Enhanced Photo-Fenton Activity of SnO2/α-Fe2O3 Composites Prepared by a Two-Step Solvothermal Method

The x-SnO₂/α-Fe₂O₃ (x = 0.04, 0.07, and 0.1) heterogeneous composites were successfully prepared via a two-step solvothermal method. These composites were systematically characterized by the X-ray diffraction technique, field emission scanning electron microscopy, an energy dispersive spectrometer, X-ray photoelectron spectroscopy and a UV–visible spectrometer. It was found that SnO₂ nanoparticles were uniformly decorated on the surface of α-Fe₂O₃ particles in these heterogeneous composites. A comparative study of methylene blue (MB) photodegradation by α-Fe₂O₃ and x-SnO₂/α-Fe₂O₃ composites was carried out. All x-SnO₂/α-Fe₂O₃ composites showed higher MB photodegradation efficiency than α-Fe₂O₃. When x = 0.07, the MB photodegradation efficiency can reach 97% in 60 min. Meanwhile, the first-order kinetic studies demonstrated that the optimal rate constant of 0.07-SnO₂/α-Fe₂O₃ composite was 0.0537 min⁻¹, while that of pure α-Fe₂O₃ was only 0.0191 min⁻¹. The catalytic mechanism of MB photodegradation by SnO₂/α-Fe₂O₃ was examined. The SnO₂ can act as a sink and help the effective transfer of photo-generated electrons for decomposing hydrogen peroxide (H₂O₂) into active radicals. This work can provide a new insight into the catalytic mechanism of the photo-Fenton process.     

Non-Mass Breast Lesions on Ultrasound: Feature Exploration and Multimode Ultrasonic Diagnosis

The aim of this study was to analyze the features of non-mass breast lesions (NMLs) on B-mode ultrasound (US), color Doppler US, strain elastography (SE) and contrast-enhanced ultrasound (CEUS) and to develop a multimode ultrasonic method for NML differentiation. Seventy-one NMLs were included in this retrospective study. Binary logistic regression was used to identify the independent risk factors. Pathology results were used as the standard criterion. Microcalcification on US, high stiffness on SE and hyper-enhanced intensity on CEUS were identified as features correlated with malignancy. A multimode method to evaluate NMLs based on the logistic regression was developed. The sensitivity and specificity for US, US?+?Doppler, US?+?SE, US?+?CEUS and the multimode method were 100% and 29%, 92.5% and 41.9%, 97.5% and 58.1%, 90.0% and 58.1% and 95.0% and 77.4%, respectively. The accuracy of these methods was 69.0%, 70.4%, 80.2%, 76.1% and 87.3%, respectively. The multimode ultrasonic method is simple and exhibited high diagnostic performance, which might be helpful for predicting the potential malignancy of NMLs.     

Early-Stage Geopolymerization Process of Metakaolin-Based Geopolymer

The geopolymerization of aluminosilicate materials in alkaline environments is a complex physicochemical process that greatly influences the microstructure and engineering performances. This work aims to reveal the geopolymerization process of metakaolin-based geopolymer (MKG) in the first 5 d. Physicochemical characteristics of different evolution stages are disposed of in chronological order. The evolutions of electrical resistivity, dehydration process, volume deformation, and ionic concentration are comprehensively analyzed. Results show that chemical dissolution produces large dismantled fragments rather than small free monomers. The formation of a solid matrix follows the “spatial filling rule”, which means that gels grow by locking swelling fragments to form a framework, then densely filling residual space. Based on chemical models, early geopolymerization of MKG can be divided into six stages from the physicochemical perspective as dismantling, locking fixation, free filling, limited filling, second dissolution, and local mending. Those findings expand the understanding of the phase evolution of the early geopolymerization process; thus, the microstructure of MKG can be better manipulated, and its engineering performances can be improved.     

Addison’s disease with pituitary hyperplasia: a case report and review of the literature

This case study describes a 33-year-old man with Addison’s disease who presented with increased plasma adrenocorticotropic hormone (ACTH), normal plasma cortisol, and absent diurnal rhythms. Magnetic resonance imaging (MRI) indicated pituitary hyperplasia. Conventional hydrocortisone replacement therapy may not inhibit high ACTH levels in the morning; however, replacing hydrocortisone with dexamethasone achieved good therapeutic results.     

