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1

Simulations of Solar AO Systems  

NASA Astrophysics Data System (ADS)

In this paper, first we compare the two kinds of algorithms that are being used in solar AO systems to sense a distorted wave-front through simulations. Then, we comment on the various issues related to solar AO systems and describe solar features that can be studied using AO as a tool. Then we briefly describe the laboratory model of AO that is being built at the Udaipur Solar Observatory (USO), India.

Sridharan, R.; Bayanna, A. Raja; Venkatakrishnan, P.

2

The JMB Electronics AO Syllabus.  

ERIC Educational Resources Information Center

Provides background information on and a brief description of the content and aims of the AO syllabus in electronics. The syllabus is divided into six sections: (1) measurement/instruments; (2) materials, devices, and transducers; (3) digital electronics; (4) analog electronics; (5) electronic systems; and (6) electronics impact on…

Gough, C. E.

1983-01-01

3

The Magellan Telescope adaptive secondary AO system  

NASA Astrophysics Data System (ADS)

The Magellan Clay telescope is a 6.5m Gregorian telescope located in southern Chile at Las Campanas Observatory. The Gregorian design allows for an adaptive secondary mirror that can be tested off-sky in a straight-forward manner. We have fabricated a 85 cm diameter aspheric adaptive secondary with our subcontractors and partners. This secondary has 585 actuators with <1 msec response times. The chopping adaptive secondary will allow low emissivity AO science. We will achieve very high Strehls (~98%) in the Mid-IR AO (8-26 microns) with the BLINC/MIRAC4 Mid-IR science camera. This will allow the first "super-resolution" and nulling Mid-IR studies of dusty southern objects. We will employ a high order (585 mode) pyramid wavefront sensor similar to that used in the Large Binocular Telescope AO systems. The relatively high actuator count will allow modest Strehls to be obtained in the visible (~0.8?m). Our visible light AO (Vis AO) science camera is fed by an advanced ADC and beamsplitter piggy-backed on the WFS optical table. The system science and performance requirements, and an overview the design, interface and schedule for the Magellan AO system are presented here.

Close, Laird M.; Gasho, Victor; Kopon, Derek; Hinz, Phil M.; Hoffmann, William F.; Uomoto, Alan; Hare, Tyson

2008-07-01

4

Quantitative solar system science with AO systems  

NASA Astrophysics Data System (ADS)

Adaptive Optics systems, today available on 8-10m class telescopes are playing a significant role in the study of our solar system bodies. We describe three main science cases i) small solar system bodies ii) satellites of giant planets iii) giant planets atmospheres. We describe recent results acquired with these systems in these fields. We discuss the limitation and potential of AO systems for these studies, and address the problem of observability specific to moving targets. The potential for planetary science of future and improved AO systems is described.

Marchis, Franck; Berthier, Jerome; Wong, Michael H.

2012-07-01

5

AATA AOS Evaluation. Transfer and On-Time Performance Study: Before and After AOS Implementation.  

National Technical Information Service (NTIS)

This study develops, using data before AOS in 1996 and 1997 and after AOS in 1998 and 1999, implementation data on AATAs on-time performance and vehicle-to-vehicle timing of transfers at four major transfer location. Systematic evaluation of on-time perfo...

1999-01-01

6

Upgrading the Keck AO wavefront controllers  

Microsoft Academic Search

This paper describes the recent upgrade performed on the W. M. Keck Observatory Adaptive Optics (AO) systems, in which the wavefront sensors and wavefront controllers were replaced with components based on new technology. The performance of the upgraded system has yielded an increase in limiting guide star magnitude, an increased Strehl ratio for both Laser Guide Star (LGS) and Natural

Erik M. Johansson; Marcos A. van Dam; Paul J. Stomski; James M. Bell; Jason C. Chin; Roger C. Sumner; Peter L. Wizinowich; Roberto Biasi; Mario Andrighettoni; Dietrich Pescoller

2008-01-01

7

Upgrading the Keck AO wavefront controllers  

Microsoft Academic Search

This paper describes the recent upgrade performed on the W. M. Keck Observatory Adaptive Optics (AO) systems, in which the wavefront sensors and wavefront controllers were replaced with components based on new technology. The performance of the upgraded system has yielded an increase in limiting guide star magnitude, an increased Strehl ratio for both Laser Guide Star (LGS) and Natural

Erik M. Johansson; Marcos A. van Dam; Paul J. Stomski; James M. Bell

8

Characterization of an AO-OCT system  

SciTech Connect

Adaptive optics (AO) and optical coherence tomography (OCT) are powerful imaging modalities that, when combined, can provide high-volumetric-resolution, images of the retina. The AO-OCT system at UC Davis has been under development for 2 years and has demonstrated the utility of this technology for microscopic, volumetric, in vivo retinal imaging [1]. The current system uses an AOptix bimorph deformable mirror (DM) for low-order, high-stroke correction [2] and a 140-actuator Boston Micromachines DM for high-order correction [3]. We are beginning to investigate the potential for increasing the image contrast in this system using higher-order wavefront correction. The first step in this analysis is to quantify the residual wavefront error (WFE) in the current system. Developing an error budget is a common tool for improved performance and system design in astronomical AO systems [4, 5]. The process for vision science systems is also discussed in several texts e.g. [6], but results from this type of analysis have rarely been included in journal articles on AO for vision science. Careful characterization of the AO system will lead to improved performance and inform the design of a future high-contrast system. In general, an AO system error budget must include an analysis of three categories of residual WFE: errors in measuring the phase, errors caused by limitations of the DM(s), and errors introduced by temporal variation. Understanding the mechanisms and relative size of these errors is critical to improving system performance. In this paper we discuss the techniques for characterizing these error sources in the AO-OCT system. It is useful to first calculate an error budget for the simpler case using a model eye, and then add the additional errors introduced for the case of a human subject. Measurement error includes calibration error, wavefront sensor (WFS) CCD noise, and sampling errors. Calibration errors must be measured by an external system. Typically this error is inferred from measurements of the point spread function (PSF). It can also be estimated by measuring known wavefront errors and comparing to the WFS measurement. Both methods will be used in the AO-OCT system. In this particular system measurement error introduced by the WFS can be caused by low light levels, poor camera sensitivity at the operating wavelength and noise introduced by heat in the uncooled CCD. Also, the gaussian beam profile of the system causes centroids near the edges of the pupil to be dimmer, and thus noisier. The easiest way to estimate measurement error is to compare successive wavefront measurements when the system is stable. This techniques will include vibrations and other systematic errors. Alternatively the measurement error can be estimated from measured signal to noise. This is more complicated but will decouple measurement errors from stability measurements. Ultimately, even if the phase is measured perfectly, performance will still be limited by the fitting error [7]. This error is inversely proportional to the number of actuators of the DM. Basically wavefront errors with spatial frequencies greater than half the number of actuators across the aperture cannot be corrected. For DMs with modal influence functions (like the AOptix Bimorph in the AO-OCT system), this translates to the number of modes which can be corrected. The AO-OCT system over-samples the wavefront, so to some extent, we can measure these out-of-band errors directly. In addition to fitting error, the DM will introduce errors based on the ability of each individual actuator to go to the position demanded by the control system. Generally this voltage step size is limited by the resolution of the drive electronics and can be calculated analytically.

Evans, J W; Zawadzki, R J; Jones, S; Olivier, S; Werner, J S

2007-07-26

9

The Subaru Coronagraphic Extreme AO Project  

NASA Astrophysics Data System (ADS)

While the existence of large numbers of extrasolar planets around solar type stars has been unambiguously demonstrated by radial velocity, transit and microlensing surveys, attempts at direct imaging with AO-equipped large telescopes remain unsuccessful. Because they supposedly offer more favorable contrast ratios, young systems consitute prime targets for imaging. Such observations will provide key insights on the formation and early evolution of planets and disks. Current surveys are limited by modest AO performance which limits inner working angle to 0.2", and only reach maximum sensitivity outside 1". This translates into orbital distances greater than 10 AU even on most nearby systems, while only 5 % of the known exoplanets have a semimajor axis greater than 10 AU. This calls for a major change of approach in the techniques used for direct imaging of the direct vicinity of stars. A sensible way to do the job is to combine coronagraphy and Extreme AO. Only accurate and fast control of the wavefront will permit the detection of high contrast planetary companions within 10 AU. The SCExAO system, currently under assembly, is an upgrade of the HiCIAO coronagraphic differential imaging camera, mounted behind the 188-actuator curvature AO system on Subaru Telescope. This platform includes a 1000-actuator MEMS deformable mirror for high accuracy wavefront correction and a PIAA coronagraph which delivers high contrast at 0.05" from the star (5 AU at 100 pc). Key technologies have been validated in the laboratory: high performance wavefront sensing schemes, spider vanes and central obstruction removal, and lossless beam apodization. The project is designed to be highly flexible to continuously integrate new technologies with high scientific payoff. Planned upgrades include an integral field unit for spectral characterization of planets/disks and a non-redundant aperture mask to push the performance of the system toward separations less than lambda/D.

Martinache, Frantz; Guyon, O.; Lozi, J.; Tamura, M.; Hodapp, K.; Suzuki, R.; Hayano, Y.; McElwain, M. W.

2009-01-01

10

AO operations at the W. M. Keck Observatory  

Microsoft Academic Search

Natural Guide Star (NGS) and Laser Guide Star (LGS) Adaptive Optics (AO) have been offered for routine science operations to the W. M. Keck Observatory community since 2000 and late 2004, respectively. The AO operations team is now supporting ~100 nights of AO observing with four different instruments, including over fifty nights of LGS AO per semester. In this paper

Randall D. Campbell; David Le Mignant; Marcos A. van Dam; Al Conrad; Kenny Grace; Marc Kassis; James E. Lyke; Hien Tran; Jason C. Y. Chin; Elizabeth Chock; Steven Doyle; Robert W. Goodrich; Erik M. Johansson; Tomas Krasuski; Christine Melcher; Douglas M. Summers; Roger C. Sumner; Peter L. Wizinowich

2008-01-01

11

AO wavefront sensing detector developments at ESO  

NASA Astrophysics Data System (ADS)

The detector is a critical component of any Adaptive Optics WaveFront Sensing (AO WFS) system. The required combination of fast frame rate, high quantum efficiency, low noise, large number and size of pixels, and low image lag can often only be met by specialized custom developments. ESO's very active WFS detector development program is described. Key test results are presented for newly developed detectors: a) the e2v L3Vision CCD220 (the fastest/lowest noise AO detector to date) to be deployed soon on 2nd Generation VLT instruments, and b) the MPI-HLL pnCCD with its superb high "red" response. The development of still more advanced laser/natural guide-star WFS detectors is critical for the feasibility of ESO's EELT. The paper outlines: a) the multi-phased development plan that will ensure detectors are available on-time for EELT first-light AO systems, b) results of design studies performed by industry during 2007 including a comparison of the most promising technologies, c) results from CMOS technology demonstrators that were built and tested over the past two years to assess and validate various technologies at the pixel level, their fulfillment of critical requirements (especially read noise and speed), and scalability to full-size. The next step will be towards Scaled-Down Demonstrators (SDD) to retire architecture and process risks. The SDD will be large enough to be used for E-ELT first-light AO WFS systems. For full operability, 30-50 full-scale devices will be needed.

Downing, Mark; Kolb, Johann; Baade, Dietrich; Iwert, Olaf; Hubin, Norbert; Reyes, Javier; Feautrier, Philippe; Gach, Jean-Luc; Balard, Philippe; Guillaume, Christian; Stadler, Eric; Magnard, Yves

2010-07-01

12

The Magellan Telescope Adaptive Secondary AO System: a visible and mid-IR AO facility  

NASA Astrophysics Data System (ADS)

The Magellan Clay telescope is a 6.5m Gregorian telescope located in Chile at Las Campanas Observatory. The Gregorian design allows for an adaptive secondary mirror that can be tested off-sky in a straightforward manner. We have fabricated a 85 cm diameter aspheric adaptive secondary with our subcontractors and partners, the ASM passed acceptance tests in July 2010. This secondary has 585 actuators with <1 msec response times (0.7 ms typically). This adaptive secondary will allow low emissivity AO science. We will achieve very high Strehls (~98%) in the Mid-IR (3-26 microns) with the BLINC/MIRAC4 Mid-IR science camera. This will allow the first "super-resolution" and nulling Mid-IR studies of dusty southern objects. We will employ a high order (585 mode) pyramid wavefront sensor similar to that now successfully used at the Large Binocular Telescope. The relatively high actuator count will allow modest Strehls to be obtained in the visible (0.63-1.05 ?m). Moderate (~20%) Strehls have already been obtained at 0.8 ?m at the LBT with the same powerful combination of a next generation ASM and Pyramid WFS as we are providing for Magellan. Our visible light AO (VisAO) science camera is fed by an advanced triplet ADC and is piggy-backed on the WFS optical board. We have designed an additional "clean-up" very fast (2 kHz) tilt stabilization system for VisAO. Also a high-speed shutter will be used to block periods of poor correction. The VisAO facility can be reconfigured to feed an optical IFU spectrograph with 20 mas spaxels. The entire system passed CDR in June 2009, and is now finished the fabrication phase and is entering the integration phase. The system science and performance requirements, and an overview the design, interface and schedule for the Magellan AO system are presented here.

Close, Laird M.; Gasho, Victor; Kopon, Derek; Males, Jared; Follette, Katherine B.; Brutlag, Kevin; Uomoto, Alan; Hare, Tyson

2010-07-01

13

Cold Friends of Hot Jupiters: AO Survey  

NASA Astrophysics Data System (ADS)

“Hot Jupiters” are a class of gas giant planets found in extrasolar systems at very small orbital distances (?0.05 AU). We know that these planets could not have formed at their present locations, but must instead have migrated in from beyond the ice line. One class of proposed migration mechanisms for these planets involve gravitational perturbations from a distant stellar companion. These same processes also provide a natural explanation for the existence of a subset of hot Jupiters that have been observed to have orbits that are highly misaligned with respect to their star's spin axis and/or have large orbital eccentricities. In the "Cold Friends" survey, we search for stellar companions around 51 stars known to host hot Jupiters in order to determine whether stellar companions play an important role in hot Jupiter migration. Our survey consists of a population of stars with planets that have eccentric and/or misaligned orbits as well as a control population of planets with well-aligned and circular orbits. This project searches for companion stars (the "Cold Friends") in three detection modes: radial velocity monitoring, high resolution IR spectroscopy (presented by D. Piskorz et al. at this meeting), and adaptive optics (AO) imaging at infrared wavelengths (presented here). The AO mode is sensitive to the most distant companions (separations of 50-200 AU and beyond) while the other modes are effective at finding companions at smaller separations. We present the results of our AO survey and discuss the binary fraction found in our sample. Out of our total sample of 51 stars, 19 candidate companions (many of which have not been observed before) were directly imaged around 17 stars. We also describe follow-up photometry and astrometry of all detected companions to determine whether or not they are gravitationally bound to the primary planet-hosting star. If such companions are common, it would suggest that perturbations from stellar companions may play a significant role in the evolution of hot Jupiter systems.

Ngo, Henry; Knutson, H. A.; Hinkley, S.; Crepp, J. R.; Batygin, K.; Howard, A. W.; Johnson, J. A.; Morton, T. D.; Muirhead, P. S.

2013-10-01

14

Low-order AO system in LAMOST  

NASA Astrophysics Data System (ADS)

The large sky area multi-object fiber spectroscopic telescope (LAMOST) is a special reflecting Schmidt telescope with its main optical axis on the meridian plane tilted by an angle of 25° to the horizontal. The clear aperture is 4m, working in optical band. The light path is 60m long when working in observing mode and it will be doubled if work in auto-collimation mode. So the image quality is affected clearly by the ground seeing and the dome seeing. In order to improve the seeing condition of the long light path, we enclosed the spherical primary and the focus unit in a tunnel enclosure and cooled the tunnel. This is an effective but passive method. Corresponding experiments and simulations show the main part of the aberrations caused by the ground seeing and dome seeing is slowly changed low order items such as tip-tilt, defocus, astigmatism, coma and spherical aberration. Thus we plan to develop the low-order AO system based on the low-cost 37-channel OKO deformable mirror for the telescope to better the ground seeing and the dome seeing, not aimed to reach diffraction limited image. This work is being carried on now.

Yuan, Xiangyan; Cui, Xiangqun; Liu, Genrong; Zhang, Yong; Qi, Yongjun

2006-07-01

15

Electromagnetic DM technology meets future AO demands  

NASA Astrophysics Data System (ADS)

New deformable mirror technology is developed by the Technische Universiteit Eindhoven, Delft University of Technology and TNO Science and Industry. Several prototype adaptive deformable mirrors are realized mirrors, up to 427 actuators and ?150mm diameter, with characteristics suitable for future AO systems. The prototypes consist of a 100µm thick, continuous facesheet on which low voltage, electromagnetic, push-pull actuators impose out-of-plane displacements. The variable reluctance actuators with ±10µm stroke and nanometer resolution are located in a standard actuator module. Each module with 61 actuators connects to a single PCB with dedicated, 16 bit, PWM based, drivers. A LVDS multi-drop cable connects up to 32 actuator modules. With the actuator module, accompanying PCB and multi-drop system the deformable mirror technology is made modular in its mechanics and electronics. An Ethernet-LVDS bridge enables any commercial PC to control the mirror using the UDP standard. Latest results of the deformable mirror technology development are presented.

Hamelinck, Roger; Rosielle, Nick; Steinbuch, Maarten; Doelman, Niek

16

NFIRAOS Multiconjugate AO System for TMT  

NASA Astrophysics Data System (ADS)

NFIRAOS, the Adaptive Optics system for the Thirty Meter Telescope, is a Multiconjugate Adaptive Optics System of order 60x60 with two deformable mirrors and six laser guide star wavefront sensors. NFIRAOS is 8 x 10 x 5 m (L x W x H) on a Nasmyth Platform and supports three client instruments operating over 0.8 - 2.5 ?m wavelength range. In this paper we discuss: NFIRAOS' requirements and architecture; changes to NFIRAOS since the last AO4ELT conference; interior details of NFIRAOS; interfaces to instruments; integration and verification plans. Top-level science requirements include 50% sky coverage at the galactic pole with <187 nm wavefront error. Astrometry is an important science driver - to minimize image distortion, we have recently revised the optical design to use four off-axis paraboloidal mirrors. We have vastly simplified the laser WFS zoom optics and moved them inside the cold enclosure. To control image magnification, differential magnification and tip/tilt/focus, NFIRAOS' client instruments have three low-order warfront sensors monitoring near-infrared natural guide stars. These stars are sharpened by NFIRAOS, which assists sky coverage. NFIRAOS will have high throughput and low thermal background - it will be cooled to -30 °C. The insulated walls have a buried cold plate to intercept heat leakage and isothermalize the interior of NFIRAOS. Instruments have stringent requirements on heat leakage and must provide their own rotator and interface to NFIRAOS, including a rotating seal. For wavelength and flat field calibration of client instruments, a NFIRAOS Science Calibration Unit (NSCU) feeds light in the entrance window, through NFIRAOS, to instruments. Inside NFIRAOS are deployable light sources simulating natural and laser guide stars, a focal plane mask with pinholes illuminated by the NSCU, as well as a turbulence phase screen. A prototype screen has been manufactured by magneto-rheological machining. We are currently updating the NFIRAOS preliminary design.

Herriot, Glen; Andersen, David; Atwood, Jenny; Byrnes, Peter; Boyer, Corinne; Caputa, Kris; Correia, Carlos; Dunn, Jennifer; Ellerbroek, Brent; Fitzsimmons, Joeleff; Gilles, Luc; Hickson, Paul; Hill, Alexis; Pazder, John; Reshetov, Vlad; Smith, Malcolm; Véran, Jean-Pierre; Wang, Lianqi; Wevers, Ivan

2011-09-01

17

Robo-AO: Performance and Characterization at Palomar Observatory  

NASA Astrophysics Data System (ADS)

Hosted at the Palomar 60-inch telescope, Robo-AO is the world's first completely autonomous, laser-beacon supported adaptive optics (AO) system, delivering diffraction-limited images in the visible and IR wavelengths. With simultaneous turbulence monitoring using a MASS-DIMM instrument, we have characterized the performance of Robo-AO as a function of local seeing, turbulence profile, laser return power and the brightness of the tip-tilt star. We shall present the various AO metrics: The full-width at half maxima of the point spread function, the Strehl ratio, the isoplanatic angle and their variations with the atmospheric and operating conditions. Strategies for optimizing robotic AO observations based on varying conditions will be discussed.

Tendulkar, Shriharsh P.; Baranec, C.; Riddle, R. L.; Ramaprakash, A. N.; Law, N. M.; Kulkarni, S. R.; Dekany, R.; Bui, K.; Davis, J.; Burse, M.; Das, H.; Punnadi, S.; Chordia, P.

2013-01-01

18

First closed-loop visible AO test results for the advanced adaptive secondary AO system for the Magellan Telescope: MagAO's performance and status  

NASA Astrophysics Data System (ADS)

The heart of the 6.5 Magellan AO system (MagAO) is a 585 actuator adaptive secondary mirror (ASM) with <1 msec response times (0.7 ms typically). This adaptive secondary will allow low emissivity and high-contrast AO science. We fabricated a high order (561 mode) pyramid wavefront sensor (similar to that now successfully used at the Large Binocular Telescope). The relatively high actuator count (and small projected ~23 cm pitch) allows moderate Strehls to be obtained by MagAO in the “visible” (0.63-1.05 ?m). To take advantage of this we have fabricated an AO CCD science camera called "VisAO". Complete “end-to-end” closed-loop lab tests of MagAO achieve a solid, broad-band, 37% Strehl (122 nm rms) at 0.76 ?m (i’) with the VisAO camera in 0.8” simulated seeing (13 cm ro at V) with fast 33 mph winds and a 40 m Lo locked on R=8 mag artificial star. These relatively high visible wavelength Strehls are enabled by our powerful combination of a next generation ASM and a Pyramid WFS with 400 controlled modes and 1000 Hz sample speeds (similar to that used successfully on-sky at the LBT). Currently only the VisAO science camera is used for lab testing of MagAO, but this high level of measured performance (122 nm rms) promises even higher Strehls with our IR science cameras. On bright (R=8 mag) stars we should achieve very high Strehls (>70% at H) in the IR with the existing MagAO Clio2 (?=1-5.3 ?m) science camera/coronagraph or even higher (~98% Strehl) the Mid-IR (8-26 microns) with the existing BLINC/MIRAC4 science camera in the future. To eliminate non-common path vibrations, dispersions, and optical errors the VisAO science camera is fed by a common path advanced triplet ADC and is piggy-backed on the Pyramid WFS optical board itself. Also a high-speed shutter can be used to block periods of poor correction. The entire system passed CDR in June 2009, and we finished the closed-loop system level testing phase in December 2011. Final system acceptance (“pre-ship” review) was passed in February 2012. In May 2012 the entire AO system is was successfully shipped to Chile and fully tested/aligned. It is now in storage in the Magellan telescope clean room in anticipation of “First Light” scheduled for December 2012. An overview of the design, attributes, performance, and schedule for the Magellan AO system and its two science cameras are briefly presented here.

Close, Laird M.; Males, Jared R.; Kopon, Derek A.; Gasho, Victor; Follette, Katherine B.; Hinz, Phil; Morzinski, Katie; Uomoto, Alan; Hare, Tyson; Riccardi, Armando; Esposito, Simone; Puglisi, Alfio; Pinna, Enrico; Busoni, Lorenzo; Arcidiacono, Carmelo; Xompero, Marco; Briguglio, Runa; Quiros-Pacheco, Fernando; Argomedo, Javier

2012-07-01

19

The Subaru Coronagraphic Extreme AO Project: Progress and Upgrades  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme AO (SCExAO) instrument consists of a high performance Phase Induced Amplitude Apodisation (PIAA) coronagraph combined with an extreme Adaptive Optics (AO) system operating in the near-infrared (H band). The extreme AO system driven by the 2000 element deformable mirror will allow for Strehl ratios>90% to be achieved in the H-band when it goes closed loop. This makes the SCExAO instrument a powerful platform for high contrast imaging down to angular separations of the order of 1 ?/D. In this paper we report on the recent progress in regards to the development of the instrument, which includes the addition of a visible bench that makes use of the light at shorter wavelengths not currently utilized by SCExAO and closing the loop on the tip/tilt wavefront sensor. We will also discuss two exciting guest instruments which will expand the capabilities of SCExAO over the next few years; namely CHARIS which is a integral field spectrograph as well as VAMPIRES, a visible aperture masking experiment based on polarimetric analysis of circumstellar disks.

Jovanovic, Nemanja; Martinache, F.; Guyon, O.; Clergeon, C.; Garrel, V.

2013-01-01

20

Real-time processing for the ATST AO system  

NASA Astrophysics Data System (ADS)

The real-time processing requirements for the four meter Advanced Technology Solar Telescope extended source high order adaptive optics system will be approximately 15 times that of the Dunn Solar Telescope AO systems on which the ATST AO system is based. The ATST AO, with its approximately 1232 subapertures, will use massively parallel processing and is based on Analog Devices TigerSHARC DSPs as the central processing units. We will discuss the requirements for processing and data handling and the architecture of the correlating Shack-Hartmannn and reconstructor processing unit and present the results of bench-mark testing of the DSP hardware that was selected for the ATST AO system.

Richards, K.; Rimmele, T.

21

Performance of Subaru adaptive optics system AO188  

NASA Astrophysics Data System (ADS)

Subaru adaptive optics system (AO188) is an 188-elements curvature sensor adaptive optics system that is operated in both natural and laser guide star modes. AO188 was installed at Nasmyth platform of the Subaru telescope and it has been successfully operating in the natural guide star mode since October 2008. The performance of AO188 in the natural guide star mode has been well verified from on-sky data obtained with the infrared camera and spectrograph (IRCS). Under normal seeing condition, AO188 achieves K-band Strehl ratio between 60% and 70% using R = 9.0 magnitude natural guide stars and it works well with faint guide stars down to R = 16.5 magnitude. We measured the FWHM and Strehl ratio of stellar images in globular clusters and found that the isoplanatic angle is approximately 30 arcsec. In this paper, we describe an overview of the operation procedure for AO188, as well as its performance such as angular resolution, Strehl ration, and sensitivity gain for detecting faint objects.

Minowa, Yosuke; Hayano, Yutaka; Oya, Shin; Watanabe, Makoto; Hattori, Masayuki; Guyon, Olivier; Egner, Sebastian; Saito, Yoshihiko; Ito, Meguro; Takami, Hideki; Garrel, Vincent; Colley, Stephen; Golota, Taras; Iye, Masanori

2010-07-01

22

Dimensioning and performances of an AO system for the SALT  

NASA Astrophysics Data System (ADS)

The Southern African Large Telescope (SALT), located at the South African Astronomical Observatory (SAAO) site near Sutherland, South Africa, is an 11-metre fixed-elevation telescope currently operating at UV-visible wavelengths (320-950 nm) with a near-infrared extension (850-1700 nm) due in the near future. SALT does not currently have an adaptive optics (AO) system and a feasibility study for adding one is under way. Using results from an on-going site monitoring campaign at the SAAO we have begun carrying out simulations to investigate how different AO systems might perform and could be optimized for SALT. We will present the parameters of an optimization study and performance results for a single on-axis natural guide star (NGS) AO system on SALT for operation at both visible (R) and near-IR (J and H) wavelengths.

Catala, L.; Carbillet, M.; Jolissaint, L.; Buckley, D. A. H.; Crawford, S. M.; Pickering, T.

2012-07-01

23

AO327: The Arecibo 327 MHz Drift Pulsar Survey  

NASA Astrophysics Data System (ADS)

The Arecibo 327 MHz drift pulsar survey (AO327) began in 2010 when a platform repair made a lot of observing time available under conditions of limited telescope mobility. The survey continued after the repair was completed, using unallocated or short-notice telescope time to search for pulsars outside of the Galactic plane. AO327 has so far covered about half of the Arecibo sky between declinations of -0.5 and 28 degrees and has discovered eight pulsars in the portion of data that has been processed. One of the new discoveries, J0453+16, has a rotation period of 46 ms and is in a long-period binary. Another new pulsar, J2204+27, has a period of 85 ms and is isolated. We present details on the new discoveries and compare the sensitivity and expected total number of new pulsars from AO327 with similar drift surveys conducted with the Green Bank telescope.

Deneva, Julia S.; Stovall, K.; Jenet, F.; McLaughlin, M.; Freire, P.

2013-01-01

24

A pyramid sensor based AO system for Extremely Large Telescopes  

NASA Astrophysics Data System (ADS)

Since the introduction of the pyramid wavefront sensor in the mid 90s, various authors have shown both theoretically and with the aid of simulations that pyramid sensors can achieve a better performance than traditional Shack-Hartmann wavefront sensors. Recently the First-Light AO system (FLAO) at the Large Binocular Telescope has demonstrated excellent on sky performance achieved with a pyramid based system. Motivated by these results, we will present in this paper a first heuristic analysis scaling up the FLAO performance to the case of an Extremely Large Telescope (ELT). We support our arguments with preliminary numerical simulations for the case of the European ELT using the M4 adaptive corrector and a properly matched pyramid sensor. Such a system could be used as a first-light natural guide-star AO system for the European ELT offering the advantages of a demonstrated AO system with practically off-the-shelf technology.

Quirós-Pacheco, F.; Pinna, E.; Esposito, S.; Riccardi, A.; Rabien, S.

2011-09-01

25

The Subaru coronagraphic extreme AO(SCExAO) system: using new approaches for high contrast imaging on a large telescope  

NASA Astrophysics Data System (ADS)

SCExAO is a flexible platform designed to be inserted between the existing coronagraphic camera HiCIAO and the AO188 Subaru system. It achieves high constrast imaging at small angular separation through a set of innovative techniques. SCExAO performs fine wavefront correction and calibration using a 1K MEMS. The wavefront control architecture is optimized for high contrast imaging, and includes a dedicated low order wavefront sensor using light reflected by the coronagraph focal plane mask. Thanks to custom optics able to remove spiders from the telescope pupil, and PIAA lenses performing lossless beam apodization, SCExAO efficiently delivers high contrast as close as 1?/D. The platform also offers a visible diffraction imaging mode based on a fast frame rate photon counting camera combined with a new data processing algorithm. It also includes an aperture masking mode. SCExAO is currently under integration and testing, and is scheduled for first light on the Subaru Telescope in early 2011.

Garrel, V.; Guyon, O.; Baudoz, P.; Martinache, F.; Cantalloube, F.

2010-10-01

26

DRAGON, a flexible, visible-light AO testbed  

NASA Astrophysics Data System (ADS)

DRAGON is a Durham University adaptive optics testbed, designed to accurately simulate the effects of the atmosphere for the purposes of developing high-order adaptive optics, targeted towards visible AO correction. The design consists of altitude-adjustable phase screens, a realistic sodium guide-star emulator and a set of fixed targets that can also be used as natural guide stars. The design has been optimised for both wide-field (2.5' FoV, hence MCAO/MOAO) and on-axis (SCAO) situations with 4-8m class telescopes. Since it is targeted toward visible AO, high order wavefront sensing and correction are obvious steps towards ELT-scale AO development and a key aspect of DRAGON is the integration of the Durham RTC system (see Basden, these proceedings). The design of DRAGON is discussed and its extensions towards simulating ELT-scale AO in its current configuration is explained, together with a future design explicitly scaled for ELT-scale pupils.

Rolt, Stephen; Basden, Alastair; Bharmal, Nazim; Dipper, Nigel; Geng, Deli; Morris, Tim; Myers, Richard

2011-09-01

27

Adapting optimal LQG methods to ELT-sized AO systems  

NASA Astrophysics Data System (ADS)

The minimum-variance (MV) phase residual Linear-Quadratic-Gaussian (LQG) solution in Adaptive Optics (AO) using fast iterative methods is outlined. Standard LQG computational burden scaling as O(n2) is shown to be O(n log n) using spectral methods. Proof-of-concept is made through Monte Carlo simulations.

Correia, Carlos; Conan, Jean-Marc; Kulcsár, Caroline; Raynaud, Henri-François; Petit, Cyril

28

Overall science goals and top level AO requirements for the E-ELT  

NASA Astrophysics Data System (ADS)

The E-ELT is the most ambitious of the ELTs that are planed. Its main characteristic is to be an adaptive telescope, i.e. AO is included in the telescope design. The science case for the E-ELT is largely driven by a diffraction limited image quality of the telescope. The science goals span from direct imaging and characterisation of exo-planets to studying the most distant objects in the universe. The science cases imply a long term deployment at the telescope of many AO flavours (ground-layer AO, single conjugated AO, laser tomography AO, multi-conjugated AO, multi-object AO, extreme AO). While some of these are covered by the telescope, others will require post-focal AO modules feeding the instruments.

Markus, Kissler-Patig

29

Identification of system misregistrations during AO-corrected observations  

NASA Astrophysics Data System (ADS)

The E-ELT will be equipped with a deformable mirror inside the telescope. The performance of reconstruction and control depends on the calibration of the interaction matrix- or a model of the interaction matrix- , which characterizes the system and the relationship between the commands sent to the deformable mirrors (DM) and the wavefront sensors (WFS) slopes. Such a calibration will be more complex than for the current systems at the VLT since it will have to be at least partly measured on sky and for a much larger number of degrees of freedom (more than 5000). In addition, gravity or temperature variations for instance are likely to introduce slow evolution of the matching between the M4 Deformable mirror and the WFS geometry. This can occur during observations and therefore degrade the adaptive optics (AO) correction. To relax the need of frequent painful calibrations and to prevent a loss of performance due to misregistrations, we investigate how to track the evolution of the interaction matrix errors in closed-loop without introducing any degradation in the observations. This is done thanks to identification methods and optimization theory. First, we formally describe the problem and the difficulties of such an identification in closed-loop configuration. Then, we present 2 solutions, based on the optimization of the error of estimates of the WFS slopes, at the output of the closed-loop AO. The performance of the methods and their limitations are discussed formally and thanks to numerical simulations of a high order AO system. We finally explore to which extent these methods currently studied for the Adaptive Optics Facility (AOF) at the VLT can be applied to the E-ELT.

Béchet, C.; Thiébaut, É.; .; Tallon, M.; Kolb, J.; Madec, P.-Y.

2011-09-01

30

AO/NAO Patterns in the North Atlantic - Arctic Ocean?  

NASA Astrophysics Data System (ADS)

There is little question that on annual to possibly decadal time scales, the AO/NAO has an important influence on climate of the Arctic Ocean and northern North Atlantic; however, it has been widely debated whether the same is true on much longer time scales of multi-centuries to millennia. Some authors claiming NAO dipole or tripole patterns on those time scales in the northern North Atlantic have refuted those claims in later publications. Adding to the problem is the possibility that reduction in thermohaline overturning, local buildup of sea ice, or response to solar variations might produce patterns similar to those of the NAO. Certainly, it is far from clear how a pattern resulting purely from atmospheric forcing can be maintained on long time scales. A compilation of temperature-related records spanning most or all of the Holocene together with new data from cores our group has analyzed does not appear to produce geographic patterns of temperature change that are consistent with the AO/NAO. Those records extend from the Laptev Sea to about 40 degrees N in the North Atlantic and are, with the exception of the Laptev Sea, from the open ocean. The sense of temperature change appears to be the same at all of the coring sites; that is, there is no evidence of multipole patterns. Records from the Labrador Sea and from near-shore areas off the Scotian margin, however, exhibit more complicated patterns, but still not those expected from the AO/NAO. In those more restricted areas, the complicated patterns may reflect local climate dynamics and/or the influence of sea ice cover on near surface ocean temperatures.

Bond, G. C.

2003-12-01

31

Akreos Adapt AO Intraocular Lens Opacification: A Case Report  

PubMed Central

A 79-year-old hyperglycemic patient was referred to the ‘Santa Maria delle Croci’ Hospital, Ravenna, Italy. He presented with visual impairment in the right eye. Four years ago, he had had an uneventful cataract surgery in the right eye. We observed an opacification of the intraocular lens (IOL) causing significant visual disturbance. The IOL was exchanged. Unfortunately, pathologic analysis was not performed. Patient-related factors such as hyperglycemia and hypertension might have been responsible for the opacification. To our knowledge, there is only one previous report of opacification of the Akreos Adapt AO IOL.

Forlini, Matteo; Orabona, Giancarlo Dell'Aversana; Bratu, Adriana Ionela; Rossini, Paolo; Cavallini, Gian Maria; Forlini, Cesare

2013-01-01

32

Titanium alloys (AoN) and their involvement in osseointegration  

PubMed Central

Background: Osseointegration is essential for a long-term successful and inflammation-free dental implant. Such a result depends on osteoblastic cells growth and differentiation at the tissue-implant interface. The aim of this study was to compare two different AoN titanium layers (GR4 and GR5) to investigate which one had a greater osteoconductive power using human osteoblasts (HOb) culture at two different time-points. Materials and Methods: The expression levels of some bone-related (ALPL, COL1A1, COL3A1, SPP1, RUNX2, and SPARC) were analyzed using real time reverse transcription-polymerase chain reaction (real time RT-PCR). Results: Real-time RT-PCR data showed that after 3 days of treatment with TiA4GR, the genes up-regulated were COL3A1, ALPL, SPP1, and RUNX2. Moreover, no difference in gene expression was noticed 4 days later. On the other hand, the genes that overexpressed after 3 days of treatment with AoN5GR were ALPL, SPP1, and RUNX2. In both cases, the expression of COL1A1 and SPARC was negatively regulated. Conclusion: Our data showed that both titanium surfaces led to osteoblasts recruitment, maturation, and differentiation, thus promoting osseointegration at the tissue-implant interface.

Danza, Matteo; Zollino, Ilaria; Candotto, Valentina; Cura, Francesca; Carinci, Francesco

2012-01-01

33

AOS Handbook: A User's Guide to the CCSDS Standards for Advanced Orbiting Systems.  

National Technical Information Service (NTIS)

This Advanced Orbiting Systems (AOS) handbook is intended to help implementers and users of communications and data handling systems who are adhering to the Consultative Committee for Space Data Systems (CCSDS) recommendation for AOS. The handbook provide...

D. Stanton W. R. Burke

1991-01-01

34

Searching and Studying Binary Asteroids with AO Systems  

NASA Astrophysics Data System (ADS)

Our group has conducted adaptive optics observations of asteroids since 2001. Our main goal is the search and study of binary asteroids using several AO systems (Lick, Keck, VLT) and related technique such as Appulse (Berthier and Marchis, 2002) and Laser Guide Star observations (Marchis et al., AGU-EGS, 2003) to broaden the sample of asteroids observed from the main-belt out to the Kuiper Belt. We focussed our program last year on Trojan Asteroids. Six of them were observed using Appulses with Keck AO ( ˜0.05-0.10", mv=15.4-18.5), 6 with the LGS at Lick ( ˜0.25-0.35", mv<16) and 12 with the VLT/NACO system ( ˜0.10-0.14"; mv<16.7). None of these observations reveals the presence of a companion. Based on this sample, and including 617 Patroclus binary asteroid discovered by Merline et al. (IAU, 7741, 2001), we deduce that the proportion of binary Trojan asteroids larger than 40 km is less than 4%. We will promote and discuss a technique of the analysis of negative discovery in large samples. In January 2003, we conducted an observing campaign spanning 5 days of 121 Hermione with NACO, the new AO system offered at VLT. This C-type asteroid was discovered by Merline et al. (IAU, 7980, 2002). The companion, 6.1 mag fainter than the primary, is easily detected despite the faintness of the asteroid (mv ˜13). We use the method described in Marchis et al. (Icarus, 2003) to determine the orbit of the companion. Its orbital elements are a=794.7+/-2.1 km, and P=1.643+/-0.005 days. We derived a mass =1.47E19 kg, and a density of 3.1+/-0.8 g cm-3 (using IRAS diameter of 209+/-4.7 km). Considering typical densities of meteorite analogues (CI or CM carboneceous chondrite) would led to an extremely low macro-porosity of p<3%. This suggests that the volume of Hermione is ˜30% larger, which is also supported by our resolved images of this body. This work supported by the National Science Foundation Science and Technology Center for Adaptive Optics, based partly on observations collected at the European Southern Observatory, Chile.

Marchis, F.; Descamps, P.; Berthier, J.; Hestroffer, D.; de Pater, I.; Conrad, A.; Le Mignant, D.; Chaffee, F.; Gavel, D.

2003-05-01

35

AO Real-time Control Systems for the ELT Era  

NASA Astrophysics Data System (ADS)

Adaptive Optics systems for instruments on the next generation of astronomical telescopes will be of a significantly higher order than those for existing systems. The requirements for processing power for real-time computers to control such systems will be substantial and may well not be met by the simple application of the next generation of CPU based computers. We present here an overview of the various designs for future real-time computer systems that are being investigated at Durham involving the acceleration (or replacement) of CPU systems by GPU and FPGA based hardware. We address the ongoing argument of which of these technologies should be employed for which applications. We present our plans for the testing of these technologies both in the laboratory and on-sky in the CANARY AO demonstrator at the 4m William Herschel Telescope, along with initial results.

Dipper, N. A.; Basden, A.; Geng, D.; Younger, E. J.

2011-09-01

36

The 1987 outburst of the BL Lacertid AO 0235 + 164  

NASA Astrophysics Data System (ADS)

The violently variable BL Lacertid AO 0235 + 164 displayed a 3.24 magnitude outburst in early 1987. This outburst was observed intensively from Rosemary Hill Observatory in three colors. Long term monitoring observations made at Rosemary Hill are examined in an effort to find any recurring timescales associated with this outburst and previous large amplitude outbursts. The energetics of the 1987 outburst are analyzed in terms of the Shields and Wheeler model of a magnetized accretion disk. The timescales identified in the power spectrum (2.8 and 1.6 yr) are input into the model as the storage timescales. Since the emitted energy calculated from the optical burst cannot be stored in a magnetized disk at an allowable radius, it is concluded that either the storage timescales are longer than those identified in the power spectrum, or relativistic beaming effects must be considered, with a Doppler factor of 1.3 to 1.6.

Webb, J. R.; Smith, A. G.

1989-08-01

37

Robo-AO: autonomous and replicable laser-adaptive-optics and science system  

NASA Astrophysics Data System (ADS)

We have created a new autonomous laser-guide-star adaptive-optics (AO) instrument on the 60-inch (1.5-m) telescope at Palomar Observatory called Robo-AO. The instrument enables diffraction-limited resolution observing in the visible and near-infrared with the ability to observe well over one-hundred targets per night due to its fully robotic operation. Robo-AO is being used for AO surveys of targets numbering in the thousands, rapid AO imaging of transient events and long-term AO monitoring not feasible on large diameter telescope systems. We have taken advantage of cost-effective advances in deformable mirror and laser technology while engineering Robo-AO with the intention of cloning the system for other few-meter class telescopes around the world.

Baranec, C.; Riddle, R.; Ramaprakash, A. N.; Law, N.; Tendulkar, S.; Kulkarni, S.; Dekany, R.; Bui, K.; Davis, J.; Burse, M.; Das, H.; Hildebrandt, S.; Punnadi, S.; Smith, R.

2012-07-01

38

Optimal projection of reconstructed layers onto deformable mirrors with fractal iterative method for AO tomography  

NASA Astrophysics Data System (ADS)

FrIM-3D is a novel algorithm developed for high performance in Adaptive Optics (AO) on the Extremely Large Telescopes. It particularly solves the problem of the minimum-variance tomographic reconstruction involved in AO. Until recently however, it was missing an optimal projection of the reconstructed atmosphere on the space of deformable mirrors, to guarantee the best performance for every tomographic AO system. In this paper, we present a formal solution to this projection problem. For that, a formalism based on continuous functions and modeling of the AO is chosen, in order to clearly analyze the modeling approximations. The projector is defined as the solution of an optimization problem with respect to AO objectives, potentially different for every wide-field AO system. After the projector derivation, we describe a fast algorithm to apply it, and in particular how to handle the piston-removal computations. This algorithm is currently being implemented as part of FrIM-3D.

Brunner, E.; Béchet, Cl.; Tallon, M.

2012-07-01

39

Diferentes metodologias aplicadas ao ensino de astronomia no Ensino Médio  

NASA Astrophysics Data System (ADS)

O presente trabalho de intervenção foi realizado junto à Escola Estadual Colònia dos Pescadores na cidade de Caraguatatuba, com très turmas do terceiro ano do Ensino Médio, envolvendo 119 alunos com idades entre 16 e 19 anos. A fase inicial foi composta de um questionário de vinte questíes dissertativas e objetivas, aplicado pelo professor titular da sala, que era o mesmo nas très turmas, para diagnosticar nos educandos os conceitos prévios sobre Astronomia e, partindo destes realizar um trabalho de intervenção nas classes envolvidas utilizando, em cada uma, metodologias diferentes: (A) sob forma de seminários, elaborados e apresentados pelos educandos, no qual o educador faz apenas as intervençíes necessárias; (B) de forma tradicional, com auxílio de multimídias para desenvolvimento das aulas e a terceira (C) tradicional, fazendo uso exclusivo de lousa e giz. Ao final do trabalho os alunos responderam novamente o questionário inicial para diagnosticar dentre as très metodologias utilizadas qual apresentou melhores aplicaçíes, os resultados iniciais foram comparados com os finais. Quando questionados a respeito do significado de Astronomia observou-se inicialmente que os acertos na turma A foram de 100%, turma B: 64%, turma C: 84%, após a intervenção os acertos foram: 100%, 97% e 85% respectivamente, demonstrando que houve um avanço significativo na turma B, a turma A manteve seu índice e a turma C evoluiu, porém não tanto quanto a B. Quando interrogados sobre quantos planetas vocè acha que existem em nosso Sistema Solar? os acertos foram: turma A: 39%, turma B: 48% e turma C: 46%, após o desenvolvimento do trabalho os acertos foram 94%, 97% e 90% respectivamente. Dentro das respostas obtidas observa-se que a metodologia tradicional com o auxílio de multimeios, aplicada na turma B, demonstrou melhores resultados, sendo a mais significativa. Outra conclusão muito importante é que apesar de o tema Astronomia ser amplamente recomendado, este não é ensinado, nem no Ensino Fundamental, nem no Ensino Médio.

Albrecht, E.; Voelzke, M. R.

2009-03-01

40

Multi-conjugate AO for the European Solar Telescope  

NASA Astrophysics Data System (ADS)

The European Solar Telescope (EST) will be a 4-meter diameter world-class facility, optimized for studies of the magnetic coupling between the deep photosphere and upper chromosphere. It will specialize in high spatial resolution observations and therefore it has been designed to incorporate an innovative built-in Multi-Conjugate Adaptive Optics system (MCAO). It combines a narrow field high order sensor that will provide the information to correct the ground layer and a wide field low order sensor for the high altitude mirrors used in the MCAO mode. One of the challenging particularities of solar AO is that it has to be able to correct the turbulence for a wide range of observing elevations, from zenith to almost horizon. Also, seeing is usually worse at day-time, and most science is done at visible wavelengths. Therefore, the system has to include a large number of high altitude deformable mirrors. In the case of the EST, an arrangement of 4 high altitude DMs is used. Controlling such a number of mirrors makes it necessary to use fast reconstruction algorithms to deal with such large amount of degrees of freedom. For this reason, we have studied the performance of the Fractal Iterative Method (FriM) and the Fourier Transform Reconstructor (FTR), to the EST MCAO case. Using OCTOPUS, the end-to-end simulator of the European Southern Observatory, we have performed several simulations with both algorithms, being able to reach the science requirement of a homogeneous Strehl higher that 50% all over the 1 arcmin field of view.

Montilla, I.; Béchet, C.; Le Louarn, M.; Tallon, M.; Sánchez-Capuchino, J.; Collados Vera, M.

2012-07-01

41

Investigações matemáticas na aprendizagem do 2º ciclo do ensino básico ao ensino superior  

Microsoft Academic Search

A visão de que um ensino incidindo sobre a resolução de tarefas rotineiras é desajustado das necessidades colocadas por uma sociedade que evolui rapidamente, tem enquadrado e determinado opções e decisões ao nível do desenvolvimento curricular em Matemática. Este facto toma uma importância ainda maior se atendermos ao alargamento da escolaridade obrigatória verificado nos últimos anos. Conceber e implementar programas

Leonor Santos; Joana Brocardo; Manuela Pires; Ana Isabel Rosendo

42

Enabling Technologies for Visible Adaptive Optics: The Magellan Adaptive Secondary VisAO Camera  

Microsoft Academic Search

Since its beginnings, diffraction-limited ground-based adaptive optics (AO) imaging has been limited to wavelengths in the near IR ({\\\\lambda} > 1 micron) and longer. Visible AO ({\\\\lambda} < 1 micron) has proven to be difficult because shorter wavelengths require wavefront correction on very short spatial and temporal scales. The pupil must be sampled very finely, which requires dense actuator spacing

Derek Kopon; Jared R. Males; Laird M. Close; Victor Gasho

2010-01-01

43

Guidebook for Operationalizing AoA's. Definition of Rural, Summer, 1996.  

National Technical Information Service (NTIS)

The 1992 Amendments to the Older Americans Act (OAA) require that AoA specify a standard definition of 'rural' for OAA programs. The purpose of this booklet is to describe the proposed AoA defintion and to present a way in which the definition can be oper...

1996-01-01

44

Robo-AO: The First Autonomous Laser Guide Star Adaptive Optics System for Small Telescopes  

Microsoft Academic Search

Robo-AO will be the first fully autonomous laser guide star adaptive optics and science system. Specifically designed to take advantage of small (1 to 3 meter) telescopes, Robo-AO will deliver high angular resolution science in the visible and near infrared for up to hundreds of targets per night. This will enable the exploration of science programs not practical for larger

Reed L. Riddle; C. Baranec; A. N. Ramaprakash; N. Law; S. Tendulkar; S. Kulkarni; K. Bui; M. Burse; P. Chordia; H. Das; R. Dekany; M. Kasliwal; E. Ofek; J. Zolkower

2011-01-01

45

Impacts of ENSO and AO/NAO on the Interannual Variability of Great Lakes Ice Cover.  

National Technical Information Service (NTIS)

The impacts of El Nino and South Oscillation (ENSO) and Arctic Oscillation (AO) or North Atlantic Oscillation (NAO) on Great Lakes ice cover were investigated using ice observations for winters 1963-2008 and National Centers for Environmental Prediction (...

A. Clites C. Sellinger J. Wang R. Assel X. Bai

2010-01-01

46

GLAS\\/NAOMI: ground-layer AO at the William Herschel Telescope  

Microsoft Academic Search

GLAS is an upgrade of the William Herschel Telescope's existing natural-guide-star (NGS) AO system NAOMI to incorporate a 20-W Rayleigh laser guide star (LGS) projected to an altitude of 15 km. It is currently being commissioned on-sky, and we review here the current status of the project. GLAS\\/NAOMI delivers dramatic improvements in PSF in both the near-IR (AO-corrected FWHM close

Chris Benn; Don Abrams; Tibor Agocs; Diego Cano; Tom Gregory; Juan Carlos Guerra; Olivier Martin; Tim Morris; Richard Myers; Samantha Rix; Rene Rutten; Ian Skillen; Jure Skvarc; Simon Tulloch

2008-01-01

47

Enabling Technologies for Visible Adaptive Optics: The Magellan Adaptive Secondary VisAO Camera  

Microsoft Academic Search

Since its beginnings, diffraction-limited ground-based adaptive optics (AO)\\u000aimaging has been limited to wavelengths in the near IR ({\\\\lambda} > 1 micron)\\u000aand longer. Visible AO ({\\\\lambda} < 1 micron) has proven to be difficult\\u000abecause shorter wavelengths require wavefront correction on very short spatial\\u000aand temporal scales. The pupil must be sampled very finely, which requires\\u000adense actuator spacing

Derek Kopon; Jared R. Males; Laird M. Close; Victor Gasho

2010-01-01

48

Enabling technologies for visible adaptive optics: the Magellan adaptive secondary VisAO camera  

Microsoft Academic Search

Since its beginnings, diffraction-limited ground-based adaptive optics (AO) imaging has been limited to wavelengths in the near IR (lambda>1mum) and longer. Visible AO (lambda>1mum) has proven to be difficult because shorter wavelengths require wavefront correction on very short spatial and temporal scales. The pupil must be sampled very finely, which requires dense actuator spacing and fine wavefront sampling with large

Derek Kopon; Jared Males; Laird M. Close; Victor Gasho

2009-01-01

49

Status update and closed-loop performance of the Magellan adaptive optics VisAO camera  

NASA Astrophysics Data System (ADS)

We present laboratory results of the closed-loop performance of the Magellan Adaptive Optics (AO) Adaptive Secondary Mirror (ASM), pyramid wavefront sensor (PWFS), and VisAO visible adaptive optics camera. The Magellan AO system is a 585-actuator low-emissivity high-throughput system scheduled for first light on the 6.5 meter Magellan Clay telescope in November 2012. Using a dichroic beamsplitter near the telescope focal plane, the AO system will be able to simultaneously perform visible (500-1000 nm) AO science with our VisAO camera and either 10 ?m or 3-5 ?m science using either the BLINC/MIRAC4 or CLIO cameras, respectively. The ASM, PWS, and VisAO camera have undergone final system tests in the solar test tower at the Arcetri Institute in Florence, Italy, reaching Strehls of 37% in i'-band with 400 modes and simulated turbulence of 14 cm ro at v-band. We present images and test results of the assembled VisAO system, which includes our prototype advanced Atmospheric Dispersion Corrector (ADC), prototype calcite Wollaston prisms for SDI imaging, and a suite of beamsplitters, filters, and other optics. Our advanced ADC performs in the lab as designed and is a 58% improvement over conventional ADC designs. We also present images and results of our unique Calibration Return Optic (CRO) test system and the ASM, which has successfully run in closedloop at 1kHz. The CRO test is a retro reflecting optical test that allows us to test the ASM off-sky in close-loop using an artificial star formed by a fiber source.

Kopon, Derek; Close, Laird M.; Males, Jared; Gasho, Victor; Morzinski, Katie; Follette, Katherine

2012-07-01

50

Extreme Adaptive Optics in the mid-IR: The METIS AO system  

NASA Astrophysics Data System (ADS)

Adaptive Optics at mid-IR wavelengths has long been seen as either not necessary or easy. The impact of atmospheric turbulence on the performance of 8-10 meter class telescopes in the mid-IR is relatively small compared to other performance issues like sky background and telescope emission. Using a relatively low order AO system, Strehl Ratios of larger than 95% have been reported on 6-8 meter class telescopes. Going to 30-42 meter class telescopes changes this picture dramatically. High Strehl Ratios require what is currently considered a high-order AO system. Furthermore, even with a moderate AO system, first order simulations show that the performance of such a system drops significantly when not taking into account refractivity effects and atmospheric composition variations. Reaching Strehl Ratios of over 90% at L, M and N band will require special considerations and will impact the system design and control scheme of AO systems for mid-IR on ELTs. In this paper we present an overview of the effects that impact the performance of an AO system at mid-IR wavelengths on an ELT and simulations on the performance and we will present a first order system concept of such an AO system for METIS, the mid-IR instrument for the E-ELT.

Stuik, R.; Jolissaint, L.; Kendrew, S.; Hippler, S.; Brandl, B.; Venema, L.

