兔眼辐射损伤后角膜和晶体上皮细胞DNA含量的定量分析

利用改良Feulgen染色和图像分析技术对不同剂量6 0 Coγ射线 (0、 10、 2 0和 30Gy)和照后不同时间 (3、 15天和 1、 3、 6个月 )的兔眼角膜和晶体上皮细胞的DNA含量进行了定量分析。结果表明 ,各剂量组DNA含量的MOD和IOD值降低 ,与对照组相比均有明显差异 (p<0 0 1) ,提示辐射能引起角膜及晶体上皮细胞核中DNA含量发生规律性变化 ,因此角膜及晶体上皮细胞DNA含量测定可以作为眼辐射损伤的指标之一 ,为其诊断提供实验依据。     

一种基于多门限二进制编码的多光谱图像分类新方法

不同类型的地物具有不同的反射光谱 ,在多维光谱空间中构成不同的特征向量 ,这便是遥感多光谱图象分析与识别的物理依据。传统方法中有基于单个象元波段亮度的、空间纹理的、变换空间的多光谱图象特征提取与分析方法 ,但这些方法并没有直接描述地物的最本质特征———反射光谱曲线 ,从上个世纪 80年代开始 ,当二进制编码的方法提出并在多光谱匹配识别中获得成功应用后 ,多光谱图象分析处理便可以在这种特征提取的基础上 ,研究新的方法。本文提出一种基于光谱形状描述的多门限的二进制编码分类方法 ,并给出了图象实验的结果。     

Haptoglobin-alpha subunit as potential serum biomarker in ovarian cancer: identification and characterization using proteomic profiling and mass spectrometry.

PURPOSE: The objective of this study was to identify and characterize new serum biomarkers in ovarian cancer patients using mass spectrometric protein profiling and specific immunological assays. Experimental Design: Serum samples from 80 cancer patients and 91 healthy women were analyzed by surface enhanced laser desorption and ionization-mass spectrometry (MS) profiling. A candidate biomarker was purified by affinity chromatography, and its sequence was determined by liquid chromatography-tandem MS. An antibody was generated from the synthesized peptide for quantitative validation in the cases and controls. CA125 was determined and compared with the same set of specimens. RESULTS: Using surface enhanced laser desorption and ionization, we found a serum biomarker at approximately 11700 Da, which had peak intensity significantly higher in cases (1.366) compared with controls (0.208, P = 0.002), and subsequently identified this as the alpha chain of haptoglobin. ELISA indicated that Hp-alpha was 相似文献   

beta-Catenin and ras oncogenes detect most human colorectal cancer.

PURPOSE AND STUDY DESIGN: Recent studies have shown that beta-catenin translocated into the cell nucleus functions like an oncogene. Accumulating evidence suggests that activation of the beta-catenin oncogenic signaling cascade along with its twin, the K-ras cascade, may exert syngeneic or synergistic effects on tumor development and progression. In the study reported here, we analyzed oncogenic beta-catenin activation on the basis of its nuclear accumulation (NA) and compared the results with those of mutational activation of K-ras in 74 patients with colorectal cancer to determine whether the two oncogene-mediated signaling cascades interact. RESULTS: We found two distinct patterns of beta-catenin activation, i.e., diffuse NA in 20 cases (27%) and selective NA at the tumor invasion front (NAinv) in 19 cases (26%). The presence of the NAinv pattern was significantly correlated with advanced Dukes' stage tumor (P = 0.0005) and the presence of distant metastases (P = 0.0064). K-ras proto-oncogene was mutated in the tumors of 31 cases (42%). Activated beta-catenin or K-ras was detected in most (78%) colorectal cancers analyzed, although a weak inverse correlation was found between the activities of the two oncogenes in the tumors. Importantly, most (7 of 8) patients with tumor showing both K-ras activation and the NAinv pattern of beta-catenin activation were in Dukes' stage C at surgery, and half of them developed distant metastases to the liver and lungs. CONCLUSION: The results suggest that although oncogenic activation of beta-catenin and K-ras is independent in the process of clinical cancer development, combined analysis of the two major oncogenes can detect most colorectal cancers and identify a subset of patients with poorer outcomes. Consequently, activation of either or both of these oncogenes may serve as a genetic marker for molecular diagnosis.     

