29 results on '"Antequera R"'
Search Results
2. Brachyolmia With Amelogenesis Imperfecta: Further Evidence of a Distinct Entity
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Bertola, D. R., Antequera, R., Rodovalho, M. J., Honjo, R. S., Albano, L. M.J., Furquim, I. M., Oliveira, L. A., and Kim, C. A.
- Published
- 2009
- Full Text
- View/download PDF
3. Socio-technical approach to engineer gigabit app performance for physicaltherapy-as-a-service
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Antequera, R. Bazan, primary, Calyam, P., additional, Chemodanov, D., additional, de Donato, W., additional, Mishra, A., additional, Pescape, A., additional, and Skubic, M., additional
- Published
- 2017
- Full Text
- View/download PDF
4. Una visión histórica de las drogas de abuso desde la perspectiva criminológica (Parte II)
- Author
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López-Muñoz, F., González, E., Serrano, M.D., Antequera, R., and Alamo, C.
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Drugs of abuse ,History ,Drogas de abuso ,Crime genesis ,Criminología ,Criminology ,Delictogénesis ,Historia - Abstract
En la primera parte de este trabajo se analizó la historia de las principales drogas de abuso desde la vertiente criminológica y el desarrollo de la normativa legal para combatir estos problemas. En esta segunda parte, se analiza el vínculo entre el uso/abuso de drogas y la delictogénesis, que puede ser clasificado según una triple tipología: delincuencia inducida o delitos cometidos bajo el efecto de las drogas (delitos contra las personas y contra la seguridad del tráfico); delincuencia funcional/instrumental o delitos relacionados con las conductas encaminadas a financiar la propia dependencia (delitos contra la propiedad, como robos, asaltos); delincuencia relacional o delitos englobados en el concepto legal de narcotráfico (cultivo, elaboración y distribución de drogas de abuso). In the first part of this paper we analyzed the history of the main drugs of abuse from the criminological perspective and the development of legal norms to fight against these problems. In this second part, we analyze the link between drug use/abuse and the crime genesis, which can be classified according to a triple typology: induced crime, or crimes committed under the influence of drugs (crimes against the persons and traffic security); functional/instrumental crime, or crimes related to the behavior directed to pay for their dependency (crimes against property, such as robberies and assaults); relational crime, or crimes included in the legal concept of drug trafficking (cultivation, manufacture and distribution of drugs of abuse).
- Published
- 2011
5. Una visión histórica de las drogas de abuso desde la perspectiva criminológica (Parte I)
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López-Muñoz,F., González,E., Serrano,M.D., Antequera,R., and Alamo,C.
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Drogas de abuso ,Criminología ,Delictogénesis ,Historia - Abstract
La relación entre el consumo de drogas (incluyendo el fenómeno de las drogodependencias) y la criminología es sumamente estrecha, aunque aún no se ha podido establecer un nexo causal definitivo entre ambas. En el presente trabajo se revisa la historia de las drogodependencias y del uso de drogas y de la normativa legal para combatir estos problemas, iniciada en EE.UU. (Pure Food and Drug Act, 1906) y que culminaría, a nivel internacional, con la Convención Única sobre Estupefacientes de Viena (1988). En la segunda parte de este trabajo se analizará el vínculo entre el uso/abuso de drogas y la delictogénesis.
