g·L-1, pH=5 8), 于(25±1) ℃、2 000 lx光照培养, 30 d后统计愈伤组织的褐化率. 试验结果表明: 降低愈伤组织褐化的最优水平组合为A2B3C1, B对试验结果的影响达显著水平(p<0 05). 以1/2 MS为基本培养基, 并于1/2 MS+活性炭10 g·L-1+AgNO3 5 mg·L-1培养基(附含2,4 D 1 mg·L-1)中培养, 褐化率可降至13 9%.     

三种维生素对赤潮异弯藻增殖的影响研究

研究了3种维生素(VB1、VB12、VH)对赤潮异弯藻增增殖的影响,结果表明除了维生素H外,另2种维生素对该藻增殖均有显著促进作用,并存在交互作用;其最适增殖浓度为60μg·L-1维生素B1,0.4μg·L-1维生素B12。文中还对维生素影响微藻增殖的形式提出了新的推测。     

发酵罐葡萄糖流加大规模异养培养小球藻

应用流加工艺在5,50,200,800,4000L机械搅拌发酵罐中大规模异养培养小球藻,与间歇异养或光照自养相比,流加培养大大地提高了细胞密度和生产率,最高细胞质量浓度达到43.31g/L,比生长速率达到0．069h^-1,细胞生产率达到0．62g/(L.h),结果表明,利用传统的机械搅拌发酵罐大规模生产小球有良好的商业化前景。     

怀地黄不定芽诱导生根和微型块茎繁殖的研究

研究了以怀地黄(Rehmannia glutinosa)不定芽诱导生根的适宜培养基以及微型块茎繁殖.结果表明:以IBA2.0mg·L-1+BA0.5 mg·L-1,糖浓度40g·L-1培养基生根效果好,根多、粗壮,移栽后成活率可达98.2％;以IBA2.0mg·L-1+BA2.0mg·L-1+NAA0.2mg·L-1,糖浓度为40g·L-1为诱导微型块茎的最佳培养基.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with