狭叶半夏和普通半夏总生物碱含量比较

目的　比较狭叶半夏和普通半夏总生物碱含量。方法　重量法和酸性染料比色法。结果　重量法和酸性染料比色法均测得狭叶半夏总生物碱含量高于普通半夏。结论　总生物碱含量上的差异反应了二者品质上的优劣 ,这从一个方面说明狭叶半夏品质优于普通半夏     

桔梗冬花片质量标准的研究

目的　制定桔梗冬花片质量控制方法。方法　采用薄层色谱法对处方中的桔梗、甘草进行定性鉴别 ;采用高效液相色谱法对处方中甘草中甘草酸进行含量测定。结果　甘草酸在 0 .186 6～ 1.6 794 μg呈良好的线性关系 ,r=0 .99997,平均回收率为 98.70 ,RSD=0 .77。结论　该方法准确可靠地进行定性、定量检测 ,能有效地控制制剂的质量。     

PNS单体Rb_l对豚鼠心脏乳头肌动作电位和收缩力的影响

目的 :了解PNS单体Rbl对豚鼠心脏乳头肌动作电位和收缩力的影响。方法 :运用带有动作电位和收缩力分析软件控制的细胞内微电极技术 ,研究了三七皂苷 (PNS)单体Rbl对豚鼠正常心脏乳头肌动作电位 (AP)各特征参数及收缩力 (FC)的影响。结果 :Rb1 1 0～ 30 μmol·L- 1 分别使APD 2 0 ,APD 90明显缩短 ,FC显著下降 (P<0 .0 1 ,n =5) ,并可降低高钾诱发的豚鼠乳头肌慢反应动作电位的动作电位幅值 (APA)及零相最大上升速率(Vmax) (P <0 .0 5 ,n =5)。但对静息电位 (RP) ,APA ,Vmax及AP的超射值 (OS)无明显影响 (P >0 .0 5 ,n =5)。另外 ,Rbl可浓度依赖性地抑制乳头肌收缩力 (FC) ,RP ,APA不随Rbl剂量增加而产生明显变化 ,呈典型的兴奋 收缩脱藕联。结论 :其效应可能通过阻滞钙通道而产生     

中药复方化学与创新药物研究

中药复方化学与创新药物研究是中药现代化研究中的关键课题,本文简要回顾了中药复方化学研究的概况,论述了中药复方化学研究的思路和方法学,结合研究实践,阐明以中药复方化学研究所发掘出的中药复方有效部位(群)或有效成分(群)为基础,研制创新药物是实现中药现代化与国际化的有效途径。     

大孔吸附树脂吸附分离技术在中药复方纯化分离中的应用

中药复方有效部位(群)或有效成分(群)的提取、分离与纯化,是实现中药现代化的关键技术之一。本文综述大孔吸附树脂吸附分离技术用于中药复方有效部位(群)或有效成分(群)纯化分离的优势及应用特点。     

国产、进口乌拉地尔对全麻气管拔管心血管反应的比较观察

目的 :观察国产、进口乌拉地尔对全麻拔管期心血管反应的影响。方法 :60例无高血压病史的择期全麻手术病人随机分为 3组 ,分别为国产乌拉地尔组、进口乌拉地尔组和对照组。三组病人麻醉诱导均相同。术毕当病人符合拔管指征时 ,静注乌拉地尔 0 4mg/kg ,或等量生理盐水 (对照组 )。观察记录拔管前、拔管时、拔管后 1分钟、5分钟的SP、DP、HR ,并计算SP与HR的乘积RPP。结果 :对照组拔管后SP、DP、HR、RPP均较拔管前显著升高 (P <0 0 5 ) ,尤以拔管时至拔管后 1分钟为著 (P <0 0 1)。围拔管期两组乌拉地尔组的血流动力学变化非常相似 ,SP、DP较拔管前均无明显变化 ,而HR则均明显升高 (P <0 0 5 ) ,与对照组相比SP、DP和RPP的变化均明显降低(P <0 0 1)。结论 :国产乌拉地尔与进口制剂具有同等的降压效能 ,可削弱拔管期高血压反应