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.
Dock spiders can swim. A dock spider can actually swim under water and stay submerged for several minutes. It uses air bubbles trapped in the fine hairs on its body under its belly to provide oxygen while it is under water â a bit like a dock spider scuba dive. Dock spiders walk on water.
Salticidae (jumping spiders) in the order Araneae (spiders) Description: This jumping spider, like many other jumping spiders, is fuzzy, walks with jerky movements, jumps astonishingly long distances, and doesn't build webs. To identify this species, note the fuzzy, usually black body with spots on the abdomen.