Researching and Designing for the Orchestration of Learning in the CSCL Classroom

Designing tools for teachers to orchestrate computer supported collaborative learning activities in their classrooms requires that attention be paid to the range of roles and activities a teacher must take throughout the process. Drawing on the Implementing Collaborative Learning in the Classroom framework proposed by Kaendler, Wiedmann, Rummel and Spada (2014), the contributors to this symposium will speak to the way their designs address the various parts of this framework, allowing us to draw conclusions about what has been successful for different parts of this process, and identifying future directions for development and research

Expression of ATF3 and axonal outgrowth are impaired after delayed nerve repair

Background: A delay in surgical nerve repair results in impaired nerve function in humans, but mechanisms behind the weakened nerve regeneration are not known. Activating transcription factor 3 (ATF3) increases the intrinsic growth state of injured neurons early after injury, but the role of long-term changes and their relation to axonal outgrowth after a delayed nerve repair are not well understood. ATF3 expression was examined by immunohistochemistry in motor and sensory neurons and in Schwann cells in rat sciatic nerve and related to axonal outgrowth after transection and delayed nerve repair (repair 0, 30, 90 or 180 days post-injury). Expression of the neuronal cell adhesion molecule (NCAM), which is expressed in non-myelinating Schwann cells, was also examined. Results: The number of neurons and Schwann cells expressing ATF3 declined and the length of axonal outgrowth was impaired if the repair was delayed. The decline was more rapid in motor neurons than in sensory neurons and Schwann cells. Regeneration distances over time correlated to number of ATF3 stained neurons and Schwann cells. Many neurofilament stained axons grew along ATF3 stained Schwann cells. If nerve repair was delayed the majority of Schwann cells in the distal nerve segment stained for NCAM. Conclusion: Delayed nerve repair impairs nerve regeneration and length of axonal outgrowth correlates to ATF3 expression in both neurons and Schwann cells. Mainly non-myelinating Schwann cells (NCAM stained) are present in distal nerve segments after delayed nerve repair. These data provide a neurobiological basis for the poor outcomes associated with delayed nerve repair. Nerve trunks should, if possible, be promptly repaired

Mitochondrial Superoxide Contributes to Blood Flow and Axonal Transport Deficits in the Tg2576 Mouse Model of Alzheimer's Disease

Alzheimer's disease (AD) is a neurodegenerative disease characterized by the progressive decline in cognitive functions and the deposition of aggregated amyloid beta (Abeta) into senile plaques and the protein tau into tangles. In addition, a general state of oxidation has long been known to be a major hallmark of the disease. What is not known however, are the mechanisms by which oxidative stress contributes to the pathology of AD.In the current study, we used a mouse model of AD and genetically boosted its ability to quench free radicals of specific mitochondrial origin. We found that such manipulation conferred to the AD mice protection against vascular as well as neuronal deficits that typically affect them. We also found that the vascular deficits are improved via antioxidant modulation of the endothelial nitric oxide synthase, an enzyme primarily responsible for the production of nitric oxide, while neuronal deficits are improved via modulation of the phosphorylation status of the protein tau, which is a neuronal cytoskeletal stabilizer.These findings directly link free radicals of specific mitochondrial origin to AD-associated vascular and neuronal pathology

Genetic Dissection of the Function of Hindbrain Axonal Commissures

The Robo3 receptor controls midline crossing by axons. Deleting Robo3 in specific commissural neurons with a conditional knockout reveals their contribution to sensory and motor integration, and models human neurological conditions

Criteria for evaluating research: the unique adequacy requirement of methods

The Unique Adequacy requirement of methods (UA) is proposed as a means of evaluating research in construction management. UA addresses the problems stemming from the significance of conscious action in constituting human organisation. These may be summarised as: first, that objectivity is a problematic concept in such studies; second, that the determination of meaning is their primary goal; and third, that formal procedures, whether as methods of research or explanation, have significant limitations. The UA requirement has two forms: the weak form demands that the researcher is competent in the research setting; the strong form, that research reports use only concepts originating within the research setting. The consequences of applying these criteria are explored with reference to recent research reports in construction management, including: a questionnaire survey of cultural difference; an exercise in grounded theorising; a case study of the implementation of a quality management initiative. It is concluded that the UA requirement is a viable tool for evaluating and guiding research. Emphasis is placed on the importance of maintaining a principled distinction between empirical research and theory building

[A survey on surgical training during residency in Sweden - description of the current state]

Practical training for new surgeons differs between institutions, and standards are mostly lacking. The largest problems seem to occur during the first years, when novices begin their specialty training, (specialisttjänstgöring in Swedish). A large number of scientific publications are available, but the they are usually limited to one specific procedure or one surgical specialty, and the results are rarely applied in practice. Scientifically validated and systematic methods for basic training outside the operating room have been called for over the last decade, but the main part of the training still takes place during surgery on patients. In order to evaluate the practising of manual skills among doctors doing their training within surgical specialties, a survey with fourteen questions was carried out. The results show shortcomings that seem easy to remedy in the short term, but long term studies on the subject are required to better understand and systematize surgical training