145 research outputs found
Living in Two Worlds: Rural Maine in 1930
This article discusses the situation in the State of Maine in the early 1930. Highlighted are the quickening pace and modernization that came into the agrarian society and the challenge to residents of fast transportation and forced specialized farm production
Nearing the End: Maineâs Rural Community, 1929-1945
The article discusses the impact of the Great Depression on the rural communities of Maine. It also reviews the local, state and federal responses in those areas
Bayonets at the North Bridge: The Lewiston-Auburn Shoe Strike, 1937
The article discusses the strike of shoe manufacturing employees in Lewiston-Auburn in 1937 and why it failed. It includes an analysis of the situation that confronted the strike leaders with a discussion of their strategies and those of their opponents
Book Reviews
Reviews of the following books: Hardliners: A History of the Emery-Waterhouse Company by Edgar Allen Beem and Charles L. Hildreth, Jr.; L.L. Bean: The Making of an American Icon by Leon Gorman; Eminent Mainers: Succinct Biographies of Thousands of Amazing Mainers, Mostly Dead and a Few People from Away Who Have Done Something Useful Within the State Maine; Compiled by Arthur Douglas Stover and Maine: Downeast and Different: An Illustrated History by Neil Rolde; ; The Rangeley and Its Region: The Famous Boat and Lakes of Western Maine by Stephen A. Cole; Voyages: A Maine Franco-American Reader, edited by Nelson Madore and Barry Rodrigu
Geology and geochronology of the Tana Basin, Ethiopia : LIP volcanism, super eruptions and Eocene-Oligocene environmental change
This work was supported by NERC Grants NE/D012996/1 and NER/B/S/2002/00540 and NIGFSC IP/1024/0508.New geological and geochronological data define four episodes of volcanism for the Lake Tana region in the northern Ethiopian portion of the AfroâArabian Large Igneous Province (LIP): pre-31 Ma flood basalt that yielded a single 40Ar/39Ar age of 34.05 ± 0.54/0.56 Ma; thick and extensive felsic ignimbrites and rhyolites (minimum volume of 2-3 x 103km3) erupted between 31.108 ± 0.020/0.041 Ma and 30.844 ± 0.027/0.046 Ma (UâPb CA-ID-TIMS zircon ages); mafic volcanism bracketed by 40Ar/39Ar ages of 28.90 ± 0.12/0.14 Ma and 23.75 ± 0.02/0.04 Ma; and localised scoraceous basalt with an 40Ar/39Ar age of 0.033 ± 0.005/0.005 Ma. The felsic volcanism was the product of super eruptions that created a 60â80 km diameter caldera marked by km-scale caldera-collapse fault blocks and a steep-sided basin filled with a minimum of 180 m of sediment and the present-day Lake Tana. These new data enable mapping, with a finer resolution than previously possible, AfroâArabian LIP volcanism onto the timeline of the EoceneâOligocene transition and show that neither the mafic nor silicic volcanism coincides directly with perturbations in the geochemical records that span that transition. Our results reinforce the view that it is not the development of a LIP alone but its rate of effusion that contributes to inducing global-scale environmental change.PostprintPeer reviewe
Impairment of Methotrexate Transport Is Common in Osteosarcoma Tumor Samples
Osteosarcoma does not respond well to conventional dose methotrexate but does respond to high-dose methotrexate. Previous work has indicated that this resistance may be due to impaired transport of methotrexate across the cell membrane. In this study, the PT430 competitive displacement assay was adapted to evaluate methotrexate transport in 69 high-grade osteosarcoma tumor samples. All samples studied were shown to have relatively impaired methotrexate transport by PT430 assay. Ninety-nine percent of the samples had less than 20% PT430 displacement by methotrexate. Eighty-eight percent exhibited displacement by methotrexate at less than 50% of the displacement by trimetrexate. The high frequency of impaired transport suggests the presence of decreased functionality of the reduced folate carrier protein. The overwhelming presence of impaired transport may explain why methotrexate needs to be given in high doses to be effective in osteosarcoma therapy and suggests that reduced folate carrier-independent antifolates should be explored
Variable Radio Sources in the Galactic Plane
Using three epochs of VLA observations of the Galactic Plane in the first
quadrant taken ~15 years apart, we have conducted a search for a population of
variable Galactic radio emitters in the flux density range 1-100 mJy at 6 cm.
