902 research outputs found
The use of radio-iodinated toluidine blue for myocardial scintigrams,
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33788/1/0000043.pd
Instrumentation for open ocean aquaculture monitoring
The Woods Hole Oceanographic Institution is assisting the University of New Hampshire by instrumenting a fish cage and mooring as part of their Open Ocean Aquaculture demonstration program in the Gulf of Maine. To understand these systems, the wave and current forcing and the response of the mooring and fish cage needs to be measured. A UNH mooring with an ADCP measured the current forcing. Tension in the mooring lines was measured by load cells deployed with the mooring during servicing in August 2000. Load cells were placed in each anchor line, and, in the NE corner, also in the two grid lines and the riser line to the fish cage. Low power recording systems were deployed on the load cell mounting bars by divers on 22 October 2000, recorded good data through January 2001, when they were turned around and redeployed. Three single load cell recorders were recovered in July 2001 and recorded though 23 June when their data storage filled. The four load cell system was recovered in March after a large winter storm, and had failed in early March. The wave forcing was measured with a wave rider buoy with a 3-axis accelerometer measuring its motion. The acceleration was integrated twice to obtain wave displacement. The system mooring contained a compliant elastic. The wave rider was deployed on 4 January 2001 and recovered on 17 March 2001 after a major Northeast storm. It recorded data throughout its deployment. The motion of the moored fish cage was measured by a motion package constructed around a 6-axis Motion-Pak and a PC-104 data system. The motion package was deployed on the fish cage from Jan into March 2001 and recorded motions thoughout without difficuly. It observed a major storm in early March where the counter weight was lost from the fish cage, and its increase in motion thereafter.Fudning was provided by National Oceanic and Atmospheric Adminstration for the Open Ocean Aquaculture Project under Contract No. NA86RG0016 to the University of New Hampshire and under Subcontracts 00-394 and 01-442 to the Woods Hole Oceanographic Institution
Knee joint kinetics in response to multiple three-dimensional printed, customised foot orthoses for the treatment of medial compartment knee osteoarthritis
In silico protein interaction screening uncovers DONSON's role in vertebrate CMG helicase assembly
Highly-excited CO emission in APM08279+5255 at z=3.9
We report the detection of the CO 4-3, 6-5, 9-8, 10-9, and 11-10 lines in the
Broad Absorption Line quasar APM08279+5255 at z=3.9 using the IRAM 30m
telescope. We also present IRAM PdBI high spatial resolution observations of
the CO 4-3 and 9-8 lines, and of the 1.4mm dust radiation as well as an
improved spectrum of the HCN(5-4) line. Unlike CO in other QSO host galaxies,
the CO line SED of APM08279+5255 rises up to the CO(10-9) transition. The line
fluxes in the CO ladder and the dust continuum fluxes are best fit by a two
component model, a "cold" component at ~65K with a high density of n(H2)=
1x10^5 cm^-3, and a "warm", ~220K component with a density of 1x10^4 cm^-3. We
show that IR pumping via the 14 micron bending mode of HCN is the most likely
channel for the HCN excitation. From our models we find, that the CO(1-0)
emission is dominated by the {\it dense} gas component which implies that the
CO conversion factor is higher than usually assumed for high-z galaxies with
alpha~5 SM/(K km/s pc^2). Using brightness temperature arguments, the results
from our high-resolution mapping, and lens models from the literature, we argue
that the molecular lines and the dust continuum emission arise from a very
compact (r~100-300 pc), highly gravitationally magnified (m= 60-110) region
surrounding the central AGN. Part of the difference relative to other high-
QSOs may therefore be due to the configuration of the gravitational lens, which
gives us a high-magnification zoom right into the central 200-pc radius of
APM08279+5255 where IR pumping plays a significant role for the excitation of
the molecular lines.Comment: 18 pages, 14 figures, accepted for publication in A&
Identifications of Five INTEGRAL Sources via Optical Spectroscopy
The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) is discovering
hundreds of new hard X-ray sources, many of which remain unidentified. We
report on optical spectroscopy of five such sources for which X-ray
observations at lower energies (~0.5-10 keV) and higher angular resolutions
than INTEGRAL have allowed for unique optical counterparts to be located. We
find that IGR J16426+6536 and IGR J22292+6647 are Type 1 Seyfert active
galactic nuclei (with IGR J16426+6536 further classified as a Seyfert 1.5)
which have redshifts of z=0.323 and z=0.113, respectively. IGR J18308-1232 is
identified as a cataclysmic variable (CV), and we confirm a previous
identification of IGR J19267+1325 as a magnetic CV. IGR J18214-1318 is
identified as an obscured high mass X-ray binary (HMXB), which are systems
thought to have a compact object embedded in the stellar wind of a massive
star. We combine Chandra fluxes with distances based on the optical
