真核双基因表达载体p1RES-Rb94-E1A的构建与鉴定

以pE1A质粒为模板,扩增E1A基因,然后将E1AcDNA片段插入前期已经构建好的真核表达载体pIRES-Rb94的MCSB的SalI与NotI之间,获得真核双基因表达质粒p1RES-Rb94-E1A,转染肺腺癌A549细胞后,采用RT—PCR和Westernblot方法检测Rb94和E1A在A549细胞中的表达,为研...     

高级技工诊断生产活动的认知策略的汇编栅格法研究

本研究采用汇编栅格法探讨了高级技工(专家)诊断人机系统生产活动的认知策略,结果表明:第一,在高级技工的认知结构中,存在着对多因素交互作用下复杂情况进行诊断的认知地图,它以特定方式组合着常见的问题类型和原因特征,是制约技工复杂技能教学成效的关键要素。第二,汇编栅格法是对人机系统中专家的认知结构进行功能模拟的一种有效方法,它不仅在揭示未知的高级技工认知结构时,以其直观的投射方式提供专家启发式策略的新信息,而且在培训和评估复杂技能方面具有可观的应用前景。     

The Meaning of Emotion in the White Afrikaans Language Group: A Componential Emotion Theory Approach

This study determined the meaning of emotion in a sample of white Afrikaans-speaking adults (n=120; males =32, females=88, age range =18–48+ years). Data were collected using the Meaning Grid (Scherer, 2005). The analysis examined the factor loadings of emotion words via a factor analysis and factor scores of 24 emotion terms were determined. Results indicated the following dimensions to characterize the meaning of emotion in the sample: activation-pleasantness, arousal/unpredictability and a power-control. The conclusion can be drawn that four dimensions are needed to satisfactory represent the meaning of emotion words in the white Afrikaans language group.     

Towards a Global Human Embryonic Stem Cell Bank

An increasingly unbridgeable gap exists between the supply and demand of transplantable organs. Human embryonic stem cell technology could solve the organ shortage problem by restoring diseased or damaged tissue across a range of common conditions. However, such technology faces several largely ignored immunological challenges in delivering cell lines to large populations. We address some of these challenges and argue in favor of encouraging contribution or intentional creation of embryos from which widely immunocompatible stem cell lines could be derived. Further, we argue that current immunological constraints in tissue transplantation demand the creation of a global stem cell bank, which may hold particular promise for minority populations and other sub-groups currently marginalized from organ procurement and allocation systems. Finally, we conclude by offering a number of practical and ethically oriented recommendations for constructing a human embryonic stem cell bank that we hope will help solve the ongoing organ shortage problem.     

Spatial limits on referred touch to an alien limb may reflect boundaries of visuo-tactile peripersonal space surrounding the hand

In this study, the spatial limits of referred touch to a rubber hand were investigated. Participants rated the strength of the perceived illusion when the rubber hand was placed in one of six different spatial positions (at a distance of 17.5-67.5cm horizontal from the participant's own hand). The results revealed a significant nonlinear relationship in the strength of the illusion, with the strongest ratings given when the two hands were closest; decaying significantly after a distance of 30cm. The time taken to elicit the illusion followed a similar trend. These results may reflect the response properties of bimodal visuo-tactile cells encoding peripersonal space around the hand.     

胰岛细胞再生研究的临床应用前景

胰岛细胞再生是治愈1型糖尿病和胰岛β细胞功能丧失的2型糖尿病的根本途径。体外再生和体内再生两种策略都是通过将干细胞或其他类型体细胞分化或转化为胰岛细胞后发挥胰岛素分泌功能,从而治疗糖尿病。基础研究显示,两者存在着各自的优势和面临的问题。胰岛细胞再生治疗的临床应用前景尚需要进一步加以考证。     

Memory influences on hippocampal and striatal neural codes: effects of a shift between task rules

