双源CT能谱纯化单能量技术在评估喙锁韧带中的价值

目的探讨双源CT能谱纯化单能量技术对喙锁韧带结构显示的可行性及对韧带显示最佳的能量级。 方法回顾性分析40例双能量CT扫描的单侧肩关节患者影像学资料，采用双源CT"单能+"软件分别获得喙锁韧带40 keV、60 keV、70 keV、80 keV、100 keV 5组单能量图像，并与线性融合（M=0.5）图像对比，分析比较不同能级单能量图像间的CT值及信噪比（signal-to-noise ratio，SNR）、最佳单能量图像与线性融合（M=0.5）图像间的SNR以及总体主观图像质量评分。 结果（1）斜方韧带及锥状韧带在40 keV总体主观图像质量评分均高于其他5组（P均<0.05）。2位观察者间主观图像质量评分一致性较好[Kappa（斜方）：0.822~0.978；Kappa（锥状）：0.905~0.971]。（2）5组单能量图像间的斜方韧带CT值及锥状韧带CT值差异均有统计学意义（P均<0.001），且40 keV>60 keV>70 keV>80 keV>100 keV 。（3）40 keV斜方韧带及锥状韧带图像的SNR均高于其他4组，差异有统计学意义（P均<0.05）；70 keV与80 keV斜方韧带及锥状韧带间SNR值比较差异无统计学意义（P>0.05），余各组间的SNR差异均有统计学意义（P<0.05），且40 keV>60 keV>70 keV>100 keV；与线性融合（M=0.5）图像相比，40 keV新单能量图像斜方韧带及锥状韧带SNR值均较高（P<0.05）。 结论双能量CT的单能纯化技术可清晰显示喙锁韧带形态及走行，且在40 keV时对斜方韧带及锥状韧带的显示最佳。     

临床护理教师胜任力现状及与护生的评价比较

目的 调查临床护理教师胜任力水平及影响因素，为提高临床护理教学质量提供参考。方法 采用临床护理教师胜任力问卷、学习动机量表对重庆市11所三级医院的749名临床护理教师及458名实习护生进行调查。结果 临床护理教师胜任力自评均分为4.38±0.49,护生评价均分为4.12±0.65,护生评价总分及6个维度得分显著低于教师自评(均P<0.01);护龄、职务和学习动机是临床护理教师胜任力的影响因素(均P<0.01)。结论 临床护理教师胜任力处于较好水平，但护生评价低于教师自评；护理管理者可通过激发教师的学习动机进一步培养和提升临床护理教师的胜任力。     

Protective mechanism of Wnt4 gene on Parkinson’s disease (PD) transgenic Drosophila

Objective: The main pathological change of Parkinson’s disease (PD) is progressive degeneration and necrosis of dopaminergic neurons in the midbrain, forming a Lewy body in many of the remaining neurons. Studies have found that in transgenic Drosophila, mutations in the PTEN-inducible kinase 1 (PINK1) gene may cause indirect flight muscle defects in Drosophila, and mitochondrial structural dysfunction as well.

Methods: In this study, Wnt4 gene overexpression and knockdown were performed in PINK1 mutant PD transgenic Drosophila, and the protective effect of Wnt4 gene on PD transgenic Drosophila and its possible mechanism were explored. The Wnt4 gene was screened in the previous experiment; And by using the PD transgenic Drosophila model of the MHC-Gal4/UAS system, the PINK1 gene could be specifically activated in the Drosophila muscle tissue.

Results: In PINK1 mutation transgenic fruit flies, the Wnt4 gene to study its implication on PD transgenic fruit flies’ wing normality and flight ability. We found that overexpression of Wnt4 gene significantly reduced abnormality rate of PD transgenic Drosophila and improved its flight ability, and then, increased ATP concentration, enhanced mitochondrial membrane potential and normalized mitochondrial morphology were found. All of these findings suggested Wnt4 gene may have a protective effect on PD transgenic fruit flies. Furthermore, in Wnt4 gene overexpression PD transgenic Drosophila, down-regulation autophagy and apoptosis-related proteins Ref(2)P, Pro-Caspase3, and up-regulation of Beclin1, Atg8a, Bcl2 protein were confirmed by Western Blotting.

Conclusion: The results imply that the restoring of mitochondrial function though Wnt4 gene overexpression in the PINK1 mutant transgenic Drosophila may be related to autophagy and/or apoptosis.     

Clinicopathologic significance of LAIR-1 expression in hepatocellular carcinoma

Aim

Leukocyte-associated immunoglobulin-like receptor-1 (LAIR-1) is an immune inhibitory receptor which is expressed within most types of hematopoietic cells and negatively regulates immune responses. Recently, we found LAIR-1 expression to be present within tumors of nonhematopoietic lineages. However, the roles of LAIR-1 in hepatocellular carcinoma (HCC) have yet to be examined. The purpose of this study was to investigate the expression of LAIR-1 in HCC tissue and assess its clinical significance at this site.