51

A computa»c~ao numerica como ferramenta para o professor de F¶‡sica do Ensino Medio  

Microsoft Academic Search

A proposta deste trabalhoe apresentar ao professor de F¶‡sica do ensino medio uma forma de empregar recur- sos computacionais para esclarecer e aprofundar conceitos de F¶‡sica que s~ao explorados de forma limitada por n~ao se poder recorrer ao Calculo Diferencial e Integral. O p^endulo simplese usado como prototipo para o trata- mento sugerido. Mostramos que apenas com o aux¶‡lio de

Augusto Cesar; Claudio Gon; Marcus Vinicius; Tovar Costa

52

Te Ao Kori as Expressive Movement in Aotearoa New Zealand Physical Education Teacher Education (PETE): A Narrative Account  

ERIC Educational Resources Information Center

|A unique aspect of Aotearoa/New Zealand physical education is the inclusion of Maori culture in the form of te ao kori. Te ao kori translates to mean the world of movement and is represented by the interpretation of indigenous movement, games and pastimes. Participation in te ao kori means the sports-based normative frame of reference for…

Legge, Maureen

2011-01-01

53

Use of two deformable mirrors AO system for an interferometric testbed  

NASA Astrophysics Data System (ADS)

In this paper, we present results on a test-bed for the use of adaptive optics (AO) in optical interferometry. The test-bed is based on two deformable mirrors made by OKO technologies. The two mirrors are simultaneously controlled by the same computer and control software. The experimental set is based on our portable adaptive optics system. The goal of this test-bed is to study and characterize the effects of aberrations on the fringe contrast and the effects and characterization of the use of AO for improving fringe contrast. In this paper we will report some field test of our portable AO system. We will also describe the test-bed and some of the experimental results obtained so far.

Restaino, Sergio R.; Wick, David V.; Martinez, Ty; Payne, Don T.; Gilbreath, G. C.

2004-10-01

54

Use of Two Deformable Mirrors AO System for an Interferometric Test-Bed.  

National Technical Information Service (NTIS)

In this paper, we present results on a test-bed for the use of adaptive optics (AO) in optical interferometry. The test-bed is based on two deformable mirrors made by OKO technologies. The two mirrors are simultaneously controlled by the same computer and...

D. T. Payne D. V. Wick G. C. Gilbreath S. R. Restaino T. Martinez

2004-01-01

55

The relationship between snowpack dynamics and NAO\\/AO indices in SW Spitsbergen  

Microsoft Academic Search

This paper shows that maximum snow depth and the length of accumulation and ablation periods observed at the local scale of Hornsund, SW Spitsbergen, are partly explained by monthly and seasonal values of the AO and NAO indices in the given and previous hydrological years. This analysis is followed by an application of a statistically efficient lumped parameter time series

Bartlomiej Luks; Marzena Osuch; Renata J. Romanowicz

2011-01-01

56

Io volcanic activity captured in full motion with the Keck AO system  

Microsoft Academic Search

Io was observed in December 2001 with the NIRC2 camera, mounted on the Keck II Adaptive Optics (AO) system. Fourteen Observations were performed on ten days in three broadband infrared filters K (2.2 mum), L' (3.8 mum) and Ms (4.7 mum). The angular resolution achieved is 0.05\\

F. Marchis; D. Le Mignant; I. de Pater; R. Prange; T. Fusco; F. Chaffee

2003-01-01

57

Integration and test of the flrst Light AO system for LBT  

Microsoft Academic Search

The paper describes the single conjugate AO system called WLBT to be mounted at LBT in late summer 2004. The WLBT is part of the Acquisition, Guiding & Wavefront sensing unit (AGW)1 attached to the front bent Gregorian foci derotator. The two key features of this system are the use of a pyramid wavefront sensor with variable sampling between 30x30

S. Esposito; A. Tozzi; E. Pinnaa Puglisi; P. Stefanini; F. Camiciottoli; J. Storm

58

Integration and test of the first light AO system for LBT  

Microsoft Academic Search

The paper describes the single conjugate AO system called WLBT to be mounted at LBT in late summer 2004. The WLBT is part of the Acquisition, Guiding & Wavefront sensing unit (AGW) attached to the front bent Gregorian foci derotator. The two key features of this system are the use of a pyramid wavefront sensor with variable sampling between 30x30

Simone Esposito; Andrea Tozzi; Alfio T. Puglisi; Enrico Pinna; Paolo Stefanini; Gabriele Giorgetti; Fabrizio Camiciottoli; Piero Salinari; Paolo Bianchi; Jesper Storm

2004-01-01

59

Binding of pesticide 2,4-D to SDS and AOS micellar flocculates  

Microsoft Academic Search

Adsorptive micellar flocculation (AMF) is a surfactant-based separation process consisting in the capture of organic anionic pollutants by large flocs forming due to coagulation of micelles of the anionic surfactants SDS and AOS. The capture makes the pollutant susceptible of removal with the flocs by coarse filtration. This paper discusses the mechanism governing the partition of the pollutant between the

Federico I Talens-Alesson

2001-01-01

60

Storage Stability of Jet Fuel Not Containing Anti-Oxidant (AO).  

National Technical Information Service (NTIS)

This program assessed the effectiveness of adding anti-oxidant (AO) to various fuels after the fuels leave the refinery. The project involved storing severely hydro-treated fuels for a period of 12 months to simulate the 36 month storage period for vehicl...

G. B. Bessee I. G. Wilson S. O'Brien

2012-01-01

61

Effects of adrenergic agents on the expression of zebrafish (Danio rerio) vitellogenin Ao1  

SciTech Connect

Teleost vitellogenins (VTGs) are large multidomain apolipoproteins, traditionally considered to be estrogen-responsive precursors of the major egg yolk proteins, expressed and synthesized mainly in hepatic tissue. The inducibility of VTGs has made them one of the most frequently used in vivo and in vitro biomarkers of exposure to estrogen-active substances. A significant level of zebrafish vtgAo1, a major estrogen responsive form, has been unexpectedly found in heart tissue in our present studies. Our studies on zebrafish cardiomyopathy, caused by adrenergic agonist treatment, suggest a similar protective function of the cardiac expressed vtgAo1. We hypothesize that its function is to unload surplus intracellular lipids in cardiomyocytes for 'reverse triglyceride transportation' similar to that found in lipid transport proteins in mammals. Our results also demonstrated that zebrafish vtgAo1 mRNA expression in heart can be suppressed by both {alpha}-adrenergic agonist, phenylephrine (PE) and {beta}-adrenergic agonist, isoproterenol (ISO). Furthermore, the strong stimulation of zebrafish vtgAo1 expression in plasma induced by the {beta}-adrenergic antagonist, MOXIsylyl, was detected by Enzyme-Linked ImmunoSorbent Assay (ELISA). Such stimulation cannot be suppressed by taMOXIfen, an antagonist to estrogen receptors. Thus, our present data indicate that the production of teleost VTG in vivo can be regulated not only by estrogenic agents, but by adrenergic signals as well.

Yin Naida [Key Laboratory of Biodiversity and Conservation of Aquatic Organisms, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China); Jin Xia; He Jiangyan [Key Laboratory of Biodiversity and Conservation of Aquatic Organisms, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072 (China); Yin Zhan [Key Laboratory of Biodiversity and Conservation of Aquatic Organisms, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China)], E-mail: zyin@ihb.ac.cn

2009-07-01

62

Performance of a MEMS-based AO-OCT system using Fourier Reconstruction  

SciTech Connect

Adaptive optics (AO) and optical coherence tomography (OCT) are powerful imaging modalities that, when combined, can provide high-resolution (3.5 {micro}m isotropic), 3-D images of the retina. The AO-OCT system at UC Davis has demonstrated the utility of this technology for microscopic, volumetric, in vivo retinal imaging. The current system uses an AOptix bimorph deformable mirror (DM) for low-order, high-stroke correction and a 140-actuator Boston Micromachines DM for high-order correction. Developments to improve performance or functionality of the instrument are on-going. Based on previous work in system characterization we have focused on improved AO control. We present preliminary results and remaining challenges for a newly implemented Fourier transform reconstructor (FTR). The previously reported error budget analysis is also reviewed and updated, with consideration of how to improve both the amount of residual error and the robustness of the system. Careful characterization of the AO system will lead to improved performance and inform the design of future systems.

Evans, J; Zawadzki, R; Jones, S; Olivier, S; Werner, J S

2009-01-21

63

The METIS AO system: bringing extreme adaptive optics to the mid-IR  

NASA Astrophysics Data System (ADS)

METIS (Mid-infrared E-ELT Imager and Spectrometer) is the mid-infrared instrument proposed for the European Extremely Large Telescope (E-ELT). METIS will be the first instrument in the mid-IR that will actually require an Adaptive Optics system in order to reach a performance close to the diffraction limit. Extending Adaptive Optics for the mid-IR from the current generation of telescopes to 30-42 meter telescopes is technically challenging, but appears at first sight significantly easier than at visible and near infrared wavelengths. Adaptive Optics has been demonstrated to deliver Strehl Ratios exceeding 95% on 6-8 meter class telescopes at 10 microns, but achieving this performance on E-ELTs under normal observation conditions, requires that several higher order effects are taken into account. The performance of a mid-IR AO system drops significantly if refractivity effects and atmospheric composition variations are not compensated. Reaching Strehl Ratios of over 90% in the L, M and N band will require special considerations and will impact the system design and control scheme of AO systems for mid-IR on ELTs. The METIS instrument has finalized its preliminary design phase and in this paper we present the results of our performance estimates of the METIS AO system. We have included the effects of refractivity and composition fluctuations on the performance of the AO system and we have investigated how these effects impact the science cases for mid-IR instrumentation on an ELT.

Stuik, R.; Jolissaint, L.; Kendrew, S.; Hippler, S.; Brandl, B.; Venema, L.; Lenzen, R.; Pantin, E.; Blommaert, J.; Glasse, A.

2010-07-01

64

Rise of the Machines: Automated Laser Guide Star Adaptive Optics Observations of Thousands of Objects with Robo-AO  

NASA Astrophysics Data System (ADS)

Robo-AO is the first fully automated laser guide star adaptive optics instrument. Robo-AO has completed thousands of automated AO observations at the visible diffraction limit for several scientific programs during its first semester of science observations. These programs include: the Ultimate Binarity Survey to examine stellar binarity properties across the main sequence and beyond; a survey of 1,000 Kepler objects of interest; the multiplicity of solar type stars; and several programs for high precision astrometric observations. A new infrared camera is under development for Robo-AO, and a clone of the system is in the planning stages. This presentation will discuss the Robo-AO instrument capabilities, summarize the science programs undertaken, and discuss the future of Robo-AO.

Riddle, Reed L.; Baranec, C.; Law, N. M.; Tendulkar, S. P.; Ramaprakash, A. N.; Kulkarni, S. R.; Dekany, R.; Bui, K.; Burse, M.; Das, H.; Punnadi, S.; Chordia, P.

2013-01-01

65

DM dimensioning for the next generation AO systems : strategies and rules  

NASA Astrophysics Data System (ADS)

Adaptive optics (AO) provides a real time correction of turbulence and allows to improve the angular resolution of the astronomical telescopes. The design of AO systems and of its key components (deformable mirror (DM), wave-front sensors...) is very important to provide the best performance. The definition rules are well known for 10m class telescopes. However the study of the next generation of telescopes, especially the Extremely Large Telescope (ELT), associated with the development of new technological solutions, particularly concerning DMs, require to refine and in some cases to reconsider these rules. Both turbulent parameters (seeing, outer scale ...), telescope effects, system design and performance requirements have to be considered in order to define the DM key parameters (stroke, inter-actuator stroke, influence function ...). We present a study based on the combination of analytical expressions and numerical simulation results. We do not give absolute rules of design but we present key aspects to keep in mind when designing the DM.

Costille, A.; Conan, J.-M.

2007-07-01

66

Latest Mems DM Developments and the Path Ahead at IRIS AO, Inc. Poster Paper  

NASA Astrophysics Data System (ADS)

Iris AO currently fabricates 37-segment DMs with 5?m stroke, 3.5 mm inscribed aperture, and 2.3 kHz roll off frequency. The DMs are positioned with simple piston/tip/tilt commands rather than nonlinear voltages by using a calibrated position controller and calibrated drive electronics. Open-loop positioning errors of less than 30 nm rms have been shown over the majority of the operating space using the calibrated controller. This paper will present an update of development at Iris AO on segmented deformable mirrors (DM), compact drive electronics, and control techniques for the DM. It will also describe current research directions geared towards making MEMS DMs easier to use and increasing performance while reducing cost.

Helmbrecht, M. A.; Doble, N.; Kempf, C. J.; He, M.

2008-01-01

67

Increasing sky coverage with the Gemini North ALTAIR/LGS AO system  

NASA Astrophysics Data System (ADS)

The Gemini North (GN) AO system, Altair, has been routinely operating in LGS mode since 2007. Due to the initial optical design, the NGS field-of-view (FoV) is limited to a radius ~ 25" which limits the potential science. To improve this, we have tested the AO/LGS operation using a peripheral wavefront sensor (PWFS) whose patrol field is ~ 4'-7' from the target. This expanded NGS FoV permits greater sky coverage but with decreased resolution, FWHM ~ 0.1" - 0.2" making this mode very suitable for non-imaging spectrographic and integral field unit observations. We present the hardware and software upgrades to PWFS and Altair as well as the software necessary for making this observing mode a routine and integral part of GN operations. Characterization and performance of this new operation mode, known as LGS+P1, are presented.

Christou, Julian C.; Boccas, Maxime; Ebbers, Angelic; McDermid, Richard M.; Oram, Richard; Trujillo, Chadwick; Walls, Brian

2012-07-01

68

Software control and characterization aspects for image derotator of the AO188 system at Subaru  

NASA Astrophysics Data System (ADS)

The image derotator is an integral part of the AO188 System at Subaru Telescope. In this article software control, characterization and integration issues of the image derotator for AO188 System presented. Physical limitations of the current hardware reviewed. Image derotator synchronization, tracking accuracy, and problem solving strategies to achieve requirements presented. It's use in different observation modes for various instruments and interaction with the telescope control system provides status and control functionality. We describe available observation modes along with integration issues. Technical solutions with results of the image derotator performance presented. Further improvements and control software for on-sky observations discussed based on the results obtained during engineering observations. An overview of the requirements, the final control method, and the structure of its control software is shown. Control limitations and accepted solutions that might be useful for development of other instrument's image derotators presented.

Golota, Taras; Oya, Shin; Egner, Sebastian; Watanabe, Makoto; Eldred, Michael; Minowa, Yosuke; Takami, Hideki; Cook, David; Hayano, Yutaka; Saito, Yoshihiko; Hattori, Masayuki; Garrel, Vincent; Ito, Meguru

2010-07-01

69

Wrist arthrodesis with the AO titanium wrist fusion plate: a consecutive series of 42 cases.  

PubMed

In a 4 year period (1996-1999), 42 total wrist fusions in 25 men and 17 women were performed using the AO/ASIF Titanium wrist fusion plate. The median age of the patients at the time of surgery was 41 (range, 19-72) years. The indication for fusion was post-traumatic arthritis in 29 wrists, Kienböck's disease in eight, rheumatoid arthritis in three, mono-arthritis in one and Volkmann's contracture in one. All patients were reviewed at a median follow-up of 23 (range, 6-50) months. The Buck-Gramcko and Lohmann score for functional evaluation was excellent in 35, good in 5 and satisfactory in 2 patients. We conclude that wrist arthrodesis with the AO/ASIF Titanium wrist fusion plate is an excellent option for treatment of various painful disorders of the wrist. PMID:11469839

Houshian, S; Schrøder, H A

2001-08-01

70

Superconducting Transition in the ?-Pyrochlore AOs2O6 (A = Cs, Rb, K) under Pressure  

NASA Astrophysics Data System (ADS)

Pressure dependence of superconducting transition temperature Tc has been determined through the DC magnetic measurements under pressure up to P = 10 GPa for ?-pyrochlore oxides AOs2O6 with A = Cs (Tc = 3.3 K), Rb (6.3 K), and K (9.6 K). Both for A = Rb and Cs, Tc increases with increasing P and shows a saturation at Tcm˜ 8.8 K, which is considered as the upper limit of Tc inherent in AOs2O6. In contrast, the Tc-P curve for KOs2O6 shows a sharp maximum of ˜10 K at P˜ 0.5 GPa, and Tc is higher than Tcm for 0? P? 1.5 GPa, suggesting the enhanced superconductivity due to the rattling of K ions.

Miyoshi, Kiyotaka; Takaichi, Yuta; Takamatsu, Yusuke; Miura, Motonobu; Takeuchi, Jun

2008-04-01

71

Safety evaluation of pectin-derived acidic oligosaccharides (pAOS): genotoxicity and sub-chronic studies.  

PubMed

Pectin-derived acidic oligosaccharides (pAOS) are non-digestible carbohydrates to be used in infant formulae and medical nutrition. To support its safety, the genotoxic potential of pAOS was evaluated. pAOS was not mutagenic in the Ames test. Positive results were obtained in the chromosome aberration test only at highly cytotoxic concentrations. The effects obtained in the mouse lymphoma test were equivocal; pAOS was not mutagenic in vivo. A sub-chronic dietary study, preceded by 4-week parental and in utero exposure phase, investigated general safety. Administration of pAOS did not affect parental health nor pup characteristics. No effects specific for acidic oligosaccharides were observed in the subsequent sub-chronic study. Slight diffuse hyperplasia of epithelial layer of the urinary bladder was noted to result from concurrently elevated urinary sodium, due to high sodium in pAOS, and elevated urinary pH. This phenomenon was confirmed in a mechanistic (sub-chronic) study. In contrast, in rats fed pAOS in combination with NH(4)Cl, an acidifying agent, the induced low urinary pH completely prevented the development of urothelial hyperplasia. Hyperplasia induced by this mechanism in rats is considered not relevant to man. Based on the current knowledge we consider pAOS safe for human consumption under its intended use. PMID:20026148

Garthoff, Jossie A; Heemskerk, Suzanne; Hempenius, Rixta A; Lina, Ben A R; Krul, Cyrille A M; Koeman, Jan H; Speijers, Gerrit J A

2009-12-21

72

Rayleigh guide star AO demonstrator for the 4.2m William Herschel Telescope  

Microsoft Academic Search

An experimental Adaptive Optics system utilizing a low-altitude Rayleigh Laser Guide Star is presented. The current status of the project is described together with plans for future work, with the ultimate goal of providing demonstration Rayleigh LGS AO science on the 4.2m William Herschel Telescope. The implementation of the demonstration system is described in detail as are the technical challenges

Paul Clark; Nirmal Bissonauth; John W. O'Byrne; Colin N. Dunlop; Thomas Gregory; Timothy J. Morris; Richard M. Myers; Christopher D. Saunter; Richard W. Wilson

2003-01-01

73

Lateral fixation of open AO type-B2 ankle fractures: the Knowles pin versus plate  

Microsoft Academic Search

Forty-seven patients with open lateral malleolar (AO type-B2) fractures treated with copious irrigation and radical debridement,\\u000a reduction, and immediate fixation by Knowles pins or lateral plates were retrospectively reviewed with an average follow-up\\u000a period of 29 months. The 47 patients were divided into two groups, based on the method of treatment. The Knowles pin group\\u000a included 25 patients. The plate group

Yih-Shiunn Lee; Shu-Wen Chen

2009-01-01

74

AO3D: A Monte Carlo code for modeling of environmental light propagation  

Microsoft Academic Search

A Monte Carlo radiative transfer program (Atmosphere–Ocean 3-Dimensional, AO3D) for modeling the coupled atmosphere–ocean environment has been developed. The code allows for the specification of optical properties for the atmosphere, land and ocean. Light rays are tracked as they pass between the atmosphere and the ocean, reflect off the ocean surface, the ocean floor, and off land, or are absorbed.

David E. Bates; John N. Porter

2008-01-01

75

Intensity of climate variability derived from the satellite and MERRA reanalysis temperatures: AO, ENSO, and QBO  

NASA Astrophysics Data System (ADS)

Satellite measurements (Atmospheric InfraRed Sounder/Advanced Microwave Sounding Unit-A, MODerate resolution Imaging Spectroradiometer) and the Modern Era Retrospective-analysis for Research and Applications (MERRA) reanalysis have been utilized to analyze the relative influence of the climate variability (AO: Arctic Oscillation, ENSO: El Niño-Southern Oscillation, QBO: Quasi-Biennial Oscillation) on the zonal-mean temperature and wind variations over the globe from September 2002 to August 2011. We also extended the usage of MERRA data for the period of 1979-2011; furthermore, three climate indices of AO, NINO3.4, and QBO were used as the corresponding climate indicators. The correlations between the temperature anomalies and the climate indices indicate that the tropospheric temperature variability in the mid-latitude (30-60N) linked to both AO and ENSO has been more pronounced over ocean than over land. However, the low stratospheric temperature variability in the mid-latitude is mainly associated with ENSO and QBO. The north-south symmetric patterns over the globe are seen in the wind anomaly distributions for ENSO and QBO, but not for AO. The ENSO events are globally vigorous but also localized during the recent 9 years compared with those based on the period of 1979-2011. The tropospheric warming and stratospheric cooling phenomena during this period are more remarkable in the recent 9 years, although according to IPCC (2012). their linkage to the ENSO variability is still uncertain. The ENSO is found to have more significant impact on the tropospheric and low stratosphere temperature variability over the tropics in the recent period, consistent with more active zonal wind meridional circulations. The discrepancies between satellite observations and MERRA are also discussed. The estimated relative impact of the three major concurrent large-scale climate phenomena on regional temperature variability can be of great use in its long-term predictability.

Yoo, Jung-Moon; Won, Young-In; Jeong, Myeong-Jae; Kim, Kyu-Myong; Shin, Dong-Bin; Lee, Yu-Ri; Cho, Young-Jun

2013-04-01

76

An improved model with bending of laser beam for satellite-to-ground AO laser communication  

Microsoft Academic Search

Correcting scintillation for a slant path with adaptive optics (AO) has been studied. However, the models for solving this problem are all to treat the ray track as a straight line. Based on the engineering practical environment, in a low-earth-orbit (LEO) satellite-to-ground laser communication link, the properties of laser beam bending in the slant path will be studied in this

Jian Rong; Fang Li; Xiao-chun Zhong; Xue-ke Ding; Guan Gui

2007-01-01

77

Building portfolios of stocks in the S\\\\~ao Paulo Stock Exchange using Random Matrix Theory  

Microsoft Academic Search

Using Random Matrix Theory, we build a covariance matrix between stocks of the BM&F-Bovespa (Bolsa de Valores, Mercadorias e Futuros de S\\\\~ao Paulo) which is cleaned of some of the noise due to the complex interactions between the many stocks and the finiteness of available data, and use a regression model in order to remove the market effect due to

Leonidas Sandoval Junior; Adriana Bruscato

2012-01-01

78

LGS AO at W.M. Keck Observatory: routine operations and remaining challenges  

Microsoft Academic Search

The Laser Guide Star Adaptive Optics (LGS AO) at the W.M. Keck Observatory is the first system of its kind being used to conduct routine science on a ten-meter telescope. In 2005, more than fifty nights of LGSAO science and engineering were carried out using the NIRC2 and OSIRIS science instruments. In this paper, we report on the typical performance

David Le Mignant; Marcos A. van Dam; Antonin H. Bouchez; Jason C. Y. Chin; Elizabeth Chock; Randall D. Campbell; Al Conrad; Steve Doyle; Robert W. Goodrich; Erik M. Johansson; Shui H. Kwok; Robert E. Lafon; James E. Lyke; Christine Melcher; Ronald P. Mouser; Douglas M. Summers; Paul J. Stomski Jr.; Cynthia Wilburn; Peter L. Wizinowich

2006-01-01

79

Getting Lucky with Adaptive Optics: Fast AO Image Selection in the Visible with a Large Telescope  

Microsoft Academic Search

We describe the results from a new instrument which combines Lucky Imaging\\u000aand Adaptive Optics to give the first routine direct diffraction-limited\\u000aimaging in the visible on a 5m telescope. With fast image selection behind the\\u000aPalomar AO system we obtained Strehl ratios of 5-20% at 700 nm in a typical\\u000arange of seeing conditions, with a median Strehl of

N. M. Law; C. D. Mackay; R. G. Dekany; M. Ireland; J. P. Lloyd; A. M. Moore; J. G. Robertson; P. Tuthill; H. Woodruff

2008-01-01

80

Prelase AO mode-locked Cr:LiSAF laser pumped by flashlamp  

Microsoft Academic Search

In this paper, we report the properties of flashlamp-pumped Cr:LiSAF laser operating both in Q-switched and modelocked modes. Stable Q-switched pulse with energy of 85 mj and pulse duration of 50 ns (FWHM) is obtained. Reliable ps pulse train is observed by prelase A-O modelocking and the pulse duration is 80 ps (FWHM). Wavelength tuning is realized from 810 nm

Zhenlin Wang; Aihua Wang; Qiang Guo; Jin Wang; Peilin Wang

1996-01-01

81

Biodegradation of bisphenol A by cells and cell lysate from Sphingomonas sp. strain AO1  

Microsoft Academic Search

The capacity and pathway of bisphenol A [BPA; 2,2-bis(4-hydroxyphenyl)propane] degradation in Sphingomonassp. strain AO1, which was isolated from the soil of a vegetable-growing field in Japan, were investigated. The bacterial strain was able to grow in a basal mineral salt medium containing BPA as the sole carbon source (BSMB medium), and was able to degrade 115 µ g?ml-1 BPA in

Miho Sasaki; Jun-ichi Maki; Ko-ichi Oshiman; Yoshinobu Matsumura; Tetsuaki Tsuchido

2005-01-01

82

OCam with CCD220, the Fastest and Most Sensitive Camera to Date for AO Wavefront Sensing  

Microsoft Academic Search

For the first time, subelectron readout noise has been achieved with a camera dedicated to astronomical wavefront-sensing applications. The OCam system demonstrated this performance at a 1300 Hz frame rate and with 240 × 240 pixel frame size. ESO and JRA2 OPTICON jointly funded e2v Technologies to develop a custom CCD for adaptive optics (AO) wavefront-sensing applications. The device, called

Philippe Feautrier; Jean-Luc Gach; Philippe Balard; Christian Guillaume; Mark Downing; Norbert Hubin; Eric Stadler; Yves Magnard; Michael Skegg; Mark Robbins; Sandy Denney; Wolfgang Suske; Paul Jorden; Patrick Wheeler; Peter Pool; Ray Bell; David Burt; Ian Davies; Javier Reyes; Manfred Meyer; Dietrich Baade; Markus Kasper; Robin Arsenault; Thierry Fusco; José Javier Diaz Garcia

2011-01-01

83

The L3Vision CCD220 with its OCam test camera for AO applications in Europe  

Microsoft Academic Search

ESO and JRA2 OPTICON have jointly funded e2v technologies to develop a custom CCD for Adaptive Optic Wave Front Sensor (AO WFS) applications. The device, called CCD220, is a compact Peltier-cooled 240×240 pixel frametransfer 8-output back-illuminated sensor. Using the electron-multiplying technology of L3Vision detectors, the device is designed to achieve sub-electron read noise at frame rates from 25 Hz to

Philippe Feautrier; Jean-Luc Gach; Philippe Balard; Christian Guillaume; Mark Downing; Eric Stadler; Yves Magnard; Sandy Denney; Wolfgang Suske; Paul Jorden; Patrick Wheeler; Michael Skegg; Peter Pool; Ray Bell; David Burt; Javier Reyes; Manfred Meyer; Norbert Hubin; Dietrich Baade; Markus Kasper; Robin Arsenault; Thierry Fusco; Jose Javier Diaz Garcia

2008-01-01

84

Isolation and characterization of a novel bacterium, Sphingomonas bisphenolicum strain AO1, that degrades bisphenol A  

Microsoft Academic Search

Bisphenol A (2,2-bis(4-hydroxyphenyl) propane, BPA), which is used as a synthetic resin material or a plasticizer, is a pollutant\\u000a that?possesses endocrine-disrupting activity. Bioremediation of BPA is used to decrease its polluting effects, and here we\\u000a report a novel bacterial strain AO1, which is able to degrade BPA. This strain was isolated using enrichment cultivation from\\u000a a soil sample from a

Ko-ichi Oshiman; Yuji Tsutsumi; Tomoaki Nishida; Yoshinobu Matsumura

2007-01-01

85

PHOTOMETRIC EVOLUTION OF SNe Ib/c 2004ao, 2004gk, AND 2006gi  

SciTech Connect

Photometric observations of three core collapse supernovae (SNe 2004ao, 2004gk, and 2006gi), covering about 200 days of evolution, are presented and analyzed. The photometric behavior of the three objects is consistent with their membership in the envelope-stripped Type Ib/c class. Pseudobolometric light curves are constructed. The corresponding measured e-folding times are found to be faster compared to the {sup 56}Co decay (i.e., 111.3 days), suggesting that a proportion of {gamma}-rays increasing with time have escaped without thermalization, owing to the low-mass nature of the ejecta. SN 2006gi has almost identical post-maximum decline phase luminosities as SN 1999ex and found to be similar to both SNe 1999dn and 1999ex in terms of the quasi-bolometric shape, placing it among the fast decliner Ib objects. SN 2004ao appears to fit within the slow decliner Ib SNe. SNe 2004ao and 2004gk display almost identical luminosities in the [50-100] day time interval, similar to SN 1993J. A preliminary simplified {gamma}-ray deposition model is described and applied to the computed pseudobolometric light curves, allowing one to find a range in the ejecta and {sup 56}Ni masses. The optical and quasi-bolometric light curves and the B - V color evolution of SN 2004gk are found to show a sudden drop after day 150. Correlating this fact to dust formation is premature and requires further observational evidence.

Elmhamdi, Abouazza; Kordi, Ayman [Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451 (Saudi Arabia); Tsvetkov, Dmitry [Sternberg Astronomical Institute, University Ave. 13, 119992 Moscow (Russian Federation); Danziger, I. John [INAF, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34131 Trieste (Italy)

2011-04-20

86

Testing the limits of AO: near diffraction limited astronomy in the red optical  

NASA Astrophysics Data System (ADS)

In this presentation I explore selected science cases that benefit from the increased spatial resolution and sensitivity delivered by advanced, e.g. tomographic and multi conjugate, adaptive optics assisted observations at ELTs. In particular I will show that near diffraction-limited spatial resolution can be achieved at red optical wavelengths, even in the low Strehl (˜5%) regime. A typical AO-PSF has a diffraction limited core sumperimposed on the seeing halo. At 8m telescopes, the AO PSF for a 5% Strehl ratio would have a very low intensity diffraction limited core on top of the seeing halo, however, at an ELT because of the 4-5 times higher angular resolution, the diffraction limited core stands more prominently atop the shallow seeing halo as the halo flux per resolution element is smaller by a factor of 16-25. I focus on prominent example science cases that use the Calcium triplet and thus exploit this gain in spatial resolution in the red-optical: stellar populations in dense environments or crowded fields; and the case of intermediate mass black holes in nuclear and globular stellar clusters as well as (super-) massive black holes in galaxies. Additionally, kinematic studies of intermediate to high-redshift galaxies benefit from the increased spatial resolution in the red-optical. I will show that well measured AO-PSFs are a necessary ingredient for the successful analysis and interpretation of diffraction limited data

Tecza, M.

2011-09-01

87

One-month lead predictability of the wintertime AO using a realistic initial solar constant for a CGCM  

NASA Astrophysics Data System (ADS)

Recently, anomalous warm events and cold surges have been increasing rapidly during the boreal winter. Many investigations reported that these anomalous temperature variations are closely related with the large-scale disturbance associated with the Arctic Oscillation (AO), thus implying the importance of the AO forecasting during the season. According to previous studies, the AO is caused by various reasons such as the variations of tropical and subtropical sea surface temperature, snow cover and solar activity. This study investigates the impact of solar constant variation on the predictability of the AO in terms of one-month lead predictability of boreal winter season (DJF) AO using Pusan National University (PNU) CGCM, a participant model of APEC Climate Center (APCC) Multi Model Ensemble Seasonal Prediction System. The one-month lead hindcasts produced from a realistic initial solar constant experiment (Solar Run, SR) and from a climatological solar constant experiment (Control run, CR) are comparatively analyzed. The one-month lead hindcasts were initiated from mid-November, -December and -January of each year for the period 1980~2009. The hindcast of SR showed better skill than that of CR in terms of forecasting not only the AO index but also the atmospheric circulation pattern related with AO. The significantly improved AO forecast skill in SR resulted from the enhanced daily forecast skill of polar vortex by the SR. That is, a more realistic atmospheric response in the upper level to the realistically varying initial solar constant affected all levels of the atmosphere via stratosphere-troposphere coupling, thereby improving the AO forecast. It is worth noting that the model can raise the predictability of the AO forecast by imposing a realistic solar constant as the initial condition. Acknowledgments This work was funded by "The Korea Meteorological Administration Research and Development Program under Grant CATER 2012-3083" of South Korea.

Ahn, Joong-Bae; Kim, Hae-Jeong

2013-04-01

88

Compilação de dados atômicos e moleculares do UV ao IV próximo para uso em síntese espectral  

NASA Astrophysics Data System (ADS)

Espectros sintéticos são utéis em uma grande variedade de aplicações, desde análise de abundâncias em espectros estelares de alta resolução ao estudo de populações estelares em espectros integrados. A confiabilidade de um espectro sintético depende do modelo de atmosfera adotado, do código de formação de linhas e da qualidade dos dados atômicos e moleculares que são determinantes no cálculo das opacidades da fotosfera. O nosso grupo no departamento de Astronomia no IAG tem utilizado espectros sintéticos há mais de 15 anos, em aplicações voltadas principalmente para a análise de abundâncias de estrelas G, K e M e populações estelares velhas. Ao longo desse tempo, as listas de linhas vieram sendo construídas e atualizadas continuamente, e alguns acréscimos recentes podem ser citados: Castilho (1999, átomos e moléculas no UV), Schiavon (1998, bandas moleculares de TiO) e Melendez (2001, átomos e moléculas no IV próximo). Com o intuito de calcular uma grade de espectros do UV ao IV próximo para uso no estudo de populações estelares velhas, se fazia necessário compilar e homogeneizar as diversas listas em apenas uma lista atômica e uma molecular. Nesse processo, a nova lista compilada foi correlacionada com outras bases de dados (NIST, Kurucz Database, O' Brian et al. 1991) para atualização dos parâmetros que caracterizam a transição atômica (comprimento de onda, log gf e potencial de excitação). Adicionalmente as constantes de interação C6 foram calculadas segundo a teoria de Anstee & O'Mara (1995) e artigos posteriores. As bandas moleculares de CH e CN foram recalculadas com o programa LIFBASE (Luque & Crosley 1999). Nesse poster estão detalhados os procedimentos citados acima, as comparações entre espectros calculados com as novas listas e espectros observados em alta resolução do Sol e de Arcturus, e uma análise do impacto decorrente da utilização de diferentes modelos de atmosfera no espectro sintético. Ao final, temos uma lista de linhas atômicas com mais de 24.000 linhas e uma lista molecular com as moléculas CN, CH, OH, NH, MgH, C2, TiO Gama, CO, FeH, adequadas ao estudo de estrelas G, K e M e populações estelares velhas.

Coelho, P.; Barbuy, B.; Melendez, J.; Allen, D. M.; Castilho, B.

2003-08-01

89

Scythe regulates apoptosis through modulating ubiquitin-mediated proteolysis of the Xenopus elongation factor XEF1AO  

PubMed Central

Scythe was originally identified as a novel Reaper-binding anti-apoptotic protein, although the mechanisms of its functions remain largely obscure. Our previous analysis revealed that Scythe can bind to a proteasomal subunit via N-terminal domains and that the domains are required for appropriate development of Xenopus embryos. In the present study, we show evidence that the N-terminus of Scythe interacts with XEF1AO, a maternal form of Xenopus laevis EF1A that was suggested to be a potential inducer of apoptosis in vertebrates, and that the binding enhances the poly-ubiquitin modification and subsequent degradation of XEF1AO. Scythe is required for degradation of XEF1AO, since immunodepletion of Scythe from embryonic extracts stabilized XEF1AO significantly. Furthermore, we show that apoptosis induced by accumulation of XEF1AO can be suppressed by co-expression of the full-length form of Scythe. These observations indicate that the proteolytic regulation of XEF1AO, mediated through Scythe, is essential to prevent inappropriate accumulation of XEF1AO and resulting apoptotic events during the course of Xenopus development.

Minami, Ryosuke; Shimada, Masumi; Yokosawa, Hideyoshi; Kawahara, Hiroyuki

2007-01-01

90

Determinação de regiões de órbitas diretas estáveis ao redor da Lua  

NASA Astrophysics Data System (ADS)

Neste Trabalho estamos investigando regiões do sistema Terra-Lua que contêm órbitas diretas estáveis ao redor da Lua visando a utilização destas órbitas em futuras missões de veículos espaciais como alternativas de trajetórias com baixo custo de manutenção. Adotando-se o problema restrito de três corpos, Terra-Lua-partícula, a localização e a extensão destas regiões de estabilidade foram investigadas numericamente considerando como estável toda órbita que permanece ao redor a Lua por, no mínimo, 1000 dias com energia de dois corpos da partícula em relação à Lua negativa. A estabilidade de tais regiões está associada a duas famílias de órbitas periódicas simples H1 e H2 e a órbitas quase-periódicas associadas a elas. Uma vez identificadas as regiões de estabilidade passamos a analisá-las introduzindo, paulatinamente, outras interações relevantes ao sistema como as perturbações do Sol (via problema restrito de quatro corpos), das marés, da pressão de radiação e do achatamento terrestre. Os resultados encontrados até o momento mostram que a perturbação do Sol é a única que reduz significativamente o tamanho das regiões de estabilidade. Também estamos investigando o comportamento de tais regiões quando características intrínsecas do sistema como as excentricidades das órbitas da Terra e da Lua e a inclinação da órbita Lua são consideradas. Com este estudo estamos reunindo informações que nos permitirão compreender a evolução das regiões de estabilidade no sistema Terra-Lua, bem como estabelecer parâmetros adequados para a utilização das trajetórias estáveis em futuras missões espaciais. Agradecimentos: Este projeto conta com o apoio do CNPq, da Capes e da Fapesp.

de Melo, C. F.; Winter, O. C.; Vieira Neto, E.

2003-08-01

91

Optimization of an AO Q-switched solid-state Raman laser  

NASA Astrophysics Data System (ADS)

An extension of the rate equation models for solid-state Raman laser is proposed and investigated with accounting for the dynamics of an acousto-optically (AO) Q-switch modulator and the effects of thermal lens provided by the pump beam. The improved model is aimed at outlining optimization strategies for wonderful laser performance with short pulse width and high peak power. A comparison between traditional intra-cavity and new couple-cavity configurations is made. The simulation results indicate that it is possible to realize an efficient sub-nanosecond coupled-cavity Raman laser by optimizing several important parameters.

Zhu, Feihu; Gong, Ke; Huo, Yujing

2012-04-01

92

Interphalangeal joint arthrodesis with oblique placement of an AO lag screw.  

PubMed

A damaged interphalangeal (IP) joint may be treated by fusion. Arthrodesis should leave the joint at the most functional angle and give sound bony union in the shortest possible time, maintaining maximum proximal and distal joint motion. The lateral oblique placement of a single AO lag screw, proximal to distal, achieves these aims. This method gives sufficient proximal bone for screw purchase and better control of the desired angle of fusion. This technique has led to fusion in 22 of 23 joints (96%), taking an average of 8.2 weeks. PMID:8014552

Teoh, L C; Yeo, S J; Singh, I

1994-04-01

93

Gymnothelignans A-O: conformation and absolute configuration analyses of lignans bearing tetrahydrofuran from Gymnotheca chinensis.  

PubMed

Fifteen new lignans, gymnothelignans A-O (1-15), bearing tetrahydrofuran with variable conformations belonging to three potentially related skeletons were isolated from Gymnotheca chinensis Decne. The structures were elucidated by means of detailed spectroscopic analysis. Absolute configurations were assigned using X-ray single-crystal diffraction and chemical transformations. Moreover, by the homology, compounds 1-11 and eupomatilones were confirmed to have uniform R-configuration at C-5. However, a synthesized congener has long been mistaken as 5-epimer of eupomatilone-6. This work provides guidance for the absolute configuration establishment of the subeupomatilone family with trans-H-4-H-5 configuration. PMID:22946788

He, Dahai; Ding, Lisheng; Xu, Hongxi; Lei, Xinxiang; Xiao, Hongping; Zhou, Yan

2012-09-19

94

Prelase A-O mode-locked Cr:LiSAF laser pumped by flashlamp  

NASA Astrophysics Data System (ADS)

In this paper, we report the properties of flashlamp-pumped Cr:LiSAF laser operating both in Q-switched and modelocked modes. Stable Q-switched pulse with energy of 85 mj and pulse duration of 50 ns (FWHM) is obtained. Reliable ps pulse train is observed by prelase A-O modelocking and the pulse duration is 80 ps (FWHM). Wavelength tuning is realized from 810 nm to 890 nm by a two-plate crystal quartz birefringent filter (BRF, d1:d2 equals 0.5:1).

Wang, Zhenlin; Wang, Aihua; Guo, Qiang; Wang, Jin; Wang, Peilin

1996-09-01

95

Cavitation Performance of a Propeller Design for a Naval Auxiliary Oiler (AO 177) (Model 5326 with Design Propeller 4645).  

National Technical Information Service (NTIS)

Cavitation experiments were performed on a model propeller designed for (AO 177). The results showed satisfactory performance concerning power loss; However, a potential problem with erosion is predicted based on these results. Additional erosion studies ...

K. Remmers N. A. McDonald R. Hecker

1974-01-01

96

Tc-99m complexes of new functionalized propylene amine oxime (PnAO) ligands  

SciTech Connect

Three new functionalized PnAO ligands, 3,3,9,9-tetra-methyl-6-R-4, 8-diazaundecane-2,10-dionedioxime (R=benzyl, p-nitrobenzyl and p-aminobenzyl) were synthesised. Tc-99m complexes of these ligands were prepared by direct reduction of Tc-99m O{sub 4}{sup -} using stannous tartrate in the presence of ligands at pH 9.0. Complexation yields were greater than 95% at 1h and 24h post preparation as assessed by ITLC, HPLC and extraction into CHCl3. All three of the complexes were neutral and lipophilic (logP > 2.0) and eluted as single peak from a RP HPLC column. Biodistribution studies of the Tc-99m complexes of the benzyl and the nitrobenzyl derivatives were done in Wistar rats. Both complexes showed brain uptake but were washed out of the brain similar to the behavior of Tc-99m PnAO.

Pillai, M.R.A.; Kothari, K.; Ramamoorthy, N. [Univ. of Missouri, Columbia, MO (United States)] [and others

1994-05-01

97

Instrument control software development process for the multi-star AO system ARGOS  

NASA Astrophysics Data System (ADS)

The ARGOS project (Advanced Rayleigh guided Ground layer adaptive Optics System) will upgrade the Large Binocular Telescope (LBT) with an AO System consisting of six Rayleigh laser guide stars. This adaptive optics system integrates several control loops and many different components like lasers, calibration swing arms and slope computers that are dispersed throughout the telescope. The purpose of the instrument control software (ICS) is running this AO system and providing convenient client interfaces to the instruments and the control loops. The challenges for the ARGOS ICS are the development of a distributed and safety-critical software system with no defects in a short time, the creation of huge and complex software programs with a maintainable code base, the delivery of software components with the desired functionality and the support of geographically distributed project partners. To tackle these difficult tasks, the ARGOS software engineers reuse existing software like the novel middleware from LINC-NIRVANA, an instrument for the LBT, provide many tests at different functional levels like unit tests and regression tests, agree about code and architecture style and deliver software incrementally while closely collaborating with the project partners. Many ARGOS ICS components are already successfully in use in the laboratories for testing ARGOS control loops.

Kulas, M.; Barl, L.; Borelli, J. L.; Gässler, W.; Rabien, S.

2012-09-01

98

Lateral fixation of AO type-B2 ankle fractures: the Acutrak plus compression screw technique  

PubMed Central

The Acutrak plus compression screw (APCS) (Acumed Inc., Beaverton, OR, USA) is an intramedullary implant which can achieve stable fixation with minimum soft tissue dissection. The characteristics of the APCS include fully-threaded length, headless, cannulated, and variable thread pitch. Twenty-three patients with AO type-B2 ankle fractures treated with lateral fixation by an APCS were retrospectively reviewed. Evaluation of postoperative roentgenograms for adequacy of reduction revealed a good reduction in 22 of 23 (95.7%) patients. The average wound incision was 4.1 cm. The operative time was 25.3 minutes. All the ankle fractures showed radiographic evidence of healing within four months. At the final follow-up, the ankle scores of the patients were evaluated for functional outcomes. Good to excellent results were obtained in 21 (91.3%) patients. No patient complained of symptomatic hardware. In conclusion, lateral fixation of AO type-B2 ankle fractures by APCS offers several advantages including stable fixation, a small surgical wound, less dissection of soft tissue, no palpable hardware, and easy application with a short operating time.

Lee, Yih-Shiunn; Huang, Chien-Rae; Chen, Shih-Hao

2010-01-01

99

OCam with CCD220, the Fastest and Most Sensitive Camera to Date for AO Wavefront Sensing  

NASA Astrophysics Data System (ADS)

For the first time, subelectron readout noise has been achieved with a camera dedicated to astronomical wavefront-sensing applications. The OCam system demonstrated this performance at a 1300 Hz frame rate and with 240 × 240 pixel frame size. ESO and JRA2 OPTICON jointly funded e2v Technologies to develop a custom CCD for adaptive optics (AO) wavefront-sensing applications. The device, called CCD220, is a compact Peltier-cooled 240 × 240 pixel frame-transfer eight-output back-illuminated sensor using the EMCCD technology. This article demonstrates, for the first time, subelectron readout noise at frame rates from 25 Hz to 1300 Hz and dark current lower than 0.01 e- pixel-1 frame-1 . It reports on the quantitative performance characterization of OCam and the CCD220, including readout noise, dark current, multiplication gain, quantum efficiency, and charge transfer efficiency. OCam includes a low-noise preamplifier stage, a digital board to generate the clocks, and a microcontroller. The data acquisition system includes a user-friendly timer file editor to generate any type of clocking scheme. A second version of OCam, called OCam2 , has been designed to offer enhanced performance, a completely sealed camera package, and an additional Peltier stage to facilitate operation on a telescope or environmentally challenging applications. New features of OCam2 are presented in this article. This instrumental development will strongly impact the performance of the most advanced AO systems to come.

Feautrier, Philippe; Gach, Jean-Luc; Balard, Philippe; Guillaume, Christian; Downing, Mark; Hubin, Norbert; Stadler, Eric; Magnard, Yves; Skegg, Michael; Robbins, Mark; Denney, Sandy; Suske, Wolfgang; Jorden, Paul; Wheeler, Patrick; Pool, Peter; Bell, Ray; Burt, David; Davies, Ian; Reyes, Javier; Meyer, Manfred; Baade, Dietrich; Kasper, Markus; Arsenault, Robin; Fusco, Thierry; Diaz Garcia, José Javier

2011-03-01

100

The COWL pattern identified with a large AO index and its impact on annular surface temperature anomalies  

NASA Astrophysics Data System (ADS)

In this study, the cold ocean/warm land (COWL) pattern was identified from the leading empirical orthogonal function (EOF) of the monthly 1000-hPa geopotential height field poleward of 20°N. Traditionally, the leading EOF has been recognized as the Arctic Oscillation (AO), or Northern Annular Mode (NAM), which causes annular surface air temperature (SAT) anomalies over high-latitude regions of the Northern Hemisphere. A new finding of the present study is that the total AO events defined by the large AO index actually include a distinct type of events that are characterized by a less-annular spatial structure, i.e., the COWL pattern, which shows an NAO-like distribution in the Atlantic sector and a center of action over the North Pacific with the same sign as that over the Arctic. In addition, unlike canonical AO events, the COWL events also show a less-annular pattern in the stratosphere. Statistically, at least one-third of the AO events can be categorized as the COWL events. The SAT anomalies associated with the COWL pattern have an annular distribution over the high-latitude region of the two continents in the Northern Hemisphere. In contrast, if the COWL events are removed from the total AO events, the remainder shows less annular SAT anomalies. Thus, the typical annular SAT anomalies associated with AO events are in large part due to the contribution of the COWL pattern. Furthermore, the monthly variability and the interannual variability of all the AO events are equally important.

Shi, Ning; Bueh, Cholaw

2012-08-01

101

A decadal survey of AO wavefront sensing detector developments in Europe  

NASA Astrophysics Data System (ADS)

The success of the next generation of instruments for 8 to 40-m class telescopes will depend on the ability of Adaptive Optics (AO) systems to provide excellent image quality and stability. This will be achieved by increasing the sampling, wavelength range and correction quality of the wave front error in both spatial and time domains. The modern generation of AO wavefront sensor detectors started in the late nineties with the development of the CCD50 detector by e2v under ESO contract for the ESO NAOS AO system. With a 128x128 pixels format, this 8 outputs CCD runs at a 500 Hz frame rate with a readout noise of 7e-. A major breakthrough has been achieved with the recent development of the CCD220, also by e2v technologies. This 240x240 pixels 8 outputs EMCCD (CCD with internal multiplication), also developed by e2v, has been jointly funded by ESO and Europe under the FP6 programme. The CCD220 detector and the OCAM2 camera are now the most sensitive system in the world for advanced adaptive optics systems, offering an astonishing <0.2 e readout noise at a frame rate of 1500 Hz with negligible dark current. Extremely easy to operate, OCAM2 only needs a 24 V power supply and a modest water cooling circuit. This system is extensively described elsewhere in this conference (see Gach J-L. et al). An upgrade of OCAM2 is foreseen to boost its frame rate to 2500 Hz, opening the window of XAO wavefront sensing for the ELT. Since this major success, new developments started in Europe. One is fully dedicated to Laser Guide Star AO for the ELT. The spot elongation from a LGS SH wavefront sensor induces an increase of the pixel format. Two detectors are currently developed by e2v. The NGSD will be a 672x672 pixels CMOS detector with a readout noise of 4e (goal 1e) at 700 Hz frame rate. The LGSD is a scaling of the NGSD with 1680x1680 pixels and 3 e readout noise (goal 1e) at 700 Hz frame rate. New technologies will be developed for that purpose: new CMOS pixel architecture, CMOS back thinned and back illuminated device, full digital outputs. In addition, the CMOS technology is extremely robust in a telescope environment. Both detectors will be used on the ELT, depending on the AO system considered. Additional developments also started for wavefront sensing in the infrared based on new breakthrough in Avalanche Photodiode (APD) arrays. A 256x256 array is currently developed by ESO and Selex while a similar development started in France with the RAPID project. The latter should offer a 320x240 8 outputs 30 microns IR array, sensitive from 0.4 to 3.2 microns, with 2 e readout noise at 1500 Hz frame rate.

Feautrier, Philippe

2011-09-01

102

Extreme adaptive optics in the mid-IR: The METIS AO system  

NASA Astrophysics Data System (ADS)

METIS, the Mid-infrared ELT Imager and Spectrograph, is currently in its phase A study as one of the candidate first-light instruments for the European Extremely Large Telescope. METIS will feature several observational modes, ranging from diffraction limited imaging in L, M and N-bands to high-resolution Integral Field spectroscopy for the L and M-bands. METIS in its current design gives sensitivities similar to Spitzer in imaging and low-resolution spectroscopy and with its high-resolution spectrograph will provide unprecedented line sensitivity. The design of METIS is optimized for both galactic science cases (e.g. conditions in the early solar system, formation and evolution of proto-planetary disks and properties of exoplanets) and extragalactic science cases (e.g. the growth of Supermassive Black Holes). METIS will require a high-order adaptive optics (AO) system to meet its scientific goals, both to provide correction for atmospheric turbulence as well as reduce the impact of wind shake, leading to a residual image motion of 3 - 5 mas rms. METIS is expected to feature both an internal Single Conjugate AO system as well as an external Laser Tomography AO system. The challenges for the METIS AO system are mainly in the broad correction range, an excellent image stability required for coronagraphy and in providing a high sky coverage to be available for as many science targets as possible. An additional challenge for METIS is the need to compensate for composition turbulence, mainly in the form of fast fluctuations in water vapor concentration. Water vapor fluctuations impact the performance of METIS in several ways: Atmospheric dispersion causes a broadening of the point-spread function, both in the science channel and the wavefront channel, but can be corrected using a Atmospheric Dispersion Corrector. Variations in the water vapor composition cannot be corrected this way and are currently estimated to give a residual image motion of ?10 mas rms. This effect can, especially for coronagraphy, not be neglected. Chromatic optical path difference errors, caused by changes in the index of refraction along the path through the atmosphere were found to be negligible in the case of METIS due to attenuation by the outer scale (at typical values of 25 m). Chromatic anisoplanatism is the effect that the light at different wavelengths travels through a slightly different light path through the atmosphere and can be-at least partly-corrected. The last effect is composition turbulence, mainly caused by fast (> 1 Hz) fluctuations in the water vapor content. Based on data for ALMA and radiometer probes, this leads to a maximum loss in Strehl ratio between 5 and 10%. This mainly has an impact on coronagraphy and the METIS AO team is actively investigating ways to compensate also water vapor turbulence. The main challenge is currently obtaining reliable data on the distribution and magnitude of precipitable water vapor fluctuations.

Stuik, Remko; Jolissaint, Laurent; Kendrew, Sarah; Hippler, Stefan; Brandl, Bernhard

2010-11-01

103

Herschel Observations of Blazars PKS 1510-089 and AO 0235+164  

NASA Astrophysics Data System (ADS)

We present the results of the Herschel Space Observatory observations of two blazars - PKS 1510-089 and AO 0235+164. Observations were performed in 2011 and 2012, involving two photometric instruments - PACS and SPIRE, covering the wavelength range of 70-500 ?m. Each source was observed quasi-simultaneously with both instruments over 10 epochs. We were able to constrain the spectral peaks of the synchrotron components for both sources. We detected little spectral variability in the far-IR band for either source. For PKS 1510-089, we collected multiwavelength data from Fermi LAT, Swift XRT and UVOT, SMARTS and SMA. Multiwavelength variability characteristics and the results of the SED modeling indicate that two separate emitting regions, located at different distances in the relativistic jet, contribute to the observed emission.

Nalewajko, Krzysztof; Sikora, M.; Madejski, G. M.; Exter, K.; Szostek, A.; Szczerba, R.; Kidger, M. R.; Lorente, R.

2013-04-01

104

The relationship between snowpack dynamics and NAO/AO indices in SW Spitsbergen  

NASA Astrophysics Data System (ADS)

This paper shows that maximum snow depth and the length of accumulation and ablation periods observed at the local scale of Hornsund, SW Spitsbergen, are partly explained by monthly and seasonal values of the AO and NAO indices in the given and previous hydrological years. This analysis is followed by an application of a statistically efficient lumped parameter time series approach to modelling the dynamics of snow depth, based on daily meteorological and snow depth measurements from the same area. A dynamic Stochastic Transfer Function (STF) model is developed that follows the Data Based Mechanistic approach, where a stochastic data-based identification of model structure and an estimation of its parameters are followed by a physical interpretation. Apart from snow depth estimates, the model provides also the uncertainty limits. An analysis of the variation in parameter estimates over the whole measurement period provides an insight into the possible influence of recent climate change on snow cover dynamics at Hornsund. To help explain the physical meaning of the model parameters, we classified the data into accumulation and ablation periods. The models were run for each period separately. The first order model structure was found to be the most suitable to explain the variability of the snow cover. The cross-validation of models performance on the other years shows that the predictive value of the obtained models is not very consistent, with a mixture of good and bad years. The analysis shows that variability in the NAO and AO indices, reflecting the changes in global circulation patterns, is reproduced by local, physically meaningful, STF model-derived parameters in the form of residence times and temperature and precipitation related gains.

