CT影像与X线影像对肺结核疗程判定的对比分析

目的探讨CT影像在肺结核疗程中的诊断价值。方法选择继发型肺结核和胸膜炎者127例,在标准疗程结束时做影像检查,根据CT结果延长疗程3个月至1年不等,全疗程结束时作胸片及CT对比。结果X线显示可以结束疗程者,经CT检查病变仍有活动性者65例。结论CT检查对肺结核痊愈期判定明显优于X光片。     

不同载体介导的绿色荧光蛋白基因在大鼠颌下淋巴结的表达

目的探讨阳离子聚合物Sofast基因转染试剂(Sofast)和阳离子脂质体Lipofectamine2000(Lipo)经不同途径向大鼠转入绿色荧光蛋白基因(PEGFP-N2),观察其在颌下淋巴结(SMLN)的表达。方法45只Wistar大鼠随机分成9组:Lipo/DNA前房注射组(A)、结膜下注射组(B)、颞下方穹隆部注射组(C)和下睑皮下注射组(D);Sofast/DNA前房注射组(E)、结膜下注射组(F)、颞下方穹隆部注射组(G)、下睑皮下注射组(H)和阴性对照组(I)。分别于注射后48小时取同侧SMLN,通过荧光显微镜观查和流式细胞仪(FCM)检测各组的SMLN中PEG-FP-N2的表达。结果A-D、E-H各实验组的SMLN中均可观察到绿色荧光。相同载体不同部位注射DNA后颞下方穹隆部注射组和下睑皮下注射组可以获得相对较高的转染效率。相同部位不同载体注射DNA后Sofast/DNA注射组的转染效率高于Lipo/DNA注射组。结论Sofast在SMLN的基因转染中优于Lipo。DNA/Sofast可以通过颞下方穹隆部注射和下睑皮下注射在SMLN获得相对较高的表达。     

快速动态增强磁共振成像在眼眶占位性病变中的诊断价值

目的探讨快速动态增强磁共振成像(MRI)在眼眶占位性病变诊断中的价值。设计回顾性病例系列。研究对象21例眼眶占位性病例。方法患者眼眶占位性病变均行MRI快速动态增强扫描并得到病理证实。原始数据经GE Functool软件后处理,对时间信号强度曲线(TIC)、峰值时间、1分钟强化率及最大强化率等进行分析。主要指标时间信号强度曲线,1分钟强化率,最大强化率。结果眼眶良、恶性占位性病变的时间信号强度曲线有各自特点,16例良性病变中12例表现为持续升高型,5例恶性肿瘤中3例淋巴瘤均为平台型;恶性肿瘤的1分钟强化率(150.47±42.18)大于良性病变(1 01.37±43.02)(P=0.021);海绵状血管瘤有特殊的充填式强化模式。结论MRI快速动态增强检查有助于眼眶良、恶性占位性病变的诊断和鉴别诊断。(眼科,2007,16:305-308)     

Fertilization of supernumerary oocytes following gamete intrafallopian transfer (GIFT): Correlation with outcome of GIFT treatment

In the course of 280 consecutive gamete intrafallopian transfer (GIFT) attempts, supernumerary oocytes in excess of those transferred were inseminated in vitro. Pregnancy resulted in 31.1% of patients following the GIFT treatment. The overall in vitro fertilization (IVF) rate of supernumerary oocytes was significantly higher in those who became pregnant (41.2%) than in patients who did not (34.9%). However, the failure to fertilize any supernumerary oocytes was not significantly different between those becoming pregnant (27.6%) and those in whom the treatment failed (37.3%). Failure to fertilize any supernumerary oocytes in vitro was of a higher rate if suboptimal sperm preparation was used or if only one oocyte was left over for in vitro insemination following the GIFT treatment. We concluded that the in vitro fertilization rate was higher in the pregnant group, but the total failure to fertilize or the fertilization of any supernumerary oocytes does not predict the outcome of GIFT. Embryos resulting following fertilization of excess oocytes may be cryopreserved for subsequent use.     

不同发育天数囊胚冻融移植后妊娠结局分析

目的比较不同发育天数冻融囊胚移植后的妊娠结局。方法回顾性分析1 176例行冻融囊胚移植患者的临床资料,其中植入前遗传学诊断(preimplantation genetic diagnosis,PGD)周期135例,比较第5日单囊胚移植(single embryo transfer,SET)组、双囊胚移植(double embryo transfer,DET)组与第6日SET组和DET组的妊娠结局。结果同是优质囊胚级别的条件下,第5日DET组的生化妊娠率(56.91%)、临床妊娠率(53.25%)以及多胎妊娠率(1.20%)显著高于其他组(P0.05);第5日DET组与SET组的胚胎着床率无统计学差异(P0.05),但均显著高于第6日DET组和SET组(P0.05);同级别以及PGD周期中第5日和第6日SET组相比较,第5日组的生化妊娠率、胚胎着床率均显著高于第6日组(P0.05)。结论在同是优质囊胚的条件下,第5日SET、DET及经PGD诊断的SET妊娠结局均优于第6日。     

