Neurophysiology

Contains research objectives and summary of research.National Institutes of Health (Grant 5 RO1 NB-07501-02)National Institutes of Health (Grant 5 P01 GM14940-03)Bell Telephone Laboratories IncorporatedNational Eye Institute (Grant 9 ROI EY00312-04)National Eye Institute (Grant 5 PO1 GM14940-03)National Institutes of Health (Grant 5 TO1 GM-01555-03

Neurophysiology

Contains research objectives and summary of research.National Institutes of Health (Grant 5 P01 GM14940-04)Bell Telephone Laboratories IncorporatedNational Eye Institute (Grant 5 RO1 EY00312-05)National Eye Institute (Grant 2 RO1 EY00377-04)National Institutes of Health (Grant 5 TO1 GM01555-04

Neurophysiology

Contains reports on two research projects.Bell Telephone Laboratories, IncorporatedNational Institutes of HealthTeagle Foundation, IncorporatedUnited States Air Force, Aeronautical Systems Division (Contract AF33(616)-7783

Communications Biophysics

Contains reports on two research projects.United States Air Force (Contract AF19(604)-4112)United States Air Force, Office of Scientific Research, Air Research and Development Command (Contract AF 61 (052)-107)Rockefeller Foundatio

Neurophysiology

Contains research objectives, summary of research and reports on six research objectives.National Institutes of Health (Grant 5 ROl NB-04985-05)National Institutes of Health (Grant NB-07501-02)National Institutes of Health (Grant NB-06251-03)National Institutes of Health (Grant NB-07576-02)U. S. Air Force (Aerospace Medical Division) under Contract AF33(615)-3885Bell Telephone Laboratories IncorporatedNational Institutes of Health (Grant 5 TO1 GM-01555-02

The effects of changing chemistry on the shock response of basic polymers

The shock response of four common semicrystalline thermoplastic polymers—polyethylene (PE), polyvinylchloride (PVC), polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE)—have been studied in terms of their Hugoniots, release velocities and shear strengths. Through the variations in behaviour caused by changes to the attached atoms to the carbon backbone, it has been possible to suggest that there are two main factors in play. The first is an electrostatic repulsion between adjacent polymer chains. Where this force is large, for example in PTFE with highly electronegative fluorine atoms, this results in this force dominating the shock response, with low shock velocities, high release velocities and little if no hardening behind the shock front. In contrast, in materials such as PE, this force is now weaker, due to the lower electronegativity of hydrogen, and hence this force is easier to overcome by the applied shock stress. Now the main factor affecting shock behaviour is controlled by the shape of the polymer chain allowing inter chain tangling (tacticity). This results in higher shock velocities, lower release speeds and significant hardening behind the shock front as the chains are forced together. This is prevalent in materials with a relatively open structure such as PE and is enhanced with the presence of large side groups or atoms off the main polymer chain

In vitro antimicrobial activities of novel anilinouracils which selectively inhibit DNA polymerase III of gram-positive bacteria

The 6-anilinouracils are novel dGTP analogs that selectively inhibit the replication-specific DNA polymerase III of gram-positive eubacteria. Two specific derivatives, IMAU (6-[3\u27-iodo-4\u27-methylanilino]uracil) and EMAU (6-[3\u27-ethyl-4\u27-methylanilino]uracil), were substituted with either a hydroxybutyl (HB) or a methoxybutyl (MB) group at their N3 positions to produce four agents: HB-EMAU, MB-EMAU, HB-IMAU, and MB-IMAU. These four new agents inhibited Staphylococcus aureus, coagulase-negative staphylococci, Enterococcus faecalis, and Enterococcus faecium. Time-kill assays and broth dilution testing confirmed bactericidal activity. These anilinouracil derivatives represent a novel class of antimicrobials with promising activities against gram-positive bacteria that are resistant to currently available agents, validating replication-specific DNA polymerase III as a new target for antimicrobial development

A Map of the Universe

We have produced a new conformal map of the universe illustrating recent discoveries, ranging from Kuiper belt objects in the Solar system, to the galaxies and quasars from the Sloan Digital Sky Survey. This map projection, based on the logarithm map of the complex plane, preserves shapes locally, and yet is able to display the entire range of astronomical scales from the Earth's neighborhood to the cosmic microwave background. The conformal nature of the projection, preserving shapes locally, may be of particular use for analyzing large scale structure. Prominent in the map is a Sloan Great Wall of galaxies 1.37 billion light years long, 80% longer than the Great Wall discovered by Geller and Huchra and therefore the largest observed structure in the universe.Comment: Figure 8, and additional material accessible on the web at: http://www.astro.princeton.edu/~mjuric/universe

Neurophysiology

Contains reports on sixo research projects.National Institutes of Health (Grant 5 RO1 NB-04985-03)National Institutes of Health (Grant 5 RO1 NB-4897-03)National Institutes of Health (Grant NB-06251-01)U.S. Air Force (Office of Scientific Research) under Grant AF-AFOSR-880-65U.S. Air Force (Research and Technology Division) under Contract AF33(615)-1747The Teagle Foundation, Inc. (Grant)Bell Telephone Laboratories, Inc. (Grant)Instrumentation Laboratory under the auspices of DSR Project 55-257Bioscience Division of National Aeronautics and Space Administratio

Annealing of amorphous FexCo100-x nanoparticles synthesized by a modified aqueous reduction using NaBH4

FexCo100−x nanoparticles were synthesized by aqueous reduction in iron (II) sulfate and cobalt (II) sulfate using sodium borohydride and sodium citrate. The initial concentrations of iron and cobalt were varied while maintaining an overall metal concentration of 4.60 mM. Increasing the cobalt content from 0 to 100 at. % decreased the magnetization saturation from 152 to 48 emu/g, as determined by room temperature vibrating sample magnetometry. Annealing the samples at 450 and 600 °C showed an increase in crystallite size. Powder x-ray diffraction and transmission electron microscopy was performed to determine the phases and morphology of the materials