A 32-year-old man presented with a floater in his right eye of 1-day duration. Examination revealed visual acuity 20/20 2 disc-diameter, pigmented, translucent, freely floating, oval cystic lesion the midvitreous (Fig A, inset showing magnified view). Ultrasonography highlighted nature an anechoic center and hyperechoic borders B) OCT well-defined hyperreflective structure hyporeflective lumen ...

Local adaptation frequently occurs across populations as a result of migration-selection balance between divergent selective pressures and gene flow associated with life in heterogeneous landscapes. Studying the effects of selection and gene flow on the adaptation process can be achieved in systems that have recently colonized extreme environments. This study utilizes an endemic South American ...

OBJECTIVE To use intravascular ultrasound (IVUS) to compare plaque morphology in acute myocardial infarction and stable angina pectoris. DESIGN Retrospective study. SETTING Primary care hospital. PATIENTS 59 consecutive cases of acute myocardial infarction and 50 consecutive cases of stable angina pectoris. METHODS IVUS was used before coronary intervention. MAIN OUTCOME MEASURES Plaq...

One of the major factors plaguing the performance of synthetic aperture radar (SAR) imagery is the presence of signal-dependent speckle noise. Grainy in appearance, speckle noise is primarily due to the phase fluctuations of the electromagnetic return signals. Since inherent spatial-correlation characteristics of speckle in SAR images are not exploited in existing multiplicative models for spec...

This thesis proposes a non-parametri te hnique for boundary dete tion in spe kled imagery. Syntheti Aperture Radar (SAR), sonar, B-ultrasound and laser imagery is orrupted by a signal-dependent non-additive noise alled spe kle. Several statisti al models have been proposed to des ribe su h a noise, thus of spe ialized te hniques for image improvement and analysis. The G distribution is a statis...

This paper tackles the problem of estimating the parameters of relevant distributions that describe speckled imagery. Speckle noise appears in data obtained with coherent illumination, as is the case of sonar, laser, ultrasound-B and synthetic aperture radar images. This noise is non-Gaussian and non-additive and, therefore, classical techniques of processing and analysis may fail. A universal ...

The major-histocompatibility-complex protein UAP56 (BAT1) is a DEAD-box helicase that is deposited on mRNA during splicing. UAP56 is retained on spliced mRNA in an exon junction complex (EJC) or, alternatively, with the TREX complex at the 5' end, where it might facilitate the export of the spliced mRNA to the cytoplasm. Using confocal microscopy, UAP56 was found to be concentrated in RNA-splic...