101
|
Aguilera P, Carrera C, Puig-Butille JA, Badenas C, Lecha M, González S, Malvehy J, Puig S. Benefits of oral Polypodium Leucotomos extract in MM high-risk patients. J Eur Acad Dermatol Venereol 2012; 27:1095-100. [PMID: 22849563 DOI: 10.1111/j.1468-3083.2012.04659.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND UV radiation and the presence of melanocytic nevi are the main risk factors of sporadic melanoma (MM). Protection of skin by an oral photoprotective agent would have substantial benefits. OBJECTIVE We investigated the possible role of an oral Polypodium leucotomos (PL) extract to improve systemic photoprotection in patients at risk of skin cancer analyzing the ability to decrease UV-induced erythema. We also studied the interaction among MC1R polymorphisms and CDKN2A status with the minimal erythematous dose (MED) and their influence in the response after oral PL. METHODS A total of 61 patients (25 with familial and/or multiple MM, 20 with sporadic MM and 16 with atypical mole syndrome without history of MM) were exposed to varying doses of artificial UVB radiation without and after oral administration of a total dose of 1080 mg of PL. RESULTS Oral PL treatment significantly increased the MED mean in all group patients (0.123 to 0.161 J/cm(2) , p<0.05). Although not significant, we noticed a stronger effect of PL on the MED of patients with familial MM compared to those with MM (U=273, p=0.06). Among the patients with familial MM, those exhibiting a mutated CDKN2A and/or polymorphisms in MC1R had the bigger differences in response to treatment with PL. LIMITATIONS Reduced number of patients. No control population. CONCLUSIONS Administration of PL leads to a significant reduction of sensitivity to UVR (p<0.05) in all patients. Dark-eye patients and patients with higher UVR sensibility (lower basal MED) would be the most benefited from oral PL treatment.
Collapse
|
102
|
García Fernández A, Giménez N, Fraile M, González S, Chabrera C, Torras M, González C, Salas A, Barco I, Cirera L, Cambra M, Veloso E, Pessarrodona A. Survival and clinicopathological characteristics of breast cancer patient according to different tumour subtypes as determined by hormone receptor and Her2 immunohistochemistry. A single institution survey spanning 1998 to 2010. Breast 2012; 21:366-73. [DOI: 10.1016/j.breast.2012.03.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Revised: 03/06/2012] [Accepted: 03/13/2012] [Indexed: 11/30/2022] Open
|
103
|
Fajardo CA, González S, Zambosco G, Cancela MJ, Forero LV, Venegas M, Baquero H, Lemus-Varela L, Kattan J, Wormald F, Sola A, Lantos J. End of life, death and dying in neonatal intensive care units in Latin America. Acta Paediatr 2012; 101:609-13. [PMID: 22536812 DOI: 10.1111/j.1651-2227.2012.02596.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM Most analyses of end of life decisions in Neonatal Intensive Care Units (NICUs) have come from Europe/English-speaking countries. Would decisions be different in Latin American NICUs? Therefore, we aim to evaluate the approach to dying infants/families in NICUs in Latin America. METHODS Multinational descriptive study of all deaths in babies born at >22 weeks in eight NICUs in five Latin American countries. Deaths were categorized as: (i) no Cardiopulmonary Resuscitation (CPR) or life support offered; (ii) life support initiated but do not resuscitate (DNR) orders written or no CPR provided; (iii) full life support and CPR; and (iv) unclassifiable. RESULTS There were 100 deaths, 81% in >27 weeks. Seventeen infants received no CPR/life support at birth, 10 died in DR and seven in NICU. There were 27 infants in group 2, 54 in group three and two in group 4. No baby had care withdrawn or care withdrawn/CPR withheld. Thirty-two infants had 'do not resuscitate' order. Decisions without parents' involvement in 15%, both parents present at death 24% and sedatives/narcotics documented 14%. CONCLUSIONS Latin American NICUs differ from those in Northern Europe/English-speaking countries. More deaths are accompanied by full life support and CPR. DNR orders are rare. Withdrawal of life support is virtually non-existent. Latin American's doctors are more likely to make decisions without the objections of family about withholding life-sustaining treatment.
