Three dimensional (3D) printing is considered as an advanced manufacturing technology because of its additive nature. Electron beam melting (EBM) is a widely used 3D printing processes for the manufacturing of metal components. However, the products printed via this process generally contain micro porosities which affect mechanical properties, especially the fatigue property. In this paper, two types of EBM printed samples of the Ti-6Al-4V alloy, one with a round cross section and the other with a triangle cross section, were employed to investigate the existence of porosities using computed tomography (CT). Statistical analyses were conducted on the number, volume, shape, and distribution of pores. The results show that small pores (less than 0.000 2 mm3) account for 80% of all pores in each type of samples. Additionally, to some extent, the shape of sample has influence on the number of micro porosities in EBM made Ti-6Al-4V. The sphericity of the pores is relatively low and is inversely proportional to pore volume. It is found that re-melting on the free surface effectively reduce pore density near the surface. This study may help produce a medical implant with better fatigue resistance.
目的 探究艾滋病(AIDS)合并马尔尼菲青霉病(PSM)的感染率，以及常规实验室检查结果和5种抗真菌药物对马尔尼菲青霉菌(PM)的体外抗菌活性。 方法 2006年1月-2009年11月间确诊AIDS患者326例，从其血液、骨髓培养出65株PM，检测该65例患者的血常规、肝功能和肾功能，并对20株酵母相PM进行体外药敏进行分析。 结果 AIDS合并PSM的感染率为19.94%；外周血常规：WBClt;4.0×109/L者48例，HBlt;100 g/L者51例，PLTlt;100×109/L者46例。肝功能检查：ALTgt;40 U/L者49，ASTgt;40 U/L者51例，GGTgt;60 U/L者44例，ALPgt;150 U/L者36例，ALBlt;35 g/L者53例，A/G倒置者50例。肾功能检查：BUNgt;7.2 mmol/L者9例，Crgt;150 μmol/L者4例。20株酵母相PM对5-氟胞嘧啶(5FC)、两性霉素B(AMB)、氟康唑(FCA)、伊曲康唑(ITR)、伏立康唑(VRC)的敏感率分别为75%、90%、80%、90%、90%。 结论 AIDS合并PSM感染率较高；患者感染后外周血WBC、HB、PLT通常低于正常人，肝功能多表现异常，肾功能的改变较少；对PM的治疗以AMB、ITR、VRC为首选。
Objective The immunogenicity of tissue engineered skins is still vague, though it has been appl ied cl inically for several years. To observe the evidence of immunologic rejection of tissue engineered skins transplanted to severe combined immunodeficiency (SCID) mice, which are implanted human splenic lymphocytes to construct human immunesystem. Methods Tissue engineered skins and acellular dermic matrix were constructed in vitro. Twenty SCID mice, aging4-6 weeks and weighing 16-17 g, were randomly divided into four groups equally (n=5). The tissue engineered skins, human foreskins from circumcision and acellular dermic matrix were transplanted to groups A, B, and C, respectively; group D was used as a control. After 2 weeks of transplanting, 3 × 107 human splenic lymphocytes were injected into every SCID mouse intraperitoneally. After 4 weeks, the morphology, histology, immunohistochemistry and human IgG immunofluorescence were used to observe immunologic rejection. Results Group A showed that transplanted tissue engineered skins had the bilayer structure of dermis and epidermis, which was similar to the normal human skin structure. Group B showed that the transplanted human foreskins still retained normal structure of human skin. Group C showed that acellular dermic matrix were located in situ and had no sign of degradation. After injecting human splenic lymphocytes into the SCID mice, no inflammatory cells infil itration were observed basically in groups A, C, and D; the inflammatory cells infil itration of group B were significantly higher than that of other 3 groups (P lt; 0.05). The results of anti human keratin 14 monoclonal antibody (mAb) staining and anti human type IV collagen mAb staining were positive in group A; no positive cells for CD3, CD4, and CD8 were observed in groups A, C, and D; and many positive cells for CD3, CD4, and CD8 were observed in group B. The results of IgG immunofluorescence staining was negative in group A, C, and D, and positive in the great vessel wells of group B. Conclusion The immunogenicity of tissue engineered skins is very weak, and tissue engineered skins would not be rejected by host immune system after transplantation.
ObjectiveTo systematically review the accuracy of T-cell receptor excision circles (TRECs) in screening newborns for severe combined immunodeficiency (SCID). MethodsThe PubMed, EMbase, Cochrane Library, Web of Science, CBM, WanFang Data and CNKI databases were electronically searched to collect the diagnostic accuracy studies related to the objects from inception to October 26, 2022. Two reviewers independently screened the literature, extracted data, and assessed the risk of bias of the included studies using the QUADAS-2 scale. Meta-analysis was performed using Stata 15.0 and Meta-Disc 1.4 software. ResultsA total of 18 studies involving 6 243 718 neonates were included. The results of meta-analysis showed that the pooled sensitivity (SEN), specificity (SPE), positive likelihood ratio (PLR), negative likelihood ratio (NLR), and diagnosis odds ratio (DOR) were 0.97 (95%CI 0.92 to 0.99), 1.00 (95%CI 1.00 to 1.00), 1447.05 (95%CI 528.49 to 3962.11), 0.13 (95%CI 0.08 to 0.22) and 11698.21 (95%CI 2853.44 to 47958.98), respectively. The area under the summary receiver operating characteristic curve (SROC) was 0.97. ConclusionThe application of TRECs in screening neonatal SCID has high accuracy, which is helpful for early diagnosis of SCID. Due to the limited quality and quantity of the included studies, more high-quality studies are needed to verify the above conclusion.
