STUDY ON MECHANISM OF SUPERSENSITIZATION OF SOME ALLOPOLAR TRINUCLEAR CYANINE DYES

ＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＳＵＰＥＲＳＥＮＳＩＴＩＺＡＴＩＯＮＯＦＳＯＭＥＡＬＬＯＰＯＬＡＲＴＲＩＮＵＣＬＥＡＲＣＹＡＮＩＮＥＤＹＥＳＺＨＡＮＧＪＩＮ－ＬＯＮＧ；ＣＨＥＮＬＩＡＮ－ＳＨＥＮ；ＺＨＵＺＨＥＮＧ－ＨＵＡ（ＲｅｓｅａｒｃｈＩｎｓｔ...     

CATION－ENHANCED INTRAMOLECULAR PHOTODIMERI－ZATION AND EXCIMER FORMATION OF POLYE－THERS BEARING NAPHTHALE

ＣＡＴＩＯＮ－ＥＮＨＡＮＣＥＤＩＮＴＲＡＭＯＬＥＣＵＬＡＲＰＨＯＴＯＤＩＭＥＲＩ－ＺＡＴＩＯＮＡＮＤＥＸＣＩＭＥＲＦＯＲＭＡＴＩＯＮＯＦＰＯＬＹＥ－ＴＨＥＲＳＢＥＡＲＩＮＧＮＡＰＨＴＨＡＬＥＮＥＣＨＲＯＭＯＰＨＯＲＥＳＴ＿（ＯＮＧ）Ｚ＿（ＨＥＮ－ＨＥ...     

EXPERIMENTAL INVESTIGATION OF KINETIC AND TRANSPORT PARAMETERS IN A WALL－COOLED FIXED－BED REACTOR

ＥＸＰＥＲＩＭＥＮＴＡＬＩＮＶＥＳＴＩＧＡＴＩＯＮＯＦＫＩＮＥＴＩＣＡＮＤＴＲＡＮＳＰＯＲＴＰＡＲＡＭＥＴＥＲＳＩＮＡＷＡＬＬ－ＣＯＯＬＥＤＦＩＸＥＤ－ＢＥＤＲＥＡＣＴＯＲＺｈｅｎ－ＭｉｎＣＨＥＮＧａｎｄＷｅｉ－ＫａｎｇＹＵＡＮ（ＵＮＩＬＡＢＲｅｓｅ...     

理化因子对嗜盐隐杆藻细胞生长及胞外多糖产量的影响

比较不同ＮａＣｌ、Ｃａ２＋、ＰＯ３－４等离子浓度对嗜盐隐杆藻（Ａｐｈａｎｏｔｈｅｃｅｈａｌｏｐｈｙｔｉｃａ）细胞生长及胞外多糖（Ｅｘｏｐｏｌｙｓａｃ－ｃｈａｒｉｄｅＥＰＳ）产量的影响。在各影响因子不同浓度的培养条件下,０．５ｍｏｌ／Ｌ的ＮａＣｌ、１．０ｇ／Ｌ的Ｃａ（ＮＯ３）２·４Ｈ２Ｏ、０．１ｇ／Ｌ的ＫＨ２ＰＯ４分别是其最佳生长浓度。ＥＰＳ的产量在０．５ｍｏｌ／ＬＮａＣｌ、,０．５ｇ／ＬＣａ（ＮＯ３）２·４Ｈ２Ｏ、０．５ｇ／Ｌ的ＫＨ２ＰＯ４培养条件下最高。在较低的Ｃａ２＋、Ｍｇ２＋、ＰＯ３－４浓度下可提高ＥＰＳ产率。     

Y－TYPE ZEOLITES AS MICRO－REACTORS FOR PHOTOCHEMICAL PREPARATION OF LARGE－RING COMPOUNDS

Ｙ－ＴＹＰＥＺＥＯＬＩＴＥＳＡＳＭＩＣＲＯ－ＲＥＡＣＴＯＲＳＦＯＲＰＨＯＴＯＣＨＥＭＩＣＡＬＰＲＥＰＡＲＡＴＩＯＮＯＦＬＡＲＧＥ－ＲＩＮＧＣＯＭＰＯＵＮＤＳ￥ＴＯＮＧＺｈｅｎｈｅ；（ＴＵＮＧＣｈｅｎｈｏ）；ＷＵＬｉｚｈｕ（ＩｎｓｔｉｔｕｔｅｏｆＰｈｏ...     