Luks, Bart?omiej; Osuch, Marzena; Romanowicz, Renata J.

105

FlyEyes: A CCD-based Wavefront Sensor for PUEO, the CFHT Curvature AO System  

NASA Astrophysics Data System (ADS)

Adaptive optics wavefront sensing imposes stringent requirements on detectors, due to the simultaneous need for extremely low read noise and high frame rates. Curvature wavefront sensing measurements are based on the normalized intensity of the signal in a given subaperture, and avalance photodiodes (APDs) have traditionally been used as detectors in curvature systems such as the Canada-France-Hawaii Telescope (CFHT) adaptive optics (AO) bonnette, called PUEO after the endemic Hawaiian owl. Passively quenched APDs are robust but have low QE ( ˜ 40 % ), while actively quenched APDs can have much higher QE, but have been known to fail. Furthermore, curvature systems with large numbers of subapertures are now in operation, and the cost of individual APDs may become prohibitive for such systems. Thus, a CCD-based alternative appears very attractive, and development of a specific chip was initiated at ESO 10 years ago. In this article, we report on the performance of the FlyEyes camera, a project that was conceived to compare the performance of the backside-illuminated custom-designed CCD detector with an array of APDs, used in an operational and well-characterized curvature wavefront AO system. The on-sky performance is demonstrated to be unaffected on bright guide stars (i.e., negligible latency), and although the faint end suffers from the 2.5 e- read noise, the performance can be regained by lowering the frame rate on the wavefront sensor. In this article, we report on results that show that the CCD can be used to replace an array of expensive APDs. This would enable a cost-effective upgrade of PUEO to a higher-order system, as has been proposed at various occasions.

Lai, Olivier; Cuillandre, Jean-Charles; Ho, Kevin K. Y.; Baril, Marc; Benedict, Tom; Ward, Jeff; Thomas, Jim; Salmon, Derrick; Lin, Chueh-Jen; Wang, Shiang-Yu; Luppino, Gerry; Dorn, Reinhold; Puget, Pascal; Burke, Barry; Beletic, James

2011-04-01

106

Goals, Strategies and First Discoveries of AO327, the Arecibo All-sky 327 MHz Drift Pulsar Survey  

NASA Astrophysics Data System (ADS)

We report initial results from AO327, a drift survey for pulsars with the Arecibo telescope at 327 MHz. The first phase of AO327 will cover the sky at declinations of -1° to 28°, excluding the region within 5° of the Galactic plane, where high scattering and dispersion make low-frequency surveys sub-optimal. We record data from a 57 MHz bandwidth with 1024 channels and 125 ?s sampling time. The 60 s transit time through the AO327 beam means that the survey is sensitive to very tight relativistic binaries even with no acceleration searches. To date we have detected 44 known pulsars with periods ranging from 3 ms to 2.21 s and discovered 24 new pulsars. The new discoveries include 3 ms pulsars, three objects with periods of a few tens of milliseconds typical of young as well as mildly recycled pulsars, a nuller, and a rotating radio transient. Five of the new discoveries are in binary systems. The second phase of AO327 will cover the sky at declinations of 28°-38°. We compare the sensitivity and search volume of AO327 to the Green Bank North Celestial Cap survey and the GBT350 drift survey, both of which operate at 350 MHz.

Deneva, J. S.; Stovall, K.; McLaughlin, M. A.; Bates, S. D.; Freire, P. C. C.; Martinez, J. G.; Jenet, F.; Bagchi, M.

2013-09-01

107

Aspergillus oryzae AoSO Is a Novel Component of Stress Granules upon Heat Stress in Filamentous Fungi  

PubMed Central

Stress granules are a type of cytoplasmic messenger ribonucleoprotein (mRNP) granule formed in response to the inhibition of translation initiation, which typically occurs when cells are exposed to stress. Stress granules are conserved in eukaryotes; however, in filamentous fungi, including Aspergillus oryzae, stress granules have not yet been defined. For this reason, here we investigated the formation and localization of stress granules in A. oryzae cells exposed to various stresses using an EGFP fusion protein of AoPab1, a homolog of Saccharomyces cerevisiae Pab1p, as a stress granule marker. Localization analysis showed that AoPab1 was evenly distributed throughout the cytoplasm under normal growth conditions, and accumulated as cytoplasmic foci mainly at the hyphal tip in response to stress. AoSO, a homolog of Neurospora crassa SO, which is necessary for hyphal fusion, colocalized with stress granules in cells exposed to heat stress. The formation of cytoplasmic foci of AoSO was blocked by treatment with cycloheximide, a known inhibitor of stress granule formation. Deletion of the Aoso gene had effects on the formation and localization of stress granules in response to heat stress. Our results suggest that AoSO is a novel component of stress granules specific to filamentous fungi. The authors would specially like to thank Hiroyuki Nakano and Kei Saeki for generously providing experimental and insightful opinions.

Huang, Hsiang-Ting; Maruyama, Jun-ichi; Kitamoto, Katsuhiko

2013-01-01

108

A novel mammalian expression system derived from components coordinating nicotine degradation in arthrobacter nicotinovorans pAO1  

Microsoft Academic Search

ABSTRACT We describe,the design,and detailed characterization of 6-hydroxy-nicotine,(6HNic)-adjustable transgene expression,(NICE) systems,engineered,for lentiviral transduction,and,in vivo modulation,of angiogenic responses.,Arthrobacter,nicotinovorans,pAO1 encodes,a unique,catabolic,machinery,on its plasmid pAO1, which enables this Gram-positive soil bac- terium,to use,the tobacco,alkaloid,nicotine,as the exclusive,carbon,source.,The,6HNic-responsive repressor-operator (HdnoR-ONIC) interaction, control- ling 6HNic oxidase,production,in A.nicotinovorans pAO1, was engineered for generic 6HNic-adjustable transgene,expression,in mammalian,cells. HdnoR fused,to different transactivation,domains,retained its ONIC-binding,capacity,in mammalian,cells and reversibly,adjusted,transgene,transcription,from chi- meric,ONIC-containing,promoters,(PNIC

Laetitia Malphettes; Cornelia C. Weber; Marie Daoud El-Baba; Ronald G. Schoenmakers; Dominique Aubel; Wilfried Weber; Martin Fussenegger

2005-01-01

109

Comparative analysis of the main bioactive components of San-ao decoction and its series of formulations.  

PubMed

A high performance liquid chromatographic (HPLC) method with diode array detection (DAD) was established for simultaneous determination of seven main bioactive components in San-ao decoction and its series of formulae (San-ao decoction, Wu-ao decoction, Qi-ao decoction and Jia-wei San-ao decoction). Seven compounds were analyzed simultaneously with a XTerra C(18) column (4.6 mm × 250 mm, 5 µm) using a linear gradient elution of a mobile phase containing acetonitrile (A) and a buffer solution (0.02 mol/L potassium dihydrogen phosphate and adjusted to pH 3 using phosphoric acid) (B); the flow rate was 1.0 mL/min. The sample was detected with DAD at 210, 254 and 360 nm and the column was maintained at 30 °C. All the compounds showed good linearity (r2 > 0.9984) in the tested concentration range. The precisions were evaluated by intra-day and inter-day tests, and relative standard deviation (R.S.D.) values within the range of 0.83%–2.53% and 0.64%–2.77% were reported, respectively. The recoveries of the quantified compounds were observed to cover a range from 95.34% and 104.82% with R.S.D. values less than 2.72%. The validated method was successfully applied for the simultaneous determination of seven main bioactive components including ephedrine (1), amygdalin (2), liquiritin (3), benzoic acid (4), isoliquiritin (5), formononetin (6) and glycyrrhizic acid (7) in San-ao decoction and its series of formulae. The results also showed a wide variation in the content of the identified active compounds in these samples, which could also be helpful to illustrate the drug interactions after some herbs combined in different formulations. PMID:23117432

Shu, Xiaoyun; Tang, Yuping; Jiang, Chenxue; Shang, Erxing; Fan, Xinshen; Ding, Anwei

2012-11-01

110

GRAVITY: The AO-Assisted, Two-Object Beam-Combiner Instrument for the VLTI  

NASA Astrophysics Data System (ADS)

We present the proposal for the infrared adaptive optics (AO) assisted, two-object, high-throughput, multiple-beam-combiner GRAVITY for the VLTI. This instrument will be optimized for phase-referenced interferometric imaging and narrow-angle astrometry of faint, red objects. Following the scientific drivers, we analyze the VLTI infrastructure, and subsequently derive the requirements and concept for the optimum instrument. The analysis can be summarized with the need for highest sensitivity, phase referenced imaging and astrometry of two objects in the VLTI beam, and infrared wavefront-sensing. Consequently our proposed instrument allows the observations of faint, red objects with its internal infrared wavefront sensor, pushes the optical throughput by restricting observations to K-band at low and medium spectral resolution, and is fully enclosed in a cryostat for optimum background suppression and stability. Our instrument will thus increase the sensitivity of the VLTI significantly beyond the present capabilities. With its two fibers per telescope beam, GRAVITY will not only allow the simultaneous observations of two objects, but will also push the astrometric accuracy for UTs to 10 ?as, and provide simultaneous astrometry for up to six baselines.

Eisenhauer, F.; Perrin, G.; Rabien, S.; Eckart, A.; Léna, P.; Genzel, R.; Abuter, R.; Paumard, T.; Brandner, W.

111

First On-sky Results with GeMS, the Gemini Multi-conjugate AO System  

NASA Astrophysics Data System (ADS)

GeMS, the Gemini Multi-Conjugate Adaptive Optics (MCAO) System, is the first multi-sodium based Laser Guide Star (LGS) Adaptive Optics (AO) system used for astronomy. It uses five LGSs distributed on a 1 arcmin constellation to measure and compensate for atmospheric distortions and delivers a uniform, close to diffraction- limited Near-Infrared (NIR) image over an extended FoV of 2arcmin. GeMS first light occured in December 2011. The first compensated images demonstrate H-band Strehl Ratios (SR) in excess of 35% and Full-Width Half Maximum (FWHM) of or below 50 mas, in good seeing condition, averaged over a field of view of 85x85 arcsec In this paper we report on these early results, analyzing image quality in term of FWHM, SR, and field uniformity thereof. The PSF shape is analyzed, and the factor limiting performance are discussed. Finally, we present a first astrometric analysis, demonstrating astrometric errors as low as 420 microarcsecond for the data analyzed in this paper.

Neichel, Benoit; Rigaut, F.; Arriagada, G.; Serio, A.; Araujo, C.; Boccas, M.; Carrasco, R.; Collao, F.; Diggs, S.; d'Orgeville, C.; Fesquet, V.; Galvez, R.; Gausachs, G.; Luhrs, J.; Marchant, C.; Montes, V.; Moreno, C.; Pessev, P.; Rambold, W.; Trujillo, C. A.; Urrutia, C.; Vidal, F.; Vucina, T.

2013-01-01

112

Laser testing of an Iris AO dielectric-coated segmented MEMS DM  

NASA Astrophysics Data System (ADS)

Iris AO has been developing dielectric-coated segmented MEMS deformable mirrors (DM) for use in laser applications that range from 355-1540 nm. In order to mitigate deformation from residual stress in the thick dielectric coatings, a stress-compensation layer has been added to the underside if the DM segments. This paper describes fabrication results of DMs with high reflectance dielectric coatings for 532 nm, 1064 nm, and 1540 nm. Additionally, a DM with a 532 nm coating has been tested with a 2 W, 532 nm CW laser. Laser testing shows the DM can handle 300 W/cm2 with off-theshelf packaging. Projections show that with good heat sinking, the same DM can handle laser power densities of 2800 W/cm2. The coatings showed no signs of damage after exposure to a w0=25 ?m beam with a power density of 205 kW/cm2 for 105 minutes at the center of a segment and at segment edges exposed to 180 kW/cm2 for 45 minutes.

Helmbrecht, Michael A.; He, Min; Norton, Andrew P.; Gavel, Donald T.

2011-09-01

113

Aquecimento alfvênico viscoso-resistivo em discos de acresção ao redor de estrelas T Tauri clássicas  

NASA Astrophysics Data System (ADS)

Com a crescente disponibilidade de dados observacionais sobre estrelas T Tauri, a busca por modelos mais precisos vem se tornando cada vez maior. Estes modelos devem explicar, entre outras coisas, o mecanismo dissipativo responsável pelo transporte de momento angular no disco de acresção que acredita-se, circunda estas estrelas. O mecanismo mais viável, do ponto de vista teórico, é uma instabilidade MHD conhecida como "instabilidade magnetorotacional ou Balbus-Hawley" (IBH). Esta instabilidade veio mostrar que o campo magnético desempenha um papel importante na evolução destes objetos mas requer, no entanto, um acoplamento mínimo entre o gás e o campo magnético no disco que não é atingido para os valores de temperatura obtidos do modelo padrão. Contudo, alguns mecanismos de aquecimento para o disco precisam ser examinados. Neste trabalho, propomos a dissipação de ondas Alfvén como uma fonte de aquecimento para o disco. Se o gás apresentar uma condutividade elétrica finita e viscosidade, teremos um tipo de amortecimento para as ondas denominado amortecimento viscoso-resistivo que será aqui considerado. Este mecanismo é aplicado ao modelo de disco em camadas. Calculam-se as taxas de aquecimento Alfvênico, a temperatura efetiva do disco bem como as taxas de ionização decorrentes deste aquecimento e do aquecimento gerado pela absorção de raios cósmicos. Comparações com os dados observacionais de Kitamura et. al. (2001) são efetuadas, ressaltando-se os pontos comuns entre suas observações e nossos dados teóricos.

Santana, W. M.; Vasconcelos, M. J.

2003-08-01

114

Health Hazard Evaluation Report No. HHE-79-104-838, A.O. Smith-Inland, Inc., Little Rock, Arkansas.  

National Technical Information Service (NTIS)

In May 1979, the National Institute for Occupational Safety and Health (NIOSH) received a request from A.O. Smith-Inland, Inc., Little Rock, AR., to evaluate possible hazards to their Plant No. 2 employees from exposures to styrene, epichlorohydrin, dimet...

H. L. Markel T. Wilcox

1981-01-01

115

Assistência de enfermagem ao paciente em pulsoterapia com corticosteróide Nursing care of patients on corticosteroid pulse therapy  

Microsoft Academic Search

ResUMo introdução: A pulsoterapia com corticosteróide endovenoso consiste na administração de corticosteróides em altas doses (a partir de 1 g\\/ dia), por três dias ou mais, ou em dias alternados. A necessidade de hospitalização ocorre devido aos possíveis efeitos colaterais que o paciente pode apresentar durante a infusão da droga; para tanto a monitorização dos parâmetros vitais, além de identificar

Deborah Rozencwajg; Carla Fátima; Paixão Nunes; Luciane Midory Sakuma; Cláudia Regina Laselva; Bartira Aguiar Roza

116

Liquid freshwater transport and Polar Surface Water characteristics in the East Greenland Current during the AO02 Oden expedition  

Microsoft Academic Search

Dynamical features of the East Greenland Current (EGC) are synthesized from a survey conducted by the Swedish icebreaker Oden during the International Arctic Ocean – 02 expedition (AO-02) in May 2002 with emphasis on the liquid freshwater transport and Polar Surface Water. The data include hydrography and lowered acoustic doppler current profiler (LADCP) velocities in eight transects along the EGC,

Johan Nilsson; Göran Björk; Bert Rudels; Peter Winsor; Daniel Torres

2008-01-01

117

Increasing influence of ENSO and decreasing influence of AO/NAO in the recent decades over northwest India winter precipitation  

NASA Astrophysics Data System (ADS)

The interannual variability of northwest India winter precipitation (NWIWP) is examined in association with the variability of surface temperature, mean sea level pressure, tropospheric geopotential height, and wind patterns over the globe to study the changes in the large-scale circulation features associated with NWIWP. The data for the study have been considered from 1950 to 2008 (for a period of 59 years). The analysis is based on correlations and composites performed using India Meteorological Department records based on station data. We find that the interannual variability of NWIWP is influenced by Arctic Oscillation/North Atlantic Oscillation (AO/NAO) and El Niño-Southern Oscillation (ENSO) phenomena. Above-normal NWIWP is associated with the positive phase of AO/NAO and the warm phase of ENSO, but showing strong secular variations. During the recent decades, the influence of ENSO over NWIWP has increased while the influence of AO/NAO has decreased. This conclusion is supported by a consistency across the different observation data sets employed in the study. A physical mechanism for such effect is proposed, by which western disturbances are intensified over NW India by the intensification of Asian westerly jet stream over Middle East during positive phase of AO/NAO and shift and intensification of Asian jet to the lower latitudes during the warm phase of ENSO.

Yadav, R. K.; Rupa Kumar, K.; Rajeevan, M.

2009-06-01

118

Correlation of AO and Lauge-Hansen Classification Systems for Ankle Fractures to the Mechanism of Injury.  

PubMed

BACKGROUND: Our aim was to assess whether the Lauge-Hansen (LH) and the Muller AO classification systems for ankle fractures radiographically correlate with in vivo injuries based on observed mechanism of injury. METHODS: Videos of potential study candidates were reviewed on YouTube.com. Individuals were recruited for participation if the video could be classified by injury mechanism with a high likelihood of sustaining an ankle fracture. Corresponding injury radiographs were obtained. Injury mechanism was classified using the LH system as supination/external rotation (SER), supination/adduction (SAD), pronation/external rotation (PER), or pronation/abduction (PAB). Corresponding radiographs were classified by the LH system and the AO system. RESULTS: Thirty injury videos with their corresponding radiographs were collected. Of the video clips reviewed, 16 had SAD mechanisms and 14 had PER mechanisms. There were 26 ankle fractures, 3 nonfractures, and 1 subtalar dislocation. Twelve fractures with SAD mechanisms had corresponding SAD fracture patterns. Five PER mechanisms had PER fracture patterns. Eight PER mechanisms had SER fracture patterns and 1 had SAD fracture pattern. When the AO classification was used, all 12 SAD type injuries had a 44A type fracture, whereas the 14 PER injuries resulted in nine 44B fractures, two 44C fractures, and three 43A fractures. CONCLUSION: When injury video clips of ankle fractures were matched to their corresponding radiographs, the LH system was 65% (17/26) consistent in predicting fracture patterns from the deforming injury mechanism. When the AO classification system was used, consistency was 81% (21/26). The AO classification, despite its development as a purely radiographic system, correlated with in vivo injuries, as based on observed mechanism of injury, more closely than did the LH system. LEVEL OF EVIDENCE: Level IV, case series. PMID:23729206

Rodriguez, Edward K; Kwon, John Y; Herder, Lindsay M; Appleton, Paul T

2013-05-31

119

Orbital Period Changes and Their Evolutionary Status for the Weak-Contact Binaries. III. AO Camelopardalis and AH Tauri  

NASA Astrophysics Data System (ADS)

In this paper, we presented multicolor photometric observations for two eclipsing binaries, AO Camelopardalis and AH Tauri, obtained on 2008 December 16 and 17. Using the Wilson-Devinney Code, the photometric solution of AH Tau was determined from our new CCD data. The mass ratio and the fill-out factor are q = 0.503(±0.003) and f = 10.8%(±0.1%), respectively. This indicates that AH Tau is in weak contact. For the weak-contact binary AO Cam, BVI light curves clearly show a difference in the heights of the maxima (i.e., the O'Connell effect), which may be explained by spot activity. By analyzing the O - C curves for AO Cam and AH Tau, it is found that the orbital periods appear to show a secular period decrease with a cyclic variation. The observed period modulation is ?P/P ~ 10-6. For AO Cam, the cyclic oscillation with a short period of 7.63(±0.07) yr and a low amplitude of 0fd0019(±0fd0003) may be preferably attributed to the cyclic magnetic activity. The period and amplitude of the cyclic variation for AH Tau are 45.8(±1.1) yr and 0fd0171(±0fd0005), which may more likely result from the light-time effect via a third body. The secular period decrease rates are dP/dt = -1.26(±0.04) × 10-7 days yr -1 for AO Cam and dP/dt = -6.98(±0.07) × 10-8 days yr -1 for AH Tau. This kind of period decrease can be plausibly explained by the mass transfer from the primary to the secondary, and may result in the system evolving into a deep contact configuration.

Yang, Y.-G.; Wei, J.-Y.; Kreiner, J. M.; Li, H.-L.

2010-01-01

120

The heavy metal tolerant soil bacterium Achromobacter sp. AO22 contains a unique copper homeostasis locus and two mer operons.  

PubMed

Copper-containing compounds are introduced into the environment through agricultural chemicals, mining, and metal industries and cause severe detrimental effects on ecosystems. Certain microorganisms exposed to these stressors exhibit molecular mechanisms to maintain intracellular copper homeostasis and avoid toxicity. We have previously reported that the soil bacterial isolate Achromobacter sp. AO22 is multi-heavy metal tolerant and exhibits a mer operon associated with a Tn21 type transposon. The present study reports that AO22 also hosts a unique cop locus encoding copper homeostasis determinants. The putative cop genes were amplified from the strain AO22 using degenerate primers based on reported cop and pco sequences, and a constructed 10,552 base pair contig (GenBank Accession No. GU929214). BLAST analyses of the sequence revealed a unique cop locus of 10 complete open reading frames, designated copSRABGOFCDK, with unusual separation of copCD from copAB. The promoter areas exhibit two putative cop boxes, and copRS appear to be transcribed divergently from other genes. The putative protein CopA may be a copper oxidase involved in export to the periplasm, CopB is likely extracytoplasmic, CopC may be periplasmic, CopD is cytoplasmic/ inner membrane, CopF is a P-type ATPase, and CopG, CopO, and CopK are likely copper chaperones. CopA, B, C, and D exhibit several potential copper ligands and CopS and CopR exhibit features of two-component regulatory systems. Sequences flanking indicate the AO22 cop locus may be present within a genomic island. Achromobacter sp. strain AO22 is thus an ideal candidate for understanding copper homeostasis mechanisms and exploiting them for copper biosensor or biosorption systems. PMID:22573150

Ng, Shee Ping; Palombo, Enzo A; Bhave, Mrinal

2012-06-01

121

The Hydrography in Shen-ao Bay, North Taiwan, without Thermal Plume  

NASA Astrophysics Data System (ADS)

Located at northern Taiwan, the Shen-ao Bay is characterized by thermal plume of a power plant and fresh water of the Jiu-fen Brook, causing the surface water of high temperature and low salinity which makes a significant stratification against the subsurface water. The power plant was extended in 2008 and stopped discharging warm water for one year, providing an opportunity to survey the hydrographic and current fields of the bay in natural condition. During 2005~2009, there were seven times hydrographic surveys in the bay and four times aside the coast. When the plume appeared, the surface water could be 2~4 degree warmer than the subsurface water. The surface warm water disappeared when the power plant was shutdown. In such a circumstance, the brook water might even cause the surface water cooler than the subsurface water. After the thermal plume was terminated, coastal temperature descended about 8 degree in June-July and 6 degree in August-September. The ADP (Acoustic Doppler Profiler) and CTD surveys disclosed a bottom cold water intrusion which did not relate to the tidal current and almost happened in 2~5 hours after sunset. The observations of hydrographic field together with local winds revealed that the bottom intrusion was induced by the land breath. In summer, the daily intrusion occurred earlier, thicker and staying longer than in winter. Despite the plume existed or not, the temperature profiles in the bay of a depth shallower than 20 m could become a 3-stepwise pattern under the bottom cold water intrusion.

Wu, C.; Hu, J.; Lee, C.

2009-12-01

122

Postoperative bedrest improves the alignment of thoracolumbar burst fractures treated with the AO spinal fixator  

PubMed Central

Background A loss of reduction due to inadequate support of the anterior column when using short-segment instrumentation to treat burst fracture and novel methods for support of the anterior column through a posterior approach to augment posterior instrumentation have been reported in the literature. We hypothesized that if anterior column support is an important adjunct to posterior short-segment instrumentation, then avoidance of axial load until sufficient anterior column healing occurs, allowing load-sharing with the implant, would improve spinal alignment at follow-up. Methods We conducted a retrospective cohort study in which consecutive patients who had instrumentation and fusion with the AO spinal fixator were immediately ambulated after surgery or had 4 weeks of bedrest. We measured kyphosis and wedge angles preoperatively, immediately postoperatively and at the time of final follow-up. We used radiologic measures to assess instrumentation and bone failure. Results We found significant differences in the mean loss of wedge and kyphosis angle correction between patients immediately ambulated and those who had 4 weeks of bedrest (0.71º v. ? 4.73º for wedge and 1.81º v. ? 6.55º for kyphosis, respectively). There was significant correlation between instrumentation and bone failure in both the immediate ambulation and bedrest groups. Conclusion Bedrest improves the maintenance of intraoperative sagittal alignment correction, which is in agreement with the theory that inadequate support of the anterior spinal column is the mechanism for loss of reduction when using short-segment instrumentation to treat burst fractures. Therefore, addressing the anterior column directly through anterior surgery or by employing novel techniques in posterior surgery is recommended if one of the goals of treatment is to maintain the sagittal correction achieved at the time of surgery. Trying to achieve this goal by addressing posterior implant design or bone quality alone will not be successful because instrumentation and bone failure occur together.

Dang, Yen; Yen, David; Hopman, Wilma M.

2009-01-01

123

Expression of Pisum sativum PsAO3 gene, which encodes an aldehyde oxidase utilizing abscisic aldehyde, is induced under progressively but not rapidly imposed drought stress.  

PubMed

Aldehyde oxidase (AO; EC 1.2.3.1) catalyzes the final step of abscisic acid (ABA) biosynthesis, which is the oxidation of abscisic aldehyde (ABAld) to ABA. Gene expression analyses indicate that the stress-induced Pisum sativum PsAO? isoform, which effectively uses ABAld as a substrate, is encoded by the PsAO3 gene. PsAO3 was heterologously expressed in Pichia pastoris and the recombinant PsAO3 protein revealed substrate preferences highly similar to the native PsAO? protein present in the pea leaves and roots. Both proteins prefer indole-3-aldehyde and naphthaldehyde as substrates, although high activities against abscisic aldehyde and citral were also observed. The Km values of PsAO3 for naphthaldehyde and abscisic aldehyde (4.6 and 5.1 ?M, respectively) were the lowest among the substrates tested. PsAO3 activity was almost completely inhibited by potassium cyanide, diphenyleneiodonium, and methanol. Rapidly imposed drought stress did not increase the level of PsAO3 mRNA or activity of any AO isoform, although an enhanced ABA accumulation and induction of PsNCED2 and -3 (9-cis-epoxycarotenoid dioxygenase; EC 1.13.11.51) expression, both in the pea roots and leaves, was observed. During a progressively induced drought, the level of PsAO3 transcript and PsAO? activity increased significantly in the roots and leaves, whereas ABA accumulation occurred only in the leaves where it was accompanied by induction of the PsNCED3 expression. Therefore, we suppose that next to NCED, also AO (mainly PsAO?) might be involved in regulation of the drought-induced ABA synthesis. However, while the "constitutive activity" of PsAO? is sufficient for the fast generation of ABA under rapid drought stress, the enhanced PsAO? activity is required for the progressive and long-term ABA accumulation in the leaves under progressive drought stress. PMID:23876699

Zdunek-Zastocka, Edyta; Sobczak, Miros?aw

2013-07-06

124

AO-OCT with reference arm phase shifting for complex conjugate artifact-free imaging of in vivo retinal structures  

NASA Astrophysics Data System (ADS)

We summarize the performance of an AO-OCT system with reference arm phase shifting for complex conjugate artifactfree imaging of in vivo retinal structures. As a complex conjugate artifact removal (CCR) method we used a previously reported technique requiring constant phase shifts between consecutive A-scans. In our system these shifts were generated by continuous beam path-length changes from offsetting the pivot point of the scanning mirror placed in the system reference arm. In order to reconstruct the complex spectral fringe pattern we used Fourier transformation along the transverse axis and a filtering algorithm. The suppression ratio of mirror complex artifact images was assessed based on acquired in vivo CCR AO-OCT images. Finally, potential problems and limitations connected with this acquisition scheme and data processing algorithms are discussed.

Zawadzki, Robert J.; Kim, Dae Yu; Jones, Steven M.; Pilli, Suman; Olivier, Scot S.; Werner, John S.

2011-02-01

125

Spin-Up of the White Dwarf in the Intermediate Polar Ao-Piscium = H2252-035  

Microsoft Academic Search

Walraven photometric observations made in 1983 and 1984 of the intermediate polar AO Psc\\/H2252-035 are used to derive new times of maximum light for its orbital and pulsational light curves. Combining these times with previously published values the authors find that the periods of both pulsations show a secular decrease. The spin-up rate P of the white dwarf equals P=

S. van Amerongen; H. Kraakman; E. Damen; S. Tjemkes; J. van Paradijs

1985-01-01

126

SIMS chemical analysis of extended impacts on the leading and trailing edges of LDEF experiment AO187-2  

Microsoft Academic Search

The Long Duration Exposure Facility (LDEF) Experiment AO187-2 consisted of 237 capture cells, 120 on the leading edge and 117 on the trailing edge. Each cell was made of polished Ge plates covered with 2.5 micron thick mylar foil at 200 microns from the Ge. Although all leading edge cells and 105 trailing edge cells had lost their plastic covers

S. Amari; J. Foote; Charles G. Simon; P. Swan; R. M. Walker; E. Zinner; E. K. Jessberger; G. Lange; F. Stadermann

1992-01-01

127

Io Volcanic Activity Since 2003 As Seen By 8-10-m-class Telescopes Equipped With Adaptive Optics (ao)  

NASA Astrophysics Data System (ADS)

Io, most volcanic place in the our Solar System, has been monitored since 2003 on a semi-irregular basis using the Keck II and the Gemini North Adaptive Optics (AO) systems equipped with a near infrared (NIR) camera sensitive to 5 um. We present a global view of Io volcanic activity, identifying permanent hot spots, sporadic outbursts, and possible surface changes from these observations. AO observations were also obtained at the time of the New Horizons flyby in early 2007, from these data we can constrain the style of volcanism at specific volcanic centers. Finally, we discuss the relatively quiescent state of Io volcanism observed over the past 2 years. The monitoring of Io's volcanic activity will continue through 2016, which includes the arrival of the Juno spacecraft in July of that year, and beyond. An ever-increasing timeline of volcanic activity and thermal emission variability continues to be constructed and which will be further complimented by data obtained by other missions to the Jupiter system (such as JUICE, or a dedicated Europa or Io mission). Until these missions, however, the task of monitoring Io's volcanic activity will be from large, AO-enabled ground-based telescopes. The support of the NASA Planetary Outer Planets Research Program is acknowledged.

Marchis, Franck; Davies, A.

2012-10-01

128

High Resolution H? Images of the Binary Low-mass Proplyd LV 1 with the Magellan AO System  

NASA Astrophysics Data System (ADS)

We utilize the new Magellan adaptive optics system (MagAO) to image the binary proplyd LV 1 in the Orion Trapezium at H?. This is among the first AO results in visible wavelengths. The H? image clearly shows the ionization fronts, the interproplyd shell, and the cometary tails. Our astrometric measurements find no significant relative motion between components over ~18 yr, implying that LV 1 is a low-mass system. We also analyze Large Binocular Telescope AO observations, and find a point source which may be the embedded protostar's photosphere in the continuum. Converting the H magnitudes to mass, we show that the LV 1 binary may consist of one very-low-mass star with a likely brown dwarf secondary, or even plausibly a double brown dwarf. Finally, the magnetopause of the minor proplyd is estimated to have a radius of 110 AU, consistent with the location of the bow shock seen in H?. This paper includes data gathered with the 6.5 m Magellan Telescopes located at the Las Campanas Observatory, Chile.

Wu, Y.-L.; Close, L. M.; Males, J. R.; Follette, K.; Morzinski, K.; Kopon, D.; Rodigas, T. J.; Hinz, P.; Puglisi, A.; Esposito, S.; Pinna, E.; Riccardi, A.; Xompero, M.; Briguglio, R.

2013-09-01

129

Design, Implementation, and On-Sky Performance of an Advanced Apochromatic Triplet Atmospheric Dispersion Corrector for the Magellan Adaptive Optics System and VisAO Camera  

NASA Astrophysics Data System (ADS)

We present the novel design, laboratory verification, and on-sky performance of our advanced triplet atmospheric dispersion corrector (ADC), an important component of the Magellan Adaptive Optics system (MagAO), which recently achieved first light in December 2012. High-precision broadband (0.5--1.0 ?m) atmospheric dispersion correction at visible wavelengths is essential both for wavefront sensing (WFS) on fainter guide stars, and for performing visible AO science using our VisAO science camera. At 2 airmasses (60° from zenith) and over the waveband 500--1000 nm, our triplet design produces a 57% improvement in geometric rms spot size, a 33% improvement in encircled energy at 20? radius, and a 62% improvement in Strehl ratio when compared to a conventional doublet design. This triplet design has been fabricated, tested in the lab, and integrated into the MagAO WFS and the VisAO science camera. We present on-sky results of the ADC in operation with the MagAO system. We also present a zero-beam-deviation triplet ADC design, which will be important to future AO systems that require precise alignment of the optical axis over a large range of airmasses in addition to diffraction-limited broadband dispersion correction.

Kopon, Derek; Close, Laird M.; Males, Jared R.; Gasho, Victor

2013-08-01

130

Role of Radical Formation at Tyrosine 193 in the Allene Oxide Synthase Domain of a Lipoxygenase-AOS Fusion Protein from Coral†  

PubMed Central

Coral allene oxide synthase (cAOS), a fusion protein with 8R-lipoxygenase in Plexaura homomalla, is a hemoprotein with sequence similarity to catalases. cAOS reacts rapidly with the oxidant peracetic acid to form heme compound I and intermediate II. Concomitantly, an electron paramagnetic resonance (EPR) signal with tyrosyl radical-like features, centered at a g-value of 2.004–2.005, is formed. The radical is identified as tyrosyl by changes in EPR spectra when deuterated tyrosine is incorporated in cAOS. The radical location in cAOS is determined by mutagenesis of Y193 and Y209. Upon oxidation, native cAOS and mutant Y209F exhibit the same radical spectrum, but no significant tyrosine radical forms in mutant Y193H, implicating Y193 as the radical site in native cAOS. Estimates of the side chain torsion angles for the radical at Y193, based on the ?-proton isotropic EPR hyperfine splitting, Aiso, are ?1 = 21 to 30° and ?2 = ?99 to ?90°. The results show that cAOS can cleave nonsubstrate hydroperoxides by a heterolytic path, although a homolytic course is likely taken in converting the normal substrate, 8R-hydroperoxyeicosatetraenoic acid (8R-HpETE), to product. Coral AOS achieves specificity for the allene oxide formed by selection of the homolytic pathway normally, while it inactivates by the heterolytic path with nonoptimal substrates. Accordingly, with the nonoptimal substrate, 13R-hydroperoxyoctadecadienoic acid (13R-HpODE), mutant Y193H is inactivated after turning over significantly fewer substrate molecules than required to inactivate native cAOS or the Y209F mutant because it cannot absorb oxidizing equivalents by forming a radical at Y193.

Wu, Fayi; Katsir, Leron J.; Seavy, Margaret; Gaffney, Betty J.

2005-01-01

131

ANÁLISE DOS INDICADORES DE HEMORRAGIA LETAL EM VÍTIMAS DE TRAUMA PENETRANTE DE TRONCO ADMITIDAS EM CHOQUE: UM MÉTODO OBJETIVO PARA SELECIONAR OS CANDIDATOS AO \\  

Microsoft Academic Search

RESUMO: Objetivo: Identificar os indicadores de hemorragia letal em vítimas de trauma penetrante de tronco, admitidas com hipotensão arterial sistêmica e analisar sua aplicabilidade na seleção dos candidatos ao \\

José Gustavo Parreira

132

English vowel production by native Mandarin speakers: Influences of AoA, LoR, education, perception, and orthography  

NASA Astrophysics Data System (ADS)

This study investigates relations among several factors that are expected to influence vowel production in second language learning, including AoA, LoR, L2 and general education, L2 perception, and orthography. Vowel production will be examined through duration and formant frequency measurements and listener identification. The results will be analyzed in relation to educational background and language use. Among the educational factors examined are general education level, English education (in their native land and/or New York City), and sound-annotating system experiences in Mandarin (Pinyin or Zhuyin). The language-use factors include AoA, LoR, language spoken at work and at home, and perception of English vowels. The hypotheses addressed include: (1) educational background, language use, and sound-annotating system experiences in Mandarin all influence L2 English speakers perception and production of English vowels; (2) the more accurately an L2 listener discriminates a vowel contrast, the more distinctly he/she produces that contrast.

Bell-Berti, Fredericka; Yu, Yan Helen

2005-09-01

133

Preferential melt intercalation of clay in ABS\\/brominated epoxy resin–antimony oxide (BER–AO) nanocomposites and its synergistic effect on thermal degradation and combustion behavior  

Microsoft Academic Search

ABS\\/organo montmorillonite (OMT) nanocomposites and ABS\\/brominated epoxy resin–antimony oxide (BER–AO)\\/OMT nanocomposites were prepared via melt compounding. The dispersion of OMT in nanocomposites was investigated by wide-angle X-ray diffraction and transmission electron microscopy. The results revealed an intercalated structure in ABS\\/OMT nanocomposites and the OMT layers mainly distribute in SAN phase. However, a completely exfoliated structure was found in ABS\\/BER–AO\\/OMT nanocomposites

Haiyun Ma; Zhengping Fang; Lifang Tong

2006-01-01

134

Evaluation of a Novel Integrated Bioreactor—AOS System for Treating Oil-Containing Restaurant Wastewater on Site in Hong Kong  

Microsoft Academic Search

AOS system is an anaerobic digestion reactor (A-section, UASB or UBF), oxidation degradation reactor (O-section, aerobic biofilm reactor), and physical sedimentation tank (S-section) 3-in-1 integrated reactor. The compact bioreactor was applied to treat oil-containing restaurant's wastewater on site in Hong Kong. The treatment efficiency was observed at different HRT. Experimental results indicated that the AOS system for treating oil-containing restaurant

L. Wang; Q. Zhou; H. Chua

2005-01-01

135

Enhanced catalytic degradation of AO7 in the CeO 2–H 2O 2 system with Fe 3+ doping  

Microsoft Academic Search

Degradation of Acid Orange 7 (AO7) was employed to evaluate the catalytic activity of the Fe3+ doped CeO2 in the presence of H2O2. Fe3+ doping in the ceria improved the degradation of AO7 in the dark as well as under the visible light irradiation and showed the highest catalytic activity at Fe\\/Ce=1\\/100 (FC100). XPS, Raman and EPR studies showed that

Wandong Cai; Feng Chen; Xingxing Shen; Lijing Chen; Jinlong Zhang

2010-01-01

136

Getting lucky with adaptive optics: diffraction-limited resolution in the visible with current AO systems on large and small telescopes  

NASA Astrophysics Data System (ADS)

We have recently demonstrated diffraction-limited resolution imaging in the visible on the 5m Palomar Hale telescope. The new LAMP instrument is a Lucky Imaging backend camera for the Palomar AO system. Typical resolutions of 35-40 mas with Strehls of 10-20% were achieved at 700nm, and at 500nm the FWHM resolution was as small as 42 milliarcseconds. In this paper we discuss the capabilities and design challenges of such a system used with current and near future AO systems on a variety of telescopes. In particular, we describe the designs of two planned Lucky Imaging + AO instruments: a facility instrument for the Palomar 200" AO system and its PALM3K upgrade, and a visible-light imager for the CAMERA low-cost LGS AO system planned for the Palomar 60" telescope. We introduce a Monte Carlo simulation setup that reproduces the observed PSF variability behind an adaptive optics system, and apply it to predict the performance of 888Cam and CAMERA. CAMERA is predicted to achieve diffraction-limited resolution at wavelengths as short as 350 nm. In addition to on-axis resolution improvements we discuss the results of frame selection with the aim of improving other image parameters such as isoplanatic patch sizes, showing that useful improvements in image quality can be made by Lucky+AO even with very temporally and spatially undersampled data.

Law, N. M.; Dekany, R. G.; Mackay, C. D.; Moore, A. M.; Britton, M. C.; Velur, V.

2008-07-01

137

The First Circumstellar Disk Imaged in Silhouette at Visible Wavelengths with Adaptive Optics: MagAO Imaging of Orion 218-354  

NASA Astrophysics Data System (ADS)

We present high-resolution adaptive optics (AO) corrected images of the silhouette disk Orion 218-354 taken with Magellan AO (MagAO) and its visible light camera, VisAO, in simultaneous differential imaging mode at H?. This is the first image of a circumstellar disk seen in silhouette with AO and is among the first visible light AO results in the literature. We derive the disk extent, geometry, intensity, and extinction profiles and find, in contrast with previous work, that the disk is likely optically thin at H?. Our data provide an estimate of the column density in primitive, ISM-like grains as a function of radius in the disk. We estimate that only ~10% of the total submillimeter derived disk mass lies in primitive, unprocessed grains. We use our data, Monte Carlo radiative transfer modeling, and previous results from the literature to make the first self-consistent multiwavelength model of Orion 218-354. We find that we are able to reproduce the 1-1000 ?m spectral energy distribution with a ~2-540 AU disk of the size, geometry, small versus large grain proportion, and radial mass profile indicated by our data. This inner radius is a factor of ~15 larger than the sublimation radius of the disk, suggesting that it is likely cleared in the very interior.

Follette, Katherine B.; Close, Laird M.; Males, Jared R.; Kopon, Derek; Wu, Ya-Lin; Morzinski, Katie M.; Hinz., Philip; Rodigas, Timothy J.; Puglisi, Alfio; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa

2013-09-01

138

Since when or how often? Dissociating the roles of age of acquisition (AoA) and lexical frequency in early visual word processing.  

PubMed

The aim of the study was to investigate the effect of both word age of acquisition (AoA) and frequency of occurrence on the timing and topographical distribution of ERP components. The processing of early- versus late-acquired words was compared with that of high-frequency versus low-frequency words. Participants were asked to perform an orthographic task while EEG was recorded from 128 sites. RTs showed an effect of both word AoA and lexical frequency. ERPs revealed a neuro-functional dissociation between AoA and frequency effects in early word processing. AoA modulated the amplitude of left occipito-temporal selection-negativity, suggesting an effect of AoA on early orthographic and lexical access and revealing the crucial role of AoA in determining how words are neurally represented in the ventral pathway. Lexical frequency modulated the amplitude of left anterior negativity, providing evidence for the involvement of the left inferior frontal cortex in the processing of low-frequency words. PMID:23314421

Adorni, Roberta; Manfredi, Mirella; Proverbio, Alice Mado

2013-01-11

139

A EFICIÊNCIA DOS PROGRAMAS EDUCATIVOS IMPLEMENTADOS POR EMPRESAS E ORGÃOS GOVERNAMENTAIS COMO FORMA DE PREVENÇÃO AO IMPACTO AMBIENTAL CAUSADO PELO DESCARTE INCORRETO DAS EMBALAGENS DE AGROTÓXICOS EM CAMPOS GERAIS NO SUL DO ESTADO DE MINAS GERAIS  

Microsoft Academic Search

Este estudo atua com uma ferramenta de feedback quanto aos resultados obtidos com os programas educacionais em combate ao descarte incorreto de embalagens vazias no município de Campos Gerais no Sul do Estado de Minas Gerais. Os objetivos são mensurar a eficiência dos -programas educativos implementados por empresas e órgãos governamentais como forma de prevenção ao impacto ambiental causado pelo

Jairo Gustavo De Lima; Marcelo Marcio Romaniello; Cristhiane Oliveira Da Graca Amancio

2008-01-01

140

Use of the AO veterinary mini 'T'-plate for stabilisation of distal radius and ulna fractures in toy breed dogs.  

PubMed

The use of the AO (Arbeitsgemeinschaft für Osteosynthesefragen) veterinary mini 'T'-plate for stabilisation of distal radius and ulna fractures in toy breed dogs was evaluated in a retrospective study. All of the 14 dogs in the study weighed 3.5 kg or less. The AO mini 'T'-plate was used as the final means of fixation in all cases. It was used as the primary form of stabilisation in ten dogs, and in four dogs it was used at revision surgery. In all cases, of the fractures healed. Return to function was graded 'as excellent' in six cases, 'good' in four and 'fair' in two. Two dogs were lost to long-term follow up. It was concluded that the AO veterinary mini 'T'-plate is a suitable choice of implant for stabilisation of distal radius and ulna fractures in toy breed dogs, especially when the distal fragment is very small. PMID:16594212

Hamilton, M H; Langley Hobbs, S J

2005-01-01

141

Snow anomaly events from historical documents in eastern China during the past two millennia and implication for low-frequency variability of AO/NAO and PDO  

NASA Astrophysics Data System (ADS)

Models and instrumental data indicate that the spatial and temporal variations of snow cover are significantly related to atmospheric circulation (e.g. the AO/NAO). Here, we present historical snow anomaly events during the past two millennia that provide a unique temporal window to studying long-term AO/NAO, a prominent phenomenon in wintertime. Direct descriptions such as ``no snow during the winter'' and ``pray God for snow'' are interpreted as convincing evidence for snow anomalies. The variations of positive/negative snow abnormal events show clear decadal to century variations during the past two millennia. Based on the previous instrumental research and comparison with other reconstruction data, we suggest the Index of Abnormal Snow (IAS) may be an AO-like atmospheric variability. The winter during the Medieval Warm Period (MWP) (AD 900-1300) might be strongly influenced by a predominantly positive AO with less snow condition, whereas the Little Ice Age (LIA) (AD 1300-1900) by negative AO concomitant with heavier snowfalls in East Asia. Our data show that a warm climate period (the MWP)/a cold period (the LIA) can be perturbed by a cold spell/a warm spell which are linked with a change in atmospheric circulation. Low-frequency variability of snow records may be intrinsic to the natural climate system. Although the dynamic mechanisms linking snow anomalies with atmospheric circulation (the AO/NAO, the PDO) is unclear on the decadal to century time scales, Pacific Ocean may play an important role in regulating atmospheric circulations since the IAS is highly correlated with the reconstruction of PDO.

Chu, Guoqiang; Sun, Qing; Wang, Xiaohua; Sun, Junying

2008-07-01

142

Purification of Cytochrome P450 and Ferredoxin, Involved in Bisphenol A Degradation, from Sphingomonas sp. Strain AO1  

PubMed Central

In a previous study (M. Sasaki, J. Maki, K. Oshiman, Y. Matsumura, and T. Tsuchido, Biodegradation 16:449-459, 2005), the cytochrome P450 monooxygenase system was shown to be involved in bisphenol A (BPA) degradation by Sphingomonas sp. strain AO1. In the present investigation, we purified the components of this monooxygenase, cytochrome P450 (P450bisd), ferredoxin (Fdbisd), and ferredoxin reductase (Redbisd). We demonstrated that P450bisd and Fdbisd are homodimeric proteins with molecular masses of 102.3 and 19.1 kDa, respectively, by gel filtration chromatography analysis. Spectroscopic analysis of Fdbisd revealed the presence of a putidaredoxin-type [2Fe-2S] cluster. P450bisd, in the presence of Fdbisd, Redbisd, and NADH, was able to convert BPA. The Km and kcat values for BPA degradation were 85 ± 4.7 ?M and 3.9 ± 0.04 min?1, respectively. NADPH, spinach ferredoxin, and spinach ferredoxin reductase resulted in weak monooxygenase activity. These results indicated that the electron transport system of P450bisd might exhibit strict specificity. Two BPA degradation products of the P450bisd system were detected by high-performance liquid chromatography analysis and were thought to be 1,2-bis(4-hydroxyphenyl)-2-propanol and 2,2-bis(4-hydroxyphenyl)-1-propanol based on mass spectrometry-mass spectrometry analysis. This is the first report demonstrating that the cytochrome P450 monooxygenase system in bacteria is involved in BPA degradation.

Sasaki, Miho; Akahira, Ayako; Oshiman, Ko-ichi; Tsuchido, Tetsuaki; Matsumura, Yoshinobu

2005-01-01

143

MULTI-WAVELENGTH OBSERVATIONS OF BLAZAR AO 0235+164 IN THE 2008-2009 FLARING STATE  

SciTech Connect

The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuous coverage by Fermi, contemporaneous observations were carried out from the radio to {gamma}-ray bands between 2008 September and 2009 February. In this paper, we summarize the rich multi-wavelength data collected during the campaign (including F-GAMMA, GASP-WEBT, Kanata, OVRO, RXTE, SMARTS, Swift, and other instruments), examine the cross-correlation between the light curves measured in the different energy bands, and interpret the resulting spectral energy distributions in the context of well-known blazar emission models. We find that the {gamma}-ray activity is well correlated with a series of near-IR/optical flares, accompanied by an increase in the optical polarization degree. On the other hand, the X-ray light curve shows a distinct 20 day high state of unusually soft spectrum, which does not match the extrapolation of the optical/UV synchrotron spectrum. We tentatively interpret this feature as the bulk Compton emission by cold electrons contained in the jet, which requires an accretion disk corona with an effective covering factor of 19% at a distance of 100 R{sub g}. We model the broadband spectra with a leptonic model with external radiation dominated by the infrared emission from the dusty torus.

Ackermann, M. [Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany); Ajello, M.; Blandford, R. D.; Bloom, E. D.; Borgland, A. W.; Bottacini, E.; Buehler, R.; Cameron, R. A. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Ballet, J.; Casandjian, J. M. [Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France); Barbiellini, G. [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy); Bastieri, D.; Buson, S. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy); Bellazzini, R.; Bregeon, J. [Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy); Bonamente, E. [Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy); Brigida, M. [Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy); Bruel, P. [Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France); Caliandro, G. A. [Institut de Ciencies de l'Espai (IEEE-CSIC), Campus UAB, 08193 Barcelona (Spain); Caraveo, P. A., E-mail: eduardo@slac.stanford.edu, E-mail: madejski@slac.stanford.edu, E-mail: fabio.gargano@ba.infn.it, E-mail: silvia.raino@ba.infn.it, E-mail: lreyes04@calpoly.edu, E-mail: knalew@colorado.edu, E-mail: sikora@camk.edu.pl [INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano (Italy); Collaboration: Fermi-LAT Collaboration; GASP-WEBT consortium; F-GAMMA; Iram-PdBI; Kanata; RXTE; SMARTS; Swift-XRT; and others

2012-06-01

144

Since When or How Often? Dissociating the Roles of Age of Acquisition (AoA) and Lexical Frequency in Early Visual Word Processing  

ERIC Educational Resources Information Center

|The aim of the study was to investigate the effect of both word age of acquisition (AoA) and frequency of occurrence on the timing and topographical distribution of ERP components. The processing of early- versus late-acquired words was compared with that of high-frequency versus low-frequency words. Participants were asked to perform an…

Adorni, Roberta; Manfredi, Mirella; Proverbio, Alice Mado

2013-01-01

145

Volcanic activity of Io observed in December 2001 with the Keck AO system: 2-5mu m sunlit and eclipse observations  

Microsoft Academic Search

Volcanically active Io remains a mysterious and intriguing moon, despite numerous spacecraft flybys. Groundbased monitoring programs help characterize the time evolution of Io's volcanic activity, such as the frequency, spatial distribution and temperature of hot spots and outbursts. The satellite was observed intensively in December 2001 with the Keck II Adaptive Optics (AO) system and its recently installed near-infrared camera

F. Marchis; I. de Pater; D. Le Mignant; H. Roe; T. Fusco; J. R. Graham; R. Prange; B. Macintosh

2002-01-01

146

The coupling ion in the methanoarchaeal ATP synthases: H(+) vs. Na(+) in the A(1)A(o) ATP synthase from the archaeon Methanosarcina mazei Gö1.  

PubMed

To establish a system to analyze ATP synthesis by the archaeal A(1)A(o) ATP synthase and to address the nature of the coupling ion, the operon encoding the A(1)A(o) ATP synthase from the mesophile Methanosarcina mazei Gö1 was cloned in an expression vector and it was expressed in the F(1)F(o) ATP synthase-negative mutant Escherichia coli DK8. Western blot analyses revealed that each of the subunits was produced, and the subunits assembled to a functional, membrane-embedded ATP synthase/ATPase. ATP hydrolysis was inhibited by dicyclohexylcarbodiimide but also by tributyltin, which turned out to be the most efficient inhibitor of the A(o) domain of A(1)A(o) ATP synthase known to date. ATP hydrolysis was not dependent on the Na(+) concentration of the medium, and inhibition of the enzyme by dicyclohexylcarbodiimide could not be relieved by Na(+). The enzyme present in the cytoplasmic membrane of E. coli catalyzed ATP synthesis driven by an artificial DeltapH but not by DeltapNa or DeltamuNa(+). PMID:17986085

Pisa, Kim Y; Weidner, Claudia; Maischak, Heiko; Kavermann, Holger; Müller, Volker

2007-12-01

147

Since When or How Often? Dissociating the Roles of Age of Acquisition (AoA) and Lexical Frequency in Early Visual Word Processing  

ERIC Educational Resources Information Center

The aim of the study was to investigate the effect of both word age of acquisition (AoA) and frequency of occurrence on the timing and topographical distribution of ERP components. The processing of early- versus late-acquired words was compared with that of high-frequency versus low-frequency words. Participants were asked to perform an…

Adorni, Roberta; Manfredi, Mirella; Proverbio, Alice Mado

2013-01-01

148

Molecular dynamics evidence for alkali-metal rattling in the ?-pyrochlores, AOs2O6 (A = K, Rb, Cs).  