- Published
- 2011
6. Influencia de las Endotelinas y el Factor Natriurético Auricular en la respuesta cardiovascular al NaCl hipertónico administrado en la región anteroventral del tercer ventrículo de la rata
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Guía, A, Romero-Vecchione, E, Vásquez, J, Antequera, R, and Rosa, F
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Área anteroventral del tercer ventrículo (AV3V) ,Blood pressure regulation ,Control de la presión arterial ,Anteroventral area of third ventricle ,Hypertonic NaCl ,Sympathetic cardiovascular response ,NaCl hipertónico ,Respuesta simpática cardiovascular - Abstract
La región anteroventral del tercer ventrículo (AV3V) es capaz de detectar la concentración sanguínea de NaCl y ajustar la función cardiovascular y renal en respuesta a la composición hidroelectrolítica del líquido extracelular. La microinyección de NaCl hipertónico en esta área cerebral induce un incremento de la actividad simpática que aumenta de la presión arterial; la frecuencia cardíaca y la función renal. Estos cambios pueden ser modulados por la administración central de antagonistas de receptores 5HT2 de serotonina y bloqueadores de los receptores AT1 de angiotensina o por la administración periférica de antagonistas alfa y beta de los receptores adrenérgicos. El papel de las endotelinas cerebrales y del factor natriurético auricular (FNA) en esta región cerebral no ha sido estudiado. Se evaluó la participación de los receptores para endotelinas cerebrales y del FNA en la respuesta cardiovascular al NaCl hipertónico 1,5 M (2myL) administrado en la región AV3V de ratas anestesiadas. La microinyección de NaCl 1,5 M en la región AV3V de ratas normotensas produjo un incremento de la presión arterial media en un máximo de 17,9 ± 2,2 mm de Hg (p
- Published
- 2004
7. Influencia de la administración a largo plazo de aceites de palma y maíz en la dieta sobre la vasoconstricción y vasodilatación arterial de la aorta del conejo
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Scorza, T, E Romero, V, Vásquez, J, Antequera, R, Talise, M, and Duarte, MA
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Aceite de palma ,Lípidos plasmáticos ,C reactive protein ,apo-B ,Plasma lipids ,Reactividad vascular ,Corn oil ,apo-A-I ,Proteína C reactiva ,Palm oil ,Aceite de maíz ,apo A-I ,Vascular reactivity - Abstract
RESUMEN Se evaluó el efecto de la administración en la dieta de un suplemento de aceite de palma o de maíz a largo plazo sobre los lípidos sanguíneos y la reactividad arterial de anillos de aorta de conejo, a agentes vasoconstrictores y vasodilatadores dependientes e independientes del endotelio. Los conejos albinos fueron divididos en tres grupos de 12 conejos cada uno, que recibieron: Grupo I (control), dieta convencional de Conejarina®; Grupo II, Conejarina® con aceite de palma (10%); Grupo III: Conejarina® con aceite de maíz (10%) por un período de 4 meses. Se tomaron muestras de sangre al inicio y al final del estudio, cuando fueron anestesiados; se extrajo la aorta y se cortó en anillos que fueron incubados en solución de Krebs oxigenada para la evaluación de la reactividad a fenilefrina (FEN), acetilcolina (Ach) y nitroprusiato de sodio (NPS). El aceite de palma aumentó el colesterol total plasmático de 20,4 a 35.1 mg/dL (p0,05) y desplazó significativamente la CDR a la derecha en los que recibieron aceite de maíz (pa. ABSTRACT Influence of long-term palm and corn oil diet supplement administration on rabbit aortic rings vasoconstriction and vasodilatation. The effect of long-term diet administration of palm and corn oil to rabbits was evaluated on plasma lipids and aortic rings reactivity to vasoconstrictor and endothelium- dependent and -independent vasodilator agents. Albino rabbits were divided into three groups, (n=12 each) fed with the following diets, Group I: standard chow diet (Conejarina®); Group II: standard diet with 10% palm oil; and Group III: standard diet with 10% corn oil, during 4 months. Rabbits blood samples were obtained at the beginning and at the end of the study; then the animals were anesthetized, the thoracic aorta extracted and cut in rings which were incubated in oxygenated Krebs solution to evaluate its reactivity to phenylephrine (PHE), acetylcholine (Ach) and sodium nitroprusside (SNP). Total plasma cholesterol increased after palm oil administration, from 20.4 to 35.1 mg/dL (p0.05). In rabbits receiving corn oil, the DRC to PHE was significantly displaced to the right of the control group (pa-adrenergic agonist agents.