1—2折流换热器流体温度沿程变化及其LMTD的计算

１－２折流换热器流体温度沿程变化及其ＬＭＴＤ的计算梁日忠ＴＨＥＶＡＲＩＡＴＩＯＮＯＦＦＬＵＩＤＴＥＭＰＥＲＡＴＵＲＥＡＬＯＮＧＳＩＤＰＡＳＳＡＮＤＴＨＥＣＡＬＵＡＴＩＯＮＯＦＬＭＴＤＩＮ１－２ＢＡＦＦＬＥＨＥＡＴＥＸＣＨＡＮＧＥＲ１前言换热器设计中，...     

HAN-TEAN-H_2O 三元体系的相变及其相图

用ＤＳＣ研究了ＨＡＮ－ＴＥＡＮ－Ｈ２Ｏ三元体系的低温热行为，建立了该体系低温下相变与组分关系的相图。考察了玻璃化转化温度随ＨＡＮ／ＴＥＡＮ比例的变化规律。发现了三元体系的溶液性质在ＨＡＮ－ＴＥＡＮ比率较大时，与ＨＡＮ－Ｈ２Ｏ二元体系相似，而在ＨＡＮ／ＴＥＡＮ比率较小时，则与ＴＥＡＮ－Ｈ２Ｏ二元体系相似。     

永芳高级系列产品为联合国第四次世界妇女大会唯一指定专用护肤品

永芳高级系列产品为联合国第四次世界妇女大会唯一指定专用护肤品ＹＯＮＧＦＯＮＧＳＵＰＥＲＨＩＧＨ－ＱＵＡＬＩＴＹＰＲＯＤＵＣＴＳＳＥＲＩＥＳＩＳＴＨＥＳＯＬＥＳＫＩＮＣＡＲＥＣＯＳＭＥＴＩＣＳＳＰＥＣＩＡＬＬＹＤＥＳＩＧＮＡＴＥＤＢＹＴＨＥＦＯＵＲＴＨ...     

第六届中日建材交流会玻璃钢组考察报告

第六届中日建材交流会玻璃钢组考察报告陈博（中国玻璃钢工业协会１００８３１）ＮＶＥＳＴＩＧＡＴＩＯＮＲＥＰＯＲＴＯＦＴＨＥＦＲＰＧＲＯＵＰＡＴ６ＴＨＣＨＩＮＡ－ＪＡＰＡＮＢＵＩＬＤＩＮＧＭＡＴＥＲＡＬＥＸＣＨＡＮＧＭＥＥＴＩＮＧ￥ＣｈｅｎＢｏ（Ｃｈｉｎ...     

HAN-TEAN-H_2O 三元体系的玻璃化转变温度的依数性和微观结构的推测

用ＤＳＣ研究了九种不同ＴＥＡＮ／ＨＡＮ比率下ＨＡＮ－ＴＥＡＮ－Ｈ２Ｏ三元体系的玻璃化转变温度Ｔｇ与Ｈ２Ｏ含量的关系;根据Ｔｇ的变化规律初步推测了该三元体系的分子结构;讨论了ＴＥＡＮ的含量对玻璃化转变温度的影响,并把该三元体系与二元体系ＨＡＮ－Ｈ２Ｏ进行了对比。     

乳酸对重组CHO细胞生长代谢及EPO表达的影响

利用脉冲实验方法研究了乳酸和渗透压对重组CHO细胞生长代谢和EPO表达的影响 ,证明乳酸分子本身对重组CHO细胞的生长代谢和产物表达没有明显的影响 .乳酸浓度从 0增加到 6 9mmol·L^-1对应于渗透压从 30 0增加到 4 2 0mOsm ,细胞的比生长速率下降了 33% ,葡萄糖和谷氨酰胺的比消耗速率均增加了 2 3% ,细胞对葡萄糖和谷氨酰胺的得率系数分别下降了 4 5 %和 4 7% ,乳酸的比生成速率则保持恒定 ,表明在高渗透压下营养物的利用更倾向于能量代谢过程 ,好氧能量代谢过程所占的比例随着渗透压的增加而增加 ;另一方面 ,氨对谷氨酰胺的得率系数增加了 4 4 % ,丙氨酸对谷氨酰胺的得率系数下降了 2 4 % ,表明谷氨酰胺经谷氨酸脱氢酶途径的代谢流量随着渗透压的增加而增加 .EPO的比生成速率随着渗透压的增加而下降     

