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Evaluation of Processed Nerve Allograft in Peripheral Nerve Surgery : A Systematic Review and Critical Appraisal

Background: Peripheral nerve injuries cause substantial problems when not treated properly. A specific problem is reconstruction of nerve defects, which can be treated in different ways. This study aimed to systematically review whether processed nerve allograft (PNA) is justified in reconstruction of a nerve defect in patients after posttraumatic or iatrogenic peripheral nerve injury and to compa

Pulcaffeate, a Trimeric Caffeic Acid Derivative from Bourreria pulchra

The trimeric caffeic acid derivative pulcaffeate (1) was isolated from the organic crude extract of the roots of Bourreria pulchra (Boraginaceae). The biosynthesis of 1 appears to involve an intramolecular Diels-Alder reaction between a cyclohexa-1,3-diene intermediate, generated by the oxidation of the aromatic ring of a cinnamic acid unit, and the conjugated double bond of a caffeic acid unit. T

From failure to success: a framework for successful deployment of Industry 4.0 principles in the aerospace industry

Purpose The paper proposes a framework for the successful deployment of Industry 4.0 (I4.0) principles in the aerospace industry, based on identified success factors. The paper challenges the perception of I4.0 being aligned with de-skilling and personnel reduction and instead promotes a route to successful deployment centred on upskilling and retaining personnel for future role requirements. Desi

Distortion and attenuation free gain-assisted Superluminal Propagtion in a Rare-Earth Doped Crystal

A light pulse that travels through a narrow spectral window, i.e. a frequency range of low absorption, within a strongly absorbing frequency range will be delayed due to strong dispersion. If however, the absorbing structure is inverted, such that it is amplifying instead, one will see that a pulse travelling through this window will have its pulse peak come out of the material before it is sent i

A Narrative Turn : Human Agency in Rock Carvings at Nämforsen, Northern Sweden

The idea to create pictorial narratives seems to have occurred long after humans learned to produce iconic images, that is, depictions based on visual similarity to external objects. In Scandinavia, e.g., in Gärde, Sweden or Stykket and Bøla, Norway, early Mesolithic images (e.g., rock carvings from before c. 5000 BCE) often feature animals that are solitary or without suggestion of causal or narr