Collapse
|
104
|
Feltes N, Alvarado-Astudillo A, Mur E, González J, González S, Gallardo E, Macia M, Pardo J, Solé J. EP-1029 SURVIVAL AND PROGNOSTIC FACTORS IN GLIOBLASTOMA MULTIFORME. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71362-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
105
|
González S, Pellicer E, Fornell J, Blanquer A, Barrios L, Ibáñez E, Solsona P, Suriñach S, Baró M, Nogués C, Sort J. Improved mechanical performance and delayed corrosion phenomena in biodegradable Mg–Zn–Ca alloys through Pd-alloying. J Mech Behav Biomed Mater 2012; 6:53-62. [DOI: 10.1016/j.jmbbm.2011.09.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 09/23/2011] [Accepted: 09/25/2011] [Indexed: 10/15/2022]
|
106
|
Hernández Z, González S. Parasitological survey of the Uruguayan populations of wild Pampas deer (Ozotoceros bezoarticus L. 1758). ANIMAL PRODUCTION SCIENCE 2012. [DOI: 10.1071/an11358] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The pampas deer (Ozotoceros bezoarticus) is one of the most endangered neotropical mammals in Uruguay. Although it has a wide geographic distribution in south-eastern South America (from 5°S to 41°S), the habitat required by this species has been greatly reduced by agriculture and urbanisation. The species decline was due to human activities, and currently two isolated populations survive. The parasitological load is a good indicator of the health of the species and the ecosystem. The objective of the present study was to survey and determine the parasitological composition of the two Uruguayan pampas deer populations. We quantified the coproparasite load, by analysing the effect of seasonality through the year, the micro-ecosystem environment, the topography and also the livestock of the paddock. The taxonomic assessment was based on adult individuals obtained from the post mortem necropsy examination in individuals found dead in the field. The genera of the endoparasites recorded through the morphological eggs, larvae and/or adults were Trichuris, Capillaria, Strongyloides, Fasciola, Paramphistomum, Moniezia, Haemonchus, Ostertagia, Trichostrongylus, Oesophagostomum and Coccidias ooquiste. Our results showed that the parasitological community in the pampas deer is strongly correlated with the environmental conditions, topology, micro-ecosystem and the land use, as well as the effect of the livestock load. Moreover, because we have diagnosed the same genera of helminths in domestic ruminants, we recommend balancing the carrying capacities of the field paddocks, and performing periodical surveys of the livestock parasite load that will be helpful in maintaining control at lower values.
Collapse
|
107
|
Cruz MCIDL, Sanz-Rodríguez F, Zamarrón A, Reyes E, Carrasco E, González S, Juarranz A. A secretion of the mollusc Cryptomphalus aspersa promotes proliferation, migration and survival of keratinocytes and dermal fibroblasts in vitro. Int J Cosmet Sci 2011; 34:183-9. [PMID: 22171745 DOI: 10.1111/j.1468-2494.2011.00699.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Regenerative properties of skin decrease with age, and thus, the search for substances that minimize cutaneous ageing has increased in the last few years. The secretion of the mollusc Cryptomphalus Aspersa (SCA) is a natural product that bears regenerative properties when applied topically. The purpose of this work is to study the in vitro effects of SCA on cell proliferation and migration, as well as on cell-cell (E-cadherin and β-catenin) and cell-substrate (vinculin and β1-integrin) adhesion proteins expression, using a human keratinocyte cell line (HaCaT cells) and primary dermal fibroblasts (HF). We tested the effects of SCA on cell proliferation using a colorimetric assay. In addition, SCA-induced changes on cell migration were studied by wound-healing assays. Besides, Western blot and immunofluorescence microscopy were carried out to test the expression of different cell adhesion proteins. We found that SCA promotes proliferation and migration of HaCaT cells in a time- and dose-dependent manner. Moreover, treatment with SCA increases the migratory behaviour and the expression of adhesion molecules in both HaCaT and HF. Finally, SCA also improves cell survival and promotes phosphorylation of FAK and nuclear localization of β-catenin. These results shed light on the molecular mechanisms underlying the regenerative properties of SCA, based on its promoting effect on skin cell migration, proliferation and survival. Moreover, these results support future clinical uses of SCA in the regeneration of wounded tissues.
