A study was conducted to identify geographical variation in loblolly pine bark and wood properties at the whole-tree level and to quantify the responses in whole-tree
bark and wood properties following contrasting silvicultural practices that included planting density, weed control, and fertilization. Trees were destructively sampled from
both conventionally managed...
Tannins are a diverse group of plant-produced, polyphenolic compounds with metal-chelating and antimicrobial properties that are prevalent in many soils. Using transcriptomics, we determined that tannic acid, a form of hydrolysable tannin, broadly affects the expression of genes involved in iron and zinc homeostases, sulfur metabolism, biofilm formation, motility, and...
The soil bacterium Pseudomonas protegens Pf-5 (previously called P. fluorescens Pf-5) produces two siderophores, enantio-pyochelin and a compound in the large and diverse pyoverdine family. Using high-resolution mass spectroscopy, we determined the structure of the pyoverdine produced by Pf-5. In addition to producing its own siderophores, Pf-5 also utilizes ferric...
One of the most important micronutrients for bacterial growth is iron, whose bioavailability in soil is limited. Consequently, rhizospheric bacteria such as Pseudomonas fluorescens employ a range of mechanisms to acquire or compete for iron. We investigated the transcriptomic and proteomic effects of iron limitation on P. fluorescens Pf-5 by...
The Advanced Test Reactor (ATR) is conducting
scoping studies for the conversion of its fuel from a
highly enriched uranium (HEU) composition to a low-enriched
uranium (LEU) composition, through the
Reduced Enrichment for Research and Test Reactors
Program, within the Global Threat Reduction Initiative.
These studies have considered a wide...
Wide-angle and vertical incidence seismic data from Seismic Hazards Investigations in Puget Sound (SHIPS), gravity modeling, and seismicity are used to derive two-dimensional crustal models beneath the Strait of Juan de Fuca. The Eocene volcanic Crescent-Siletz terrane is significantly thicker than previously recognized and extends from near the surface to...
We report the construction of a three-dimensional template bank for the search for gravitational waves
from inspiralling binaries consisting of spinning compact objects. The parameter space consists of two
dimensions describing the mass parameters and one “reduced-spin” parameter, which describes the secular
(nonprecessing) spin effects in the waveform. The template...
Log and core data document gas saturations as high as
90% in a coarse-grained turbidite sequence beneath the gas
hydrate stability zone (GHSZ) at south Hydrate Ridge, in the
Cascadia accretionary complex. The geometry of this gas-saturated
bed is defined by a strong, negative-polarity
reflection in 3D seismic data. Because...
The effect of three different weed management strategies, non-weeding, hand weeding, and weed mat, were examined on physicochemical, sugar profile, and antioxidant properties of two cultivars of blackberry (Rubus spp), ’Marion’ and ’Black Diamond’ harvested at three time intervals during the 2012 season. Sensory analysis on flavor intensity of six...
Background: Improved maps of species distributions are important for effective management of wildlife under increasing anthropogenic pressures. Recent advances in lidar and radar remote sensing have shown considerable potential for mapping forest structure and habitat characteristics across landscapes. However, their relative efficacies and integrated use in habitat mapping remain largely...