Small bowel complication caused by magnetic foreign body ingestion of children: two case reports

Accidental ingestion of foreign bodies is a common pediatric problem. The majority of such cases occur between 6 months and 3 years. When several magnets are ingested, they can be attracted to each other through the intestinal wall, causing necrosis and intestinal perforation or fistula, so they should be removed while they are still in the stomach. The authors experienced 2 cases of unusual small bowel complication caused by the ingestion of magnets. The first case was in a 10-month-old boy with ileal perforation caused by to 2 ingested magnetic beads, and the second case was in a 22-month-old boy with ileo-ileal fistula caused by to 7 ingested magnetic beads.     

铜绿假单胞菌大鼠肺部感染模型的建立

目的 评价铜绿假单胞菌接种至大鼠肺部感染模型的建立。方法 Sprague-Dawley大鼠200只分为2组：铜绿假单胞菌感染组与对照组;应用锐孔喷射装置制成铜绿假单胞菌藻酸盐包裹体凝胶小珠,接种至大鼠肺部,接种后3、7、14、28 d观察变化。结果 细菌学：感染组大鼠肺组织匀浆菌落计数在感染后3、7 d均〉10^5CFU/g,在感染后14、28 d均〉10^3CFU/g;病理学：接种后37、d,感染动物肺组织均有脓肿、实变、水肿,镜下可见中性粒细胞聚集在藻酸盐包被体周围形成脓肿,接种后14、28 d,以纤维增生、肉芽肿形成为主要表现。结论 使用锐孔喷射装置制成铜绿假单胞菌藻酸盐包裹体凝胶小珠,接种至大鼠肺部,可成功建立大鼠肺部感染模型。     

Morphology of rabbit retinal ganglion cells projecting to the medial terminal nucleus of the accessory optic system

Rabbit retinal ganglion cells were retrogradely labeled following injection of rhodamine-labeled microspheres into the medial terminal nucleus. The small fraction of rhodamine-labeled neurons reached their peak concentration within the visual streak and then decreased with increasing eccentricity until none were encountered in the far periphery. The same rabbits also received injections of the fluorescent tracer Fast Blue into the superior colliculus. No double-labeled neurons were observed, i.e., ganglion cells projecting to the medial terminal nucleus (MTN) had no axon collaterals to the superior colliculus. In fixed retinae rhodamine-labeled ganglion cells were intracellularly injected with the fluorescent dye Lucifer Yellow to reveal their full dendritic arborization. MTN-projecting cells had medium-sized to large somata with thin and frequently branched dendrites. The large dendritic trees had a distinct morphology and were predominantly unistratified in a narrow band that presumably corresponded to the electrophysiologically determined on-sublamina of the inner plexiform layer. Dendritic field sizes were inversely related to ganglion cell density, thus providing an eccentricity-independent, constant dendritic coverage factor. Approximately five to six dendritic fields from neighboring cells cover every point of the retina. Published reports claim that the physiological class of on-direction-selective ganglion cells provides the sole retinal input to the MTN in the rabbit. In this context morphological features of MTN-projecting cells and their presumed functional correlation with on-direction-selective ganglion cells are discussed.     

Immunomagnetic separation of antibody-labelled from antibody-free human spermatozoa as a treatment for immunologic infertility. A preliminary report

A method is described where superparamagnetic polymer microspheres coated with monoclonal antibodies are used to isolate antibody-labelled from antibody-free spermatozoa in male autoimmune infertility. Autoimmune sperm samples or antibody-free spermatozoa adsorbed with antisperm-antibodies from sera were incubated with microspheres coated with a specific monoclonal antibody to murine immunoglobulins, after their preincubation with mouse anti-human IgG and IgA. Using a magnet, the microsphere-labelled spermatozoa were separated from the samples. Immunobead binding was performed before and after the treatment in order to detect changes in the percentage of antibody-bound spermatozoa. After the immunomagnetic separation, approximately 50% of the IgA-labelled spermatozoa was isolated while no difference was demonstrated when antisperm antibodies of IgG class were involved. The evaluation of sperm motility and membrane integrity after treatment seemed to indicate that the technique did not have any relevant effect on sperm characteristics. The fact that only a partial success in separation of IgA-bound spermatozoa and no success for IgG-labelled sperm was obtained indicates that the method needs to be improved before its clinical utilization might be postulated.     

磁珠双阳性分选法在阵发性睡眠性血红蛋白尿症患者骨髓CD34+CD59+细胞体外扩增的应用

应用磁珠双阳性分选法在体外扩增阵发性睡眠性血红蛋白尿症(PNH)患的CD34 CD59 细胞，为实现PNH患进行临床自体骨髓移植(ABMT)或自体外周血干细胞移植(APBSCT)奠定基础。流式细胞术分选虽然经常用于细胞纯化，但难于满足大规模临床细胞分选的需要。本研究利用免疫磁珠系统，应用隔夜孵育法去除第一次分选时CD34 细胞吸附的磁珠，经过两次磁珠双阳性分选，从PNH患骨髓中分离出足够数量的CD34 CD59 细胞，用于体外培养扩增。结果显示：磁珠双阳性法分选的CD34 CD59 细胞与磁珠—流式细胞术二步分选法比较，在细胞生存、增殖、扩增及形成造血集落形成单位(CFU)的能力上均无显性差异。结论：磁珠双阳性分选法可能推广应用于其它双阳性或多阳性细胞的分离纯化，尤其是造血干／祖细胞的分离纯化。     

