The MRI scanner measures this signal difference and displays the activity as a colored area (Figure 1). Diffusion Tensor Imaging (DTI) is a technique that detects how water travels along the white matter tracts in the brain (Figure 2). White-matter tracts connect different parts of the brain and must be protected during surgery. A dye (contrast agent) may be injected into your blood stream.
Quick Answer. Diving bell spiders of the species Argyroneta aquatica have the ability to swim, and they use this adaptation to live underwater. Although they live and swim in the water, diving bell spiders still breathe air by creating air pockets underwater that they use as homes. Continue Reading.
Many swimming pool owners in Australia find funnel-web spiders in their pools at some point. These spiders cannot jump or live in the bottom of a pool for very long, but they can be deadly to people. Chlorine in the pool water eventually kills them after several hours of swimming around underwater. Air bubbles stick to their leg hairs, which helps them breathe for awhile.