A Study of the Oviposition and Nymphal Development of \u3cem\u3eParatrioza cockerelli\u3c/em\u3e (Sulc) Upon Various Host Plants

The potato psyllid, Paratrioza cockerelli (Sulc) as stated by E. O. Essig, (1917) is a native of the western states. Since the great outbreak of psyllid yellows in Utah potato fields in 1927 much interest has been given to this insect. The close relationship between the nymphs of P. cockerelli and the disease, psyllid yellows, is a well known fact, but as yet the causative factor by which this disease is produced still remains unknown. Because of the serverity of the disease to potatoes and the importance of knowing something of the host plants of P. cockerelli, the writer, upon the suggestion of Dr. G. F. Knowlton, began a study to, so far as possible, determine the uncultivated and cultivated host plants of this insect. The native plants of the solanaceous group used in these experiments were collected from Utah; other species of the potato family used were obtained from Dr. S. P. Doolittle of the U. S. D. A. Bureau of Plant Industry; Professor F. G. Weber, of the Florida Agricultural Experiment Station; and Dr. R. W. Samson of the Purdue University

Examining public service motivation in the voluntary sector: implications for public management

Building on research about the nature of Public Service Motivation (PSM) and its application outside the public sector, the authors provide a qualitative based examination of PSM's relevance to voluntary sector employees. In doing so, they explore how far their motivations extend beyond those encompassed within current conceptualisations of PSM and whether PSM research can be enriched through the adoption of qualitative methodologies. The findings suggest that PSM accounts for some, but not all, of the motives of voluntary sector employees and indicate that public sector managers involved in outsourcing public services need to be sensitive to their distinctive features

Differential chemical abundance analysis of a 47 Tuc AGB star with respect to Arcturus

This study resolves a discrepancy in the abundance of Zr in the 47 Tucanae asymptotic giant branch star Lee 2525. This star was observed using the echelle spectrograph on the 2.3 m telescope at Siding Spring Observatory. The analysis was undertaken by calibrating Lee 2525 with respect to the standard giant star Arcturus. This work emphasises the importance of using a standard star with stellar parameters comparable to the star under analysis rather than a calibration with respect to the Sun (Koch & McWilliam 2008). Systematic errors in the analysis process are then minimised due to the similarity in atmospheric structure between the standard and programme stars. The abundances derived for Lee 2525 were found to be in general agreement with the Brown & Wallerstein (1992) values except for Zr. In this study Zr has a similar enhancement ([Zr/Fe] = +0.51 dex) to another light s-process element, Y ([Y/Fe] = +0.53 dex), which reflects current theory regarding the enrichment of s-process elements by nuclear processes within AGB stars (Busso et al. 2001). This is contrary to the results of Brown & Wallerstein (1992) where Zr was under-abundant ([Zr/Fe] = +0.51 dex) and Y was over-abundant ([Y/Fe] = +0.50 dex) with respect to Fe.Comment: 11 pages, 5 figures Accepted for publication in MNRA

Beyond the Brim of the Hat: Kinematics of Globular Clusters out to Large Radius in the Sombrero Galaxy

We have obtained radial velocity measurements for 51 new globular clusters around the Sombrero galaxy. These measurements were obtained using spectroscopic observations from the AAOmega spectrograph on the Anglo-Australian Telescope and the Hydra spectrograph at WIYN. Combined with our own past measurements and velocity measurements obtained from the literature we have constructed a large database of radial velocities that contains a total of 360 confirmed globular clusters. Previous studies' analyses of the kinematics and mass profile of the Sombrero globular cluster system have been constrained to the inner ~9' (~24 kpc or ~5 effective radii), but our new measurements have increased the radial coverage of the data, allowing us to determine the kinematic properties of M104 out to ~15' (~41 kpc or ~9 effective radii). We use our set of radial velocities to study the GC system kinematics and to determine the mass profile and V-band mass-to-light profile of the galaxy. We find that the V-band mass-to-light ratio increases from 4.5 at the center to a value of 20.9 at 41 kpc (~9 effective radii or 15'), which implies that the dark matter halo extends to the edge of our available data set. We compare our mass profile at 20 kpc (~4 effective radii or ~7.4') to the mass computed from x-ray data and find good agreement. We also use our data to look for rotation in the globular cluster system as a whole, as well as in the red and blue subpopulations. We find no evidence for significant rotation in any of these samples.Comment: Accepted for publication in the Astronomical Journal; 23 pages, 14 figures, and 2 table

