Antigenic differences between a primary hamster lymphosarcoma and its liver metastases

An antiserum was raised in rabbits against a primary metastasizing lymphosarcoma (ML) of the hamster. This was made tumor-specific by absorption with normal hamster tissue extracts. Immunoglobulin-G was prepared and tested for its cytotoxicity towards cells derived from the primary tumor and its liver metastases. The ML-specific IgG was found to be 2--5 times more cytotoxic for cells derived from the primary tumor compared to cells obtained from liver metastases.     

薄膜显微结构的研究

采用复型技术,在透射电镜中观察到厚度大于0.5μm的蒸发淀积Al膜的显微结构,实验结果表明,膜的表面呈岛状结构,侧面呈柱状结构,同时也探讨了影响“柱”直径大小的因素。     

一类周期离散非线性Schrdinger系统的无穷多解

利用临界点理论和广义Nehari流形方法,考虑一类周期离散非线性Schrdinger系统,得到了该类系统无穷多个几何不同解的存在性,并用该方法得到了单个周期离散Schrdinger方程解的多重性.     

Identification of ALK as a major familial neuroblastoma predisposition gene

Neuroblastoma is a childhood cancer that can be inherited, but the genetic aetiology is largely unknown. Here we show that germline mutations in the anaplastic lymphoma kinase (ALK) gene explain most hereditary neuroblastomas, and that activating mutations can also be somatically acquired. We first identified a significant linkage signal at chromosome bands 2p23-24 using a whole-genome scan in neuroblastoma pedigrees. Resequencing of regional candidate genes identified three separate germline missense mutations in the tyrosine kinase domain of ALK that segregated with the disease in eight separate families. Resequencing in 194 high-risk neuroblastoma samples showed somatically acquired mutations in the tyrosine kinase domain in 12.4% of samples. Nine of the ten mutations map to critical regions of the kinase domain and were predicted, with high probability, to be oncogenic drivers. Mutations resulted in constitutive phosphorylation, and targeted knockdown of ALK messenger RNA resulted in profound inhibition of growth in all cell lines harbouring mutant or amplified ALK, as well as in two out of six wild-type cell lines for ALK. Our results demonstrate that heritable mutations of ALK are the main cause of familial neuroblastoma, and that germline or acquired activation of this cell-surface kinase is a tractable therapeutic target for this lethal paediatric malignancy.     

Quantification of digoxin by enzyme immunoassay: synthesis of a maleimide derivative of digoxigenin succinate for enzyme coupling

Summary We synthesized the m-maleimidobenzoyl derivative of digoxigenin-3-0-succinate (through a p-phenylenediamine bridge) as a hapten derivative directed towards coupling to sulfhydryl groups of -galactosidase. Prepared enzyme conjugate had about 97% of the enzyme labeled with the hapten derivative while retaining full enzyme activity. The enzyme immunoassay for digoxin we prepared showed a maximum sensitivity of 30 pg per assay (c.v.=3%) with minimal cross-reaction with digotoxin (3.8%). Our method for hapten conjugation to -galactosidase is highly efficient and is simple and easily replicated.     

壬二酸的性质、合成和应用

本综述了壬二酸的性质，用途及合成方法。介绍了国内外采用臭氧氧化法合成壬二酸的研究进展。对臭氧氧化法合成壬二酸的反应机理，合成工艺做了较为系统的总结并对臭氧氧化法在精细化工中的应用做了展望：臭氧氧化法作为一种清洁工艺在油脂深加工和精细化工产品的开发方面大有可为。     

Systems thinking in corporate development strategy: The case of Armco Latin American Division

In this paper we examine the role of top management in relation to the diversified operations of a company and the meaning of “strategic planning” for these entities. We briefly examine two general approaches to generation of growth: conglomeration (portfolio management) and synergistic growth. We argue that the second is preferable. We then challenge the universally popluar notion that growth is the appropriate objective for a business entity. We propose the concept of “development” as a better alternative. We offer the case of Armco's Latin American Division (known as ALAD) as an illustration of the kind of thinking that emerges when development is taken as the corporate objective. We present a five-phase strategy that combines the notions of synergistic growth and corporate development in a systemic framework.     

Effect of Al2O3 and Y2O3 on the corrosion behavior of ZrO2-benzotriazole nanostructured coatings applied on AA2024 via a sol-gel method

zirconia-based nanostructured coatings were deposited on AA2024 to improve the corrosion resistance properties. Three different nanostructured coatings, namely, zirconia-benzotriazole, zirconia-alumina-benzotriazole, and zirconia-yttria-benzotriazole, were applied on AA2024 via a sol-gel method using the dip-coating technique. Next, the coatings were annealed at 150℃ after each dipping period. The phases and morphologies of the coatings were investigated using grazing incidence X-ray diffraction (GIXRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM). The corrosion properties were evaluated using electrochemical methods, including polarization and electrochemical impedance techniques in 3.5wt% NaCl solution. The obtained results confirm the formation of homogeneous and crack free zirconia-benzotriazole-based nanostructured coatings. The average roughness values for zirconia-benzotriazole, zirconia-alumina-benzotriazole, and zirconia-yttria-benzotriazole nanostructured coatings were 30, 8, and 6 nm, respectively. The presence of alumina as a stabilizer on zirconia coating was found to have a beneficial impact on the stability of the corrosion resistance for different immersion times. In fact, the addition of alumina resulted in the dominance of the healing behavior in competition with the corrosion process of zirconia-benzotriazole nanostructured coating.     

响应面法优化微波辅助提取豆腐柴果胶工艺及其抗氧化研究

豆腐柴含有丰富的果胶,具有多样的药理活性.在单因素试验基础上,以果胶提取率为指标,采用Box-Behnken优化其微波辅助提取工艺,并通过测定果胶对羟基自由基和超氧阴离子的清除率来研究豆腐柴果胶体外抗氧化活性.结果显示,豆腐柴果胶的最佳提取工艺为:微波功率635 W、提取时间29 s、液料比20:1(m L/g),该条件下果胶提取率平均值为20.31%.豆腐柴果胶对羟基自由基和超氧阴离子自由基有较强的清除作用,显示其具有良好的抗氧化活性.