In previous studies, we have shown that a relatively large amount of low density lipoproteins is released into the perfusate during isolated pig liver perfusion. The present studies were done to determine the source of these lipoproteins. Breakdown of the very low density lipoproteins to low density lipoproteins by the perfusion apparatus or by hepatic catabolism was excluded by adding 125I ver...

naturally occurring radionuclides have different amount of activity concentration for 226 ra, 232 th and 40 k in building materials. in this study, natural radioactivity has been measured for bricks used in tehran. for this work, 9 samples of three types of bricks, clay brick (cb), making the facade brick (mfb) and firebrick (fb) has been selected from different regions and factories in tehran....

The German Meteorological Service (DWD) is charged with tasks of radiation protection by the Law of the Deutscher Wetterdienst (1955, 1998), the Precautionary Radiation Protection Act (1986) and the Radiation Protection Ordinance (2001). Since 1955 the DWD is responsible for the surveillance of radioactivity in the atmosphere realized by measuring the radioactivity as well as analyzing the mete...