169,885 research outputs found
El arco-puerta romana conmemorativa de Gerunda (Girona)
No full textThe present work deals with the interpretation of 15 disiecta membra lapides in marble assigned to be part of an arcuated honorific Roman monument of Gerunda (Girona). Most of these blocks were reused during the Carolingian period as building material for the basement of a tower of the city wall. The study proposes an architectural restitution of the monument as well as a chronological and functional (location) of it.El presente trabajo trata sobre la interpretación de 15 disiecta membra lapídeos marmóreos adscribibles a formar parte de un monumento arcuado honorífico romano de Gerunda (Girona). La mayoría de estos bloques fueron reaprovechados en época carolingia como material constructivo del basamento de una torre del recinto úrbico. El estudio elabora tanto una propuesta de restitución arquitectónica del monumento como una propuesta cronológica y funcional (emplazamiento) del mismo
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Grabbing Yeast iso-1-cytochrome c by Cys102: an effective approach for the assembly of functionally active metalloprotein carpets
No full textWe report an approach for immobilizing iso-l-cytochrome c from Saccharomyces cerevisiae on oxygen exposing surfaces derivatized with SH-terminated silanes. The SH moieties from silanes have been brought to react with the partially buried Cys102, forming an intermolecular disulfide bond which anchored covalently cytochrome c to the surface. The presence of a single cysteine residue on the protein surface imparted a well-defined orientation to the molecular edifice. Molecular constructs obtained with native cytochrome c and with a cysteine-depleted mutant (C102T) have been investigated by means of scanning force microscopy under liquid, which was performed to assay the quality of the molecular carpet, showing that the native protein formed a robust monolayer at the surface, whereas only a negligible amount of physisorbed molecules were detected in the case of a mutant. UV-vis absorption spectroscopy was performed to confirm that immobilization takes place via the Cys102 residue. Linear sweep voltammetric measurements showed retention of the redox activity of the covalently immobilized cytochrome c, confirming the viability of the proposed immobilization method for obtaining monolayers of redox active molecules
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Feasibility of baroreflex sensitivity measurementby sequence method in patients with vasovagal syncope
No full textSENTINEL NODE IN DIFFERENTIATED THYROID CANCER: COMPARISON BETWEEN VITAL-DYE PATENT BLUE, LYMPHOSCINTIGRAPHY AND COMBINED TECHNIQUE
No full textObiettivo dello studio : aim of the study is to evaluate the role of sentinel node (SN) identification in the treatment of differentiated thyroid cancer (DTC). We also aim to assess feasibility and reproducibility of the SN techniques with vital-dye patent blue, radiotracer and combined technique
Materiali e metodi : the study is multicentric, prospective, randomized three arms open. We expect to enroll 120 patients in 2 years. Patients have to be preoperative diagnosis of DTC. Exclusion criteria are previous cervical surgery, medullary cancer, nodes metastasis and multifocal tumor. All patients undergo total thyroidectomy, SN identification and central compartment (CC) dissection: in Arm A SN identification is obtained with vital-dye Patent blue technique, in Arm B with lymphoscintigraphy and in Arm C with combined technique. Specimen histopathology provides information about the characteristics of primary tumor, SN and the remaining nodes with specific immuno-histochemistry protocols
Principali risultati : so far we enrolled 42 patients Arm A (26 pts): 18 patients (69.2%) had negative SN and nonSN; 1 (3.8%) with negative SN had micrometastasis in 2 nodes of CC; 2 (7.6%) with macrometastasis in the SN had metastatic nodes in the CC and 1 (3.8%) had macrometastasis in the SN with no other positive nodes. In 4 (15.2%) patients identification of the SN wasn't possible and there was no evidence of metastasis in all nodes removed Arm B: 2 patients (100%) had negative SN and nonSN Arm C (14 pts): 4 patients (28.6%) had negative SN and nonSN; 1 (7.1%) with negative SN had macrometastasis in 2 nodes; 4 (28.6%) with macrometastasis in the SN had metastatic nodes in the CC and 1 (7.1%) had macrometastasis in the SN with no other positive nodes. In 4 (28.6%) patients identification of the SN wasn't possible and in 3 of them there was no evidence of metastasis
Conclusioni : so far the data we gathered are too few to make statistic significant conclusions. Once adequate scientific evidence is available, detection of the SN could become a routine procedure in DTC treatment, avoiding central compartment dissection in patients with negative SN. The achievement of a standard protocol of SN detection remains an important issue to solve, although both techniques had shown a good rate of detection of the SN, several studies report that the combined method could reduce false negatives and increase detection rates of SN metastase
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Long term persistence of low bone density in orthotopic liver transplantation
No full textWe determined bone density and metabolism in 46 patients (35 males, 11 females) who had undergone liver transplantation 1-48 months previously. Twenty-one patients were then followed for the next 24 months. At each visit, blood and urine samples for bone and liver metabolism parameters, as well as spinal and femoral dual-energy X-ray absorptiometry (DXA) scans, were obtained. Basal spinal and femoral density was low (p < 0.001). Patients with pre-transplant cholestatic diseases had lower spinal density than all the other subjects (p <0.05) and the cumulative methylprednisolone intake was an independent negative predictor of total hip density (p < 0.02). At baseline, urinary hydroxyproline and N-telopeptide were at the upper normal level and decreased only after 24 months of follow-up (p < 0.05). During the first year of follow-up, femoral density decreased (p < 0.05) and a partial recovery was observed for both spine and femur after 24 months. After 12 months, femoral bone density was negatively associated with serum cyclosporin A levels (p < 0.005) and cumulative methylprednisolone intake (p < 0.05), while the percent decrease in spinal density after the first 12 months was negatively predicted by mean daily methylprednisolone intake (p < 0.05). In patients with pre-transplant cholestatic diseases, femoral and spinal density increased after the first (p < 0.05) and second year (p < 0.05), respectively. In patients with previous post-necrotic cirrhosis, femoral density decreased after 12 months (p<0.05) and was still lower than baseline after 24 months (p < 0.05). However, at the end of the study the cumulative percentage of femoral neck osteoporosis was 43%. In conclusion, an elevated prevalence of spinal and femoral osteoporosis is present even many years after liver transplantation, with immunosuppressive treatment and pre-transplant liver disease being the most important pathogenetic factors
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