耳炎差异球菌与成人分泌性中耳炎的相关性研究

目的探讨耳炎差异球菌与成人分泌性中耳炎的关系。方法采用多重PCR的方法，检测39例(42耳)成年分泌性中耳炎患者的中耳积液中耳炎差异球菌以及三种常见细菌[肺炎链球菌(S．pneumoniae)、流感嗜血杆菌(H．influenzae)和卡他莫拉杆菌(M．catarrhalis)]的DNA，就细菌DNA存在与成人分泌性中耳炎患者上呼吸道感染(简称上感)史、病程、积液性质和抗生素服用史之间的关系进行分析。结果收集到的42份中耳积液标本中有5份(11．9％)检测到有耳炎差异球菌DNA存在。急性分泌性中耳炎者有1例(3．6％)测得耳炎差异球菌DNA存在，慢性者则有4例(28．6％)，两者差异有显著性意义。浆液性中耳积液有3例(13．0％)测得耳炎差异球菌DNA存在，粘液性中耳积液则有2例(10．5％)为阳性，两者差异有显著性意义。抗生素使用史对耳炎差异球菌DNA检出率的影响无统计学意义。结论细菌参与部分成人分泌性中耳炎的发病，耳炎差异球菌可能是其致病菌之一；且慢性分泌性中耳炎中耳积液的持续存在可能与耳炎差异球菌感染有关。     

负压法肝活检术949例临床分析

目的 :探讨开展负压法肝活检术的可行性和意义。方法 :分析1998年9月至2003年4月我院949例负压法肝活检病例组织学满意度及所出现并发症。结果 :946例肝活检病例穿刺成功 ,病理诊断明确 ,无1例出现严重并发症。结论 :开展负压法肝活检术是安全可行的 ,对临床正确诊断和治疗有着重要意义。     

4年间我院儿科临床大肠埃希菌耐药性变迁分析

目的：监测我院4年间儿科临床分离的大肠埃希菌的耐药情况，了解其耐药性发生和发展的规律，以指导儿科临床合理选用抗大肠埃希菌药物。方法：2001年1月-2004年12月从儿科临床标本分离的84株大肠埃希菌按照分离时间分为2001-2002年组（2001年1月-2002年12月）48株和2003-2004年组（2003年1月-2004年12月）36株，分别比较两组产超广谱B内酰胺酶（ESBLs）和对22种抗菌药物敏感性试验结果。结果：ESBLs检测结果：2001-2002年组产ESBLs株检测率为37．5％（15／40），2003-2004年组产酶株捡出率为46．9％（15／32），经x^2检验，P〉0．05，无显著性差异。药物敏感性实验结果：2003-2004年组比2001-2002年组耐药率明显升高，22种抗生素中除外亚胺培南未发现耐药菌外，其他抗生素耐药率均有不同程度增高，增幅为（16．7％-88．9％），经x^2检验，均有极显著性差异（P〈0．01），其中耐药率上升最快的5种抗生索分别为头孢曲松、头孢唑啉、头孢嚷肟、头孢拉定、头孢呋辛。耐药率上升较慢的5种抗生素分别为阿米卡星、头孢西丁、头孢哌酮／舒巴坦、头孢他定和四环素。结论：儿科临床大肠埃希菌耐药性发展迅速，以对头孢类抗生素耐药性上升最为显著，且呈多重耐药趋势。治疗上不宜选用头孢类抗生索和复方磺胺甲嗯唑，应选用头孢西丁、加酶抑制剂复合抗生素以及亚胺培南。     

Immune responses against SARS-coronavirus nucleocapsid protein induced by DNA vaccine

The nucleocapsid （N） protein of SARS-coronavirus （SARS-CoV） is the key protein for the formation of the helical nucleocapsid during virion assembly. This protein is believed to be more conserved than other proteins of the virus, such as spike and membrane glycoprotein. In this study, the N protein of SARS-CoV was expressed in Escherichia coli DHSalpha and identified with pooled sera from patients in the convalescence phase of SARS. A plasmid pCI-N, encoding the full-length N gene of SARS-CoV, was constructed. Expression of the N protein was observed in COS1 cells following transfection with pCI-N. The immune responses induced by intramuscular immunization with pCI-N were evaluated in a murine model. Serum anti-N immunoglobutins and splenocytes proliferative responses against N protein were observed in immunized BALB/c mice. The major immunoglobulin G subclass recognizing N protein was immunoglobulin G2a, and stimulated splenocytes secreted high levels of gamma interferon and IL-2 in response to N protein. More importantly, the immunized mice produced strong delayed-type hypersensitivity （DTH） and CD^8＋ CTL responses to N protein.     

