Biological recovery

Low cortisol levels may impede the process of biologic recovery from stress, resulting in a cascade of alterations that lead to intrusive recollections of the event, avoidance of reminders of the event, and symptoms of hyperarousal. This failure may represent an alternative trajectory to the normal process of adaptation and recovery after a traumatic event. 

High mass and biological recoveries of the target products)... 

Uni-uni pathway Typified by simple distribution process and kinetics, narrow bandwidth with high mass and biological recovery may be characterized by very rapid interconversion kinetics as the solute transverses the chromatographic bed as a single, time-averaged structure. 

Buffer compatibility Mechanical rigidity Limiting pressure drop Separation speed Deformation properties Particle size distribution Pore size distribution Thermal stability Chemical stability pH limitation Specific surface area Resolution Capacity Mass recovery Biological recovery Regeneration in base Cost ( per g)... 

Kirchner J. W. and Weil A. (2000) Delayed biological recovery from extinctions throughout the fossil record. Nature 404, 177-180. 

The theory in simple in practice it is a matter of economics as to whether the added steps in gold recovery are worthwhile. If a company sends in a sample containing on the average 2.5 g of gold per metric ton of ore, what could be the maximum additional capital and operating costs per ton of ore if the additional biological recovery step is to be employed ... 

The results strongly supported the hypothesis that damage present on the DNA template at the time of entry into the proliferative cycles was responsible for cellular toxicity. Further, the results showed that the repair process was actually effective in achieving biological recovery. 

Some future goals for both CLRTAP and EU policy include the adoption of transboundary air pollution regulations that address particulate matter and a continued effort in scientific research (i.e. active measures such as technological improvements for stationary and mobile pollution sources and preventative measure such as improving knowledge of biological recovery of eutrophied and acidified waterways). In addition, the impacts of particulate matter on climate change and vice-versa need to be better understood. 

As chemical conditions in soils and surface waters improve, biological recovery is enhanced. Biological recovery is likely to occur in stages, since not all organisms can recover at the same rate and may vary in their sensi-... 

Terrestrial recovery is even more difficult to project than aquatic recovery. Given the life span of trees and the delay in the response of soil to decreases in acidic deposition, it is reasonable to suggest that decades will be required for affected trees on sensitive sites to recover once chemical conditions in the soil are restored. Overall, the timing and extent of chemi cal and biological recovery depend on how soon and how significantly emissions that cause acidic deposition are reduced. Moreover, human influences (e.g., land disturbance, introduction of exotic or invasive species), in addition to acidic deposition, can delay biological recovery after chemical recovery has occurred. 

The biological impact due to increased acidification of sea and dissolution of coral matter could be detrimental and irreversible. That is because the timescales of physical dissolution and biological recovery are different. Dissolution and precipitation processes of aqueous CaC03 solutions are controlled by acid-base chemistry these processes are thermodynamically driven. 

FIGURE 5. Biological recovery of normal fibroblasts (NF) and lack of recovery of XP12BE cells from the cytotoxic effect of UV radiation. Cells were grown to confluence as described, irradiated with the designated doses of UV, released immediately, and assayed for survival (O, A) or held 7 days in the absence of cell replication (0.5% turnover per 24 hr) and then assayed for survival (, A). Unirradiated control cells were similarly treated and assayed. (O, ) NF (A, A) XP. 

Simonshas recently demonstrated a similar biological recovery of XP cells from group D from 9 to 40% in 24 hr. However, Weichselbaum et... 

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