PubMed

We have used ab initio molecular dynamics simulations validated against inelastic neutron scattering data to study alkali-metal dynamics in the ?-pyrochlore osmates AOs2O6 (A=K, Rb, Cs) at 300 K to gain insight into the microscopic nature of rattling dynamics in these materials. Our results provide new evidence at the microscopic level for rattling dynamics: (1) the elemental magnitude spectra calculated from the MD show a striking dominance by the alkali metals at low energies indicating weak coupling to the cage, (2) the atomic root-mean-square displacements for the alkali metals are significantly larger than for the other atoms, e.g., 25% and 150% larger than O and Os, respectively, in KOs2O6, and (3) motions of the alkali metals are weakly correlated to the dynamics in their immediate environment, e.g. K in KOs2O6 is 6 times less sensitive to its local environment than Os, indicating weak bonding of the K. There is broadening of the elemental spectra of the alkali metals from Cs to K corresponding to a similar broadening of the local potential around these atoms as determined from potential of mean-force calculations. This feature of the spectra is partly explained by the well-known increase in the relative cage volume with decreasing atomic size of the alkali metal. We find that for the smallest rattler in this series (K) the larger relative cage volume allows this atom freedom to explore a large space inside the cage leading to vibration at a broader range of frequencies, hence a broader spectrum. Thus, since K is considered the best rattler in this series, these findings suggest that a significant feature of a good rattler is the ability to vibrate at several different but closely spaced frequencies. PMID:24172693

Shoko, E; Peterson, V K; Kearley, G J

2013-10-31

149

Climate change in the 21st century simulated by HadGEM2-AO under representative concentration pathways  

NASA Astrophysics Data System (ADS)

We present climate responses of Representative Concentration Pathways (RCPs) using the coupled climate model HadGEM2-AO for the Coupled Model Intercomparison Project phase 5 (CMIP5). The RCPs are selected as standard scenarios for the IPCC Fifth Assessment Report and these scenarios include time paths for emissions and concentrations of greenhouse gas and aerosols and land-use/land cover. The global average warming and precipitation increases for the last 20 years of the 21st century relative to the period 1986-2005 are +1.1°C/+2.1% for RCP2.6, +2.4°C/+4.0% for RCP4.5, +2.5°C/+3.3% for RCP6.0 and +4.1°C/+4.6% for RCP8.5, respectively. The climate response on RCP 2.6 scenario meets the UN Copenhagen Accord to limit global warming within two degrees at the end of 21st century, the mitigation effect is about 3°C between RCP2.6 and RCP8.5. The projected precipitation changes over the 21st century are expected to increase in tropical regions and at high latitudes, and decrease in subtropical regions associated with projected poleward expansions of the Hadley cell. Total soil moisture change is projected to decrease in northern hemisphere high latitudes and increase in central Africa and Asia whereas near-surface soil moisture tends to decrease in most areas according to the warming and evaporation increase. The trend and magnitude of future climate extremes are also projected to increase in proportion to radiative forcing of RCPs. For RCP 8.5, at the end of the summer season the Arctic is projected to be free of sea ice.

Baek, Hee-Jeong; Lee, Johan; Lee, Hyo-Shin; Hyun, Yu-Kyung; Cho, ChunHo; Kwon, Won-Tae; Marzin, Charline; Gan, Sun-Yeong; Kim, Min-Ji; Choi, Da-Hee; Lee, Jonghwa; Lee, Jaeho; Boo, Kyung-On; Kang, Hyun-Suk; Byun, Young-Hwa

2013-09-01

150

Deriving the true mass of an unresolved Brown Dwarf companion to an M-Dwarf with AO aided astrometry  

NASA Astrophysics Data System (ADS)

From radial velocity (RV) detections alone one does not get all orbital parameters needed to derive the true mass of a non-transiting, unresolved substellar companion to a star. Additional astrometric measurements are needed to calculate the inclination and the longitude of the ascending node. Until today only few true substellar companion masses have been determined by this method with the HST fine guidance sensor [1, 2]. We aim to derive the true mass of a brown dwarf candidate companion to an early M 2.5V dwarf with groundbased high-resolution astrometry aided by adaptive optics. We found this unique brown dwarf desert object, whose distance to the host star is only 0.42 AU, in our UVES precision RV survey of M dwarfs, inferring a minimum companion mass of 27 Jupiter masses [3]. Combining the data with HIPPARCOS astrometry, we found a probability of only 2.9% that the companion is stellar. We therefore observed the host star together with a reference star within a monitoring program with VLT/NACO to derive the true mass of the companion and establish its nature (brown dwarf vs. star). Simultaneous observations of a reference field in a globular cluster are performed to determine the stability of the adaptive optics (AO) plus detector system and check its suitability for such high-precision astrometric measurements over several epochs which are needed to find and analyse extrasolar planet systems. Based on observations collected at the European Southern Observatory, Paranal, Chile, programmes 381.C-0235, 281.C-5057 and 383.C-0248.

Meyer, E.; Kürster, M.

2011-07-01

151

Ferredoxin from sweet pepper (Capsicum annuum L.) intensifying harpin(pss)-mediated hypersensitive response shows an enhanced production of active oxygen species (AOS).  

PubMed

The hypersensitive response (HR) is a form of cell death associated with plant resistance to pathogen infection. Harpin(pss), an elicitor from the bacterium Pseudomonas syringae pv. syringae, induces a HR in non-host plants. Previously, we reported an amphipathic protein from sweet pepper interfering with harpin(pss)-mediated HR. In this report, we isolated and characterized a cDNA clone encoded that amphipathic protein from sweet pepper. This protein is designated as PFLP (plant ferredoxin-like protein) by virtue of its high homology with plant ferredoxin protein containing an N-terminal signal peptide responsible for chloroplast targeting and a putative 2Fe-2S domain responsible for redox activity. Recombinant PFLP obtained from Escherichia coli was able to significantly increase active oxygen species (AOS) generation when mixed with harpin(pss) in tobacco suspension cells. It also showed enhanced HR when co-infiltrated with harpin(pss) in tobacco leaves. We used a transgenic tobacco suspension cells system that constitutively expresses the Pflp gene driven by the CaMV 35S promoter to study the function of PFLP in enhancing harpin(pss)-mediated hypersensitive cell death in vivo. In response to harpin(pss), suspension cells derived from Pflp transgenic tobacco showed a significant increase both in the generation of AOS and in cell death as compared to the wild type. AOS inhibitors diphenylene iodonium chloride (DPI) and lanthanum chlorate (LaCl3) were used to study the involvement of AOS in harpin(pss)-induced cell death. Our results demonstrate enhanced generation of AOS is necessary to cause enhanced hypersensitive cell death in Pflp transgenic tobacco cells and it is plasma membrane-bound NADPH-oxidase-dependent. Sub-cellular localization studies showed that PFLP is present in the cytoplasm and chloroplast of Pflp transgenic tobacco cells, but only in the chloroplast, not in the cytoplasm, of wild-type tobacco cells. It is possible that PFLP can change the redox state of the cell upon harpin(pss) inoculation to increase AOS generation and hypersensitive cell death. Overall, this study will provide a new insight in the functional properties of ferredoxin in hypersensitive cell death. PMID:12777051

Dayakar, Badri Venkata; Lin, Hao-Jan; Chen, Cheng-Hsien; Ger, Mang-Jye; Lee, Bor-Heng; Pai, Chia-Hwei; Chow, David; Huang, Hsiang-En; Hwang, Shaw-Yhi; Chung, Mei-Chu; Feng, Teng-Yung

2003-04-01

152

HIGH-RESOLUTION IMAGES OF ORBITAL MOTION IN THE ORION TRAPEZIUM CLUSTER WITH THE LBT AO SYSTEM  

SciTech Connect

The new 8.4 m LBT adaptive secondary AO system, with its novel pyramid wavefront sensor, was used to produce very high Strehl ({approx}> 75% at 2.16 {mu}m) near-infrared narrowband (Br{gamma}: 2.16 {mu}m and [Fe II]: 1.64 {mu}m) images of 47 young ({approx}1 Myr) Orion Trapezium {theta}{sup 1} Ori cluster members. The inner {approx}41 Multiplication-Sign 53'' of the cluster was imaged at spatial resolutions of {approx}0.''050 (at 1.64 {mu}m). A combination of high spatial resolution and high S/N yielded relative binary positions to {approx}0.5 mas accuracies. Including previous speckle data, we analyze a 15 year baseline of high-resolution observations of this cluster. We are now sensitive to relative proper motions of just {approx}0.3 mas yr{sup -1} (0.6 km s{sup -1} at 450 pc); this is a {approx}7 Multiplication-Sign improvement in orbital velocity accuracy compared to previous efforts. We now detect clear orbital motions in the {theta}{sup 1} Ori B{sub 2} B{sub 3} system of 4.9 {+-} 0.3 km s{sup -1} and 7.2 {+-} 0.8 km s{sup -1} in the {theta}{sup 1} Ori A{sub 1} A{sub 2} system (with correlations of P.A. versus time at >99% confidence). All five members of the {theta}{sup 1} Ori B system appear likely a gravitationally bound 'mini-cluster'. The very lowest mass member of the {theta}{sup 1} Ori B system (B{sub 4}; mass {approx}0.2 M{sub Sun }) has, for the first time, a clearly detected motion (at 4.3 {+-} 2.0 km s{sup -1}; correlation = 99.7%) w.r.t. B{sub 1}. However, B{sub 4} is most likely in a long-term unstable (non-hierarchical) orbit and may 'soon' be ejected from this 'mini-cluster'. This 'ejection' process could play a major role in the formation of low-mass stars and brown dwarfs.

Close, L. M.; Males, J. R.; Skemer, A.; McCarthy, D. W.; Xompero, M.; Kulesa, C. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Puglisi, A.; Busoni, L.; Pinna, E.; Riccardi, A.; Quiros-Pacheco, F.; Argomedo, J.; Esposito, S.; Mannucci, F. [INAF-Osservatorio Astrofisico di Arcetri, I-50125 Firenze (Italy); Arcidiacono, C. [INAF-Osservatorio Astronomico di Bologna, I-40127 Bologna (Italy); Guerra, J. C.; Brusa, G.; Miller, D. L.; Brynnel, J.; Boutsia, K., E-mail: lclose@as.arizona.edu [LBT Observatory, University of Arizona, Tucson, AZ 85721 (United States); and others

2012-04-20

153

High-resolution Images of Orbital Motion in the Orion Trapezium Cluster with the LBT AO System  

NASA Astrophysics Data System (ADS)

The new 8.4 m LBT adaptive secondary AO system, with its novel pyramid wavefront sensor, was used to produce very high Strehl (gsim 75% at 2.16 ?m) near-infrared narrowband (Br?: 2.16 ?m and [Fe II]: 1.64 ?m) images of 47 young (~1 Myr) Orion Trapezium ?1 Ori cluster members. The inner ~41 × 53'' of the cluster was imaged at spatial resolutions of ~0farcs050 (at 1.64 ?m). A combination of high spatial resolution and high S/N yielded relative binary positions to ~0.5 mas accuracies. Including previous speckle data, we analyze a 15 year baseline of high-resolution observations of this cluster. We are now sensitive to relative proper motions of just ~0.3 mas yr-1 (0.6 km s-1 at 450 pc); this is a ~7 × improvement in orbital velocity accuracy compared to previous efforts. We now detect clear orbital motions in the ?1 Ori B 2 B 3 system of 4.9 ± 0.3 km s-1 and 7.2 ± 0.8 km s-1 in the ?1 Ori A 1 A 2 system (with correlations of P.A. versus time at >99% confidence). All five members of the ?1 Ori B system appear likely a gravitationally bound "mini-cluster." The very lowest mass member of the ?1 Ori B system (B 4; mass ~0.2 M ?) has, for the first time, a clearly detected motion (at 4.3 ± 2.0 km s-1 correlation = 99.7%) w.r.t. B 1. However, B 4 is most likely in a long-term unstable (non-hierarchical) orbit and may "soon" be ejected from this "mini-cluster." This "ejection" process could play a major role in the formation of low-mass stars and brown dwarfs. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are: The University of Arizona on behalf of the Arizona University system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota and University of Virginia.

Close, L. M.; Puglisi, A.; Males, J. R.; Arcidiacono, C.; Skemer, A.; Guerra, J. C.; Busoni, L.; Brusa, G.; Pinna, E.; Miller, D. L.; Riccardi, A.; McCarthy, D. W.; Xompero, M.; Kulesa, C.; Quiros-Pacheco, F.; Argomedo, J.; Brynnel, J.; Esposito, S.; Mannucci, F.; Boutsia, K.; Fini, L.; Thompson, D. J.; Hill, J. M.; Woodward, C. E.; Briguglio, R.; Rodigas, T. J.; Briguglio, R.; Stefanini, P.; Agapito, G.; Hinz, P.; Follette, K.; Green, R.

2012-04-01

154

Study of the blazar AO 0235+164 during the multi-wavelength observation period from October 2008 to February 2009  

NASA Astrophysics Data System (ADS)

AO 0235+164 is one of the most studied and monitored BL Lac objects in the sky. Since the launch of Fermi, the source has been monitored in the gamma-ray band by Fermi Large Area Telescope. Starting in October 2008, AO 0235+164 showed an increasing activity in gamma-rays that led to a multi-wavelength campaign with instruments in the radio, near-infrared, optical, UV and X-ray bands. We present here the results of the analysis of the multi-wavelength data collected during the flaring period: the high variability properties of this source and the SED built from radio frequencies to gamma-rays are shown, and are interpreted in the context of well-known blazar emission models [Ackermann, M. et al. 2012, ApJ 751, 159].

Rainò, S.; Madejski, G.; do Couto e Silva, E.; Gargano, F.; Reyes, L.; Nalewajko, K.; Sikora, M.

2013-06-01

155

Site symmetry of AO{sub 4} complexes (A are s- or p-elements of periods III and IV) in crystal structures  

SciTech Connect

The symmetry of the sites occupied in crystal structures by 17 405 crystallographically different A atoms (A are s or p elements of periods III and IV) entering the composition of AO{sub 4}{sup z-} complexes has been analyzed. A periodicity in the ability of A atoms for implementing a certain site symmetry is established. Some features of the stereochemistry of A elements in the dependence of their position in the periodic table are discussed.

Serezhkin, V. N., E-mail: serezhkin@ssu.samara.ru; Savchenkov, A. V. [Samara State University (Russian Federation); Urusov, V. S. [Moscow State University (Russian Federation)

2010-03-15

156

On the Location of the gamma-Ray Outburst Emission in the BL Lacertae Object AO 0235+164 Through Observations Across the Electromagnetic Spectrum  

Microsoft Academic Search

We present observations of a major outburst at centimeter, millimeter, optical, X-ray, and gamma-ray wavelengths of the BL Lacertae object AO 0235+164. We analyze the timing of multi-waveband variations in the flux and linear polarization, as well as changes in Very Long Baseline Array images at lambda = 7 mm with ~0.15 milliarcsec resolution. The association of the events at

Iván Agudo; Alan P. Marscher; Svetlana G. Jorstad; Valeri M. Larionov; José L. Gómez; Anne Lähteenmäki; Paul S. Smith; Kari Nilsson; Anthony C. S. Readhead; Margo F. Aller; Jochen Heidt; Mark Gurwell; Clemens Thum; Ann E. Wehrle; Maria G. Nikolashvili; Hugh D. Aller; Erika Benítez; Dmitriy A. Blinov; Vladimir A. Hagen-Thorn; David Hiriart; Buell T. Jannuzi; Manasvita Joshi; Givi N. Kimeridze; Omar M. Kurtanidze; Sofia O. Kurtanidze; Elina Lindfors; Sol N. Molina; Daria A. Morozova; Elina Nieppola; Alice R. Olmstead; Riho Reinthal; Mar Roca-Sogorb; Gary D. Schmidt; Lorand A. Sigua; Aimo Sillanpää; Leo Takalo; Brian Taylor; Merja Tornikoski; Ivan S. Troitsky; Alma C. Zook; Helmut Wiesemeyer

2011-01-01

157

Getting lucky with adaptive optics: diffraction-limited resolution in the visible with current AO systems on large and small telescopes  

Microsoft Academic Search

We have recently demonstrated diffraction-limited resolution imaging in the visible on the 5m Palomar Hale telescope. The new LAMP instrument is a Lucky Imaging backend camera for the Palomar AO system. Typical resolutions of 35-40 mas with Strehls of 10-20% were achieved at 700nm, and at 500nm the FWHM resolution was as small as 42 milliarcseconds. In this paper we

N. M. Law; R. G. Dekany; C. D. Mackay; A. M. Moore; M. C. Britton; V. Velur

2008-01-01

158

Getting lucky with adaptive optics: di! raction-limited resolution in the visible with current AO systems on large and small telescopes  

Microsoft Academic Search

We have recently demonstrated di! raction-limited resolution imaging in the visible on the 5m Palomar Hale telescope. The new LAMP instrument is a Lucky Imaging backend camera for the Palomar AO system. Typical resolutions of 35-40 mas with Strehls of 10-20% were achieved at 700nm, and at 500nm the FWHM resolution was as small as 42 milliarcseconds. In this paper

N. M. Law; R. G. Dekany; A. M. Moore; V. Velur

159

Integrate Remote Sensing and GIS: a primary study of adding remotely sensed image processing functions to ArcGIS8.3 using Matlab COM Builder and AO  

Microsoft Academic Search

This paper systematically introduces the practice of adding remotely sensed image processing functions to ArcGIS8.3 using Matlab COM Builder and AO. We also compare the performance of our system with that of the proprietary RS software ERDAS IMAGE8.5. The performance of our system is a bit lower than ERDAS IMAGINE, but the availability of power functions, the high efficient development

Shaobo Zhong; Yong Xue; Jianqin Wang; Yincui Hu; Ying Luo; Guoyin Cai; Shuhua Qi

2006-01-01

160

Infrared-absorption and photoinduced-absorption spectroscopy of semiconducting YBa2Cu3 AO6+x (A=16 and 18; 0<=x<=0.3)  

Microsoft Academic Search

We report the infrared (ir) absorption and photoinduced absorption (PA) spectra of semiconducting YBa2Cu3 AO6+x for A=16 and 18 and for 0<=x<=0.3. We observe ten ir absorption modes for x=0.3 and report the first observation for all 11 allowed ir modes for x=0.0. The ir modes for x=0.0 and x=0.3 are nearly the same. Shifts of the ir modes with

H. J. Ye; R. P. McCall; W. E. Farneth; E. M. McCarron III; A. J. Epstein

1991-01-01

161

Baculiferins A–O, O-sulfated pyrrole alkaloids with anti-HIV-1 activity, from the Chinese marine sponge Iotrochota baculifera  

Microsoft Academic Search

Fifteen new DOPA-derived pyrrole alkaloids, named baculiferins A–O (2–16), were isolated from the Chinese marine sponge Iotrochota baculifera, together with the known alkaloids purpurone (1) and ningalin A (17). Most of the new compounds contain one to three O-sulfate units. Their structures were determined by extensive spectroscopic analysis including 1H and 13C NMR (COSY, HMQC, HMBC) and ESIMS data. A

Guotao Fan; Zelin Li; Shi Shen; Yi Zeng; Yishu Yang; Minjuang Xu; Torsten Bruhn; Heike Bruhn; Joachim Morschhäuser; Gerhard Bringmann; Wenhan Lin

2010-01-01

162

Susceptibility to Antibiotics of Vibrio sp. AO1 Growing in Pure Culture or in Association with its Hydroid Host Aglaophenia octodonta (Cnidaria, Hydrozoa)  

Microsoft Academic Search

Vibrio harveyi is the major causal organism of vibriosis, causing potential devastation to diverse ranges of marine invertebrates over a\\u000a wide geographical area. These microorganisms, however, are phenotypically diverse, and many of the isolates are also resistant\\u000a to multiple antibiotics. In a previous study, we described a previously unknown association between Vibrio sp. AO1, a luminous bacterium related to the

Loredana Stabili; Cinzia Gravili; Ferdinando Boero; Salvatore M. Tredici; Pietro Alifano

2010-01-01

163

Identification of a copper-responsive promoter and development of a copper biosensor in the soil bacterium Achromobacter sp. AO22.  

PubMed

A number of human activities result in environmental contamination with copper compounds that can cause severe detrimental effects on the ecosystem as well as human health. The physico-chemical methods of metal detection have limitations such as inability to distinguish between total versus bio-available metals and differences in metal uptake in different organisms. The heavy metal resistance-encoding genetic systems of certain bacteria provide critical tools for development of biosensors for these purposes. This study reports a copper biosensor utilizing the cop operon of the heavy metal resistant bacterial isolate, Achromobacter sp. AO22, isolated from a contaminated site in Australia. A section located between the divergently transcribed putative response regulator gene copR and multicopper oxidase gene copA that included a palindromic cop box was identified as a copper-responsive promoter using a lacZ reporter construct, pCOPRP, in E. coli. The expression was found to be enhanced by inclusion of copR. Another engineered strain, AO22(pCOPRP), showed stronger induction, and the lacZ expression in both backgrounds was enhanced significantly (250-400 fold) by copper but minimally by other metals. The construct in Achromobacter sp. AO22 thus has a high potential as biosensor for detecting copper bioavailability (hence potential toxicity) in a soil bacterial background, while the construct in E. coli is ideal for laboratory-based testing. PMID:22806045

Ng, Shee Ping; Palombo, Enzo A; Bhave, Mrinal

2012-03-06

164

Diffraction-limited Visible Light Images of Orion Trapezium Cluster with the Magellan Adaptive Secondary Adaptive Optics System (MagAO)  

NASA Astrophysics Data System (ADS)

We utilized the new high-order (250-378 mode) Magellan Adaptive Optics system (MagAO) to obtain very high spatial resolution observations in "visible light" with MagAO's VisAO CCD camera. In the good-median seeing conditions of Magellan (0.''5-0.''7), we find MagAO delivers individual short exposure images as good as 19 mas optical resolution. Due to telescope vibrations, long exposure (60 s) r' (0.63 ?m) images are slightly coarser at FWHM = 23-29 mas (Strehl ~28%) with bright (R < 9 mag) guide stars. These are the highest resolution filled-aperture images published to date. Images of the young (~1 Myr) Orion Trapezium ?1 Ori A, B, and C cluster members were obtained with VisAO. In particular, the 32 mas binary ?1 Ori C 1 C 2 was easily resolved in non-interferometric images for the first time. The relative positions of the bright trapezium binary stars were measured with ~0.6-5 mas accuracy. We are now sensitive to relative proper motions of just ~0.2 mas yr-1 (~0.4 km s-1 at 414 pc)—this is a ~2-10 × improvement in orbital velocity accuracy compared to previous efforts. For the first time, we see clear motion of the barycenter of ?1 Ori B 2 B 3 about ?1 Ori B 1. All five members of the ?1 Ori B system appear likely to be a gravitationally bound "mini cluster," but we find that not all the orbits can be both circular and co-planar. The lowest mass member of the ?1 Ori B system (B 4; mass ~0.2 M ?) has a very clearly detected motion (at 4.1 ± 1.3 km s-1 correlation = 99.9%) w.r.t. B 1. Previous work has suggested that B 4 and B 3 are on long-term unstable orbits and will be ejected from this "mini cluster." However, our new "baseline" model of the ?1 Ori B system suggests a more hierarchical system than previously thought, and so the ejection of B 4 may not occur for many orbits, and B 3 may be stable against ejection in the long-term. This "ejection" process of the lowest mass member of a "mini cluster" could play a major role in the formation of low-mass stars and brown dwarfs. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

Close, L. M.; Males, J. R.; Morzinski, K.; Kopon, D.; Follette, K.; Rodigas, T. J.; Hinz, P.; Wu, Y.-L.; Puglisi, A.; Esposito, S.; Riccardi, A.; Pinna, E.; Xompero, M.; Briguglio, R.; Uomoto, A.; Hare, T.

2013-09-01

165

Translation between the Neer- and the AO/OTA-classification for proximal humeral fractures: do we need to be bilingual to interpret the scientific literature?  

PubMed Central

Background The reporting and interpretation of data from clinical trials of proximal humeral fractures are hampered by the use of two partly incommensurable fracture classification systems: the Neer classification and the AO/OTA classification. It remains difficult to interpret and generalize results, to conduct prognostic studies, and to obtain consensus on treatment recommendations when concise definitions and a common ‘fracture language’ are lacking. Thus, we compared both classifications systems using primary data from large clinical studies to assess how thoroughly both systems conveyed clinically important classification information. Methods Classification data from each study were organized in a cross-table covering the 432 theoretically possible combinations between the 16 Neer categories and the 27 AO/OTA subgroups, and the plausibility of all observed combinations were assessed and discussed by the authors until consensus. Results We analyzed primary data from 2530 observations from seven studies providing primary data from both classification systems. Thirty-five percent (151 out of 432) of the combinations were considered ‘not plausible’ and thirty-four percent (149 out of 432) were considered ‘problematic’. Conclusions Clinically important information was lost within both classification systems. Most important, the varus/valgus distinction was not found within the Neer classification and a clear definition of displacement was lacking in the AO/OTA classification. We encourage surgeons and researches to report data from both classification systems for a more thorough description of the fracture patterns and to enable cross-checking of the coding. A suitable table for cross-checking of the coding is provided herein.

2013-01-01

166

Competitive Contribution of Catalyst and Adsorption Roles of TiO2 on the Degradation of AO7 Dye During Plasma Treatment  

NASA Astrophysics Data System (ADS)

In order to investigate the role of TiO2 during plasma treatment, the degradation of the dye AO7 has been studied by gliding arc discharge in the presence of a TiO2 catalyst (CGAD). The results revealed that the adsorption of the dye on TiO2 is a physical adsorption in accordance with Langmuir isotherm, with a constant of adsorption KL = 0.52 mg/L and a maximum adsorption capacity b = 18.1 mg/g. The temperature variation of the reaction medium made it possible to consider thermodynamic parameters. Indeed, the adsorption is exothermic (enthalpy: ?H < 0), and spontaneous (free enthalpy: ?G < 0). The negative entropy (?S < 0) confirms the affinity of the dye molecules for TiO2. 20 min of CGAD treatment in the presence of an optimal quantity of TiO2 (2 g/L enabled us to bleach the solution of AO7 (100 ?M) completely. The discoloration rate with and without the addition of TiO2 was 100% and 28%, respectively. 40 additional minutes of treatment allowed a total abatement of the chemical oxygen demand. The elimination of AO7 molecules during the plasma-catalytic treatment follows Langmuir-Hinshelwood (L-H) model kinetics. According to this model, the speed constant is kr = 14.97 mg · L-1 · min-1 and the adsorption coefficient is KL—H = 0.010 L/mg. The latter being negligible compared to kr, adsorption is therefore weakly performed during the plasma treatment.

Nabila, Haddou; Mouffok Redounae, Ghezzar; Fatiha, Abdelmalek; Stephanie, Ognier; Ahmed, Addou

2013-09-01

167

Amorphization of Al[sub 6]Mn phase in an Al-14 a/o Mn alloy during low energy helium ion bombardment  

SciTech Connect

Amorphization of ordered intermetallic compounds has been observed during ion, electron and neutron irradiations. Investigations have been carried out in a number of systems. It has been generally observed that intermetallic compounds with a narrow range of homogeneity (line compounds) amorphize on irradiation. The present paper reports the observation of irradiation-induced amorphization in the Al[sub 6]Mn phase in an Al-14 a/o Mn alloy. The dose and energy dependence of the amorphization process are discussed. The present studies suggest that the defects produced during irradiation rather than the implanted atoms (helium) play a major role in the crystalline to amorphous transition.

Nair, K.G.M.; Krishan, K. (Indira Gandhi Centre for Atomic Research, Tamil Nadu (India). Materials Science Division); Vijayalakshmi, M. (Indira Gandhi Centre for Atomic Research, Tamil Nadu (India). Metallurgy Division)

1993-10-01

168

Ao38, a new cell line from eggs of the black witch moth, Ascalapha odorata (Lepidoptera: Noctuidae), is permissive for AcMNPV infection and produces high levels of recombinant proteins  

PubMed Central

Background The insect cell line is a critical component in the production of recombinant proteins in the baculovirus expression system and new cell lines hold the promise of increasing both quantity and quality of protein production. Results Seventy cell lines were established by single-cell cloning from a primary culture of cells derived from eggs of the black witch moth (Ascalapha odorata; Lepidoptera, Noctuidae). Among 8 rapidly growing lines, cell line 38 (Ao38) was selected for further analysis, based on susceptibility to AcMNPV infection and production of secreted alkaline phosphatase (SEAP) from a baculovirus expression vector. In comparisons with low-passage High Five (BTI-Tn-5B1-4) cells, infected Ao38 cells produced ?-galactosidase and SEAP at levels higher (153% and 150%, respectively) than those measured from High Five cells. Analysis of N-glycans of SEAP produced in Ao38 cells revealed two N-glycosylation sites and glycosylation patterns similar to those reported for High Five and Sf9 cells. Glycopeptide isoforms consisted of pauci- or oligomannose, with and without fucose on N-acetylglucosamine(s) linked to asparagine residues. Estimates of Ao38 cell volume suggest that Ao38 cells are approximately 2.5× larger than Sf9 cells but only approximately 74% of the size of High Five cells. Ao38 cells were highly susceptible to AcMNPV infection, similar to infectivity of Sf9 cells. Production of infectious AcMNPV budded virions from Ao38 cells peaked at approximately 4.5 × 107 IU/ml, exceeding that from High Five cells while lower than that from Sf9 cells. Ao38 cells grew rapidly in stationary culture with a population doubling time of 20.2 hr, and Ao38 cells were readily adapted to serum-free medium (Sf-900III) and to a suspension culture system. Analysis of Ao38 and a parental Ascalapha odorata cell line indicated that these lines were free of the alphanodavirus that was recently identified as an adventitious agent in High Five cell lines. Conclusions Ao38 cells represent a highly productive new insect cell line that will be useful for heterologous protein expression and other applications in biotechnology.

2010-01-01

169

Anthogorgienes A-O, new guaiazulene-derived terpenoids from a Chinese gorgonian Anthogorgia species, and their antifouling and antibiotic activities.  

PubMed

Fifteen new guaiazulene-based terpenoids designated anthogorgienes A-O (1-15) were isolated from a Chinese gorgonian Anthogorgia sp., together with eight known analogues (16-23). The structural patterns were classified into monomers, dimers, and trimers, which were supposed to be generated from a precursor guaiazulene and followed by side-chain and nucleus oxidation and oxidative rearrangement. The structures of new compounds were elucidated on the basis of extensive spectroscopic (IR, MS, and 1D and 2D NMR) data analysis. A possible biogenetic relationship of the isolated compounds was postulated. Some of the compounds showed potent antifouling activities against the larval settlement of barnacle Balanus amphitrite , whereas their antibiotic activities were also evaluated. PMID:22148226

Chen, Dawei; Yu, Shanjiang; van Ofwegen, Leen; Proksch, Peter; Lin, Wenhan

2011-12-22

170

Nearly Periodic Fluctuations in the Long-term X-Ray Light Curves of the Blazars AO 0235+164 and 1ES 2321+419  

NASA Astrophysics Data System (ADS)

We have performed a structure function analysis of the Rossi X-Ray Timing Explorer All-Sky Monitor data to search for variability in 24 blazars using data trains that each exceed 12 yr. Although 20 of them show nominal periods through this technique, the great majority of these "periods" are clearly related to yearly variations arising from the instrument. Nonetheless, an apparently real periodic component of about 17 days was detected for the blazar AO 0235+164 and it was confirmed by discrete correlation function and periodogram analyses. For 1ES 2321+419, a component of variability with a near periodicity of about 420 days was detected by all of these methods. We discuss several possible explanations for these nearly periodic components and conclude that they most likely arise from the intersections of a shock propagating down a relativistic jet that possesses a helical structure.

Rani, Bindu; Wiita, Paul J.; Gupta, Alok C.

2009-05-01

171

Levels, composition profiles and sources of polycyclic aromatic hydrocarbons in surface sediments from Nan'ao Island, a representative mariculture base in South China.  

PubMed

Levels, composition profiles and sources of 16 polycyclic aromatic hydrocarbons (PAHs) in surface sediments from Nan'ao Island, one of the largest mariculture bases in South China were investigated. The total PAHs concentrations ranged from 265.49 to 951.27ng/g (dry weight) with a mean of 515.90ng/g, and seven possible carcinogenic PAHs accounted for 76.94% of total PAHs. Among various mariculture sections, the highest PAHs level was found in the large seaweed culture; while the lowest concentration was detected in the abandoned culture. The composition of PAHs was characterized by low molecular weight PAHs, and Phe Ant and Pyr were the dominant constituent. PAHs may be mainly originated from petroleum and combustion of biomass and coal. Risk assessments suggested that the probability of adverse effect was lower than 25% and PAHs exposure was moderately carcinogenic. PMID:23941805

Gu, Yang-Guang; Lin, Qin; Lu, Teng-Teng; Ke, Chang-Liang; Sun, Run-Xia; Du, Fei-Yan

2013-08-12

172

Characteristics of sodium guidestars created by the 50-watt FASOR and first closed-loop AO results at the Starfire Optical Range  

NASA Astrophysics Data System (ADS)

A computer-automated cw sodium guidestar FASOR (Frequency Addition Source of Optical Radiation) producing a single frequency 589-nm beam with up to 50 W for mesospheric beacon generation has been integrated with the 3.5-m telescope at the Starfire Optical Range, Kirtland AFB, New Mexico. Radiance tests have produced a peak guidestar V1 magnitude = 5.1 (~7000 photons/s/cm2 at zenith) for 30 W of circularly polarized pump power in November 2005. Estimated theoretical maximum guidestar radiance is about 3 times greater than measured values indicating saturation due to atoms possibly becoming trapped in F'=1 and/or atomic recoil. From sky tests over 3.5 years, we have tracked the annual variation of the sodium column density by measuring the return flux as a function of fasor power and determining the slope at zero power. The maximum occurs on October 30 and the minimum on May 30, with corresponding predicted returns of 8000 (V1 = 4.8) and 3000 (V1 = 5.8) ph/s/cm2 with 50 W of fasor power and circular polarization. The effect of the Earth's magnetic field on the radiance of the sodium laser guidestar (LGS) from various azimuths and elevations has been measured. The peak return flux over our observatory occurs at [az=198o; el=+71o], compared with the direction of the magnetic field lines at [190o; +62o], and it can vary by a factor of 3 over the sky above el = 30o. First results for non-optimized sodium LGS adaptive optics (AO) closed-loop operation have been obtained using binary stars. Strehl ratios of 0.03 have been measured at 850 nm and a 0.14 arc second binary star has been resolved during first closed loop observations. Guidestar characteristics, including radiance, size, and Rayleigh backscatter, the sodium LGS wavefront sensor (WFS) AO system, and recent closed-loop results on binary stars are presented.

Denman, Craig A.; Drummond, Jack D.; Eickhoff, Mark L.; Fugate, Robert Q.; Hillman, Paul D.; Novotny, Steven J.; Telle, John M.

2006-07-01

173

Improvement of laser characteristics for diode-pumped passively Q-switched and mode-locked Nd:Lu0.15Y0.85VO4 laser by AO modulator  

NASA Astrophysics Data System (ADS)

The hybrid Q-switched and mode-locked (QML) operation of Nd:Lu0.15Y0.85VO4 crystal at 1.34 ?m with V:YAG saturable absorber and acousto-optic (AO) modulator has been realized. The laser characteristics are distinctly improved by the hybrid QML if compared to those with the single V:YAG QML. At the pump power of 5.04 W, the Q-switched pulse energy is enlarged to 5.6 times and the Q-switched pulse width is shortened to 40% by the AO modulator in contrast to those of the single passively QML.

Li, X.; Li, G. Q.; Zhao, S. Z.; Zhao, B.; Li, Y. F.; Yin, L.; Wang, X. M.

2012-12-01

174

Effect of aeration rate on the emission of N2O in anoxic-aerobic sequencing batch reactors (A/O SBRs).  

PubMed

Nitrous oxide (N(2)O) is a significant greenhouse gas, and biological nitrogen removal systems have been shown to be a significant N(2)O source. To evaluate the control parameters for N(2)O emission in the wastewater treatment process, N(2)O emissions were compared in the activated sludge from anoxic-aerobic sequencing batch reactors (A/O SBRs) acclimated under different aeration rates, and fed with synthetic wastewater. Results showed that a higher aeration rate led to a smaller N(2)O emission, while reactors acclimated under mild aeration performed the best in terms of nitrogen removal efficiency. Most of the N(2)O was produced during the aerobic phase, regardless of the aeration rate. Trace studies showed that incomplete denitrification appeared to be the major process responsible for high N(2)O emission at a low aeration rate (Run 1), while incomplete nitrification was the reason for N(2)O emission at a higher aeration rate (Run 2 and Run 3). For enhancing the efficiency of nitrogen removal while lowering energy consumption and reducing N(2)O emission, the optimal aeration rate would be 2.7 L(air)/(L(reactor) . h), in terms of the synthetic wastewater used. PMID:20347772

Hu, Zhen; Zhang, Jian; Li, Shanping; Xie, Huijun; Wang, Jinhe; Zhang, Tingting; Li, Yiran; Zhang, Huayong

2009-12-02

175

Superfund explanation of significant difference for the record of decision (EPA region 2): A.O. Polymer, Sparta Township, NJ, September 17, 1996  

SciTech Connect

The Record of Decision (ROD) for the A.O. Polymer Superfund Site (the Site), signed on June 28, 1991, called for the use of a soil vapor extraction system to remove contaminants from the soils that act as the source of groundwater contamination. The groundwater component of the ROD called for extraction of the contaminated groundwater, treatment with a powdered activated carbon treatment (PACT) system, and discharge of the treated water back into the groundwater aquifer. Results from a treatability study performed on the PACT system with groundwater taken from the Site indicate that the effluent from the PACT system exceeds the surface water discharge limitations. In addition, information gathered since the issuance of the ROD has shown that the aquifer does not have sufficient capacity to accept the treatment system effluent without adversely affecting the groundwater plume and surrounding properties. Therefore, the treated groundwater will be discharged to the Wallkill River located 500 feet southeast of the Site. Further, air stripping will be used instead of PACT to remove contaminants from the groundwater.

NONE

1997-03-01

176

Separation, characterization and dose-effect relationship of the PPARgamma-activating bio-active constituents in the Chinese herb formulation 'San-Ao decoction'.  

PubMed

San-ao decoction (SAD), comprising Herba Ephedrae, Radix et Rhizoma Glycyrrhizae and Seneb Armeniacae Amarum, is one of the most popular traditional Chinese medicine (TCM) formulae for asthma. Peroxisome proliferator-activated receptors (PPARs) areey regulators of lipid and glucose metabolism and have become important therapeutic targets for various deseases, PPARgamma activation might exhibit anti-inflammatory properties in different chronic inflammatory processes. The EtOAc fraction of SAD showed a significant effect on PPARgamma activation. A simple and rapid method has been established for separation and characterization of the main compounds in the PPARgamma-activating fraction of SAD by ultra-fast HPLC coupled with quadropole time-of-flight mass pectrometry (UPLC-Q-TOF/MS). A total of 10 compounds were identified in the activating fraction of SAD, including amygdalin (1), liquiritin (2), 6'-acetyliquiritin (3), liquiritigenin (4), isoliquiritigenin (5), formononetin (6), licoisoflavanone (7), glycycoumarin (8), glycyrol (9) and uercetin (10). The results also characterized formononetin as a predominant component in this fraction. The dose-effect relationship comparison study of formononetin and the EtOAc fraction of SAD by adding formononetin was performed, the results suggested that formononetin was the major component of the EtOAc fraction of SAD responsible for activating PPARgamma, and the method will possibly be applied to study the complex biological active constituents of other TCMs. PMID:19924040

Zhou, Ling; Tang, Yu-Ping; Gao, Lu; Fan, Xin-Sheng; Liu, Chun-Mei; Wu, De-Kang

2009-10-09

177

ON THE LOCATION OF THE {gamma}-RAY OUTBURST EMISSION IN THE BL LACERTAE OBJECT AO 0235+164 THROUGH OBSERVATIONS ACROSS THE ELECTROMAGNETIC SPECTRUM  

SciTech Connect

We present observations of a major outburst at centimeter, millimeter, optical, X-ray, and {gamma}-ray wavelengths of the BL Lacertae object AO 0235+164. We analyze the timing of multi-waveband variations in the flux and linear polarization, as well as changes in Very Long Baseline Array images at {lambda} = 7 mm with {approx}0.15 milliarcsec resolution. The association of the events at different wavebands is confirmed at high statistical significance by probability arguments and Monte Carlo simulations. A series of sharp peaks in optical linear polarization, as well as a pronounced maximum in the 7 mm polarization of a superluminal jet knot, indicate rapid fluctuations in the degree of ordering of the magnetic field. These results lead us to conclude that the outburst occurred in the jet both in the quasi-stationary 'core' and in the superluminal knot, both parsecs downstream of the supermassive black hole. We interpret the outburst as a consequence of the propagation of a disturbance, elongated along the line of sight by light-travel time delays, that passes through a standing recollimation shock in the core and propagates down the jet to create the superluminal knot. The multi-wavelength light curves vary together on long timescales (months/years), but the correspondence is poorer on shorter timescales. This, as well as the variability of the polarization and the dual location of the outburst, agrees with the expectations of a multi-zone emission model in which turbulence plays a major role in modulating the synchrotron and inverse Compton fluxes.

Agudo, Ivan; Gomez, Jose L. [Instituto de Astrofisica de Andalucia, CSIC, Apartado 3004, 18080 Granada (Spain); Marscher, Alan P.; Jorstad, Svetlana G. [Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States); Larionov, Valeri M.; Blinov, Dmitriy A.; Hagen-Thorn, Vladimir A. [Astronomical Institute, St. Petersburg State University, Universitetskij Pr. 28, Petrodvorets, 198504 St. Petersburg (Russian Federation); Laehteenmaeki, Anne [Aalto University Metsaehovi Radio Observatory, Metsaehovintie 114, FIN-02540 Kylmaelae (Finland); Smith, Paul S. [Steward Observatory, University of Arizona, Tucson, AZ 85721-0065 (United States); Nilsson, Kari [Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Vaeisaelaentie 20, FIN-21500 Piikkioe (Finland); Readhead, Anthony C. S. [Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Mail Code 222, Pasadena, CA 91125 (United States); Aller, Margo F.; Aller, Hugh D. [Department of Astronomy, University of Michigan, 817 Dennison Building, Ann Arbor, MI 48 109 (United States); Heidt, Jochen [ZAH, Landessternwarte Heidelberg, Koenigstuhl, 69117 Heidelberg (Germany); Gurwell, Mark [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States); Thum, Clemens [Institut de Radio Astronomie Millimetrique, 300 Rue de la Piscine, 38406 St. Martin d'Heres (France); Wehrle, Ann E. [Space Science Institute, Boulder, CO 80301 (United States); Nikolashvili, Maria G. [Abastumani Observatory, Mt. Kanobili, 0301 Abastumani, Georgia (United States); BenItez, Erika [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, 04510 Mexico D. F. (Mexico); Hiriart, David, E-mail: iagudo@iaa.es [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, 2280 Ensenada (Mexico)

2011-07-01

178

Using UPLC-QTOF-MS to Analyze the Chemical Changes between Traditional and Dispensing Granule Decoctions of San-Ao-Tang.  

PubMed

In the present study, a chemical profiling approach based on ultra-performance liquid chromatography coupled with photodiode array detection and time-of-flight mass spectrometry (UPLC-PDA-TOF-MS) was proposed to rapidly evaluate the chemical consistency between traditional and dispensing granule decoctions of traditional medicine combinatorial formulae and validated using San-Ao-Tang (SAT) as a model combinatorial formula. SAT is an effective traditional Chinese medicine, which is usually used in treating asthma and other diseases of the respiratory system. Two decoctions were prepared: traditional decoction, which is a water extract of three mixed constituent herbs of SAT; and dispensing granule decoction, which is a mixed water extract of each individual herb of SAT. Batches of these two decoction samples were subjected to UPLC-PDA-TOF-MS analysis and the data sets of tR-m/z pairs, ion intensities and sample codes were processed with supervised orthogonal partial least squared discriminant analysis to holistically compare their differences. Once a clear classification trend was found in the score plot, further statistics were performed to generate points at the two ends of S, and the components that correlated to these ions were regarded as the most changed components during decoction of the combinatorial formula. The changed components were identified by comparing the mass/ultraviolet spectra and retention times with those of reference compounds and/or tentatively assigned by matching empirical molecular formulae with those of the known compounds published in the literature. Using the proposed approach, global chemical differences were found between traditional and dispensing granule decoctions, like ephedrine, pseudoephedrine, norpseudoephedrine, licorice saponine H2, licorice saponine G2 and amygdalin. PMID:23572319

Ma, Chunhua; Qian, Yefei; Fan, Xinsheng; Shang, Erxin; Yao, Xin; Ma, Shiping

2013-04-01

179

The mass of the black hole in Centaurus A from SINFONI AO-assisted integral-field observations of stellar kinematics  

NASA Astrophysics Data System (ADS)

We present a determination of the mass of the supermassive black hole (BH) and the nuclear stellar orbital distribution of the elliptical galaxy Centaurus A (Cen A) (NGC 5128) using high-resolution integral-field observations of the stellar kinematics. The observations were obtained with SINFONI (Spectrograph for INtegral Field Observations in the Near Infrared) at the European Southern Observatory Very Large Telescope in the near-infrared (IR) (K band), using adaptive optics (AO) to correct for the blurring effect of the Earth's atmosphere. The data have a spatial resolution of 0.17 arcsec full width at half-maximum and high signal-to-noise ratios (S/N) >~ 80 per spectral pixel so that the shape of the stellar line-of-sight velocity distribution can be reliably extracted. We detect clear low-level stellar rotation, which is counter-rotating with respect to the gas. We fit axisymmetric three-integral dynamical models to the data to determine the best-fitting values for the BH mass MBH = (5.5 +/- 3.0) × 107Msolar (3? errors) and (M/L)K = (0.65 +/- 0.15) in solar units. These values are in excellent agreement with previous determinations from the gas kinematics, and in particular with our own published value, extracted from the same data. This provides one of the cleanest gas versus stars comparisons of MBH determination, due to the use of integral-field data for both dynamical tracers and due to a very well-resolved BH sphere of influence RBH ~ 0.70 arcsec. We derive an accurate profile of the orbital anisotropy, and carefully test its reliability using spherical Jeans models with radially varying anisotropy. We find an increase in the tangential anisotropy close to the BH, but the spatial extent of this effect seems restricted to the size of RBH instead of that of Rb ~ 3.9 arcsec of the core in the surface brightness profile, contrary to detailed predictions of current simulations of the binary BH scouring mechanism. More realistic simulations would be required to draw conclusions from this observation.

Cappellari, Michele; Neumayer, N.; Reunanen, J.; van der Werf, P. P.; de Zeeuw, P. T.; Rix, H.-W.

2009-04-01

180

Cuidados paliativos aos pacientes terminais: percepção da equipe de enfermagem Palliative care to terminal patients: perception of the nursing team cuidado Paliativo a los pacientes terminales: opinión del equipo de enfermería  

Microsoft Academic Search

ReSUMO: Trata-se de um estudo de abordagem qualitativa exploratória,realizado em um hospital do interior de Minas Gerais, com o objetivo de compreender o significado atribuído pela equipe de enfermagem aos cuidados paliativos com pacientes terminais.A partir dos relatos feitos pela equipe de enfermagem, foram identificadas cinco categorias: Percebendo a necessidade de humanizar o cuidar dos pacientes terminais; Presença da família:

Júlio César; Batista Santana; Kênia Fraga de Paula; Ana Cristina; Viana Campos; Maria Alice Efigênia Rezende; Bruna Danielle; Guedes Barbosa; Bianca Santana Dutra; Carlos Eduardo; Freitas Baldessari

181

Wet deposition and related atmospheric chemistry in the S* ao Paulo metropolis,Brazil: Part 1. Major inorganic ions in rainwater as evaluated by capillary electrophoresis with contactless conductivity detection  

Microsoft Academic Search

The metropolitan region of S* ao Paulo (17.8 million inhabitants) presents serious air quality problems. An official network monitors key air pollutants,however,there is no regular program of evaluation of the wet deposition and data about rainwater composition is scarce. Opening a series of articles on this subject,capillary zone electrophoresis with contactless conductivity detection (CZE-CCD) is proposed and applied as a

R. Rocha; A. Fracassi da Silva; Claudimir L. Lago; Adalgiza Fornaro; Ivano G. R. Gutz

182

Sr2Mn3Sb2O2 type oxyselenides: structures, magnetism, and electronic properties of Sr2AO2M2Se2 (A=Co, Mn; M=Cu, Ag).  

PubMed

Four new oxyselenides with nominal formula Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag) have been synthesized. They all crystallize in an I4/mmm space group and consist of alternating perovskite-like (Sr(2)AO(2))(2+) blocks and antiflourie (M(2)Se(2))(2-) layers, which are relatively rare layered oxyselenides reported so far that are isostructural to Sr(2)Mn(3)Sb(2)O(2). From powder X-ray diffraction data, compounds Sr(2)CoO(2)Cu(2)Se(2) and Sr(2)CoO(2)Ag(2)Se(2) are found near stoichiometric, whereas Sr(2)MnO(2)Cu(2-?)Se(2) and Sr(2)MnO(2)Ag(2-?)Se(2) possess substantial copper or silver vacancies (??0.5), consistent with their oxysulfide analogues. X-ray photoelectron spectroscopy measurements indicate the readily oxidization of Mn(2+) ions should be responsible for the occurrence of Cu/Ag vacancies. The rigid (Sr(2)AO(2))(2+) blocks within these compounds constrain the basal lattice parameters in the ab plane and result in largely deformed tetrahedral sites for the large silver ions. Magnetic susceptibility measurements of Sr(2)CoO(2)M(2)Se(2) (M=Cu, Ag) show complex antiferromagnetic transitions, while Sr(2)MnO(2)M(2-?)Se(2) (M=Cu, Ag) show high-temperature Curie-Weiss behavior, followed by low-temperature antiferromagnetic transitions at 54 K and 67 K, respectively. Except for Sr(2)MnO(2)Ag(2-?)Se(2), the other three compounds exhibit p-type semiconducting transport properties, with the measured resistivities several orders lower than their oxysulfide analogues. Hall measurement reveals high mobilities of Sr(2)CoO(2)M(2)Se(2) (M=Cu, Ag) compounds at room temperature. The unusually small optical band gaps (~0.07 eV) of Sr(2)CoO(2)Cu(2)Se(2), Sr(2)CoO(2)Ag(2)Se(2), and Sr(2)MnO(2)Cu(2-?)Se(2) are also reported. PMID:22967274

Jin, Shifeng; Chen, Xiaolong; Guo, Jiangang; Lei, Ming; Lin, Jingjing; Xi, Jianguo; Wang, Wenjun; Wang, Wanyan

2012-09-11

183

Activation of the Jasmonic Acid Pathway by Depletion of the Hydroperoxide Lyase OsHPL3 Reveals Crosstalk between the HPL and AOS Branches of the Oxylipin Pathway in Rice  

PubMed Central

The allene oxide synthase (AOS) and hydroperoxide lyase (HPL) branches of the oxylipin pathway, which underlie the production of jasmonates and aldehydes, respectively, function in plant responses to a range of stresses. Regulatory crosstalk has been proposed to exist between these two signaling branches; however, there is no direct evidence of this. Here, we identified and characterized a jasmonic acid (JA) overproduction mutant, cea62, by screening a rice T-DNA insertion mutant library for lineages that constitutively express the AOS gene. Map-based cloning was used to identify the underlying gene as hydroperoxide lyase OsHPL3. HPL3 expression and the enzyme activity of its product, (E)-2-hexenal, were depleted in the cea62 mutant, which resulted in the dramatic overproduction of JA, the activation of JA signaling, and the emergence of the lesion mimic phenotype. A time-course analysis of lesion formation and of the induction of defense responsive genes in the cea62 mutant revealed that the activation of JA biosynthesis and signaling in cea62 was regulated in a developmental manner, as was OsHPL3 activity in the wild-type plant. Microarray analysis showed that the JA-governed defense response was greatly activated in cea62 and this plant exhibited enhanced resistance to the T1 strain of the bacterial blight pathogen Xanthomonasoryzaepvoryzae (Xoo). The wounding response was attenuated in cea62 plants during the early stages of development, but partially recovered when JA levels were elevated during the later stages. In contrast, the wounding response was not altered during the different developmental stages of wild-type plants. These findings suggest that these two branches of the oxylipin pathway exhibit crosstalk with regards to biosynthesis and signaling and cooperate with each other to function in diverse stress responses.

Tang, Jiuyou; Wang, Weihong; Zhang, Fengxia; Wang, Guodong; Chu, Jinfang; Yan, Cunyu; Wang, Taoqing; Chu, Chengcai; Li, Chuanyou

2012-01-01

184

Activation of the jasmonic acid pathway by depletion of the hydroperoxide lyase OsHPL3 reveals crosstalk between the HPL and AOS branches of the oxylipin pathway in rice.  

PubMed

The allene oxide synthase (AOS) and hydroperoxide lyase (HPL) branches of the oxylipin pathway, which underlie the production of jasmonates and aldehydes, respectively, function in plant responses to a range of stresses. Regulatory crosstalk has been proposed to exist between these two signaling branches; however, there is no direct evidence of this. Here, we identified and characterized a jasmonic acid (JA) overproduction mutant, cea62, by screening a rice T-DNA insertion mutant library for lineages that constitutively express the AOS gene. Map-based cloning was used to identify the underlying gene as hydroperoxide lyase OsHPL3. HPL3 expression and the enzyme activity of its product, (E)-2-hexenal, were depleted in the cea62 mutant, which resulted in the dramatic overproduction of JA, the activation of JA signaling, and the emergence of the lesion mimic phenotype. A time-course analysis of lesion formation and of the induction of defense responsive genes in the cea62 mutant revealed that the activation of JA biosynthesis and signaling in cea62 was regulated in a developmental manner, as was OsHPL3 activity in the wild-type plant. Microarray analysis showed that the JA-governed defense response was greatly activated in cea62 and this plant exhibited enhanced resistance to the T1 strain of the bacterial blight pathogen Xanthomonasoryzaepvoryzae (Xoo). The wounding response was attenuated in cea62 plants during the early stages of development, but partially recovered when JA levels were elevated during the later stages. In contrast, the wounding response was not altered during the different developmental stages of wild-type plants. These findings suggest that these two branches of the oxylipin pathway exhibit crosstalk with regards to biosynthesis and signaling and cooperate with each other to function in diverse stress responses. PMID:23209649

Liu, Xiaoqiang; Li, Feng; Tang, Jiuyou; Wang, Weihong; Zhang, Fengxia; Wang, Guodong; Chu, Jinfang; Yan, Cunyu; Wang, Taoqing; Chu, Chengcai; Li, Chuanyou

2012-11-29

185

Ensino de Sistemas de Informac ¸ ˜ ao para Cursos de Graduac ¸ ˜ ao em Computac ¸ ˜ ao: Uma Experiencia Integrada e Inovadora  

Microsoft Academic Search

Teaching Information Systems in Computer graduation course s uses techniques already being applyed in market for some years, b ut when the aim is to integrate new technologies to systems practice at real or ganization environ- ments, new integrated and inovative approaches need to be us ed. This article presents a teaching proposal for Information Systems based on an inovative

Ghedini Ralha; Jorge Henrique Cabral Fernandes

186

Demência reversível e quedas associadas ao biperideno  

Microsoft Academic Search

Anticholinergic drugs may cause adverse effects, more often in the aged patients. We describe a case of reversible dementia and falls, associated with the use of biperiden. The patient was an 82-year old woman, admitted in a geriatric home because of frequent falls at home, progressive cognitive defi cit and tremor of extremities with movement, in addition to remarkable loss

Julio César Rigo; Juliana Ferrari de Oliveira Rigo; Breno Cezar Faria; Vitorino Modesto dos Santos

2006-01-01

187

The UPR Observatory A.O. System  

NASA Astrophysics Data System (ADS)

The University of Puerto Rico (UPR) has three, 30" telescopes currently under construction, which will be located at Fenton Hill, in Los Alamos, New Mexico. The telescopes will be interferometrically linked and will be equipped with adaptive optics systems that are low-cost and commercially viable. Thus the adaptive optics system will function to correct for lower-order aberrations in real-time. This talk will discuss the design and results to date of the progressing adaptive optics system, including influence functions of the deformable mirror (DM) and general specifics of the system. The DM under test is an OKO Technologies, micro-machined deformable mirror (MDM) with 37 electrostatic actuators, and the wave front sensor for the system is a Shack-Hartmann consisting of a "Gen IV" image intensified Dalsa CCD camera. The UPR Observatory is funded by the Air Force Office of Scientific Research (AFOSR) and the University of Puerto Rico.