- Published
- 2003
8. Cambios Ontogénicos en la Reactividad Cardiovascular inducidos por los Esteroides Androgénicos
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Romero V, E, Antequera, R, Vásquez, J, Quijada, W, and Estrada, O
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Ontogeny ,Reactividad vascular ,Testosterone ,Endotelial vasodilatation ,Testosterona ,Vasodilatación endotelial ,Vascular reactivity ,Ontogenia - Abstract
La mayor incidencia epidemiológica de eventos cardiovasculares fatales en el hombre, comparado con la mujer ha sido objeto de numerosas investigaciones para determinar el grado de influencia de la testosterona, en este efecto. Es conocido el papel protector cardiovascular de los estrógenos. La protección cardiovascular por administración de estrógenos exógenos a la mujer postmenopáusica es de un 30-40%, al compararla con las que no los reciben. Sin embargo el papel de los andrógenos es menos conocido... ha sido menos estudiado. En algunos estudios con dosis muy altas, se ha encontrado que los andrógenos producen un perfil lipídico aterogénico, aumentan la LDL y reducen la HDL, sin embargo otros estudios han demostrado un efecto antiaterogénico. Por otra parte, la testosterona aumenta la adhesividad de los monocitos a las células endoteliales humanas y estas expresan con mayor intensidad la molécula de adhesión VCAM-1. Los macrófagos humanos, expuestos ex vivo a la dihidrotestosterona captan más ávidamente los lípidos, efecto que no es observado al ser expuestos a estrógenos. Se ha encontrado que la testosterona aumenta la respuesta vasodilatadora dependiente e independiente del endotelio, efecto que desaparece por efecto del humo de cigarrillo o por hipercolesterolemia experimental. Sin embargo, los resultados en relación a la vasodilatación son contradictorios, ya que la privación de andrógenos (quirúrgica o farmacológicamente) en pacientes con cáncer de próstata. Se desconocen los mecanismos moleculares por los que las andrógenos causarían vasodilatación. Un mecanismo probable por el cual la testosterona produce vasodilatación es la apertura de canales de potasio porque el efecto es antagonizado por el cloruro de bario, un bloqueante de dichos canales. Adicionalmente, se ha reportado que la vasodilatación experimental producida por esteroides androgénicos dependiente del endotelio, en ratas, es bloqueada por L-NAME; lo que sugiere que esta respuesta es mediada por el óxido nítrico. El desarrollo ontogénico de la vasodilatación dependiente del endotelio en la rata revela que esta es similar en machos y en hembras al nacer y aumenta progresivamente hasta llegar a la maduración sexual en etapa adulta; sin embargo la vasodilatación independiente del endotelio se atenúa con el desarrollo en la hembra y en el macho dicha respuesta se incrementa hasta llegar a un máximo que coincide con el desarrollo sexual determinado por la testosterona; esto indica que la hormona masculina confiere una mayor propiedad vasodilatadora independiente del endotelio a las arterias de las ratas macho. Se desconoce si este hecho ocurre también en el humano. Higher epidemiological incidence of fatal cardiovascular effects in men compared to women is the subject of intense research in order to find out the role of testosterone. Cardiovascular protection provided by estrogens in postmenopausal women is 30-40% when compared to untreated ones. Some studies have found that very high doses of androgenic steroids induce an atherogenic lipid profile by increasing LDL and reducing HDL; however, other studies have shown an antiatherogenic effect. Testosterone increases monocyte adhesion to human endothelial cells and in turn they express more intensely the adhesine molecule VCAM-1. Human "ex vivo" macrophages when exposed to testosterone can uptake more avidly a charge of lipid molecules while estrogens does not show this effect. It has been found that testosterone can increase the endothelial dependent and independent vasodilatory response, and this response is antagonized by tobacco smoke exposure or by experimental hypercholesterolemia. There has been contradictory effects of testosterone in man; besides its atherogenic -induced changes, in prostate cancer men deprived of androgens, endothelial vasodilatory response improves. The experimental vasodilatory response induced by testosterone is blocked by L-NAME, which suggests it is mediated by nitric oxide synthesis. The vasodilatory action of testosterone may by also caused by potassium channels opening because this effect is antagonized by barium chloride. The ontogenic development of the endothelial vasodilatory response in rats is similar in newborns male and female rats and progresively increase until sexual maturity is reached in both sexes. On the other hand; endothelial independent vasodilation diverges in both male and female rats; it increases up to sexual maturity in males and decreases until adult life in females; this means that male rats are provided in adult life with an stronger endogenous vascular non-endothelial vasodilator mechanism. It is unknown if this mechanism operates in male men.
