97 research outputs found
BORIS/CTCFL is an RNA-binding protein that associates with polysomes
© 2013 Ogunkolade et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the
Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is properly cited
Multifrequency behaviour of the anomalous events of PSR J0922+0638
PSR J0922+0638 (B0919+06) shows unexplained anomalous variations in the
on-pulse phase, where the pulse appears to episodically move to an earlier
longitude for a few tens of rotations before reverting to the usual phase for
approximately several hundred to more than a thousand rotations. These events,
where the pulse moves in phase by up to 5, have been previously
detected in observations from 300 to 2000 MHz. We present simultaneous
observations from the Effelsberg 100-m radio telescope at 1350 MHz and the
Bornim (Potsdam) station of the LOw Frequency ARray at 150 MHz. Our
observations present the first evidence for an absence of the anomalous
phase-shifting behaviour at 150 MHz. Instead, the observed intensity at the
usual pulse-phase typically decreases, often showing a pseudo-nulling feature
corresponding to the times when phase shifts are observed at 1350 MHz. The
presence of weak emission at the usual pulse-phase supports the theory that
these shifts may result from processes similar to the 'profile-absorption'
expected to operate for PSR J0814+7429 (B0809+74). A possible mechanism for
this could be intrinsic variations of the emission within the pulsar's beam
combined with absorption by expanding shells of electrons in the line of sight.Comment: 5 pages, 3 figures, accepted for publication in MNRAS Letter
Optimal fluoroscopic viewing angles for stenting of the coronary aorto-ostial lesions
Background: Long-term results after stenting aorto-coronary ostial lesions (AOL) are worse than those achieved in non-ostial locations. AOL interventions still pose a substantial challenge for interventional cardiologists. The aim of the study was to determine the optimal fluoroscopic viewing angles of the left and right coronary ostia, based on multislice computed tomography (MSCT) data.Methods: Cardiac MSCT exams of 30 patients with clinical suspicion of coronary artery disease were analyzed. En face angles of both coronary ostia, as well as their optimal projection curves, were determined by 2 independent observers in a standard Dicom viewer, without any additional, specialized software add-ons, using a systematic, step-by-step approach. Spatial relations between the ostial plane and the aorta were also assessed.Results: The average en face angle of the left coronary ostium was RAO 23°, CAU 45°; for the right coronary ostium RAO 18°, CRA 5°. The mean inter-observer differences for the en face angles of the left and right coronary arteries were 5° and 7°, respectively.Conclusions: Multislice computed tomography data provide precise spatial information on the orientation of the coronary ostia and their relation to the aortic root. Their utilization for determining the patient-specific viewing angle may substantially facilitate percutaneous coronary interventions in AOL
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