Halter, F. C.; Baker, J. T.; Chang, M. P. J. L.; Friedman, J. F.

2000-12-01

188

Estímulos ao Desenvolvimento Tecnológico: Influência do Mercado  

Microsoft Academic Search

Nowadays the importance of Research and Development to a Company survival and longevity is well known. Virtually every industry feels the impact of increased competition and the fast pace of technology change. However, resources are getting scarce, both for doing business and research as well, leaving managers with the tough job of selecting which project will get funding. Years ago,

A. Cid

2002-01-01

189

Genetic data on nine STRs (CSF1PO, TPOX, THO1, F13AO1, FESFPS, vWA, D16S539, D7S820 and D13S317) and two VNTRs (D1S80 and D17S5) in Rosario population, Santa Fe Argentine  

Microsoft Academic Search

Allele frequencies for nine short tandem repeats (STRs) loci (CSF1PO, TPOX, THO1, F13AO1, FES\\/FPS, vWA, D16S539, D7S820 and D13S317) and two variable number tandem repeats (VNTRs) were obtained from a sample of 270 unrelated individuals born in the Rosario city, Santa Fe province of Argentina.

Mariano Tenaglia; Adriana Scollo; Regina Tripaldi; Irene Grappiolo; Armando M Perichón

2004-01-01

190

Toward the overthrow of half of a major paradigm for interfacial structure deduction, with special attention to the massive transformation in Ti-46.5 A/O Al alloy  

SciTech Connect

In parallel with the successful development of the theory of dislocations within a given phase, the theory and also the experimental knowledge of interphase boundaries made partially coherent by the presence of misfit dislocations and/or other linear misfit compensating defects have greatly advanced. The central idea to be offered on the connections, or lack thereof, among orientation relationship (OR), habit plane and electron microscopically observed interphase boundary structure in this paper, though yet to be proved fully, suggest the unfolding of yet another level of complexity--and perhaps also of clarity--in evaluating the structure of interphase boundaries. The massive transformation is a special case in point. Studies of interphase boundary structure with TEM are notoriously difficult to perform on this reaction because its usually swift growth kinetics often transform largely or completely the matrix phase even during relatively rapid cooling. Even if a sufficient proportion of the matrix phase is not consumed by the massive transformation, a martensitic transformation taking place subsequently during quenching to room temperature will destroy all of the remaining matrix phase. These problems can either seriously inhibit or altogether prevent direct TEM study of the interphase boundary structure. The preliminary report on the structure of (hcp) {alpha}:(L1{sub 0}) {gamma}{sub m} interfaces formed during the {alpha} {yields} {gamma}{sub m} massive transformation in a Ti-46.5 A/O Al alloy included in this paper is thus only the second on massive:matrix interfacial structure based on TEM yet to appear in the literature.

Nie, J.F.; Muddle, B.C.; Aaronson, H.I. [Monash Univ., Clayton, Victoria (Australia). Dept. of Materials Engineering; Furuhara, T. [Kyoto Univ. (Japan). Dept. of Materials Science and Engineering

1998-08-04

191

A?ˆO AFIRMATIVA E O COMBATE AO RACISMO INSTITUCIONAL NO BRASIL  

Microsoft Academic Search

AFFIRMATIVE ACTION AND THE FIGHT AGAINST INSTITUTIONAL RACISM IN BRAZIL. This article analyzes the debate on affirmative action in Brazil in the light of the bibliography about racism and the legal basis for equal opportunities. From this perspective, it challenges the critical visions to the implementation of reparatory policies, gathering evidence on the stateís participation in the legitimation of racial

VALTER ROBERTO SILV

192

Spectral Domain Optical Coherence Tomography for Glaucoma (An AOS Thesis)  

PubMed Central

Purpose Optical coherence tomography (OCT) is a rapidly evolving, robust technology that has profoundly changed the practice of ophthalmology. Spectral domain OCT (SD-OCT) increases axial resolution 2- to 3-fold and scan speed 60- to 110-fold vs time domain OCT (TD-OCT). SD-OCT enables novel scanning, denser sampling, and 3-dimensional imaging. This thesis tests my hypothesis that SD-OCT improves reproducibility, sensitivity, and specificity for glaucoma detection. Methods OCT progress is reviewed from invention onward, and future development is discussed. To test the hypothesis, TD-OCT and SD-OCT reproducibility and glaucoma discrimination are evaluated. Forty-one eyes of 21 subjects (SD-OCT) and 21 eyes of 21 subjects (TD-OCT) are studied to test retinal nerve fiber layer (RNFL) thickness measurement reproducibility. Forty eyes of 20 subjects (SD-OCT) and 21 eyes of 21 subjects (TD-OCT) are investigated to test macular parameter reproducibility. For both TD-OCT and SD-OCT, 83 eyes of 83 subjects are assessed to evaluate RNFL thickness and 74 eyes of 74 subjects to evaluate macular glaucoma discrimination. Results Compared to conventional TD-OCT, SD-OCT had statistically significantly better reproducibility in most sectoral macular thickness and peripapillary RNFL sectoral measurements. There was no statistically significant difference in overall mean macular or RNFL reproducibility, or between TD-OCT and SD-OCT glaucoma discrimination. Surprisingly, TD-OCT macular RNFL thickness showed glaucoma discrimination superior to SD-OCT. Conclusions At its current development state, SD-OCT shows better reproducibility than TD-OCT, but glaucoma discrimination is similar for TD-OCT and SD-OCT. Technological improvements are likely to enhance SD-OCT reproducibility, sensitivity, specificity, and utility, but these will require additional development.

Schuman, Joel S.

2008-01-01

193

Natural guide star AO system for the William Herschel Telescope  

Microsoft Academic Search

The UK Adaptive Optics program is funded to provide common user adaptive optics facilities for UK telescopes. One phase of this program aims to provide an adaptive optical system for the 4.2 m William Herschel Telescope (WHT), sited on La Palma in the Canary Islands. The WHT natural guide star (NGS) adaptive optics system is specified to have optimum correction

A. Bruce Gentles; Martyn Wells; Andrew J. Longmore; Richard M. Myers; Ronald A. Humphreys

1995-01-01

194

ALTAIR\\/NIRI AO Imaging of Volcanic Eruptions on Io  

Microsoft Academic Search

We propose to observe Io at 1-5 micron on 8 nights in the 2010B semester (every 45 deg in ionian longitude). This will take 1 hr per night. The (narrowband) J, H, K, L observations will be with ALTAIR\\/NIRI, the M observations with NIRI alone. These data will form part of a database characterizing Io's volcanic activity, information that is

Imke de Pater; Chad Trujillo; Franck Marchis; Heidi Hammel; Ashley Davies; David Williams; Giovanni Leone; Mike Wong; Mate Adamkovics; Rosaly Lopes; Dennis Matson; John Spencer

2010-01-01

195

The Large Binocular Telescope's ARGOS ground-layer AO system  

NASA Astrophysics Data System (ADS)

ARGOS, the laser-guided adaptive optics system for the Large Binocular Telescope (LBT), is now under construction at the telescope. By correcting atmospheric turbulence close to the telescope, the system is designed to deliver high resolution near infrared images over a field of 4 arc minute diameter. ARGOS is motivated by a successful prototype multi-laser guide star system on the 6.5 m MMT telescope, results from which are presented in this paper. At the LBT, each side of the twin 8.4 m aperture is being equipped with three Rayleigh laser guide stars derived from six 18 W pulsed green lasers and projected into two triangular constellations matching the size of the corrected field. The returning light is to be detected by wavefront sensors that are range gated within the seeinglimited depth of focus of the telescope. Wavefront correction will be introduced by the telescope’s deformable secondary mirrors driven on the basis of the average wavefront errors computed from the respective guide star constellation. Measured atmospheric turbulence profiles from the site lead us to expect that by compensating the ground-layer turbulence, ARGOS will deliver median image quality of about 0.2 arc sec in the near infrared bands. This will be exploited by a pair of multi-object near-IR spectrographs, LUCI1 and LUCI2, each with 4 arc minute field already operating on the telescope. In future, ARGOS will also feed two interferometric imaging instruments, the LBT Interferometer operating in the thermal infrared, and LINC-NIRVANA, operating at visible and near infrared wavelengths. Together, these instruments will offer very broad spectral coverage at the diffraction limit of the LBT’s combined aperture, 23 m in size.

Hart, M.; Rabien, S.; Busoni, L.; Barl, L.; Bechmann, U.; Bonaglia, M.; Boose, Y.; Borelli, J.; Bluemchen, T.; Carbonaro, L.; Connot, C.; Deysenroth, M.; Davies, R.; Durney, O.; Elberich, M.; Ertl, T.; Esposito, S.; Gaessler, W.; Gasho, V.; Gemperlein, H.; Hubbard, P.; Kanneganti, S.; Kulas, M.; Newman, K.; Noenickx, J.; de Xivry, G.; Qirrenback, A.; Rademacher, M.; Schwab, C.; Storm, J.; Vaitheeswaran, V.; Weigelt, G.; Ziegleder, J.

2011-09-01

196

Empirical performance management research: observations from AOS and MAR  

Microsoft Academic Search

Purpose – This paper seeks to respond to Otley's calls for future research to take an integrated and longitudinal approach to examining the operation of performance management in real organizations. The paper reviews 120 field studies published in Accounting, Organizations and Society and Management Accounting Research over the past 15 years. Design\\/methodology\\/approach – The Otley's performance management framework is used

Carolyn Stringer

2007-01-01

197

Gene Transcription Profile of the Detached Retina (An AOS Thesis)  

PubMed Central

Purpose: Separation of the neurosensory retina from the retinal pigment epithelium (RPE) yields many morphologic and functional consequences, including death of the photoreceptor cells, Müller cell hypertrophy, and inner retinal rewiring. Many of these changes are due to the separation-induced activation of specific genes. In this work, we define the gene transcription profile within the retina as a function of time after detachment. We also define the early activation of kinases that might be responsible for the detachment-induced changes in gene transcription. Methods: Separation of the retina from the RPE was induced in Brown-Norway rats by the injection of 1% hyaluronic acid into the subretinal space. Retinas were harvested at 1, 7, and 28 days after separation. Gene transcription profiles for each time point were determined using the Affymetrix Rat 230A gene microarray chip. Transcription levels in detached retinas were compared to those of nondetached retinas with the BRB-ArrayTools Version 3.6.0 using a random variance analysis of variance (ANOVA) model. Confirmation of the significant transcriptional changes for a subset of the genes was performed using microfluidic quantitative real-time polymerase chain reaction (qRT-PCR) assays. Kinase activation was explored using Western blot analysis to look for early phosphorylation of any of the 3 main families of mitogen-activated protein kinases (MAPK): the p38 family, the Janus kinase family, and the p42/p44 family. Results: Retinas separated from the RPE showed extensive alterations in their gene transcription profile. Many of these changes were initiated as early as 1 day after separation, with significant increases by 7 days. ANOVA analysis defined 144 genes that had significantly altered transcription levels as a function of time after separation when setting a false discovery rate at ?0.1. Confirmatory RT-PCR was performed on 51 of these 144 genes. Differential transcription detected on the microarray chip was confirmed by qRT-PCR for all 51 genes. Western blot analysis showed that the p42/p44 family of MAPK was phosphorylated within 2 hours of retinal-RPE separation. This phosphorylation was detachment-induced and could be inhibited by specific inhibitors of MAPK phosphorylation. Conclusions: Separation of the retina from the RPE induces significant alteration in the gene transcription profile within the retina. These profiles are not static, but change as a function of time after detachment. These gene transcription changes are preceded by the activation of the p42/p44 family of MAPK. This altered transcription may serve as the basis for many of the morphologic, biochemical, and functional changes seen within the detached retina.

Zacks, David N.

2009-01-01

198

Análise custo\\/volume\\/lucro aplicada ao comércio de pescados  

Microsoft Academic Search

This article presents the application of the cost\\/volume\\/profit analysis in an organization which commercial- izes both ocean fishes and fishes cultivated in captivity. After a brief review of literature the case study is described. After listing the main characteristics of the organization under scrutiny, the steps of the work are described in detail, showing where the data were collected, the

Livia C. Moraes; Rodney Wernke

199

Contrast analysis and stability on the ExAO testbed  

NASA Astrophysics Data System (ADS)

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. The Laboratory for Adaptive Optics at UC Santa Cruz is investigating limits to high-contrast imaging in support of the Gemini Planet Imager. Previous contrast measurements were made with a simple single-opening prolate spheroid shaped pupil that produced a limited region of high-contrast, particularly when wavefront errors were corrected with the 1024-actuator Boston Micromachines MEMS deformable mirror currently in use on the testbed. A more sophisticated shaped pupil is now being used that has a much larger region of interest facilitating a better understanding of high-contrast measurements. In particular we examine the effect of heat sources in the testbed on PSF stability. We find that rms image motion scales as 0.02 ?/D per watt when the heat source is near the pupil plane. As a result heat sources of greater than 5 watts should be avoided near pupil planes for GPI. The safest place to introduce heat is near a focal plane. Heat also can effect the standard deviation of the high-contrast region but in the final instrument other sources of error should be more significant.

Evans, Julia W.; Thomas, Sandrine; Gavel, Donald; Dillon, Daren; Macintosh, Bruce

2008-07-01

200

Liquid Nitrogen Cryotherapy for Surface Eye Disease (An AOS Thesis)  

PubMed Central

Purpose To evaluate the effects of new treatments with liquid nitrogen cryotherapy on some external eye conditions. Methods In this retrospective case study, 6 separate series from a single tertiary care referral center practice are described. Liquid nitrogen cryotherapy was used to treat conjunctival amyloidosis, primary pterygia, recurrent pterygia, advancing wavelike epitheliopathy (AWLE), superior limbic keratoconjunctivitis (SLK), and palpebral vernal keratoconjunctivitis (VKC). The main outcome measure was the resolution of the disease process after treatment. Results Four patients with primary localized conjunctival amyloidosis were treated with liquid nitrogen cryotherapy. Two of them had recurrence of the amyloidosis, which cleared with subsequent treatment. Eighteen patients with primary pterygia had excision and cryotherapy with 1 recurrence. Of 6 subjects who presented with recurrent pterygia, 4 had a second recurrence after excision and cryotherapy. In 5 patients with AWLE, the condition resolved within 2 weeks without recurrence or the need for subsequent cryotherapy. Four patients with SLK were treated with liquid nitrogen cryotherapy. Disease recurred in 2 patients and 3 of 7 eyes, although subsequent cryotherapy eradicated SLK in all cases. Two patients and 3 eyelids with palpebral VKC were treated with liquid nitrogen cryotherapy. VKC recurred in all cases. Conclusions Liquid nitrogen cryotherapy to the surface of the eye is effective in treating AWLE, and SLK. Excision followed by cryotherapy is successful in treating conjunctival amyloidosis and primary pterygia Liquid nitrogen cryotherapy is unsuccessful in the treatment of recurrent pterygia and VKC.

Fraunfelder, Frederick Web

2008-01-01

201

The Large Binocular Telescope's ARGOS ground-layer AO system  

Microsoft Academic Search

ARGOS, the laser-guided adaptive optics system for the Large Binocular Telescope (LBT), is now under construction at the telescope. By correcting atmospheric turbulence close to the telescope, the system is designed to deliver high resolution near infrared images over a field of 4 arc minute diameter. ARGOS is motivated by a successful prototype multi-laser guide star system on the 6.5

M. Hart; S. Rabien; L. Busoni; L. Barl; U. Bechmann; M. Bonaglia; Y. Boose; J. Borelli; T. Bluemchen; L. Carbonaro; C. Connot; M. Deysenroth; R. Davies; O. Durney; M. Elberich; T. Ertl; S. Esposito; W. Gaessler; V. Gasho; H. Gemperlein; P. Hubbard; S. Kanneganti; M. Kulas; K. Newman; J. Noenickx; G. de Xivry; A. Qirrenback; M. Rademacher; C. Schwab; J. Storm; V. Vaitheeswaran; G. Weigelt; J. Ziegleder

2011-01-01

202

DOENÇAS DE PARKINSON E ALZHEIMER ASSOCIADAS AO ENVELHECIMENTO  

Microsoft Academic Search

Aging is a natural process that leads to morphologic and physiologic alterations that may, in turn, lead to diseases, and the consequences of the neural system aging present clear relationship with the dementia etiology. The appearing of Alzheimer's disease (AD) is associated to genetic and aging factors, with inefficient treatments and neuropathology only detected after death. The Parkinsonism is also

Alessandro Camilo NERES; Humberto Gabriel RODRIGUES; Tales Alexandre AVERSI-FERREIRA

203

Laboratório Remoto aplicado ao Ensino de Engenharia Eletrônica  

Microsoft Academic Search

This work presents an interactive remote laboratory on-line for educational applications in the area of electronic engineering. The laboratory uses service WEB of the Internet as communication infrastructure, applicatory for instrumentation based on computer and an dedicated hardware for control of real experiments. In this way any computer with connection the Internet will be able to act in an experiment

André Ricardo Marchezan; Marco Tulio Chell; Elnatan Chagas Ferreira

204

Poliuretana derivada de óleos vegetais exposta ao intemperismo artificial  

Microsoft Academic Search

The mechanical and viscoelastic properties of polyurethane derived from castor oil were obtained after being exposed to artificial weathering with the purpose of evaluating their applicability as polymeric coatings on concrete substrate for Civil Construction. The procedures followed the ASTM G53 for \\

Alessandra E. F. S. Almeida; Osny P. Ferreira

2006-01-01

205

Estudo fenotípico e genotípico da resistência aos macrolídeos de \\  

Microsoft Academic Search

Objective: The aim of this study was to determine the prevalence of macrolide-resistant S. pneumoniae and to identify its phenotypic and genotypic characteristics. Methods: Strains of S. pneumoniae isolated in the city of Porto Alegre between May 2002 and August 2004 from samples collected from different anatomical sites were analyzed. For the agar diffusion test, disks of erythromycin, clarithromycin, azithromycin

Zettler FR; Zettler EW; Schmitt VM; Jahns MT; Dias CAG; Fritscher CC; FABIANA ROWE ZETTLER; EDUARDO WALKER ZETTLER; VIRGINIA MINGHELLI SCHMITT; MARINA TAGLIARO JAHNS; GOMES DIAS; CARLOS CEZAR FRITSCHER

2005-01-01

206

Contrast analysis and stability on the ExAO testbed  

SciTech Connect

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. The Laboratory for Adaptive Optics at UC Santa Cruz is investigating limits to high-contrast imaging in support of the Gemini Planet Imager. Previous contrast measurements were made with a simple single-opening prolate spheroid shaped pupil that produced a limited region of high-contrast, particularly when wavefront errors were corrected with the 1024-actuator Boston Micromachines MEMS deformable mirror currently in use on the testbed. A more sophisticated shaped pupil is now being used that has a much larger region of interest facilitating a better understanding of high-contrast measurements. In particular we examine the effect of heat sources in the testbed on PSF stability. We find that rms image motion scales as 0.02 {lambda}/D per watt when the heat source is near the pupil plane. As a result heat sources of greater than 5 watts should be avoided near pupil planes for GPI. The safest place to introduce heat is near a focal plane. Heat also can effect the standard deviation of the high-contrast region but in the final instrument other sources of error should be more significant.

Evans, J; Thomas, S; Gavel, D; Dillon, D; Macintosh, B

2008-06-10

207

The Ahmed Glaucoma Valve in Neovascular Glaucoma (An AOS Thesis)  

PubMed Central

Purpose: To evaluate the results of Ahmed glaucoma valve surgery in neovascular glaucoma and control patients. Methods: In this retrospective comparative study, we reviewed 76 eyes of 76 patients, comparing the surgical outcomes in control patients (N=38) to matched neovascular glaucoma patients (N=38). Success was defined as intraocular pressure (IOP) ?6 mm Hg and ?21 mm Hg, without further glaucoma surgery, and without loss of light perception. Results: Average follow-up for control and neovascular glaucoma patients was 18.4 and 17.4 months, respectively (P = .550). At last follow-up, mean IOP was 16.2 ± 5.2 mm Hg and 15.5 ± 12.5 mm Hg (P = .115) in control and neovascular glaucoma patients, respectively. Life-table analysis showed a significantly lower success for neovascular glaucoma patients compared with controls (P = .0096), with success at 1 year of 89.2% and 73.1%, at 2 years of 81.8% and 61.9%, and at 5 years of 81.8% and 20.6% for control and neovascular glaucoma eyes, respectively. Cox proportional hazards regression analysis showed neovascular glaucoma as a risk factor for surgical failure (odds ratio, 5.384, 95% CI, 1.22–23.84, P = .027). Although IOP control and complications were comparable between the two groups, visual outcomes were worse in neovascular glaucoma patients, with 9 eyes (23.7%) with neovascular glaucoma compared with no controls losing light perception vision (P = .002). The majority with loss of vision (5 of 9) had successful control of IOP during the postoperative period. Conclusion: Neovascular glaucoma patients have greater risk of surgical failure after Ahmed glaucoma valve surgery compared with controls. Despite improved mean IOP with drainage implants, visual outcomes may be poor, possibly due to progression of underlying disease.

Netland, Peter A.

2009-01-01

208

Regional cooperation in RWM in the AO countries.  

PubMed

Regional cooperation in radioactive waste management (RWM) in the Asian and Oceanic countries has been successfully developing for more than 20 y. At present, the Asian and Oceanic countries recognise that there are several projects under the regional cooperation, such as the Forum for Nuclear Cooperation in Asia (FNCA), the Asian Nuclear Safety Network (ANSN) and the International Atomic Energy Agency (IAEA) regional projects. The FNCA on Radiation Safety and RWM is an effective mechanism for enhancing socio-economic development through active regional partnership in the peaceful and safe utilisation of nuclear technology. The ANSN Topical Group on RWM is established for exchanging, pooling, and sharing knowledge in the field of nuclear safety. For IAEA regional cooperation on RWM, such as IAEA-regional project RAS/3/009 Strengthening Infrastructure of RWM can provide and support Asian and Oceanic countries for national work plan, fellowships and scientific visits as well as expert services. PMID:21561940

Ya-anant, Nanthavan; Thiangtrongjit, Sutat

2011-05-10

209

LIMITES AO EXERCÍCIO DA POLÍTICA SOCIAL DE SEGURANÇA ALIMENTAR  

Microsoft Academic Search

This paper discuss the nature of the limits and the hierarchy of the public politics, showing the structural reasons that can explain the priority of some functions of the State. The intention is to give the basis to a theoretical support for a critical empirical analysis of the evolution of programs of alimentary security. In the first section we synthesize

Ebenézer Pereira Couto; Niemeyer Almeida Filho

210

Teorias biológicas do envelhecimento: do genético ao estocástico  

Microsoft Academic Search

Biological theories of aging: genetic and stochastic ap- proaches The biological theories of aging analyze the degenera- tion process of the structure and function of cells and or- ganic systems. They can be generally classified into two categories: genetic-developmental and stochastic theories. The first group understands the aging process as a genetic determined continuum, while the latter focuses the effects

Paulo de Tarso; Veras Farinatti

2002-01-01

211

DOS GENES AOS MEMES: A EMERGÊNCIA DO REPLICADOR CULTURAL  

Microsoft Academic Search

O objetivo desse trabalho é introduzir a memética, as investigações sobre os memes, unidades culturais de imitação que pretensamente são os átomos da cultura e da história. Partindo de uma analogia com a teoria do gene como nível fundamental de seleção, popularizada como a teoria do gene egoísta, a memética pretende propor modelos explicativos que podem ser úteis para compreender

Ricardo Waizbort

212

SELETIVIDADE DE CARFENTRAZONE-ETHYL AOS MILHOS DOCE E NORMAL  

Microsoft Academic Search

RESUMO - Com o objetivo de avaliar a seletividade de carfentrazone-ethyl, herbicida pós- emergente com ação de inibição da enzima protoporfirinogeneo oxidase (PROTOX), sobre cultivares de milho normal e doce, foram instalados experimentos sob condições de casa de vegetação, na Embrapa Milho e Sorgo, em Sete Lagoas, MG. Os experimentos foram dis- postos em blocos casualizados, com quatro repetições. Foram

DÉCIO KARAM; JOSÉ FRANCISCO R. LARA; PAULO CÉSAR MAGALHÃES; ISRAEL ALEXANDRE; PEREIRA FILHO; MICHELLE B. CRUZ

213

Aspect-Oriented Web Service Composition with AO4BPEL  

Microsoft Academic Search

Web services have become a universal technology for integration of distributed and heterogeneous applications over the Internet. Many recent proposals such as the Business Process Modeling Language (BPML) and the Business Process Execution Language for Web Services (BPEL4WS) focus on combining existing web services into more sophisticated web services. However, these standards exhibit some limitations regarding modularity and flexibility. In

Anis Charfi; Mira Mezini

2004-01-01

214

AO4BPEL: An Aspect-oriented Extension to BPEL  

Microsoft Academic Search

Process-oriented composition languages such as BPEL allow Web Services to be composed into more sophisticated services using\\u000a a workflow process. However, such languages exhibit some limitations with respect to modularity and flexibility. They do not\\u000a provide means for a well-modularized specification of crosscutting concerns such as logging, persistence, auditing, and security.\\u000a They also do not support the dynamic adaptation of

Anis Charfi; Mira Mezini

2007-01-01

215

Global Warming Patterns over the North Pacific: ENSO versus AO  

Microsoft Academic Search

The relationships between the natural variability and CO2-induced response over the Pacific region are investigated in terms of the spatial anomaly pattern of SST, sea level pressure and precipitation by a multi-model intercomparison analysis, based on the 18-model results contributing to the IPCC Fourth Assessment Report. The analysis indicates that the CO2-induced response pattern is related with the model natural

Kazuki YAMAGUCHI; Akira NODA

2006-01-01

216

High-speed photometry of faint cataclysmic variables - IV. V356 Aql, Aqr1, FIRST J1023+0038, H? 0242-2802, GI Mon, AO Oct, V972 Oph, SDSS 0155+00, SDSS 0233+00, SDSS 1240-01, SDSS 1556-00, SDSS 2050-05, FH Ser  

NASA Astrophysics Data System (ADS)

We present results from high-speed photometry of a further 13 faint cataclysmic variables. V356 Aql (Nova Aql 1936) shows flare-like outbursts with recurrence time-scales ~3000 s, but no coherent periodicities. Aqr1 is an intermediate polar with a spin period of 6.7284 min and a probable orbital period Porb = 3.226 h derived from orbital sidebands. Its orbital sideband frequencies show very variable amplitudes. The published spectroscopic period of 2.0 h suggests that Aqr1 is similar to GW Lib and FS Aur in having an additional periodicity of unknown origin. FIRST J1023+0038 has Porb = 4.7548 h with an orbital modulation of range 0.45 mag, probably caused by reflection effect from a hot white dwarf primary; as such it may have been a nova sometime in the past few decades. H? 0242 is a deeply eclipsing very low mass-transfer rate system, probably a dwarf nova of very long outburst interval, with Porb = 1.792 h. GI Mon, an old nova, has optical modulations at 4.325 h and possibly also at 48.6 min and is thus a candidate intermediate polar. AO Oct, an SU UMa type dwarf nova, shows orbital modulation at quiescence with Porb = 94.097 min. V972 Oph (Nova Ophiuchi 1957) showed no flickering activity during one set of observations, but did so at a later time, confirming the correctness of the identification of this object, but it shows no orbital modulation. SDSS 0155 is a deeply eclipsing polar with an orbital period of 87.13 min. SDSS 0233 shows flaring activity but no discernible periodicity. No periodicity was found in the new AM CVn candidate SDSS 1240. SDSS 1556 shows a periodic modulation at 1.778 h, which is possibly due to orbital motion. SDSS 2050 is an eclipsing polar with Porb = 1.5702 h. FH Ser (Nova Serpentis 1970) has strong flickering activity but no detectable orbital modulation.

Woudt, Patrick A.; Warner, Brian; Pretorius, Magaretha L.

2004-07-01

217

Chemical composition of ? Scuti stars: 1. AO CVn, CP Boo, KW Aur  

NASA Astrophysics Data System (ADS)

We used high-resolution echelle spectra acquired with the 1.5-m Russian-Turkish Telescope to determine the fundamental atmospheric parameters and abundances of 30 chemical elements for three ? Scuti stars: AOCVn, CP Boo, and KWAur. The chemical compositions we find for these stars are similar to those for Am-star atmospheres, though some anomalies of up to 0.6-0.7 dex are observed for light and heavy elements. We consider the effect of the adopted stellar parameters (effective temperature, log g, microturbulent velocity) and the amplitude of pulsational variations on the derived elemental abundances.

Galeev, A. I.; Ivanova, D. V.; Shimansky, V. V.; Bikmaev, I. F.

2012-11-01

218

Facility class Rayleigh beacon AO system for the 4.2m William Herschel telescope  

Microsoft Academic Search

A rationale is presented for the use of a relatively low-altitude (15km) Rayleigh Laser Guide Star to provide partial adaptive optics correction across a large fraction of the sky on the 4.2m William Herschel Telescope. The scientific motivation in relation to the available instrumentation suite is discussed and supported by model performance calculations, based on observed atmospheric turbulence distributions at

René G. Rutten; Paul Clark; Richard M. Myers; Richard W. Wilson; Richard G. Bingham; Eric Emsellem; Thomas Gregory; Ronald A. Humphreys; Johan Knapen; Gilberto Moretto; Simon L. Morris; Gordon Talbot

2003-01-01

219

A ground-layer AO system demonstrator for the William Herschel Telescope  

Microsoft Academic Search

An experimental Ground Layer Adaptive Optics system utilizing a low-altitude Rayleigh Laser Guide Star is presented. This demonstrator is designed for the GHRIL Nasmyth platform of the 4.2m William Herschel Telescope, where it uses a low-altitude (~4km) focused-spot 523nm Rayleigh-scatter beacon, launched from behind the secondary mirror using an independent beam launch telescope. A novel range-gate is used to select

Timothy J. Morris; Paul Berry; Timothy Butterley; Paul Clark; Colin N. Dunlop; Richard M. Myers; Christopher D. Saunter; Richard W. Wilson

2004-01-01

220

Lesão medular associada ao manejo incorreto de caprino Medular lesion associated to caprine management  

Microsoft Academic Search

Práticas inadequadas de manejo atuam como fatores predisponentes a quadros clínico-patológicos em caprinos, destacando-se as falhas nutricionais e erros de amochamento e casqueamento. No presente relato, apresenta-se um caso de traumatismo medular na região cervical em caprino Saanen de quatro anos de idade, mantido em regime de confinamento. Segundo história clínica obtida com o tratador, o caprino se apresentou disposto

Fernanda Moraes Cardoso; Pedro Miguel Ocampos Pedroso; Adriana da Silva Santos; Marcele Sousa Vilanova; David Driemeier; Verônica Schmidt

2009-01-01

221

PCR: a PC-based wave front reconstructor for MMT-AO  

NASA Astrophysics Data System (ADS)

PC Reconstructor (PCR) is the control software for the natural guide star and the laser guide star systems at the 6.5m Multiple Mirror Telescope (MMT) operating with the adaptive secondary mirror on Mt. Hopkins south of Tucson, AZ. The PCR computes and corrects atmospheric turbulence featuring a common interface between the wave front sensor camera control link and the deformable mirror, diagnostic data management, vibration control, closed-loop data distribution and saving routines, and housekeeping modules. We report here on the development, use and the on-sky performance of the PCR.

Vaitheeswaran, Vidhya; Hinz, Phil; Brusa, Guido; Miller, Doug; Stalcup, Thomas

2008-08-01

222

Status report on the Large Binocular Telescope's ARGOS ground-layer AO system  

NASA Astrophysics Data System (ADS)

ARGOS, the laser-guided adaptive optics system for the Large Binocular Telescope (LBT), is now under construction at the telescope. By correcting atmospheric turbulence close to the telescope, the system is designed to deliver high resolution near infrared images over a field of 4 arc minute diameter. Each side of the LBT is being equipped with three Rayleigh laser guide stars derived from six 18 W pulsed green lasers and projected into two triangular constellations matching the size of the corrected field. The returning light is to be detected by wavefront sensors that are range gated within the seeing-limited depth of focus of the telescope. Wavefront correction will be introduced by the telescope's deformable secondary mirrors driven on the basis of the average wavefront errors computed from the respective guide star constellation. Measured atmospheric turbulence profiles from the site lead us to expect that by compensating the ground-layer turbulence, ARGOS will deliver median image quality of about 0.2 arc sec across the JHK bands. This will be exploited by a pair of multi-object near-IR spectrographs, LUCIFER1 and LUCIFER2, with 4 arc minute field already operating on the telescope. In future, ARGOS will also feed two interferometric imaging instruments, the LBT Interferometer operating in the thermal infrared, and LINC-NIRVANA, operating at visible and near infrared wavelengths. Together, these instruments will offer very broad spectral coverage at the diffraction limit of the LBT's combined aperture, 23 m in size.

Hart, M.; Rabien, S.; Busoni, L.; Barl, L.; Beckmann, U.; Bonaglia, M.; Boose, Y.; Borelli, J. L.; Bluemchen, T.; Carbonaro, L.; Connot, C.; Deysenroth, M.; Davies, R.; Durney, O.; Elberich, M.; Ertl, T.; Esposito, S.; Gaessler, W.; Gasho, V.; Gemperlein, H.; Hubbard, P.; Kanneganti, S.; Kulas, M.; Newman, K.; Noenickx, J.; Orban de Xivry, G.; Peter, D.; Quirrenbach, A.; Rademacher, M.; Schwab, C.; Storm, J.; Vaitheeswaran, V.; Weigelt, G.; Ziegleder, J.

2011-09-01

223

Tempo e Universidade: A Evolução da Perspectiva Temporal ao Longo do Percurso Universitário  

Microsoft Academic Search

The Time Perspective – TP has deep implications in several motivational processes (Zimbardo & Boyd, 1999), specifically his Future dimension shows a determinant influence in various issues like vocational development of individuals (Paixão, 2004), academic achievement (Lens & Tsuzuki, 2005) and entrepreneurs attitudes and behaviors (Przepiórka, 2010). However, TP is normally affected by cultural, educational, religious and sociopolitics factors; reason

Victor E. C. Ortuño; Maria Paula Paixão; Isabel Janeiro

2011-01-01

224

Autoria de Diretrizes Pedagógicas Destinadas ao Treinamento das Múltiplas Capacidades da Perícia em Conceitos Visuais Complexos  

Microsoft Academic Search

In the world of Authoring Systems research, the connection between pedagogic models and learner models has been largely ignored. Similarly, previous work has not accounted for visual concept tutoring based on the underlying pedagogic directives. This paper describes how cognitive and computational concepts can be applied to build pedagogic models for long-term tutorial interactions. An approach to the design of

Ligia Flávia; Antunes Batista; Alexandre Ibrahim Direne; Itana Maria de Souza; Omar Gemha Taha; Ultramed Londrina

2003-01-01

225

Study of Solubilizing Capacity of Anionic Surfactants (AOS and SLS) in Spray-Dried Pesticide Formulation  

Microsoft Academic Search

The slow dissolution rate exhibited by sparingly water?soluble pesticide is a major challenge in the pesticide development process. The aim of this study was to improve the dissolution rate of a sparingly water soluble model pesticide, Atrazine. Microparticles containing the model pesticide (atrazine) were produced by spray?drying technique in the absence and presence of an anionic surfactant. Alpha olefin sulfonate

Srikanth S. Kamath; Manohar R. Sawant

2008-01-01

226

Experimental study of AO and T1 modes of the concert harp.  

PubMed

String instruments are usually composed of a set of strings, a soundboard, and a soundbox with sound holes, which is generally designed to increase the sound level by using the acoustic resonances of the cavity. In the case of the harp, the soundbox and especially the sound holes are primarily designed to allow access to the strings for their mounting. An experimental modal analysis, associated to measurements of the acoustic velocity in the holes, shows the importance of two particular modes labeled A0 and T1 as it was done for the guitar and the violin. Their mode shapes involve coupled motions of the soundboard's bending and of the oscillations of the air pistons located in the sound holes. The A0 mode is found above the frequency of the lowest acoustically significant structural mode T1. Thus, the instrument does not really take advantage of the soundbox resonance to increase its radiated sound in low frequencies. However, contribution of mode A0 is clearly visible in the response of the instrument, confirming the importance of the coupling between the soundboard and the cavity. PMID:17297809

Le Carrou, J L; Gautier, F; Foltête, E

2007-01-01

227

Técnicas e práticas para dar respostas localmente apropriadas ao HIV\\/AIDS : parte 1: Técnicas  

Microsoft Academic Search

In 2001 UNAIDS initiated the development of a toolkit with techniques and practices for AIDS competence in consultation with the UNAIDS Secretariat, with the UN Theme Groups in different countries and members of the UNAIDS Technical Network on Local Responses to HIV\\/AIDS. The toolkit aims to further strengthen the capacity and competence of different actors to address HIV\\/AIDS at local

M. Wegelin-Schuringa; G. Tiendrebéogo

2004-01-01

228

Analisador Sintático - Uma Ferramenta Didática para Auxílio ao Ensino-Aprendizagem de Algoritimos  

Microsoft Academic Search

This work is the result of the studying about the use of didactics softwares in the teaching-learning process, which presents a software to help the students in the algorithmic construction task, where the student write the algorithmic using a current language and the software analyze the structure through its own syntax. Keywords - teaching-learning process, programming logic, algorithmic learning, didactics

Andrezza R. Filizzola da Silva; Jacqueline S. Moura; Thiago Bezerra Lima

229

Key Learning Competencies across Place and Time: Kimihia Te Ara Totika, Hei Oranga Mo To Ao  

ERIC Educational Resources Information Center

The overarching aim of this research in the proposal was the following: In a number of early childhood centres and early years school classrooms that have already begun to explore in this area, to investigate effective pedagogy designed to develop five learning competencies over time. This project was developed in response to curriculum reform in…

Carr, Margaret; Peters, Sally; Davis, Keryn; Bartlett, Claire; Bashford, Nadine; Berry, Paula; Greenslade, Susie; Molloy, Sue; O'Connor, Nikki; Simpson, Mere; Smith, Yvonne; Williams, Tina; Wilson-Tukaki, Andrea

2008-01-01

230

Rabdomiólise devido ao uso de estatina em altas doses: relato de caso  

Microsoft Academic Search

High Doses Statins Administration Causing Rhabdomyolysis: Case Report. Rhabdomyolysis has been the theme in medical literature for the last fifty years. In these last decades, with statins being used in primary and sec- ondary cardiovascular prevention events, this theme returns and statins are now pointed as the trigger to this almost always fatal complication. Rhabdomyolysis due to statins administration occurs

Mirnaluci P. Ribeiro Gama; Silviane Pellegrinello; Sheyla Santos Quelle Alonso; Juliana Filus Coelho; Caroline F. Luz Martins; Gleyne Lopes Kujew Biagini

2005-01-01

231

Status report on the Large Binocular Telescope's ARGOS ground-layer AO system  

Microsoft Academic Search

ARGOS, the laser-guided adaptive optics system for the Large Binocular Telescope (LBT), is now under construction at the telescope. By correcting atmospheric turbulence close to the telescope, the system is designed to deliver high resolution near infrared images over a field of 4 arc minute diameter. Each side of the LBT is being equipped with three Rayleigh laser guide stars

M. Hart; S. Rabien; L. Busoni; L. Barl; U. Beckmann; M. Bonaglia; Y. Boose; J. L. Borelli; T. Bluemchen; L. Carbonaro; C. Connot; M. Deysenroth; R. Davies; O. Durney; M. Elberich; T. Ertl; S. Esposito; W. Gaessler; V. Gasho; H. Gemperlein; P. Hubbard; S. Kanneganti; M. Kulas; K. Newman; J. Noenickx; G. Orban de Xivry; D. Peter; A. Quirrenbach; M. Rademacher; C. Schwab; J. Storm; V. Vaitheeswaran; G. Weigelt; J. Ziegleder

2011-01-01

232

Ka hua o'o ka pu'ao (the fruit of the womb). Presidential address.  

PubMed

Attention is directed to the obstetric customs of the Hawaiians in the pre-Captain Cook era, i.e., from the arrival of the Hawaiians in Hawaii until 1778, when Captain Cook first arrived at Waimea, Kauai. Radiocarbon assays of charcoal set the date of arrival of Polynesians in Hawaii as early as 1004 AD, in the range of 180 years earlier or later, but it has been deduced that people may have been living in this area for several hundred years prior to that date. Cook arrived during the era of the American Revolutionary War. The Hawaiians had a highly organized society with definite temporal and religious rules. In the field of medicine, the "kanuna ohihana lapa'au" was the most well known and best educated. Families were large, and there were often 10-12 children. Various herbal medications were used to promote fertility, and the belief is that they may have been of considerable help. The custom of adoption often solved the problem of infertility. According to this custom, a child from a fertile woman would be given to 1 of her close relatives who was not able to become pregnant. Generally, no effort was made to avoid conception. Pregnancy for the common woman was not a restrictive situation. Mates were not separated, and intercourse occurred until about the 7th month. In old Hawaii, the mother's diet during pregnancy was strictly regulated from the 4th month to delivery. Much emotional support was given to the mother throughout pregnancy by her family. Labor was a family affair with relatives and close friends attending. Birthing was usually accomplished in a building especially designed for that purpose. There is no record of postpartum depression. Intercourse was not allowed after delivery, as a matter of religious and medical sense, until the lochia was no longer red. Although Hawaiians had large families, there was social pressure against having an excessive number of children. Usually children were breastfed to the 2nd year. Infanticide, practiced quite commonly in some Polynesian communities, was not common in Hawaii. In the area of obstetrics, careful thought, education, and specialization in the field were practiced. The psychological support of the patient far exceeded the family and community support provided by today's society. PMID:7081303

McCorriston, C C

1982-05-01

233

DISCOVERY OF A FAINT COMPANION TO ALCOR USING MMT/AO 5 {mu}m IMAGING  

SciTech Connect

We report the detection of a faint stellar companion to the famous nearby A5V star Alcor (80 UMa). The companion has M-band ({lambda} = 4.8 {mu}m) magnitude 8.8 and projected separation 1.''11 (28 AU) from Alcor. The companion is most likely a low-mass ({approx}0.3 M {sub sun}) active star which is responsible for Alcor's X-ray emission detected by ROSAT (L {sub X} {approx_equal} 10{sup 28.3} erg s{sup -1}). Alcor is a nuclear member of the Ursa Major star cluster (UMa; d {approx_equal} 25 pc, age {approx_equal} 0.5 Gyr), and has been occasionally mentioned as a possible distant (709'') companion of the stellar quadruple Mizar ({zeta} UMa). Comparing the revised Hipparcos proper motion for Alcor with the mean motion for other UMa nuclear members shows that Alcor has a peculiar velocity of 1.1 km s{sup -1}, which is comparable to the predicted velocity amplitude induced by the newly discovered companion ({approx}1 km s{sup -1}). Using a precise dynamical parallax for Mizar and the revised Hipparcos parallax for Alcor, we find that Mizar and Alcor are physically separated by 0.36 {+-} 0.19 pc (74 {+-} 39 kAU; minimum 18 kAU), and their velocity vectors are marginally consistent ({chi}{sup 2} probability 6%). Given their close proximity and concordant motions we suggest that the Mizar quadruple and the Alcor binary be together considered the second closest stellar sextuplet. The addition of Mizar-Alcor to the census of stellar multiples with six or more components effectively doubles the local density of such systems within the local volume (d < 40 pc)

Mamajek, Eric E. [University of Rochester, Department of Physics and Astronomy, Rochester, NY 14627-0171 (United States); Kenworthy, Matthew A.; Hinz, Philip M.; Meyer, Michael R. [Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)

2010-03-15

234

O IMPACTO DAS PROMOÇÕES DE VENDAS NA ESCOLHA DAS CRIANÇAS: ESTUDO APLICADO AOS CEREAIS  

Microsoft Academic Search

This study was carried out in three schools and two activities centres in the north of Portugal (children's between the ages of 8 and 12 years old). The aim of this study is about children's market and their relationship with the different kinds of promotions in cereals boxes, for that, there were applied 103 questionnaires, 58 girls and 45 boys.

Laura Isabel; Tavares de Almeida; Pinto Nogueira; Pessoa António; Joaquim Magalhães Cardoso

235

Teoria das Ondas de Elliott- Uma aplicação ao mercado de ações aa Bm&Fbovespa  

Microsoft Academic Search

Os preços dos ativos negociados em bolsas de valores, assim como qualquer outro tipo de commodity do mercado financeiro, oscilam naturalmente com a procura por esses produtos. Essas oscilações, juntamente com a assimetria das informações acerca dos preços desses produtos geram processos de volatilidade. Charles Dow, no início do século XX criou índices setoriais, nos quais reunia papéis da mesma

Daniele Ferreira de Sousa

236

Drogas e adolescência: uma análise da ideologia presente na mídia escrita destinada ao grande público  

Microsoft Academic Search

Nowadays, drug use and abuse is an usual topic of debate. In the media, for example, there are several reports about this theme. We analyzed, based on the Theory of Discourse Analysis, four texts about drugs found in magazines directed to adolescents. We tried to find which ideologies are implied by those texts and which effects they can cause on

Tatiana Weiss Ribeiro; Nicolau Kuckartz Pergher; Sandra Djambolakdjian Torossian

1998-01-01

237

New Frontiers AO: Advanced Materials Bi-propellant Rocket (AMBR) Engine Information Summary.  

National Technical Information Service (NTIS)

The Advanced Material Bi-propellant Rocket (AMBR) engine is a high performance (I(sub sp)), higher thrust, radiation cooled, storable bi-propellant space engine of the same physical envelope as the High Performance Apogee Thruster (HiPAT(TradeMark)). To p...

L. C. Liou

2008-01-01

238

The Orbit of 617 Patroclus Binary Trojan System from Keck LGS AO observations  

NASA Astrophysics Data System (ADS)

We report the results from Laser Guide Star Adaptive Optics observations in 2004-2005 of 617 Patroclus using the NIRC2 camera at the W. M. Keck Observatory. An observing campaign which focuses on this only known binary Trojan asteroid, was initiated by our group. Both components of the system were detected at 5 different epochs between Nov. 2004 and May 2005 with an angular separation between 45 and 190 mas and a Dm ˜0.17. The orbital parameters were estimated independently using two algorithms, a Monte-Carlo technique (Hestroffer and Vachier, IAU-ACM, 2005), and a visual binary method (Descamps, Cel. Mech., 2005): a= 685±40 km, e = 0.02±0.02, P = 4.287±0.002 or P= 2.391±0.003 corresponding to a total mass of 1.4 x 1018 or 4.3 x 1018 ± 0.2 kg. Considering recent radiometric measurements by Fernandez et al., (AJ, 126, 2003), the radii of components would be R1= 60.9 km and R2=56.3 km (error ˜1.6 km and with ? =0.94), leading to an averaged bulk density of 0.8 or 2.6 ±0.1 g/cm3. The factor of ˜2 uncertainty in the period will be removed using additional observations from CADC archive (in progress). In contrast to what was observed for a Kuiper-belt binary system (1998WW31 in Veillet et al., Nature, 2002), the low eccentricity is more common of main-belt binaries, indicating that dissipation effects must be considered. This work was partly supported by the National Science Foundation Science and Technology Center for Adaptive Optics and a KPAC NASA grant.

Marchis, F.; Hestroffer, D.; Descamps, P.; Berthier, J.; Bouchez, A. H.; Campbell, R. D.; Chin, J. C. Y.; van Dam, M. A.; Hartman, S. K.; Johansson, E. M.; Lafon, R. E.; Le Mignant, D.; de Pater, I.; Stomski, P. J.; Summers, D. M.; Wizinovitch, P. L.; Wong, M. H.

2005-08-01

239

INTEGRAC ¸ ˜ AO DE M´ ETODOS GEOFISICOS NA MODELAGEM CRUSTAL DA BACIA DE SANTOS  

Microsoft Academic Search

The Santos Basin is a passive margin basin generated during the Neocominian, associated with Gondwana breakup event. The thickness of the sedimentary package reaches 15 km, including rift sequence deposited over thinned crust which originally was 35 km thick. Crustal modeling was performed over 8 lines aiming to recognize the rift phase geometry and estimate the amount of crustal stretching.

Eduardo de Mio; Hung Kiang Chang; Fernando Santos Corr

240

carta ao editor Cross-Reactivity of New Insulin Analogs in Insulin Assays  

Microsoft Academic Search

NSULIN MEASUREMENT HAS important applications in clinical practice. Besides providing information about insulin dynamics in patients with diabetes mellitus and insulin resistance, it has a special place in the differ- ential diagnosis of hypoglycemic conditions. Insulin measurement is based in immunoassay techniques, initially radioimmunoassay (RIA) and nowa- days immunometric assays. One of the advantages of the transition of RIA to

JOSÉ GILBERTO H. VIEIRA; TERESINHA T. TACHIBANA; CLÁUDIA M. FERRER; ANDRÉ F. REIS

2007-01-01

241

A forced titration study of the antioxidant and immunomodulatory effects of Ambrotose AO supplement  

Microsoft Academic Search

BACKGROUND: Oxidative stress plays a role in acute and chronic inflammatory disease and antioxidant supplementation has demonstrated beneficial effects in the treatment of these conditions. This study was designed to determine the optimal dose of an antioxidant supplement in healthy volunteers to inform a Phase 3 clinical trial. METHODS: The study was designed as a combined Phase 1 and 2

Stephen P Myers; Lesley M Stevenson; Phillip A Cheras; Joan O'Connor; Lyndon O Brooks; Margeret I Rolfe; Paul A Connellan; Carol A Morris

2010-01-01

242

76 FR 4726 - Avaya Global Services, AOS Service Delivery, Worldwide Services Group, Including Workers Whose...  

Federal Register 2010, 2011, 2012, 2013

...Services Group, Including Workers Whose Unemployment Insurance (UI) Wages Are Reported...their wages reported through a separate unemployment insurance (UI) tax account under...certification to include workers whose unemployment (UI) wages are reported through...

2011-01-26

243

Simulac ¸ ˜ ao de Grupos de Humanos Virtuais Usando Abordagens Micro e Macrosc´ opicas  

Microsoft Academic Search

This work is inserted on the behavioral animation area, more focused on simulations of social virtual humans which can interact among themselves. The model is divided in three distinct phases which aim to describe i) the individual social evolution until the groups formation, ii) the application of competitive group behaviors and iii) the visualization of the group parameters modifying the

MARTA BECKER; VILLAMIL LUIS; PAULO LUNA DE OLIVEIRA SORAIA; RAUPP MUSSE

244

UM NOVO MODELO MATEM´ ATICO PARA OTIMIZAC ¸ ˜ AO DA CONFIABILIDADE EM ALIMENTADORES  

Microsoft Academic Search

An eletric utility must install protection and sectionaliz ing devices in key points of its distribution network to serve its customers with a relia ble power supply. Utility boards or similar commissions define measures (reliability indices) to quantify, analize, and regulate the eletric utility services. This work presents a nonlinear bi nary programming optimization mo- del that generalizes the already

Debora Z. Bossois; Eduardo Zambon; Berilhes B. Garcia; Elias F. Azeredo

245

Maturação biológica, prática desportiva e somatótipo de crianças e jovens madeirenses dos 10 aos 16 anos  

Microsoft Academic Search

Biological maturation, sports practice and somatotype of children and youth aged 10 to 16 years of Madeira Islands The aim of this study is to quantify the possible changes in somatotype associated with physical activity and biological maturation. The sample comprised 309 subjects (157 boys and 152 girls) aged 10 to 16 years that participated in Madeira Growth Study. Physical

DL Freitas; CA Silva; JA Maia; GP Beunen; AL Rodrigues; MA Thomis

246

Variabilidade espacial de atributos físicos do solo associados ao uso e ocupação da paisagem  

Microsoft Academic Search

This work aimed to diagnose current agricultural soil use as well as its implications for the spatial variability of soil bulk density (Ds), organic matter (OM), particle-size distribution and water dispersible clay (WDC), in Ribeirão Marcela watershed, belonging to Alto Rio Grande region, using geostatistics tools, in order to observe occurrence patterns of these attributes in the landscape. Disturbed and

Natalino M. Gomes; Manoel A. de Faria; Antônio M. da Silva; Carlos R. de Mello; Marcelo R. Viola

2007-01-01

247

Risk Factors Associated with Campylobacter jejuni Infections in Cura?ao, Netherlands Antilles  

PubMed Central

A steady increase in the incidence of Guillain-Barré syndrome (GBS) with a seasonal preponderance, almost exclusively related to Campylobacter jejuni, and a rise in the incidence of laboratory-confirmed Campylobacter enteritis have been reported from Curaçao, Netherlands Antilles. We therefore investigated possible risk factors associated with diarrhea due to epidemic C. jejuni. Typing by pulsed-field gel electrophoresis identified four epidemic clones which accounted for almost 60% of the infections. One hundred six cases were included in a case-control study. Infections with epidemic clones were more frequently observed in specific districts in Willemstad, the capital of Curaçao. One of these clones caused infections during the rainy season only and was associated with the presence of a deep well around the house. Two out of three GBS-related C. jejuni isolates belonged to an epidemic clone. The observations presented point toward water as a possible source of Campylobacter infections.

Endtz, Hubert P.; van West, Hanneke; Godschalk, Peggy C. R.; de Haan, Lidewij; Halabi, Yaskara; van den Braak, Nicole; Kesztyus, Barbara I.; Leyde, Ewald; Ott, Alewijn; Verkooyen, Roel; Price, Lawrence J.; Woodward, David L.; Rodgers, Frank G.; Ang, C. Wim; van Koningsveld, Rinske; van Belkum, Alex; Gerstenbluth, Izzy

2003-01-01

248

DETERMINAÇÃO EXPERIMENTAL DA TENACIDADE AO FRATURAMENTO DO CONCRETO COM CORPOS DE PROVA DO TIPO \\  

Microsoft Academic Search

A methodology has been developed for the determination of the fracture toughness (KIc) of concrete, by controlled deformation tests of short-rod specimens, according to ISRM recommended procedures. Four groups of 18 specimens have been tested, varying strength and coarse aggregate size. Each group has been tested at three different ages. Simultaneously, tests of 150 x 300 mm cylindrical specimens have

Antonio Carlos dos Santos; José Luiz; Túlio Nogueira Bittencourt

249

Do lugar do corpo ao não-lugar da doação de órgãos  

Microsoft Academic Search

The psychological understanding of organ donation must be part of a broader reflection that includes an analysis of the scientific, cultural and medical practices within which the body is conceived contemporarily. Thus, the main purpose of this study was to develop an analysis of the impact caused by organ donation on the relationship that a person establishes with the body,

Pedro Fernando Bendassolli

2000-01-01

250

The Role of Omega-3 Dietary Supplementation in Blepharitis and Meibomian Gland Dysfunction (An AOS Thesis)  

PubMed Central

Purpose Blepharitis and meibomian gland dysfunction (MGD) are common sources of complaints from patients. To evaluate the effect on ocular symptoms, ocular findings, and serum and meibomian gland contents, patients with blepharitis and MGD were prospectively evaluated to determine the effects of dietary supplementation with omega-3 fatty acids. Methods In a prospective randomized placebo-controlled masked trial, patients with simple obstructive MGD and blepharitis, who had discontinued all topical medications and tetracyclines, received oral omega-3 dietary supplementation consisting of two 1000-mg capsules 3 times a day. Patients were examined every 3 months for 1 year with the Ocular Surface Disease Index (OSDI) objective clinical measures, including tear production and stability, ocular surface and meibomian gland health, and biochemical plasma, red blood cell (RBC), and meibum evaluation. Primary outcome measures were change in tear breakup time (TBUT), meibum score, and overall OSDI score at 1 year. Results At 1 year, the omega-3 group had a 36% and 31% reduction in their omega-6 to omega-3 fatty acid ratios in RBCs and plasma, respectively (P = .3), whereas the placebo group demonstrated no change. At 12 months, the omega-3 group had an improvement in TBUT, OSDI score, and meibum score. Changes in meibum content were observed in the omega-3 group (P = .21); the level of meibum saturated fatty acids decreased. Conclusions This trial demonstrated a decrease in the RBC and plasma ratios of omega-6 to omega-3 in patients taking omega-3 dietary supplementation, as compared to controls, and improvements in their overall OSDI score, TBUT, and meibum score. This is the first demonstration of an induced change in the fatty acid saturation content in meibum as a result of dietary supplementation with omega-3 fatty acids.