重型再生障碍性贫血患者外周血自然杀伤细胞亚群百分比及功能变化

目的 分析重型再生障碍性贫血(SAA)患者免疫抑制治疗(IST)前、后外周血自然杀伤(NK)细胞亚群占淋巴细胞百分比、功能变化及其与造血功能相关性,探讨NK细胞在SAA发病机制中的作用.方法 用流式细胞术检测2010年4月至2010年12月天津医科大学总医院收治的12例初治(初治组)、30例IST后恢复(恢复组)的SAA患者的外周血NK细胞(CD3-CD56+/CD16+)及其亚群[CD3-CD56brightCD16-(CD56bright)、CD3-CD56dimCD16+(CD56dim)、CD3-CD56-CD16+]占淋巴细胞百分比、活化性受体(NKG2D和NKp46)、穿孔素、颗粒酶β表达,并与13名健康对照(对照组)比较;分析上述变化与外周血中性粒细胞比例(ANC%)、淋巴细胞比例、网织红细胞计数及骨髓造血功能(增生程度、粒系百分比、红系百分比、巨核细胞数量、淋系百分比)的相关性.结果 (1)初治组NK细胞、CD56bright细胞百分比(10.30%±6.08%、0.11%)均显著低于恢复组(16.47%±8.29%、0.68%,P＜0.05)和对照组(19.45%±6.88%、0.53%,均P＜0.05);初治组CD56dim细胞百分比(9.62%±6.04%)明显低于对照组(18.21%±7.16%,P＜0.05);恢复组CD3-CD56-CD16+细胞百分比(0.79%)显著高于初治组及对照组(0.37%、0.41%,均P＜0.05).(2)初治组与恢复组NK细胞NKp46、穿孔素表达[初治组(88.23%、64.97%±21.61%),恢复组(82.97%、66.14%±20.73%)]显著高于对照组(40.99%、42.11%±27.25%,均P＜0.05).(3)NK、CD56bright及CD3-CD56-CD16+细胞的百分比与SAA患者ANC%呈正相关(r分别为0.423、0.609、0.468,均P＜0.05),与骨髓粒系百分比呈正相关(r分别为0.357、0.517、0.434,均P＜0.05);NK、CD56bright、CD56dim和CD3-CD56-CD16+细胞的百分比与SAA患者骨髓增生程度呈正相关(r分别为0.455、0.412、0.404、0.451,均P＜0.05),与骨髓淋系百分比呈负相关(r分别为-0.522、-0.435、-0.411、-0.547,均P＜0.05);NK细胞NKG2D、NKp46、穿孔素、颗粒酶β表达与各造血指标无相关性(均P＞0.05).结论 SAA患者外周血NK细胞、CD56bright、CD56dim亚群占淋巴细胞百分比降低及穿孔素途径增强可能引起免疫耐受被破坏、T细胞功能亢进而导致造血功能衰竭.

Abstract：

Objective To analyze the percentage and functional changes of natural killer(NK)cell subsets in peripheral blood of severe aplastic anemia(SAA)patients before and after immunosuppressive therapy(IST)so as to evaluate the relationships between these changes and hematopoietic functions and explore the role of NK cells in the pathogenesis of SAA.Methods By flow cytometry,the percentages of NK cells(CD3-CD56+/CD16+)and its subsets[CD3-CD56brightCD16-(CD56bright),CD3-CD56dimCD16+(CD56dim),CD3-CD56-CD16+]in peripheral blood lymphocytes were detected in 12 untreated patients,30 recovered patients and 13 normal controls respectively from April 2010 to December 2010 in our hospital.NK cells activating receptors(NKG2D and NKp46),pofforin and granzyme-β of patients and normal controls were also detected.The correlation between these changes and hematopoietic functions,including the percentages of neutrophil granulocyte(ANC%),lymphocyte and reticulocyte absolute value in peripheral blood,and hyperplasia degree,percentage of granulocytes,erythrocytes,lymphocytes and megakaryocytes absolute value in bone marrow were evaluated.Results (1)The percentages of NK cells (10.30% ± 6.08%)and CD56 bright cells(0.11%)in untreated patients were significantly lower than those of recovered patients(16.47% ± 8.29%,0.68%,both P ＜0.05)or normal controls(19.45% ±6.88%,0.53%,both P ＜0.05).The percentage of CD56dim cells in untreated patients was significantly lower than that of normal controls(9.62% ±6.04% vs 18.21% ±7.16%,P ＜0.05).The percentage of CD3 CD56 CD16 + cells was significantly higher in recovered patients than that of untreated patients or normal controls(0.79% vs 0.37%,0.41%,both P＜0.05).(2)The expression of NKp46 and pefforin of NK cells in untreated(88.23%,64.97% ± 21.61%)and recovered patients(82.97%,66.14% ±20.73%)were significantly higher than those of healthy controls(40.99%,42.11% ±27.25%,all P ＜0.05).(3)The percentage of NK CD56bright and CD3-CD56-CD16+ cells of patients was positively correlated with ANC%(r=0.423,0.609,0.468 respectively,all P＜0.05)and the percentage of granulocytes in bone marrow(r=0.357,0.517,0.434 respectively,all P＜0.05).The percentages of NK,CD56bight,CD56dim and CD3-CD56-CD16+ cells were positively correlated with the hyperplasic degree of bone marrow(r=0.455,0.412,0.404,0.451 respectively,all P＜0.05),but they were negatively correlated with the percentage of lymphocytes in bone marrow(r =-0.522,-0.435,-0.411,-0.547 respectively,all P ＜0.05).The expression of NKG2D,NKp46,pefforin and granzyme-β of NK cells had no correlation with hematopoiesis(all P＞0.05).Conclusion The lowered percentage of NK CD56bright,CD56dim cells and a higher expression of pefforin may cause the over-function of T lymphocytes and thus lead to hematopoietic failure in SAA.     

