Depletion study explanation

We conclude that the Li-poor stars definitely have different evolutionary histories to Li-normal plateau stars. A mass-transfer mechanism may explain the origin of these objects, but irrespective of whether this is the correct explanation, the Li-poor objects cannot be included in studies of Li depletion mechanisms that affect normal single stars. Consequently we conclude that the small (zero ) intrinsic spread in plateau Li abundances inferred by [25] is representative of normal halo stars, and thus signifies at most a small depletion in Li, <0.1 dex by the models of [17]. 

Explanation of Principal Application Codes 1 = screening 6 = reaction due to oxidation 2 = thermal stability 7 = runaway behavior (initial phase) 3 = sensitive thermal stability 8 = complete runaway behavior and 4 = very sensitive thermal stability simultaneous pressure measurements 5 = study autocatalysis, contaminations, 9 = time to maximum rate of reaction inhibitor depletion ... 

It has been proposed that sulfur-carbon bonds break at lower thermal stress than carbon-carbon bonds in sulfur-rich kerogens (24). Scission of sulfur-carbon bonds provides one explanation for the observed depletion of organosulfur compounds in the pyrolysates of high rank coals. The sulfur groups present in low rank coals are broken from the coal matrix to produce low molecular weight sulfur compounds which are not measured by the techniques used in this study. 

Using BDD anodes and MIO cathodes, enrichment of ammonia was also observed - in contradistinction to other studies using higher ammonium concentration and an Ir02 anode (Kim et al. 2005). In the combination of BDD anode/BDD cathode, nitrite was oxidised but only relatively slowly. When nitrate was electrolysed, its depletion was lower than 1 ppm for current densities lower than 200 A m-2. An explanation for the relatively low reaction rate between radicals and nitrite is the assumption that ozone or radicals are consumed in faster reactions such as peroxide formation and chlorine oxidation. OH radicals are also able to oxidise chloramines (Huie et al. 2005). 

In the UVB study we also measured malondialdehyde, a marker of lipid peroxidation, but were unable to detect any increase in response to UV light, in contrast to other reports. There are a number of possible explanations. In our experiment, a-tocopherol levels remained high after irradiation, and it is known that lipid peroxidation does not begin in in vitro membrane systems until a-tocopherol is completely depleted [29], Several studies have shown a time lag of one to several hours after irradiation to occur before a measurable increase in cutaneous lipid peroxidation can be detected [26-28] since skin was processed immediately in our experiments, lipid peroxidation may not have reached detectable limits. Finally, the TBARS assay for malondialdehyde is notoriously fraught with artifact and has a relatively high background [30], and noise levels may simply have been too high to detect peroxidation. Results... 

Potassium restriction was also associated with sodium retention and with calcium depletion in various studies. The converse is also true, giving one good explanation as to why potassium works so well. The mineral causes the body to excrete more sodium in the urine, the same mode of action achieved with antihypertensive drugs called thiazide diuretics. Potassium seems to correct salt sensitivity as well. 

---