山葡萄五味果汁中成分及总能量的测定

根据国标及相关文献对山葡萄五味果汁中的总糖含量、蛋白含量、维生素含量及总能量分别进行了测定,明确了山葡萄五味果汁的营养成分,分别测出其糖的含量为7.16g/100mL,蛋白的含量为0.00g／100mL维生素C的含量为8.08mg/100mL,维生素B1的含量为0.31mg/100mL,并计算出每100mL饮品的能量为150.48KJ/100mL.为消费者了解该果汁饮品的成分提供了科学的参考.     

β-NGF融合蛋白的表达及其三步层析纯化工艺

采用无血清培养基培养表达HIR-β-NGF融合蛋白的工程细胞株CHO,收集上清后,通过浓缩、过滤预处理,并采用亲和层析、阴离子交换层析和阳离子交换层析三步法工艺对融合蛋白进行纯化,最后用Fc ELISA、CHOP ELISA、Western-blot等方法对目的蛋白进行质量检测.实验结果表明:HIR-β-NGF融合蛋白相对分子质量约为190kDa;蛋白收率达47.0%;经纯化后杂质DNA含量可降低到2.3 ng/mg以下,CHOP蛋白降到2.3 ng/mg以下,Protein A蛋白降低到49.8 ng/mg;产物仅有3.51%发生聚集;免疫印迹证明具有生物活性.该纯化工艺产品收率高,纯度高,质量检验方法稳定可靠,为大规模生产该蛋白提供参考.     

亲和层析法去除新生小牛血清内毒素的初步研究

以琼脂糖凝胶Sepharose 4 FF为介质,分别经CNBr和NHS活化后偶联多粘菌素B(Polymyxin B,PMB)为配基,制备两种不同间隔臂的亲和层析柱;选择偶联配基载量较高的亲和柱Sepharose 4 FF-CN-PMB,分析亲和层析温度、流速、pH值及盐离子浓度等参数对亲和层析效果的影响,优化小牛血清亲和层析去除内毒素工艺;通过细胞增殖实验研究内毒素去除工艺对小牛血清促细胞生长活性的影响。结果表明:制备了具有高PMB配基载量的亲和层析柱,利用该亲和层析柱建立了去除新生小牛血清内毒素的最优工艺;经该工艺处理后,小牛血清中内毒素含量大大降低,同时并未对其细胞增殖活性产生显著影响。本研究将为进一步降低小牛血清成本,提高小牛血清质量,推动生物制品开发奠定基础。     

大肠杆菌内毒素对Vero细胞培养的作用研究

将精制大肠杆菌内毒素(E.COliEndotoxin)加入含血清细胞培养液(MEM)中,配制成浓度分别为50、100、200、500EU/mL的细胞培养液 用此培养液对Vero细胞进行培养,测定细胞生长曲线、细胞平均倍增时间、最大增殖浓度及台盼蓝拒染率等指标,研究大肠杆菌内毒素对非洲绿猴肾细胞(Vero)培养的影响 结果显示,内毒素含量为50EU/mL时,Vero细胞仍能正常生长 当内毒素含量逐渐升高,培养时间逐渐延长时,细胞的增殖速度及活率明显下降 这表明,内毒素对Vero细胞的生长及活性具有明显的抑制作用,且该作用具有一定的时间、剂量依赖性     

重组工程菌E.coli BL21(DE3)-pET29a-aiiA可溶性AiiA蛋白的发酵条件优化

通过对工程菌E.coli BL21(DE3)-pET29a-aiiA的摇瓶发酵培养条件进行优化,确定了AiiA蛋白可溶性表达的最佳发酵培养基为牛肉膏蛋白胨.目的蛋白可溶性表达的最佳诱导条件为:IPTG浓度0.6 mmol/L,诱导初始OD600为0.5,诱导时间为20 h,温度20℃,pH为7.0,微量元素Na2HPO420 mmol/L,250 mL三角瓶的装液量为70 mL.优化前可溶性AiiA蛋白的相对含量为2.23 mg/mL,占总目的蛋白的31.4%,优化后达到4.54 mg/mL,占总目的蛋白的60.3%,大大提高了目的蛋白的可溶性表达.     

