Wright-Patterson Air Force Base

About: Wright-Patterson Air Force Base is a other organization based out in Wright-Patterson AFB, Ohio, United States. It is known for research contribution in the topics: Laser & Microstructure. The organization has 5817 authors who have published 9157 publications receiving 292559 citations. The organization is also known as: Wright-Patterson AFB & FFO.

Mechanical Properties of Polycrystalline TiC

Abstract: The mechanical properties of fine-grained polycrystalline TiC were studied using both four-point bending and compression tests The ductile-brittle transition (D-B) temperature in compression was determined to be =800°C and was found to depend on grain size Yield-point behavior was observed for the first time in fine-grained TiC deformed in compression and was found to depend on grain size and test temperature The yield stress as a function of grain size can be described by a Hall-Petch type of relation, ie yield stress α (grain size)-1/2 The dislocations resulting from deformation in compression at lower temperatures were predominately screw in character, with edge dipoles and dislocation loops being present As the temperature of deformation was increased, the dipoles and loops were gradually annihilated by climb and the dislocations were observed in the form of hexagonal networks with a much-reduced dislocation density A plot of log yield stress vs 1/T showed a change in slope, which suggests that two rate-controlling mechanisms are in operation during deformation at different test temperatures Thermal activation analysis at T = 1050° to 1500°C suggested that the rate controlling mechanism during deformation in this temperature range is associated with cross slip

Isolation and characterization of Lactobacillus-derived membrane vesicles.

Abstract: Bacterial membrane vesicles have been implicated in a broad range of functions in microbial communities from pathogenesis to gene transfer. Though first thought to be a phenomenon associated with Gram-negative bacteria, vesicle production in Staphylococcus aureus, Lactobacillus plantarum, and other Gram-positives has recently been described. Given that many Lactobacillus species are Generally Regarded as Safe and often employed as probiotics, the engineering of Lactobacillus membrane vesicles presents a new avenue for the development of therapeutics and vaccines. Here we characterize and compare the membrane vesicles (MVs) from three different Lactobacillus species (L. acidophilus ATCC 53544, L. casei ATCC 393, and L. reuteri ATCC 23272), with the aim of developing future strategies for vesicle engineering. We characterize the vesicles from each Lactobacillus species comparing the physiochemical properties and protein composition of each. More than 80 protein components from Lactobacillus-derived MVs were identified, including some that were enriched in the vesicles themselves suggesting vesicles as a vehicle for antimicrobial delivery. Additionally, for each species vesicular proteins were categorized based on biological pathway and examined for subcellular localization signals in an effort to identify possible sorting mechanisms for MV proteins.

Surrogate mixtures to represent complex aviation and rocket fuels

Abstract: Surrogate mixtures of one to 10 hydrocarbons that have similar properties to aviation fuels are desirable for experimental and computationaltractability and reproducibility. However, aviation fuels, such as Jet A, JP-8, and JP-5, contain hundreds of hydrocarbons. This paper describes appropriate “surrogate” mixtures to reproduce the behavior of multicomponent aviation fuels. Surrogate mixtures from the literature and their applicability to various situations are summarized.

Elucidation of Peptide Effects that Control the Activity of Nanoparticles

Abstract: Natural processes have been developed to produce nanostructures that involve recognition between biomolecules and inorganic surfaces. Such methods have been exploited in the production of nanomaterials for use as catalysts, biosensors, batteries, and components for directed assembly; however, the interactions at the biotic/abiotic interface remain unclear. These interactions are likely to control the activity of the nanostructures, which could be optimized based upon the peptide sequence and arrangement on the nanomaterial surface. Whilst these studies have demonstrated the unique activity of such bio-enabled materials, to the best of our knowledge, no research is available that probes the critical effects of the surface peptide on nanomaterial activity. Previous reports have suggested that peptides bind to surfaces in a different manner to individual amino acids; 9] therefore, by understanding these interactions, the design of bionanomaterials that have superior functionality may be possible. The Pd4 peptide (Table 1), was isolated using a phage display technique with an affinity for palladium. 9] Using this sequence, palladium particles, which have a diameter of approximately 1.9 nm, were prepared that were active for Stille coupling reactions in water, at room temperature, with palladium loadings of 0.005 mol % (Scheme 1). Modeling of the peptide–nanoparticle interactions suggested that the histidine residues at positions 6 and 11 were most likely