D101树脂分离纯化龙胆草多糖的工艺研究

通过优化龙胆草多糖的纯化工艺,来研究D101大孔吸附树脂对龙胆草多糖的吸附和解析性质。利用水提醇沉法提取龙胆草多糖,考察了各因素对D101树脂吸附解析龙胆草多糖效果的影响,确定了分离龙胆草多糖的最佳分离条件。最佳纯化工艺为:上样浓度为4 g/L,上样流速为2 BV/h,上样量为6 BV,解析流速为2 BV/h,解析体积为7.5 BV,解析液为30%乙醇。在此优化的条件下,D101树脂对龙胆多糖的吸附和解析效果较好。经过纯化后多糖纯度从35.15%提高到了56.24%,多糖的回收率为78.21%。结果表明该法合理可行,可用于纯化龙胆草多糖的富集研究。     

AB-8大孔吸附树脂纯化龙胆多糖的工艺优化

用水提醇沉法提取龙胆粗多糖,优化AB-8大孔吸附树脂纯化龙胆多糖的工艺,并研究各因素对AB-8大孔吸附树脂对龙胆多糖的吸附与解析效果,得到龙胆多糖的最佳纯化工艺条件。最佳纯化工艺为:上样浓度为4 mg/m L,上样流速为4 BV/h,上样量为8 BV,解析流速为1 BV/h,解析体积为225 m L,解析液为30%乙醇。经过纯化后多糖纯度从43.94%提高到了78.63%。经过AB-8大孔吸附树脂的提纯,多糖的纯度提高为原来纯度的1.79倍,所以AB-8大孔吸附树脂可用于纯化龙胆多糖。     

菝葜多糖分离纯化工艺研究

为了优选菝葜多糖的分离纯化工艺,以多糖纯度、多糖出膏率与吸附率等为指标,考察醇沉静置温度、醇沉静置时间与大孔吸附树脂型号等因素,确定菝葜多糖的最佳醇沉工艺与大孔吸附树脂纯化工艺。得到菝葜多糖最佳醇沉工艺为取含生药1.0 g/mL的药液,加入乙醇,使乙醇体积分数达到80%,醇沉1次,室温25 ℃静置12 h,抽滤得醇沉物,70 ℃干燥;纯化工艺为采用AB-8型大孔吸附树脂,用1 BV的2.0 mg/mL(以粗多糖计)的上样液,以2 BV/h的流速上样,再用3 BV的纯水以3 BV/h的流速进行洗脱。结果表明该优选工艺稳定可靠,可用于菝葜多糖的分离纯化。     

鸡血藤中总黄酮的大孔树脂纯化工艺

为了探讨大孔吸附树脂纯化鸡血藤中总黄酮的最佳工艺,通过对6种型号大孔树脂的静态实验,筛选出最佳树脂;考察最佳树脂对鸡血藤总黄酮的吸附及洗脱性能,优化工艺参数.结果表明:HZ820为最佳树脂,其纯化总黄酮的优化工艺条件为上样液质量浓度3.31mg/mL,吸附流速4BV/h(1BV为20mL),上样液体积500mL,树脂吸附量达79.31mg/g;以60%乙醇为洗脱剂,洗脱流速3BV/h,洗脱用量5BV,解吸率达92.72%,减压浓缩得鸡血藤总黄酮浸膏,纯度为79.49%.     

响应面法优选泽兰多糖的大孔吸附树脂纯化工艺

目的:考察8种大孔吸附树脂D3520、H103、HPD-100、HPD-700、AB-8、HPD722、S-8、HPD-600对泽兰多糖的纯化效果,以Box-Behnken法优化最佳大孔吸附树脂的最优纯化工艺.方法:以多糖保留率、脱色率、脱蛋白率的加权综合评分为指标,考察大孔树脂、洗脱流速、上样浓度、洗脱剂用量对纯化结果的影响,通过Box-Behnken设计建立响应面模型来优选大孔树脂泽兰多糖的工艺参数.结果:优选的泽兰多糖的大孔树脂纯化工艺为:取HPD-100大孔吸附树脂,泽兰多糖的上样质量浓度为0.03 g/mL,洗脱流速为1.1 mL/min,洗脱体积为40 mL,以此优选工艺纯化后,多糖保留率69.21%,脱色率60.24%,蛋白脱除率75.67%.结论:泽兰多糖的纯化工艺稳定可靠,HPD-100大孔吸附树脂纯化工艺效果良好,适合工业化生产.     