- Published
- 2002
9. Disruption of the intestinal barrier and bacterial translocation in an experimental model of intestinal obstruction
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Antequera R, Bretaña A, Cirac A, Brito A, Manuel Romera, and Zapata R
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Male ,Rats, Sprague-Dawley ,Enterobacteriaceae ,Liver ,Ileum ,Bacterial Translocation ,Animals ,Female ,Intestinal Mucosa ,Peritoneal Cavity ,Intestinal Obstruction ,Rats - Abstract
Clinical evidence and the use of experimental models in laboratory animals indicate that the intestine is a reservoir of microorganisms that can cause systemic infection in the human. The purpose of this work was to study the possible effect of intestinal obstruction (IO) on the mechanical and chemical barriers that bring protection against microorganisms crossing from the intestinal lumen towards the systemic tissues. We demonstrated that 24 hours after IO, histological and ultrastructural alterations do occur, seriously compromising the structure of the intestinal barrier in 100% of the studied animals. Likewise, it was observed that during the same period, microorganisms translocation from intestine to the peritoneal cavity and liver (100 and 80% respectively) occurred. The lungs were spared. Changes observed in the intestinal epithelium are related to a process similar to that produced by intestinal ischemia: mitochondrial destruction, with subsequent decrease of its capacity to supply energy and to preserve the equilibrium and structure of the intestinal epithelium. We propose that translocation of enteric bacteria may be the cause of the infection that brings about the death a significant group of animals at 48 hours (27%) and 72 hours (33%) post-IO.
- Published
- 2000
10. RADIOMETRIC BLOCK ADJUSMENT AND DIGITAL RADIOMETRIC MODEL GENERATION
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Pros, A., primary, Colomina, I., additional, Navarro, J. A., additional, Antequera, R., additional, and Andrinal, P., additional
- Published
- 2013
- Full Text
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11. Una visión histórica de las drogas de abuso desde la perspectiva criminológica (Parte II)
- Author
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López-Muñoz, F., primary, González, E., additional, Serrano, M.D., additional, Antequera, R., additional, and Alamo, C., additional
- Published
- 2011
- Full Text
- View/download PDF
12. Prophylactic Low-energy Laser Application to Prevent Chemoradiation-induced Oral Mucositis: A Prospective and Randomized Trial
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Villar, R.C., primary, de Lima, A.G., additional, Junior, G.C., additional, Gil, E., additional, Rosalmeida, M.C., additional, Antequera, R., additional, Nadalin, W., additional, Weltman, E., additional, and Snitcovsky, I., additional
- Published
- 2009
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13. Plasma fatty acid changes in rats after long term fructose diet administration
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Romero-Vecchione, E., primary, Ortíz, H.N., additional, Scorza, T., additional, Vásquez, J.V., additional, Rosa, F., additional, and Antequera, R., additional
- Published
- 2008
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14. Myocardial and kidney histological – Ultrastuctural changes in rats with fructose-induced hypertension
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Romero-Vecchione, E., primary, Strauss, M., additional, Rosa, F., additional, Vazquez, J., additional, Antequera, R., additional, and Pinto, A., additional
- Published
- 2007
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15. Inmigracion ilegal y matricula general de extranjeros en Venezuela
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Michelena A, Antequera R, and Mota C
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irregular migrant, immigration, Colombia, Venezuela, economic conditions, migration policy, legal aspect, institutional framework, bibliography, Restricted, migrant irrégulier, immigration, Colombie, Venezuela, migrante irregular, inmigración, Colombia, Venezuela, conditions économiques, politique migratoire, aspect juridique, cadre institutionnel, bibliographie, condiciones económicas, política migratoria, aspecto jurídico, organización institucional, bibliografía - Abstract
ILO pub. Working paper on irregular migrants (mainly immigration from Colombia) and the General Register of Foreigners in Venezuela - covers immigration in the 1970s and its relationship to economic conditions, migration policy, and the legal aspects and institutional framework for registering and legalizing immigrants. Bibliography. Restricted.
