MS 066 Guide to the Howard B. Hamilton, MD, papers; 1945-1997

The Howard B. Hamilton, MD, papers, MS 66, includes material from 1945-1997 related to the Atomic Bomb Casualty Commission (ABCC) and the Radiation Effects Research Foundation (RERF). Hamilton was the Chief of Clinical Laboratories for the Atomic Bomb Casualty Commission from 1956 until its dissolution in 1975. He served in the same capacity for the Radiation Effects Research Foundation, which succeeded the ABCC, until 1984. This collection encompasses this period of time in Dr. Hamilton\u27s career, as well as his related scholarly work after his retirement from RERF. Dr. Hamilton donated his collection of letters, reprints, newspaper articles, photographs, memos, and ephemera to the John P. McGovern Historical Collections and Research Center between 1985 and 2002. The collection is in good condition and consists of 3.75 cubic feet (10 boxes)

The Efficacy and Toxicity of Bupropion in the Elderly

Bupropion is an antidepressant with excellent tolerability and few side effects or drug interactions. These characteristics suite it well for use both in the elderly and in the medically ill. However, early reports of seizures with bupropion therapy in patients with bulimia limited its use. The pharmacology, efficacy, toxicity, and side effect profile of both the immediate release (IR) and the recently available sustained release (SR) formulations of bupropion are reviewed. Bupropion SR is associated with a reduced seizure incidence (0.1%) compared to that found with the IR formulation (0.4%). Recent reports, however, demonstrate that the half-life of bupropion is prolonged in the elderly and that the elderly accumulate bupropion metabolites. Potential toxic effects, including seizures and psychosis, may result from high bupropion plasma levels and the accumulation of bupropion metabolites in the elderly or in those with impaired renal or liver function. Clinical reports in the elderly demonstrate that lower (75-225 mg/day) doses of bupropion are associated with fewer side effects and equal efficacy to that found with higher doses. Bupropion is a good antidepressant choice for the elderly and the medically ill, provided additional precautions, including the use of low doses, are taken. Bupropion should either be avoided or be used with extreme caution in anyone who is at increased risk of seizures or who has a history of psychosis or an eating disorder

Discussion of the Paper by David A. Scola, M.D. on “The Hemispheric Specialization of the Human Brain and Its Application to Psychoanalytic Principles”

Dr. Scola proposes a bold and far-reaching synthesis of psychoanalytic theory, developmental neurobiology and neurophysiology of behavior. Freud found this task so frustrating in 1895 that he renounced neurology in favor of a purely psychologic approach (or so Freud claimed; Frank Sulloway sees it differently). Hypotheses that unconscious mental life is situated in the right cerebrum and that defense mechanisms are related to neuroanatomic connections are intriguing. The presentation does not include evidence which contravenes these theories. Sperry presented some evidence that the right hemisphere is self-aware and self-evaluative (I). One great problem in all cross disciplinary studies is the difference in terminology and definitions from various fields. Now that Dr. Scola has set forth his theory, the real work begins: to collect data to substantiate it. The first and most direct method is the classical neurologic observation of patients with specific lesions . This method has been used from the time of Wernicke and Freud himself, down to the late great Alexander Luria. Epidemiologic data such as that linking familial tendency to dyslexia , autoimmune disease, migraine and lefthandedness may be important. Finally, the opportunity to do careful experimental work may come, such as that which won Sperry the Nobel Prize in 1981

Time since fire and average fire interval are the best predictors of Phytophthora cinnamomi activity in heathlands of south-western Australia

Fires are features of ecological communities in much of Australia; however, very little is still known about the potential impact of fire on plant diseases in the natural environment. Phytophthora cinnamomi is an introduced soil-borne plant pathogen with a wide host range, affecting a large proportion of native plant species in Australia and other regions of the world, but its interaction with fire is poorly understood. An investigation of the effects of fire on P. cinnamomi activity was undertaken in the Stirling Range National Park of south-western Australia, where fire is used as a management tool to reduce the negative impact of wildfires and more than 60% of the park is infested with, and 48% of woody plant species are known to be susceptible to, P. cinnamomi. At eight sites confirmed to be infested with P. cinnamomi, the proportion of dead and dying susceptible species was used as a proxy for P. cinnamomi activity. Subset modelling was used to determine the interactive effects of latest fire interval, average fire interval, soil water-holding capacity and pH on P. cinnamomi activity. It was found that the latest and average fire interval were the variables that best explained the variation in the percentage of dead and dying susceptible species among sites, indicating that fire in P. cinnamomi-infested communities has the potential to increase both the severity and extent of disease in native plant communities