DM-18型大孔树脂分离纯化新疆沙枣果肉中多糖的工艺

本文研究了DM-18型大孔树脂分离纯化沙枣多糖的工艺条件,考察了各因素对分离、纯化沙枣多糖效果的影响,确定了分离沙枣多糖的最佳分离条件。结果表明:在沙枣多糖样品溶液2.0 mg/mL,上样速率为1.5 BV/h,上样液pH值为7.0,上样量为3.0 BV、洗脱剂乙醇浓度为35%、洗脱剂用量为4.0 BV、洗脱速率为1.0 BV/h时,DM-18型大孔树脂对沙枣多糖的动态吸附率和解吸率分别达到90.13%和92.17%,表明该大孔树脂是一种较好的分离纯化沙枣多糖的材料。     

大孔吸附树脂对莲房黄酮的吸附分离特性研究

选择8种大孔吸附树脂,比较其对莲房黄酮的吸附和解吸附效果.在静态吸附试验的基础上,筛选出AB-8树脂进行动态吸附试验.实验结果表明,大孔吸附树脂AB-8对莲房黄酮的最佳层析条件为:样液总黄酮液浓度为1.5mg·mL-1,上样流速3BV/h,调节样液pH为3.5上样,以70％的乙醇浓度洗脱,洗脱流速2BV/h.     

大孔吸附树脂对莲房黄酮的吸附分离特性研究

选择8种大孔吸附树脂,比较其对莲房黄酮的吸附和解吸附效果。在静态吸附试验的基础上,筛选出AB-8树脂进行动态吸附试验。实验结果表明,大孔吸附树脂AB-8对莲房黄酮的最佳层析条件为:样液总黄酮液浓度为1.5mg.mL-1,上样流速3BV/h,调节样液pH为3.5上样,以70%的乙醇浓度洗脱,洗脱流速2BV/h。     

刺五加中刺五加总苷的大孔树脂工艺精制研究

目的：筛选刺五加总苷的大孔树脂纯化工艺。方法：以紫丁香苷为对照,采用分光光度法,通过刺五加总苷对5种大孔树脂的静态吸附及解析效果考察,筛选出适合纯化刺五加总苷的大孔树脂,进而通过动态吸附及解析的条件对纯化刺五加总苷的工艺进行优化。结果：D-101型大孔树脂适合纯化刺五加总苷,优化后的最佳富集工艺条件为：上样液质量浓度为0.3 g·ml-1,上样量为50 ml/10 g树脂,依次用7倍树脂体积量水及75%乙醇进行洗脱,浓缩干燥乙醇洗脱液,得刺五加总苷。刺五加总苷转移率达60%以上。结论：本方法适合刺五加总苷的富集。     

大孔树脂分离纯化中药复方多糖的工艺研究

对AB-8型大孔树脂分离纯化中药复方免疫增强剂中多糖的工艺条件进行研究,采用苯酚-硫酸法测定大孔树脂对分离纯化多糖的吸附率、解吸率及影响因素。结果显示:最佳工艺条件为上样液药复方多糖的浓度为5.93mg/mL、速率2BV/h、体积2BV,洗脱液乙醇的体积浓度为50%、速率3BV/h、用量3BV。AB-8型大孔树脂的吸附率、解吸率分别达到71.0%、93.1%,所得多糖含量为79.8%,表明AB-8型大孔树脂对中药复方多糖有较好的分离纯化性能。     

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.     

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.     

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.     

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.