借助移相法采用多部CCD数码相机提高帧率的技术

对于科学研究工作来说，时间分辨率和空间分辨率都是十分重要的，在设计相应的图像处理系统时必须两者兼顾。对于生命科学及工业等领域而言，希望图像处理系统不仅有较高的时间分辨率，还要有较高的空间分辨率。本文提出一种利用多部CCD数码相机、采用移相法获取高分辨牢和高摄录帧率的技术，此技术可应用于普通CCD数码相机组成的复合摄录系统。     

Molecular and biochemical mechanisms ofPasteurella haemolyticaleukotoxin-induced cell death

Pasteurella haemolyticaleukotoxin (LKT) is a member of the RTX family of pore-forming toxins that kill bovine immune cells. Several studies have suggested that RTX toxins kill target cells by the induction of apoptosis. In the present study, BL3 bovine leukaemia cells were exposed to LKT and assessed by molecular and flow cytometric techniques that measure different aspects of apoptotic cell death. The intoxicated cells demonstrated morphological, light scatter and Hoechst 33258 staining characteristics consistent with cells undergoing apoptosis. The cells also exhibited internucleosomal DNA fragmentation and poly (ADP-ribose) polymerase (PARP) cleavage, both indicators of apoptosis. LKT-treated cells bound annexin-V-FITC indicating that phosphatidylserine groups were translocated from the inner to the outer leaflet of the cell membrane. The effect of LKT on cells was dose dependent and inhibitable by incubation with anti-LKT monoclonal antibody. Finally, an early step for induction of apoptosis appears to be the binding of LKT to a β2 integrin since pre-incubating cells with anti-β2 integrin antibodies inhibited LKT-induced apoptosis. This study provides new insights into understanding the pathogenesis of bovine pasteurellosis and could lead to the development of both preventative and therapeutic strategies for disease management.     

A novel lysophospholipid- and pH-sensitive receptor, GPR4, in brain endothelial cells regulates monocyte transmigration.

Abundant evidence documents the highly proinflammatory actions of lysophosphatidylcholine (LPC). Further, LPC, found in high amounts in oxidized low-density lipoprotein (LDL), is implicated as an atherogenic factor. In endothelial cells, LPC impairs endothelial barrier function through GPR4, a novel receptor hypothesized to be sensitive to LPC and protons. The authors investigated the stimulation by LPC or low pH of GPR4 in human brain microvascular endothelial cells (HBMECs) and whether the activated GPR4 regulates in vitro monocyte transmigration. The results indicated that HBMECs stimulated by LPC (5 microM), but not low pH, showed a twofold increase in monocyte transmigration. Using retroviruses containing siRNA to GPR4, a > 60% reduction of GPR4 expression resulted in blockade of the LPC-stimulated transmigration. The inhibited response was restored by co-expression with an small interference RNA (siRNA)-resistant, but functional, GPR4 mutant construct. To investigate potential signaling mechanisms, the siRNA-mediated knockdown of GPR4 also prevented LPC-induced RhoA activation. C3 transferase, a Rho inhibitor, prevented approximately approximately 65% of the LPC-stimulated transmigration. LPC also increased MLC phosphorylation by 5 min, which was inhibited by the Rho kinase inhibitor, Y-27632 (10 microM) or ML-7 (myosin light chain kinase (MLCK) inhibitor). The findings indicate that the proinflammatory and atherogenic LPC stimulated endothelial GPR4, which promoted monocyte transmigration through a RhoA-dependent pathway.     

路氏乳杆菌JCM1081黏附相关蛋白的初步鉴定

目的研究路氏乳杆菌(Lactobacillus reuteri,也称罗伊氏乳杆菌)JCM1081菌体表面蛋白对其黏附HT-29细胞的影响。方法将路氏乳杆菌JCM1081菌体进行胰蛋白酶、蛋白酶K处理;用氯化锂和盐酸胍对乳杆菌表面的蛋白进行抽提,进行SDS-PAGE后与黏蛋白受体进行Western blot,并对杂交阳性蛋白进行质谱分析鉴定。结果路氏乳杆菌JCM1081菌体经胰蛋白酶、蛋白酶K处理后,其对HT-29细胞的黏附力显著下降(P<0．01);用氯化锂去除路氏乳杆菌JCM1081菌体外表面的S层蛋白后,路氏乳杆菌JCM1081对HT-29细胞的黏附力无显著变化;Western blot结果显示相对分子质量(Mr)为29×103和14×103的两种菌体表面蛋白与黏蛋白受体杂交中出现了强阳性;质谱分析结果显示29×103蛋白与路氏乳杆菌ATCC55730的h0793蛋白相似性高达71．1％。结论路氏乳杆菌JCM1081菌体表面的蛋白参与了乳杆菌的黏附,其中29×103和14×103的两种胞壁表面蛋白能够特异地识别黏蛋白受体并与之结合,29×103蛋白属ABC转运蛋白家族。     

Evaluation of recombinant antigen-based assays for diagnosis of bullous autoimmune diseases

