基于GPRS网络的心电采集仪的通信系统设计

利用现行GPRS网络将便携式心电设备无线接入Internet,再将采集的心电数据上传到心电诊断服务器,设计一心电采集通信系统。硬件上系统采用Atmel公司的AT91SAM7SE5 12做MPU、SIEMENS公司的MC55做GPRS通讯模块。软件功能在嵌入式实时操作系统μCOS以及图形界面μCGUI下编程实现,选择TCP／IP协议进行通信。最终系统可以实现心电数据的实时采集与本地显示、本地存储,并可以选择通过无线网络上传给诊断服务器,以短消息的形式接受服务器下发的诊断结果。     

重组可溶性MHC Ⅰ类相关蛋白A对NK细胞生物学活性的影响

目的:研究体外重组可溶性MHC Ⅰ类相关蛋白A(sMICA)对NK细胞杀伤靶细胞活性、分泌IFN-γ、增殖和凋亡的影响.方法:将重组sMICA蛋白与人外周血NK细胞相互作用过夜后,流式细胞仪检测NK细胞杀伤K562靶细胞的能力;ELISA检测培养上清IFN-γ浓度;MTS/PMS法检测sMICA对NK细胞增殖的影响;给NK细胞标记Annexin V和碘化丙啶检测凋亡情况.结果:可溶性MICA抑制NK细胞杀伤K562细胞的活性,下调IFN-γ的分泌,却对NK细胞的增殖和凋亡没有影响.结论:肿瘤细胞表面脱落的sMICA抗原可通过抑制NK细胞活性而逃逸机体的免疫监视功能.     

The temporal course of the influence of anxiety on fairness considerations

This study investigated the potential causes of anxious people's social avoidance. The classic ultimatum game was utilized in concert with electroencephalogram recording. Participants were divided into two groups according to levels of trait anxiety as identified by a self‐report scale. The behavioral results indicate that high‐anxious participants were more prone to reject human‐proposed than computer‐proposed unequal offers compared to their low‐anxious counterparts. The event‐related potential results indicate that the high‐anxious group showed a larger feedback‐related negativity when receiving unequal monetary offers than equal ones, and a larger P3 when receiving human‐proposed offers than computer‐proposed ones, but these effects were absent in the low‐anxious group. We suggest anxious people's social avoidance results from hypersensitivity to unequal distributions during interpersonal interactions.     

Biological and genomic analysis of a PBSX-like defective phage induced from Bacillus pumilus AB94180

Defective prophages, which are found in the genomes of many bacteria, are unable to complete a viral replication cycle and propagate in their hosts as healthy prophages. They package random DNA fragments derived from various sites of the host chromosome instead of their own genomes. In this study, we characterized a defective phage, PBP180, which was induced from Bacillus pumilus AB94180 by treatment with mitomycin C. Electron microscopy showed that the PBP180 particle has a head with a hexagonal outline of ~40 nm in diameter and a long tail. The DNA packaged in the PBP180 head consists of 8-kb DNA fragments from random portions of the host chromosome. The head and tail proteins of the PBP180 particle consist of four major proteins of approximately 49, 33, 16 and 14 kDa. The protein profile of PBP180 is different from that of PBSX, a well-known defective phage induced from Bacillus subtilis 168. A killing activity test against two susceptible strains each of B. subtilis and B. pumilus showed that the defective particles of PBP180 killed three strains other than its own host, B. pumilus AB94180, differing from the host-killing ranges of the defective phages PBSX, PBSZ (induced from B. subtilis W23), and PBSX4 (induced from B. pumilus AB94044). The genome of the PBP180 prophage, which is integrated in the B. pumilus AB94180 chromosome, is 28,205 bp in length, with 40 predicted open reading frames (ORFs). Further genomic comparison of prophages PBP180, PBSX, PBSZ and other PBSX-like prophage elements in B. pumilus strains revealed that their overall architectures are similar, but significant low homology exists in ORF29-ORF38, which presumably encode tail fiber proteins involved in recognition and killing of susceptible strains.     

