In situ preparation of Ag nanoparticles on silicon wafer as highly sensitive SERS substrate

An intensive surface enhanced Raman scattering (SERS) effect is realized by ordered Ag nanoparticles (NPs) in situ grown on silicon wafer directly using (3-aminopropyl) trimethoxysilane (APS) as both the surface modifier and reducing agent. The as-prepared ordered Ag NPs based SERS substrate shows excellent performance in detecting glycerin (an important integration in liquid super lubricating system) as well as conventional Rhodamine 6G (R6G, a kind of dye organic pollutant). The enhancement factor (EF) achieves 4-fold for glycerin and 10-fold for R6G (allowing for detecting as low as 10⁻¹¹ M aqueous R6G), confirming the high sensitivity. The limited relative standard deviations (RSD) of the enhancement factors are within 15% for both glycerin and R6G, indicating the excellent uniformity. This remarkable progress is ascribed to the advantages of APS in improving adsorption and modulating distribution of Ag NPs on silicon, which results in a large local electric field to enhance the Raman signals. The SEM and UV-visible absorption spectrum characterization verified the contribution of APS in SERS improvement by investigating the influence of APS content and reduction time during the preparation process. All these advances imply that the SERS substrates prepared by Ag NPs in situ grown on silicon wafer have great potential application in real-time interface state tracing and sensitive detection.

An intensive surface enhanced Raman scattering (SERS) effect is realized by ordered Ag nanoparticles (NPs) in situ grown on silicon wafer directly using (3-aminopropyl) trimethoxysilane (APS) as both the surface modifier and reducing agent.     

永存原始三叉动脉供血颈动脉-海绵窦瘘1例北大核心CSCD

1临床资料患者女,51岁。因“左侧头部及面部搏动性疼痛伴头晕、耳鸣2个月”入院。患者既往身体健康,查体可闻及左侧眼球后搏动性血管杂音,左侧眼球突出伴球结膜水肿。患者入院后行全脑血管造影见左侧永存原始三叉动脉供血的颈动脉-海绵窦瘘(carotid-cavernous sinus fistula,CCF),原始三叉动脉两端分别与左侧颈内动脉海绵窦段及左侧小脑上动脉相连,左侧小脑上动脉远端未见显影,主要经眼上静脉、岩上窦、基底窦、直窦引流(图1)。     

Neferine Inhibits the Upregulation of CCL5 and CCR5 in Vascular Endothelial Cells During Chronic High Glucose Treatment

We investigated whether the expressions of CCL5 and CCR5 participate in dysfunctional changes in human umbilical vein endothelial cells (HUVECs) induced by chronic high glucose treatment and examined whether neferine exerts its therapeutic effects by blocking the development of dysfunctional vascular endothelium. HUVECs were cultured with control or high concentrations of glucose in the absence or presence of neferine for 5 days. Nitric acid reductase method was used to detect the concentration of nitric oxide (NO) released into culture media. The level of intracellular reactive oxygen species (ROS) was measured by fluorescent DCFH-DA probe. The expressions of 84 genes related to endothelial cell biology were assessed by Human Endothelial Cell Biology RT² Profiler PCR Array. The expressions of the chemokine CCL5 and its receptor CCR5 were further determined by real-time RT-PCR and western blotting. PCR array indicated that CCL5 was the most significantly upregulated when HUVECs were exposed to chronic high glucose; the intracellular ROS level and the expressions of CCL5 and CCR5 at both mRNA and protein levels were significantly increased, whereas NO production was decreased simultaneously. The increased level of ROS and elevated expressions of CCL5 and CCR5 at high glucose were significantly inhibited by neferine; meanwhile the decreased NO production upon chronic high glucose treatment was relieved. An antioxidant (vitamin E) exerted similar beneficial effects. These data indicate that neferine can reduce the upregulation of CCL5 and CCR5 of vascular endothelium exposure to chronic high glucose and prevent or inhibit subsequent occurrence of inflammation in blood vessels possibly through antioxidation.     

颏下、下颌下巨大表皮样囊肿1例

表皮样囊肿少发于颏下、下颌下区,病灶大小不一,巨大者少见.本文报道1例颏下、下颌下巨大表皮样囊肿,并复习相关文献,对其诊断、治疗及发生原因进行探讨.     

长期石料加工从业人员的肺功能损害分析

目的：分析长期石料加工从业人员的肺功能损害发生情况，了解石料加工者避免肺功能损害的措施。方法：一组选择湿式作业者149名，其中不同吸烟指数者119例，不吸烟者者30例为对照组；另一组选择同一区域不吸烟者168名，其中石料加工者130例为研究对象，不从事石料加工的健康农民38例为对照者。采用IOS脉冲振荡肺功能检测仪，采用非备件Logis—tic回归模型对影响因素进行分析。结果：不同吸烟指数湿式作业方式组FVC、FEV。实测值与其预测值的比值均明显低于对照组，差异有统计学意义（P〈0．05）；石料加工者作业方式的发生肺功能损害的风险及程度也不同；干式作业者，限制性和混合性通气功能损害发生率明显增高（x^2=67．46，51．19，P％0．05）。结论：不同吸烟指数与对照组相比，石料加工者发生肺功能损害的程度及风险随吸烟指数的增加而增加；不同作业方式与对照者相比，干式作业较湿式作业造成肺功能损害的程度明显增加。     

长安郭氏“循经取穴”冲击波治疗膝关节骨性关节炎临床研究

目的:探讨长安郭氏“循经取穴”冲击波治疗膝关节骨性关节炎的临床疗效。方法:选取96例膝关节骨性关节炎患者,依照随机数字表法分为对照组和观察组,每组48例。对照组采用塞来昔布治疗,观察组采用循经取穴冲击波联合塞来昔布治疗,两组治疗时间均为3个月。结果:治疗后两组中医症状评分均降低,且观察组低于对照组; 治疗后两组膝关节功能评分均增高,且观察组高于对照组(均P<0.05)。治疗后观察组总有效率高于对照组(P<0.05)。治疗后两组关节液白细胞介素-1β(IL-1β)、肿瘤坏死因子-α(TNF-α)、基质金属蛋白酶-3(MMP-3)水平均降低,且观察组低于对照组(均P<0.05)。治疗期间两组不良反应发生率比较,差异无统计学意义(P>0.05)。结论:长安郭氏“循经取穴”冲击波联合塞来昔布治疗膝关节骨性关节炎能够改善患者临床症状及膝关节功能,抑制炎症反应,疗效较好。     

新疆艾比湖布尼亚病毒的分离与分子生物学鉴定

目的 发现新疆艾比湖地区潜在流行的蚊媒病毒。方法 采用接种敏感宿主细胞法分离培养病毒;利用反转录聚合酶链和序列聚类分析对病毒株种属进行分子生物学鉴定。结果 从当地优势蚊种凶小库蚊（36.6%）中分离获得一株引起BHK-21细胞病变的病毒,分子生物学鉴定表明该病毒属于布尼亚科正布尼亚属（Orthobunyavirus,Bunyaviridae）成员,暂定名为艾比湖布尼亚病毒。RT-PCR扩增进一步获得长为651 bp和980 bp的病毒基因组S、M节段的部分序列,对上述序列的比对分析显示艾比湖布尼亚病毒与分离自南非的Germiston布尼亚病毒同源关系最为接近,S节段核苷酸和氨基酸序列似然率分别为90.6%和95.0%。M节段变异性高,核苷酸和氨基酸序列似然率仅为78.6%和86.1%。结论 艾比湖布尼亚病毒是国内新发现的一株蚊媒布尼亚病毒。