常见药物23种的毛细管气相色谱分析法

目的　建立临床急诊急救中药物中毒发生率最高的 2 3种药物在血液、胃液或呕吐物样品中的毛细管气相色谱分析法。方法　血液、胃液或呕吐物样品经处理后 ,以溴己新为内标 ,采用SP 5 0 2型气相色谱仪、SE 5 4型毛细管色谱柱、氢焰检测器检测巴比妥、对乙酰氨基酚、异戊巴比妥、苯海拉明、苯巴比妥、氯苯那敏 (扑尔敏 )、普萘洛尔 (心得安 )、阿米替林、多赛平 (多虑平 )、安坦、异丙嗪、苯妥英钠、罗拉、安定、氯丙嗪、甲氧氯普胺 (胃复安 )、三氟拉嗪、硝西泮 (硝基安定 )、思诺思、氯氮平、艾司唑仑、氟哌啶醇、阿普唑仑等 2 3种药物。结果　该方法在选定条件下 ,能将样品中 2 3种药物成分分离 ,线性范围为 0 .0 2～ 30 .0 0mg L ,最低检出浓度为 0 .0 2～ 0 .5 0mg L ,平均回收率为 86 .8%～10 2 .8% ,相对标准偏差为 2 .8%～ 6 .2 %。结论　该方法操作简便 ,灵敏度高 ,可快速、准确地为临床提供诊断依据。     

The clinical significance of thyroid hormone-responsive in thyroid carcinoma and its potential regulatory pathway

The study aimed to evaluate the clinical significance of thyroid hormone-responsive (THRSP) and explore its relevant pathways in thyroid carcinoma (THCA).The gene expression data of THRSP were obtained and the prognostic significance of THRSP in THCA was analyzed through various bioinformatics databases. Then, the factors influencing THRSP mRNA expression were explored, and the function of THRSP in predicting the lymph node metastasis (LNM) stage was determined. We further performed the enrichment analysis and constructed a protein–protein interaction (PPI) network to examine potential regulatory pathways associated with THRSP.THRSP gene expression was significantly increased in THCA compared with the normal tissues. High THRSP mRNA expression had a favorable overall survival (OS) in THCA patients (P < .05). Additionally, the mRNA expression of THRSP was related to stage, histological subtype, and methylation among THCA patients (all P < .05). Besides, THRSP served as a potent predictor in discriminating the LNM stage of thyroid cancer patients. According to Kyoto Encyclopedia of Genes and Genomes (KEGG) and gene set enrichment analysis (GSEA) on THRSP-associated genes, THRSP was positively related to metabolic pathways.The upregulation of THRSP predicted a good OS in THCA patients. Furthermore, THRSP might inhibit THCA progression through positive regulation of metabolism-associated pathways.     

Intraoperative choroidal detachment during small-gauge vitrectomy: analysis of causes,anatomic, and visual outcomes

IntroductionTo investigate the incidence and causes of intraoperative choroidal detachment (CD) during small-gauge vitrectomy, as well as the anatomic and visual outcomes.MethodsWe retrospectively reviewed the medical records of 1026 consecutive patients who underwent small-gauge vitrectomy from June 2017 to December 2018 at Zhongshan Ophthalmic Centre, Guangzhou, China. Data on the presence, location, and extent of intraoperative CD and its relationship to the infusion cannula were collected. Patient demographic characteristics and postoperative anatomic and visual outcomes were also assessed.ResultsA total of six cases were found to have intraoperative CD, including two with serous CD, three with limited haemorrhagic CD, and one with CD caused by inadvertent perfusion of gas during air/fluid exchange. Retraction of the infusion cannula and acute ocular hypotony were found to be the main causes of intraoperative CD in five out of the six cases. The best-corrected visual acuity of all cases significantly improved after the surgery.ConclusionThe incidence of intraoperative CD during small-gauge vitrectomy is low; the predominant causes are retraction of the infusion cannula and acute ocular hypotony. Immediate awareness and timely closure of the incision may contribute to a better surgical prognosis.Subject terms: Uveal diseases, Diseases     

Multi-Step Forming Simulation and Quality Control of Aluminum Alloy Automobile Rear Upper Control Arm

Aluminum alloy is widely used in automobile parts because of its light weight and good process performance. In view of the complex structure of aluminum alloy automobile rear upper control arms, multiple forming processes and the difficulty in quality control, in this paper, we propose a rolling-forging composite process to produce a rear upper control arm. Based on the reasonable volume distribution of the blank by cross-wedge rolling, multi-step forging was carried out. Finite element simulation of thermomechanically coupled multi-step forming was carried out using DEFORM software. Based on a comparison of the traditional process and the proposed rolling-forging composite forming process, we concluded that the rolling-forging composite process can greatly reduce the material cost and the forming force, resulting in superior product performance. The coarse-grain structure of products at different process temperatures was analyzed by a crystal-phase experiment. The results show that the process temperature of the multi-step process, as well as the heat treatment temperature and time have an important influence on the coarse-grain structure of the product. The optimal preheating temperatures for preforging and final forging dies were determined to be 335 °C and 350 °C, respectively; a preheating temperature of 530 °C and a solution time of 45 min resulted in the least coarse-grain surface structure. The research results provide a theoretical basis for improving the multi-step forming quality of automobile rear upper control arms.