清洁泡沫自转向酸转向机理研究

通过室内实验评价了一种新型清洁泡沫自转向酸;并利用并联岩心分流试验装置进行分流实验,研究了岩心渗透率大小、级差以及温度对清洁泡沫自转向酸转向效果的影响。实验结果表明:在170 s-1剪切速率下,初始黏度为21 mPa·s,与碳酸盐岩反应后黏度最高升至273 mPa·s。当温度小于60℃时,温度对酸液体系泡沫半衰期的影响较小;但在温度高于60℃后,泡沫稳定性迅速下降,100℃时泡沫半衰期仅为2.9 min。随着并联岩心渗透率级差的增加,低渗岩心渗透率改造率逐渐降低,转向效果下降;在相同渗透率级差下,岩心渗透率越小转向效果越差;当温度大于60℃时,该酸液体系转向效果大幅度下降。     

Induction of multi-epitopespecific antibodies against HIV-1 by multi-epitopevaccines

Some neutralizing antibodies against HIV-1 envelope proteins were highly effective to inhibit the infection of different strainsin vitro, and existed in the infected individuals with very low levels. We suggested multi-epitope-vaccine as a new strategy to increase levels of neutralizing antibodies and the abilities against HIV mutationin vivo. Two candidate multi-epitope-vaccines induced antibodies with predefined multi-epitope-specificity in rhesus macaque. These antibodies recognized corresponding neutralizing epitopes on epitope-peptides, gp41 peptides, V3 loop peptide, rsgp41 and rgp120. Besides, three candidate epitope-vaccines in combination (another kind of multi-epitopevaccines) showed similar potency to induce predefined multiple immune responses in rabbits. These results suggest that multi-epitope-vaccines may be a new strategy to induce multi-antiviral activities against HIV-1 infection and mutations.     

Isolation, purification and characterization of secondary structure of antifreeze protein fromAmmopiptanthus mongolicus

Antifreeze protein (AFP) from Ammopiptanthus mongolicus leaves was isolated and purified with DEAE cellulose 52, Sephacryl 300, heat treatment and preparative isotachophoresis. The molecular weight of AFP was 50 ku by SDS-PAGE measurement. The average thermal hysteresis activity (THA) of AFP was 0.35℃ at 5 mg/mL using a differential scanning calorimeter (DSC). This AFP showed heated stability. From circular dichroism (CD) of AFP spectral data from 195—240 nm, a well-defined secondary structure of 11% a-helix, 34% antiparallel b-sheet and 55% random coil for the plant AFP was deduced.     

An acidic polysaccharide with xylose branches fromPorphyra yezoensis

An acidic polysaccharide (PY3) was isolated from the hot water extract of the red algae Porphyra yezoensis by successive column chromatographies over DEAE-cellulose and Sephadex G-200. PY3 with an average molecular weight of 1.8×10⁵ was demonstrated to be composed of galactose (Gal), 3,6-anhydrogalactose (3,6-AnGal), 6-OSO₃-galactose (6-OSO₃-Gal) and xylose (Xyl) in an approximate molar ratio of 25︰15︰10︰1. In view of Smith degradation and methylation and on the basis of spectral evidence including those of IR, GC, GC-MS, and ¹H and ¹³C NMR, the most probable repeating unit of PY3 could be proposed as [(1→3)β-D-Gal(1→4)α-L-3,6-AnGal]₃-[(1→3)β-D-Gal(1→4)α-L- 6-OSO₃-Gal]₂ with a xylose moiety at the C₆ of one of every twenty-five β-D-Gal residues. To our knowledge, PY3 was shown to be the first porphyran possessing occasional xylose branches.     

关于视觉传达的再思索

数字化技术的迅猛发展,开辟了视觉传达设计的广泛运用空间,图形语言的多维化结构与受众者感知心理出现强烈冲击,关于图形结构的理论内核和人类知觉经验中更深层中介理论,便成了现代设计活动中的主题。     

土结构性对软土地基性状的影响

结合土结构性理论 ,采用土结构弹塑性损伤模型 ,通过典型算例有限元分析 ,探讨软土地基性状 ,较好地解释工程实践中某些问题 .     

高氯酸稀土甘氨酸晶体结构的规律性

定量地考查了高氯酸稀土甘氨酸配合物的晶体结构数据,发现由于缺乏合理一致的确定配位原子是否参与配位的定量依据,造成了配合物的晶体结构结果上有一定程度的主观随意性。提出了一个确定配位原子是否参与配位的定量依据,重新确定了5种高氯酸稀土甘氨酸配合物,［RE     

吉安市双季早稻气候适宜度变化特征及评价分析*

为科学指导早稻生产,对江西省吉安市双季早稻生长季温、光、水的需求及当地气候条件进行分析,建立了双季早稻温度、降水、日照适宜度模型。根据模型分别计算了1961~2010年吉安市双季早稻生长季各气候因子的适宜度和逐旬各气候因子适宜度。结果表明,近50年来双季早稻气候适宜度总体偏低,且略有下降趋势;温度适宜度较降水、日照适宜度偏高,呈现出三个阶段的阶段式波动变化。双季早稻气候适宜度随生育进程总体呈上升趋势。降水适宜度整体偏低,是制约早稻生长发育的重要因子。温度适宜度对气候适宜度的影响占主要地位,秧苗期的低温、分蘖-孕穗期的低温、乳熟期的高温是导致其温度适宜度偏低的主要因素。     

三水合三氯三甘氨酸镱的晶体结构

为了研究稀土甘氨酸的基本性质,在水溶液中合成了「Ｙｂ（Ｇｌｙ）３（Ｈ２Ｏ）２」Ｃｌ３．Ｈ２Ｏ化合物,缓慢挥发水溶液（ｐＨ＝４～５）得到其单晶。研究了配合物的红外光谱和晶体结构,结果表明,晶体属正交晶系,空间群Ｐ２１２１２１２１。晶胞参数：ａ＝０．４７４９２（９）ｎｍ,ｂ＝１．１９１７（２）ｎｍ,ｃ＝３．０７１６（６）ｎｍ,Ｖ＝１．７３８４（４）ｎｍ＾３,Ｚ＝４,Ｄｃ＝２．１３５ｇ／ｃｍ＾３。晶体是     

CIMS下邮政物流网最优计划调度及质量监控系统

将ＣＩＭＳ的概念与哲理应用于邮政行业中,提出了ＣＩＭＳ环境下邮政通信物流网最优计划调度及质量监控系统的体系结构,并对其特点及关键技术进行了分析。