We find 39 variable sources in a total survey area of 23.2 sq deg. Correcting
for various selection effects and for the extragalactic variable population of
active galactic nuclei, we conclude there are ~1.6 Galactic sources per sq deg
which vary by more than 50% on a time scale of years (or shorter). We show that
these sources are much more highly variable than extragalactic objects; more
than 50% show variability by a factor >2 compared to <10% for extragalactic
objects in the same flux density range. We also show that the fraction of
variable sources increases toward the Galactic center (another indication that
this is a Galactic population), and that the spectral indices of many of these
sources are flat or inverted. A small number of the variables are coincident
with mid-IR sources and two are coincident with X-ray emitters, but most have
no known counterparts at other wavelengths. Intriguingly, one lies at the
center of a supernova remnant, while another appears to be a very compact
planetary nebula; several are likely to represent activity associated with star
formation regions. We discuss the possible source classes which could
contribute to the variable cohort and followup observations which could clarify
the nature of these sources.Comment: 11 pages, 7 figures; to be published in the Astronomical Journal;
data available on MAGPIS website at http://third.ucllnl.org/gps
Variable and Transient Radio Sources in the FIRST Survey
A comprehensive search for variable and transient radio sources has been
conducted using ~55,000 snapshot images of the FIRST survey. We present an
analysis leading to the discovery of 1,627 variable and transient objects down
to mJy levels over a wide range of timescales (few minutes to years).
Variations observed range from 20% to a factor of 25. Multi-wavelength matching
for counterparts reveals the diverse classes of objects exhibiting variability,
ranging from nearby stars and pulsars to galaxies and distant quasars.
Interestingly, more than half of the objects in the sample have either no
classified counterparts or no corresponding sources at any other wavelength and
require multi-wavelength follow-up observations. We discuss these classes of
variables and speculate on the identity of objects that lack multi-wavelength
counterparts.Comment: 63 pages, 18 encapsulated postscript figures (19 if individual
subfigures are counted), 3 tables. LaTeX style file fltpage.sty used.
Submitted, accepted and "in press" for publication in the Astrophysical
Journal. Full electronic version of table 1 (tab1.txt) has been uploaded and
can be obtained after extracting the zipped source fil
VIMOS-IFU survey of z~0.2 massive galaxy clusters. I. Observations of the strong lensing cluster Abell 2667
(abridged) We present extensive multi-color imaging and low resolution VIMOS
Integral Field Unit spectroscopic observations of the X-ray luminous cluster
Abell 2667 (z=0.233). An extremely bright giant gravitational arc (z=1.0334) is
easily identified as part of a triple image system and other fainter multiple
images are also revealed by the HST-WFPC2 images. The VIMOS-IFU observations
cover a field of view of 54'' x 54'' and enable us to determine the redshift of
all galaxies down to V=22.5. Furthermore, redshifts could be identified for
some sources down to V=23.2. In particular we identify 21 cluster members in
the cluster inner region, from which we derive a velocity dispersion of
\sigma=960 km/s, corresponding to a total mass of 7.1 x 10^{13} solar masses
within a 110 kpc radius. Using the multiple images constraints and priors on
the mass distribution of cluster galaxy halos we construct a detailed lensing
mass model leading to a total mass of 2.9 x 10^{13} solar masses within the
Einstein radius (16 arcsec). The lensing mass and dynamical mass are in good
agreement although the dynamical one is much less accurate. Comparing these
measurements with published X-ray analysis, is however less conclusive.
Although the X-ray temperature matches the dynamical and lensing estimates, the
published NFW mass model derived from the X-ray measurement with its small
concentration of c ~3 can not account for the large Einstein radius observed in
this cluster. A larger concentration of ~6 would however match the strong
lensing measurements. These results are likely reflecting the complex structure
of the cluster mass distribution, underlying the importance of panchromatic
studies from small to large scale in order to better understand cluster
physics.Comment: 14 pages, 12 figures. Submitted to A
Galaxies in Southern Bright Star Fields I. Near-infrared imaging
As a prerequisite for cosmological studies using adaptive optics techniques,
we have begun to identify and characterize faint sources in the vicinity of
bright stars at high Galactic latitudes. The initial phase of this work has
been a program of K_s imaging conducted with SOFI at the ESO NTT. From
observations of 42 southern fields evenly divided between the spring and autumn
skies, we have identified 391 additional stars and 1589 galaxies lying at
separations 60" from candidate guide stars in the magnitude range 9.0 R 12.4.
When analyzed as a "discrete deep field" with 131 arcmin^2 area, our dataset
gives galaxy number counts that agree with those derived previously over the
range 16 K_s 20.5. This consistency indicates that in the aggregate, our fields
should be suitable for future statistical studies. We provide our source
catalogue as a resource for users of large telescopes in the southern
hemisphere.Comment: 10 pages, 7 figures, accepted by A&A; Table 3 is available at
http://www.rzg.mpg.de/~ajb/data.html pending upload to CD
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