Dielectrophoresis (DEP) is a separation method in which a non-uniform electric
field is used to induce a dipole moment in a suspended particle. If the polarization
of the particle is greater than that of the suspending medium, the particle will move
towards the region of higher field strength (positive DEP);...
Samples of pre-rigor sternomandibularis muscle from ten
steers were pressurized at 15,000 psi for two min at 35°C to investigate
the effects of pressurization and incubation time on
the thermal stability of collagen. Immediately after pressurization,
pH of the treated samples (pH 5.71) was significantly lower
(P < 0.05) than...
The effect of round shrimp post-catch age on the frozen shelf-life
characteristics of processed cooked meat was evaluated. Refrigerated
shrimp, one, three, and five days post-catch, were cooked,
mechanically peeled, frozen at -29°C and held for a period of twelve
months at -18°C. At three month intervals, samples were subjected...
We apply the Fishery Performance Indicators (FPIs) methodology to the Southeast Pacific Anchoveta Fishery off southern Peru and northern Chile. Our basic model of analysis is a production function framework, where the performance outcomes are a result of the available inputs. We measured all FPI categories (outcomes and input metrics)...
In plantation forests, competition from unwanted vegetation may reduce survival and negatively impact tree growth. The goal of this study was to examine the influence of vegetation management treatments on plant water relations and wood properties. Control trees (no treatment) were compared to trees subjected to post-planting competing vegetation control...
Agave salmiana is a native plant species harvested for the commercial production of mezcal (Agave spirits) in the highlands of central Mexico. The objective of this study was to identify vegetation changes in natural communities where A. salmiana has been differentially harvested for commercial purposes. Three plant community categories were...
Previous work has demonstrated selective feeding by bacterivorous protists on the of prey size. Other prey characteristics may also affect protist grazing rates. In this relative uptake rates of fluorescently labeled bacterial (FLB) cells made from starving bacteria (S-FLB), and of live-stained motile vs non-motile bacteria by marine We also...
We propose quantification of the activity of digestive enzymes as a novel way to estimate
rates of protist grazing in natural waters. Our first application of this approach was determination of
protistan bacterivory by assaying the activity of lysozyme at acid pH. Lysozyme specifically degrades
peptidoglycan, a major structural component...
There is an increasing interest in estimating biomass for longleaf pine (Pinus palustris Mill.), an important tree species in the southeastern U.S. Most of the individual-tree allometric models available for the species are local, relying on stem diameter outside bark at breast height (DBH) and total tree height (HT), but...
Aims:
While lateral root mass is readily detectable with ground penetrating radar (GPR), the roots beneath a tree (below-stump) and overlapping lateral roots near large trees are problematic for surface-based antennas operated in reflection mode. We sought to determine if tree size (DBH) effects GPR root detection proximal to longleaf...