胰岛素样生长因子结合蛋白3mRNA在肾癌中的表达

为探讨胰岛素样生长因子结合蛋白3（IGFBP-3）mRNA在肾癌（RCC）中的表达,采用半定量RT-PCR方法进行检测,检测56例RCC组织标本及56例癌旁组织标本中IGFBP-3的表达。结果显示RCC与癌旁组织之间IGFBP-3表达差异有显著性（P〈0.05）,IGFBP-3在透明细胞癌的强阳性表达,高于其他病理类型（P均〈0.05）,并与病理分级相关。因此,IGFBP-3在RCC组织中的表达具有显著性,其在肾透明细胞癌中的强阳性表达具有特异性。     

创伤后成长：5·12地震创伤的新视角

创伤后成长是人们与主要的生活危机斗争后所体验到的一种积极的心理改变。对此概念的认识存在着结果与策略、建设功能与幻想功能、认知成分与行为成分的争论。对它的解释模型包括经历困难的力量、心理准备和存在的再评价。而它与心理健康的关系仍存在争议。建议此领域的研究应从概念澄清入手,开展过程研究和纵向研究,建立行为指标,关注其临床应用,进行本土化研究,并为5·12震后心理重建工作提供新的思路     

孤独症生命早期脑过度生长现象及启示

孤独症神经结构研究中近来一个重要的发现是,孤独症生命早期存在脑过度生长的现象。进一步的探查表明,孤独症个体脑的过度生长主要由脑白质的过度生长造成,并且脑的过度生长又主要体现于那些较晚成熟的高级脑区。这一研究成果有助于孤独症儿童的早期发现和诊断,也提示孤独症并不是由单一的局部神经缺陷造成,其存在着广泛分布式的神经发展障碍     

LGM模型中缺失数据处理方法的比较:ML方法与Diggle-Kenward选择模型

追踪研究中缺失数据十分常见。本文通过Monte Carlo模拟研究,考察基于不同前提假设的Diggle-Kenward选择模型和ML方法对增长参数估计精度的差异,并考虑样本量、缺失比例、目标变量分布形态以及不同缺失机制的影响。结果表明:(1)缺失机制对基于MAR的ML方法有较大的影响,在MNAR缺失机制下,基于MAR的ML方法对LGM模型中截距均值和斜率均值的估计不具有稳健性。(2)DiggleKenward选择模型更容易受到目标变量分布偏态程度的影响,样本量与偏态程度存在交互作用,样本量较大时,偏态程度的影响会减弱。而ML方法仅在MNAR机制下轻微受到偏态程度的影响。     

Impact of coherent and incoherent twin boundaries on the microhardness of annealed nanocrystalline Ni–W alloys

The microstructural evolution of nanocrystalline Ni–W alloys with annealing temperature and more specifically grain boundary (GB) character is investigated through several techniques and correlated with the hardening behaviour. It is shown that two distinct regions can be identified in relation to the annealing temperature and the microstructural evolution. At temperatures below 550 °C (Regime I), a small increase in grain size is observed and is accompanied by a significant hardening and an increase in the fraction of Σ3 incoherent twin boundaries. At temperatures above 550 °C (Regime II), the thermal stability is overcome and important grain growth occurs with a decrease in both the volumic fraction of GBs and the microhardness. It is suggested that the microhardness evolution during heat treatment is influenced by two opposing processes: an increase in the fraction of incoherent twin boundaries (hardening effect) and grain growth (softening effect). Both aspects are directly associated with the mean free path of mobile dislocations.     

Self-reported posttraumatic growth predicts greater subsequent posttraumatic stress amidst war and terrorism

Background and objective: This study tested three alternative explanations for research indicating a positive, but heterogeneous relationship between self-reported posttraumatic growth (PTG) and posttraumatic stress symptoms (PSS): (a) the third-variable hypothesis that the relationship between PTG and PSS is a spurious one driven by positive relationships with resource loss, (b) the growth over time hypothesis that the relationship between PTG and PSS is initially a positive one, but becomes negative over time, and (c) the moderator hypothesis that resource loss moderates the relationship between PTG and PSS such that PTG is associated with lower levels of PSS as loss increases. Design and method: A nationally representative sample (N?=?1622) of Israelis was assessed at three time points during a period of ongoing violence. PTG, resource loss, and the interaction between PTG and loss were examined as lagged predictors of PSS to test the proposed hypotheses. Results: Results were inconsistent with all three hypotheses, showing that PTG positively predicted subsequent PSS when accounting for main and interactive effects of loss. Conclusions: Our results suggest that self-reported PTG is a meaningful but counterintuitive predictor of poorer mental health following trauma.     

Randomized controlled trial of mindfulness-based stress reduction (MBSR) on posttraumatic growth of Chinese breast cancer survivors

Breast cancer (BC) patients in China suffered from a variety of psychology stress such as perceived stress and anxiety, posttraumatic growth (PTG) as a positive factor could promote their psychology health and quality of life. This study aimed to investigate the efficacy of mindfulness-based stress reduction (MBSR) on promoting PTG, decreasing perceived stress and anxiety of Chinese BC patients. A randomized controlled trial of 60 BC patients (Stages I–III) was conducted. They were randomly divided to the 8-week MBSR group or usual care (UC) group. PTG inventory, Perceived Stress Scale of Chinese version (CPSS) and State Trait Anxiety Inventory (STAI) evaluated the PTG level, perceived stress and anxiety at three times(before intervention-T1, after intervention-T2 and follow up at 3 months-T3). A repeated-measures analysis of variance model was used to compare each outcome measure of two groups at the three times. There was one patient discontinued the intervention and one lose to follow up in MBSR group, finally 58 BC patients completed the research. There was no difference between two groups before the intervention. The results showed significant improvements in MBSR group comparing with the UC group that PTG level was much higher after the 8-week intervention and the follow up (F = 34.73, p < .00). At the same time, CPSS (F = 14.41, p < .00) and STAI (F = 15.24, p < .00) scores were significant decreased at T2 and T3. The results showed that MBSR promoted the level of PTG and decreased perceived stress and anxiety state of Chinese BC patients, and the results persisted at three months after intervention. The research preliminary proved that MBSR was suitable to Chinese BC patients. MBSR should be recommending to BC survivors in China.     

Individual and Collective Posttraumatic Growth in Victims of Natural Disasters: A Multidimensional Perspective

This study set out to incorporate the collective dimensions of posttraumatic growth and examined the construct and predictive validity of The Individual and Collective Posttraumatic Growth Scale (ICPTGS). Participants were 332 volunteers who had experienced the earthquake on February 27, 2010, in Chile. Analysis allowed us to confirm a multidimensional structure composed of four dimensions: individual, spiritual, communal growth, and societal growth. Additionally, we identified association among ICPTGS, perceived emotional impact, and social well-being. This study emphasizes that positive changes resulting from the exposure to collective disasters can be perceived also at the collective or community level.