Pressure Ulcer Deï¬nition Localized injury to the skin and /orunderlying tissue usually over a bonyprominence, as a result of pressure, orpressure in combination with shearand/or friction.
1 The 2.4GHz MacBook with 2GB of memory is available for about $1,000.  Apple's ultraportable laptop, the MacBook Air, is aimed at business travelers. The 1.6 or 1.86GHz processor is slower than a MacBook but what it loses in power it gains in portability.
While replacing a laptop outright can quickly ring up a tab of several hundred dollars, individual components are often much more affordable. A battery replacement may run from $20 to $50. It can cost as little as $50 to upgrade a laptop's RAM. A 500GB 2.5-inch internal hard drive costs about $60, but a 480GB solid-state drive (SSD) upgrade kit may sell for $400 or more.