锁定加压钢板内固定术治疗桡骨远端粉碎性骨折临床观察

目的：探讨掌侧入路切开复位锁定加压钢板内固定术治疗桡骨远端粉碎性骨折的临床疗效。方法：采用切开复位锁定加压钢板内固定术治疗18例桡骨远端粉碎性骨折。结果：18例患者（均为单侧）全部获得6～15个月随访,平均8个月,骨折均完全愈合,平均愈合时间3个月。桡骨长度无短缩,随访未发现钢板、螺钉松动、钢板断裂及骨折移位现象。按GartandWerley评分标准进行腕关节功能评估,18例患者功能评定为优,无并发症发生。结论：早期行切开复位锁定加压钢板内固定术是治疗桡骨远端粉碎性骨折较理想的方法。     

Castleman病的临床探讨

目的：旨在提高对Castleman病的诊断和治疗水平,方法：搜集了6个病例,进行分析。结果：本病女性多于男性,中年发病居多,纵膈和腹腔淋巴结是好发部位,临床上局灶型比多中心型多见,病理类型中血管滤泡型和浆细胞型之比为4：2,本病预后较好,结论：该病与人疱疹病毒8（HHV－8）有关,该病患者此病毒抗体阳性率可达90％以上,诊断依靠组织学确定,通过病理本病可和淋巴瘤区分之间的不同,治疗方面,手术切除是首选,应用干扰素类抗病毒药物,有助于控制本病的发展。     

肝细胞癌患者血清蛋白质组成分的双向凝胶电泳-飞行时间质谱分析

目的　分析肝细胞癌患者与正常人血清双向凝胶电泳的差异蛋白质 ,寻找肝癌早期血清学诊断的可能指标。方法　固相 pH梯度双向凝胶电泳分离肝细胞癌患者及正常人血清总蛋白。银染显色 ,PDQuest 2DE软件分析 ,对差异蛋白质点用基质辅助激光解吸电离飞行时间质谱 (MALDI TOF MS)测定其胶内酶解后的肽质指纹图谱 ,用PepIdent软件查询SWISS PROT数据库。 结果　获得了重复性较好的双向电泳银染图谱。图像分析检测 3块胶平均匹配的点数占平均蛋白点数的匹配率是 70 2 %。等电聚焦方向的平均偏差为 (1 0 2± 0 2 2 )mm ,十二烷基硫酸钠 聚丙烯酰胺凝胶电泳 (SDS PAGE)方向的平均偏差为 (0 97± 0 14 )mm。将 2 3个差异点进行胶内原位酶解 质谱指纹图分析 ,获得 15张肽质指纹图 ,查询数据库进行了初步鉴定。结论　固相 pH梯度双向凝胶电泳分离人血清总蛋白获得重复性较好的结果 ,但仍需进一步探索如何去除高丰度已知蛋白及脂类等物质的方法 ,以便得到分辨率更高的双向电泳银染图谱。MALDI TOF MS肽质指纹图分析鉴定的结果为人肝细胞癌血清学诊断指标的筛选提供了依据     

不同类别军医大学生学习认识和期望的比较

目的调查不同类别军医大学生对于学习的认识和期望。方法应用自制问卷,比较不同类别军医大学生对于学习的认识和期望情况。结果无军籍学员对待学习的认识和期望较高;其次是联合培养学员、战士学员(χ2=33.933,97.079;P均0.001)。结论针对不同类别军医大学生对待学习的认识和期望情况,采取有针对性的教育措施保持和提高其水平。