PURPOSE: The suitability of 99mTc-diethylenetriaminepentaacetic acid (DTPA) and 99mTc-sulphur colloid (99mTc-SC) as tracers in gamma Scintigraphy for the evaluation of colon-specific drug delivery systems was assessed in healthy volunteers. METHOD: Sodium chloride core tablets containing either 99mTc-DTPA or 99mTcSC were prepared and compression coated with two different quantities of guar gum....

Many years ago while studying for a degree in mineralogy, I was privileged to visit the Russian Ilmen Mountains, host to two minerals from which several rare-earth elements were discovered — monazite ((Ce, La, Nd, Th)PO4), and another mineral that was first described in 1839 by the German mineralogist Gustav Rose. He found uranium and tantalum in its composition and thus proposed the name urano...