The diagnosis of autoimmune bullous diseases is based on clinical observation and on the presence of autoantibodies directed to molecules involved in the adhesion systems of the skin. Immunofluorescence assays are the currently accepted method for detection of autoantibodies; such assays depend greatly on the skill of operators and are difficult to standardize. Recombinant desmoglein-1 (Dsg1), Dsg3, and BP180 peptides, the main autoantigens in pemphigus or bullous pemphigoid, have been used to develop new quantitative enzyme immunoassays (EIA) for the detection of specific antibodies. The present study was undertaken to evaluate the sensitivity and specificity of these immunoassays and to determine the correlation between the results and the clinical aspects of diseases. Serum samples from patients with pemphigus vulgaris, pemphigus foliaceus, bullous pemphigoid, or mucous membrane pemphigoid, from healthy individuals, and from patients with unrelated autoimmune conditions were tested. Anti-desmoglein reactivity was detected in all the patients with pemphigus and in none of the controls. Patients with the more benign form of cutaneous disease had anti-Dsg1 antibodies, while patients with deeper cutaneous lesions or with mucosal involvement had anti-Dsg3 reactivity also, or exclusively. The BP180-based assay was positive for 66.6% of patients with bullous pemphigoid and for none of the patients with mucous membrane pemphigoid, and no reactivity was detected in the control sera. In conclusion, the anti-Dsg1 and anti-Dsg3 assays are useful in the diagnosis of pemphigus and provide information on the clinical phenotype of the disease. However, the sensitivity of EIA for detection of autoantibodies in bullous pemphigoid should be improved by the use of additional antigens or epitopes.     

糖尿病患者膳食营养分析

目的 :探讨糖尿病患者膳食营养状况 ,提出改善糖尿病患者膳食结构的策略。方法 :对 2 2 5例糖尿病患者连续调查 3天膳食供给情况 ,建立数据库输入计算机 ,用SPSS软件进行分析。结果 :热能摄入量不符合要求者占77 3% ;蛋白质供给量不足者占患者总数的 75 6% ;47 6%的糖尿病患者脂肪摄入量超过标准 ;5 5 1%的糖尿病患者碳水化合物的摄入量不符合要求 ;膳食纤维摄入不足者占患者总数的 94 2 % ;维生素和无机盐中 ,除铁、核黄素和抗坏血酸供给量尚可 ,其余均不足。结论 :糖尿病患者膳食是不合理的 ,必须按照膳食治疗方案调节膳食     

舌癌术前化疗PCNA、bcl-2、Bax基因表达及临床意义

目的 :通过舌癌术前化疗增殖细胞核抗原 (PCNA )和细胞凋亡相关基因 bcl- 2、Bax表达的研究 ,探讨舌癌的化疗作用机制。 方法 :对舌乳头状瘤、舌癌和舌癌术前化疗标本共 34例 ,采用免疫组织化学染色技术——酶标链亲和素生物素法 (L SAB)染色并进行光镜下观察。结果:PCNA在舌癌中的表达最强 ,在舌癌术前化疗中的表达明显减弱 (P <0 .0 5 ) ,其与舌乳头状瘤表达相似 (P >0 .0 5 )。 bcl- 2在舌癌术前化疗及舌乳头状瘤中低表达(P >0 .0 5 ) ,舌癌中表达明显增强 (P <0 .0 5 )。Bax在舌癌组和乳头状瘤组中表达有明显差异 (P <0 .0 5 )。结论 :化疗药物抑制肿瘤生长的机制可能与抑制肿瘤细胞增殖和诱导肿瘤细胞程序性死亡有关 ,提示舌癌术前化疗对肿瘤的预后有重要意义。     

口腔修复科进修医师接诊前培训探析

为了提高进修医师的教学质量和医疗水平,我们在2006届进修医师教学工作中加强和细化了进修医师接诊前的培训,取得了良好的效果.实践证明,实施接诊前培训对于提高进修医师的医疗水平和自信心,实施规范化操作,克服诊疗中的盲目性,减少或避免医疗纠纷,进而提高进修医师的教学质量具有重要意义,值得推广和借签.     

Association of Insulin Resistance and Higher Oncotype DX™ Recurrence Score

Annals of Surgical Oncology - Black women with breast cancer have a worse overall survival compared with White women; however, no difference in Oncotype DX? (ODX) recurrence scores has been...     

Characterisation of the IgE-binding immunodominant epitopes on Ara h1

Peanut allergy is one of the most severe food allergies due to its persistency and life-threatening character. Serum IgE from patients with documented peanut hypersensitivity reactions and synthetic peptides were used to screen the linear IgE-binding epitopes on the major peanut allergen, Ara h 1. Five major epitopes that bound peanut-specific serum IgE from more than 60% of patients tested were identified. Mutational analysis of the immunodominant epitope showed that single amino acid changes had dramatic effects on IgE-binding characteristics. Mapping and characterisation of the IgE-binding epitopes on Ara h1 could be used in future immunotherapeutic approaches for peanut allergy disease.