Collapse
|
108
|
Crosby MM, Mendoza GD, Bárcena R, González S, Aranda E. Influence ofSaccharomyces cerevisiaeDose on Ruminal Fermentation and Digestion in Sheep Fed a Corn Stover Diet. JOURNAL OF APPLIED ANIMAL RESEARCH 2011. [DOI: 10.1080/09712119.2004.9706465] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
|
109
|
Ulrich M, Kanitakis J, González S, Lange-Asschenfeldt S, Stockfleth E, Roewert-Huber J. Evaluation of Bowen disease by in vivo reflectance confocal microscopy. Br J Dermatol 2011; 166:451-3. [DOI: 10.1111/j.1365-2133.2011.10563.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
110
|
Souto R, Santana J, Fernández-Mérida L, González S. Sensing electrochemical activity in polymer coated metals during the early stages of coating degradation–Effect of the polarization of the substrate. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.03.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
111
|
Fagundo E, Rodríguez-García C, Rodríguez C, González S, Sánchez R, Jiménez A. Estudio de las características fenotípicas y exposición a radiación ultravioleta en pacientes diagnosticados de melanoma cutáneo. ACTAS DERMO-SIFILIOGRAFICAS 2011; 102:599-604. [DOI: 10.1016/j.ad.2011.03.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 02/28/2011] [Accepted: 03/06/2011] [Indexed: 11/26/2022] Open
|
112
|
Moscarella E, González S, Agozzino M, Sánchez-Mateos J, Panetta C, Contaldo M, Ardigò M. Pilot study on reflectance confocal microscopy imaging of lichen planus: a real-time, non-invasive aid for clinical diagnosis. J Eur Acad Dermatol Venereol 2011; 26:1258-65. [DOI: 10.1111/j.1468-3083.2011.04279.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
113
|
Ulrich M, González S, Lange-Asschenfeldt B, Roewert-Huber J, Sterry W, Stockfleth E, Astner S. Non-invasive diagnosis and monitoring of actinic cheilitis with reflectance confocal microscopy. J Eur Acad Dermatol Venereol 2011; 25:276-84. [PMID: 20626536 DOI: 10.1111/j.1468-3083.2010.03777.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Actinic cheilitis (AC) represents the equivalent of actinic keratosis on the lip. Various treatment modalities are available and the efficacy of diclofenac in hyaluronic acid has recently been described. Reflectance confocal microscopy (RCM) is a non-invasive imaging technique which has recently been applied for the diagnosis of actinic keratoses. Herein, we describe the applicability of RCM for the diagnosis of AC and for monitoring of treatment response of AC to diclofenac in hyaluronic acid. METHODS Ten Caucasian patients with clinical suspicion for AC were included in this study. To obtain a non-invasive diagnosis, RCM was performed at baseline, followed by biopsy and respective confocal-histopathological correlation. Six patients with a histological diagnosis of AC were treated with diclofenac in hyaluronic acid, whereby monitoring was performed by RCM. RESULTS Reflectance confocal microscopy was able to correctly identify 6/7 cases of AC and 3/3 cases of benign lesions. The most important RCM criteria for diagnosis of AC were cellular atypia at the stratum spinosum and granulosum with atypical honeycomb pattern. One patient with AC was misclassified as inflammatory cheilitis by RCM as it showed marked inflammatory response and lacked clear signs of cellular atypia on RCM imaging. Following topical treatment with diclofenac gel, 5/6 patients (83%) showed a good treatment response with regression of dysplasia on consecutive RCM examination. CONCLUSIONS Reflectance confocal microscopy is a promising tool for the non-invasive diagnosis and monitoring of actinic cheilitis. However, marked inflammation represents a potential diagnostic pitfall. In this regard, biopsy should be performed in doubtful cases.
Collapse
|
114
|
Galbarriatu L, Aurrecoechea J, Ruiz de Gopegui E, Pomposo I, Bilbao G, González S, Undabeitia J, Novo J, Aguirrebengoa K, Garibi J. Otolicuorrea espontánea en el adulto: Presentación de dos casos y revisión de la literatura. Neurocirugia (Astur) 2011. [DOI: 10.4321/s1130-14732011000200006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
115
|
Galbarriatu L, Aurrecoechea J, Ruiz de Gopegui E, Pomposo I, Bilbao G, González S, Undabeitia JI, Novo JJ, Aguirrebengoa K, Garibi JM. [Adult spontaneous cerebrospinal fluid otorrhea. Report of two cases and review of the literature]. Neurocirugia (Astur) 2011; 22:150-156. [PMID: 21597656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
INTRODUCTION Spontaneous cerebrospinal fluid otorrhea is a relatively rare entity and can be easily missed in adults. Every adult older than 50 years with a negative history of otologic disease who has recurrent serous otitis media should be evaluated for this pathology. Meningitis is the most serious complication, so there is no doubt that the condition needs immediate attention and correction. OBJECTIVE We present two patients who were diagnosed with spontaneous CSF otorrhea and make a review of what is reported about this topic. CONCLUSION Surgical repair is mandatory to seal these nontraumatic CSF leaks. There are two main surgical approaches, the middle fossa craniotomy and the transmastoid approach. A multilayered closure technique in which autologous and artificial materials are combined is considered to result in the highest rate of success.