Comparison of NOAA-9 ERBE measurements with Cirrus IFO satellite and aircraft measurements

Earth Radiation Budget Experiment (ERBE) measurements onboard the NOAA-9 are compared for consistency with satellite and aircraft measurements made during the Cirrus Intensive Field Observation (IFO) of October 1986. ERBE scene identification is compared with NOAA-9 TIROS Operational Vertical Sounder (TOVS) cloud retrievals; results from the ERBE spectral inversion algorithms are compared with High resolution Interferometer Sounder (HIS) measurements; and ERBE radiant existance measurements are compared with aircraft radiative flux measurements

Information dynamics shape the networks of Internet-mediated prostitution

Like many other social phenomena, prostitution is increasingly coordinated over the Internet. The online behavior affects the offline activity; the reverse is also true. We investigated the reported sexual contacts between 6,624 anonymous escorts and 10,106 sex-buyers extracted from an online community from its beginning and six years on. These sexual encounters were also graded and categorized (in terms of the type of sexual activities performed) by the buyers. From the temporal, bipartite network of posts, we found a full feedback loop in which high grades on previous posts affect the future commercial success of the sex-worker, and vice versa. We also found a peculiar growth pattern in which the turnover of community members and sex workers causes a sublinear preferential attachment. There is, moreover, a strong geographic influence on network structure-the network is geographically clustered but still close to connected, the contacts consistent with the inverse-square law observed in trading patterns. We also found that the number of sellers scales sublinearly with city size, so this type of prostitution does not, comparatively speaking, benefit much from an increasing concentration of people

A Landscape Cannot Be A Homeland

This is the author accepted manuscript. The final version is available from Taylor & Francis via the DOI in this record.What is the problem for which landscape is the answer? In this paper, I offer a response to this question, first posed at a meeting of landscape researchers in Brussels in 2011. I argue that the problem can be defined as ontopology, or what I call here homeland thinking, and I propose that a landscape cannot be a homeland. The salience of landscape as a critical term instead involves modes of thinking and feeling that chafe against invocations of homeland as a site of existential inhabitation, as a locus of sentiment and attachment, and a wellspring of identity. The paper explores the connections between ideas of landscape and homeland through discussions of the European Landscape Convention, phenomenology and the term homeland itself. I conclude by arguing that a landscape must be understood as a kind of dislocation or distancing from itself. There are, after all, no original inhabitants

Derivation of a tasselled cap transformation based on Landsat 7 at-satellite reflectance

A new tasselled cap transformation based on Landsat 7 at-satellite reflectance was developed. This transformation is most appropriate for regional applications where atmospheric correction is not feasible. The brightness, greenness and wetness of the derived transformation collectively explained over 97% of the spectral variance of the individual scenes used in this study

Plant extract efficacy on mosquito mortality: preliminary studies on the effect of Ailanthus altissima extract on adult Aedes aegypti and Culex quinquefasciatus

Abstract Due to the negative environmental impact and resistance to synthetic insecticides, the development of biological control has increased significantly over the past half century with the potential of plant extracts only recently attracting attention. The purpose of this preliminary study was to examine the potential of Ailanthus altissima extract as a botanical insecticide on adult mosquitoes. Two species of mosquitoes (Aedes aegypti and Culex quinquefasciatus) and a non-target lepidopteran species, Painted Lady butterfly (Vanessa cardui) were treated with A. altissima extract from new, mature, and senesced leaflets using serial dilutions (0, 25, 50, 75, 100%) of extract via two application methods (aerosol and sugar feeding). We found that application method and leaf age had significant effects on mosquito mortality at high concentrations. These findings indicate that while mortality was not significantly high compared to commercial products, there may be potential to use an invasive plant extract as a bio-control tool for mosquito vectors of human disease pathogens