Radiocarbon (14C) is commonly used as a tracer of the carbon cycle to determine how fast moves between different reservoirs such plants, soils, rivers, or oceans. However studies mostly emphasize mean value (as Δ14C) an unknown probability distribution. We introduce novel algorithm compute Δ14C distributions from knowledge age distribution in linear compartmental systems at steady-state. Our re...

The methylating capability of methamidophos, assayed by the formation of [7-14C]methylguanine in mouse liver, was investigated using a 14C-insecticide labelled at the O--CH3 group. Following i.p. administration of the toxicant, [7-14C]methylguanine could be isolated from liver nucleic acids of treated mice. The amount of 14C-label reached its maximum 6 h following administration of the insectic...

Factors affecting the production of [14C]patulin from [1-14C]acetate by replacement cultures of Penicillium patulum have been investigated. Incorporation of [1-14C]acetate into patulin reached a maximum with 6- to 8-day-old cultures incubated at 28 degrees C for 8 h in a replacement medium containing 0.1 M glucose, inorganic salts, and undiluted [1-14C]acetate. The specific activity of [14C]pat...

Methanogenesis has recently been shown to fuel anaerobic oxidation of methane (AOM) within the sulfate-reducing zone marine sediments, coining term “cryptic cycle”. Here we present research on relationship between methanogenesis and AOM in a shallow hypersaline pool (∼130 PSU) southern California coastal wetland. Sediment (top 20 cm) was subjected geochemical analyses, in-vitro slurry experimen...

This study examined the short term transfer of carbon-14 (14C) in common carp Cyprinus carpio under laboratory conditions. Various experiments were achieved order to investigate direct or trophic for 4 days, using waterborne 14C-labelled arginine food pellets respectively. Radiolabelled was prepared with glucose test how kinetics might vary biochemical form 14C. Elimination fish fed 5 days on r...

Alleviation of subsoil acidity with lime or gypsum increases carbon (C) accumulation in deep layers by stimulating root growth and C nitrogen (N) inputs at depth. However, the effects these amendments combined N fertilization on soil CO2 emissions remain controversial. We evaluated superficial application N-fertilizer dynamics microbial use efficiency (MicCUE) samples taken from topsoil (0–10 c...

OHNEDA, A., YAMAGATA, S., TSUTSUMI, K. and FuJIWARA, H. Distribution of Maltose Intravenously Administered to Rabbits and Its Metabolism in the Kidney. Tohoku J. exp. Med., 1974, 112 (2), 141-154 When 14C-U-maltose was injected intravenously to normal rabbits, 14C-maltose rapidly disappeared from the blood stream and circulating 14C-glucose rose gradually. In urine, 24% of total radioactivity w...

Clarithromycin (TE-031) is a newly synthesized macrolide with high stability in acidic conditions. In the present study, the pharmacokinetics of [N-methyl-14C]clarithromycin were compared with those of [N-methyl-14C]erythromycin in rats by radioassay and bioassay. Both radioactivity and bioactivity of [14C]clarithromycin in plasma and tissues were found to be significantly higher than those of ...