呼吸机动力学参数监测模块设计

针对目前大多数小型呼吸机中呼吸动力学参数监测模块功能较弱的现状，采用新型传感器和基于ARM核的微处理器，设计了一种新型呼吸机动力学参数监测模块。该模块提高了呼吸动力学参数检测的精度，满足了实时监测的需要。通过使用USB接口，既提供了模块供电电源又实现了即插即用功能，控制系统通过USB接口可实时设置测量模块各种参数，对测量功能进行灵活配置。测试结果表明该模块适用于呼吸机及ICU病房中呼吸动力学参数的监测。     

乳腺癌细胞中PNRC基因启动子区CpG岛甲基化状态的研究

目的 研究乳腺癌细胞中富含脯氨酸核受体辅活化子(proline-rich nuclear receptor coactivator protein,PNRC)基因启动子CpG岛的甲基化状态及在PNRC转录调节中的作用.方法 应用PT-PCR检测PNRC基因在正常乳腺细胞与乳腺癌细胞中的表达情况,并运用"MethPrimer"软件对PNRC启动子区进行分析,预测CpG岛,通过甲基化特异性PCR(methylation-specific PCR,MSP)检测PNRC启动子区CpG岛的甲基化状况;PT-PCR及Northern杂交检测乳腺癌细胞经甲基转移酶抑制剂5-氮杂-2'-脱氧胞苷(5-aza-2'-deoxycytidine,5-Aza-dc)作用后,PNRC基因mRNA的表达情况;Westernblot检测5-Aza-dc干预对PNRC蛋白表达的影响;将含PNRC启动子序列的报告质粒转染乳腺癌细胞,再经5-Aza-dc处理后,检测PNRC基因启动子的活性.结果 PNRC基因在乳腺癌细胞中的表达较正常乳腺细胞明显降低;乳腺癌细胞PNRC基因启动子区存在CpG岛甲基化;乳腺癌细胞经5-Aza-dc处理后,PNRC基因mRNA及蛋白表达水平显著增加,其PNRC基因启动子的活性也明显增强.结论 PNRC基因启动子区的高甲基化导致PNRC在乳腺癌细胞中表达降低.     

乳腺癌雌激素受体α基因启动子甲基化与其蛋白表达的关系

目的：检测乳腺癌雌激素受体α（estrogen receptor α,ERα）基因启动子区CpG岛甲基化状态,探讨乳腺癌ERα启动子甲基化与其蛋白表达及临床病理的关系。方法：采用免疫组化EnVisionTM二步法检测20例正常乳腺组织、44例乳腺癌组织ERα基因的表达,同时运用甲基化特异性PCR（Methylation-Specific PCR,MSP）及测序法分别检测ERα基因启动子A区和B区CpG岛的甲基化状态。结果：32例ERα阳性乳腺癌组织中,ERα启动子A区、B区甲基化率分别为28.2%和18.8%。12例ERα阴性乳腺癌组织中,ERα启动子A区、B区甲基化率分别为66.7%和58.3%。ERα阳性乳腺癌组、ERα阴性乳腺癌组、乳腺癌组的ERα启动子A、B区甲基化率均较正常组显著增高（P〈0.05）;ERα阴性乳腺癌组的ERα启动子A、B区甲基化率较ERα阳性乳腺癌组均显著增高（P〈0.05）。乳腺癌组织ERα表达与启动子区甲基化之间呈显著负相关。结论：乳腺癌组织ERα基因表达沉默与其启动子A区、B区CpG岛甲基化相关,后者有可能成为乳腺癌预后不良的分子检测指标。     

慢性淋巴细胞性白血病患者miR-9-3甲基化异常及其意义

目的本研究旨在探讨microRNA-9-3(miR-9-3)在慢性淋巴细胞性白血病骨髓细胞中的甲基化异常及其意义。方法采用甲基化特异性聚合酶链反应(MSP)技术检测8例正常骨髓组织、78例新确诊的慢性淋巴细胞性白血病患者和7种白血病细胞株甲基化水平。结果正常对照组miR-9-3呈未甲基化状态;7种白血病细胞株中有5种呈未甲基化状态(71.4%);78例慢性淋巴细胞性白血病患者中65例呈miR-9-3甲基化,MSP阳性率为83%。5-氮杂-2'-脱氧胞苷(5-Aza Dc)处理白血病细胞株后I83-E95和WAC3CD5+细胞株miR-9-3呈未甲基化状态。结论慢性淋巴细胞性白血病患者存在miR-9-3表达受抑,可能与其基因甲基化异常有关。而miR-9-3甲基化在激活慢性淋巴细胞性白血病患者NF-κB1信号通路的作用值得进一步研究。     

基于MSP430F149单片机的心电信号数据采集系统的设计与研究

目的设计一种低成本的便携式心电信号数据采集系统，实现长时间对心电信号进行采集与存储。方法对采集的心电信号进行放大、滤波、电平提升和模数转换后存储于Flash存储器，再通过液晶显示器显示实时心电波形。结果本系统可实现对心电信号进行长时间的数据采集和记录。结论本系统对于临床和患者应用都具有一定的实用价值。     

基于STM32的电子血压计的设计与实现

目的:研制一款测量结果准确可靠、测量过程形象直观的电子血压计,用于血压的测量及心脑血管疾病的防治.方法:该电子血压计的设计以STM32F103RBT6为主控芯片,以INA122和OPA333为运算放大器芯片,以KEIL公司的RVMDK3.8为软件设计平台.结果:设计并实现了以STM32微处理器为核心、利用示波法对人体血压进行测量的可显示测压波形的电子血压计.结论:该血压计不仅能准确测量人体血压,还能在测压过程中实时显示血管弹性波动的波形图,使医生和患者直观感受到血压的测量,增强对设备测量准确性的信心.     

