Temporal development, release

Fig. 50. Temporal development of the intensity below the peak for the 020 ( ) (temporal resolution 30 s) and 113 (o) (temporal resolution 10 s) reflections upon rapid stretching of polyisobutyleneAs the fibre is released (R) the intensity drops back to the original value...

Differences in the temporal development of release rates for the individual elements are connected with their sorption/desorption behaviour, which is primarily due to pH-effects but may also be influenced by com-plexation, e.g. by elevated concentrations of chloride ions. With respect to the pH-effects, however, there are significant differences in the response of the various solid substrates to the addition of H+-ions, and it may be argued that the pH-values on the solid surfaces -which can be estimated from "pH-titration tests" - are decisive for the behavior of the particular element rather than the pH-values determined in solution. 

Fig. 1-15. Temporal development of CO, H2, and N20 mixing ratios in a fixed volume of air in contact with natural soils. An increase in the mixing ratio indicates that the trace gas is released from the soil, whereas a decline indicates that it is absorbed. In all cases shown, a temperature-dependent steady-state level is reached after a certain time regardless of the initial mixing ratio. The dashed lines indicate typical mixing ratio in ambient continental air. When this is higher than the steady-state level, the soil acts as a sink otherwise it provides a source for the trace gas. [Data were taken from Seiler (1978) and Seiler and Conrad (1981).]...

The temporal development of the displacement pro file reflects the presence of restricted motion, which may be studied in detail. Examples are motion inside compartments, between compartments, and motion of the compartment itself We may anticipate progress in the use of PFG NMR methods to study release mechanisms and kinetics from emulsion carriers. 

Some researchers believe the reason some abused children develop MPD may have a biological basis. Studies of how brain chemistry affects memory indicate that when an intensely traumatic experience occurs, the brain s neurochemicals may be released in such large amounts they influence the area of the brain responsible for memory to pigeonhole what is remembered into separate compartments. Depending on their individual brain chemistry, some human beings may be better able to disassociate than others. About a third of people with MPD have complex partial seizures of the right temporal lobe of the brain. Some researchers think this form of epilepsy might also affect memory and be yd another cause for the disorder. 

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