- Published
- 1984
16. Illegal immigration and the general register of foreigners in Venezuela
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Michelena A, Antequera R, and Mota C
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irregular migrant, immigration, Colombia, Venezuela, economic conditions, migration policy, legal aspect, institutional framework, bibliography, Restricted, migrant irrégulier, immigration, Colombie, Venezuela, migrante irregular, inmigración, Colombia, Venezuela, conditions économiques, politique migratoire, aspect juridique, cadre institutionnel, bibliographie, condiciones económicas, política migratoria, aspecto jurídico, organización institucional, bibliografía - Abstract
ILO pub. Working paper on irregular migrants (mainly immigration from Colombia) and the General Register of Foreigners in Venezuela - covers immigration in the 1970s and its relationship to economic conditions, migration policy, and the legal aspects and institutional framework for registering and legalizing immigrants. Bibliography. Restricted.
- Published
- 1984
17. Notas sobre Mesostigmata Neotropicales V. Algunos datos sobre la distribución y huéspedes de los Spinturnicidae de Colombia (Acarina, Mesostigmata, Spinturnicidae)
- Author
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Machado-Allison, C. E., Antequera, R., Machado-Allison, C. E., and Antequera, R.
- Abstract
La fauna de ectoparásitos de mamíferos de Colombia, particularmente la de Chiroptera, es poco conocida. En los últimos años, gracias a la labor desarrollada por algunos parasitólogos, ha sido posible adquirir nuevos y valiosos datos sobre algunas formas. Una de las personas que más han contribuído a la adquisición de estos datos es el profesor doctor C. J. Marinkelle,de la Universidad de los Andes, a quien agradecemos el envío delmaterial aqui estudiado.
- Published
- 1969
18. Efecto cardiovascular excitatorio en la rata, de una fracción aislada del tallo óptico del camarón: Peneaus vanameii
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Rosa, F., Cedeño, J., León, L., Omar Estrada, Romero-Vecchione, E., Vásquez, J., and Antequera, R.
