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Identification of avian flapping motion from non-volant winged dinosaurs based on modal effective mass analysis
by Yaser Saffar Talori, Jing-Shan Zhao, Yun-Fei Liu, Wen-Xiu Lu, Zhi-Heng Li, Jingmai Kathleen O'Connor The origin of avian flight is one of the most controversial debates in Paleontology. This paper investigates the wing performance ofCaudipteryx, the most basal non-volant dinosaur with pennaceous feathered forelimbs by using modal effective mass theory. From a mechanical standpoint, the forced vibrations excited by hindlimb locomotion stimulate the movement of wings, creating a flapping-like motion in response. This shows that the origin of the avian flight stroke should lie in a completely natural process of active loc...
Source: PLoS Computational Biology - May 1, 2019 Category: Biology Authors: Yaser Saffar Talori Source Type: research

Using Dental Pulp Stem Cells for Stroke Therapy
Conclusion and Future Perspectives Stem cell-based therapy is a promising alternative for stroke treatment. While stem cells from different sources, including induced PSC, ESC, MSC, and NSC, have been investigated, using NSC and enhancing the natural mechanisms is most appropriate for brain repair. In preclinical models of stroke, stem cell transplantation has led to positive outcomes through a variety of cellular and molecular mechanisms, many being mediated by the array of beneficial factors produced by the cells. Recent advances in cellular reprogramming have provided alternative sources of NSC to be investigated, allo...
Source: Frontiers in Neurology - April 28, 2019 Category: Neurology Source Type: research