Differential antibody recognition of FC27-like Plasmodium falciparum merozoite surface protein MSP2 antigens which lack 12 amino acid repeats

Three alleles of the FC27-type allelic family of the MSP2 gene of the malaria parasite Plasmodium falciparum have been sequenced from parasites from the field (The Gambia and Tanzania). These alleles lack the 12 amino acid repeat units which are usual in this family of MSP2 alleles. We have investigated the recognition by sera from an endemic area (The Gambia) of three recombinant MSP2 proteins that have 5, 1 and no copies of this repeat region. Antibody recognition of these recombinant proteins varied according to the number of repeats present. High titre antibody levels were seen with most sera using the recombinant protein with 5 × 12-mer repeats, whereas only low responses were measured using proteins containing 1 or no 12-mer repeats. Several sera entirely failed to recognise the protein which lacked 12-mer repeats. The data suggest that variation in the number of tandem repeat sequences could allow the parasite to avoid high avidity antibody binding and this may allow escape from immune recognition.     

Monitoring recovery from diaphragm paralysis with ultrasound

BACKGROUND: Diaphragmatic paralysis is an uncommon, yet underdiagnosed cause of dyspnea. Data regarding the time course and potential for recovery has come from a few small case series. The methods that have been traditionally employed to diagnose diaphragmatic weakness or paralysis are either invasive or limited in sensitivity and specificity. A new technique utilizing two-dimensional, B-mode ultrasound (US) measurements of diaphragm muscle thickening during inspiration (Deltatdi%) has been validated in the diagnosis of diaphragm paralysis (DP). The purpose of this study was to assess whether serial US evaluation might be utilized to monitor the potential recovery of diaphragm function. METHODS: Twenty-one consecutive patients with clinically suspected DP were referred to the pulmonary physiology laboratory. Sixteen patients were found to have DP by US (unilateral, 10 patients; bilateral, 6 patients). Subjects were followed up for up to 60 months. On initial and subsequent visits, Deltatdi% was measured by US. Additional measurements included upright and supine vital capacity (VC), maximal inspiratory pressure (Pimax), and maximal expiratory pressure. RESULTS: Eleven of 16 patients functionally recovered from DP. The mean (+/- SD) recovery time was 14.9 +/- 6.1 months. No diaphragm thickening was noted in those patients who did not recover. Positive correlations were found between improvement in Deltatdi% and interval changes in VC, Pimax, and end-expiratory measurements of diaphragm thickness. CONCLUSIONS: US may be used to assess for potential functional recovery from diaphragm weakness or DP. As in previous series, recovery occurs in a substantial number of individuals, but recovery time may be prolonged.     

中国脑型疟患者恶性疟原虫分离株裂殖子表面蛋白MSP1 第16- 17 区基因和MSP2 基因的分子克隆与鉴定

目的: 为设计研制安全有效的人脑型疟疫苗提供理论依据。方法: 根据MAD20 株裂殖子表面蛋白1 (MSP1) 和FC27 株裂殖子表面蛋白2 (MSP2) 基因编码区高度保守碱基设计并合成两对引物, 应用多聚酶链反应(PCR) 技术对5 例脑型疟患者恶性疟原虫云南省勐腊县勐罕分离株CMH/YN 和云南省盈江县农场CYJ/YN 分离株基因组DNA MSP1 第13- 17 区基因和MSP2 基因进行扩增, 并将扩增产物分别经EcoRI 和KpnI, BamHI 和HindIII 双酶切后, 分子定向克隆M13mp18 和M13mp19 载体, 转染大肠杆菌(E. coli) TG1, 从含X-gal 和IPTG 的LB平板上, 将随机筛选得到的单个无色噬菌斑经E. coli JM 103 扩增, 用碱裂解法抽提重组子复制型DNA (RFDNA ) 后, 再分别经EcoRI 和KpnI, BamHI 和HindIII 双酶切鉴定。结果: 证实重组子为编码脑型疟患者恶性疟原虫CMH/YN 和CYJ/YN 分离株MSP1 第16- 17 区基因和MSP2 基因分子克隆M13 载体。结论: 首次报道确证脑型疟患者恶性疟原虫CMH/YN 和CYJ/YN 分离株MSP1 第16- 17 区基因和MSP2 基因分别与MAD20 株MSP1 和FC27 株MSP2 相应基因完全一致。这些发现对研究预防人脑型疟疫苗和建立一种新型脑型疟恶性疟原虫检测方法具有重要意义。