Macsai, Marian S.

2008-01-01

251

Tolerância ao calor de duas raças de ovinos deslanados no Distrito Federal  

Microsoft Academic Search

RESUMO - O objetivo deste estudo foi avaliar efeitos da temperatura ambiental sobre características fisiológicas de ovinos, no Distrito Federal. Foram selecionados dois grupos de 25 fêmeas vazias ou prenhas das raças Morada Nova e Santa Inês com idade va riando entre dois e quatro anos. As fêmeas tiveram seus dados coletados seis vezes entre os meses de fevereiro e

Maurício Quesada; Concepta McManus; Flávio Augusto D'Araújo Couto

2001-01-01

252

Low-loss ZnO optical waveguides for SAW-AO applications.  

PubMed

Acoustooptic Bragg deflectors (ABDs) with high diffraction efficiencies were fabricated using ZnO thin films deposited on sapphire, glass, and Si substrates by an RF magnetron sputtering system. Optical waveguide losses of the ZnO films were about 0.5 dBcm(-1). Diffraction efficiencies of 95 and 98% for the TE(0) mode beam (at 632.8 nm) were accomplished by acoustic powers of 90 mW in a ZnO film on glass and 80 mW in a ZnO film on Si, respectively. The diffraction efficiencies of the ABD using a ZnO film on sapphire with interdigital transducers of different Q values and with the surface-acoustic-wave propagating along and perpendicular to the c -axis of the ZnO film were also determined. PMID:18285004

Wu, M S; Azuma, A; Shiosaki, T; Kawabata, A

1989-01-01

253

Informática na Fisioterapia: Sistema Multimídia de Apoio ao Aprendizado dos Testes de Força Muscular  

Microsoft Academic Search

This work describes a tutorial system development for the support to muscular strength tests learning. These tests are essential for a physical therapy diagnosis. This subject is crucial for the physical therapist. Its importance and complexity motivated the development of TFM, a multimedia learning support system. It integrates hypertext, movies, animated pictures and sound as recommended by construtivism paradigm. We

Luciana V. Castilho; Heitor S. Lopes; Wagner R. Weinert

254

Área Temática: Recursos Humanos Título: O conceito de estratégia aplicado ao desenvolvimento de carreira AUTORES  

Microsoft Academic Search

This article makes a interdisciplinary study, through the transposition of concepts of the area of Strategy for application in the area of Human Resources. The article was developed from Chapter 3 - Innovation of the Concept of Business, of the book \\

ANDRE FERREIRA; LEONARDO RIBEIRO FUERTH

255

Asteroid (19) Fortuna: Triaxial Ellipsoid Dimensions and Rotational Pole with AO at Gemini North  

NASA Astrophysics Data System (ADS)

The triaxial ellipsoid dimensions and rotational pole of the large asteroid (19) Fortuna were found from only three nights of adaptive optics images in November 2009 at the 8 meter Gemini North telescope at ¸ = 2.15?m. The dimensions and pole, as well as images, are supported by the model derived from lightcurve inversions [4] and stellar occultations. Fortuna should perhaps be considered a candidate for a Standard Triaxial Ellipsoid [2].

Drummond, J.; Merline, W. J.; Conrad, A.; Christou, J.; Tamblyn, P.; Carry, B.

2011-10-01

256

Key Learning Competencies across Place and Time: Kimihia Te Ara Totika, Hei Oranga Mo To Ao  

ERIC Educational Resources Information Center

|The overarching aim of this research in the proposal was the following: In a number of early childhood centres and early years school classrooms that have already begun to explore in this area, to investigate effective pedagogy designed to develop five learning competencies over time. This project was developed in response to curriculum reform in…

Carr, Margaret; Peters, Sally; Davis, Keryn; Bartlett, Claire; Bashford, Nadine; Berry, Paula; Greenslade, Susie; Molloy, Sue; O'Connor, Nikki; Simpson, Mere; Smith, Yvonne; Williams, Tina; Wilson-Tukaki, Andrea

2008-01-01

257

RESPOSTAS METABÓLICAS E HORMONAIS AO TREINAMENTO FÍSICO METABOLIC AND HORMONAL RESPONSES TO PHYSICAL TRAINING  

Microsoft Academic Search

The objective of this study was to elucidate the main metabolic and hormonal responses to physical training, as well as, to establish a relation of these metabolites with the overreaching, overtraining syndrome and exercise intensity. For this it was made a literature review of national and international periodicals and books related to the issue. Exercise causes diverse metabolic and functional

Lívia Pascoti Lapin; Jonato Prestes

2007-01-01

258

Phase relationships in Nb-18.7 a/o Si in-situ composite  

SciTech Connect

This study will identify the crystallographic orientation relationships between the niobium and silicide phases in the cast, the cast and extruded, and the directionally solidified (DS) materials. Habit plane relationships will be experimentally identified and compared with atom site models of the crystallographic planes.

Cockeram, B.; Lipsitt, H.A.; Inivasan, R.; Weiss, I.

1991-12-31

259

ADAPTAÇÃO AO CLIMATERIO E A AÇÃO DA ENFERMEIRA ADAPTATION TO CLIMACTERIC AND NURSE ACTION  

Microsoft Academic Search

The climacteric is the transition period of the life of the woman marked by menopause and characterized by symptoms that often affect the welfare of women that feel. It is more attention to the woman in fertile age and it is necessary that the nurse prepares himself to woman attention in the climacteric period. The study aimed to evaluate the

Bruna Émile; Gualberto Dias; Eneida Coimbra Lima

260

589 nm sum-frequency generation laser for the LGS\\/AO of Subaru Telescope  

Microsoft Academic Search

We developed a high power and high beam quality 589 nm coherent light source by sum-frequency generation in order to utilize it as a laser guide star at the Subaru telescope. The sum-frequency generation is a nonlinear frequency conversion in which two mode-locked Nd:YAG lasers oscillating at 1064 and 1319 nm mix in a nonlinear crystal to generate a wave

Yoshihiko Saito; Yutaka Hayano; Norihito Saito; Kazuyuki Akagawa; Akira Takazawa; Mayumi Kato; Meguru Ito; Stephen Colley; Matthew Dinkins; Michael Eldred; Taras Golota; Olivier Guyon; Masayuki Hattori; Shin Oya; Makoto Watanabe; Hideki Takami; Masanori Iye; Satoshi Wada

2006-01-01

261

Na layer variability and implications for LGS adaptive optics: determination, analysis and impact on AO correction  

NASA Astrophysics Data System (ADS)

The concept of the laser guide star was proposed by Foy and Labeyrie, 1985. The Laser Guide Stars (LGS) depend on the abundance and distribution of sodium in the mesosphere. The mesopheric sodium often appears to consist of more than one layer, each of which exhibits time variation in density and altitude. The non-zero thickness and finite range of the layers results in elongation of the LGS defocus on extremely large telescopes such as TMT and VLT. Na variability will be examined for determination, analysis and impact on Adaptive Optics aberration correction.

Jones, Katharine J.

2010-08-01

262

Beam splitter for multibeam A/O modulators and printer systems  

US Patent & Trademark Office Database

A scanning system with unpolarized laser, a birefringent beam splitter to split the unpolarized beam into dual orthogonally polarized beams, a polarization insensitive unitary dual beam modulator for separately modulating the beams in accordance with discrete image signal inputs, and a control for operating the modulator at optimum acoustic power levels. In an alternate embodiment, a quarter wave plate is inserted in the optical path between laser and beam splitter.

Daniele; Joseph J. (Pittsford, NY); Yip; Kwok-leung (Webster, NY)

1988-03-22

263

Modeling anisoplanatism in the Keck II laser guide star AO system  

NASA Astrophysics Data System (ADS)

Anisoplanatism is a primary source of photometric and astrometric error in single-conjugate adaptive optics. We present initial results of a project to model the off-axis optical transfer function in the adaptive optics system at the Keck II telescope. The model currently accounts for the effects of atmospheric anisoplanatism in natural guide star observations. The model for the atmospheric contribution to the anisoplanatic transfer function uses contemporaneous MASS/ DIMM measurements. Here we present the results of a validation campaign using observations of naturally guided visual binary stars under varying conditions, parameterized by the r0 and ?0 parameters of the C2n atmospheric turbulence profile. We are working to construct a model of the instrumental field-dependent aberrations in the NIRC2 camera using an artificial source in the Nasmyth focal plane. We also discuss our plans to extend the work to laser guide star operation.

Fitzgerald, Michael P.; Witzel, Gunther; Britton, Matthew C.; Ghez, Andrea M.; Meyer, Leo; Sitarski, Breann N.; Cheng, Carina; Becklin, Eric E.; Campbell, Randall D.; Do, Tuan; Lu, Jessica R.; Matthews, Keith; Morris, Mark R.; Neyman, Christopher R.; Tyler, Glenn A.; Wizinowich, Peter L.; Yelda, Sylvana

2012-07-01

264

Synthesis of a-O- and a-S-Glycosphingolipids Related to Sphingomonous cell Wall Antigens Using Anomerisation.  

PubMed

Analogues of glycolipids from Spingomonadacaece with O- and S- and SO2-linkages have been prepared using chelation induced anomerisation promoted by TiCl4. Included are examples of the anomerisation of intermediates with O- and S-glycosidic linkages as well as isomerisation of ?-thioglycuronic acids (?-glycosyl thiols). The ?-O-glucuronide and ?-O-galacturonide precursors were efficiently prepared using benzoylated trichloroacetimidates. ?-Glycosyl thiols were precursors to ?-S-derivatives. Triazole containing mimics of the natural glycolipids were prepared using CuI promoted azide-alkyne cycloaddition reactions in THF. The glycolipid antigens are being evaluated currently for their effects on iNKT cells. PMID:24036511

Pilgrim, Wayne; O'Reilly, Ciaran; Murphy, Paul V

2013-09-12

265

Bases científicas do acolhimento amoroso ao Recém-Nascido Scientific rationale for humanized care of the newborn  

Microsoft Academic Search

Objective: To describe the scientific rationale for humanized care of the newborn. Source of data: The study was based on publications available through MEDLINE, LILACS and the Brazilian Ministry of Health. Synthesis of data: Neuroscience and psychology explain how brain organization and future skill building depend on early experiences of the newborn. Conclusions: Health care professionals should be aware of

Ana Júlia; Couto de Alencar; Karla Maria Carneiro Rolim

266

Antifungal Activity of a Phytoterpenoid (AOS-A) Isolated from Artabotrytis odoratissimus on Spore Germination of Some Fungi.  

PubMed

Phytoterpenoid isolated from Artabotrytis odoratissimus inhibited spore germination of some plant pathogenic as well as saprophytic fungi e.g. Alternaria alternata, A. solani, Cercospora sp., Curvularia maculans, C. pennisetti, Fusarium udum, Helminthosporium echinochlova, H. frumentacie, H. penniseti and Ustilago cynodontis. In Curvularia maculans and H. frumentacie, spore germination was completely inhibited at 2000 ppm. However, Curvularia maculans and C. pennisetti showed considerable sensitivity to this chemical even at 500 ppm. PMID:24039483

Singh, D K; Basha, S Ameer; Sarma, B K; Pandey, V B; Srivastava, J S

2006-09-30

267

Purification of Cytochrome P450 and Ferredoxin, Involved in Bisphenol A Degradation, from Sphingomonas sp. Strain AO1  

Microsoft Academic Search

convert BPA. The Km and kcat values for BPA degradation were 85 4.7 M and 3.9 0.04 min 1 , respectively. NADPH, spinach ferredoxin, and spinach ferredoxin reductase resulted in weak monooxygenase activity. These results indicated that the electron transport system of P450bisd might exhibit strict specificity. Two BPA degradation products of the P450bisd system were detected by high-performance liquid

Miho Sasaki; Ayako Akahira; Ko-ichi Oshiman; Tetsuaki Tsuchido; Yoshinobu Matsumura

2005-01-01

268

76 FR 19753 - Intent To Prepare a Draft Environmental Impact Statement for the `?ao Stream Flood Control...  

Federal Register 2010, 2011, 2012, 2013

...significant impacts associated with impairment of groundwater recharge, sediment loading impacts to native aquatic species...grade control structures; stilling basin areas; groundwater infiltration areas; natural erosion...

2011-04-08

269

Soldier crab ( Dotilla myctiroides) distribution, food resources and subsequent role in organic matter fate in Ao Tang Khen, Phuket, Thailand  

NASA Astrophysics Data System (ADS)

This study aimed to elucidate Dotilla myctiroides (H. Milne-Edwards) food resources and how the soldier crab influences the organic matter composition on the intertidal flat. A preliminary assessment of D. myctiroides size, sex, and population distribution was conducted to clarify the characteristics of the inhabiting population. Overall, D. myctiroides size and abundance was normal across the tidal flat area. Comparison of different sediment types from the soldier crab habitat (surface sediments, igloos, burrow lining, burrow pellets, feeding pellets, and feces) using the fatty acid (FA) analysis technique revealed D. myctiroides removes organic matter via the significantly lower contributions of polyunsaturated FAs, essential FAs, and dinoflagellates in the feeding pellets. Dotilla myctiroides tissue analysis of the hepatopancreas and hindgut in individuals that had been starved for 24 h confirmed not only the consumption of dinoflagellates, but diatoms and macroalgae as well. In addition, the FA metabolism within the digestive system implied the ability of the soldier crab to synthesize highly unsaturated FAs (HUFAs) such as 20:4 n-6, 20:5 n-3 and 22:6 n-3.

Takagi, Kimberly K.; Cherdsukjai, Phaothep; Mimura, Izumi; Yano, Yuka; Adulyanukosol, Kanjana; Tsuchiya, Makoto

2010-05-01

270

Exigências nutricionais da grápia ao fósforo e enxofre em Argissolo Vermelho distrófico arênico: efeito da adubação no crescimento  

Microsoft Academic Search

Grápia (Apuleia leiocarpa Vog. Macbride) is an important native forest species that has been in extinction process. The aim of this study was to determine the optimum levels of phosphorus and sulfur fertilization on the initial growth of grápia. Grápia plants were cultivated in pots containing 3.5kg of a Paleudalf soil, under unclimatized glasshouse conditions. Sixteen fertilization treatments were used

Evandro Luiz Missio; Fernando Teixeira Nicoloso; Gladis de Oliveira Jucoski; Lucas Sartori

2004-01-01

271

IMPLEMENTAÇÃO DO MODELO NUMÉRICO DA UNIVERSIDADE DE PRINCETON NO ESTUDO DA CIRCULAÇÃO OCEÂNICA AO LONGO DA COSTA PERUANA  

Microsoft Academic Search

The objective was to realize the tuning of the Princeton Ocean Model (POM) along the Peruvian coast at 5°N and 45°S. The model was developed by finite difference schemes of gridded type (called Arakawa-C staggered grid) and we studied the oceanic circulation relative to the period of interest 1991-2001. The methodology of the tuning the model was: (1) to generate

E. Aguirre; E. Campos

272

48 CFR 301.603-75 - Training requirement for purchase cardholders, Approving Officials (AOs), and Agency/Organization...  

Code of Federal Regulations, 2010 CFR

...2009-10-01 false Training requirement for...and Agency/Organization Program Coordinators...SYSTEM Career Development, Contracting Authority...301.603-75 Training requirement for...and Agency/Organization Program Coordinators...OPCs are listed in the following...

2009-10-01

273

Monitoring Io volcanic activity using the Keck AO system: 2-5mum sunlit and eclipse observations  

Microsoft Academic Search

Galileo provided us with spectacular images of the volcanically active Io moon over the last 7 years, but we understand little about the physical processes occurring on this moon. Groundbased monitoring programs help characterize the long time evolution of Io's volcanic activity, such as the frequency, spatial distribution and temperature of hot spots and outbursts. Our group started a monitoring

F. Marchis; I. de Pater; D. Le Mignant; H. G. Roe; T. Fusco; J. R. Graham; R. Prange; B. Macintosh

2002-01-01

274

Optical design of FRIDA, the integral-field spectrograph and imager for the AO system of the Gran Telescopio Canarias  

NASA Astrophysics Data System (ADS)

FRIDA (inFRared Imager and Dissector for the Adaptive optics system of the Gran Telescopio Canarias) has been designed as a diffraction limited instrument that will offer broad and narrow band imaging and integral field spectroscopy (IFS) capabilities with low, intermediate and high spectral resolutions to operate in the wavelength range 0.9 - 2.5 ?m. The integral field unit is based on a monolithic image slicer based on the University of Florida FISICA. Both, the imaging mode and IFS observing modes will use the same Rockwell 2K×2K detector. FRIDA will be based at a Nasmyth focus of GTC, behind the GTCAO system. The FRIDA optical design, stray light analysis, tolerance analysis and manufacturing feasibility are described in this contribution.

Cuevas, Salvador; Eikenberry, Stephen S.; Sánchez, Beatriz; Chapa, Oscar; Espejo, Carlos; Flores-Meza, Rubén; Lara, Gerardo; Álvarez, Luis C.; Keiman, Carolina

2008-08-01

275

Seletividade de alguns agrotóxicos em uso na citricultura ao ácaro predador Neoseiulus californicus (McGregor) (Acari: Phytoseiidae)  

Microsoft Academic Search

This work was carried out to determine the residual toxicity of the main pesticides used in citrus, on Neoseiulus californicus (McGregor) under laboratory conditions. For this, it was used the residual contact bioassay. Citrus leaves of the variety \\

Marcos Zatti da Silva; Carlos Amadeu Leite de Oliveira

2006-01-01

276

A Keck LGS AO Search for Brown Dwarf and Planetary Mass Companions to Upper Scorpius Brown Dwarfs  

NASA Astrophysics Data System (ADS)

We searched for binary companions to 20 young brown dwarfs in the Upper Scorpius association (145 pc, 5 Myr, nearest OB association) with the Laser Guide Star adaptive optics system and the facility infrared camera NIRC2 on the 10 m Keck II telescope. We discovered a 0farcs14 companion (20.9 ± 0.4 AU) to the <0.1 M sun object SCH J16091837-20073523. From spectral deconvolution of integrated-light near-IR spectroscopy of SCH1609 using the SpeX spectrograph (Rayner et al. 2003), we estimate primary and secondary spectral types of M6 ± 0.5 and M7 ± 1.0, corresponding to masses of 79 ± 17 M Jup and 55 ± 25 M Jup at an age of 5 Myr and masses of 84 ± 15 M Jup and 60 ± 25 M Jup at an age of 10 Myr. For our survey objects with spectral types later than M8, we find an upper limit on the binary fraction of <9% (1?) at separations of 10-500 AU. We combine the results of our survey with previous surveys of Upper Sco and similar young regions to set the strongest constraints to date on binary fraction for young substellar objects and very low mass stars. The binary fraction for low-mass (<40 M Jup) brown dwarfs in Upper Sco is similar to that for T dwarfs in the field; for higher mass brown dwarfs and very low mass stars, there is an excess of medium-separation (10-50 AU projected separation) young binaries with respect to the field. These medium-separation binaries will likely survive to late ages.

Biller, Beth; Allers, Katelyn; Liu, Michael; Close, Laird M.; Dupuy, Trent

2011-03-01

277

76 FR 52972 - United States v. Regal Beloit Corp. and A.O. Smith Corp.; Proposed Final Judgment and Competitive...  

Federal Register 2010, 2011, 2012, 2013

...service marks, or service names ``Regal Beloit,'' ``Marathon,'' ``Leeson,'' ``FASCO,'' ``imPower,'' and...trademarks, trade names, service marks, or service names ``Marathon,'' ``Leeson,'' ``FASCO,'' ``imPower,''...

2011-08-24

278

Prospective Evaluation of Visual Acuity Assessment: A Comparison of Snellen Versus ETDRS Charts in Clinical Practice (An AOS Thesis)  

PubMed Central

Purpose: The purpose of this study was twofold: first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a “real world” retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts starting at 4 or 2 meters. Methods: Prospective, consecutive evaluation of patients who underwent best-corrected visual acuity testing of their right eye performed at a single seating by the same experienced, certified vision examiner in the same room with standardized low light conditions using a projected Snellen chart at 20 feet, and two different back-illuminated ETDRS charts placed 4 and 2 meters from the patient. Results: One hundred sixty-three eyes were included in the study. The mean Snellen VA was 0.67 logMAR (20/94), ETDRS VA at 4 meters was 0.54 logMAR (~20/69), and ETDRS VA at 2 meters was 0.51 logMAR (~20/65). The mean difference was 6.5 letters better on the ETDRS chart (P=.000000001). As the VA worsened, there was increased variability between the charts and the mean discrepancy between charts also increased. Subgroup analysis revealed the greatest difference between charts was in the poor vision subgroup (<20/200) with a difference of 0.2 logMAR (10 letters; P=.0000002). Patients with exudative age-related macular degeneration (AMD) had the greatest disparity on vision testing, but patients with dry AMD and diabetic retinopathy also exhibited significant differences. Conclusions: Visual acuity scores were significantly better on ETDRS charts compared to Snellen charts. The difference was greatest with poor visual acuity (<20/200) and in patients with exudative AMD. Thus, caution should be exercised when comparing data using the different charts.

Kaiser, Peter K.

2009-01-01

279

Measurement of the O2(a1A)-O2(X3E) ratio using Raman spectroscopy  

Microsoft Academic Search

A spontaneous Raman scattering system has been developed which can monitor the yield of a COIL singlet oxygen generator performance in real time. This approach permits one to directly measure [O2(a1(Delta) )] and [O2((Chi) 3(Sigma) )] simultaneously by monitoring their Raman spectra on the same ICCD array. This technique is reviewed and the major sources of error discussed and analyzed.

William E. McDermott

2000-01-01

280

First Biological and Dosimetric Results of the Free Flyer Biostack Experiment AO015 on LDEF (Abstract Only).  

National Technical Information Service (NTIS)

The main objectives of the Biostack Experiment are to study the effectiveness of the structured components of the cosmic radiation to bacterial spores, plant seeds, and animal cysts for a long duration spaceflight and to get dosimetric data such as partic...

G. Reitz H. Buecker R. Facius G. Horneck M. Schaeffer

1991-01-01

281

ENSAIO REFERENTE AO PROCESSO DE CONSOLIDAÇÃO E DESENVOLVIMENTO DA EQUIPE DE VOLEIBOL FEMININO REXONA (1997-2003)  

Microsoft Academic Search

The central problematic of this rehearsal delimit t he comprehension report of as Rexona's women professional team has been inserted in the sports' field and which was the internal structure movement that caused the transfer of the team from Curitiba. For the achievement of the proposed objec tive, a qualitative case study. The results had indicated that the insertion of

Mnda. Bárbara Schausteck de Almeida

282

O GÊNERO ORIENTAÇÃO DE MESTRADO: ESTUDO DE CASO RELATIVO AO PERÍODO DE ESCRITURA DO PROJETO DE PESQUISA DE UM MESTRANDO  

Microsoft Academic Search

The present paper investigated a postgrad uate student's research. The genre was investigated through the methodology of descriptive case study. In the theoretical foundations of the research were taken into consideration the notions of genre, the discursive community (Swales, 1990) and the system of activiti es (Bazerman, 2004). Six sessions were analyzed, recor ded in audio, aiming to analyze the

Kelly Cristina

283

Indicadores biológicos associados ao ciclo do fósforo em solos de Cerrado sob plantio direto e plantio convencional  

Microsoft Academic Search

The objective of this work was to evaluate the effects of no-till, conventional tillage and cover crops on biological indicators associated to the P cycle. The work was carried out on three adjacent areas on a Red- Yellow Oxisol: area I, a two-year experiment comparing the two management systems; area II, a six-year experiment, and area III, a native Cerrado

Roberto Guimarães Carneiro; Iêda de Carvalho Mendes; Paulo Emílio Lovato; Arminda Moreira de Carvalho; Lúcio José Vivaldi

2004-01-01

284

Consumo de cafeína entre gestantes e a prevalência do baixo peso ao nascer e da prematuridade: uma revisão sistemática  

Microsoft Academic Search

This article reports on a systematic review of studies on caffeine intake during pregnancy and prevalence of low birth weight and prematurity, focusing on methods to quantify intake and con- trol for confounding. The review consisted of an article search from 1996 to 2006 in MEDLINE, LILACS, and PubMed, using the key words: \\

Alice Helena de Resende; Nóra Pacheco; Nathália Silva; Raposo Barreiros; Iná S. Santos; Gilberto Kac

2007-01-01

285

Keck and VLT AO observations and models of the uranian rings during the 2007 ring plane crossings  

NASA Astrophysics Data System (ADS)

We present observations of the uranian ring system at a wavelength of 2.2 ?m, taken between 2003 and 2008 with NIRC2 on the W.M. Keck telescope in Hawaii, and on 15–17 August 2007 with NaCo on the Very Large Telescope (VLT) in Chile. Of particular interest are the data taken around the time of the uranian ring plane crossing with Earth on 16 August 2007, and with the Sun (equinox) on 7 December 2007. We model the data at the different viewing aspects with a Monte Carlo model to determine: (1) the normal optical depth ?0, the location, and the radial extent of the main rings, and (2) the parameter A?0 (A is the particle geometric albedo), the location, and the radial plus vertical extent of the dusty rings. Our main conclusions are: (i) The brightness of the ? ring is significantly enhanced at small phase and ring inclination angles; we suggest this extreme opposition effect to probably be dominated by a reduction in interparticle shadowing. (ii) A broad sheet of dust particles extends inwards from the ? ring almost to the planet itself. This dust sheet has a vertical extent of ˜140 km, and A?0 = 2.2 × 10?6. (iii) The dusty rings between ring 4 and the ? ring and between the ? and ? rings are vertically extended with a thickness of ˜300 km. (iv) The ? ring extends from ˜41,350 km almost all the way inwards to the planet. The main ? ring, centered at ˜39,500 km from the planet, is characterized by A?0 = 3.7 × 10?6; this parameter decreases closer to the planet. The ? ring has a full vertical extent of order 800–900 km, with a pronounced density enhancement in the mid-plane. (v) The ?c ring is optically thin and less than several tens of km in the vertical direction. This ring may be composed of macroscopic material, surrounded by clumps of dust.

de Pater, Imke; Dunn, David E.; Stam, Daphne M.; Showalter, Mark R.; Hammel, Heidi B.; Min, Michiel; Hartung, Markus; Gibbard, Seran G.; van Dam, Marcos A.; Matthews, Keith

2013-11-01

286

PEQUENAS EMPRESAS DE FAST FOOD: UMA ANÁLISE JUNTO AO CLIENTE SOBRE A QUALIDADE DO ATENDIMENTO NO SEGMENTO DE ALIMENTAÇÃO RÁPIDA  

Microsoft Academic Search

In the fast food industry has generated billions o f dollars around the globe. In the seventies, Americans have to spend more than six bi llion dollars in this type of meal, in the year two thousand, that figure was up to eighteen t imes greater. The three major U.S. networks Burger King, McDonald's and Tricon Global Restaurants, every two

Cléber Alves Ferreira

287

RESISTÊNCIA INDUZIDA AO PULGÃO-GIGANTE-DO-PINUS (HEMIPTERA: APHIDIDAE) EM PLANTAS DE PINUS TAEDA ADUBADAS COM SILÍCIO ( 1 )  

Microsoft Academic Search

INDUCED RESISTANCE EFFECT TO THE GIANT CONIFER APHID (HEMIPTERA:APHIDIDAE) IN SILICON FERTILIZED PLANTS OF PINUS TAEDA This research aimed to study the effect of silicon as a resistance inducer in P. taeda L. to C. atlantica (Wilson). Preference and reproductive rate tests were performed in plants of P. taeda with and without silicon application. The experiment was carried out in

JOELMA MELISSA; MALHERBE CAMARGO; JAIR CAMPOS MORAES; EDILSON BATISTA DE OLIVEIRA; EDSON TADEU

2008-01-01

288

[Primary stability of AO-plate osteosynthesis of the lower cervical spinal column. III. Posterior and combined spondylodesis. Conclusions].  

PubMed

For evaluation of stability changes-concerning primary stability of the lower cervical spine either posterior ASIF plate fixation according to Roy-Camille or combined fixation (anterior H plate and posterior plate fixation according to Roy-Camille) were performed for arteficially produced fracture-dislocations of the lower cervical spine on cadavers. Functional loading was simulated by a mechanical device ensuring 10 000 flexion and extension movements on the corpses. Tensile moments determined by a screwdriver measuring the turning moment were compared with the release moment examined on screws following functional loading, unloaded free screws were used as reference. Decreasing of stability depending on the type of the injury has come posteriorly to 2,52-18,65%, anteriorly to 0,57-20% of the primary rate. It has been established that external fixation is not warranted in the postoperative treatment of patients with fracture dislocations of the lower cervical spine following either ASIF plate fixation according to Roy-Camille or combined plate fixation. General rules of the operative fracture management are valid for treatment of the cervical spine built of segmental elements. PMID:4002764

Sándor, L

1985-01-01

289

Antifungal Activity of a Phytoterpenoid (AOS-A) Isolated from Artabotrytis odoratissimus on Spore Germination of Some Fungi  

PubMed Central

Phytoterpenoid isolated from Artabotrytis odoratissimus inhibited spore germination of some plant pathogenic as well as saprophytic fungi e.g. Alternaria alternata, A. solani, Cercospora sp., Curvularia maculans, C. pennisetti, Fusarium udum, Helminthosporium echinochlova, H. frumentacie, H. penniseti and Ustilago cynodontis. In Curvularia maculans and H. frumentacie, spore germination was completely inhibited at 2000 ppm. However, Curvularia maculans and C. pennisetti showed considerable sensitivity to this chemical even at 500 ppm.

Singh, D. K.; Basha, S. Ameer; Sarma, B. K.; Pandey, V. B.

2006-01-01

290

Proposta de Informatização de um Processo de Prescrição de Atividade Física Integrado ao Prontuário Eletrônico do Paciente  

Microsoft Academic Search

Introduction: The physical activity as well as exercise, become allies in prevention of diseases, especially those of chronic degenerative character. While it is agreed that the practice of physical exercise has a beneficial role for the health of the population especially for the elderly, the health professional for lack of specific training, find great difficulty in steer and guide their

Eduardo Fernando; Cianci Gomes; Ivan Torres Pisa; Claudia Galindo; Novoa Barsottini

291

A fuzzy neural network model for monitoring A²/O process using on-line monitoring parameters.  

PubMed

An adaptive network based fuzzy inference system (ANFIS) model was employed to predict effluent chemical oxygen demand (COD(eff)) and ammonia nitrogen (NH(4)(+) (eff)) from an anaerobic/anoxic/oxic (A(2)/O) process, and meanwhile a self-adapted fuzzy c-means clustering algorithm was used to identify the model's architecture and optimize fuzzy rules. When constructing the model or predicting, the on-line monitoring parameters, namely hydraulic retention time (HRT), influent pH (pH), dissolved oxygen in the aerobic reactor (DO) and mixed-liquid return ratio (r), were adopted as the input variables. Compared with the artificial neural network (ANN) model whose weight vector was optimized by a real-code genetic algorithm (GA), the ANFIS presented better estimate performance. When predicting, the mean absolute percentage errors (MAPEs) of 1.8458% and 2.8984% for COD(eff) and NH(4)(+) (eff) could be achieved using ANFIS; the root mean square errors (RMSEs) for COD(eff) and NH(4)(+) (eff) were 1.6317 and 0.1291, respectively; the correlation coefficient (R) values of 0.9928 and 0.9951 for COD(eff) and NH(4)(+) (eff) could also be achieved. The results indicated that reasonable monitoring A(2)/O process performance, just using on-line monitoring parameters, has been achieved through the ANFIS. PMID:22416869

Hu, Kang; Wan, Jin Q; Ma, Yong W; Wang, Yan; Huang, Ming Z

2012-01-01

292

Respostas Agudas Hemodinâmicas Relacionadas ao Teste de Cooper em Militares Acute Hemodynamic Responses Related to the Cooper Test Applied to Servicemen  

Microsoft Academic Search

Background: As the elite troops of the Brazilian Armed Forces, Marines and Paratroopers must undergo tough physical training. However, hemodynamic variables are shown to be largely insignificant and unexplored as ways of marking cardiovascular behavior in response to military training. Objective: To examine the behavior of hemodynamic variables among Brazilian servicemen in different military organizations (Marines and Paratroopers) before and

Alex Souto Maior; Luís Gustavo; Machado Lima

293

Spectral Domain Optical Coherence Tomography in Glaucoma: Qualitative and Quantitative Analysis of the Optic Nerve Head and Retinal Nerve Fiber Layer (An AOS Thesis)  

PubMed Central

Purpose: To demonstrate that video-rate spectral domain optical coherence tomography (SDOCT) can qualitatively and quantitatively evaluate optic nerve head (ONH) and retinal nerve fiber layer (RNFL) glaucomatous structural changes. To correlate quantitative SDOCT parameters with disc photography and visual fields. Methods: SDOCT images from 4 glaucoma eyes (4 patients) with varying stages of open-angle glaucoma (ie, early, moderate, late) were qualitatively contrasted with 2 age-matched normal eyes (2 patients). Of 61 other consecutive patients recruited in an institutional setting, 53 eyes (33 patients) met inclusion/exclusion criteria for quantitative studies. Images were obtained using two experimental SDOCT systems, one utilizing a superluminescent diode and the other a titanium:sapphire laser source, with axial resolutions of about 6 ?m and 3 ?m, respectively. Results: Classic glaucomatous ONH and RNFL structural changes were seen in SDOCT images. An SDOCT reference plane 139 ?m above the retinal pigment epithelium yielded cup-disc ratios that best correlated with masked physician disc photography cup-disc ratio assessments. The minimum distance band, a novel SDOCT neuroretinal rim parameter, showed good correlation with physician cup-disc ratio assessments, visual field mean deviation, and pattern standard deviation (P values range, .0003–.024). RNFL and retinal thickness maps correlated well with disc photography and visual field testing. Conclusions: To our knowledge, this thesis presents the first comprehensive qualitative and quantitative evaluation of SDOCT images of the ONH and RNFL in glaucoma. This pilot study provides basis for developing more automated quantitative SDOCT-specific glaucoma algorithms needed for future prospective multicenter national trials.

Chen, Teresa C.

2009-01-01

294

Comunicação relacionada ao uso de agrotóxicos em região agrícola do Estado do Rio de Janeiro Pesticide use reporting in a rural area of Rio de Janeiro state, Brazil  

Microsoft Academic Search

Objective To assess communications aspects related to pesticide use in a rural area of the Rio de Janeiro state, Brazil. Methods The study was carried out in the area of São Lourenço stream. It was based on methodological triangulation comprising: semi-structured interviews and observation of a local population sample (about 600 inhabitants); structured questionnaire to collect data on the local

Frederico Peres; Brani Rozemberg; Sérgio Rabello Alves; Josino Costa Moreira; Jefferson José Oliveira-Silva

295

Conversores Estaticos de Potencia: Estudo Teorico e Experimental com Vista aos Accionamentos com Maquina Assincrona (Static Power Converters: Theoretical and Experimental Study in View of Asynchronous Motor Drives).  

National Technical Information Service (NTIS)

The work deals with several subjects related to static power converters, specially those concerning topologies and command techniques, with the purpose to build a conceptual basis for the application on asynchronous motor drives. The topologies of those c...

J. C. P. da Palma

1988-01-01

296

Insights into the architecture and stoichiometry of Escherichia coli PepAoDNA complexes involved in transcriptional control and site-specific DNA recombination by atomic force microscopy  

PubMed Central

Multifunctional Aminopeptidase A (PepA) from Escherichia coli is involved in the control of two distinct DNA transaction processes: transcriptional repression of the carAB operon, encoding carbamoyl phosphate synthase and site-specific resolution of ColE1-type plasmid multimers. Both processes require communication at a distance along a DNA molecule and PepA is the major structural component of the nucleoprotein complexes that underlie this communication. Atomic Force Microscopy was used to analyze the architecture of PepA·carAB and PepA·cer site complexes. Contour length measurements, bending angle analyses and volume determinations demonstrate that the carP1 operator is foreshortened by ?235 bp through wrapping around one PepA hexamer. The highly deformed part of the operator extends from slightly upstream of the –35 hexamer of the carP1 promoter to just downstream of the IHF-binding site, and comprises the binding sites for the PurR and RutR transcriptional regulators. This extreme remodeling of the carP1 control region provides a straightforward explanation for the strict requirement of PepA in the establishment of pyrimidine and purine-specific repression of carAB transcription. We further provide a direct physical proof that PepA is able to synapse two cer sites in direct repeat in a large interwrapped nucleoprotein complex, likely comprising two PepA hexamers.

Minh, Phu Nguyen Le; Devroede, Neel; Massant, Jan; Maes, Dominique; Charlier, Daniel

2009-01-01

297

Contribuicao ao estudo de recuperacao e recristalizacao do zircaloy-4 laminado a frio. (Contribution to study on recovery and recrystallization of cold rolling zircaloy-4).  

National Technical Information Service (NTIS)

Recovery and recrystallization of work-hardened (40-60% - Cold rolling) Zircaloy-4 were studied between 200 and 600(sup 0) C with times varying from 15 to 240 minutes, from electrical resistance and hardness measurements. Activation energy calculation for...

A. I. C. Persiano

1977-01-01

298

Intravitreous Bevacizumab in the Treatment of Macuar Edema from Branch Retinal Vein Occlusion and Hemisphere Retinal Vein Occlusion (An AOS Thesis)  

PubMed Central

Purpose To compare intravitreous bevacizumab to other current treatments of branch retinal vein occlusion (BRVO) and hemisphere retinal vein occlusion (HRVO) with consideration to visual outcome, cost, convenience, and risk of treatment. Methods This is a retrospective chart review from a large referral retina practice. The data comprise 56 patients with BRVO and HRVO treated by intravitreous bevacizumab, with and without intravitreous triamcinolone acetonide. Initial visual acuities at the time of first bevacizumab injection, best acuities through the follow-up time, final acuity at last visit before review, initial macular thickness, and final macular thickness were measured. Changes in vision and thickness were calculated, as were the percentage of eyes improving, stabilizing, and worsening. Results The data were compared to composite data derived from several current treatments of BRVO. The subgroup of 39 eyes that received only bevacizumab without triamcinolone acetonide had the most improvement in vision. The median change in visual acuity was 1.5 lines (P = .012) over a mean follow-up of 8.8 months. Twenty-three eyes (59%) improved visually, with 20 eyes (51%) improving 2 or more lines. These results are similar to those for eyes that received argon grid laser and chorioretinal anastomosis, but are worse than in eyes that received arteriovenous adventitial sheathotomy, macular decompression surgery, and intravitreous triamcinolone acetonide. Conclusions Visual benefit from intravitreous bevacizumab compares well against laser treatments for BRVO and HRVO but not as well opposed to surgical techniques and intravitreous triamcinolone acetonide. Intravitreous bevacizumab injection has a risk, cost, and convenience profile that is favorable.

Fish, Gary Edd

2008-01-01

299

INTRAVITREOUS BEVACIZUMAB IN THE TREATMENT OF MACUAR EDEMA FROM BRANCH RETINAL VEIN OCCLUSION AND HEMISPHERE RETINAL VEIN OCCLUSION (AN AOS THESIS)  

Microsoft Academic Search

Purpose: To compare intravitreous bevacizumab to other current treatments of branch retinal vein occlusion (BRVO) and hemisphere retinal vein occlusion (HRVO) with consideration to visual outcome, cost, convenience, and risk of treatment. Methods: This is a retrospective chart review from a large referral retina practice. The data comprise 56 patients with BRVO and HRVO treated by intravitreous bevacizumab, with and

Gary Edd

300

Cervico-cephalic Medial Screw Migration after Intertrochanteric Fracture Fixation, OTA/AO 31-A2, Using Intramedullary Nail Gamma3®. Report of 2 Cases and Literature Review.  

PubMed

SUMMARY:: Cervico-cephalic screw medialization is a rare complication after intertrochanteric fracture synthesis with a Gamma3® type intramedullary nail. Only 6 cases of intrapelvic penetration by Gamma 3® lag screw have been described. We now describe two additional cases and a review of the literature. PMID:23515128

Lozano-Alvarez, Carlos; Alier, Albert; Pelfort, Xavier; Martínez-Díaz, Santos; Puig, Lluis

2013-03-19

301

SÍFILIS SIMULANDO HANSENÍASE BORDERLINE-TUBERCULÓIDE: INTERFACES QUANTO AO CONTEXTO HISTÓRICO, CLÍNICO E DE SAÚDE PUBLICA SYPHILIS MIMICKING BORDERLINE (BT) LEPROSY. HISTORICAL, CLINICAL AND PUBLIC HEALTH INTERFACES  

Microsoft Academic Search

We present a case of a 37 year-old woman, who was born and lived in Manaus, Brazil. She sought medical attention because of skin lesions - erythe- matous plaques of different sizes, localized to chest, face and lower limbs. A biopsy was performed and the hematoxylin and eosin staining has showed a granulomatous infiltrate around blood vessels, appendages and nerves.

Antonio PM Schettini; José CG Sardinha; Renato CS Júnior; Maria CA Schettini; Nádya FP Lopes

302

Desequilibrio no Mercado do Credito e Politica Economica: Uma Aplicacao ao Caso Portugues (Disequilibrium in the Bank Credit Market and Policy: An Application to the Portuguese Credit Market).  

National Technical Information Service (NTIS)

The author considers the standard disequilibrium model of three goods (labor, output and money) and two markets (labor and output) in which he introduces the bank credit market. The aim of the study is the examination and comparison of the effects of diff...

A. L. Silvestre

1989-01-01

303

First Light LBT AO Images of HR 8799 bcde at 1.6 and 3.3 ?m: New Discrepancies between Young Planets and Old Brown Dwarfs  

NASA Astrophysics Data System (ADS)

As the only directly imaged multiple planet system, HR 8799 provides a unique opportunity to study the physical properties of several planets in parallel. In this paper, we image all four of the HR 8799 planets at H band and 3.3 ?m with the new Large Binocular Telescope adaptive optics system, PISCES, and LBTI/LMIRCam. Our images offer an unprecedented view of the system, allowing us to obtain H and 3.3 ?m photometry of the innermost planet (for the first time) and put strong upper limits on the presence of a hypothetical fifth companion. We find that all four planets are unexpectedly bright at 3.3 ?m compared to the equilibrium chemistry models used for field brown dwarfs, which predict that planets should be faint at 3.3 ?m due to CH4 opacity. We attempt to model the planets with thick-cloudy, non-equilibrium chemistry atmospheres but find that removing CH4 to fit the 3.3 ?m photometry increases the predicted L' (3.8 ?m) flux enough that it is inconsistent with observations. In an effort to fit the spectral energy distribution of the HR 8799 planets, we construct mixtures of cloudy atmospheres, which are intended to represent planets covered by clouds of varying opacity. In this scenario, regions with low opacity look hot and bright, while regions with high opacity look faint, similar to the patchy cloud structures on Jupiter and L/T transition brown dwarfs. Our mixed-cloud models reproduce all of the available data, but self-consistent models are still necessary to demonstrate their viability. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are as follows: The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di AstroÞsica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota, and University of Virginia.

Skemer, Andrew J.; Hinz, Philip M.; Esposito, Simone; Burrows, Adam; Leisenring, Jarron; Skrutskie, Michael; Desidera, Silvano; Mesa, Dino; Arcidiacono, Carmelo; Mannucci, Filippo; Rodigas, Timothy J.; Close, Laird; McCarthy, Don; Kulesa, Craig; Agapito, Guido; Apai, Daniel; Argomedo, Javier; Bailey, Vanessa; Boutsia, Konstantina; Briguglio, Runa; Brusa, Guido; Busoni, Lorenzo; Claudi, Riccardo; Eisner, Joshua; Fini, Luca; Follette, Katherine B.; Garnavich, Peter; Gratton, Raffaele; Guerra, Juan Carlos; Hill, John M.; Hoffmann, William F.; Jones, Terry; Krejny, Megan; Males, Jared; Masciadri, Elena; Meyer, Michael R.; Miller, Douglas L.; Morzinski, Katie; Nelson, Matthew; Pinna, Enrico; Puglisi, Alfio; Quanz, Sascha P.; Quiros-Pacheco, Fernando; Riccardi, Armando; Stefanini, Paolo; Vaitheeswaran, Vidhya; Wilson, John C.; Xompero, Marco

2012-07-01

304

Photo-excitation of adenine cation radical [Ao+] in the near UV-vis region produces sugar radicals in Adenosine and in its nucleotides  

PubMed Central

In this study, we report the formation of ribose sugar radicals in high yields (85 – 100%) via photo-excitation of adenine cation radical (A•+) in Ado and its ribonucleotides. Photo-excitation of A•+ at low temperatures in homogenous aqueous glassy samples of Ado, 2?-AMP, 3?-AMP and 5?-AMP forms sugar radicals predominantly at C5?- and also at C3?-sites. The C5?• and C3?• sugar radicals were identified employing Ado deuterated at specific carbon sites: C1?, C2?, and at C5?. Phosphate substitution is found to deactivate sugar radical formation at the site of substitution. Thus, in 5?-AMP, C3?• is observed to be the main radical formed via photo-excitation at ca. 143 K whereas in 3?-AMP, C5?• is the only species found. These results were supported by results obtained employing 5?-AMP with specific deuteration at C5?-site (i.e., 5?,5?-D,D-5?-AMP). Moreover, contrary to the C5?• observed in 3?-dAMP, we find that C5?• in 3?-AMP shows a clear pH dependent conformational change as evidenced by a large increase in the C4? ?–hyperfine coupling on increasing the pH from 6 to 9. Calculations performed employing DFT (B3LYP/6-31G*) for C5?• in 3?-AMP show that the two conformations of C5?• result from strong hydrogen bond formation between the O5?-H and the 3?-phosphate dianion at higher pHs. Employing time-dependent density functional theory [TD-DFT, B3LYP/6-31G(d)] we show that in the excited state, the hole transfers to the sugar moiety and has significant hole localization at the C5?-site in a number of allowed transitions. This hole localization is proposed to lead to the formation of the neutral C5?-radical (C5?•) via deprotonation.

Adhikary, Amitava; Khanduri, Deepti; Kumar, Anil; Sevilla, Michael D.

2011-01-01

305

Avaliacao geoquimica das bacias marginais ao sul da Bahia, Brasil. (Geochemical evaluation of marginal basins in the south of Bahia state, Brazil).  

National Technical Information Service (NTIS)

Geochemical analyses were performed on more than 700 rock samples and 4 oil samples, from Mucuri, Cumuruxatiba and Jequitinhonha basins, offshore Bahia state, Brazil. The methods employed in this study includes the evaluation of organic carbon contents, R...

P. C. Gaglianone L. A. F. Trindade M. M. Nascimento

1987-01-01

306

ÁREA TEMÁTICA: Marketing e Comunicação Valor Percebido da Marca Nike Junto aos Públicos Pertencentes às Classes Sócio- Econômicas A e B de Porto Alegre  

Microsoft Academic Search

The subject brand equity is one of the thopics most studied in todays field administration. Its strategicly importancy and benefits to companies performance made great experts and thinkers releated to the area developted theories and applications of results. There are today two approaches that serve as north for the studies in this field: the determination of property value of the

DIEGO BECK VEIGA; LILIANE ANTUNES ROHDE

307

Les apports de l'experimentation assistee par ordinateur (ExAO) en pedagogie par projet en Sciences de la nature au collegial  

NASA Astrophysics Data System (ADS)

The goals of this research were to conceptualize and to produce a test synthesis model for the Sciences program, where the student had to demonstrate his or her competency using the approach Considering New Situations from Acquired Knowledge. The test took the form of a student-structured project utilizing the experimental process: the student's scientific investigation was supported and facilitated by computer-assisted experimentation (CAEx). The model of action was elaborated in developmental research within the school setting, tested in biology, and continued in an interdisciplinary context. Our study focused on the advantages and the constraints of this new learning environment, which modify laboratories using traditional instrumentation. The final research was not to evaluate a type of test synthesis, but to propose and to improve this model of test synthesis based on experimental process and supported by CAEx. In order to implement the competency approach within an integration activity, we chose a cooperative learning environment contained within the pedagogical project. This didactic environment was inspired by socio-constructivism which involves students in open scientific problem-solving. Computer-assisted experimentation turned out to be a valuable tool for this environment, facilitating the implementation of the scientific process by increased induction. Resistance to confronted and uncircumvented reality changes students' perception of scientific knowledge. They learn to integrate the building of this knowledge, and then to realize the extent of their learning and their training. Students' opinions, which were gathered from questionnaires, reveal that they favorably perceive this type of environment in interaction with their peers and the experimentation. While this new knowledge contributes to CAEx within the pedagogical project, the products of this research included a teaching guide for the test synthesis, a booklet featuring the projects carried out by the students with CAEx, and the proposals to renew the didactic approach in the laboratory.

Marcotte, Alice

308

Distribuicao da scheelita ao longo da faixa anfibolitica do greenstone belt, Barbacena, MG. (Scheelite distribution a long of amphibolitic belt from greenstone belt Barbacena, Minas Gerais, Brazil).  

National Technical Information Service (NTIS)

In the middle southern portion of the Minas Gerais state a 60 Km long and 12 Km wide tungsten belt was discovered, and related to the amphibolitic rocks of the Barbacena Greenstone. Tungsten, present as scheelite, is associated with amphibolites, amphibol...

R. M. Pereira C. A. Alexandre

1990-01-01

309

Ansiedade na gestação, prematuridade e baixo peso ao nascer: uma revisão sistemática da literatura Anxiety during pregnancy, prematurity, and low birth weight: a systematic literature review  

Microsoft Academic Search

The purpose of this systematic literature review was to examine publications that had investi- gated the effect of anxiety on prematurity and\\/or low birth weight. The PubMed, BVS, CINAHL, and HEALTHSTAR databases, published from 1966 to 2006, were tracked using the following

Daniele Marano; Rocha Araújo; Natália de Lima Pereira; Gilberto Kac

310

Otimizacao de Parametros Referentes AO Comportamento Dinamico de Paineis So Lares (Optimization of the Reference Parameters in the Accompanying Solar Panel Dynamics).  

National Technical Information Service (NTIS)

A procedure is presented for mass minimization of solar panels used in artificial satellite, considering mechanical strength and first mode vibration frequency constraints. These constraints are used in order to avoid undesirable effects of the solar pane...

C. Deassisfleury J. A. Penteadoaranha A. Riosneto

1989-01-01

311

Problemas comportamentais e stress em crianças com ansiedade frente ao tratamento odontológico1 Children's behavioral problems and stress as a consequence of dental treatment anxiety  

Microsoft Academic Search

Anxiety and stress are usually related to the dental treatment situation; and pain, physiological and psycological treatment issues may be evaluated specially by children patients, as they are considered well-being potential threats. The comparison between children's stress and behavioral profile of a children's group with high level of anxiety during dental treatment (G1) to a group of children, who cooperate

Cármen Lúcia CARDOSO; Sonia Regina LOUREIRO

312

Análise clínica, radiológica, macroscópica e histológica do úmero de codornas domésticas (Coturnix japonica), submetido ao implante da poliuretana derivada do polímero de mamona (Ricinnus communis)  

Microsoft Academic Search

In orthopedic surgery there are frequently situations in which the surgeon faces severe bone losses caused by high- energy trauma, tumors or infections. Repairing these losses require knowledge about filling materials. Those materials can be biological, synthetic or metallic, with emphasis in bony grafts and biomaterial implants. The increase of the use of birds as pets is leading to an

Juliano Bolson; João Eduardo Schossler; Roberta Caroline Ornes; Vanessa Mottin; Thiago Alberti

2005-01-01

313

Response of osteoblastic cells to titanium submitted to three different surface treatments Resposta de células osteoblásticas ao titânio submetido a três diferentes tratamentos de superfície  

Microsoft Academic Search

In the complex process of bone formation at the implant-tissue interface, surface properties are rel- evant factors modulating osteoblastic function. In this study, commercially pure titanium (cp Ti) samples were prepared with different surface characteristics using chemical attack with a sulfuric acid\\/hydrochloric acid based solution (treatment A); chemical attack plus anodic oxidation using phosphoric acid (treatment B); and chemical attack

Adriana Soares Santiago; Euler Araújo dos Santos; Márcia Soares Sader; Marcelo Felippe Santiago; Gloria de Almeida Soares

314

Monitoring microbial community structure and succession of an A/O SBR during start-up period using PCR-DGGE.  