An analysis of the FIR/RADIO Continuum Correlation in the Small Magellanic Cloud

The local correlation between far-infrared (FIR) emission and radio-continuum (RC) emission for the Small Magellanic Cloud (SMC) is investigated over scales from 3 kpc to 0.01 kpc. Here, we report good FIR/RC correlation down to ~15 pc. The reciprocal slope of the FIR/RC emission correlation (RC/FIR) in the SMC is shown to be greatest in the most active star forming regions with a power law slope of ~1.14 indicating that the RC emission increases faster than the FIR emission. The slope of the other regions and the SMC are much flatter and in the range of 0.63-0.85. The slopes tend to follow the thermal fractions of the regions which range from 0.5 to 0.95. The thermal fraction of the RC emission alone can provide the expected FIR/RC correlation. The results are consistent with a common source for ultraviolet (UV) photons heating dust and Cosmic Ray electrons (CRe-s) diffusing away from the star forming regions. Since the CRe-s appear to escape the SMC so readily, the results here may not provide support for coupling between the local gas density and the magnetic field intensity.Comment: 19 pages, 7 Figure

Diffusion Time-Scale Invariance, Markovization Processes and Memory Effects in Lennard-Jones Liquids

We report the results of calculation of diffusion coefficients for Lennard-Jones liquids, based on the idea of time-scale invariance of relaxation processes in liquids. The results were compared with the molecular dynamics data for Lennard-Jones system and a good agreement of our theory with these data over a wide range of densities and temperatures was obtained. By calculations of the non-Markovity parameter we have estimated numerically statistical memory effects of diffusion in detail.Comment: 10 pages, 3 figure

Treatment of Inborn Errors of Urea Synthesis — Activation of Alternative Pathways of Waste Nitrogen Synthesis and Excretion

Abstract Children with inborn errors of urea synthesis accumulate ammonium and other nitrogenous precursors of urea, leading to episodic coma and a high mortality rate. We used alternative pathways for the excretion of waste nitrogen as substitutes for the defective ureagenic pathways in 26 infants. These pathways involve synthesis and excretion of hippurate after sodium benzoate administration, and of citrulline and argininosuccinate after arginine supplementation. The children were treated for seven to 62 months; 22 survived. The mean plasma level of ammonium (±S.E.) was 36±2 μmol per liter, and that of benzoate was 1.5±1.0 mg per deciliter. Alternative pathways accounted for between 28 and 59 per cent of the total effective excretion of waste nitrogen. Nineteen infants had normal height, weight, and head circumference, and 13 had normal intellectual development. Activation of alternative pathways of waste nitrogen excretion can prolong survival and improve clinical outcome in children with inborn errors of urea synthesis. (N Engl J Med. 1982; 306:1387–92.

Microtubule depolymerization by the kinesin-8 motor Kip3p: a mathematical model

Proteins from the kinesin-8 family promote microtubule (MT) depolymerization, a process thought to be important for the control of microtubule length in living cells. In addition to this MT shortening activity, kinesin 8s are motors that show plus-end directed motility on MTs. Here we describe a simple model that incorporates directional motion and destabilization of the MT plus end by kinesin 8. Our model quantitatively reproduces the key features of length-vs-time traces for stabilized MTs in the presence of purified kinesin 8, including length-dependent depolymerization. Comparison of model predictions with experiments suggests that kinesin 8 depolymerizes processively, i.e., one motor can remove multiple tubulin dimers from a stabilized MT. Fluctuations in MT length as a function of time are related to depolymerization processivity. We have also determined the parameter regime in which the rate of MT depolymerization is length dependent: length-dependent depolymerization occurs only when MTs are sufficiently short; this crossover is sensitive to the bulk motor concentration.Comment: 34 pages, 11 figure