.... occur in advancing lesions before the accumulation of inflammatory cells. These changes are mediated by activated CD4+ T lymphocytes and can be detected before visible pathology to the skin occurs. Activated T lymphocytes exhibiting an increase in HLA-DR and IL-2R can be seen in close proximity to Langerhans cells in the dermis before lesion formation. Since Langerhans cells are antigen presenting cells, activation of the T cells may occur by the recognition of an as-yet unidentified antigen in the context of MHC class II. These activated T lymphocytes then migrate to the epidermis and activate epidermal keratinocytes. .....

.... organisms to engineering design or engineering new approaches or products to improve human health and productivity. On the one hand, the biomedical engineer may use his/her knowledge of physiological systems to reverse engineer nature, creating, for example, artificial tissues and neural networks. “On the other hand, a biomedical engineer may use knowledge of engineering to create new equipment or environments for maximizing human performance, accelerating wound healing, providing non-invasive diagnostic tools, product design, or numerous other applications.” (Drexel University) One of the main biomedical engineering ar .....

.... The next Mars lander is scheduled for January 3, 1999 liftoff. Mars Polar will touch down on Mars in December 1999, carrying two softball-size penetrators, the Deep Space 2 mission, that will crash land on Mars some 60 miles north of the landing site. All is going well with ’s Saturn-bound Cassini mission and the Deep Space 1 mission. Cassini will reach Saturn in June 2004 and Deep Space 1 will rendezvous with asteroid 1992KD in July 1999. The Galileo spacecraft at Jupiter went into a safe mode just six hours before its scheduled flyby of Europa on November 21-22, meaning it failed to collect any images or data; probably .....

.... is the Golgi apparatus which is used for sorting, storing, and secretion for the cell. Next are lysosomes, which hydrolyze macromolecules. Then there are centrioles that play a major role in cell division. And lastly there are vacuoles which have a variety of storage functions. The plant cell is similar in most ways. The only really big differences between the plant cell and the animal cell are as follows. The first is the outer membrane. The plant cell has a cell wall that highly acts as support to the cell, where the animal cell has a more flexible, softer outer membrane. Also in the plant cell are chloroplasts, which ar .....

.... creatures have such catholic tastes or more ingenious methods of satisfying them as have s (Gilbert, 1991, p. 69). The list of what exactly the consumes is quite extensive. Eighty percent of their diet is rodents. However, they will eat pretty much whatever they can find. Watermelons are also a food source for this omnivorous and carnivorous species. As one of my sources puts it, the takes what it can get (Jones, 1999). Sheep, road kill, insects, domestic cats, apples and your garbage are all viable meals for the . In essence, the is a scavenger, an omnivore, and a carnivorous animal that will sometimes hunt in packs of ten .....

.... to rock particles. Primary or compressional waves (P waves) send particles oscillating back and forth in the same direction as the waves are traveling, whereas secondary or transverse shear waves (S waves) impart vibrations perpendicular to their direction of travel. P waves always travel at higher velocities than S waves, so whenever an earthquake occurs, P waves are the first to arrive and to be recorded at geophysical research stations worldwide.(Associated Press 1993) Earthquake waves were observed in this and other ways for centuries, but more scientific theories as to the causes of quakes were not proposed until modern .....

.... we encode an enormous amount of information unintentionally, many other types of information we remember only with much effort, rehearsal, and attention. We can forget things because of encoding failure. Sometimes we fail to encode information, so it never entered the memory system, short-term or long-term memory. A vast amount of what we sense, we never notice or process without encoding effortful process. We also may forget things as a result of retrieval failure, sometimes information gets in our brains and even if we know it is there, we simply cannot retrieve the information. This is when you get the feeling that the inf .....

.... instance monitoring abuse can be found in the in the situation of airline agents. The agents discovered that by keeping customers on hold while finishing their work they could gain an extra 5-minute break (De Tienne 462). In the future these evasions of work will be stopped and for this reason "employee's who are accustomed to evading the monitoring system may no longer be able to tolerate it" (De Tienne 463). These types of employees may find they can no longer survive the added pressure of not being able to evade the system (DeTienne 463). While monitoring can add pressure to some employees it can also be a relief to oth .....

.... dependence, tolerance, addiction, and can cause psychosis. The use of Meth is going up. In 1995, 3.9% of high school seniors had used it. That's an increase of 2.7% since 1990. 8 out of 10 people who try Meth will become addicted. Famous people who have done Meth include- Chris Farley, John Belushi, and Mick Jagger. The cost of doing Meth is very high too. A user can spend up to $100 a day. And sometimes, spending $400-$500 to support an addiction is not unusual. The penalties are very severe for those caught with Meth. Possession of any quantity of Meth can carry up to 7 years in prison. Distributing Meth carries a pe .....

.... a tidal marsh. In 1948, New York City planner Robert Moses developed a highly praised project to deposit municipal garbage in the swamp until the level of the land was above sea level. A study of the area predicted the marsh would be filled by the year 1968. He then planned to develop the area, building houses and attracting light industry over the landfill. The Fresh Kills Landfill was originally meant to be a conservation project that would benefit the environment. The mayor of New York City issued a report titled "The Fresh Kills Landfill Project" in 1951 which stated, in part, that the project "cannot fail to affect cons .....