observations to calculate X-ray luminosities of the HMXB and CVs, finding
L_(0.3-10 keV)=5e36 erg s^-1 for IGR J18214-1318, L_(0.3-10 keV)=1.3e32 erg
s^-1 for IGR J18308-1232, and L_(0.3-10 keV)=6.7e32 erg s^-1 for IGR
J19267+1325.Comment: 8 pages, 5 figures, accepted for publication by Ap
Blood pressure variability and microvascular dysfunction:the Maastricht Study
Background: Microvascular dysfunction (MVD) contributes to stroke, dementia, depression, retinopathy and chronic kidney disease. However, the determinants of MVD are incompletely understood. Greater blood pressure variability (BPV) may be one such determinant. Methods and results: We used cross-sectional data of The Maastricht Study (n = 2773, age 59.9 years; 51.9% men) to investigate whether greater very short- to mid-term BPV is associated with various MVD measures. We standardized and averaged within-visit, 24-h and 7-day BPV into a systolic and a diastolic BPV composite score. MVD measures included a composite score of MRI cerebral small vessel disease (CSVD) features (total brain parenchymal volume, white matter hyperintensity volume, lacunar infarcts and cerebral microbleeds), a composite score of flicker light-induced retinal arteriolar and venular dilation response, albuminuria, heat-induced skin hyperemia and a composite score of plasma biomarkers of MVD (sICAM-1, sVCAM-1, sE-selectin and von Willebrand Factor). We used linear regression adjusted for age, sex, glucose metabolism status, mean 24-h systolic or DBP, cardiovascular risk factors and antihypertensive medication. We found that higher systolic and diastolic BPV composite scores (per SD) were associated with higher albuminuria [higher ratio, 1.04 (95% CI 1.00â1.08) and 1.07 (1.03â1.11), respectively], but not with other measures of MVD tested. Conclusion: Greater systolic and diastolic BPV was associated with higher albuminuria, but not with CSVD features, flicker light-induced retinal arteriolar and venular dilation response, heat-induced skin hyperemia and plasma biomarkers of MVD. This suggests that the microvasculature of the kidneys is most vulnerable to the detrimental effects of greater BPV
On the selection of AGN neutrino source candidates for a source stacking analysis with neutrino telescopes
The sensitivity of a search for sources of TeV neutrinos can be improved by
grouping potential sources together into generic classes in a procedure that is
known as source stacking. In this paper, we define catalogs of Active Galactic
Nuclei (AGN) and use them to perform a source stacking analysis. The grouping
of AGN into classes is done in two steps: first, AGN classes are defined, then,
sources to be stacked are selected assuming that a potential neutrino flux is
linearly correlated with the photon luminosity in a certain energy band (radio,
IR, optical, keV, GeV, TeV). Lacking any secure detailed knowledge on neutrino
production in AGN, this correlation is motivated by hadronic AGN models, as
briefly reviewed in this paper.
The source stacking search for neutrinos from generic AGN classes is
illustrated using the data collected by the AMANDA-II high energy neutrino
detector during the year 2000. No significant excess for any of the suggested
groups was found.Comment: 43 pages, 12 figures, accepted by Astroparticle Physic
MYC activation cooperates with Vhl and Ink4a/Arf loss to induce clear cell renal cell carcinoma
Renal carcinoma is a common and aggressive malignancy whose histopathogenesis is incompletely understood and that is largely resistant to cytotoxic chemotherapy. We present two mouse models of kidney cancer that recapitulate the genomic alterations found in human papillary (pRCC) and clear cell RCC (ccRCC), the most common RCC subtypes. MYC activation results in highly penetrant pRCC tumours (MYC), while MYC activation, when combined with Vhl and Cdkn2a (Ink4a/Arf) deletion (VIM), produce kidney tumours that approximate human ccRCC. RNAseq of the mouse tumours demonstrate that MYC tumours resemble Type 2 pRCC, which are known to harbour MYC activation. Furthermore, VIM tumours more closely simulate human ccRCC. Based on their high penetrance, short latency, and histologic fidelity, these models of papillary and clear cell RCC should be significant contributions to the field of kidney cancer research
Kinematic Control of the Inertiality of ICRS Catalogs
We perform a kinematic analysis of the Hipparcos and TRC proper motions of
stars by using a linear Ogorodnikov-Milne model. All of the distant (r more
than 0.2 kpc) stars of the Hipparcos catalog have been found to rotate around
the Galactic y axis with an angular velocity of -0.36 +/- 0.09 mas/year. One of
the causes of this rotation may be an uncertainty in the lunisolar precession
constant adopted when constructing the ICRS. In this case? the correction to
the IAU (1976) lunisolar precession constant in longitude is shown to be -3.26
+/- 0.10 mas/yr. Based on the TRC catalog, we have determined the main Oort
constants: A = 14.9 +/- 1.0 and B = -10.8 +/- 0.3 km/s/kpc. The component of
the model that describes the rotation of all TRC stars around the Galactic y
axis is nonzero for all magnitudes, My= -0.86 +/- 0.11 mas/yr.Comment: 10 pages, 4 figures, 2 table
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