BIMA and Keck Imaging of the Radio Ring PKS 1830-211

We discuss BIMA (Berkeley Illinois Maryland Association) data and present new high quality optical and near-IR Keck images of the bright radio ring PKS 1830-211. Applying a powerful new deconvolution algorithm we have been able to identify both images of the radio source. In addition we recover an extended source in the optical, consistent with the expected location of the lensing galaxy. The source counterparts are very red, I-K=7, suggesting strong Galactic absorption with additional absorption by the lensing galaxy at z=0.885, and consistent with the detection of high redshift molecules in the lens.Comment: To be published in the ASP Conference Proceedings, 'Highly Redshifted Radio Lines', Greenbank, W

Bioresorbable Film for the Prevention of Adhesion to the Anterior Spine After Anterolateral Discectomy

Background context The development of scar tissue and adhesions postoperatively is a natural consequence of healing but can be associated with medical complications and render reoperation difficult. Many biocompatible products have been evaluated as barriers or deterrents to adhesions. Purpose To evaluate the efficacy of a bioresorbable polylactide film as a barrier to adhesion formation after anterolateral discectomy. Study design Experimental study. Methods Seven, skeletally mature female sheep underwent a retroperitoneal approach to the anterolateral lumbar spine. A discectomy was performed at two levels with an intervening unoperated disc site. One site was treated with a polylactide film barrier (Hydrosorb Shield; MacroPore Biosurgery, San Diego, CA) affixed with tacks manufactured from the same material. The second site was left untreated. Treatment and control sites were randomly assigned. Postmortem analysis included scar tenacity scoring on five spines and histological evaluation on two spines. Results The application of the Hydrosorb film barrier allowed a definite dissection plane during scar tenacity scoring and there was a significant difference in the development of adhesions to the disc between the control and treated sites. Histological evaluation revealed evidence of barrier formation to scar tissue and no significant adverse inflammatory reactions. Conclusions Hydrosorb Shield appears to be an effective postoperative barrier to scar tissue adhesion after anterolateral discectomy. The use of polylactide tacks was beneficial to affix the barrier film in place. Safety issues associated with delayed healing or adverse response to the film or tacks were not observed. Hydrosorb film may be useful as an antiadhesion barrier facilitating dissection during surgical revision in anterior approaches to the spine. Further studies are indicated to evaluate the performance of the bioresorbable material as an antiadhesion barrier in techniques of spinal fusion and disc replacement

Preventing Disability Among Working Participants in Kansas’ High-risk Insurance Pool: Implications for Health Reform

Health conditions that prevent individuals from working full time can restrict their access to health insurance. For people living in the 35 states that offer high-risk pools, coverage is available but premiums are 125–200% of standard rates. Additionally, high cost-sharing means enrollees often defer needed care because they must pay large amounts out of pocket. Lack of access may lead to poor health outcomes and disability. The Kansas DMIE investigated whether improving insurance coverage for such a group would improve their health status and reduce their risk of transition to full Social Security disability. Half of the 508 participants received enhanced benefits and nurse case management, the other half received usual risk pool coverage. Outcomes were measured through telephone surveys, focus groups, and claims analysis. Utilization of services increased and health status stabilized for the intervention group, while health status of the control group significantly declined. These findings have broad implications because some plans to be offered under the Patient Protection and Affordable Care Act of 2010 (P.L. 111–148) have similarly high out-of-pocket costs. Considering the long-term cost of full disability, providing adequate health insurance benefits for individuals at high risk of disability may be cost effective.Kansas Health Policy Authority, U.S. Department of Health and Human Services, Centers for Medicare and Medicaid Services (no. 11-P-92389/7-01)

Reference Standards for Body Fat Measure Using GE Dual Energy X-Ray Absorptiometry in Caucasian Adults

Background Dual energy x-ray absorptiometry (DXA) is an established technique for the measurement of body composition. Reference values for these variables, particularly those related to fat mass, are necessary for interpretation and accurate classification of those at risk for obesityrelated health complications and in need of lifestyle modifications (diet, physical activity, etc.). Currently, there are no reference values available for GE-Healthcare DXA systems and it is known that whole-body and regional fat mass measures differ by DXA manufacturer. Objective To develop reference values by age and sex for DXA-derived fat mass measurements with GE-Healthcare systems. Methods A de-identified sample of 3,327 participants (2,076 women, 1,251 men) was obtained from Ball State University\u27s Clinical Exercise Physiology Laboratory and University of Wisconsin- Milwaukee\u27s Physical Activity & Health Research Laboratory. All scans were completed using a GE Lunar Prodigy or iDXA and data reported included percent body fat (%BF), fat mass index (FMI), and ratios of android-to-gynoid (A/G), trunk/limb, and trunk/leg fat measurements. Percentiles were calculated and a factorial ANOVA was used to determine differences in the mean values for each variable between age and sex. Results Normative reference values for fat mass variables from DXA measurements obtained from GE-Healthcare DXA systems are presented as percentiles for both women and men in 10- year age groups. Women had higher (p\u3c0.01) mean %BF and FMI than men, whereas men had higher (p\u3c0.01) mean ratios of A/G, trunk/limb, and trunk/leg fat measurements than women

