incidence of adolescent pregnancy.3 Access to contraceptives has become increasingly crucial for adolescents because many are sexually active at earlier ages than in the past. During the mid-to-late 1950s, 8% of adolescent females had had intercourse by age 16. In contrast, by the early-to-mid–1980s, 21% of female teenagers had had sex by age 16. Among all adolescents in the 1990s, 50% had sex ...

The mechanistic understanding of interactions between diet-derived substances and conventional medications in humans is nascent. Most investigations have examined cytochrome P450–mediated interactions. Interactions mediated by other phase I enzymes are understudied. Aldehyde oxidase (AO) is a phase I hydroxylase that is gaining recognition in drug design and development programs. Taken together...

Since the establishment of the first point-to-point radio communication by GuglielmoMarconi in 1895, the complexity of communication systems has grown dramatically in the continuing search for higher system capacity, higher data rates, and bandwidth efficiency. Research in information theory and digital signal processing has been the foundation for the development of systems that are able to ha...

1Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan. ABSTRACT A longitudinal study was done in a leishmaniasis-endemic region in eastern Sudan during the period November 2001–February 2003 to determine the incidence of failure of sodium stibogluconate treatment. We studied 820 confirmed visceral leishmaniasis patients. All were treated with sodium stibogluconate, 20 mg/kg bo...

ity and on the receipt of infertility services from the 1995 National Survey of Family Growth (NSFG) allow us to determine whether and how these phenomena have changed since they were last measured in 1988. Such trend analysis has implications for projecting future health care costs, particularly in an arena of changing insurance coverage and potential health care reform. It may also be relevan...