毕赤酵母表达人Neuritin蛋白的条件优化、纯化及鉴定

对毕赤酵母表达重组Neuritin蛋白的产物进行了纯化和鉴定,并进行了细胞毒性的量效关系的研究,为进一步应用于动物模型的实验研究奠定基础。应用甲醇诱导毕赤酵母工程菌株GS115/pPIC9K-rhNeuritin表达Neuritin蛋白,对甲醇诱导的浓度和时间进行了优化。表达产物经Ni-NAT纯化和透析浓缩,进行SDS-PAGE和Western-blot鉴定,将纯化产物用于体外培养的大鼠胸主动脉平滑肌细胞,对Neuritin蛋白与细胞存活的量效关系进行了研究。条件优化的结果显示,1%甲醇浓度诱导表达96h时,Neuritin蛋白表达量最大,可达0.48mg/mL。SDS-PAGE确定了表达产物分子量的大小,约为11kda;Western-blot证实表达产物为Neuritin;进一步的细胞毒性实验显示,纯化后的Neu-ritin蛋白在2.5μg/mL的浓度比较适合细胞生存。毕赤酵母高效分泌性表达了人Neuritin蛋白,经过镍柱亲和层析得到了有效的纯化,其发挥生物学作用的蛋白浓度为2.5μg/mL。     

熬制时间对香菇菌汤品质的影响

以香菇和鱼块为主要原料,研制了香菇菌汤产品,考察了熬制时间对菌汤品质的影响。结果表明,以鱼块煮制底汤,加入香菇微沸熬制25 min ,可制备高品质的香菇菌汤产品。其菌汤中多糖含量68.0μg/mL ,蛋白质含量21.0 mg/mL ,氨基酸含量2.1 mg/mL ,呈味核苷酸含量45.0μg/mL ,营养物质和滋味物质的含量高;通过感官评价,香菇菌汤香气浓郁,鲜美可口。     

几种不同风味牛奶中钙镁锌元素的含量测定

通过用微波消解法处理牛奶样品,用火焰原子吸收光谱法测定牛奶中钙、镁、锌元素的含量,为人们根据需求选用牛奶提供依据,同时为营养师的营养配餐提供参考.经测定,在所检样品中:高钙牛奶和加钙牛奶中钙的含量最高,分别为166.8 mg/100 mL和132.9 mg/100 mL;特品牛奶中钙含量较高,为110.4 mg/100 mL;巧克力牛奶中含钙量较低,为87.8 mg/100 mL;其他风味牛奶的含钙量为100 mg/100 mL.盒装巧克力奶与盒装特品纯牛奶中镁的含量较高,分别为13.71 mg/100 mL和12.25 mg/100 mL;红枣酸奶和酸牛奶中含镁量较低,均约为9.30 mg/100mL;其他风味牛奶含镁量约为11.20 ～ 11.3 mg/100 mL.盒装高钙奶中锌的含量最高,为0.64mg/100 mL;酸牛奶和红枣酸奶中锌的含量较低,分别为0.36 mg/100 mL和0.38 mg/100 mL;其他风味牛奶的含锌量约为0.43 mg/100 mL.不同风味牛奶中钙、镁、锌元素的含量不完全一致.     

胃癌细胞株(SGC)细胞表面凝集素受体性质的研究

研究了温度、反应时间、蛋白水解酶和单糖对凝集素与SGC细胞反应的关系,还测定了几种凝集素对SGC细胞的毒性作用.结果表明:SGC细胞在50℃保温30min后,细胞表面的凝集素受体基本失活;凝集素与SGC细胞在25℃温育90min后,其凝集反应的强度不再增加;SGC细胞经胰蛋白酶和胶原酶处理后,对细胞表面受体的活性影响不大,但经木瓜蛋白酶处理后,则其受体活性全部丧失;Man、Glc、GlcNAc可以抑制SFL对SGC细胞的凝集作用,但几种单糖对SLL与SGC的凝集作用均无明显的抑制作用;LPL、LPL_1和SLL对培养的SGC细胞具细胞毒性作用,当浓度分别为0.5mg/mL、0.1mg/mL、5mg/mL时,就能使细胞坏死.     

MTT法检测鸡外周血淋巴细胞增殖性反应的最佳条件探讨

对鸡外周血淋巴细胞增殖反应MTT比色法的四个主要因素,即培养时间、ConA浓度、细胞浓度及培养液小牛血清等应用L_16(4~5)四因素四水平正交试验设计,对最佳反应条件进行了研究．结果表明、影响增殖反应的主次顺序为ConA、细胞浓度、培养时间及血清浓度;最佳反应条件为:15μg/ml的ConA、1×10~7/ml细胞、10%小牛血清及48小时的培养时间.     

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.     

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.     

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.