- Subjects
heart rate ,blood pressure ,Peneaus vanameii ,peptide fraction ,fracción peptídica ,presión arterial ,frecuencia cardiaca - Abstract
The crustacean nervous system is an important source of substances with diverse biological activities, particularly affecting invertebrate cardiocirculatory physiology. However, the effects of these substances on the cardiovascular system of higher vertebrates are not very well documented. The purpose of this study was to evaluate the effects of a cardioexcitatory substance (CES) isolated from the eyestalk of the shrimp Peneaus vanameii on rat cardiovascular function. The administration of a purified fraction of this substance raised mean arterial pressure by 37.33 ± 5.00 mm Hg, pulse pressure 35.00 ± 4.93 mm Hg and heart rate 80.00 ± 12.83 beats/min over basal values (p < 0.01). Evaluation of the possible underlying mechanisms of this hypertensive and tachycardic effect reveled that dihydroergotamine pretreatment (20 µg/0.2 mL) reduced the effect of CES on mean blood pressure, but not on heart rate. Propranolol pretreatment (4 µg/0.2 mL) reduced the tachycardia, but not the hypertensive response. Enalapril pretreatment (5 µg/0.2 mL) did not modify the effects induced by CES on heart rate or blood pressure, and the verapamil pretreatment (1 µg/0.2 mL) reduced both cardiovascular changes by 85% (p < 0.01). These results indicate that CES isolated from the shrimp eyestalk produces hypertension and tachycardia mediated by adrenergic receptors in association to calcium channels activation. El sistema nervioso de crustáceos es una fuente importante de sustancias con actividad biológica diversa, particularmente la que afecta la fisiología cardiocirculatoria de los invertebrados. Sin embargo, los efectos de estas sustancias sobre el sistema cardiovascular de mamíferos no están bien documentados. El objetivo de este estudio, fue evaluar los efectos de una sustancia cardioexcitatoria (SCE) aislada del tallo óptico del camarón Peneaus vanameii sobre la función cardiovascular de la rata. La administración de una fracción purificada de esta sustancia incrementó la presión arterial media en 37,33 ± 5,0 mm de Hg, la presión arterial diferencial en 35,00 ± 4,93 mm de Hg, así como la frecuencia cardiaca 80,00 ± 12,83 lat/min sobre los valores basales (p < 0,01). La evaluación del mecanismo por el cual este efecto hipertensor y taquicardizante se produjo indicó que el tratamiento con dihidroergotamina (20 µg/0,2 mL) redujo los efectos del SCE sobre la presión arterial media, pero no sobre la frecuencia cardiaca. El pretratamiento con propranolol (4 µg/0,2 mL) redujo la taquicardia pero no la respuesta hipertensiva. El pretratamiento con enalapril (5 µg/0,2 mL) no modificó los efectos inducidos por SCE sobre el corazón o los vasos sanguíneos, el pretratamiento con verapamil (1 µg/0,2 mL) redujo ambos cambios cardiovasculares en un 85% (p < 0,01). Estos resultados indican que el SCE aislado del tallo óptico del camarón produce hipertensión y taquicardia mediada a través de receptores adrenérgicos, en asociación con una activación de los canales de calcio
19. Socio-technical approach to engineer gigabit app performance for physicaltherapy-as-a-service
- Author
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R. Bazan Antequera, W. de Donato, Marjorie Skubic, Dmitrii Chemodanov, Prasad Calyam, Anup K. Mishra, Antonio Pescape, Antequera, R. Bazan, Calyam, P., Chemodanov, D., De Donato, W., Mishra, A., Pescape, A., and Skubic, M.
- Subjects
Health Informatic ,Service (systems architecture) ,Health (social science) ,business.industry ,Computer science ,PerfSONAR ,Network engineering ,Smart Health App ,020206 networking & telecommunications ,Computer Science Applications1707 Computer Vision and Pattern Recognition ,02 engineering and technology ,Virtualization ,computer.software_genre ,Gigabit Access Network ,World Wide Web ,Computer Networks and Communication ,User experience design ,Gigabit ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Network performance ,Instrumentation (computer programming) ,business ,computer ,Remote Physical Therapy - Abstract
The deployment of Gigabit Apps owing to their high-bandwidth and low-latency nature pushes the limits of today's end-to-end networking, and reveals new bottlenecks at multiple layers of networking, virtualization, application and user experience. In this paper, we use an exemplar smart health related Gigabit App use case viz., PhysicalTherapy-as-a-Service to show how a multi-layer instrumentation approach of measurement points was critical to successfully deploy our lab-tested App out to residential homes with Google Fiber connections. The salient instrumentation strategies involved an organized co-design method between the App Developer and Network Engineer roles, and a multi-domain network performance monitoring featuring perfSONAR extensions, both of which were realized through our Narada Metrics framework. Our instrumentation strategies engendered a “socio-technical tool” for co-ordination between multi-layer stakeholders in identifying and overcoming the intertwined bottlenecks, and in tuning the App performance. Our results highlight the new instrumentation and measurement challenges to foster multi-layer stakeholder collaboration, and provide rare insights to the budding Gigabit App developer community for performance engineering their Apps to serve residential users.
