Collective plasma phenomena induced in the ionospheric F-region by intense high-frequency radiation are examined on several time and length scales. The short wavelengh, high-frequency turbulence associated with the observed high-frequency enhanced electron density fluctuations at the electron plasma frequency is shown to result from parametric excitation of plasma and acoustic waves by the high...

The most interesting and challenging applications of rapid prototyping technologies are in the field of medicine. RP medical models have found application for planning treatment for complex surgery procedures, training, surgical simulation, diagnosis, design and manufacturing of implants as well as medical tools. This paper explores and presents the procedure for making medical models using RP,...

The Gen-Probe Aptima human immunodeficiency virus type 1 (HIV-1) RNA assay was adapted for the diagnosis of HIV infection in infants by using dried blood spots. The assay was 99% sensitive (128/129) and 100% specific (162/162). This may prove useful in resource-limited settings, since it precludes the need for a phlebotomist and maintenance of a cold chain.

CONTENTS INTRODUCTION ..... . . ...... ..... ......... .............. . . . ...... .......................... ......................... . . . ... ... 147 ANTIGEN SHARING BETWEEN MICROBES AND THEIR ANIMAL HOSTS .... ... ..... .. 148 Mycoplasma ............................................................. ....... ... ............... ........ ... ......... .. .. 148 Bacteria .........................

INTRODUCTION..........................................155 METHODS FOR DETECTING MULTIPLE MOLECULAR FORMS OF AN ENZYME.............155 HEXOKINASE...........................................157 MULTIPLE FORMS OF ENZYMES APPEARING As ARTIFACTS OF PURIFICATION............158 LACTIC DEHYDROGENASE....................................158 ALKALINE PHOSPHATASE....................................161 ESTERA...