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.
All spiders can be considered deadly to their prey, but from a human perspective, only a small number of species pose any consistent threat to life and limb. Two prime candidates for the most dangerously venomous spiders to people are the âBrazilian wandering spiderâ (Phoneutria spp.) and the âSydney funnelweb spiderâ (Atrax robustus). The âBrazilian wandering spider,â from Central and South America, can be very defensive when threatened. These spiders can get fairly large (4-5 inch leg span) and are sometimes encountered in the United States and Canada in fruit shipments, especially bananas.