基于3D人脸数据库的儿童面部发育评估

研究发现,患有遗传性疾病的人脸常伴有面部发育异常的问题,如患有威廉姆斯综合征（WS）和唐氏综合征（DS）的人脸。为此,对儿童面部发育的研究有助于遗传性疾病的早筛查与早诊断。基于目前国内还没有儿童3D人脸数据库的现状,通过3dMDface人脸采集系统,采集人脸5 600例,对原始数据进行预处理使人脸稠密对应,从而构建3D人脸数据库。利用人体测量学标定面部各器官的关键点,建立标准测量指标,建立儿童面部发育评估系统。其中,对浙江地区分别患有DS的人脸55例和患有WS的人脸30例的19项测量指标与正常人脸比较分析。结果发现,DS人脸两眼内宽分布在第90百分位以上的样本为763%,鼻长分布在第10百分位以下的样本为618%,耳长分布在第10百分位以下的样本为872%,上面深分布在第10百分位以下的样本为89%,颅面变异指数为1630～2117,T检验分析为T=10130,P=.000;WS人脸鼻宽与口裂宽分布在第75百分位以上的样本分别为50%和667%,而两耳屏间宽分布在第25百分位以下的样本为633%,颅面变异指数为1714～2365,T检验分析为T=12213,P=.000。这表明,该两种特殊人脸与正常人脸差异具有明显的统计学意义。因此,利用该评估系统能正确反映患有遗传性疾病特殊人脸的显著性特征,基于3D人脸数据库建立的面部发育评估系统对儿童生长发育及面部异常的评价具有临床应用价值。     

五厂家EB病毒抗体检测试剂盒血清学诊断鼻咽癌的比较

目的 通过比较EB病毒抗体检测试剂盒血清学诊断鼻咽癌的准确性和检测结果的一致性,为试剂盒在临床上的使用选择和性能改进提供依据.方法 使用五厂家的EB病毒衣壳抗原IgA和IgG抗体检测试剂盒（VCA IgA和VCA IgG试剂盒）、核抗原I IgA和IgG抗体检测试剂盒（EBNA1 IgA和EBNA1IgG试剂盒）、早期抗原IgA和IgG抗体检测试剂盒（EA IgA和EA IgG试剂盒）以及Zta IgA抗体检测试剂盒,分别检测33例鼻咽癌患者（NPC）、30例健康体检者（HD）和41例非鼻咽癌的其他肿瘤患者（NNPC）血清或血浆样本.结果 A厂家的VCA IgA试剂盒灵敏度高于其他厂家同品种试剂盒,但对于NNPC特异度最低（36.6％）;而D厂家VCA IgA试剂盒的特异度最高（97.6％）,且对HD的特异度均大于90％.B和D厂家的EBNA1 IgA试剂盒间阳性、阴性符合率分别为92.1％和100.0％.A和E厂家的EA IgA试剂盒的灵敏度均较低而特异度高,试剂盒间阳性符合率低（39.4％）,阴性符合率高（98.6％）;而VCA IgG试剂盒的灵敏度高但特异度低.A和C厂家的EBNA1IgG试剂盒的灵敏度高（100.0％,97.0％）但特异度低（3.3％,13.3％）.C厂家EA IgG试剂盒检测所有样本结果均为阴性.结论 五个不同厂家VCA LgA、EA IgA试剂盒诊断鼻咽癌的准确性和检测结果的一致性存在差异,特别是A厂家和其他国内厂家同品种试剂间差异明显,需根据临床目的进行选择.三家国产VCA IgA试剂盒的灵敏度需进一步提高.相反,EBNA IgA试剂盒诊断鼻咽癌的准确性和结果一致性较好.单独使用VCA IgG和EBNA1 IgG试剂盒血清学诊断鼻咽癌的特异度差,其判读界值可能需根据检测且的进行调整.     

辣椒素受体介导氯喹引起的搔痒

目的研究辣椒素受体（VR1）在氯喹引起搔痒中的作用及机制。方法实验分4个部分,分别研究辣椒素受体拮抗剂辣椒平腹腔注射、局部应用辣椒素使VR1脱敏感、局部注射PKA抑制剂H89或PKC抑制剂bisindolylmaleimide Ⅰ、重复肥大细胞脱颗粒后颈背部注射氯喹200μg／100μl 30min内引起搔痒的次数,分为9小组,共使用6周龄C57BL／6J雄性小鼠63只。结果腹腔内注射辣椒平、局部应用辣椒素与重复肥大细胞脱颗粒均明显抑制氯喹引起的搔痒,而H89与BIM对氯喹引起的搔痒均无明显作用。结论氯喹通过肥大细胞脱颗粒引起搔痒,而辣椒素受体介导了氯喹引起的搔痒。     

人巨细胞病毒UL143基因在临床低传代分离株中的多态性研究

目的 探讨人巨细胞病毒(human eytomegalovirus,HCMV)UL143序列在临床患儿低传代分离株中的多态性及其与临床疾病的关系.方法 对19株HCMV临床低传代分离株进行HCMV-UL143 PCR扩增分析及伞序列测定分析.结果 19株HCMV感染患儿临床分离株均因碱基插入造成移码突变,开放阅读框架(ORF)比Toledo株短.根据序列变异情况可将19个序列分为2组,第1组16个序列新增一个MYRISTYL位点;缺失2个PKC磷酸化位点.未发现黄疸、小头畸形、先天性巨结肠等不同疾病类型的序列之间的差异.结论 HCMV-UL143较多存在于临床低传代分离株中,序列呈现一定多态性.