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21.
Elma J. Gussenhoven Meindert A. Taams Jos Roelandt Klaas Bom Jan Honkoop Nico de Jong Kees M. Ligtvoet 《The International Journal of Cardiac Imaging》1987,2(4):231-239
Summary The diagnostic value of oesophageal echocardiography is most striking in patients in whom precordial studies are of inadequate quality or fail to establish a definitive diagnosis. Oesophageal studies have excellent image quality, can be completed within 10 minutes without complications and, in most instances, enables the clinical question to be answered. In 50 patients referred for suspected thoracic aorta pathology, oesophageal echocardiography correctly excluded or diagnosed the type of aortic dissection, aortic aneurysm or the site of coarctation. Of 35 patients referred with suspected infective endocarditis, oesophageal echocardiography revealed complications in 18 patients, including vegetation, mycotic aneurysm, abscess or chordal rupture. Oesophageal echocardiography is extremely helpful to visualize intracardiac mass lesions. In 27 patients with a history of systemic or pulmonary embolism, the technique confirmed the presence, size and position of a mass lesion in 11 patients. Oesophageal color Doppler flow imaging further expands the diagnostic capabilities, particularly in patients with mitral valve prosthesis. Our experience indicates that oesophageal echocardiography significantly extends the diagnostic potential of echocardiography. Detailed knowledge of cardiothoracic anatomy and its pathologic sequelae is, however, a prerequisite for the efficient and safe application of this method. 相似文献
22.
Brandon N. Nicolay Paul S. Danielian Filippos Kottakis John D. Lapek Jr Ioannis Sanidas Wayne O. Miles Mantre Dehnad Katrin Tsch?p Jessica J. Gierut Amity L. Manning Robert Morris Kevin Haigis Nabeel Bardeesy Jacqueline A. Lees Wilhelm Haas Nicholas J. Dyson 《Genes & development》2015,29(17):1875-1889
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Simillion C Vandepoele K Van Montagu MC Zabeau M Van de Peer Y 《Proceedings of the National Academy of Sciences of the United States of America》2002,99(21):13627-13632
Analysis of the genome sequence of Arabidopsis thaliana shows that this genome, like that of many other eukaryotic organisms, has undergone large-scale gene duplications or even duplications of the entire genome. However, the high frequency of gene loss after duplication events reduces colinearity and therefore the chance of finding duplicated regions that, at the extreme, no longer share homologous genes. In this study we show that heavily degenerated block duplications that can no longer be recognized by directly comparing two segments because of differential gene loss, can still be detected through indirect comparison with other segments. When these so-called hidden duplications in Arabidopsis are taken into account, many homologous genomic regions can be found in five to eight copies. This finding strongly implies that Arabidopsis has undergone three, but probably no more, rounds of genome duplications. Therefore, adding such hidden blocks to the duplication landscape of Arabidopsis sheds light on the number of polyploidy events that this model plant genome has undergone in its evolutionary past. 相似文献
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Esther G. Gerrits Helen L. Lutgers Nanne Kleefstra Klaas H. Groenier Andries J. Smit Rijk O. B. Gans Henk J. G. Bilo 《Journal of diabetes science and technology》2008,2(4):572-577