PubMed

Polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE) protocol was employed for revealing microbial community structure and succession in a sequential anaerobic and aerobic reactor performing enhanced biological phosphorus removal (EBPR) during start-up period. High phosphorus removal was achieved after 15 d. On day 30, phosphorus removal efficiency reached to 83.2% and the start-up was finished. DGGE profiles of periodical sludge samples showed that dominant microbial species were 19 OTUs (operational taxonomy units). Unweighted pair-group method using arithmetic averages (UPGMA) clustering analysis revealed that rapid community succession correlated to low phosphorus removal rate and high phosphorus removal efficiency reflected on steady community structure. Sequencing results indicated that determined sequences (12 OTUs) belonged to Proteobacterium, Actinobacteria, Gemmatimonadales and unaffiliate group. Proteobacterium, Tetrasphaera elongate and Gemmatimonas aurantiaca may act important roles in phosphorus removal. With little amount as known glycogen accumulating organisms, Candidatus Competibacter phosphatis still at accumulating-phase had limited effect on microbial community structure. When climax community was obtained, dominant microbes were 14 OTUs. Microbes in a large amount were uncultured bacterium Thauera sp., uncultured gamma-Proteobacterium and Tetrasphaera elongata. PMID:19402426

Wang, Xiuheng; Zhang, Kun; Ren, Nanqi; Li, Nan; Ren, Lijiao

2009-01-01

315

Monitoring microbial community structure and succession of an A\\/O SBR during start-up period using PCR-DGGE  

Microsoft Academic Search

Polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE) protocol was employed for revealing microbial community structure and succession in a sequential anaerobic and aerobic reactor performing enhanced biological phosphorus removal (EBPR) during start-up period. High phosphorus removal was achieved after 15 d. On day 30, phosphorus removal efficiency reached to 83.2% and the start-up was finished. DGGE profiles of periodical

Xiuheng WANG; Kun ZHANG; Nanqi REN; Nan LI; Lijiao REN

2009-01-01

316

Mapeamento da cobertura natural e uso da terra como subsidio ao estudo da dinâmica e ocupação do Estado do Tocantins entre 1990 e 2007  

Microsoft Academic Search

In the Amazon Region large areas of savannas and forests have been changing in pasture and agriculture that modify the environment resulting in environmental and economic problems. The Tocantins state has climatics and physicals features common with Amazon and the Brazil Central Region and it is a transiction zone. On the purpose of study the dynamic of coverage and land

Marco Aurélio Barros

317

DEPENDÊNCIA AO EXERCÍCIO FÍSICO E A SÍNDROME DO EXCESSO DE TREINAMENTO: CONSEQUÊNCIAS DO EXCESSO DE EXERCÍCIO PHYSICAL EXERCISE DEPENDECE AND THE OVERTRAINING SYNDROME: CONSEQUENCES OF EXCESSIVE EXERCISE  

Microsoft Academic Search

The practice of regular physical exercises can produce many beneficial health effects, but studies indicate that when exercises are conducted on a compulsory basis, can result in pathological dependence. For some individuals, exercise can become an obsession causing dependence. The individuals diagnosed with exercise dependence are vulnerable to the framework of the overtraining syndrome (SET) which has symptoms such as

Altair Argentino; Pereira Júnior

318

Aplicação da técnica de remoção do contínuo para a discriminação espectral de diferentes dosagens de Nitrogênio aplicadas ao trigo ( Triticum aestivum, L. - IAC370)  

Microsoft Academic Search

The continuum removal method has been explored to evaluate the spectral characterization of winter wheat exposed to three different amount of nitrogen (N0, N120 and N120 Kg ha -1). The continuum removal consist in normalize absorption bands. Three absorption bands on visible and near infrared regions centered on 665, 983 and 1205 nm were studied in terms of band depth,

Fábio Marcelo Breunig

319

MEDIATEC - Mediação Tecnológica em Espaços Virtuais para Apoio ao Professor Online MEDIATEC: Aiding Online Teachers trough Tecnhological Mediation in Virtual Environments  

Microsoft Academic Search

Nowadays web learning environments are being widely used both in distance and non-distance learning activitites. This condition creates new demands for the teacher that now needs to follow the students learning process inside virtual environments. It is widely accepted that mediation is a fundamental part of any educational process. Good teachers perform skillful mediation techniques that generally ensure good and

Liliana M. Passerino; João Carlos Gluz; Rosa Maria Vicari

320

CONDIÇÕES DE TRABALHO ASSOCIADAS AO USO DE AGROTÓXICOS NA CULTURA DE TOMATE DE MESA EM GOIÁS Work conditions associated to the use of pesticides in the tomato crop in Goiás  

Microsoft Academic Search

In 2005, Goiás state was the greater tomato producer in Brazil. To improve the harvest and to keep the tomato disease under control, the tomato producer makes use of a technological packing kit with systematic application of many chemical substances. The major purpose of this thesis is to describe the daily conditions that the tomato plantation workers are subordinated in

Sueli Martins; Freitas Alves; Paulo Marçal Fernandes; Joel Orlando; Bevilaqua Marin

321

Epidemiology of co-sleeping and nighttime waking at 12 months in a birth cohort Epidemiologia do co-leito e do despertar noturno aos 12 meses de idade em uma coorte de nascimentos  

Microsoft Academic Search

Objective: To investigate the prevalence and factors associated with co-sleeping and nighttime waking among the children of the Pelotas 2004 cohort at 12 months of age. Methods: All children born in the city of Pelotas, RS, Brazil during 2004 were enrolled on a longitudinal study. Mothers were interviewed at delivery and once more at 12 months of age to obtain

Iná S. Santos; Denise M. Mota; Alicia Matijasevich

322

Precise Excision of IS5 from the Intergenic Region between the fucPIK and the fucAO Operons and Mutational Control of fucPIK Operon Expression in Escherichia coli ?  

PubMed Central

Excision of transposable genetic elements from host DNA occurs at low frequencies and is usually imprecise. A common insertion sequence element in Escherichia coli, IS5, has been shown to provide various benefits to its host by inserting into specific sites. Precise excision of this element had not previously been demonstrated. Using a unique system, the fucose (fuc) regulon, in which IS5 insertion and excision result in two distinct selectable phenotypes, we have demonstrated that IS5 can precisely excise from its insertion site, restoring the wild-type phenotype. In addition to precise excision, several “suppressor” insertion, deletion, and point mutations restore the wild-type Fuc+ phenotype to various degrees without IS5 excision. The possible bases for these observations are discussed.

Zhang, Zhongge; Yen, Ming Ren; Saier, Milton H.

2010-01-01

323

H XPH?H TOY ?IA?IKTYOY ?THN ?.E. A?O TOY? EK?AI?EYTIKOY? ?EYTEPOBA?MIA? EK?AI?EY?H? TOY NOMOY ?EYKA?A?  

Microsoft Academic Search

?EPI?H?H H ????? ??? ?????????? ???? ????????? ?????? ?? ????????? ?????? ??? ?? ??????????? ??? ???????, ????????????? ?? ??????? ??????? ??? ??? ???????????? ?????????. E????????? ? ?????????????? E????????? ????????? ????????? ????? ??? ???? ?????? ???????????? ???????????, ???????? ??? ???????????, ????????? ??????? ??? ??????? ?????. A?????? ???????? ??????????? ???????????? ???? ????????? ????. ?? ???? ?? ??????? ???? ??????????? ????????, ??? ???????????

2006-01-01

324

Um estudo das crenças no que concerne ao consumo\\/tráfico de drogas enquanto causa da violência\\/agressividade A study of the beliefs with respect to consumption\\/ traffic of drugs while cause of the violence\\/aggressiveness  

Microsoft Academic Search

This paper aims at investigating the beliefs about the relationship between drugs consumption\\/traffic and violence\\/aggression behavior, among individuals from two different urban environments: Juiz de Fora and Piau. The cause-and-effect l ink between drugs consumption\\/traffic and violence\\/aggression behavior was considered statistically corroborate, thereby confirm our presupposition on the existence of such belief, with peculiarities. Also was considered corroborate the presupposition

Lélio Moura Lourenço; Gabriel Resgala Silva; Thiago Pavin Rodrigues; Diego Pedrosa Carvalho

325

Constraining the Evolution of Brown Dwarf Binarity as a Function of Age: A Keck LGS AO Search for Brown Dwarf and Planetary Mass Companions to Upper Scorpius Brown Dwarfs  

NASA Astrophysics Data System (ADS)

We searched for binary companions to 20 brown dwarfs in Upper Scorpius (145 pc, 5 Myr, nearest OB association) with the facility infrared camera NIRC2 and the Laser Guide Star adaptive optics system on the 10 m Keck II telescope. We discovered a close companion (0.14?, 20.9±0.4 AU) to the very low mass object SCH J16091837-20073523. From spectral deconvolution of integrated-light near-IR spectroscopy of SCH1609 using the SpeX spectrograph (Rayner et al. 2003), we estimate primary and secondary spectral types of M6±0.5 and M7±1.0, corresponding to masses of 79±17 MJup and 55±25 MJup at an age of 5 Myr and masses of 84±15 MJup and 60±25 MJup at an age of 10 Myr. For our survey objects with spectral types later than M8, we find an upper limit on the binary fraction of <9% (1-?) at separations greater than 10 AU. We combine the results of our survey with previous surveys of Upper Sco and similar young regions to set the strongest constraints to date on binary fraction for young substellar objects and very low mass stars. The binary fraction for low mass (<40 MJup) brown dwarfs in Upper Sco is similar to that for T dwarfs in the field; for higher mass brown dwarfs and very low mass stars, there is an excess of medium-separation (10-50 AU projected separation) young binaries with respect to the field. These medium separation binaries will likely survive to late ages.

Biller, B.; Allers, K.; Liu, M.; Close, L. M.; Dupuy, T.

2011-12-01

326

FIRST LIGHT LBT AO IMAGES OF HR 8799 bcde AT 1.6 AND 3.3 {mu}m: NEW DISCREPANCIES BETWEEN YOUNG PLANETS AND OLD BROWN DWARFS  

SciTech Connect

As the only directly imaged multiple planet system, HR 8799 provides a unique opportunity to study the physical properties of several planets in parallel. In this paper, we image all four of the HR 8799 planets at H band and 3.3 {mu}m with the new Large Binocular Telescope adaptive optics system, PISCES, and LBTI/LMIRCam. Our images offer an unprecedented view of the system, allowing us to obtain H and 3.3 {mu}m photometry of the innermost planet (for the first time) and put strong upper limits on the presence of a hypothetical fifth companion. We find that all four planets are unexpectedly bright at 3.3 {mu}m compared to the equilibrium chemistry models used for field brown dwarfs, which predict that planets should be faint at 3.3 {mu}m due to CH{sub 4} opacity. We attempt to model the planets with thick-cloudy, non-equilibrium chemistry atmospheres but find that removing CH{sub 4} to fit the 3.3 {mu}m photometry increases the predicted L' (3.8 {mu}m) flux enough that it is inconsistent with observations. In an effort to fit the spectral energy distribution of the HR 8799 planets, we construct mixtures of cloudy atmospheres, which are intended to represent planets covered by clouds of varying opacity. In this scenario, regions with low opacity look hot and bright, while regions with high opacity look faint, similar to the patchy cloud structures on Jupiter and L/T transition brown dwarfs. Our mixed-cloud models reproduce all of the available data, but self-consistent models are still necessary to demonstrate their viability.

Skemer, Andrew J.; Hinz, Philip M.; Rodigas, Timothy J.; Close, Laird; McCarthy, Don; Kulesa, Craig; Apai, Daniel; Bailey, Vanessa [Steward Observatory, Department of Astronomy, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721 (United States); Esposito, Simone; Arcidiacono, Carmelo; Mannucci, Filippo; Agapito, Guido; Argomedo, Javier; Briguglio, Runa [Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Arcetri, Largo E Fermi 5, 50125 Firenze (Italy); Burrows, Adam [Department of Astronomy, Princeton University, 4 Ivy Lane, Princeton, NJ 08544 (United States); Leisenring, Jarron [Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich (Switzerland); Skrutskie, Michael [Department of Astronomy, University of Virginia, 530 McCormick Road, Charlottesville, VA 22904 (United States); Desidera, Silvano; Mesa, Dino [Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, Vicolo dell' Osservatorio 5, I-35122 Padova (Italy); Boutsia, Konstantina [Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721 (United States); and others

2012-07-01

327

EM?EIPIE? A?O THN ?EITOYP?IA TOY AYTOMATOY TH?EMETPIKOY METE?PO?O?IKOY ?TA?MOY ?TO E?NIKO MET?OBIO ?O?YTEXNEIO  

Microsoft Academic Search

?. K????????????, N. M?????? ??? A. X?????????? T????? Y??????? ?????, Y????????? ??? ????????? ????? E????? M??????? ???????????, H?. ???????????? 5, A???? ?EPI?H?H ??? ???? ??? ????????????????? Z??????? ????????????? ???? ????????? ????????? ???????????? ?????????????? ???????, ? ?????????? ??? ?????? ?????????? ??? ??? ???????. ??? ?????? ???? ???????????? ?? ???? ???????? ????? ??????????, ???? ??? ???????? ????????, ??????????? ??? ????????? ????????? ???

D. Koutsoyiannis; N. Mamassis; A. Christofides

328

The C-terminal aO helix of human Ogg1 is essential for 8-oxoguanine DNA glycosylase activity: the mitochondrial b-Ogg1 lacks this domain and does not have glycosylase activity  

Microsoft Academic Search

The human Ogg1 glycosylase is responsible for repairing 8-oxo-7,8-dihydroguanine (8-oxoG) in both nuclear and mitochondrial DNA. Two distinct Ogg1 isoforms are present; a-Ogg1, which mainly localizes to the nucleus and b-Ogg1, which localizes only to mitochondria. We recently showed that mitochondria from r0 cells, which lack mitochondrial DNA, have similar 8-oxoG DNA glycosylase activity to that of wild-type cells. Here,

K. Hashiguchi; J. A. Stuart; N. C. de Souza-Pinto; V. A. Bohr

329

Nursing actions to prevent urinary tract infection associated with long-standing bladder catheter Ações de enfermagem para prevenção de infecção do trato urinário relacionada ao cateter vesical de demora  

Microsoft Academic Search

During hospital stay at the Intensive Care Unit (ICU), many treatments and procedures can breakdown the body defense mechanisms leading to infections. Urinary tract infections are the most frequent. This study was carried out in order to emphasize the standardization of nurse care, with the aim of reducing the ICU patient risk of developing urinary tract infections associated with indwelling

Fabrícia Alves Vieira

330

ADE Ada Compiler Version 5.234, Eclipse MV/10000, MV/4000, MV/6000, MV/8000C, MV/8000II, Rolm MSE/800 Using AOS/VS 3.12.  

National Technical Information Service (NTIS)

The purpose of this report is to document the results of testing performed on the Ada compiler, and in particular, to: 1) identify any language constructs supported by the compiler that do not conform to the Ada standard; 2) identify any unsupported langu...

1984-01-01

331

Programa ACHEI: Atenção ao Chagásico com Educação Integral no Município de Maringá e Região Noroeste do Paraná, Brasil The ACHEI Program: Chagas' Disease Awareness through Comprehensive Education in the Municipality of Maringá, Northwest Paraná, Brasil  

Microsoft Academic Search

This study analyzes 131 chagasic patients from different endemic areas that came to the Chagas' disease laboratory at the Maringa State University. The subjects discovered they were infected principally because they presented symptoms (58%) or donated blood (29.4%). During etiologic treatment for Trypanosoma cruzi, 45.2% of benznidazole users complained of side effects. Based on these data, the ACHEI p rogram

Silvana Marques de Araújo; Míriam Hitomi Andó; Dirceu José Cassarotti; Silvana Maria Ribeiro Borges; Mônica Lúcia Gomes

2000-01-01

332

Contribuicao ao estudo dos mecanismos de reparacao em Staphylococcus epidermidis: caracterizacao de mutantes sensiveis as radiacoes ultravioleta. (Contribution to the safety of repairing mechanisms in Staphylococcus epidermidis: characterization of mutants sensible to ultraviolet radiation).  

National Technical Information Service (NTIS)

Mutants obtained from N - methyl -N' - nitro - N - nitrosoguanidine (MNNG) treatment of the W(sub 5) strain or Staphylococcus epidermidis and selected for their increased UV - sensitivity were characterized according to their capacity to repair DNA damage...

H. C. Rocha Guillobel

1985-01-01

333

HIPERTENSÃO OCULAR E OPACIDADES CRISTALINIANAS SUBCAPSULARES ASSOCIADA AO TRATAMENTO DO ESTADO REACIONAL HANSÊNICO COM CORTICOTERAPIA ORAL Ocular hypertension and cataract related to the treatment of the reactional states in Hansen's disease with oral prednisone  

Microsoft Academic Search

RESUMO O objetivo deste trabalho foi determinar a freqüência de hipertensão ocular e de catarata em portadores de hanseníase em tratamento de estado reacional dos tipos I e II, associado ou não à neurite, com corticoterapia oral. A partir daí, selecionar, orientar e encaminhar os pacientes que apresentaram complicações oculares para propedêutica e tratamento oftalmológico adequados. Foi elaborado estudo descritivo

Monica Jeha Maakaroun; N. B. Vilela de Castro; Arthur Jeha; Maakaroun Vilela de Castro

334

Contribuicao ao estudo da fusao a arco sob atmosfera de gas inerte da esponja de zirconio. (Contribution to the study of arc melting in inert gas atmospheres of zirconium sponge).  

National Technical Information Service (NTIS)

Metallic zirconium is a material of great interest in the nuclear industry due to its low thermal neutron cross section, high strength and corrosion resistance. The latter permits its use in the chemical industry. In this study, a critical bibliographic r...

O. Julio Junior

1990-01-01

335

Efeitos da radiacao ionizante na crotoxina (toxina do veneno de Crotalus durissus terrificus): estudos ao nivel molecular. (Effects of ionizing radiation on crotoxin (toxin of Crotalus durissus terrificus venom): molecular studies).  

National Technical Information Service (NTIS)

It is know that the ionizing radiation is able to change significantly the biological and antigenic response of a toxin depending of the dose and irradiation's conditions, probable by structural alterations caused by radiation. In this work, the crotoxin,...

J. N. Souza Filho

1988-01-01

336

O Efeito do Tape Patelar ao Nível da Diminuição da Dor e da Actividade Muscular do Vasto Interno Obliquo e do Vasto Externo em Sujeitos com SÌndrome Patelo-Femural - Revisão Sistemática  

Microsoft Academic Search

Introduction: Patellofemoral Pain Syndromes (PFPS) are a clinical condition characterized by the presence of pain and changes of muscle activity between the VIO and VE. It is widely recognized that the patellar taping is one of the most used and accepted intervention strategies for patients with PFPS. However, the results on pain and muscular activity not appear to be consensual

Marco Jardim

337

Manganese Cycles as a Stratigraphic Tool in the Arctic Ocean: Reevaluation of Core AO96/12- 1PC Using the new Itrax XRF Core Scanner at Stockholm University  

NASA Astrophysics Data System (ADS)

Cyclical variation in the manganese content in key core 96/12-1PC taken during the Arctic Ocean-96 cruise on the Lomonosov Ridge have been interpreted to represent climatically controlled changes in the input of manganese from the Siberian hinterland and/or variations in the intermediate and deep water ventilation of the Arctic basins. It was therefore suggested that these manganese cycles represent warm phases that correlate to marine oxygen isotope stages and, thus, could be used for chronostratigraphic correlation between cores from the central Arctic Ocean where traditional isotope stratigraphy is difficult or impossible to establish due to the lack of calcareous microfossils. Analysis performed on 96/12-1PC using the new Itrax XRF core scanner at Stockholm University confirms these manganese cycles, and first measurements on neighboring cores suggest that these cycles may be correlated over large distances. Moreover, the XRF results confirm the previously suggested strong correlation between sediment color and manganese content. These manganese cycles therefore likely can be used for a first order chronostratigraphic correlation on at least a regional scale in the central Arctic Ocean. However, our XRF results does not rule out that local variations in cycle thicknesses or occurrences well may occur. The hypothesis of that brown manganese rich sediment cycles represent warm phases that can be correlated to marine oxygen stages will be tested further on material to be obtained on the southernmost part of the Lomonosov Ridge during the LOMROG expedition in August-September 2007.

Lowemark, L. A.; Jakobsson, M.

2007-12-01

338

Adaptive optics requirements definition for TMT  

Microsoft Academic Search

The scientific return on adaptive optics on large telescopes has generated a new vocabulary of different adaptive optics (AO) modalities. Multiobject AO (MOAO), multiconjugate AO (MCAO), ground-layer AO (GLAO), and extreme contrast AO (ExAO) each require complex new extensions in functional requirements beyond the experience gained with systems operational on large telescopes today. Because of this potential for increased complexity,

Richard G. Dekany; Matthew C. Britton; Don T. Gavel; Brent L. Ellerbroek; Glen Herriot; Claire E. Max; Jean-Pierre Veran

2004-01-01

339

The relationship between accounting and spatial practices in the factory ? ? An earlier version of this paper was presented at the AOS Conference on Accounting, Time and Space held in Copenhagen, 4–6 September, 1997. We acknowledge the constructive comments made by participants at this Conference, and also by the two anonymous AOS reviewers. This paper was partially funded by a joint research action of the British Council and the Spanish Ministry of Education (HB97-0017). The first named author is grateful to the CICYT (Spain) research grant No. SEC 98-0282  

Microsoft Academic Search

During the eighteenth century, tobacco production in the Royal Tobacco Factory (RTF) of Spain moved from the San Pedro Factory located in downtown Seville to the purpose built New Factories outside the city walls. This paper examines the relationship between accounting practices and spatial practices in these two radically different factory premises. The paper explores how the intervention of detailed

Salvador Carmona; Mahmoud Ezzamel; Fernando Gutiérrez

2002-01-01

340

Medida de Calor Espec´ ifico e Lei de Resfriamento de Newton: Um Refinamento na An ´ alise dos Dados Experimentais (Measurement of Specific Heat and Newton's Law of Cooling: A Refinement in the Analysis of the Experimental Data)  

Microsoft Academic Search

opria func ¸ ˜ ao que descreve a lei de resfriamento aos dados possibilitou a comparac ¸ ˜ ao imediata dos parˆ ametros obtidos experimentalmente com aqueles previstos pela teoria, e ha uma grande concordancia entre eles. A aplicac ¸ ˜ ao deste refinamento na determinac ¸ ˜ ao do calor espec´ ifico do alum´ inio indica que tal procedi-

Wilton Pereira da Silva; W. Precker

2003-01-01

341

Resistência adesiva à dentina: influência da aplicação dos laseRs de eR:YaG e nd:YaG associada ao condicionamento ácido Dentin Bon D Strenght: er:YA g AnD nD:YAg Applic Ation influence ASSoci Ate D to etching  

Microsoft Academic Search

Introduction: Adhesive procedures have intensely been developed, offering high values of adhesive strength to dental composites. However, other technologies, as the lasers, have been showing effectiveness in the preparation and\\/or modification of the dental surface, previously to the application of adhesive systems. The purpose of this study is to evaluate the influence of dentin treatment with Er:YAG and Nd:YAG la

Ballet de Cara Araújo; Karen Cristina; Kazue Yui; Márcia Maciel Menezes; Diego Klee de Vasconcelos; Sérgio Eduardo de; Paiva Gonçalves; Carlos Rocha Gomes Torres

342

Respostas de Freqüência Cardíaca, Consumo de Oxigênio e Sensação Subjetiva ao Esforço em um Exercício de Hidroginástica Executado por Mulheres em Diferentes Situações Com e Sem o Equipamento Aquafins ? Heart Rate, Oxygen Consumption and Rating of Perceived Exertion Responses in a Water Aerobic Exercise Performed by Women at Different Situations with and without the Aquafins Apparatus  

Microsoft Academic Search

Aquatic exercise sessions are becoming increasingly diversified due to the use of apparatus appropriate to aquatic environment. However, few studies analyzed the influence of the use of such apparatus in the car- diorespiratory responses. The purpose was to analyze the heart rate, oxygen consumption and the rating of perceived exertion of effort in women during an aquatic exercise performed in

Stephanie Santana Pinto; Cristine Lima Alberton; Paulo André; Luiz Fernando Martins Kruel; Porto Alegre

343

Poluicao ambiental: aspectos gerais e comparativos da solucao dada pela Florida Power and Light e ELETROPAULO, ao oleo vazado dos transformadores. (Environmental pollution: general and comparative aspects from the solution gave by Florida Power and Light and ELETROPAULO, to the spill oil from the transformer).  

National Technical Information Service (NTIS)

The politics for the environmental protection from ELETROPAULO Electric Company was described, making a parallel between what is been purposed by Florida Power and Light, joined to the American environment control institutes and what has been done by ELET...

P. L. Fraccari

1991-01-01

344

EFEITO DE DIFERENTES COMBINAÇÕES HORMONAIS SOBRE A TAXA DE RETORNO AO ESTRO E PRENHEZ EM VACAS DE CORTE LACTANDO, SUBMETIDAS À INSEMINAÇÃO ARTIFICIAL EM TEMPO FIXO. EFFECT OF DIFFERENT HORMONAL COMBINATIONS ON RETURN TO ESTRUS AND PREGNANCY RATES IN LACTATING BEEF COWS, SUBJECTED TO A FIXED TIME INSEMINATION  

Microsoft Academic Search

The objective of this study was to evaluate the effect of the Gonadotropin Releasing Hormone (GnRH) and of the Equine Chorionic Gonadotropin (eCG) and their association on conception and pregnancy rates in lactating beef cows, subjected to fixed-time artificial insemination (FTAI). In this study, 223 crossbred cows, with 65.9% presenting body condition scores < 3, were used.The treatment 1 (TC

Eduardo Schmitt; Elias Moura Luz; Ivan Bianchi; Eduardo Bunselmeyer; Ferreira Filho; Marcio Nunes Corrêa; Thomaz Lucia; João Carlos Deschamps

2007-01-01

345

TECNOLOGIA DO CUIDADO AO PACIENTE RENAL CRÔNICO: ENFOQUE EDUCATIVO-TERAPÊUTICO A PARTIR DAS NECESSIDADES DOS SUJEITOS CARE TECNOLOGY FOR THE CHRONIC RENAL DISEASE PATIENT: EDUCATIONAL THERAPEUTIC FOCUS FROM THE SUBJECT'S NEEDS TECNOLOGÍA DEL CUIDADO AL PACIENTE RENAL CRÓNICO: ENFOQUE EDUCATIVO- TERAPEUTICO A PARTIR DE LAS NECESIDADES DE LOS SUJETOS  

Microsoft Academic Search

The lack in services of hemodialysis which use an educational-therapeutic focus, built from subject participation, alerted us to develop this study. The objectives of this research were to identify learning situations that serve as a basis for practicing health education; to describe the stages of an educational instrument that facilitates health education based on the needs of chronic renal disease

Maria Veraci Oliveira Queiroz; Maria Catarina de Queiroz Dantas; Islane Costa Ramos; Maria Salete Bessa Jorge

346

Da mãe África aos filhos Brasil: expressão da herança genética para a anemia falciforme em estudantes do curso de farmácia da Universidade Federal do Piauí The mother africa children Brazil: expression of genetic inheritance for sickle cell anemia in students of pharmacy at the Federal University of Piauí  

Microsoft Academic Search

SUMMARY - Hereditary illness of bigger prevalence in the world and Brazil, the sickle cell already is considered a problem of public health. Characterized for homozigose of the gene of the sickle hemoglobin, it causes a gamma of signals and symptoms that demands integral attention to the patient. The sickle trace is characterized by heterozigose of the gene of the

Leonardo Ferreira Soares; Bernardo Melo Neto; Rafael Pires Veloso

2009-01-01

347

COMUNICAÇÃO SELEÇÃO P ARA ALTO TEOR DE ACILAÇÚCARES EM GENÓTIPOS DE TOMATEIRO E SUA RELAÇÃO COM A RESISTÊNCIA AO ÁCARO VERMELHO (Tetranychus evansi) E À TRAÇA (Tuta absoluta) Selection towards high acylsugar levels in tomato genotypes and its relationship with resistance to spider mite (Tetranychus evansi) and to the South American pinworm (Tuta absoluta)  

Microsoft Academic Search

Selection for high foliar levels of allelochemicals has been proposed as a suitable strategy for breeding tomatoes for arthropod pest resistance. In the Lycopersicon pennellii (Correll) D Arcy accession LA-716, acylsugars exsudated by type IV glandular trichomes present in all aerial parts of the plant reportedly mediate resistance to arthropod pests. This paper intended to study the levels of resistance

Guilherme Victor; Nippes Pereira; Wilson Roberto Maluf; Luciano Donizete Gonçalves; Luís Antônio; Augusto Gomes; Vicente Licursi

348

COMUNICAÇÃO VARIABILIDADE EM DEZ POPULAÇÕES DE Hemileia vastatrix EM RELAÇÃO À GERMINAÇÃO E AO COMPRIMENT O DO TUBO GERMINA TIVO EM QUA TRO TEMPERA TURAS Variability in ten populations of Hemileia vastatrix for germination and germinative tube length under four temperatures  

Microsoft Academic Search

The objective of this work was to verify the effect of temperature in germination and germ tube length in different populations of H. vastatrix (PHVs) temperatures. A bioassay was performed with ten PHVs, using an urediniospore suspension of at 0.5mg\\/mL in aqueous solution (0.05%) of tween 80. Two drops of each suspension was deposited on a microscope coverslip, covered with

Maria Eloisa Salustiano; Edson Ampélio Pozza; Antônio Carlos; Ferraz Filho; Alex Oliveira Botelho; Eduardo Alves

349

Modelo granular, percolacao-resistividade, RSE e modulo de elasticidade de materiais carbonosos: aplicacao ao endocarpo de babacu tratado termicamente ate 2.200(sup 0)C. (Granular model, percolation-resistivity, ESR and elastic modulus of carbonaceous materials application to the babassu endocarp heat treated up to 2200(sup 0)C).  

National Technical Information Service (NTIS)

A microscopic model (granular model) is presented to study heat treated carbons. A granular structure is defined in the carbon matrix, composed of turbostratic graphite-like microcrystallites, cross-linkings and micropores. A general expression is develop...

F. G. Emmerich

1987-01-01

350

Contribuicao ao estudo da radiosensibilidade do tumor de Walker 256 em ratos. Associacao da imunizacao previa com a acao da radiacao ionizante. (Contribution of radiosensitivity study for Walker 256 tumor in rats. Association of early immunization with action of ionizing radiation).  

National Technical Information Service (NTIS)

The suspension of tumoral cells from Walker 256 were irradiated with doses of 2.500, 4.500, 5.000, 5.500 and 7.500 rad for determining the attenuation dose. The suspension of inactives tumoral cells were injected in rats for verifying the immunized effect...

A. T. Y. Sakate

1979-01-01

351

Comparação entre duas dietas à base de leite humano em relação ao crescimento e à mineralização óssea de recém-nascidos de muito baixo peso Comparison of two diets with modified human milk regarding growth and bone mineralization of very low birth weight infants  

Microsoft Academic Search

Objective: To compare the efficacy and tolerability of two diets based on human milk (HM) added with PreNan® or FM 85® on physical growth, bone mineralization and duration of hospitalization. Methods: Two groups of very low birth weight (VLBW) infants were studied: Group A, 14 infants fed with HM+FM 85® (5g\\/100mL HM) and Group B, 11 infants fed with HM+PreNan®

Ana Beatriz Gonçalves; Salim Moisés Jorge; Arthur Lopes Gonçalves

352

Characteristics and purification of an oxygen insensitive azoreductase from Caulobacter subvibrioides strain C7-D  

Microsoft Academic Search

  An azo dye-degrading bacterium, Caulobacter subvibrioides strain C7-D, semi-constitutively produces an azoreductase that reduced the azo bond of the dyes Acid Orange (AO) 6, AO7,\\u000a AO8, AO12, Acid Red (AR) 88, AR151, and Methyl Red (MR). This activity was oxygen insensitive. Of the dyes tested, AO7 was\\u000a the best inducer and the most rapidly reduced substrate suggesting that dye AO7

R Mazumder; J R Logan; A T Mikell Jr; S W Hooper

1999-01-01

353

ASPECTOS NUTRICIONAIS E TOXICOLÓGICOS DAS DROGAS VETERINARIAS USADAS COMO PROMOTORAS DO CRESCIMENTO ANIMAL NO ÜLTIMO DECENIO. PERSPECTIVAS FUTURAS  

Microsoft Academic Search

Referência aos principais grupos de compostos farmacologicamente activos usados como promotores do crescimento dos animais destinados ao consumo humano. São referidas as incertezas quanto à sua segurança, as pressões do consumidor, as decisões políticas e as resultantes restrições legislativas no que respeita ao seu uso. O recurso aos agonistas ß-adrenérgicos na última década, a controvérsia das suas acções no organismo

M. Lourdes A. S. Bastos; Margarida A. Ferreira

1996-01-01

354

Inhibition of Wound-Induced Accumulation of Allene Oxide Synthase Transcripts in Flax Leaves by Aspirin and Salicylic Acid1  

Microsoft Academic Search

Allene oxide synthase (AOS) mediates the conversion of lipoxygenase-derived fatty acid hydroperoxides to unstable allene epoxides, which supply the precursors for the synthesis of the phytohormone jasmonic acid (JA). In this study the characterization of AOS gene expression in flax (Linum usitatissimum) is reported. AOS was constitutively expressed in different organs of flax plants. Additionally, AOS gene expression was enhanced

Karsten Harms; Ingrid Ramirez; Hugo Pena-Cortes

1998-01-01

355

Reflective afocal adaptive optics: optical coherence tomography retinal imaging system  

NASA Astrophysics Data System (ADS)

We present a new design for a reflective afocal AO-OCT retinal imaging system. The optical performance of this instrument is compared to our previous multimodal AO-OCT/AO-SLO retinal imaging system. The feasibility of new instrumentation for improved visualization of microscopic retinal structures will be discussed. Examples of images acquired with this new AO-OCT instrument will be presented.

Lee, Sang Hyuck; Werner, John S.; Zawadzki, Robert J.

2013-03-01

356

Effects of molecule aggregation state on dynamic mechanical properties of chlorinated polyethylene\\/hindered phenol blends  

Microsoft Academic Search

The thermal properties of tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxy phenyl) propionyloxy] methane (AO-60) and the dynamic mechanical properties of chlorinated polyethylene (CPE)\\/AO-60 hybrids were investigated. AO-60 is a crystalline material, but after heat-treatment AO-60 was found to possess two phases: a general amorphous phase and a highly ordered phase. A mixture of CPE and non-heat-treated AO-60 showed only one transition, whereas for a

Chifei Wu; Kazue Mori; Yoshio Otani; Norikazu Namiki; Hitoshi Emi

2001-01-01

357

Routing of Hansenula polymorpha Alcohol Oxidase: An Alternative Peroxisomal Protein-sorting Machinery  

Microsoft Academic Search

Import of Hansenula polymorpha alcohol oxidase (AO) into peroxisomes is dependent on the PTS1 receptor, HpPex5p. The PTS1 of AO (-LARF) is sufficient to direct reporter proteins to peroxisomes. To study AO sorting in more detail, strains producing mutant AO proteins were constructed. AO containing a mutation in the FAD binding fold was mislocalized to the cytosol. This indicates that

Katja Gunkel; Ralf van Dijk; Marten Veenhuis; Ida J. van der Klei

2004-01-01

358

Routing of Hansenula polymorpha Alcohol Oxidase: An Alternative Peroxisomal Protein-sorting Machinery  

PubMed Central

Import of Hansenula polymorpha alcohol oxidase (AO) into peroxisomes is dependent on the PTS1 receptor, HpPex5p. The PTS1 of AO (-LARF) is sufficient to direct reporter proteins to peroxisomes. To study AO sorting in more detail, strains producing mutant AO proteins were constructed. AO containing a mutation in the FAD binding fold was mislocalized to the cytosol. This indicates that the PTS1 of AO is not sufficient for import of AO. AO protein in which the PTS1 was destroyed (-LARA) was normally sorted to peroxisomes. Moreover, C-terminal deletions of up to 16 amino acids did not significantly affect AO import, indicating that the PTS1 was not necessary for targeting. Consistent with these observations we found that AO import occurred independent from the C-terminal TPR-domain of HpPex5p, known to bind PTS1 peptides. Synthesis of the N-terminal domain (amino acids 1-272) of HpPex5p in pex5 cells restored AO import, whereas other PTS1 proteins were mislocalized to the cytosol. These data indicate that AO is imported via a novel HpPex5p-dependent protein translocation pathway, which does not require the PTS1 of AO and the C-terminal TPR domains of HpPex5p, but involves FAD binding and the N-terminus of HpPex5p.

Gunkel, Katja; van Dijk, Ralf; Veenhuis, Marten; van der Klei, Ida J.

2004-01-01

359

Dim Object Detection and Characterization Through Multi-frame Imaging.  

National Technical Information Service (NTIS)

The researcher made a breakthrough in attempts to explain theoretically peculiar behavior of adaptive-optics (AO) speckle, and subsequently developed a theory applicable to all frequently-encountered types of speckle, with or without AO, occurring on smal...

S. Gladysz

2011-01-01

360

Present Status and Future Plans for International Announcement of Opportunity for Research of the Hayabusa Returned Particles  

NASA Astrophysics Data System (ADS)

The international AO committee for research of Hayabusa returned particles has finished the selection for the research proposals for the first international AO. The particles for selected proposals are about to be distributed.

Abe, M.; Yada, T.; Okada, T.; Uesugi, M.; Karouji, Y.; Ishibashi, Y.; Yakame, S.; Mukai, T.; Fujimura, A.; Fujimoto, M.

2012-09-01

361

Compact MEMS-based Adaptive Optics Optical Coherence Tomography for Clinical Use  

SciTech Connect

We describe a compact MEMS-based adaptive optics (AO) optical coherence tomography system with improved AO performance and ease of clinical use. A typical AO system consists of a Shack-Hartmann wavefront sensor and a deformable mirror that measures and corrects the ocular and system aberrations. Because of the limitation on the current deformable mirror technologies, the amount of real-time ocular-aberration compensation is restricted and small in the previous AO-OCT instruments. In this instrument, we proposed to add an optical apparatus to correct the spectacle aberrations of the patients such as myopia, hyperopia and astigmatism. This eliminated the tedious process of the trial lenses in clinical imaging. Different amount of spectacle aberration compensation was achieved by motorized stages and automated with the AO computer for ease of clinical use. In addition, the compact AO-OCT was optimized to have minimum system aberrations to reduce AO registration errors and improve AO performance.

Chen, D; Olivier, S; Jones, S; Zawadzki, R; Evans, J; Choi, S; Werner, J

2008-02-04

362

Thermally assisted all-optical helicity dependent magnetic switching in amorphous Fe(100-x)Tb(x) alloy films.  

PubMed

All-optical switching (AOS) in ferrimagnetic Fe(100-x)Tb(x) alloys is presented. AOS is witnessed below, above, and in samples without a magnetic compensation point. It is found that AOS is associated with laser heating up to the Curie temperature and intimately linked to a low remanent sample magnetization. Above a threshold magnetization of 220 emu/cc helicity dependent AOS is replaced by pure thermal demagnetization. PMID:23616209

Hassdenteufel, Alexander; Hebler, Birgit; Schubert, Christian; Liebig, Andreas; Teich, Martin; Helm, Manfred; Aeschlimann, Martin; Albrecht, Manfred; Bratschitsch, Rudolf

2013-04-25

363

New integrated acousto-optic matrix algebra processor architecture  

Microsoft Academic Search

A new integrated optic matrix algebra processor architecture that utilizes guided-wave multifrequency acoustooptic (AO) Bragg diffractions is proposed. The architecture is potentially capable of performing matrix-vector multiplications faster than any AO architecture reported heretofore, and matrix-matrix multiplications at rates comparable to the fastest bulk-wave AO architecture. An integrated AO processor module has been realilzed in a Y-cut LiNbO3 substrate 1.0×10.0×28.0

A. Kar-Roy; C. S. Tsai

1991-01-01

364

Tomato Allene Oxide Synthase and Fatty Acid Hydroperoxide Lyase, Two Cytochrome P450s Involved in Oxylipin Metabolism, Are Targeted to Different Membranes of Chloroplast Envelope  

Microsoft Academic Search

Allene oxide synthase (AOS) and hydroperoxide lyase (HPL) are related cytochrome P450s that metabolize a common fatty acid hydroperoxide substrate to different classes of bioactive oxylipins within chloroplasts. Here, we report the use of in vitro import assays to investigate the targeting of tomato (Lycopersicon esculentum) AOS (LeAOS) and HPL (LeHPL) to isolated chloroplasts. LeAOS, which contains a typical N-terminal

John E. Froehlich; Ayah Itoh; Gregg A. Howe

2001-01-01

365

Cytochrome P450Dependent Metabolism of Oxylipins in Tomato. Cloning and Expression of Allene Oxide Synthase and Fatty Acid Hydroperoxide Lyase  

Microsoft Academic Search

Allene oxide synthase (AOS) and fatty acid hydroperoxide lyase (HPL) are plant-specific cytochrome P450s that commit fatty acid hydroperoxides to different branches of oxylipin metabolism. Here we report the cloning and characterization of AOS (LeAOS) and HPL (LeHPL) cDNAs from tomato (Lycopersicon esculentum). Functional expression of the cDNAs in Escherichia coli showed that LeAOS and LeHPL encode enzymes that metabolize

Gregg A. Howe; Gyu In Lee; Aya Itoh; Lei Li; Amy E. DeRocher

2000-01-01

366

Two primer pairs to detect OTA producers by PCR method  

Microsoft Academic Search

Fungi contaminating foods and feeds may produce many mycotoxins including ochratoxin A (OTA). Early and rapid detection of potential OTA producing fungi is important to reduce the negative impacts of OTA. In this study, two PCR specific primer pairs, AoLC35-12L\\/AoLC35-12R and AoOTAL\\/AoOTAR, were designed from a DNA sequence of a polyketide synthase gene in Aspergillus ochraceus NRRL 3174. On 14

Huy Phong Dao; Florence Mathieu; Ahmed Lebrihi

2005-01-01

367

Experimental results for correlation-based wavefront sensing  

SciTech Connect

Correlation wave-front sensing can improve Adaptive Optics (AO) system performance in two keys areas. For point-source-based AO systems, Correlation is more accurate, more robust to changing conditions and provides lower noise than a centroiding algorithm. Experimental results from the Lick AO system and the SSHCL laser AO system confirm this. For remote imaging, Correlation enables the use of extended objects for wave-front sensing. Results from short horizontal-path experiments will show algorithm properties and requirements.

Poyneer, L A; Palmer, D W; LaFortune, K N; Bauman, B

2005-07-01

368

Antisense Bcl–2 Oligonucleotide Uptake in Human Transitional Cell Carcinoma  

Microsoft Academic Search

Objectives: Antisense oligonucleotides (AO) downregulate Bcl–2 protein expression in various tumours if good target cell uptake is achieved. In this study, uptake of FITC labelled AO (FITC–AO) directed at Bcl–2 was examined in: (1) the RT4 bladder tumour cell line; (2) normal pig urothelium, and (3) human superficial bladder tumours.Methods: In the RT4 cell line, uptake of FITC–AO, FITC–scrambled and

Brian J. Duggan; Finbarr E. Cotter; John D. Kelly; Peter W. Hamilton; Kevin McCallion; Denis Harkin; Tom Gardiner; Neil Anderson; Patrick F. Keane; Samuel R. Johnston; Kate E. Williamson

2001-01-01

369

Os experimentos de Joule e a primeira lei da termodin^amica (Joule's experiments and the flrst law of thermodynamics)  

Microsoft Academic Search

A formula»c~ao do princ¶‡pio da conserva»c~ao da energiae um exemplo de longo amadurecimento, quase dois seculos e meio, de uma ideia que se tornou uma das leis basicas da f¶‡sica e cuja generaliza»c~ao foi alcan»cada ao ser formalizada como primeira lei da termodin^amica. No presente artigo, apresenta-se uma analise das diferentes formula»c~oes da primeira lei com o objetivo de resgatar

Julio Cesar Passos

370

Smoking cessation and severity of disease: the Coronary Artery Smoking Intervention Study  

Microsoft Academic Search

We tested the effectiveness of an individually delivered behavioral multicomponent smoking intervention (SI) against offering advice only (AO) to 267 patients after coronary arteriography. After 6 months, 51% of AO patients and 62% of SI patients reported abstinence. Validated rates were 34% and 45% for AO and SI patients, respectively. Logistic regression analyses, controlling for severity of illness, stage of

Judith K. Ockene; Jean L. Kristeller; Robert J. Goldberg; Ira S. Ockene; Philip A. Merriam; Susan V. Barrett; Penelope S. Pekow; David W. Hosmer; Ralph Gianelly

1992-01-01

371

Metaadaptive optics  

Microsoft Academic Search

The evolution of the adaptive optical systems (AOS) based on the use of spatial light modulators (SLMs) is outlined as well as their possible lines of future development. A conventional scheme of AOS consists of two basic units, the wavefront sensor and the wavefront compensator. Recently there appeared AOS relying on the use of only one SLM, which is then

R. Martinez-Cuenca; V. Duran; E. Tajahuerce; J. Lancis; V. Climent; J. Ares; J. Arines; P. Prado; S. Bara; Z. Jaroszewicz

2011-01-01

372

GRACE: a controlled environment for adaptive optics at the William Herschel Telescope  

Microsoft Academic Search

The William Herschel Telescope (WHT) has an adaptive optics (AO) suite consisting of the AO system NAOMI, near IR imager INGRID, optical field spectrograph OASIS and coronagraph OSCA. GRACE (GRound based Adaptive optics Controlled Environment) is a dedicated structure at a Nasmyth focus designed to facilitate routine AO use by providing a controlled environment for the instrument system. However, GRACE

Gordon Talbot; Don C. Abrams; Chris R. Benn; Alan Chopping; Kevin Dee; Sebastian Els; Martin Fisher; Stephen Goodsell; Doug Gray; Paul D. Jolley

2004-01-01

373

An Aspect Oriented Performance Analysis Environment  

Microsoft Academic Search

Abstract Performance analysis is motivated as an ideal domain for benefiting from the application of Aspect,Oriented,(AO),technology.,,,The experience of a ten week project to apply AO to the performance analysis domain is described. We show how all phases of a performance analysts’ activities ? initial profiling, problem identification, problem analysis and solution exploration ? were candidates for AO technology assistance ?

Jonathan Davies; Nick Huismans; Rory Slaney; Sian Whiting; Matthew Webster; Robert Berry

374

Influence of the annual Arctic Oscillation on the negative correlation between Okhotsk Sea ice and Amur River discharge  

Microsoft Academic Search

Newly obtained observational discharge data reveal the cause of a significant negative correlation between Amur River discharge and Okhotsk Sea ice at multiyear timescales. The annually integrated Arctic Oscillation (AO) influences both summer discharge and winter ice. Summer discharge is larger and winter ice is reduced during positive AO years. Annual AO also influences the annual horizontal moisture flux convergence

Masayo Ogi; Yoshihiro Tachibana

2006-01-01

375

The influence of the annual Arctic Oscillation on the negative correlation between Okhotsk sea ice and Amur River discharge  

Microsoft Academic Search

Newly obtained observational discharge data reveal the cause of a significant negative correlation between Amur River discharge and Okhotsk Sea ice at multiyear timescales. The annually integrated Arctic Oscillation (AO) influences both summer discharge and winter ice. Summer discharge is larger and winter ice is reduced during positive AO years. Annual AO also influences the annual horizontal moisture flux convergence

Masayo Ogi; Yoshihiro Tachibana; T. Yasunari

2006-01-01

376

The First Light of the Subaru Laser Guide Star Adaptive Optics System  

Microsoft Academic Search

Subaru Telescope has been operating 36 element curvature sensor AO system for the Cassegrain focus since 2000. We have developed a new AO system for the Nasmyth focus. The AO system has 188 element curvature wavefront sensor and bimorph deformable mirror. It is the largest format system for this type of sensor . The deformable mirror has also 188 element

Hideki Takami; Y. Hayano; S. Oya; M. Hattori; M. Watanabe; O. Guyon; M. Eldred; S. Colley; Y. Saito; M. Itoh; M. Dinkins

2007-01-01

377

Arctic Oscillation–induced variability in satellite-derived tropospheric ozone  

Microsoft Academic Search

The Arctic Oscillation (AO) has been identified as the dominant mode of near-surface climate variability in the Northern Hemisphere. In this study, we examine the interaction between the AO and the distribution of tropospheric ozone derived from satellite observations. Our analysis shows that there is a statistically significant correlation between the AO and the springtime tropospheric ozone distribution over the

John K. Creilson; Jack Fishman; Amy E. Wozniak

2005-01-01

378

Error Variability in Apraxia of Speech: A Matter of Controversy  

ERIC Educational Resources Information Center

|Purpose: Error variability has traditionally been considered a hallmark of apraxia of speech (AOS). However, in some of the current AOS literature, relatively invariable error patterns are claimed as a mandatory criterion for a diagnosis of AOS. This paradigm shift has far-reaching consequences for our understanding of the disorder and for its…

Staiger, Anja; Finger-Berg, Wolf; Aichert, Ingrid; Ziegler, Wolfram

2012-01-01

379

The Diagnosis and Understanding of Apraxia of Speech: Why Including Neurodegenerative Etiologies May Be Important  

ERIC Educational Resources Information Center

|Purpose: To discuss apraxia of speech (AOS) as it occurs in neurodegenerative disease (progressive AOS [PAOS]) and how its careful study may contribute to general concepts of AOS and help refine its diagnostic criteria. Method: The article summarizes our current understanding of the clinical features and neuroanatomical and pathologic correlates…

Duffy, Joseph R.; Josephs, Keith A.

2012-01-01

380

A conceptual design for the Thirty Meter Telescope adaptive optics systems  

Microsoft Academic Search

In this paper, we provide an overview of the adaptive optics (AO) program for the Thirty Meter Telescope (TMT) project, including an update on requirements; the philosophical approach to developing an overall AO system architecture; the recently completed conceptual designs for facility and instrument AO systems; anticipated first light capabilities and upgrade options; and the hardware, software, and controls interfaces

B. L. Ellerbroek; C. Boyer; C. Bradley; M. C. Britton; S. Browne; R. A. Buchroeder; J.-L. Carel; M. K. Cho; M. R. Chun; R. Clare; R. Conan; L. G. Daggert; R. G. Dekany; J. H. Elias; D. A. Erickson; R. Flicker; D. T. Gavel; L. Gilles; P. Hampton; G. Herriot; M. R. Hunten; R. R. Joyce; M. Liang; B. A. Macintosh; R. Palomo; I. P. Powell; S. C. Roberts; E. Ruch; J.-C. Sinquin; M. J. Smith; J. A. Stoesz; M. Troy; G. A. Tyler; J.-P. Veran; C. R. Vogel; Q. Yang

2006-01-01

381

Analyzing Class and Crosscutting Modularity with Design Structure Matrixes  

Microsoft Academic Search

Modularization of crosscutting concerns is the main benefit provided by Aspect-Oriented constructs. However, it does not address class modularity adequately. In order to assess both class and crosscutting modularity of AO systems, we use Design Structure Matrixes (DSMs) to analyze three different versions (OO, AO, and AO using design rules) of a real software application. We observed that, in the

Marcio De Medeiros Ribeiro; Marcos Dosea; Rodrigo Bonifacio; Alberto Costa Neto; Paulo Borba; Sérgio Soares

2007-01-01

382

78 FR 25666 - Airworthiness Directives; Airbus Airplanes  

Federal Register 2010, 2011, 2012, 2013

...procedures for addressing angle of attack (AoA) sensor blockage. The existing AD also provides for optional...the AFM revision, which involves replacing AoA sensor conic plates with AoA sensor flat plates. Since we issued that AD, we...

2013-05-02

383

78 FR 60667 - Airworthiness Directives; Airbus Airplanes  

Federal Register 2010, 2011, 2012, 2013

...procedures for addressing angle of attack (AoA) sensor blockage, and also provided for optional terminating...the AFM revision, which involves replacing AoA sensor conic plates with AoA sensor flat plates. This new AD requires replacing...

2013-10-02

384

Ground-based laboratory atomic oxygen calibration experiments  

Microsoft Academic Search

Existing devices and analysis techniques for the monitoring of space and laboratory simulated Atomic Oxygen (AO) environments have been investigated and improved to enable more accurate and reliable measurement and calibration of AO flux and fluences than previously possible. This research was based on experimental work carried out in a ground based AO facility designed to simulate the low Earth

Jeremy Stephen Matcham

1998-01-01

385

Lessons Learned from Adaptive Optics on Mauna Kea.  

National Technical Information Service (NTIS)

Mauna Kea (MK) is home to the largest collection of adaptive optics (AO) systems of any site in the world. We, the members of the MK Kamaaina AO group, thought that it would be useful to provide an overview of these AO systems, and the lessons learned wit...

2002-01-01

386

Novel Integrated Acoustooptic Frequency Shifters and Modules on Lithium Niobium Oxide for Fiber-Optic Systems and Optically-Activated Mach-Zehnder Interferometer on Gallium Arsenide  

Microsoft Academic Search

This dissertation presents the research leading to the development of a number of new integrated optical devices and a novel frequency modulation (FM) and self -heterodyne detection scheme for fiber-optic communication systems. A novel acoustooptic (AO) frequency shift scheme that utilizes double AO Bragg diffractions in cascade was proposed and implemented to eliminate the spatial variations of the AO frequency-shifted

Zhe Yuan Cheng

1991-01-01

387

Progressive Apraxia of Speech as a Sign of Motor Neuron Disease  

ERIC Educational Resources Information Center

|Purpose: To document and describe in detail the occurrence of apraxia of speech (AOS) in a group of individuals with a diagnosis of motor neuron disease (MND). Method: Seven individuals with MND and AOS were identified from among 80 patients with a variety of neurodegenerative diseases and AOS (J. R. Duffy, 2006). The history, presenting…

Duffy, Joseph R.; Peach, Richard K.; Strand, Edythe A.

2007-01-01

388

Removal of 2,4-D from Aqueous Solutions by Micellar Flocculation with ?-Olefinsulfonates  

Microsoft Academic Search

This paper describes the use of ?-olefinsulfonates (AOS) in the removal of the pesticide 2,4-dichlorophenoxyacetic acid from aqueous solutions by adsorptive micellar flocculation (AMF). The removal occurs by adsorption of the pollutant during flocculation of AOS micelles in the presence of Al. AOS is the second surfactant found to be susceptible to use in AMF.

M. PORRAS; F. I. TALENS

2000-01-01

389

Expression of ascorbate oxidase isoenzymes in cucurbits and during development and ripening of melon fruit  

Microsoft Academic Search

At least 14 ascorbate oxidase (AO) isoenzymes with isoelectric points in the range of pH 3–10 have been identified and their expression profile studied in various Cucurbitaceae tissues and during development and ripening of melon fruit (Cucumis melo L. var. reticulatus). At least four acidic AO isoenzymes were mainly located in the apoplastic fraction, whereas 10 basic AO isoenzymes were

Ashraf S. Al-Madhoun; Maite Sanmartin; Angelos K. Kanellis

2003-01-01

390

Melon ascorbate oxidase: cloning of a multigene family, induction during fruit development and repression by wounding  

Microsoft Academic Search

A small family of at least four genes encoding melon ascorbate oxidase (AO) has been identified and three members of it have been cloned. Preliminary DNA sequence determination suggested that melon AO genes code for enzymes homologous to ascorbate oxidases from other plants and similar to other multicopper oxidases. We describe detailed molecular studies addressing melon AO expression during organ

George Diallinas; Irene Pateraki; Maite Sanmartin; Angela Scossa; Eugenia Stilianou; Nickolas J. Panopoulos; Angelos K. Kanellis

1997-01-01

391

The Diagnosis and Understanding of Apraxia of Speech: Why Including Neurodegenerative Etiologies May Be Important  

ERIC Educational Resources Information Center

Purpose: To discuss apraxia of speech (AOS) as it occurs in neurodegenerative disease (progressive AOS [PAOS]) and how its careful study may contribute to general concepts of AOS and help refine its diagnostic criteria. Method: The article summarizes our current understanding of the clinical features and neuroanatomical and pathologic correlates…

Duffy, Joseph R.; Josephs, Keith A.

2012-01-01

392

In vivo inactivation of peroxisomal alcohol oxidase in Hansenula polymorpha by KCN is an irreversible process  

Microsoft Academic Search

The fate of alcohol oxidase (AO) in chemostatgrown cells of Hansenula polymorpha, after its inactivation by KCN, was studied during subsequent cultivation of the cyanide-treated cells in fresh methanol media. Biochemical experiments showed that the cyanide-induced inactivation of AO was due to the release of flavin adenine dinucleotide (FAD) from the holo enzyme. However, dissociation of octameric AO into subunits

Ida J. van der Klei; Marten Veenhuis; Klaas Nicolay; Wire Harder

1988-01-01

393

Adaptive Observation with Vehicle Dynamics  

NASA Astrophysics Data System (ADS)

Adaptive Observation (AO) studies mobile sensor deployment strategies to improve the estimation and forecast of various physical systems. Of the many approaches to the AO problem, few incorporate the dynamics of moving sensors into the trajectory planning algorithm. We propose a new AO algorithm which plans trajectories such that vehicle dynamics are inherently satisfied.

