of curaua and piassava ï¬bers. In this ï¬gure, two points should be noted. First, that the average length of curaua, 846 mm, and piassava, 455 mm, are more than 15 times their criti-Figure 1. Automobile components made of natural-ï¬ber-reinforced composites. 25 Figure 2. The dimensional distribution of commercial ï¬bers of (a) curaua and (b)
The treatment of aggressive diseases often benefits very noticeably from combination therapy, especially when involving the immune system. In fact, one often-cited combination therapy is HAART: Highly Active Antiretroviral Therapy used in the treatment of HIV. With six major types of drugs being used in this combination therapy, each slows or disrupts the replication of HIV cells in different ways.
Inhibitors are drugs that work by forming an enzyme-inhibitor complex, which impedes the ability of the enzyme-substrate complex to form. The most successful treatments for HIV have resulted from using inhibitors for the two enzymes reverse transcriptase (step 3 above) and protease (step 7 above).his class of drug acts by inhibiting protease, the enzyme required by HIV to cut its protein into the proper segments to assemble new viral particles. Protease inhibitors, used in combination with two reverse transcriptase inhibitors, have proven to be quite successful.