Collapse
|
116
|
Caron A, Qin CL, Gu L, González S, Shluger A, Fecht HJ, Louzguine-Luzgin DV, Inoue A. Structure and nano-mechanical characteristics of surface oxide layers on a metallic glass. NANOTECHNOLOGY 2011; 22:095704. [PMID: 21270487 DOI: 10.1088/0957-4484/22/9/095704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Owing to their low elastic moduli, high specific strength and excellent processing characteristics in the undercooled liquid state, metallic glasses are promising materials for applications in micromechanical systems. With miniaturization of metallic mechanical components down to the micrometer scale, the importance of a native oxide layer on a glass surface is increasing. In this work we use TEM and XPS to characterize the structure and properties of the native oxide layer grown on Ni(62)Nb(38) metallic glass and their evolution after annealing in air. The thickness of the oxide layer almost doubled after annealing. In both cases the oxide layer is amorphous and consists predominantly of Nb oxide. We investigate the friction behavior at low loads and in ambient conditions (i.e. at T = 295 K and 60% air humidity) of both as-cast and annealed samples by friction force microscopy. After annealing the friction coefficient is found to have significantly increased. We attribute this effect to the increase of the mechanical stability of the oxide layer upon annealing.
Collapse
|
117
|
Galbarriatu L, Aurrecoechea J, Ruiz de Gopegui E, Pomposo I, Bilbao G, González S, Undabeitia J, Novo J, Aguirrebengoa K, Garibi J. Otolicuorrea espontánea en el adulto. Presentación de dos casos y revisión de la literatura. Neurocirugia (Astur) 2011. [DOI: 10.1016/s1130-1473(11)70013-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
118
|
García Fernández A, Fraile M, Giménez N, Reñe A, Torras M, Canales L, Torres J, Barco I, González S, Veloso E, González C, Cirera L, Pessarrodona A. Use of axillary ultrasound, ultrasound-fine needle aspiration biopsy and magnetic resonance imaging in the preoperative triage of breast cancer patients considered for sentinel node biopsy. ULTRASOUND IN MEDICINE & BIOLOGY 2011; 37:16-22. [PMID: 21144955 DOI: 10.1016/j.ultrasmedbio.2010.10.011] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 09/24/2010] [Accepted: 10/09/2010] [Indexed: 05/10/2023]
Abstract
We assessed the diagnostic yield of axillary ultrasound, alone or in combination with fine-needle aspiration axillary biopsy and magnetic resonance imaging in patients with invasive breast carcinoma compared with final axillary histology by sentinel node biopsy or by axillary lymph node dissection. From January 2003 to March 2009, 520 axillary ultrasound examinations and 105 axillary magnetic resonance imaging studies were included. Compared with final axillary histology, ultrasound fine-needle aspiration showed positive predictive value of 87%, negative predictive value of 82%, sensitivity of 53% and specificity of 100%. In cases of negative ultrasound, the rate of positive nodes was 17% (micro-metastases excluded). Ultrasound examination of the axilla, combined with fine-needle aspiration as appropriate must be included in the preoperative work-up of patients considered for sentinel node biopsy to definitively establish such an indication while minimizing the risk of false-negative sentinel node. Axillary magnetic resonance imaging did not improve the preoperative work-up.
Collapse
|
119
|
González S, Vega J, Murari A. Analysis of Video-Movies Using Support Vector Regression. FUSION SCIENCE AND TECHNOLOGY 2010. [DOI: 10.13182/fst10-a10925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
120
|
Rivera B, González S, Sánchez-Tomé E, Blanco I, Mercadillo F, Letón R, Benítez J, Robledo M, Capellá G, Urioste M. Clinical and genetic characterization of classical forms of familial adenomatous polyposis: a Spanish population study. Ann Oncol 2010; 22:903-909. [PMID: 20924072 DOI: 10.1093/annonc/mdq465] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Classical familial adenomatous polyposis (FAP) is characterized by the appearance of >100 colorectal adenomas. PATIENTS AND METHODS We screened the APC and MUTYH genes for mutations and evaluated the genotype-phenotype correlation in 136 Spanish classical FAP families. RESULTS APC/MUTYH mutations were detected in 107 families. Sixty-four distinct APC point mutations were detected in 95 families of which all were truncating mutations. A significant proportion (39.6%) had not been previously reported. Mutations were spread over the entire coding region and great rearrangements were identified in six families. Another six families exhibited biallelic MUTYH mutations. No APC or MUTYH mutations were detected in 29 families. These APC/MUTYH-negative families showed clinical differences with the APC-positive families. A poor correlation between phenotype and mutation site was observed. CONCLUSIONS Our results highlight that a broad approach in the genetic study must be considered for classical FAP due to involvement of both APC and MUTYH and the heterogeneous spectrum of APC mutations observed in this Spanish population. The scarcely consistent genotype-phenotype correlation does not allow making specific recommendations regarding screening and management. Differences observed in APC/MUTYH-negative families may reflect a genetic basis other than mutations in APC and MUTYH genes for FAP predisposition.
