Abstract: A dynamic DNA model and DNA model kit that is based on the atomic coordinates of double-stranded DNA, but can be easily untwisted to form a flattened 2-D ladder structure. Once untwisted, the two strands of DNA can be easily “unzipped” to create single-stranded DNA templates that can be used to demonstrate the processes of DNA replication and transcription. The model and kit include two joints that allow the DNA model to be dynamically transformed from its helical arrangement into a straight ladder-like arrangement, with parallel base pairs and anti-parallel “backbones.” One joint is a pin joint, having rotation about one axis, and translation along that axis. The second joint can be a “compound” joint having multiple degrees of freedom at different points; or, it can be simplified to a single rotation axis with a separate translation axis.

Abstract: A portable active fluid-powered ankle foot orthosis. A lower leg mount and a foot bed are pivotally coupled at or proximate to an ankle position. A fluid powered rotary actuator is configured to receive power from a wearable fluid power source and provide controlled force and resistance to aid or inhibit relative rotation of the foot bed and the lower leg mount. An integral controller is provided for receiving data from sensors and controlling the fluid powered rotary actuator to actively assist gait of a user.

Abstract: A dynamic DNA model and DNA model kit that is based on the atomic coordinates of double-stranded DNA, but can be easily untwisted to form a flattened 2-D ladder structure. Once untwisted, the two strands of DNA can be easily “unzipped” to create single-stranded DNA templates that can be used to demonstrate the processes of DNA replication and transcription. The model and kit include two joints that allow the DNA model to be dynamically transformed from its helical arrangement into a straight ladder-like arrangement, with parallel base pairs and anti-parallel “backbones.” One joint is a pin joint, having rotation about one axis, and translation along that axis. The second joint can be a “compound” joint having multiple degrees of freedom at different points; or, it can be simplified to a single rotation axis with a separate translation axis.

Abstract: A portable active fluid-powered ankle foot orthosis. A lower leg mount and a foot bed are pivotally coupled at or proximate to an ankle position. A fluid powered rotary actuator is configured to receive power from a wearable fluid power source and provide controlled force and resistance to aid or inhibit relative rotation of the foot bed and the lower leg mount. An integral controller is provided for receiving data from sensors and controlling the fluid powered rotary actuator to actively assist gait of a user.