复方转移因子激发CD4^＋T淋巴细胞的实验研究

目的用化疗药物建立免疫细胞抑制的动物模型，以免疫细胞为观察指标评价复方转移因子的提高免疫细胞的能力。方法用环磷酰胺（CTX）灌胃（100mg／kg），隔天一次，连续五次，造成免疫功能抑制的动物模型，通过不同实验组用药前后免疫细胞的变化，以评价复方转移因子高、中、低（相当人用量的2、5、10倍）剂量组是否能提高实验动物的免疫细胞。结果复方转移因子能显著提高实验小鼠白细胞数量，复方转移因子低、中、高剂量组与模型组比较，P〈0．01，差别有极显著性；复方转移因子能显著提高实验小鼠淋巴细胞百分比及CD4^＋T淋巴细胞的绝对数，P〈0．01，差别有极显著性。结论复方转移因子能提高实验小鼠WBC及CD4^＋T淋巴细胞的数量，并与剂量有关。     

Theoretical and Experimental Models to Evaluate the Possibility of Corrosion Resistant Concrete for Coastal Offshore Structures

This study built theoretical and practical models to evaluate the corrosion resistance of concrete for coastal offshore structures in Vietnam. A mathematical model was developed in the form of a system of nonlinear partial differential equations characterizing the diffusion “free calcium hydroxide” in a solid of a concrete structure. The model describes the process of non-stationary mass conductivity observed in the “concrete structure—marine environment” system under non-uniform arbitrary initial conditions, as well as combined boundary conditions of the second and third kind, taking into account the nonlinear nature of the coefficients of mass conductivity k and mass transfer β. It was shown that the solution of the boundary value problem of non-stationary mass conductivity allows us to conclude about the duration of the service life of a concrete structure, which will be determined by the processes occurring at the interface: in concrete—mass conductivity, depending on the structural and mechanical characteristics of hydraulic structures, and in the liquid phase—mass transfer, determined by the conditions of interaction at the interface of the indicated phases.     

Mass/Heat Transfer Analogy Method in the Research on Convective Fluid Flow through a System of Long Square Mini-Channels

The paper presents the results of experimental investigations of mass transfer processes with the use of the limiting current technique. This experimental work analyzed the not fully developed entrance laminar region. The tested case refers to the convective fluid flow through a system of nine long, square mini-channels that are 2 mm wide and 100 mm long. The method used in the measurements allows one to determine mass transfer coefficients during the electrolyte flow by utilizing electrochemical processes. The received mass transfer coefficients were applied to the analogous heat transfer case. The Chilton–Colburn analogy between mass and heat transfer was applied. The obtained results, in the form of the dependence of Nusselt number within the function of Reynolds and Prandtl numbers, can be a useful formula in the design and analysis of heat transfer processes in mini heat exchangers.     

IL‐27 improves adoptive CD8+ T cells’ antitumor activity via enhancing cell survival and memory T cell differentiation

IL‐27 is an anti‐inflammatory cytokine that triggers enhanced antitumor immunity, particularly cytotoxic T lymphocyte responses. In the present study, we sought to develop IL‐27 into a therapeutic adjutant for adoptive T cell therapy using our well‐established models. We have found that IL‐27 directly improved the survival status and cytotoxicity of adoptive OT‐1 CD8⁺ T cells in vitro and in vivo. Meanwhile, IL‐27 treatment programs memory T cell differentiation in CD8⁺ T cells, characterized by upregulation of genes associated with T cell memory differentiation (T‐bet, Eomes, Blimp1, and Ly6C). Additionally, we engineered the adoptive OT‐1 CD8⁺ T cells to deliver IL‐27. In mice, the established tumors treated with OT‐1 CD8⁺ T‐IL‐27 were completely rejected, which demonstrated that IL‐27 delivered via tumor antigen–specific T cells enhances adoptive T cells’ cancer immunity. To our knowledge, this is the first application of CD8⁺ T cells as a vehicle to deliver IL‐27 to treat tumors. Thus, this study demonstrates IL‐27 is a feasible approach for enhancing CD8⁺ T cells’ antitumor immunity and can be used as a therapeutic adjutant for T cell adoptive transfer to treat cancer.     

相位对比电影MR成像评估婴幼儿脑血流特点

目的 采用相位对比电影MR成像(PC cine MRI)观察婴幼儿颈内动脉(ICA)血流动力学特点,评估脑血流量(CBF).方法 对37例婴幼儿行MR检查,以多个编码流速度PC cine MR序列测量ICA峰值流速(Vp)及血流量,计算单位体积CBF.采用Pea rson线性相关分析观察周龄与ICA Vp、ICA血流量...