Interactions with neocortical memory systems may facilitate flexible information processing by hippocampus. We sought direct evidence for such memory influences by recording hippocampal neural responses to a change in cognitive strategy. Well-trained rats switched (within a single recording session) between the use of place and response strategies to solve a plus maze task. Maze and extramaze environments were constant throughout testing. Place fields demonstrated (in-field) firing rate and location-based reorganization [Leutgeb, S., Leutgeb, J. K., Barnes, C. A., Moser, E. I., McNaughton, B. L., & Moser, M. B. (2005). Independent codes for spatial and episodic memory in hippocampal neuronal ensembles. Science, 309, 619-623] after a task switch, suggesting that hippocampus encoded each phase of testing as a different context, or episode. The task switch also resulted in qualitative and quantitative changes to discharge that were correlated with an animal's velocity or acceleration of movement. Thus, the effects of a strategy switch extended beyond the spatial domain, and the movement correlates were not passive reflections of the current behavioral state. To determine whether hippocampal neural responses were unique, striatal place and movement-correlated neurons were simultaneously recorded with hippocampal neurons. Striatal place and movement cells exhibited a response profile that was similar, but not identical, to that observed for hippocampus after a strategy switch. Thus, retrieval of a different memory led both neural systems to represent a different context. However, hippocampus may play a special (though not exclusive) role in flexible spatial processing since correlated firing amongst cell pairs was highest when rats successfully switched between two spatial tasks. Correlated firing by striatal cell pairs increased following any strategy switch, supporting the view that striatum codes change in reinforcement contingencies.     

非雄激素依赖型前列腺癌与肿瘤干细胞——浅析辩证思维之于临床医学的方法论作用

在前列腺癌的治疗中,由于癌细胞的不断“升级”使得治疗屡屡受挫。近来提出的肿瘤干细胞理论认为:肿瘤是一种干细胞疾病,只有消灭了“种子”,才能克服癌症。从自然辩证法的角度,结合肿瘤干细胞理论对前列腺癌的诊疗加以分析,解释非雄激素依赖型前列腺癌的发病机制,以一种新的思维指导临床治疗。     

Making Cells Worthwhile: Calculations of Value in a European Consortium for Induced Pluripotent Stem Cell Banking

The StemBANCC consortium was a large European consortium bringing together scientists from academic institutions and the pharmaceutical industry. The aim of the consortium was to produce 1500 induced pluripotent stem cell (iPSC) lines from participants with a variety of common, complex diseases. These cell lines were intended to help develop iPSC as tools for screening small molecule drug candidates and modelling human diseases in vitro. The scale of investment in this and other biobanks presents iPSC as a valuable commodity. However, StemBANCC was also mandated to make its making cells and data available to European researchers on a not-for-profit basis. To understand how making this quantity of stem cells and data available is configured as a valuable and worthwhile investment for the consortium partners, research materials (project documents, scientific literature and interviews with scientists working on StemBANCC) were analysed using theoretical tools from Valuation Studies. Combining STS and economic sociology, valuation studies analyse how the worth of things, ideas and phenomena result from context-specific practices of assessment and evaluation; worth incorporates moral, financial, scientific, economic. social and cultural registers of value. In this sense, practitioners evaluate the worth of the StemBANCC cells and data at a variety of sites, from participant recruitment to online databases. This provides an alternative to biovalue and similar conceptual models for theorising the generation of value in the Life Sciences.     

Synchrnoic consciousness from a neurological point of view: the philosophical foundations for neuroethics

Daniel Kolak’s theory of synchronic consciousness according to which the entire range of dissociative phenomena, from pathologies such as MPD and schizophrenia to normal dream states, are best explained in terms of consciousness becoming simultaneously identified as many selves, has revolutionary therapeutic implications for neurology and psychiatry. All these selves, according to Kolak—even the purely imaginary ones that exist as such only in our dreams—are not just conscious but also self-conscious, with beliefs, intentions, living lives informed by memories (confabulatory, in the case of the fictional ones) and personal histories. Kolak’s derivation of psychiatrically relevant aspects of his theory—a neurological rendition of a Kantian transcendental argument—can be given a straightforward neurological, and therefore open to scientific scrutiny, interpretation that would then more easily lend itself to the clinical setting in which these perplexing phenomena, along with their purveyors, must live and cope. This will be the main focus of this paper.