Optical Communication Link Atmospheric Attenuation Model

The Space Communications and Navigation (SCaN) Center for Networking, Integration, and Communications (SCENIC) user interface, which provides web accessible space mission simulation and communication system analysis capabilities using verified and validated analysis algorithms, can execute analyses including, but not limited to, line-of-sight, orbit propagation, and dynamic link budget calculations between sets of missions and/or assets. SCENIC's purpose is to provide NASA civil servants and contractors a user-friendly tool, integrated with model data, that can simulate and analyze a range of space mission architectures without the need for repeated and redundant modeling. Given the abundance and further future development of free space optical (FSO) communication channels within modern space infrastructure, the availability of a reliable optical link analysis capability is crucial for SCENIC users. The efforts outlined in this paper aim to provide a model for atmospheric attenuation of FSO communication links, both due to absorption/scattering and turbulence, to increase the accuracy of SCENIC's optical link assessment capabilities. A previous model existed for optical absorption/scattering within the SCaN Link Budget Tool, but it was not location specific for the Earth ground-based nodes, nor was the model optimized for run-time. The new model utilizes years of National Oceanic and Atmospheric Administration (NOAA) visibility data from ground station locations around the world. Visibility, along with the wavelength of the optical signal, are input parameters to calculate the optical specific attenuation, which is a parameter in the calculation of the slant-path attenuation. A final FSO atmospheric attenuation value is comprised of the absorption/scattering attenuation and the turbulence attenuation. A run-time efficient algorithm for the model was then developed and programmed in MATLAB. Due to the simple model and vectorization possible in MATLAB, the algorithm has an average run-time of less than one fourth of the run-time of the previous implementation

Discovery of Five New R Coronae Borealis Stars in the MACHO Galactic Bulge Database

We have identified five new R Coronae Borealis (RCB) stars in the Galactic bulge using the MACHO Project photometry database, raising the total number of known Galactic RCB stars to about 40. We have obtained spectra to confirm the identifications. The fact that four out of the five newly identified RCB stars are ``cool'' (T(eff) 6000 K) suggests that the preponderance of warm RCB stars among the existing sample is a selection bias. These cool RCB stars are redder and fainter than their warm counterparts and may have been missed in surveys done with blue plates. Based on the number of new RCB stars discovered in the MACHO bulge fields, there may be ~250 RCB stars in the reddened "exclusion" zone toward the bulge.Comment: 16 pages, 5 figures, AJ in press High resolution versions of Figures 1 and 2 can be downloaded from http://morpheus.phys.lsu.edu/~gclayton/figs.pdf (more typos corrected

Second harmonic light scattering induced by defects in the twist-bend nematic phase of liquid crystal dimers

The nematic twist-bend (NTB) phase, exhibited by certain thermotropic liquid crystalline (LC) dimers, represents a new orientationally ordered mesophase -- the first distinct nematic variant discovered in many years. The NTB phase is distinguished by a heliconical winding of the average molecular long axis (director) with a remarkably short (nanoscale) pitch and, in systems of achiral dimers, with an equal probability to form right- and left-handed domains. The NTB structure thus provides another fascinating example of spontaneous chiral symmetry breaking in nature. The order parameter driving the formation of the heliconical state has been theoretically conjectured to be a polarization field, deriving from the bent conformation of the dimers, that rotates helically with the same nanoscale pitch as the director field. It therefore presents a significant challenge for experimental detection. Here we report a second harmonic light scattering (SHLS) study on two achiral, NTB-forming LCs, which is sensitive to the polarization field due to micron-scale distortion of the helical structure associated with naturally-occurring textural defects. These defects are parabolic focal conics of smectic-like ``pseudo-layers", defined by planes of equivalent phase in a coarse-grained description of the NTB state. Our SHLS data are explained by a coarse-grained free energy density that combines a Landau-deGennes expansion of the polarization field, the elastic energy of a nematic, and a linear coupling between the two

THE ROLE OF AEOLIAN DUST IN NUTRIENT AND SOLUTE TRANSPORT IN THE MCMURDO DRY VALLEYS, ANTARCTICA

The McMurdo Dry Valleys (MDV), the largest ice-free expanse in Antarctica, are considered a polar desert with an average annual temperature of -20oC and annual precipitation of \u3c10cm. Despite the extremely arid climate, a hydrologic continuum exists during the austral summer when ephemeral streams formed from glacial meltwater flow into endorheic lakes. Dust is deposited by strong seasonal winds onto the glacier and lake surfaces, as well as in widespread aeolian landforms throughout the MDV. Katabatic winds from the west, probably responsible for the majority of lithogenic dust deposition, dominate during the winter months. Easterly winds from the coast, prominent during the summer, contribute to the dust budget through the addition of salts and marine aerosols. When considered in the context of the unique hydrologic continuum and the climate-sensitivity of the environment, the dissolution of deposited dust may have an impact on salt and nutrient transfer and thus the ecosystem of the MDV. We have simulated this dissolution by conducting a two-step H2O leaching experiment on aeolian sediments collected from select glaciers, lakes, aeolian landforms, and elevated sediment traps. Resulting leachates representing the interaction of 50mL H2O with 25 g of dust sample were analyzed for major ions. NO3- concentrations (leach 1: \u3c1.0-240 µM; leach 2: \u3c1.0-94 µM) generally increase to the west and imply that aeolian deposition is potentially important to the nitrogen cycle in the MDV. Total dissolved solid concentrations (leach 1: 9-544 mg/L; leach 2: 6-150 mg/L), however, do not show any geographic/spatial correlation which is not consistent with previous work and suggests the significance of dust dissolution to the environment. Aliquots of the total dust were also analyzed for total C and N values. All but two samples, Lake Fryxell (0.12% N) and the eastern side of the Commonwealth Glacier (0.09% N), were below detection limit with respect to N (\u3c0.08% N). Both samples are from the Fryxell basin, the youngest of the basins, that is nitrogen limited. C values ranged from below detection (\u3c0.04% C) to 1.27% C. These results attest to the importance of dust as an addition to the ecosystem of the MDV. Further investigation of the dust is planned to constrain its chemical and mineralogical composition