实验设计法在优化表达Fc融合蛋白的CHO细胞发酵培养工艺中的应用

目的通过实验设计(Design of Experiments,DOE)分析优化重组CHO细胞在生物反应器中的培养工艺。方法以2 L生物反应器控制参数温度(T)、pH及溶氧(dissolved oxygen,DO)作为变量,以蛋白表达量、蛋白纯度及蛋白唾液酸含量为响应变量,应用Design Expert 10软件进行3因素2水平DOE拟合分析,筛选最适表达Fc融合蛋白的CHO细胞发酵培养工艺参数,并采用5 L生物反应器进行验证。结果蛋白表达量仅与T有关,且呈成正相关,pH和DO对其无显著影响,T与pH对其有交互作用;蛋白纯度受T和pH影响显著,T呈负相关,pH呈正相关,DO对其无显著影响,T与pH对其有交互作用;唾液酸含量受T和pH影响显著,T呈正相关,pH呈负相关,DO对其无显著影响。最适工艺参数确定T为(34±0.5)℃,pH为(7.05±0.02),DO为(45±5)%。采用最适工艺参数的反应器与优化前工艺比较,活细胞密度(viable cell density,VCD)增加;蛋白表达量、蛋白纯度、唾液酸含量分别提高了29.7%、8%和87.9%。结论通过DOE方法快速优化了生物反应器培养表达Fc融合蛋白的CHO细胞的工艺参数,在不降低蛋白产量及纯度的前提下,极大提高了融合蛋白唾液酸含量。     

Human milk oligosaccharides. The rule in the health and development of the infants

Breast-feeding is the optimal mode of feeding for the normal full-term infant. Human milk composition knowledge has been basis for recommended dietary allowances for infants. Few studies about human milk carbohydrates have been done until the last decade. However, carbohydrates provide approximately 40-50% of the total energy content of breast milk. Quantitatively oligosaccharides are the third largest solute in human milk after lactose and fat. Each individual oligosaccharide is based on a variable combination of glucose, galactose, sialic acid, fucose and N-acetylglucosamine with many and varied linkages between them, thus accounting for the enormous number of different oligosaccharides in human milk. The oligosaccharides content in human milk varies with the duration of lactation, diurnally and with the genetic makeup of the mother. At present, a great interest in the roles of human milk oligosaccharides is raising. They act as a the soluble fibre in breast milk and their structure is available to act as competitive ligands protecting the breast-fed infant from pathogens and act as well as prebiotic. They may also act as source of sialic acid and galactose, essential for brain development. This is why today there is an increasing health and industrial interest in human milk oligosaccharides content, with the main purpose of incorporating them as new ingredients in infant nutrition.     

Effects of sodium butyrate on the transfer of arachidonic acid to phosphatidylcholine in a clonal oligodendrocyte cell line (CB-II)

The effect of sodium butyrate on membrane phospholipid metabolism in a neonate rat cerebellum derived clonal oligodendrocyte cell line (CB-II) was investigated. Sodium butyrate is an agent known to induce cell differentiation and morphological transformations. A comparison of thein vivo phospholipid labeling patterns obtained by incubating CB-II cells with [³H]choline, [¹⁴C]myristic acid or [³H]arachidonic acid indicated that butyrate altered the route of acylation-deacylation in phosphatidylcholine (PC) biosynthesis. Using anin vitro incubation system containing homogenates of CB-II cells, the largest proportion of radioactivity was found in PC, and addition of sodium butyrate resulted in a further increase in the transfer of arachidonic acid to PC, but not to phosphatidylinositol. Similar results were obtained when thisin vitro acylation activity was tested using homogenates from sodium butyrate pretreated cells. The butyrate effect was observed regardless of whether or not exogenous lysophosphatidylcholine (LPC) was added to the incubation system. Addition of butyrate did not result in a change in the activity of LPC:acyl-CoA (coenzyme A) acyltransferase (EC 2.3.1.23) in CB-II cells upon incubating cell homogenates with [1-¹⁴C]arachidonoyl-CoA and LPC. However, when cell homogenates were incubated with [³H]arachidonic acid in the presence of 2.5–10 mM sodium butyrate, arachidonoyl-CoA synthesis was stimulated. A time course study demonstrated that significant stimulation occurred after three minutes. Taken together, the results suggest that in CB-II cells, sodium butyrate stimulates the transfer of arachidonic acid into PC and that this effect is at least partially due to a stimulation of arachidonoyl-CoA ligase (EC 6.2.1.3).     

Engineering a soluble extracellular erythropoietin receptor (EPObp) in Pichia pastoris to eliminate microheterogeneity, and its complex with erythropoietin

The extracellular ligand-binding domain (EPObp) of the humanEPO receptor (EPOR) was expressed both in CHO (Chinese HamsterOvary) cells and in Pichia pastoris. The CHO and yeast expressedreceptors showed identical affinity for EPO binding. Expressionlevels in P.pastoris were significantly higher, favoring itsuse as an expression and scale-up production system. Incubationof EPO with a fourfold molar excess of receptor at high proteinconcentrations yielded stable EPO–EPObp complexes. Quantificationof EPO and EPObp in the complex yielded a molar ratio of oneEPO molecule to two receptor molecules. Residues that are responsiblefor EPOR glycosylation and isomerization in Pichia were identifiedand eliminated by site-specific mutagenesis. A thiol modificationwas identified and a method was developed to remove the modifiedspecies from EPObp. EPObp was complexed with erythropoietin(EPO) and purified. The complex crystallized in two crystalforms that diffracted to 2.8 and 1.9 Å respectively. (Form1 and form 2 crystals were independently obtained at AxyS Pharmaceuticals,Inc. and Amgen, Inc. respectively.) Both contained one complexper asymmetric unit with a stoichiometry of two EPObps to oneEPO.     

