悬浮培养红豆杉细胞中影响细胞生长和紫杉醇产量若干因？…

综述了悬浮培养红豆杉细胞生长状态、植物生长调节因子、糖分、氨基酸、无机盐、ｐＨ值及光照等因素对细胞悬浮培养生产紫杉醇的作用,为探索生产紫杉醇的最适条件和大规模细胞培养（生产紫杉醇）提供理论依据。     

细胞培养技术的进展

本文介绍了细胞培养技术在动植物细胞的大量培养、“工程菌株”的培养、固定化增殖细胞的培养及具有分离装置的培养等方面取得的新进展。     

柴胡细胞悬浮培养

柴胡愈伤组织的诱导以适当浓度的２，４－Ｄ和细胞分裂素的配合使用效果较好。在细胞悬浮培养过程中，细胞生长的情况是接种后的９￣１８天迅速生长，１８天后基本停止生长；ｐＨ值随培养的进程由开始时的５．８逐渐降至４．９（第９天），然后又出现回升。对培养液的检测表明：未分化出根的柴胡培养细胞也能生成柴胡皂甙。     

唐古特大黄细胞悬浮培养中的生理生化特性

目的 初步研究液体培养条件下唐古特大黄(Rheum tanguticum Maxim.ex Balf.)细胞的生理生化特性.方法 以唐古特大黄子叶为材料,诱导和筛选愈伤组织,进行细胞悬浮培养.测定了细胞悬浮培养过程中的细胞生长、pH值和总蒽醌累积的动态变化,并研究了水杨酸(SA)对细胞生长和总蒽醌累积的影响.结果 培养细胞生长周期36d;细胞的增殖曲线呈"S"形;其培养液pH值先下降后回升;细胞中总蒽醌累积规律也呈"S"形曲线,在培养的第30天,细胞中总蒽醌可达到最大值.SA对细胞的生长和总蒽醌累积有影响,0.1mg/L和1.0mg/L SA促进细胞的生长和总蒽醌的积累.结论 细胞悬浮培养过程中的总蒽醌累积和细胞生长呈正相关性.     

培养原代小鼠组织细胞检验细胞实验室技术操作规程

目的通过培养小鼠原代组织细胞,检验本科室己建立的一套细胞实验室技术操作规程能否满足细胞培养要求。方法培养小鼠原代成骨细胞、软骨细胞、心肌细胞、肝细胞、肺部细胞、脑部细胞、骨髓间充质细胞和胚胎成纤维细胞。计算原代培养成活率、传代成活率、冷冻及复苏成活率。结果成骨细胞、软骨细胞、心肌细胞、肝细胞、肺部细胞、脑部细胞、骨髓间充质细胞、胚胎成纤维细胞原代培养成活率分别为89%、96%、100%、100%、100%、80%、100%和90%;传代成活率分别为76%、93%、100%、92%、100%、66%、80%和92%;冷冻及复苏成活率分别为100%、100%、100%、100%、100%、100%、100%和100%。结论通过计算KM小鼠8种组织细胞原代培养、传代、冷冻与复苏的成活率,证明现有的细胞室技术操作规程基本上能够保证成功培养出常规原代细胞,并能传代、冷冻和复苏。     

大鼠胰岛β细胞原代培养的一种实用方法

以Ｖ型胶原酶分离胰腺得到胰岛，在ＥＧＴＡ预处孵育后以低浓度的胰蛋白酶和ＤＮａｓｅⅠ酶联用消化胰岛建立了大鼠胰腺β细胞的分离及原代培养方法。     

悬浮培养红豆杉细胞中影响细胞生长和紫杉醇产量若干因素的研究进展

综述了悬浮培养红豆杉细胞生长状态、植物生长调节因子、糖分、氨基酸、无机盐、ｐ Ｈ值及光照等因素对细胞悬浮培养生产紫杉醇的作用,为探索生产紫杉醇的最适条件和大规模细胞培养（生产紫杉醇）提供理论依据     

电导率法监测红豆杉细胞的生长

对红豆杉细胞在２５０ｍＬ和２Ｌ摇瓶及１０Ｌ反应器中的生长情况进行了研究。应用电导率法监测红豆杉细胞的生长,得出在红豆杉细胞悬浮培养的细胞生物与培养液电导率变化的相关性。     

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.     

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.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

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

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.