全肝容积灌注CT成像评估兔肝血流灌注及体积对肿瘤坏死率的影响

目的 探讨全肝容积灌注CT成像（VPCT）评估兔肝血流灌注及体积对肿瘤坏死率的影响。方法 采用兔肝VX2移植瘤作为实验组,并设立对照组。实验组及假手术对照组在术后14 d通过全肝VPCT并获得相应的灌注参数,测量并计算实验组肿瘤体积（TV）、肿瘤坏死率（TNR）。检查完后对所有实验组肿瘤标本进行病理学观察。结果 实验组癌组织与对照组肝组织灌注血流量（BF）、灌注血容量（BV）、动脉灌注量（ALP）、门静脉灌注量（PVP）、动脉灌注指数（HPI）比较,差异均有统计学意义（P <0.05）,实验组癌旁组织与对照组肝组织BF、BV、ALP、PVP、HPI比较,差异均无统计学意义（P >0.05）。Pearson相关性分析显示,TNR与ALP、HPI呈负相关（r =-0.410和-0.356,均P <0.05）,TNR与BF、BV、PVP无相关性（r =-0.016、-0.155和0.256,均P >0.05）;TV与BF、BV、PVP、ALP、HPI无相关性（r =0.062、0.292、0.140、0.142和0.014,均P >0.05）;肝VX2移植瘤TNR与TV无相关性（r =-0.098,P >0.05）。HE染色发现肿瘤边缘区为富含血管的环形癌组织,中央为坏死区。结论 兔肝VX2移植瘤TNR与全肝VPCT反映的肿瘤动脉灌注高低有关,与TV无明显关联。     

Isolation and characterization of Mycoplasma sphenisci sp. nov. from the choana of an aquarium-reared jackass penguin (Spheniscus demersus)

Strain UCMJ was isolated from the choana of a jackass penguin (Spheniscus demersus) with recurrent mucocaseous choanal discharge. Isolation of this mycoplasma expands the known range of species hosting mycoplasmas. The name Mycoplasma sphenisci sp. nov. is proposed for this new species, for which strain UCMJ is the type strain.     

慢性肾衰大鼠单个核细胞内游离钙浓度和白介素－1活性的变化

本文探讨了５／６肾切除术后慢性肾衰大鼠残肾纤维化的发生机理，发现术后１２０天，在残肾单个核炎性细胞浸润、残肾显著纤维化和肾功能损害的同时，残肾脂质过氧化物含量显著升高，抗氧化机制功能显著下降，钠钾ＡＴＰ酶活力显著下降，周围血单个核细胞内游离钙浓度显著升高，单个核细胞培养上清白介素－１活性增高。而摄入大量维生素Ｅ的大鼠，上述各指标有不同程度的改善，残肾纤维化显著减轻。提示残肾纤维化可能与单个核白细胞内游离钙浓度升高，进而产生白介素－１增多有关。     

虚拟咬合运动初步仿真模拟的研究与实现

我们试验了利用VR技术进行虚拟咬合仿真制作的全部过程。首先,采用光学三维测量仪对上下颌石膏模型进行数字化,通过预处理获取有效的三角网格曲面模型;其次,对咬合运动模型进行合理的简化,分解为一系列的平移运动和旋转运动;通过动态刷新完成开闭口运动、侧移运动的计算机运动仿真,可视化地观察咬合运动;然后利用模型碰撞检测算法动态地计算咬合接触位,并详细地分析了咬合接触时的咬合点位置分布和咬合剖切面上的咬合点接触关系;最后讨论了目前虚拟咬合仿真存在的问题和今后研究的方向。     

散发性急性戊型肝炎血清抗体动态变化和肝脏超微…

为探讨散发性戊型肝为血清抗体动态变化，应用酶联免疫法（ＥＩＡ）检测了７例急性戊型肝炎抗戊型肝炎病毒（ＨＥＶ）ＩｇＧ和ＩｇＭ抗体、并对１例２进行了肝超微结构病理检测，结果表明，发病１０天至４５天内抗ＨＥＶ－ＩｇＧ和ＩｇＭ滴度最高，发病第４０天仍有肝细胞肿胀，胞浆空化和线粒体固缩等病理变化。患者轿清抗－ＨＥＶＩｇＭ滴度在４５天后逐渐下降，２个月内全中消失，抗－ＨＥＶＩｇＭ滴度在４５天后逐渐下降，２个月     

The frequency of occurrence of autoantibodies against beta1-adrenoceptors and its clinical relevance in patients with hepatitis virus myocarditis

The aim of this study was to examine the frequency of occurrence of autoantibodies against beta1-adrenoceptors in patients with hepatitis virus myocarditis (HVM) and its possible correlation with clinical characteristics. A total of 103 patients with viral myocarditis were divided into a positive group (HVM group, n=29) and a negative group (Non-HVM group, n=74) according to the laboratory findings regarding their type of hepatitis virus. The study parameters included UCG, ECG, biochemical findings and screening of autoantibodies against beta1-adrenoceptor. It was shown that the positive rate of the hepatitis virus was 28.16% (29/103) in patients with viral myocarditis. The severity of myocardial or liver injuries and the frequency of occurrence of autoantibodies against beta1-adrenoceptors in patients with viral myocarditis were more pronounced, before treatment, in the HVM group than in the Non-HVM group. The positive rates of the antibodies against the hepatitis virus and the autoantibodies against beta1-adrenoceptors were highly consistent in patients with HVM (p<0.05). In conclusion, the frequency of occurrence of the autoantibodies against beta1-adrenoceptors may be one important marker of HVM and, thus, possibly involved in the pathogenesis of the HVM.     

