United States Department of the Army

About: United States Department of the Army is a government organization based out in Arlington, Virginia, United States. It is known for research contribution in the topics: Poison control & Population. The organization has 32668 authors who have published 42453 publications receiving 947075 citations. The organization is also known as: DA & U.S. Department of the Army.

Electrostatic Multilayer Deposition of a Gold−Dendrimer Nanocomposite

Abstract: Poly(amidoamine) (PAMAM) dendrimers can be used as a polymeric template/stabilizer/reservoir to prepare stable gold−dendrimer nanocomposites by reducing PAMAM−tetrachloroaurate polysalts using hydrazine. In the gold−dendrimer nanocomposite, the presence of elemental gold is indicated by its characteristic plasmon absorption peak at 529 nm in aqueous solution and is visualized by transmission electron microscopy (TEM) equipped with energy-dispersive X-ray spectroscopy (EDXS). Electrostatic layer-by-layer assembly of the gold−dendrimer nanocomposite using poly(sodium 4-styrenesulfonate) (PSS) as the oppositely charged polyelectrolyte leading to nanoscale uniform multilayers of gold−dendrimer nanoclusters is reported. UV−vis absorption spectra from the consecutive multilayers indicated that each bilayer growth is regular, even though a 20 nm absorption bathochromic shift takes place in the film. TEM of PSS/gold−dendrimer nanocomposite film demonstrates that gold nanoparticles (5−20 nm) appear as aggregates w...

Fresh whole blood transfusion: a controversial military practice.

Abstract: The transfusion of fresh whole blood (FWB) for trauma-induced coagulopathy is unusual in civilian practice. However, US military physicians have used FWB in every combat operation since the practice was introduced in World War I and continue to do so during current military operations. We discuss our review of all blood products administered to US military casualties in Operation Iraqi Freedom (OIF) between March and December 2003. FWB transfusions were most frequent when demands for massive transfusions wiped out existing blood supplies. FWB patients had the highest blood product requirements; however, mortality did not differ significantly between FWB and non-FWB patients overall or for massively transfused patients. We review the current military practice of FWB transfusion in combat theaters and conclude that FWB transfusion is convenient, safe, and effective in certain military situations.

Applications of cellulases.

Abstract: Acto 523, 133-146 Shoemaker, S. P. & Brown, R. D., Jr. (1978b) Biochim. Biophys. Acra 523. 147-161 Shoemaker, S., Schweickart, V., Ladner, M., Gelfand, D., Kwok, S., Myambo, K. & Innis, M. (1983) Biofechnology October issue, 69 1 6 9 6 Sternberg, D. & Mandels, G . R. (1979) J . Bacteriol. 139, 761769 Stewart, B. J . & Leatherwood, J . M. (1976) J. Bacteriol. 129,609615 Teeri, T., Salovuori, 1. & Knowles, J . (1983) Biofechnology October issue, 696699 Vaheri, M. P., Vaheri, M. E. 0. & Kauppinen, V. S. (1979) Eur. J. Appl. Microbiol. Biotechnol. 8, 73-80 Weber, M., Foglietti, M. J. & Percheron, F. (1980) J. Chromatogr.

Ultrashort pulse propagation at the photonic band edge : large tunable group delay with minimal distortion and loss

Abstract: We examine optical pulse propagation through a 30-period, GaAs/AlAs, one-dimensional, periodic structure at the photonic band-edge transmission resonance. We predict theoretically---and demonstrate experimentally---an approximate energy, momentum, and form invariance of the transmitted pulse, as well as large group index (up to 13.5). The group index is tunable and many orders of magnitude more sensitive to variation in material refractive index than for bulk material. We interpret this observation in terms of time-dependent electromagnetic states of the pulse-crystal system.