18,957 research outputs found
Applicant Attraction Strategies: An Organizational Perspective
Developing labor shortages are expected to increase the importance of applicant attraction into the next century. Unfonunately, previous research has provided little in the way of unified theory or operational guidelines for organizations confronted with attraction difficulties. In part, this is because much research has been framed from the applicant\u27s, rather than the organization\u27s, perspective. In addition, attraction-related theories and research are scattered across a variety of literatures, and often identified primarily with topics other than attraction per se (e.g., wage, motivation, or discrimination theories). The present paper draws on multiple literatures to develop a model of applicant attraction from the organization\u27s perspective. In it, we (1) outline three general strategies for enhancing applicant attraction, (2) propose broad categories of contingency factors expected to affect the choice (and potential effectiveness) of alternative strategies, (3) suggest probable interrelationships among the strategies, (4) link applicant attraction strategies to other human resource practices, (5) outline various dimensions of attraction outcomes (e.g. qualitative and quantitative, attitudinal and behavioral, temporal), and (6) discuss implications for future attraction research
Phosphorylation of the Arp2 subunit relieves auto-inhibitory interactions for Arp2/3 complex activation.
Actin filament assembly by the actin-related protein (Arp) 2/3 complex is necessary to build many cellular structures, including lamellipodia at the leading edge of motile cells and phagocytic cups, and to move endosomes and intracellular pathogens. The crucial role of the Arp2/3 complex in cellular processes requires precise spatiotemporal regulation of its activity. While binding of nucleation-promoting factors (NPFs) has long been considered essential to Arp2/3 complex activity, we recently showed that phosphorylation of the Arp2 subunit is also necessary for Arp2/3 complex activation. Using molecular dynamics simulations and biochemical assays with recombinant Arp2/3 complex, we now show how phosphorylation of Arp2 induces conformational changes permitting activation. The simulations suggest that phosphorylation causes reorientation of Arp2 relative to Arp3 by destabilizing a network of salt-bridge interactions at the interface of the Arp2, Arp3, and ARPC4 subunits. Simulations also suggest a gain-of-function ARPC4 mutant that we show experimentally to have substantial activity in the absence of NPFs. We propose a model in which a network of auto-inhibitory salt-bridge interactions holds the Arp2 subunit in an inactive orientation. These auto-inhibitory interactions are destabilized upon phosphorylation of Arp2, allowing Arp2 to reorient to an activation-competent state
Characteristics of wake vortex generated by a Boeing 727 jet transport during two-segment and normal ILS approach flight paths
A series of flight tests was conducted to evaluate the vortex wake characteristics of a Boeing 727 (B727-200) aircraft during conventional and two-segment ILS approaches. Twelve flights of the B727, which was equipped with smoke generators for vortex marking, were flown and its vortex wake was intentionally encountered by a Lear Jet model 23 (LR-23) and a Piper Twin Comanche (PA-30). Location of the B727 vortex during landing approach was measured using a system of photo-theodolites. The tests showed that at a given separation distance there were no readily apparent differences in the upsets resulting from deliberate vortex encounters during the two types of approaches. Timed mappings of the position of the landing configuration vortices showed that they tended to descend approximately 91 m(300 ft) below the flight path of the B727. The flaps of the B727 have a dominant effect on the character of the trailed wake vortex. The clean wing produces a strong, concentrated vortex but as the flaps are lowered, the vortex system becomes more diffuse. Pilot opinion and roll acceleration data indicate that 4.5 n.mi. would be a minimum separation distance at which roll control of light aircraft (less than 5,670 kg (12,500 lb) could be maintained during parallel encounters of the B727's landing configuration wake. This minimum separation distance is generally in scale with results determined from previous tests of other aircraft using the small roll control criteria
U.S. CHAIN RESTAURANT EFFICIENCY
The growth of corporate food service firms and the resulting competition places increasing pressures on available resources and their efficient usage. This analysis measures efficiencies for U. S. chain restaurants and determines associations between managerial and operational characteristics. Using a ray-homothetic production function, frontiers were estimated for large and small restaurant chains. Technical and scale efficiencies were then derived for the firms. Finally, a Tobit analysis measured associations between technical efficiencies and firm characteristics. Results showed differences based on firm size, but factors such as experience, service format, unit size, and menu were strongly associated with efficiency, perhaps offsetting some firm size effects.Agribusiness,
Magnetic field-induced spectroscopy of forbidden optical transitions with application to lattice-based optical atomic clocks
We develop a method of spectroscopy that uses a weak static magnetic field to
enable direct optical excitation of forbidden electric-dipole transitions that
are otherwise prohibitively weak. The power of this scheme is demonstrated
using the important application of optical atomic clocks based on neutral atoms
confined to an optical lattice. The simple experimental implementation of this
method -- a single clock laser combined with a DC magnetic field-- relaxes
stringent requirements in current lattice-based clocks (e.g., magnetic field
shielding and light polarization), and could therefore expedite the realization
of the extraordinary performance level predicted for these clocks. We estimate
that a clock using alkaline earth-like atoms such as Yb could achieve a
fractional frequency uncertainty of well below 10^-17 for the metrologically
preferred even isotopes
Growing together in Christ : improving marital intimacy through conjoint prayer
https://place.asburyseminary.edu/ecommonsatsdissertations/1873/thumbnail.jp
The effects of mycorrhizal inoculant and micronutrients on early plant establshment during a tallgrass prairie reconstruction
Symbiotic relationships between mycorrhizal fungi and land plants are one of the most widespread examples of symbiosis on Earth yet there is still much to discover about their ecological impacts.
Prairie reconstructions are often done on highly disturbed sites such as reclaimed cropland, turf grass, and road rights-of-way. Disturbed soils often lack adequate quantities of both mycorrhizal fungi and micronutrients. I hypothesized that inoculated seeds with mycorrhizal spores or micronutrient seed treatments will aid in the early establishment of a tallgrass prairie.
To test this hypothesis four treatments (T1 control, T2 mycorrhizal, T3 micronutrient, and T4 mycorrhizal and micronutrient) were planted with a seed mixture of 36 native species (8 grasses and 28 forbs). This was a split block experiment with three replicates in each block, and individual plot size was 15 m2. Vegetation was examined using seedling count, basal coverage, above ground biomass, inflorescence count, and mycorrhizal colonization percentage.
There was a significant increase (p=0.006) in total native seedlings in the mycorrhizae plots over the control plots was seen in Year 1. In Year 2 increases of 51.7% (p=0.000), 41.5% (p=0.001), and 45.1% (p=0.000) in total native basal coverage were seen for the mycorrhizae, micronutrient, and combination treatments respectively over the control.
Neither the number of weed seedlings in Year 1 nor the basal coverage of weed species in Year 2 was significantly different among any of the treatments. Basal coverage of weeds was reduced in Year 2 though it was only marginally significant (p=0.102).
In Year 2 there was significantly (p=0.001) higher native biomass in in all treatments versus the control. Weed biomass was not significantly different although overall weed pressure was low and there was a high degree of variability in the data.
Mycorrhizae sampling revealed that there was approximately 42% (p=0.000) increase in mycorrhizal colonization in the treatments that had mycorrhizal inoculant added to the seed mixture than the plots that did not receive inoculant
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