人脑胶质瘤中VEGF 和整合素ανβ3 的表达及相关性研究

 目的 研究血管内皮生长因子(VEGF)和整合素ανβ3(INT ανβ3)在不同病理级别人脑胶质瘤中的表达．并探讨两者之间的关系。方法 采用免疫组化SABC法和图像分析技术检测65倒不同病理级别人脑胶质瘤标本中VEGF和INT ανβ3的表达水平。结果 VEGF在不同级别胶质瘤中表达的平均光密度值(ALD)分别为0．05177±0．019683,0．07399±0．02798和0．09168±0．03671,INT ανβ3在不同级别胶质瘤中表达的平均光密度值(ALD)分别为0．04872±0．01869，0．06065±0．02998和0．08189±0．03953，差异均有显著性意义(P<0．05)．二者的表达水平呈正相关(r=0．835，P<0．01)。结论 VEGF和INT ανβ3在人脑胶质瘤中的表达水平与胶质瘤的恶性程度密切相关，两者之间呈正相关．提示二者在人脑胶质瘤的恶性生物学行为中起重要作用。     

NF-κB和EGFR在不同放射敏感性胶质瘤中的表达

 目的 探讨NF-κB和EGFR的表达水平与胶质瘤放射敏感性的关系。方法 应用免疫组织化学SABC法检测NF-κB p50、p65及EGFR在5例正常脑组织和82例不同放射敏感性胶质瘤中的表达。结果 NF-κBB p50、p65和EGFR在正常脑组织中均未见表达。髓母细胞瘤、室管膜瘤、少枝胶质细胞瘤、低(Ⅰ～Ⅱ级)及高级别(Ⅲ～Ⅳ级)星形细胞瘤、多形性胶质母细胞瘤的NF-κB和EGFR表达率呈依次上升趋势。对放疗最敏感的髓母细胞瘤表达率与其他各组均有显著性差异(P<0．05)。结论 NF-κB和EGFR表达水平与胶质瘤的不同放射敏感性可能相关。     

大明胶囊对糖尿病大鼠心肌L型Ca~(2+)通道蛋白mRNA表达的影响

目的探讨大明胶囊对2型糖尿病大鼠心肌L型Ca2+通道蛋白mRNA表达的影响。方法建立2型糖尿病大鼠模型,筛选空腹血糖值大于16.7mmol·L-1的大鼠随机分组:大明胶囊大(200mg·kg-1·d-1)、中(100mg·kg-1·d-1)、小(50mg·kg-1·d-1)剂量组、糖尿病模型组、苯乙双胍(75mg·kg-1·d-1)组,连续用药14d,用快速血糖仪测空腹血糖值。提取心肌总RNA,采用逆转录聚合酶链式反应(RTPCR)的方法,观察大明胶囊治疗后2型糖尿病大鼠心肌L型Ca2+通道蛋白mRNA水平的变化。结果2型糖尿病组大鼠心肌L型Ca2+通道蛋白mRNA表达高于正常组大鼠(P<0.01),经大明胶囊治疗后的心肌L型Ca2+通道蛋白mRNA表达降低(P<0.05),空腹血糖也明显下降。结论大明胶囊对2型糖尿病大鼠有明显的降糖作用,并且可以降低2型糖尿病大鼠心肌L型Ca2+通道蛋白mRNA的表达。     

The experience of application of peritoneal dialysis in cardiosurgery of an early age children

The experience of the peritoneal dialysis (PD) successful application in 16 children of an early age was summarized. In all the patients the terminal state with an acute cardiac and renal insufficiency was noted after cardiosurgical operation conduction using artificial blood circulation. The improvement of hemodynamical indices, renal and pulmonary function as well, were promoted by an early application of PD.     

