22 research outputs found
Incubation environment impacts the social cognition of adult lizards
Recent work exploring the relationship between early environmental conditions and cognition has shown that incubation environment can influence both brain anatomy and performance in simple operant tasks in young lizards. It is currently unknown how it impacts other, potentially more sophisticated, cognitive processes. Social-cognitive abilities, such as gaze following and social learning, are thought to be highly adaptive as they provide a short-cut to acquiring new information. Here, we investigated whether egg incubation temperature influenced two aspects of social cognition, gaze following and social learning in adult reptiles (Pogona vitticeps). Incubation temperature did not influence the gaze following ability of the bearded dragons; however, lizards incubated at colder temperatures were quicker at learning a social task and faster at completing that task. These results are the first to show that egg incubation temperature influences the social cognitive abilities of an oviparous reptile species and that it does so differentially depending on the task. Further, the results show that the effect of incubation environment was not ephemeral but lasted long into adulthood. It could thus have potential long-term effects on fitness
Análise comparativa das alterações nos fluxos de tensão do joelho nas próteses totais e unicompartimentais cimentadas: estudo experimental em dez cadáveres humanos
Effect of the oxygen content in solution on the static and cyclic deformation of titanium foams
O papel do tamanho dos poros na biocompatibilidade de duas próteses de polipropileno usadas na retopexia pré-sacra estudo experimental em cães
Direct visualization and quantification of bone growth into porous titanium implants using micro computed tomography
Geometric analysis and clinical outcome of two cemented stems for primary total hip replacement with and without modular necks
Metal release and corrosion effects of modular neck total hip arthroplasty
Modular neck implants are an attractive treatment tool in total hip replacement. Concerns remain about the mechanical stability and metal ion release caused by the modular connection. Five different implant designs were investigated in an experimental set-up. In vivo conditions were simulated and the long-term titanium release was measured. Finally, the modular connections were inspected for corrosion processes and signs of fretting. No mechanical failure or excessive corrosion could be identified for the implants tested. The titanium releases measured were extremely low compared to in vivo and in vitro studies and were not in a critical range