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.
His name is Brian. Dolomedes briangreenei, affectionately known as Brian, can surf, swim and catch fish. Next thing we know heâll be throwing a prawn on the barbie. A NEW species of spider which can surf, swim and catch fish has been discovered in Queensland. Australian researchers have named it Dolomedes briangreenei, or Brian for short, in honour of physicist and World Science Festival co-founder Brian Greene, who is professor of physics and mathematics at Columbia University.
Almost all spiders are predators, and most eat insects. They catch their prey in several ways. Some build a spider web, and some use a thread of silk that they throw at the insect. Some kinds of spiders hide in holes in the ground, then run out and grab an insect that walks by. Others will make web 'nets' to throw at passing insects. Or they go out and simply attack their prey. Some can jump quite well and hunt by sneaking close to an insect and then jumping on it. There is a myth that Spiders have feet, they do not.