牛磺酸对脑挫伤大鼠氧应激与Ca~(2+)超载损伤的影响

目的 :探讨牛磺酸对大鼠脑挫伤导致的氧应激和细胞Ca2 + 超载损伤的影响。方法 :将SD大鼠随机分为正常对照组、脑挫伤模型组、牛磺酸 (高、中、低剂量 )治疗组与尼莫地平组。在给药7d后进行脑挫伤造模 ,造模后2h切取活体脑片以荧光标记法测定胞内Ca2 +水平 ;造模后24h分离大鼠患侧大脑皮层 ,以比色法测定脑匀浆中超氧化物歧化酶 (SOD )活性与丙二醛 (MDA )含量。结果 :与模型组比较 ,牛磺酸各剂量组皮层胞内Ca2 + 、MDA水平显著降低 ,高剂量牛磺酸组皮层SOD水平显著升高。结论 :牛磺酸对大鼠脑挫伤导致的氧应激和细胞Ca2 +超载损伤有较好的保护作用。     

PRIMUS型加速器59#pres/temp联锁分析处理与质控

本文旨在针对西门子PRIMUS型加速器59#pres/temp联锁进行分析处理,并介绍排除联锁故障的方法;针对此故障可能对加速器电子线剂量的影响,严格遵守质量控制（QC）和质量保证（QA）的要求,进行电子线剂量校准测量。     

Induction of fat cell necrosis in human fat tissue after treatment with phosphatidylcholine and deoxycholate

Background Injections with phosphatidylcholine‐ and deoxycholate‐containing substances are used to treat localized fat accumulation and lipomas. It is believed that the injected substances induce fat cell destruction with subsequent acute panniculitis followed by a repair process of the treated fat tissue. Objectives We investigated whether necrosis or apoptosis of fat cells was induced by the injected substances. Methods Samples of fat tissue of lipoma were collected at various times after injection and evaluated by light and electron microscopy, by immunostaining for active caspase‐3 and antideoxyribonuclease I, in situ end‐labelling (TUNEL staining), and biochemical caspase‐3 assays. Results Light and electron microscopy showed fat cell necrosis in all areas of the treated lipomas. Low levels of active caspase‐3 indicated the absence of apoptosis. Conclusions Injection of the lipolytic substances phosphatidylcholine and deoxycholate leads to fat cell necrosis rather than apoptosis. However, additional studies evaluating different dosing and further time points after treatment are necessary.     

内镜柔性器械腱鞘传动模型及实验研究

目的 建立内镜柔性器械腱鞘系统的推力传动模型，研究影响传动效率的关键因素。方法 建立腱鞘系统在器械推送作用下力和位移的传动模型并进行仿真计算；搭建腱鞘系统传动测试的实验平台以验证模型的准确性，研究传动速度、腱鞘直径比、弯曲半径等对传动效率的影响。结果 腱鞘传动过程中存在显著的非线性传递现象，传动模型仿真与实验结果基本符合；传动速度、腱鞘直径比、弯曲半径均对内镜柔性器械的推力传动有较大影响，对位移传动的影响相对小一些。结论 该模型可用于内镜柔性器械中腱鞘系统推力传动的计算，提供给医生器械工作末端的力反馈，以保证器械的安全操作和提高手术效果；在内镜柔性器械的精准控制中需要综合考虑传动速度、腱鞘传动比、弯曲半径等对运动传递的影响。     

Effect of Simulation-Based Training and Neurofeedback Interventions on Radiation Technologists’ Workload,Situation Awareness,and Performance

PurposeOur purpose was to assess the effect of a combined intervention – simulation-based training supported by neurofeedback sessions – on radiation technologists’ (RTs’) workload, situation awareness, and performance during routine quality assurance and treatment delivery tasks.Methods and MaterialsAs part of a prospective institutional review board approved study, 32 RTs previously randomized to receive versus not receive simulation-based training focused on patient safety were again randomized to receive versus not receive a 3-week neurofeedback intervention (8 sessions of alpha-theta protocol) focused on stress reduction as well as conscious precision, strong focus, and ability to solve arising problems. Perceived workload was quantified using the NASA Task Load Index. Situation awareness was quantified using the situation awareness rating technique. Performance score was calculated using procedural compliance with time-out components and error detection.ResultsRTs randomized to simulation-based training followed by neurofeedback sessions demonstrated no significant changes in perceived workload or situation awareness scores, but did have better performance compared with other study groups (P < .01).ConclusionsThis finding is encouraging and provides basis for using neurofeedback as means to possibly augment performance improvements gained during simulation-based training.