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  • Book
    Timothy Schultheiss.
    Summary: This book covers every aspect of radiation myelopathy and considers the evidence from all species in which it has been studied. The historical and current understanding of the pathogenesis of this rare but devastating injury is first discussed. The evidence regarding the role of a variety of factors in radiation myelopathy is then reviewed. Readers will find detailed information on the impacts of total radiation dose, radiation volume, dose fractionation, hyper fractionation, age, anatomic level, comorbidities, radiation modifiers, other therapies, and retreatment of the spinal cord. Given the similarity of the pathogenesis of radiation myelopathy in humans and experimental animals, the potential for cross-species modelling of dose response is explored, with attention to relevant species differences. Treatment of the condition is also fully considered. New theories are presented regarding retreatment, small volume response, and the final step in white matter necrosis. The final chapter addresses the medicolegal issues elicited by radiation myelopathy, which is often the result of treatment error. Radiation Myelopathy will be of high value for radiation oncologists, radiation physicists, dosimetrists, biologists, neurologists, medical oncologists, and attorneys.

    Contents:
    History
    Pathogenesis of radiation myelopathy
    Clinical radiation myelopathy
    Radiation myelopathy in stereotactic radiosurgery
    Experimental studies on fractionation effects
    Experimental studies on volume effects
    Other clinical and experimental studies
    Multispecies dose response model
    Treatment of myelopathy
    Medico-legal issues.
    Digital Access Springer 2022
  • Article
    Taylor FR, Parks LW.
    J Bacteriol. 1978 Nov;136(2):531-7.
    The interconversion of free and esterified sterols was followed radioisotopically with [U-14C]acetate and [methyl-14C]methionine. In pulse-chase experiments, radioactivity first appeared mainly in unesterified sterols in exponential-phase cells. Within one generation time, the label equilibrated between the free and esterified sterol pools and subsequently accumulated in steryl esters in stationary-phase cells. When the sterol pools were prelabeled by growing cells aerobically to the stationary phase and the cells were diluted into unlabeled medium, the prelabeled steryl esters returned to the free sterol form under several conditions. (i) During aerobic growth, the prelabeled sterols decreased from 80% to 45% esters in the early exponential phase and then returned to 80% esters as the culture reached the stationary phase. (ii) Under anaerobic conditions, the percentage of prelabeled steryl esters declined continuously. When growth stopped, only 15% of the sterols remained esterified. (iii) In the presence of an inhibitor of sterol biosynthesis, which causes accumulation of a precursor to ergosterol, prelabeled sterols decreased to 40% steryl esters while the precursor was found preferentially in the esterified form. These results indicate that the bulk of the free sterol and steryl ester pools are freely interconvertible, with the steryl esters serving as a supply of free sterols. Furthermore, there is an active cellular control over what types of sterol are found in the free and esterified sterol pools.
    Digital Access Access Options