The effect of (-)-carnitine on the conversion of citratel-r4C and pyruvate-2J4C to 14C02 and either 14C-fatty acids or 14C-acetylsulfanilamide was studied in pigeon liver homogenates. Carnitine stimulated the conversion of pyruvate-2-W to fatty acids and acetylsulfanilamide, but had no effect on citrate. In the fasted state both fatty acid synthesis and citrate cleavage enzyme activity were dec...

Accelerator mass spectrometry (AMS) radiocarbon dating a continuous core from Lake Gun Nur, northern Mongolia, shows a period between 10 and 8 ka BP that could not be dated accurately. Further dating on alkali-insoluble residue and humic acid from the same samples in the Gun Nur core suggest that this AMS 14C date anomaly is neither analytical nor material related. We hypothesize that the 14C a...

Exposure of growing Mycobacterium tuberculosis BCG to I pg. isoniazid/ml. inhibited the incorporation of 14C from [U-14C] and [2-1*C]glycerol and [ 1-14C]glutamate into its walls by about 50 :A over I 2 h. because 14C incorporation into the mycolic acids of the walls was prevented. Isoniazid, 0.5 ,ug./ml. with M. tuberculosis BCG or 0.1 pg./ml. with M. tuberculosis ~ 3 7 R a , inhibited incorpo...

We investigate the potential of quartz-based OSL-dating for application to heated sandy sediments that are closely associated with remains charcoal production (charcoal kilns). This is particularly relevant post-1650 CE features, where 14C-dating lacks resolution. first document general OSL characteristics using large aliquots sand-sized quartz. Results from procedural tests indicate laboratory...

Physical weathering in cold, steep bedrock hillslopes occurs at rates that are thought to depend on temperature, but our ability quantify the temperature-dependence of erosion remains limited when integrating over geomorphic timescales. Here, we present results from a 1D numerical model in-situ cosmogenic 10Be, 14C, and 3He concentrations evolve as function rate, style, ground surface temperatu...

a possible relationship between the effect of aldosterone upon urinary electrolytes and the incorporation of [14C]riboflavin into renal [14C]flavin mononucleotide (FMN) and [14C]flavin adenine dinucleotide (FAD). Adrenalectomized Sprague-Dawley rats that weighed between 185 and 210 g were pretreated with 15 ,ug/100 g body wt dexamethasone intraperitoneally. 16 h later they were administered ald...

The CO2-ratios method is applied to the analysis of abnormalities of TCA (tricarboxylic acid)-cycle metabolism in AS-30D rat ascites-hepatoma cells. This method utilizes steady-state 14CO2-production rates from pairs of tracers of the same compound to evaluate TCA-cycle flux patterns. Equations are presented that quantitatively convert CO2 ratios into estimates of probability of flux through TC...