The 100 Most-Cited Articles Focused on Ultrasound Imaging: A Bibliometric Analysis.

Purpose The number of citations that an article has received reflects its impact on a particular research area. The aim of this study was to identify the 100 most-cited articles focused on ultrasound (US) imaging and to analyze the characteristics of these articles. Methods We determined the 100 most-cited articles on US imaging via the Web of Science database, using the search term. The following parameters were used to analyze the characteristics of the 100 most-cited articles: publication year, journal, journal impact factor, number of citations and annual citations, authors, department, institution, country, type of article, and topic. Results The number of citations for the 100 most-cited articles ranged from 1849 to 341 (median: 442.0) and the number of annual citations ranged from 108.0 to 8.1 (median: 22.1). The majority of articles were published in 1990 - 1999 (39 %), published in radiology journals (20 %), originated in the United States (45 %), were clinical observation studies (67 %), and dealt with the vessels (35 %). The Department of Internal Medicine at the University of California and the Research Institute of Public Health at the University of Kuopio (n = 4 each) were the leading institutions and Salonen JT and Salonen R (n = 4 each) were the most prolific authors. Conclusion Our study presents a detailed list and analysis of the 100 most-cited US articles, which provides a unique insight into the historical development in this field.

Superconducting properties of hole doped Ba(0.6)Li(0.4)Fe2As2 single crystal.

We report the emergence of superconductivity in Li doped Ba-122 single crystals grown by the Bridgman method. The superconducting transition temperature Tc,onset is around 19 K. The specific heat capacity C/T shows a weak anomaly near Tc. The value of ΔC/γnTc is smaller than the value predicted in BCS theory indicating a multigap nature of the sample. The magnetic measurements show that the lower critical field Hc1(T) exhibits a linear temperature dependence, with a pronounced change of the Hc1(T) curvature around 0.4Tc and Hc1(0) ≈ 430 Oe in the Ba0.6Li0.4Fe2As2 single crystal. Furthermore, temperature dependence of the penetration depth λ(T) follows a power law (~T(n)) below 0.4Tc which predicts possible S±-wave pairing in a Ba0.6Li0.4Fe2As2 superconductor. Over a wide range of temperatures, the Jc(H) exhibits a relation J(c)[proportionality] H(-α) with α = 0.5 ~ 0.6 for H || c and H || ab which indicates random defects in the sample. We found that the temperature dependence of the critical current density Jc(T) can be fitted well with the δl-type pinning model, whose origin is attributed to spatial variations of charge carrier mean free path l. We suggest that the large mismatch in the ionic radius of Ba and Li can affect the irreversible magnetic properties of the Ba0.6Li0.4Fe2As2 single crystal without any structural transition.

Benign breast diseases associated with cyclosporine therapy in renal transplant recipients.

PURPOSE: Our aim was to correlate the radiologic characteristics of cyclosporine-induced benign breast diseases with clinical and pathologic findings. MATERIALS AND METHODS: The clinical, mammographic, and ultrasonographic records of 33 female renal transplant recipients who received cyclosporine were retrospectively reviewed. Eleven patients had 46 breast masses on ultrasonography. We performed core needle biopsies on 20 masses and reviewed the pathologic findings. RESULTS: Among 33 female renal transplant recipients, 11 (33%) had 46 benign breast lesions detected on ultrasonography. We performed core needle biopsies on 20 of the 46 masses. On pathologic examination, 12 were fibroadenomas, 6 showed fibrocystic changes, and 2 revealed dense fibrosis. Regardless of the final pathologic diagnosis, more than half of the lesions revealed severe lymphatic and venular swellings. Among 11 patients with breast lesions on ultrasonography, 10/11 (91%) showed multiplicity, and 7/11 (64%) bilaterality. Mammographically, patients with breast lesions revealed heterogeneous or extremely dense breast patterns, and 8 of 11 patients, circumscribed masses. Twenty-two patients without breast lesions showed scattered fibroglandular densities (n = 7), or heterogeneously dense (n = 11) or extremely dense (n = 4) breast patterns, and 3 of 22 patients showed vague or asymmetric densities that needed further evaluation. CONCLUSION: The development of new breast lesions in patients after renal transplantation should suggest a diagnosis of cyclosporine-induced benign breast disease including fibroadenoma, fibrocystic changes, and dense fibrosis.

p53 gene mutation is rare in human cervical carcinomas with positive HPV sequences.

Chromosome 17p allelic losses and concurrent p53 mutations have been demonstrated in various human cancers. We therefore investigated the presence of chromosome 17p allelic loss and possible concurrent p53 mutation in 29 Korean cases of cervical carcinoma by restriction fragment length polymorphism (RFLP) analysis and polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) over the region from exon 4 to exon 9 of the p53 gene. We also examined the expression of p53 in paraffin tissues by immunohistochemical staining and determined the incidence of human papillomavirus (HPV) sequences in the same tissues by multitype PCR analysis to correlate them to the allelic loss on chromosome 17p13 and p53 mutation. In the analysis of 29 cases, loss of heterozygosity (LOH) was observed in eight (40%) cases out of 20 informative cases and p53 mutation was observed in only one case (3.4%) at exon 5. So in the majority of cases with LOH on 17p in this series, mutation of p53 gene appeared to be rare. But we obtained three cases (10.3%) of positive immunoreactivity from 29 cases. Those cases may carry mutations outside of the regions examined by PCR-SSCP. HPV DNA was detected in 27 of 29 cases (93.1%). HPV types 8, 11, 16, and 18 were detected in the samples we tested, while only two (7.4%) out of 27 HPV positive cases exhibited overexpression for p53 without any demonstrable p53 mutation upon PCR-SSCP. These results suggest that HPV infection may play a role in inactivating wild-type p53 protein in cervical carcinomas. In conclusion, mutation and overexpression of p53 gene appear to be rare, particularly in cases of cervical carcinoma associated with positive HPV sequence.