- Published
- 2017
20. Increased Anxiety-Like Behavior in the Acute Phase of a Preclinical Model of Periodontal Disease.
- Author
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Varotto BLR, Martinez RCR, Gouveia FV, Antunes GF, Fabri GMC, Ballester G, Antequera R, de Siqueira SRDT, Fonoff ET, Teixeira MJ, and de Siqueira JTT
- Abstract
Periodontal disease (PD) is an infectious-inflammatory oral disease that is highly prevalent among adolescence and adulthood and can lead to chronic orofacial pain and be associated with anxiety, stress and depression. This study aimed to identify anxiety-like behaviors in the ligature-induced murine preclinical model of PD in different phases of the disease (i.e., acute vs. chronic). Also, we investigated orofacial mechanical allodynia thresholds and superficial cortical plasticity along the orofacial motor cortex in both disease phases. To this aim, 25 male Wistar rats were randomly allocated in acute (14 days) or chronic (28 days) ligature-induced-PD groups and further divided into active-PD or sham-PD. Anxiety-like behavior was evaluated using the elevated plus maze, mechanical allodynia assessed using the von Frey filaments test and superficial motor cortex mapping was performed with electrical transdural stimulation. We observed increased anxiety-like behavior in active-PD animals in the acute phase, characterized by decreased number of entries into the open arm extremities [ t
(1,7) = 2.42, p = 0.04], and reduced time spent in the open arms [ t(1,7) = 3.56, p = 0.01] and in the open arm extremities [ t(1,7) = 2.75, p = 0.03]. There was also a reduction in the mechanical allodynia threshold in all active-PD animals [Acute: t(1,7) = 8.81, p < 0.001; Chronic: t(1,6) = 60.0, p < 0.001], that was positively correlated with anxiety-like behaviors in the acute group. No differences were observed in motor cortex mapping. Thus, our findings show the presence of anxiety-like behaviors in the acute phase of PD making this a suitable model to study the impact of anxiety in treatment response and treatment efficacy., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2020 Varotto, Martinez, Gouveia, Antunes, Fabri, Ballester, Antequera, de Siqueira, Fonoff, Teixeira and de Siqueira.)- Published
- 2020
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21. Mutations in the latent TGF-beta binding protein 3 (LTBP3) gene cause brachyolmia with amelogenesis imperfecta.
- Author
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Huckert M, Stoetzel C, Morkmued S, Laugel-Haushalter V, Geoffroy V, Muller J, Clauss F, Prasad MK, Obry F, Raymond JL, Switala M, Alembik Y, Soskin S, Mathieu E, Hemmerlé J, Weickert JL, Dabovic BB, Rifkin DB, Dheedene A, Boudin E, Caluseriu O, Cholette MC, Mcleod R, Antequera R, Gellé MP, Coeuriot JL, Jacquelin LF, Bailleul-Forestier I, Manière MC, Van Hul W, Bertola D, Dollé P, Verloes A, Mortier G, Dollfus H, and Bloch-Zupan A
- Subjects
- Adolescent, Amelogenesis Imperfecta diagnostic imaging, Animals, Base Sequence, Child, Consanguinity, DNA Mutational Analysis, Female, Frameshift Mutation, Genetic Association Studies, Humans, Male, Mice, Mice, Inbred C57BL, Mice, Knockout, Mutation, Missense, Osteochondrodysplasias diagnostic imaging, Pedigree, Radiography, Sequence Deletion, Amelogenesis Imperfecta genetics, Latent TGF-beta Binding Proteins genetics, Osteochondrodysplasias genetics
- Abstract
Inherited dental malformations constitute a clinically and genetically heterogeneous group of disorders. Here, we report on four families, three of them consanguineous, with an identical phenotype, characterized by significant short stature with brachyolmia and hypoplastic amelogenesis imperfecta (AI) with almost absent enamel. This phenotype was first described in 1996 by Verloes et al. as an autosomal recessive form of brachyolmia associated with AI. Whole-exome sequencing resulted in the identification of recessive hypomorphic mutations including deletion, nonsense and splice mutations, in the LTBP3 gene, which is involved in the TGF-beta signaling pathway. We further investigated gene expression during mouse development and tooth formation. Differentiated ameloblasts synthesizing enamel matrix proteins and odontoblasts expressed the gene. Study of an available knockout mouse model showed that the mutant mice displayed very thin to absent enamel in both incisors and molars, hereby recapitulating the AI phenotype in the human disorder., (© The Author 2015. Published by Oxford University Press.)