Collapse
|
121
|
Mota MI, Gadea MP, González S, González G, Pardo L, Sirok A, Rivas M, Algorta G, Schelotto F, Varela G. Bacterial pathogens associated with bloody diarrhea in Uruguayan children. Rev Argent Microbiol 2010; 42:114-7. [PMID: 20589332 DOI: 10.1590/s0325-75412010000200009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Accepted: 03/09/2010] [Indexed: 11/22/2022] Open
Abstract
Diarrheal disease continues to be a serious health problem, especially in developing countries. Bloody diarrhea represents approximately 20-30% of all cases and has higher morbidity and mortality. Treatment with antibiotics is beneficial in cases of Shigella, Campylobacter, Yersinia and Salmonella infection, principally in those children with a higher risk of invasive disease. The aims of this study were to detect the bacterial agents associated with bloody diarrhea in children and to determine their antimicrobial susceptibility patterns. Between June 2001 and January 2008, 249 children with bloody diarrhea were studied. Shigella and Shiga toxin-producing Escherichia coli (STEC) were recovered from 48 (19.3%) and 3 (1.2%) of the total of cases, respectively. In 49 out of 249 children, in whom other enteropathogens were investigated, we recovered Campylobacter jejuni from 7 children (14.3%), Salmonella spp. from 2 (4.1%) and Aeromonas spp. from 1 (2%) in addition to Shigella from 7 children (14.3%). Thirty-four (70%) Shigella isolates showed resistance to ampicillin and 13 (27%) to trimethoprim-sulfamethoxazole. All Shigella isolates were susceptible to nalidixic acid, ciprofloxacin and ceftriaxone. Salmonella and STEC isolates were susceptible to all antibiotics assayed. Thus, the use of trimethoprim-sulfamethoxazole or ampicillin would not be appropriate for the empirical treatment of Shigella - associated diarrhea.
Collapse
|
122
|
González S, Vega J, Murari A, Pereira A, Ramírez JM, Dormido-Canto S. Support vector machine-based feature extractor for L/H transitions in JET. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10E123. [PMID: 21061485 DOI: 10.1063/1.3502327] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Support vector machines (SVM) are machine learning tools originally developed in the field of artificial intelligence to perform both classification and regression. In this paper, we show how SVM can be used to determine the most relevant quantities to characterize the confinement transition from low to high confinement regimes in tokamak plasmas. A set of 27 signals is used as starting point. The signals are discarded one by one until an optimal number of relevant waveforms is reached, which is the best tradeoff between keeping a limited number of quantities and not loosing essential information. The method has been applied to a database of 749 JET discharges and an additional database of 150 JET discharges has been used to test the results obtained.
Collapse
|
123
|
|
124
|
Vega J, Murari A, Pereira A, González S, Pastor I. Accurate and reliable image classification by using conformal predictors in the TJ-II Thomson scattering. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10E118. [PMID: 21033983 DOI: 10.1063/1.3478689] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The charge-coupled device camera of the TJ-II Thomson scattering (TS) can capture five different classes of images. Typically, different data processing is performed depending on the kind of image that is acquired. The procedure can be automated to recognize the type of image. To this end, machine learning methods (MLM) are applied. However, usually, MLM classify without confidence estimates. An image classifier based on conformal predictors has been developed for the TJ-II TS. It provides a couple of indicators (confidence and credibility) for each classification that measures the accuracy and reliability of the prediction. Results achieve success rates of about 97%. The implemented classifier is valid for any kind of images.
Collapse
|
125
|
Gilaberte Y, González S. [Update on photoprotection]. ACTAS DERMO-SIFILIOGRAFICAS 2010; 101:659-672. [PMID: 20965009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023] Open
Abstract
Photoprotection is the primary preventive and therapeutic strategy against photoaging and skin cancer. This review presents the most important new advances in both topical and systemic photoprotection. Starting with innovations in the traditional physical and chemical filtering agents, we go on to discuss the growing number of antioxidants, the novel strategies for repairing light-induced DNA damage, and current research on substances that stimulate melanogenesis. A final section deals with protection against infrared radiation.
Collapse
|