Gradient guides nerve growth down spinal cord
The same family of chemical signals that attracts developing sensory nerves up the spinal cord toward the brain serves to repel motor nerves, sending them in the opposite direction, down the cord and away from the brain, report researchers at the University of Chicago in the September 2005 issue of Nature Neuroscience (available online August 14). The finding may help physicians restore function...Master regulatory gene found that guides fate of blood-producing stem cells
Researchers from the University of Pennsylvania School of Medicine found that a protein called NF-Ya activates several genes known to regulate the development of hematopoietic stem cells (HSC), or blood-producing stem cells, in bone marrow. Knowing the details of this pathway may one day lead to new treatments for such blood diseases as leukemia, as well as a better understanding of how HSCs work...Light guides flight of migratory birds
Songbirds use multiple sources of directional cues to guide their seasonal migrations, including the Sun, star patterns, the earth's magnetic field, and sky polarized light patterns. To avoid navigational errors as cue availability changes with time of day and weather conditions, these "compass" systems must be calibrated to a common reference. Experiments over the last 30 years have failed to re...Tapered TEFCOR Movable Core Wire Guides
Description:Used to negotiate tortuous vessels....Double Flexible Tipped Wire Guides
Description:Used for access and catheterization procedures. Double flexible tipped design permits alternative use of both ends of wire guide depending upon procedural needs. Supplied sterile in peel-open packages. Intended for one-time use....Straight Fixed Core Wire Guides
Description:Used for vascular and non-vascular applications. Tapered fixed core construction provides gradual transition to a flexibletip. Supplied sterile in peel-open packages. Intended for one-time use....Double Flexible Tip Wire Guides
Description:Used for access and catheterization procedures. Double flexible tipped design permits alternative use of both ends of wire guide depending upon procedural needs. Supplied sterile in peel-open packages. Intended for one-time use....