Human immunodeficiency virus (HIV) infection mainly attacks the human immune system, causing a variety of opportunistic infections and tumors, among which neoplastic diseases are serious and life-threatening. In recent years, with the popularization of highly effective anti-retroviral virus, the disease spectrum of HIV infected people has changed greatly, the incidence of non-acquired immune deficiency syndrome (AIDS) related tumors has increased significantly, and the diagnosis rate of esophageal cancer patients with HIV/AIDS has also increased. However, there is no consensus on how to standardize the diagnosis and treatment of esophageal cancer patients with HIV/AIDS. This article reviews the epidemiological characteristics, diagnosis and treatment of esophageal cancer patients with HIV/AIDS.
【摘要】 目的 探讨综合性医院内获得性免疫缺陷综合征（acquired immune deficiency syndrome，AIDS）患者的肺部表现及其特征。 方法 回顾性分析2006年2月－2009年12月收治的58例AIDS患者肺部病变的临床资料。 结果 58例患者中男47例，女11例，男女比例为4.27∶1；年龄6~78岁，平均43岁，其中lt;50岁者36例，占62.1%，gt;50岁22例，占37.9%。肺部表现是AIDS患者入住综合性医院的常见临床表现，居各种临床表现的首位（占55.2%）。主要有弥漫性肺部疾病和肺结核，分别是21例（36.2%）和23例（39.7%），收治的主要科室是呼吸内科38例（65.5%）和传染科12例（20.7%）；常见的临床症状有发热、咳嗽、活动后气促或呼吸困难；其肺部影像学表现多样，有毛玻璃样变、弥漫性结节影、斑片影、肺内块影或肺内空洞、纤维条索影或伴胸水；其常见伴随症状有口腔溃疡真菌、腹泻或其他消化道症状，及其皮疹、贫血、神经系统症状等；同时也有部分患者合并乙型肝炎病毒/丙型肝炎病毒/梅毒等混合感染。 结论 AIDS的肺部病变是综合性医院住院AIDS患者的主要表现，提高呼吸科医师对AIDS患者肺部表现的认识将有利于AIDS的临床防治。【Abstract】 Objective To investigate the clinical characteristics of acquired immune deficiency syndrome (AIDS) with pulmonary diseases in comprehensive hospitals. Methods The clinical data of 58 cases of AIDS with pulmonary diseases admitted in our hospital from 2006 to 2009 were analysed retrospectively. Results Among the patients, there were 47 males and 11 females, and the proportion of the number of males to females was 4.27∶1. Their age ranged from 6 to 78 years old, averaging at 43. Thirty-six patients (62.07%) were under 50 years old; and there were 22 patients (37.93%) aged 50 or above. The pulmonary expression was common in AIDS patients admitted into comprehensive hospitals, occupying the first place in various clinical manifestatiosn (55.24%). Pulmonary expressions of AIDS were mainly diffuse pulmonary diseases and pulmonary tuberculosis, which had 21 (36.21%) and 23 (39.66%) cases respectively. Chief treating departments were Department of Respiratory Medicine (65.52%) and Department of Infective Diseases (20.69%). Its common symptoms included fever, cough, shortness of breath after activities or dyspnea; Its pulmonary image had various manifestations including ground-glass opacity (GGO), diffuse nodal shadow, spot and thin piece shadow, pulmonary chunk shadow or cavity, fibre twigs shadow or/and hydrothorax; Its common combined symptoms included oral cavity ulcer fungus infection, diarrhoea or other digestive tract symptoms, and erythra, anemia, and nervus system symptoms, etc. There were still some other cases of combined viral hepatitis type B, type C, or syphilis. Conclusion Pulmonary diseases of AIDS are the main expressions of patients with AIDS in comprehensive hospitals. It will be beneficial to clinical prophylaxis and treatment of AIDS to heighten the knowledge of respiratory physicians on pulmonary expressions of patients with AIDS.
Patients with acute human immunodeficiency virus (HIV) infection are the critical source of infection due to high viral load and strong transmission ability. The vast majority of patients in the acute infection stage have no or only mild clinical symptoms, and their screening and diagnosis often rely on laboratory tests. However, there are still some difficulties in early screening and detection for HIV infection due to the detection window period. In recent years, laboratory testing for acute HIV infection has made great progress. This article reviews the progress in laboratory testing of acute HIV infection, in order to provide a reference for follow-up related research.