This tactile feedback is related to a difference in tis-sue density as one goes from the parenchyma to the vessels or from the parenchyma to the collecting sys-tem, and also to the selectivity of the CUSA to spare tissue of high collagen content.
1 In the least developed countries, the overall illiteracy rate is 49 percent. 2  52 percent of all non-literates live in India and China. 3  Africa as a continent has a literacy rate of less than 60 percent. 4  In Sub-Saharan Africa since 1980, primary school enrollment has declined, going from 58 percent to 50 percent.
Asians now account for about 5% of the nation's population. The African-American population, which grew by about 4.3 million, is now about 40 million, or 12.6% of the population, a slight increase over 12.3% in 2000, officials said. Persons reporting some other race grew by 3.7 million, to 19 million, or 5.5% of the nation, figures show.