免疫磁性分选系统大量分选CD34+细胞的实验研究

CD3 4 细胞的分离纯化在自体外周血干细胞、异基因骨髓移植 /外周血干细胞移植及干细胞研究中具有重要的应用价值。为了摸索大量分选CD3 4 细胞的方法 ,本研究应用Isolex3 0 0i磁性分选系统富集CD3 4 细胞 ,采用流式细胞术监测分选前后细胞表面标志 ,经CD3 4 细胞体外增殖实验及克隆形成实验验证分选获得的CD3 4 细胞生物学活性。结果显示 ,所完成的 5例次自体外周血富集CD3 4 细胞时 ,先收获单个核细胞约 ( 3 .5 -6.0 )× 10 10 ,CD3 4 细胞占单个核细胞百分率为 ( 0 .5 5 - 1.2 ) % ;收获的CD3 4 阳性细胞总数为 ( 2 - 3 )× 10 8,纯度为 ( 75 - 85 ) % ,回收率为 ( 4 0 - 65 ) %。体外实验表明 ,在SCF IL 3 FL TPO EPO存在下 ,经过 3 - 4天培养 ,可扩增 2 - 3倍 ;经CFU GM、BFU E集落形成实验显示具有形成集落的能力 ,证实分选后细胞具有造血祖细胞生物活性。结论 :应用Isolex3 0 0iCD3 4 细胞分选仪可以高效大量富集CD3 4 细胞 ,适于临床应用。     

两种从陈旧血中抽提基因组DNA方法的比较

目的比较盐析法和磁珠法从陈旧血中抽提基因组DNA的效果和特点,以便常规用于骨髓库HLA基因分型。方法使用TECAN全自动工作站为平台,分别用Gentra盐析法DNA抽提试剂盒和Promega磁珠法DNA抽提试剂,从48份陈旧全血样本中抽提基因组DNA,提取的基因组DNA均溶于100μlTE中;然后用紫外分光光度计测定其产量和纯度,并用琼脂糖凝胶电泳法测定DNA样本的完整性。结果从400μl陈旧全血中提取基因组DNA,用盐析法获得的DNA含量为28.6±8.7ng/μl,A260/A280值平均为1.63±0.209;用磁珠法获得的DNA含量为94.2±10.3ng/μl,A260-A320/A280-A320值平均为1.821±0.102;琼脂糖电泳法检测表明两种方法提取的DNA的分子量均大于15kb。结论使用磁珠法从陈旧血中所获得的DNA的产量和纯度明显高于盐析法,适合于骨髓资料库陈旧血样本的常规HLA基因分型实验以及下游的分子生物学实验。     

CalliSpheres载药微球子宫动脉栓塞术治疗宫颈癌的疗效评价

目的　评价CalliSpheres载药微球子宫动脉栓塞术治疗局部晚期宫颈癌疗效。 方法　选取2016年2月至2018年9月本介入科收治的宫颈癌患者48例（平均年龄49岁）,采用随机数字分配法将患者分为普通微球子宫动脉栓塞+表阿霉素子宫动脉灌注化疗组24例（A组）,表阿霉素载药微球子宫动脉栓塞化疗组24例（B组）。每组治疗2个周期,间隔3周。记录出血减少情况,以CT评价肿瘤大小变化,分析骨髓抑制及消化道反应。 结果　（1）两组患者阴道出血均减少;普通微球组术后出血持续时间为（6±1.5）d,载药微球组为（3± 0.8）d,差异有统计学意义,P<0.01。（2）肿瘤缩小率：普通微球组客观缓解率为83.8%,载药微球组为95.8%,差异有统计学意义,P<0.01。（3）副反应：两组患者均出现腹痛,VAS评分普通微球组（8±2）分,载药微球组（3±1）分,差异有统计学意义,P<0.01;骨髓抑制仅发生于普通微球组。 结论　CalliSpheres载药微球治疗宫颈癌较传统的化疗栓塞术具有更高的肿瘤缩小率,术后阴道出血时间更短,无骨髓抑制且腹痛可控。     

Percoll分离法结合免疫磁珠法分离提纯人外周血中性粒细胞方法的建立

目的:探讨采用Percoll分离法结合免疫磁珠负性筛选法分离人外周血中性粒细胞的可行性.方法:采用台盼蓝染色观察活力,流式细胞仪检测荧光标记的CD62L表达阳性率.结果:分选后CD62L表达阳性细胞纯度达(95.5±2.2)％,细胞活力为(98.8±2.7)％.结论:Percoll分离法结合免疫磁珠负性筛选法分选系统提纯人外周血中性粒细胞,细胞纯度高并对细胞的生物活性无明显影响,是一种更加有效的人外周血中性粒细胞分离提纯方法.     

一种基于NASBA技术的新型快速肠道病毒检测方法的应用研究

目的: 基于核酸等温扩增技术(nucleic acid sequence-based amplification,NASBA)荧光分子信标探针检测技术,进行肠道病毒的快速检测与辅助诊断?方法:根据Genebank上肠道病毒5′端非编码区序列,设计特异性引物与捕获探针,应用纳米技术对商品化磁珠进行偶联,NASBA方法进行扩增,NucliSens读数仪检测,荧光定量RT-PCR方法进行验证,同时验证NASBA方法的特异性?灵敏度和重复性?结果:该方法对肠道病毒具有高度特异性,与RSV等呼吸道相关病毒均无交叉反应,反应体系具有很高的稳定性?结论:本研究应用的肠道病毒NASBA检测方法特异?灵敏?快速简便,适用于肠道病毒的日常监测和爆发疫情的应急诊断?