Zhang, David; Bewley, Thomas

2010-11-01

394

JOÃO GRILO, O DESMILINGÜIDO: A ESPERANÇA NO IMAGINÁRIO DO OPRIMIDO1 JOÃO GRILO, THE WEAKENED: THE HOPE IN THE IMAGINARY OF THE OPPRESSED  

Microsoft Academic Search

RESUMO: Objetiva-se neste estudo refletir sobre os sentidos que o mito de João Grilo - bastante difundido no sertão nordestino - assume no imaginário dos sujeitos\\/atores que, direta ou indiretamente, com ele se identificam, perpetuando-o ao longo dos tempos. Aos que detém o poder e\\/ou são abastados, o mito - ao denunciar seus vícios - representa uma ameaça, apontando para

André Adriano Brun

395

Metamorphism in Plate Boundary Zones  

Microsoft Academic Search

Accretionary orogenic systems (AOS) form at sites of subduction of oceanic lithosphere; these systems dominate during supercontinent break-up and dispersal. Collisional orogenic systems (COS) form where ocean basins close and subduction ultimately ceases; these systems dominate during crustal aggregation and assembly of supercontinents. It follows that COS may be superimposed on AOS, although AOS may exist for 100s Ma without

M. Brown

2005-01-01

396

Morphology of adhesive organ of the snow trout Schizothorax richardsonii (Gray, 1832)  

Microsoft Academic Search

This paper describes the morphology and fine structure of adhesive organ (AO) of the snow trout Schizothorax richardsonii (Gray, 1832). The species lives in the sub?Himalayan streams and rivers, where they adhere to submerged rocks and stones with its AO located beneath the mouth opening. The AO consists of a crescent callus part and a modified labial fold, bearing numerous

D. Das; T. C. Nag

2008-01-01

397

Age at onset in Huntington's disease: effect of line of inheritance and patient's sex  

Microsoft Academic Search

The Leiden Roster for Huntington's disease (HD) contained data on 2617 cases up to July 1988. The age at onset (AO) was known in 1084 cases and in 1020 of these both their AO and the sex of the affected parent was known. The mean AO was higher for females than for males and higher for maternal than for paternal

R A Roos; M Vegter-van der Vlis; J Hermans; H M Elshove; A C Moll; J J van de Kamp; G W Bruyn

1991-01-01

398

75 FR 42448 - Agency Information Collection Activities; Proposed Collection; Comment Request; Extension of...  

Federal Register 2010, 2011, 2012, 2013

...Form to the Financial Status Report for all AoA Title III Grantees AGENCY: Administration...Form to the Financial Status Report for all AoA Title III Grantees. DATES: Submit...form to the Financial Status Report for all AoA Title III Grantees provides an...

2010-07-21

399

Experimental verification of combinational-deformable-mirror for phase correction  

NASA Astrophysics Data System (ADS)

In adaptive optics (AO) system, the phase compensation capability is limited greatly by the actuator number of the deformable mirror (DM). The actuator number of DM is mainly restricted by the manufacture techniques. The spatial correction capability of AO system can be improved by two or more combinational-DMs (CDMs) with conjugation relationship. The CDM AO system for wavefront correction is built, which consists of two 32-element DMs. The experimental results are in agreement with the numerical simulation results. It is indicated that the CDM AO system provides better correction performance than the single 32-element DM AO system.

Liu, Guilin; Yang, Huafeng; Rao, Changhui; Zhang, Yudong; Jiang, Wenhan

2007-10-01

400

Mineralization of antibiotic sulfamethoxazole by photoelectro-Fenton treatment using activated carbon fiber cathode and under UVA irradiation  

Microsoft Academic Search

The mineralization of antibiotic sulfamethoxazole (SMX) of concentrations up to 300mgL?1 was examined by photoelectro-Fenton (PEF) using an activated carbon fiber (ACF) cathode with UVA (365nm) irradiation. Comparative mineralization has been studied by different methods: RuO2\\/Ti anodic oxidation (AO), AO in the presence of electrogenerated H2O2 (AO-H2O2), AO-H2O2 in the presence of UVA (AO-H2O2-UVA), and both the electro-Fenton (EF) and

Aimin Wang; Yu-You Li; Adriana Ledezma Estrada

2011-01-01

401

Healthcare for Obstructive Lung Disease in an Industrial Spirometry Surveillance Program  

PubMed Central

Objective The efficacy of workplace spirometry surveillance programs is unclear. We examine whether aluminum industry workers with airflow obstruction (AO) received health care for obstructive lung disease. Methods We performed a cross sectional analysis over 7 years of 6821 aluminum production workers. The primary outcome was the association between obstructive lung disease insurance claims and the presence of AO. We also examined whether the presence of claims was associated with increasing AO severity. Results Although workers with AO more frequently had claims, 60% of workers with AO, most frequently those with mild and borderline obstruction, had no claim. Conclusions Workers with AO, particularly borderline and mild obstruction, frequently do not receive health care despite respiratory surveillance. Further investigation is needed to determine if workers with undiagnosed AO are symptomatic or have accelerated losses in lung function over time.

Gulati, Mridu; Slade, Martin D.; Fiellin, Martha G.; Cullen, Mark R.

2013-01-01

402

Bioregeneration of mono-amine modified silica and granular activated carbon loaded with Acid Orange 7 in batch system.  

PubMed

The objectives of this study were: (1) to investigate the role of mixed culture of biomass in the regeneration of mono-amine modified silica (MAMS) and granular activated carbon (GAC) loaded with Acid Orange 7 (AO7), (2) to quantify and compare the bioregeneration efficiencies of AO7-loaded MAMS and GAC using the sequential adsorption and biodegradation approach and (3) to evaluate the reusability of bioregenerated MAMS. The results show that considerably higher bioregeneration efficiency of AO7-loaded MAMS as compared to that of AO7-loaded GAC was achieved due to higher reversibility of adsorption of MAMS for AO7 and favorable pH factor resulting in more AO7 desorption. The progressive loss of adsorption capacity of MAMS for AO7 with multiple cycles of use suggests possible chemical and microbial fouling of the adsorption sites. PMID:22704829

Al-Amrani, Waheeba Ahmed; Lim, Poh-Eng; Seng, Chye-Eng; Ngah, Wan Saime Wan

2012-05-26

403

Objective age of acquisition norms for a set of 286 words in Russian: Relationships with other psycholinguistic variables.  

PubMed

Normative data on the objective age of acquisition (AoA) for 286 Russian words are presented in this article. In addition, correlations between the objective AoA and subjective ratings, name agreement, picture name agreement, imageability, familiarity, word frequency, and word length are provided, as are correlations between the objective AoA and two measures of exemplar dominance (exemplar generation frequency and the number of times an exemplar was named first). The correlations between the aforementioned variables are generally consistent with the correlations reported in other normative studies. The objective AoA data are highly correlated with the subjective AoA ratings, whereas the correlations between the objective AoA and other psycholinguistic variables are moderate. The correlations between the objective AoA of Russian words and similar data for other languages are moderately high. The complete word norms may be downloaded from supplementary material. PMID:23435657

Grigoriev, Andrei; Oshhepkov, Ivan

2013-02-23

404

Review. Acridine orange could be an innovative anticancer agent under photon energy.  

PubMed

Acridine orange (AO) was extracted as a dye from coal tar over a hundred years ago. It has various unique biological activities and has been shown to be a useful fluorescent dye specific for DNA and RNA, a pH indicator, photosensitizer, antitumor and antimalarial drug, and detector of bacteria and parasites. It has recently been found that AO accumulates in musculoskeletal sarcomas and that after illumination of the tumors with visible light or irradiation with low-dose X-rays, the dye rapidly exerts selective cytocidal effect against the sarcoma cells. Therefore, surgery combined with photo- (PDT) or radiodynamic therapy (RDT) with AO (AO-PDT and -RDT) has been applied to human musculoskeletal sarcomas. The results of a clinical study on the outcome of this therapeutic strategy revealed that it yielded better local control and remarkably better limb function than wide resectional surgery. Based on our experimental studies, it was clarified that AO accumulates in acidic organelles or structures, especially lysosomes, depending on the acidity. An enormous number of protons are produced in cancer from lactate or CO2 under hypoxic conditions, which are moved into the extracellular fluid or lysosomes to maintain the intracellularfluid pH. Therefore, AO shows marked accumulation in the acidic lysosomes of cancer cells. Photon energy from visible light or X-rays excites the AO accumulated in lysosomes; the excited AO emits fluorescence and forms activated oxygen from intra-cytoplasmic oxygen. The activated oxygen destroys lysosomes, with the released lysosomal enzymes causing rapid death of the cancer cells. On the other hand, normal cells can exclude AO quickly because they are not acidic. Thus, AO-PDT and AO-RDT exhibit strong and selective cytocidal effect against malignant tumors. In conclusion, we believe that AO-PDT and AO-RDT exhibit selective anticancer cell activity and that AO excited by photon energy has excellent potential as an anticancer agent. PMID:17436568

Kusuzaki, Katsuyuki; Murata, Hiroaki; Matsubara, Takao; Satonaka, Haruhiko; Wakabayashi, Toru; Matsumine, Akihiko; Uchida, Atsumasa

405

Developing a consensus framework and risk profile for agents of opportunity in academic medical centers: implications for public health preparedness.  

PubMed

Agents of opportunity (AO) in academic medical centers (AMC) are defined as unregulated or lightly regulated substances used for medical research or patient care that can be used as "dual purpose" substances by terrorists to inflict damage upon populations. Most of these agents are used routinely throughout AMC either during research or for general clinical practice. To date, the lack of careful regulations for AOs creates uncertain security conditions and increased malicious potential. Using a consensus-based approach, we collected information and opinions from staff working in an AMC and 4 AMC-affiliated hospitals concerning identification of AO, AO attributes, and AMC risk and preparedness, focusing on AO security and dissemination mechanisms and likely hospital response. The goal was to develop a risk profile and framework for AO in the institution. Agents of opportunity in 4 classes were identified and an AO profile was developed, comprising 16 attributes denoting information critical to preparedness for AO misuse. Agents of opportunity found in AMC present a unique and vital gap in public health preparedness. Findings of this project may provide a foundation for a discussion and consensus efforts to determine a nationally accepted risk profile framework for AO. This foundation may further lead to the implementation of appropriate regulatory policies to improve public health preparedness. Agents of opportunity modeling of dissemination properties should be developed to better predict AO risk. PMID:21149234

Farmer, Brenna M; Nelson, Lewis S; Graham, Margaret E; Bendzans, Carly; McCrillis, Aileen M; Portelli, Ian; Zhang, Meng; Goldberg, Judith; Rosenberg, Sheldon D; Goldfrank, Lewis R; Tunik, Michael

2010-12-01

406

Identification and quantification of atractylenolide I and atractylenolide III in Rhizoma Atractylodes Macrocephala by liquid chromatography-ion trap mass spectrometry.  

PubMed

Rhizoma Atractylodes Macrocephala (RAM) is an important traditional Chinese medicinal herb that is used for treatment of dyspepsia and anorexia. The active ingredients, atractylenolide I (AO-I) and atractylenolide III (AO-III), were identified by direct-injection ion trap-mass spectrometry (IT-MS) for collecting MS(n) spectra. The major fragment ions of AO-I and AO-III were confirmed by MS(n) both in negative ion mode and in positive ion mode. The possible main cleavage pathway of fragment ions was studied. The determinations of AO-I and AO-III were accomplished by liquid chromatography (LC) with UV and MS. The analytes provided good signals corresponding to the protonated molecular ions [M + H](+) and product ions. The precursor ions and product ions for quantification of AO-III and AO-I were m/z 249 ? 231 and m/z 233 ? 215, respectively, using selected ion monitoring by LC-IT-MS. Two methods were evaluated for a number of validation characteristics (repeatability, limit of detection, calibration range, and recovery). MS provides a high selectivity and sensitivity for determination of AO-III and AO-I in positive mode. After optimization of the methods, separation, identification and quantification of the two components in RAM were comprehensively tested by HPLC with UV and MS. PMID:23175447

Chen, Qinhua; He, Hongsheng; Li, Peng; Zhu, Jun; Xiong, Min

2012-11-23

407

Global warming trend without the contributions from decadal variability of the Arctic Oscillation  

NASA Astrophysics Data System (ADS)

Climate change associated with recent global warming is most prominent in the Arctic and subarctic. The Arctic Oscillation (AO) is a dominant atmospheric phenomenon in the Northern Hemisphere. Decadal variability of surface air temperature (SAT) associated with the AO index shows high correlation with recent global warming trend. In this study, the SAT variability in the Northern Hemisphere is separated in contributions from decadal variability by the AO and remaining components.The results indicate that the decadal variability of the AO index shows high correlation with the SAT variation until 1990. The AO index and SAT variabilities show a negative trend during 1949-1969, while the trend is positive during 1969-1989. In addition, the spatial distribution pattern of the SAT linear trend during each period shows the same pattern as AO. However, while the AO index indicates a negative trend, the SAT trend is continuously positive also after 1990. This warming pattern appearing after 1990 is caused by the Arctic amplification.Although the AO has a large amplitude on local scale, the AO is almost dynamically orthogonal to the hemispheric warming component. However, the AO can be related to the decadal variability of the Arctic and subarctic temperature change through the feedbacks by climate sub-systems.

Nagato, Yuta; Tanaka, H. L.

2012-04-01

408

Is visual resolution after adaptive optics correction susceptible to perceptual learning?  

PubMed

The visual benefit of correcting high-order aberrations may not be fully realized due to neural mechanisms that compensate for the aberrations of the eye. We examined the extent to which these neural mechanisms might be susceptible to perceptual learning in an adaptive optics (AO)-corrected test of visual resolution. Visual resolution was measured in an adaptive optics scanning laser ophthalmoscope (AOSLO) in 3 conditions: (1) low-order correction (defocus and astigmatism) without AO, (2) 3-mm pupil with AO correction, and (3) 5.81-mm pupil with AO correction. Measurements were made on both eyes in all three conditions before training. Subjects underwent 5 days of monocular training in both AO-corrected conditions and were retested in all three conditions in both eyes after training. The range of minimum angle of resolution (MAR) for each condition was: (1) without AO: 0.53-0.95 arcmin, (2) AO 3-mm pupil: 0.33-0.6 arcmin, and (3) AO 5.81-mm pupil: 0.36-0.56 arcmin. AO correction provided an immediate and significant improvement in visual resolution. There was no significant difference in resolution when correcting aberrations over a 5.81-mm pupil versus a 3-mm pupil. Training on this task provided a minimal improvement in performance. Adaptation to aberrations did not hinder AO correction from providing an immediate visual benefit. PMID:21047743

Rossi, Ethan A; Roorda, Austin

2010-10-01

409

Molecular cloning of the cDNA coding for mouse aldehyde oxidase: tissue distribution and regulation in vivo by testosterone.  

PubMed Central

The cDNA coding for mouse aldehyde oxidase (AO), a molybdoflavoprotein, has been isolated and characterized. The cDNA is 4347 nt long and consists of an open reading frame predicting a polypeptide of 1333 amino acid residues, with 5' and 3' untranslated regions of 13 and 335 nt respectively. The apparent molecular mass of the translation product in vitro derived from the corresponding cRNA is consistent with that of the monomeric subunit of the AO holoenzyme. The cDNA codes for a catalytically active form of AO, as demonstrated by transient transfection experiments conducted in the HC11 mouse mammary epithelial cell line. The deduced primary structure of the AO protein contains consensus sequences for two distinct 2Fe-2S redox centres and a molybdopterin-binding site. The amino acid sequence of the mouse AO has a high degree of similarity with the human and bovine counterparts, and a significant degree of relatedness to AO proteins of plant origin. Northern blot and in situ hybridization analyses demonstrate that hepatocytes, cardiocytes, lung endothelial or epithelial cells and oesophagus epithelial cells express high levels of AO mRNA. In the various tissues and organs considered, the level of AO mRNA expression is not strictly correlated with the amount of the corresponding protein, suggesting that the synthesis of the AO enzyme is under translational or post-translational control. In addition, we observed sex-related regulation of AO protein synthesis. In the liver of male animals, despite similar amounts of AO mRNA, the levels of the AO enzyme and corresponding polypeptide are significantly higher than those in female animals. Treatment of female mice with testosterone increases the amounts of AO mRNA and of the relative translation product to levels similar to those in male animals.

Kurosaki, M; Demontis, S; Barzago, M M; Garattini, E; Terao, M

1999-01-01

410

Physical and chemical effects of direct aqueous advanced oxidation processing on green sand foundry mold materials  

NASA Astrophysics Data System (ADS)

Iron foundries using the common green sand molding process have increasingly been incorporating aqueous advanced oxidation (AO) systems to reduce the consumption of sand system bentonite clay and coal raw materials by and to decrease their volatile organic compound (VOC) emissions. These AO systems typically use a combination of sonication, ozone aeration, and hydrogen peroxide to treat and recycle slurries of sand system baghouse dust, which is rich in clay and coal. While the overall effects of AO on raw material consumption and organic emissions are known, the mechanisms behind these effects are not well understood. This research examined the effects of bench-scale direct aqueous AO processing on green sand mold materials at the micro level. Bench-scale AO processing, including acoustic sonication, ozone/oxygen aeration, and hydrogen peroxide dramatically decreased the particle sizes of both western bentonite and foundry sand system baghouse dust. Bench-scale AO processing was shown to effectively separate the clay material from the larger silica and coal particles and to extensively break up the larger clay agglomerates. The acoustic sonication component of AO processing was the key contributor to enhanced clay recovery. Acoustic sonication alone was slightly more effective than combined component AO in reducing the particle sizes of the baghouse dust and in the recovery of clay yields in the supernatant during sedimentation experiments. Sedimentation separation results correlated well with the increase in small particle concentrations due to AO processing. Clay suspension viscosity decreased with AO processing due to enhanced dispersion of the particles. X-ray diffraction of freeze-dried baghouse dust indicated that AO processing does not rehydrate calcined montmorillonite and does not increase the level of interlayer water hydration in the dry clays. Zeta potential measurements indicated that AO processing also does not produce any large changes in the surface charge of the small clay particles upon AO treatment.

Clobes, Jason Kenneth

411

Report to Congress on abnormal occurrences, fiscal year 1997. Volume 20  

SciTech Connect

Section 208 of the Energy Reorganization Act of 1974 identifies an abnormal occurrence (AO) as an unscheduled incident or event that the Nuclear Regulatory Commission (NRC) determines to be significant from the standpoint of public health or safety. The Federal Reports Elimination and Sunset Act of 1995 requires that AOs be reported to Congress on an annual basis. This report includes those events that NRC has determined to be AOs during fiscal year 1997. This report addresses two AOs at NRC licensed facilities. One involved an event at a nuclear power plant, and one involved materials overexposure. The report also addresses four Agreement State AOs. Two of these AOs involved overexposures and two involved radiopharmaceutical misadministrations. In addition, Appendix C of the report includes five events of loss of control of licensed materials.

NONE

1998-04-01

412

MEMS- and LC-adaptive optics at the Naval Research Laboratory  

NASA Astrophysics Data System (ADS)

Adaptive Optics (AO) is an ensemble of techniques that aims at the remedial of the deleterious effects that the Earth's turbulent atmosphere induces on both imagery and signal gathering in real time. It has been over four decades since the first AO system was developed and tested. During this time important technological advances have changed profoundly the way that we think and develop AO systems. The use of Micro-Electro-Mechanical-Systems (MEMS) devices and Liquid Crystal Devices (LCD) has revolutionized these technologies making possible to go from very expensive, very large and power consuming systems to very compact and inexpensive systems. These changes have rendered AO systems useful and applicable in other fields ranging from medical imaging to industry. In this paper we will review the research efforts at the Naval research Laboratory (NRL) to develop AO systems based on both MEMs and LCD in order to produce more compact and light weight AO systems.

Restaino, S. R.; Wilcox, C. C.; Martinez, T.; Andrews, J. R.; Santiago, F.; Payne, D. M.

2012-05-01

413

A Status Report on the Thirty Meter Telescope Adaptive Optics Program  

NASA Astrophysics Data System (ADS)

We provide an update on the recent development of the adaptive optics (AO) systems for the Thirty Meter Telescope (TMT) since mid-2011. The first light AO facility for TMT consists of the Narrow Field Infra-Red AO System (NFIRAOS) and the associated Laser Guide Star Facility (LGSF). This order 60 × 60 laser guide star (LGS) multi-conjugate AO (MCAO) architecture will provide uniform, diffraction-limited performance in the J, H and K bands over 17-30 arcsec diameter fields with 50 per cent sky coverage at the galactic pole, as is required to support TMT science cases. The NFIRAOS and LGSF subsystems completed successful preliminary and conceptual design reviews, respectively, in the latter part of 2011. We also report on progress in AO component prototyping, control algorithm development, and system performance analysis, and conclude with an outline of some possible future AO systems for TMT.

Ellerbroek, B. L.

2013-06-01

414

Both concreteness and age-of-acquisition affect reading accuracy but only concreteness affects comprehension in a deep dyslexic patient  

Microsoft Academic Search

As concreteness correlates very highly with the age-of-acquisition (AoA) of words, we attempted to disentangle the effects of these two variables in the oral reading and comprehension performance of the deep dyslexic patient LW. The results of a multiple regression analysis of LW’s reading of 217 words showed that both AoA and concreteness affect reading accuracy, with the AoA effect

Christopher Barry; Simon Gerhand

2003-01-01

415

Isolation and Characterization of the Aldehyde Oxidase2 Gene from Arachis hypogaea L  

Microsoft Academic Search

An aldehyde oxidase gene, designated as aldehyde oxidase2 (AhAO2), was cloned from Arachis hypogaea L. The gene contained a 4,050-bp open reading frame that encoded a putative protein of 1,350 amino acids. The deduced amino\\u000a acid sequence showed high identity with other plant AOs. The organ-specific expression pattern of AhAO2 has been examined, which indicates its dominant expression in leaves

Lixia Yang; Jianhua Liang; Wenling Zhou; Liangchen Su; Biyu Zhang; Ling Li

2011-01-01

416

Aorto-septal angle in Boxer dogs with subaortic stenosis: An echocardiographic study  

Microsoft Academic Search

The present study was designed to determine the aorto-septal angle (AoSA) in Boxer dogs with or without subaortic stenosis (SAS) by using two-dimensional echocardiography. Forty-five Boxer dogs were prospectively included in the study. The AoSA was steeper in the group with SAS than in healthy Boxers with a mean difference of 10°. According to the proposed regression model, the AoSA

Cecilia Quintavalla; Stefano Guazzetti; Antonia Mavropoulou; Claudio Bussadori

2010-01-01

417

The Adaptive Optics Summer School Laboratory Activities  

NASA Astrophysics Data System (ADS)

Adaptive Optics (AO) is a new and rapidly expanding field of instrumentation, yet astronomers, vision scientists, and general AO practitioners are largely unfamiliar with the root technologies crucial to AO systems. The AO Summer School (AOSS), sponsored by the Center for Adaptive Optics, is a week-long course for training graduate students and postdoctoral researchers in the underlying theory, design, and use of AO systems. AOSS participants include astronomers who expect to utilize AO data, vision scientists who will use AO instruments to conduct research, opticians and engineers who design AO systems, and users of high-bandwidth laser communication systems. In this article we describe new AOSS laboratory sessions implemented in 2006-2009 for nearly 250 students. The activity goals include boosting familiarity with AO technologies, reinforcing knowledge of optical alignment techniques and the design of optical systems, and encouraging inquiry into critical scientific questions in vision science using AO systems as a research tool. The activities are divided into three stations: Vision Science, Fourier Optics, and the AO Demonstrator. We briefly overview these activities, which are described fully in other articles in these conference proceedings (Putnam et al., Do et al., and Harrington et al., respectively). We devote attention to the unique challenges encountered in the design of these activities, including the marriage of inquiry-like investigation techniques with complex content and the need to tune depth to a graduate- and PhD-level audience. According to before-after surveys conducted in 2008, the vast majority of participants found that all activities were valuable to their careers, although direct experience with integrated, functional AO systems was particularly beneficial.

Ammons, S. M.; Severson, S.; Armstrong, J. D.; Crossfield, I.; Do, T.; Fitzgerald, M.; Harrington, D.; Hickenbotham, A.; Hunter, J.; Johnson, J.; Johnson, L.; Li, K.; Lu, J.; Maness, H.; Morzinski, K.; Norton, A.; Putnam, N.; Roorda, A.; Rossi, E.; Yelda, S.

2010-12-01

418

Performance of Subaru Cassegrain Adaptive Optics System  

Microsoft Academic Search

The design and performance of the Cassegrain Adaptive Optics (AO) system for the 8.2m Subaru Telescope are reported. The system is based on a curvature wavefront sensor with 36 photon-counting avalanche photodiode modules and a bimorph wavefront correcting deformable mirror with 36 driving electrodes. The engineering first light of the AO system took place in 2000 December. The AO system

Hideki Takami; Naruhisa Takato; Yutaka Hayano; Masanori Iye; Shin Oya; Yukiko Kamata; Tomio Kanzawa; Yosuke Minowa; Masashi Otsubo; Koji Nakashima; Wolfgang Gaessler; David Saint-Jacques

2004-01-01

419

Symmetric nonblocking integrated acoustooptic space-division switch array modules on LiNbO3  

Microsoft Academic Search

The realization of compact integrated optic 4×4 and 8×8 switch modules on LiNbO3 using the proposed symmetric acoustooptic (AO) space-division switch architecture is reported. The working principle, the design, the fabrication and the experimental results of these AO space-switch modules at the optical wavelength of 0.6328 ?m are presented. The integrated AO space switch modules consist of a new hybrid

Arjun Kar-Roy; Chen S. Tsai

1991-01-01

420

Wound response in passion fruit ( Passiflora f. edulis flavicarpa ) plants: gene characterization of a novel chloroplast-targeted allene oxide synthase up-regulated by mechanical injury and methyl jasmonate  

Microsoft Academic Search

The induction of a chloroplast-localized 13-lipoxygenase (13-LOX) in passion fruit leaves in response to methyl jasmonate\\u000a (MeJa) was previously reported. Since allene oxide synthase (AOS) is a key cytochrome P450 enzyme in the oxylipin pathway\\u000a leading to AOS-derived jasmonates, the results above led in turn to an investigation of AOS in our model plant. Spectrophotometric\\u000a assays showed that 24 h exposure

César L. Siqueira-Júnior; Bruno C. Jardim; Turán P. Ürményi; Ana C. P. Vicente; Ekkehard Hansen; Koko Otsuki; Maura da Cunha; Hérika C. Madureira; Deivid R. de Carvalho; Tânia Jacinto

2008-01-01

421

The effects of age of acquisition on an object classification task  

Microsoft Academic Search

The age at which an item is acquired (age of acquisition; AoA) affects naming latencies for words, objects, and faces. Ellis and Lambon Ralph (2000) proposed an account of AoA that predicts its effect in any task requiring access to stored information. AoA effects have been found in non-naming tasks for faces (e.g., Lewis, 1999) and words (e.g., Brysbaert, van

Jon. C. Catling; Robert A. Johnston

2006-01-01

422

The varying effects of age of acquisition  

Microsoft Academic Search

There are a number of theories that suggest that age of acquisition (AoA) effects are not uniform across different tasks. Catling and Johnston (2006a) found greater AoA effects within an object-naming task than in a semantic classification task. They explained these findings by suggesting that AoA effects might accumulate according to how many levels of representation a task necessitates access

Jonathan C. Catling; Robert A. Johnston

2009-01-01

423

Short article Age of acquisition predicts naming and lexical-decision performance above and beyond 22 other predictor variables: An analysis of 2,342 words  

Microsoft Academic Search

Age of acquisition (AoA) ratings were obtained and were used in hierarchical regression analyses to predict naming and lexical-decision performance for 2,342 words (from Balota, Cortese, Sergent- Marshall, Spieler, & Yap, 2004). In the analyses, AoA was included in addition to the set of predictors used by Balota et al. (2004). AoA significantly predicted latency performance on both tasks above

Michael J. Cortese; Maya M. Khanna

2007-01-01

424

Age of acquisition predicts naming and lexical-decision performance above and beyond 22 other predictor variables: An analysis of 2,342 words  

Microsoft Academic Search

Age of acquisition (AoA) ratings were obtained and were used in hierarchical regression analyses to predict naming and lexical-decision performance for 2,342 words (from Balota, Cortese, Sergent-Marshall, Spieler, & Yap, 2004). In the analyses, AoA was included in addition to the set of predictors used by Balota et al. (2004). AoA significantly predicted latency performance on both tasks above and

Michael J. Cortese; Maya M. Khanna

2007-01-01

425

Effects of Age-of-Acquisition in the Word-Fragment Completion Task: Evidence for an Orthographic Locus in Implicit Memory  

Microsoft Academic Search

Barry, Hirsh, Johnston, and Williams (2001) found that Age-of-Acquisition (AoA) interacted with repetition priming in the picture naming task (greater priming for late- than for early-acquired words), and proposed that AoA might affect the stage of access to lexical-phonological representations. The present experiment examined the possibility that AoA may influence the retrieval of visual-orthographic information, by studying its effects in

Pietro Spataro; Neil W. Mulligan; Emiddia Longobardi; Clelia Rossi-Arnaud

2011-01-01

426

Application of Number: an investigation into a theoretical framework for understanding the production and reproduction of pedagogical practices  

Microsoft Academic Search

Abstract This study focused on Application of Number (AoN), one of the Key Skills in GNVQs. It drew on quantitative and qualitative data (a survey and case studies) to describe how,AoN was organised,in different schools and colleges. The data illustrate thatthere was diversity in AoN provision, a finding supported,by other literature. This diversity in provision can be explained by the

Mhairi McAlpine; Jackie Greatorex

427

Age of acquisition, word frequency, and picture–word interference  

Microsoft Academic Search

In two experiments participants named pictures superimposed with unrelated words. The age of acquisition (AoA) of the picture names was manipulated. Additionally, the word frequency (WF, Experiment 1) or AoA (Experiment 2) of the interfering distractor words was manipulated. Early-acquired pictures were named faster than their late-acquired counterparts. Both WF and AoA modulated the degree of interference from the irrelevant

Jonathan C. Catling; Kevin Dent; Robert A. Johnston; Richard Balding

2010-01-01

428

Serum biomarker analysis of collagen disease patients with acute-onset diffuse interstitial lung disease  

PubMed Central

Background Interstitial lung disease (ILD) is frequently associated with collagen diseases. The prognosis of acute-onset diffuse ILD (AoDILD) occurring in collagen disease patients is very poor. Here, we investigated serum biomarker profiles of AoDILD to find markers predicting outcome in patients with collagen diseases. Methods A solid-phase antibody array was used for screening 274 biomarkers in pooled sera from collagen disease patients in the AoDILD state and in the stable state. Biomarkers in individual sera were detected without pooling by bead-based immunoassay. Results The serum levels of matrix metalloproteinase (MMP)-1, tissue inhibitor of metalloproteinase (TIMP)-1, osteopontin, interleukin (IL)-2 receptor ? (IL-2R?), and IL-1 receptor antagonist were significantly increased in AoDILD, but TIMP-2, MMP-3, and eotaxin 2 levels were decreased. The MMP-3 to MMP-1 ratio was reduced in AoDILD state. This tendency was also observed in RA patients with AoDILD. Moreover, serum IL-6 level was significantly increased in the AoDILD state in patients with acute exacerbation of ILD (AE-ILD). Serum TIMP-1 and IL-2R? levels were significantly increased in the AoDILD state in patients with drug-induced ILD (DI-ILD), whereas TIMP-2, MMP-3, and eotaxin 2 levels were decreased. The MMP-3 to MMP-1 ratio was reduced in AoDILD state in patients with DI-ILD. The serum TIMP-3, MMP-9, osteopontin, IL-2R?, MMP-1, and MMP-8 levels were significantly increased in the AoDILD state in patients who subsequently died, whereas TIMP-2 and MMP-3 levels were decreased in those who survived. The MMP-3 to MMP-1 ratio was reduced in AoDILD state in patients who died, but not in those who survived. Conclusions Serum biomarker profiles could represent prognosis markers for AoDILD in collagen diseases.

2013-01-01

429

Some experimental results provided by the ska-3 , uvsips, imap3 experiments on board the interball-2. A case study  

Microsoft Academic Search

On board the Auroral satellite the magnetometer IMAP- 3 (STIL) and SKA-3 provide in-situ characteristics of the magnetic field , and of the electrons and ions, respectively. The UV Spectrometer UVSIPS maps ionospheric auroral characteristics in the magnetic field line foot print in 3 lines: 1304 A^o, 1356 A^o and 1493 A^o. On 10\\/27\\/1996 a phenomenon was found at the

K. Palazov; A. Bochev; S. Spasov; A. Manev; S. Raykov; A. Kuzmin; F. Shuiskaya; N. Esmont; V. Prokhorenko

2003-01-01

430

Short article The effects of age of acquisition and frequency trajectory on object naming: Comments on Perez (2007)  

Microsoft Academic Search

Perez (2007) reported that objective age of acquisition (AoA) was a major determinant of adult object naming latencies when frequency trajectory and cumulative frequency were included in the same regression analysis. In this comment, we discuss several issues concerning the influence of frequency trajectory and AoA and argue that objective AoA is a behavioural outcome and a natural covariate of

Patrick Bonin; Alain Meot; Martial Mermillod; Ludovic Ferrand; Christopher Barry

431

NASA Wiring for Space Applications Program test results  

NASA Astrophysics Data System (ADS)

The objectives of the NASA Wiring for Space Applications program were to investigate the effects of atomic oxygen (AO), ultraviolet (UV) radiation, and AO with UV synergistic effects on wire insulation materials. The AO exposure was on the order of 10(exp 21) atoms/sq cm and the vacuum UV radiation was on the order of 10,000 ESH. The results of these tests are presented in this document

Vaughn, Jason A.

1995-11-01

432

The nonlinear association between the Arctic Oscillation and North American winter climate  

Microsoft Academic Search

Nonlinear projections of the Arctic Oscillation (AO) index onto North American winter (December–March) 500-mb geopotential\\u000a height (Z500) and surface air temperature (SAT) anomalies reveal a pronounced asymmetry in the atmospheric patterns associated\\u000a with positive and negative phases of the AO. In a linear view, the Z500 anomaly field associated with positive AO resembles\\u000a a positive North Atlantic Oscillation pattern with

Aiming Wu; William W. Hsieh; Amir Shabbar; George J. Boer; Francis W. Zwiers

2006-01-01

433

Improving adaptive optical systems by the use of multiple laser beacon configurations  

Microsoft Academic Search

The field of adaptive optics (AO) and laser-beacon AO has been successfully implemented in the last part of the 20th century. Adaptive optics greatly improves the resolution capabilities of ground-based telescopes by correcting for atmospheric turbulence. The initial implementation of laser-beacon AO was done on relatively small telescopes, on the order of 1.5 m. However, with larger aperture telescopes being

Imelda Atencio de La Rue

2003-01-01

434

Predicting outcome of assertive outreach across England  

Microsoft Academic Search

Background  Assertive community treatment for the severely mentally ill is being implemented increasingly internationally. It is unclear\\u000a whether recommended characteristics of assertive outreach (AO) teams influence care and outcomes. We hypothesised that recommended\\u000a characteristics of AO teams such as joint health and social care management would predict reduced hospitalisation in the first\\u000a year of an AO client programme and related outcomes

T. S. Brugha; N. Taub; J. Smith; Z. Morgan; T. Hill; H. Meltzer; C. Wright; T. Burns; S. Priebe; J. Evans; T. Fryers

435

Ethanolamine and related amino alcohols increase basal and evoked release of [ 3H]- d-aspartic acid from synaptosomes by enhancing the filling of synaptic vesicles  

Microsoft Academic Search

This research examines the effects of ethanolamine and other amino alcohols on the dynamics of acridine orange (AO), oxonol V, and [3H]-d-aspartic acid in synaptic preparations isolated from mammalian brain. Ethanolamine concentration-dependently enhanced AO release from synaptosomes. Similar effects were observed with methylethanolamine and dimethylethanolamine, but not choline. The enhancement of AO efflux by ethanolamine was independent of extrasynaptosomal calcium

Chengyong Liao; Russell A. Nicholson

2007-01-01

436

Adaptive Optics Systems for the Thirty Mirror Telescope  

Microsoft Academic Search

At first light, the overall AO system architecture for the Thirty Meter Telescope will consist of the Narrow Field Infra-Red AO System (NFIRAOS) and the associated Laser Guide Star Facility (LGSF). NFIRAOS is an order 60x60, dual conjugate, laser guide star AO system designed to obtain diffraction-limited performance in the near IR with high sky coverage. It will provide a

Brent Ellerbroek

2010-01-01

437

Compact adaptive optic-optical coherence tomography system  

DOEpatents

Badal Optometer and rotating cylinders are inserted in the AO-OCT to correct large spectacle aberrations such as myopia, hyperopic and astigmatism for ease of clinical use and reduction. Spherical mirrors in the sets of the telescope are rotated orthogonally to reduce aberrations and beam displacement caused by the scanners. This produces greatly reduced AO registration errors and improved AO performance to enable high order aberration correction in a patient eyes.

Olivier, Scot S. (Livermore, CA); Chen, Diana C. (Fremont, CA); Jones, Steven M. (Danville, CA); McNary, Sean M. (Stockton, CA)

2012-02-28

438

Compact adaptive optic-optical coherence tomography system  

DOEpatents

Badal Optometer and rotating cylinders are inserted in the AO-OCT to correct large spectacle aberrations such as myopia, hyperopic and astigmatism for ease of clinical use and reduction. Spherical mirrors in the sets of the telescope are rotated orthogonally to reduce aberrations and beam displacement caused by the scanners. This produces greatly reduced AO registration errors and improved AO performance to enable high order aberration correction in a patient eyes.

Olivier, Scot S. (Livermore, CA); Chen, Diana C. (Fremont, CA); Jones, Steven M. (Danville, CA); McNary, Sean M. (Stockton, CA)

2011-05-17

439

Advanced Adaptive Optics Technology Development  

SciTech Connect

The NSF Center for Adaptive Optics (CfAO) is supporting research on advanced adaptive optics technologies. CfAO research activities include development and characterization of micro-electro-mechanical systems (MEMS) deformable mirror (DM) technology, as well as development and characterization of high-resolution adaptive optics systems using liquid crystal (LC) spatial light modulator (SLM) technology. This paper presents an overview of the CfAO advanced adaptive optics technology development activities including current status and future plans.

Olivier, S

2001-09-18

440

Modified self-deconvolution restoration algorithm for adaptive-optics solar images.  

PubMed

The correction conducted by adaptive optics (AO) is partially due to limitations of the hardware. A postprocessing method, such as blind deconvolution, is used to improve image quality. In this Letter, a modified self-deconvolving data reconstruction algorithm, in which the information recorded by the wavefront sensor in closed-loop status is applied to estimate the deconvolution operator, is proposed for AO image deconvolution. This method is applied in deconvolving solar images captured by a 37-element AO system. The result shows that the method is efficient for improving image quality corrected by AO. PMID:20680051

Tian, Yu; Rao, Changhui; Zhu, Lei; Rao, Xuejun

2010-08-01

441

Direct imaging of extra-solar planets  

SciTech Connect

Direct imaging of extra-solar planets may be possible with the new generation of large ground-based telescopes equipped with state- of- the-art adaptive optics (AO) systems to compensate for the blurring effect of the Earth`s atmosphere. The first of these systems is scheduled to begin operation in 1998 on the 10 in Keck II telescope. In this paper, general formulas for high-contrast imaging with AO systems are presented and used to calculate the sensitivity of the Keck AO system. The results of these calculations show that the Keck AO system should achieve the sensitivity necessary to detect giant planets around several nearby bright stars.

Olivier, S.S.; Max, V.E.; Brase, J.M.; Caffano, C.J.; Gavel, D.T.; Macintosh, B.A.

1997-03-01

442

Nonlinear impact of the Arctic Oscillation on extratropical surface air temperature  

NASA Astrophysics Data System (ADS)

The Arctic Oscillation (AO) is the leading climate mode of sea level pressure (SLP) anomalies during cold season in the Northern Hemisphere. To a large extent, the atmospheric climate anomalies associated with positive and negative phases of the AO are opposite to each other, indicating linear impact. However, there is also significant nonlinear relationship between the AO and other winter climate variability. We investigate nonlinear impacts of the AO on surface air temperature (SAT) using reanalysis data and a multimillennial long climate simulation. It is found that SAT response to the AO, in terms of both spatial pattern and magnitude, is almost linear when the amplitude of the AO is moderate. However, the response becomes quite nonlinear as the amplitude of the AO becomes stronger. First, the pattern shift in SAT depends on AO phase and magnitude, and second, the SAT magnitude depends on AO phase. In particular, these nonlinearities are distinct over the North America and Eurasian Continent. Based on the analyses of model output, we suggest that the nonlinear zonal advection term is one of the critical components in generating nonlinear SAT response, particularly over the North America.

Son, Hye-Young; Park, Wonsun; Jeong, Jee-Hoon; Yeh, Sang-Wook; Kim, Baek-Min; Kwon, Minho; Kug, Jong-Seong

2012-10-01

443

Adaptive optics real time processing design for the advanced technology solar telescope  

NASA Astrophysics Data System (ADS)

The four meter Advanced Technology Solar Telescope (ATST) adaptive optics (AO) system will require at least twenty-four times the real time processing power as the Dunn Solar Telescope AO system. An FPGA solution for ATST AO real time processing is being pursued instead of the parallel DSP approach used for the Dunn AO76 system. An analysis shows FPGAs will have lower latency and lower hardware cost than an equivalent DSP solution. Interfacing to the proposed high speed camera and the deformable mirror will be simpler and have lower latency than with DSPs. This paper will discuss the current design and progress toward implementing the FPGA solution.

Richards, Kit

2012-07-01

444

Disease Modifying Therapies for Alzheimer's Disease Targeting A? Oligomers: Implications for Therapeutic Mechanisms  

PubMed Central

Several lines of evidence indicate that amyloid ? (A?), particularly A? oligomers (A?Os), plays a causative role in Alzheimer's disease. However, the mechanisms underlying the action of an anti-A?O antibody to clarify the toxic action of A?Os remain elusive. Here, we showed that the anti-A?O antibody (monoclonal 72D9) can modify the A? aggregation pathway. We also found that 72D9 directly sequesters both extracellular and intraneuronal A?Os in a nontoxic state. Thus, therapeutic intervention targeting A?Os is a promising strategy for neuronal protection in Alzheimer's disease.

Matsubara, Etsuro; Oono, Hideto; Nakata, Takashi; Wakasaya, Yasuhito; Kawarabayashi, Takeshi; Shoji, Mikio

2013-01-01

445

Acridine orange staining and radiometric detection of microorganisms in blood cultures  

SciTech Connect

To determine whether acridine orange (AO) staining of blood cultures could be used as a substitute for blind subculture when used in conjunction with the BACTEC system (Johnston Laboratories, Inc., Towson, Md.), the two methods were compared on all BACTEC-negative specimens. Since blind subcultures were routinely performed in our laboratory on days 2 and 6 of incubation, AO staining was also performed on these days. Cultures which were BACTEC positive on day 1 of incubation were not included in the study. Of the 2,395 bottles tested after 2 days of incubation, 106 were subculture positive. Of these, 96 (90.6%) were also AO positive and BACTEC positive, 3 (2.8%) were AO positive and BACTEC negative, and 7 (6.6%) were AO negative and BACTEC positive. Of the 3,487 bottles tested on day 6 of incubation, 14 were subculture positive; 7 (50%) of these were AO positive and BACTEC positive, and seven were AO positive and BACTEC negative. Of the total of 10 culture-positive bottles missed by BACTEC, all were positive, and all 10 companion aerobic bottles were BACTEC positive. In both phases of the experiment, there was a total of only four false-positive AO stains. As a result of this investigation, we have substituted AO staining for blind subculturing of BACTEC-negative bottles.

Burdash, N.M.; Manos, J.P.; Bannister, E.R.; Welborn, A.L.

1983-03-01

446

Expression of Allene Oxide Synthase Determines Defense Gene Activation in Tomato1  

PubMed Central

Allene oxide synthase (AOS; hydroperoxide dehydratase; EC 4.2.1.92) catalyzes the first step in the biosynthesis of jasmonic acid from lipoxygenase-derived hydroperoxides of free fatty acids. Using the AOS cDNA from tomato (Lycopersicon esculentum), in which the role of jasmonic acid in wound-induced defense gene activation has been best described, we examined the kinetics of AOS induction in response to wounding and elicitors, in parallel with that of the wound-inducible PIN II (proteinase inhibitor II) gene. AOS was induced in leaves by wounding, systemin, 12-oxophytodienoic acid, and methyl jasmonate. The levels of AOS mRNA started declining by 4 h after induction, whereas the levels of PIN II mRNA continued to increase up to 20 h after induction. Salicylic acid inhibited AOS and PIN II expression, and the addition of 12-oxophytodienoic acid or methyl jasmonate did not prevent the inhibition of PIN II expression in the presence of salicylic acid. Ethylene induced the expression of AOS, but the presence of ethylene alone did not produce an optimal induction of PIN II. The addition of silver thiosulfate, an ethylene action inhibitor, prevented the wound-induced expression of both AOS and PIN II. Products of hydroperoxide lyase affected neither AOS nor PIN II, but induced expression of prosystemin. Based on these results, we propose an updated model for defense gene activation in tomato.

Sivasankar, Sobhana; Sheldrick, Bay; Rothstein, Steven J.

2000-01-01

447

Nitric oxide mediates alginate oligosaccharides-induced root development in wheat (Triticum aestivum L.).  

PubMed

Alginate oligosaccharides (AOS), which are marine oligosaccharides, are involved in regulating plant root growth, but the promotion mechanism for AOS remains unclear. Here, AOS (10-80 mg L(-1)) were found to induce the generation of nitric oxide (NO) in the root system of wheat (Triticum aestivum L.), which promoted the formation and elongation of wheat roots in a dose-dependent manner. NO inhibitors suggested that nitrate reductase (NR), rather than nitric oxide synthase (NOS), was essential for AOS-induced root development. Further studies confirmed that AOS-induced NO generation in wheat roots by up-regulating the gene expression and enzyme activity of NR at the post-transcriptional level. The anatomy and RT-PCR results showed that AOS accelerated the division and growth of stele cells, leading to an increase in the ratio of stele area to root transverse area. This could be inhibited by the NR inhibitor, sodium tungstate, which indicated that NO catalyzed by the NR was involved in AOS regulation of root development. Taken together, in the early stage of AOS-induced root development, NO generation was a novel mechanism by which AOS regulated plant growth. The results also showed that this marine resource could be widely used for crop development. PMID:23872742

Zhang, Yunhong; Liu, Hang; Yin, Heng; Wang, Wenxia; Zhao, Xiaoming; Du, Yuguang

2013-07-03

448

Expression of allene oxide synthase determines defense gene activation in tomato.  

PubMed

Allene oxide synthase (AOS; hydroperoxide dehydratase; EC 4.2.1.92) catalyzes the first step in the biosynthesis of jasmonic acid from lipoxygenase-derived hydroperoxides of free fatty acids. Using the AOS cDNA from tomato (Lycopersicon esculentum), in which the role of jasmonic acid in wound-induced defense gene activation has been best described, we examined the kinetics of AOS induction in response to wounding and elicitors, in parallel with that of the wound-inducible PIN II (proteinase inhibitor II) gene. AOS was induced in leaves by wounding, systemin, 12-oxophytodienoic acid, and methyl jasmonate. The levels of AOS mRNA started declining by 4 h after induction, whereas the levels of PIN II mRNA continued to increase up to 20 h after induction. Salicylic acid inhibited AOS and PIN II expression, and the addition of 12-oxophytodienoic acid or methyl jasmonate did not prevent the inhibition of PIN II expression in the presence of salicylic acid. Ethylene induced the expression of AOS, but the presence of ethylene alone did not produce an optimal induction of PIN II. The addition of silver thiosulfate, an ethylene action inhibitor, prevented the wound-induced expression of both AOS and PIN II. Products of hydroperoxide lyase affected neither AOS nor PIN II, but induced expression of prosystemin. Based on these results, we propose an updated model for defense gene activation in tomato. PMID:10759530

Sivasankar, S; Sheldrick, B; Rothstein, S J

2000-04-01

449

A Simple Approach To Detect Caffeine in Tea Beverages.  

PubMed

The photophysical properties of commercially available dye Acridine Orange (AO) describe an excellent probe for selective and sensitive detection of caffeine in aqueous solution. AO exists in monomer-dimer equilibrium in water. AO monomer is a fluorophore, but the dimer is not. Addition of caffeine to the AO leads to a shift in the monomer-dimer equilibrium toward the direction of AO monomer (fluorophore) and results in enhancement of AO fluorescence intensity. Enhancement of AO fluorescence intensity in the presence of caffeine has been treated as a signal for caffeine sensor. Furthermore, the caffeine-induced shift in AO monomer-dimer equilibrium is attributed to the binding of caffeine with AO monomer, and the binding constant was higher at a low pH range (pH ?2) compared to pH ?7, which results in superior caffeine sensitivity at pH ?2. Finally, caffeine content in commercial tea beverages has been evaluated and compared with the value obtained with a standard HPLC method. PMID:23544959

Ghosh, Amit K; Ghosh, Chandrasekhar; Gupta, Ashutosh

2013-04-10

450

Ultrasonographic measurement of kidney-to-aorta ratio as a method of estimating renal size in dogs.  

PubMed

Renal size is an important parameter in the assessment of renal disease in dogs. However, because of the great variability in body conformation, absolute renal measurements cannot solely be used when evaluating kidneys with ultrasonography. The use of a ratio comparing renal length and aortic luminal diameter (K/Ao) was investigated. After confirming the reproducibility of these measurements, K/Ao ratios were obtained in 92 dogs without clinical evidence of renal disease. Left and right K/Ao ratios were statistically similar. Based on 95% confidence intervals, renal size should be considered reduced if the K/Ao ratio is < 5.5 and increased when > 9.1. PMID:17899978

Mareschal, Augustin; d'Anjou, Marc-André; Moreau, Maxim; Alexander, Kate; Beauregard, Guy

451

Aorta Measurements are Heritable and Influenced by Bicuspid Aortic Valve  

PubMed Central

Objectives: To determine whether the contributions of genetics and bicuspid aortic valve (BAV) independently influence aortic (Ao) dimensions. Background: Ao dilation is a risk factor for aneurysm, dissection, and sudden cardiac death. Frequent association of BAV with Ao dilation implicates a common underlying defect possibly due to genetic factors. Methods: Families enriched for BAV underwent standardized transthoracic echocardiography. In addition to BAV status, echocardiographic measures of Ao (annulus to descending Ao), pulmonary artery, and mitral valve annulus (MVA) diameters were obtained. Using variance components analysis, heritability was estimated with and without BAV status. Additionally, bivariate genetic analyses between Ao dimensions and BAV were performed. Results: Our cohort was obtained from 209 families enriched for BAV. After adjusting for age, body surface area, and sex, individuals with BAV had a statistically significant increase in all echocardiographic measurements (p?Ao and MVA. Individuals with BAV were at greater odds of having Ao dilation (OR?=?4.44, 95% CI 2.93–6.72) than family members without BAV. All echocardiographic measurements exhibited moderate to strong heritability (0.25–0.53), and these estimates were not influenced by inclusion of BAV as a covariate. Bivariate genetic analyses supported that the genetic correlation between BAV and echo measures were not significantly different from zero. Conclusion: We show for the first time that echocardiographic measurements of Ao, pulmonary artery and MVA diameters are quantitative traits that exhibit significant heritability. In addition, our results suggest the presence of BAV independently influences the proximal Ao and pulmonary artery measures but not those in the descending Ao or MVA.

Martin, Lisa J.; Hinton, Robert B.; Zhang, Xue; Cripe, Linda H.; Benson, D. Woodrow

2011-01-01

452

Anomalous precipitation signatures of the Arctic Oscillation in the time-variable gravity field by GRACE  

NASA Astrophysics Data System (ADS)

The Arctic Oscillation (AO) controls winter climates in the Northern Hemisphere to a large extent. Positive AO brings lower/higher surface temperature and higher/lower precipitation in high/middle latitude regions, and negative AO reverses the situation. In this study, we investigate signals of anomalous precipitations caused by AO using the data of the Gravity Recovery and Climate Experiment (GRACE) satellites. Wintertime mass deviations inferred from GRACE in the high and middle (boundary ˜55N) latitude regions in Eurasia showed highly positive and negative correlations with the AO indices. This possibly reflects the northward and southward shift of the centre of winter precipitation during the positive and negative phases of AO, respectively. Wintertime mass deviations also showed positive and negative correlations with the AO indices in the northern and southern parts of Greenland, respectively, but the boundary was further to the north, say ˜75N. AO redistributes the water mass as much as ˜1000 Gt between high and middle latitude regions in the Northern Hemisphere. Such mass redistribution causes significant surface deformation by loading large enough to be observed by Global Positioning System. This also causes the shift of the Earth's rotation axis especially towards the Greenwich Meridian large enough to be detected with space geodetic techniques. AO signatures are also derived from the empirical orthogonal function (EOF) analysis, as the first leading mode of GRACE data after excluding seasonal, linear and quadratic components. The EOF analysis also demonstrates that though AO is a main contributor to bring anomalous winter precipitation in the Northern Hemisphere as a whole, in North America, however, influence of the El Niño and Southern Oscillation on the winter precipitation anomaly is larger than AO.

Matsuo, Koji; Heki, Kosuke

2012-09-01

453

Acridine orange as a biosensitive photovoltaic material  

NASA Astrophysics Data System (ADS)

Acridine orange (AO), a biosensitive molecule that is customarily used for labeling nucleic acids including DNA and RNA, is here investigated as a cost effective, water soluble, and photoactive material for the fabrication of potentially biosensitive organic photovoltaics. The electronic energy levels of AO are determined using Kelvin Probe Force Microscopy (KPFM) and UV-Visible spectroscopy. The effect of anticrystallization agents, as well as low-temperature annealing, on the work function of AO is investigated: amorphous AO films are shown to possess a significantly higher work function than microcrystalline AO films and the work function also increases by annealing. Photo-induced processes in AO films are investigated by considering the changes of the KPFM signal under illumination. We demonstrate that acridine orange is able to photogenerate electron-hole pairs at rates comparable to the most commonly used solar-grade photovoltaic materials, including polythiophenes. In addition, the effect of the morphology of different types of AO thin films spun from different solvents is studied in bilayer photovoltaic devices fabricated from stacks of AO and phenyl-C61-butyric acid methyl ester thin films.

Sharifi, Faranak; Bauld, Reg; Fanchini, Giovanni

2013-10-01

454

Manutenção da independência em idosos saudáveis: fórmula para um envelhecimento bem sucedido  

Microsoft Academic Search

1 realizou um interessante estudo na cidade de São Paulo que avaliou a expectativa de vida de homens e mulheres e os anos vividos com e sem incapacidade funcional. Ele chegou à conclusão que apesar da expectativa de vida das mulheres ser superior ao dos homens, elas apresentam maior proporção de anos vividos com incapacidade funcional. Chegar aos 90 anos,

Camargos MCS