三聚磷酸钠水解及滴定法测量其含量

研究了常温下三聚磷酸钠在不加酸与加不同浓度硝酸的条件下,溶解放置后发生水解的情况,并对三聚磷酸钠在50 ℃条件下加热不同时间的水解情况做了考察。结果表明,溶液的pH减小和温度升高会使三聚磷酸钠的水解速率加快,其中温度是影响三聚磷酸钠水解的主要因素。同时,用滴定法测定了三聚磷酸钠的含量,样品加热沸腾25 min时三聚磷酸钠几乎完全水解,测得样品中三聚磷酸钠的质量分数为99.31%。     

Influence of lignosulphonate,glucose and gluconate on the C3A hydration

The influence of desugarized sodium lignosulphonate, glucose and sodium gluconate on the C₃A hydration has been examined using DTG analysis. At relatively low concentration levels of admixtures in the aqueous phase (1 to 3 g/l), such as those practically used for concrete mixes, lignosulphonate and glucose retard only slightly the C₃A hydration. Sodium gluconate is significantly more efficient in retarding C₃A hydration than lignosulphonate and glucose.     

不同浓度抗菌素对血浆纤维蛋白原的影响

目的研究4种常用抗菌素的浓度对血浆纤维蛋白原的影响。方法采用凝固法,以加入抗菌素后血浆中纤维蛋白原的凝固时间为指标,观察不同浓度的头孢哌酮钠、氯霉素、乳酸环丙沙星和硫酸庆大霉素对血浆纤维蛋白原的影响。结果随着氯霉素、硫酸庆大霉素和乳酸环丙沙星浓度的降低,血浆中纤维蛋白原的凝固时间延长;而随着头孢哌酮钠浓度的降低,凝固时间反而缩短。随着氯霉素、硫酸庆大霉素、乳酸环丙沙星浓度降低,血浆中纤维蛋白检出率升高;随着头孢哌酮钠浓度降低,血浆中纤维蛋白原检出率亦降低。结论头孢哌酮钠、氯霉素、乳酸环丙沙星、硫酸庆大霉素等抗菌素及其浓度变化对血浆中纤维蛋白原的凝固时间和检出率有显著影响。     

Strain-promoted alkyne-azide cycloadditions (SPAAC) reveal new features of glycoconjugate biosynthesis

We have shown that 4-dibenzocyclooctynol (DIBO), which can easily be obtained by a streamlined synthesis approach, reacts exceptionally fast in the absence of a Cu(I) catalyst with azido-containing compounds to give stable triazoles. Chemical modifications of DIBO, such as oxidation of the alcohol to a ketone, increased the rate of strain promoted azide-alkyne cycloadditions (SPAAC). Installment of a ketone or oxime in the cyclooctyne ring resulted in fluorescent active compounds whereas this property was absent in the corresponding cycloaddition adducts; this provides the first example of a metal-free alkyne-azide fluoro-switch click reaction. The alcohol or ketone functions of the cyclooctynes offer a chemical handle to install a variety of different tags, and thereby facilitate biological studies. It was found that DIBO modified with biotin combined with metabolic labeling with an azido-containing monosaccharide can determine relative quantities of sialic acid of living cells that have defects in glycosylation (Lec CHO cells). A combined use of metabolic labeling/SPAAC and lectin staining of cells that have defects in the conserved oligomeric Golgi (COG) complex revealed that such defects have a greater impact on O-glycan sialylation than galactosylation, whereas sialylation and galactosylation of N-glycans was similarly impacted. These results highlight the fact that the fidelity of Golgi trafficking is a critical parameter for the types of oligosaccharides being biosynthesized by a cell. Furthermore, by modulating the quantity of biosynthesized sugar nucleotide, cells might have a means to selectively alter specific glycan structures of glycoproteins.     

硫酸氢钠催化合成丁酸异丁酯

硫酸氢钠能够代替硫酸作为酯化作用催化剂。在一水硫酸氢钠存在下，由正丁酸和异丁醇合成了丁酸异丁酯。在正丁酸，异丁醇和硫酸氢钠的物质的量比为4：3：0．07，回流分水60min，酯收率达99．3％，同时研究了催化剂的重复使用性能。