人工肱骨头置换与肱骨近端锁定钢板治疗老年复杂肱骨近端骨折的近期临床疗效分析

[摘要] 目的 对比分析人工肱骨头置换术和肱骨近端锁定钢板治疗老年复杂肱骨近端骨折的近期疗效。方法 回顾性分析本院骨科2012年1月~2014年6月采用人工肱骨头置换术和肱骨近端锁定钢板治疗的老年（年龄>65岁）NeerⅢ、Ⅳ部分肱骨近端骨折患者54例，人工肱骨头置换治疗（置换组）30例，肱骨近端锁定钢板内固定治疗（内固定组）24例。比较分析两组手术时间、术中出血量、随访Neer评分及Constant-Murley评分来评定两组临床疗效。结果 两组随访时间相仿，平均随访时间为19.5个月（12~36个月）。内固定组手术时间（101±13）分钟，术中出血量（237.9±32.4）mL，Neer评分（82.5±3.2），Constant-Murley评分（71.7±5.0）；置换组手术时间（98±11）分钟，术中出血量（246.0±39.8）mL，Neer评分（82.9±4.5），Constant-Murley评分（73.5±5.0）。两组手术时间、术中出血量、随访Neer及Constant-Murley评分比较差异均无统计学意义（P＞0.05）。内固定组有1例出现肩关节半脱位，肱骨头置换组有2例出现肩关节半脱位，通过三角巾悬吊后关节脱位均得到纠正。有1例四部分骨折患者，行内固定术后出现内固定松动、肱骨头坏死，改行人工肱骨头置换术。结论 人工肱骨头置换术和肱骨近端锁定钢板治疗老年肱骨近端复杂骨折的近期临床疗效相似，对不可修复的肱骨近端骨折宜行肱骨头置换术。     

检测体内异种II型胶原异体移植引起的细胞毒反应

检测用猪II型胶原免疫新西兰大白兔的异种异体细胞免疫反应。用II型胶原免疫新西兰大白兔60 d,定期抽取血浆检测抗II型胶原抗体;第60 d取兔的外周血淋巴细胞、兔脾细胞、淋巴结分别分离淋巴细胞,进行体外二次II型胶原刺激,检测由此引起的反应性的细胞增殖规律。实验分为二组,第一组加入不同浓度植物血凝素(PHA)作阳性对照,并测定非特异性免疫;第二组加入不同浓度II型胶原,检测特异性免疫。正常兔的淋巴细胞在PHA剌激下发生增殖,但对II型胶原的第一次剌激不发生增殖,而免疫兔对PHA和II型胶原的剌激均能发生显著的增殖。表明异种II型胶原在一定浓度下,可以引起免疫兔的抗II型胶原抗体的升高,并可引起兔脾、外周血淋巴细胞增殖,异种II型胶原能在体内引起细胞免疫反应。     

Identification and comparison of residues critical for cell-adhesion activities of two neutrophil CD66 antigens, CEACAM6 and CEACAM8

CEACAM6 (CD66c) and CEACAM8 (CD66b) are cell-adhesion proteins on neutrophils that belong to the human carcinoembryonic antigen (CEA) family. CEACAM6 reveals homophilic adhesion and heterophilic adhesion to other CEACAM family antigens including CEACAM8, CEACAM1, and CEA, whereas CEACAM8 exhibits only heterophilic adhesion to CEACAM6. Here, we investigated and compared structural requirements for the homophilic adhesion of CEACAM6 and heterophilic adhesion between CEACAM6 and CEACAM8 at the amino acid level by using CHO transfectants expressing their mutant and chimeric proteins. The NH(2)-terminal domain (N-domain) of CEACAM6 expressed on a CHO cell was suggested to bind the N-domain of CEACAM6 or CEACAM8 on the opposing cell. By homologue-scanning mutagenesis, we found that the locations of the sequences critical for the adhesion of CEACAM6 to itself and to CEACAM8 are overlapped and that they are highly similar but not identical to the locations of the residues previously shown to be essential for the binding of CEACAM antigens to Opa proteins of pathogenic NEISSERIAE: Our findings imply that subtle differences in the N-domain sequences determine the specificity of the CEACAM antigens on neutrophils for interaction with the same or different CEACAM antigens and the bacterial proteins.     

肺淋巴管平滑肌瘤病临床病理学观察

目的 探讨肺淋巴管平滑肌瘤病临床、病理特征。方法 对5例肺淋巴管平滑肌瘤病临床资料进行收集分析,HE切片观察,采用免疫组织化学(SP法)检测平滑肌肌动蛋白(SMA)、HMB45、基质金属蛋白酶(MMP)2、孕激素受体(PR)、雌激素受体(ER),并进行文献复习。结果 肺淋巴管平滑肌瘤病是原因不明的肺部疾病,只发生在女性,特别是绝经前妇女。临床表现为呼吸困难,咯血,气胸和乳糜胸等。病理学检查显示不同成熟度平滑肌细胞在细支气管壁、肺泡壁、淋巴管壁和血管壁周围增生,肺实质呈囊性变。增生的平滑肌细胞免疫组织化学5例SMA、HMB45、MMP2均阳性;1例的ER和PR均阳性,1例仅ER阳性,1例仅PR阳性,1例的ER和PR均阴性。结论 育龄期妇女如反复出现自发性气胸、咯血、活动后呼吸困难应考虑肺淋巴管平滑肌瘤病的可能,病理检查可确定肺淋巴管平滑肌瘤病的诊断。