- Published
- 2015
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22. Oral mucositis prevention by low-level laser therapy in head-and-neck cancer patients undergoing concurrent chemoradiotherapy: a phase III randomized study.
- Author
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Gouvêa de Lima A, Villar RC, de Castro G Jr, Antequera R, Gil E, Rosalmeida MC, Federico MH, and Snitcovsky IM
- Subjects
- Adenocarcinoma, Clear Cell radiotherapy, Adenocarcinoma, Clear Cell secondary, Adult, Aged, Body Weight, Brazil, Carcinoma radiotherapy, Cisplatin, Deglutition Disorders etiology, Double-Blind Method, Female, Humans, Male, Middle Aged, Pain Measurement, Prospective Studies, Radiotherapy Dosage, Stomatitis etiology, Stomatitis pathology, Treatment Failure, Young Adult, Carcinoma, Squamous Cell radiotherapy, Chemoradiotherapy adverse effects, Head and Neck Neoplasms radiotherapy, Lasers, Semiconductor therapeutic use, Low-Level Light Therapy methods, Stomatitis prevention & control
- Abstract
Purpose: Oral mucositis is a major complication of concurrent chemoradiotherapy (CRT) in head-and-neck cancer patients. Low-level laser (LLL) therapy is a promising preventive therapy. We aimed to evaluate the efficacy of LLL therapy to decrease severe oral mucositis and its effect on RT interruptions., Methods and Materials: In the present randomized, double-blind, Phase III study, patients received either gallium-aluminum-arsenide LLL therapy 2.5 J/cm(2) or placebo laser, before each radiation fraction. Eligible patients had to have been diagnosed with squamous cell carcinoma or undifferentiated carcinoma of the oral cavity, pharynx, larynx, or metastases to the neck with an unknown primary site. They were treated with adjuvant or definitive CRT, consisting of conventional RT 60-70 Gy (range, 1.8-2.0 Gy/d, 5 times/wk) and concurrent cisplatin. The primary endpoints were the oral mucositis severity in Weeks 2, 4, and 6 and the number of RT interruptions because of mucositis. The secondary endpoints included patient-reported pain scores. To detect a decrease in the incidence of Grade 3 or 4 oral mucositis from 80% to 50%, we planned to enroll 74 patients., Results: A total of 75 patients were included, and 37 patients received preventive LLL therapy. The mean delivered radiation dose was greater in the patients treated with LLL (69.4 vs. 67.9 Gy, p = .03). During CRT, the number of patients diagnosed with Grade 3 or 4 oral mucositis treated with LLL vs. placebo was 4 vs. 5 (Week 2, p = 1.0), 4 vs. 12 (Week 4, p = .08), and 8 vs. 9 (Week 6, p = 1.0), respectively. More of the patients treated with placebo had RT interruptions because of mucositis (6 vs. 0, p = .02). No difference was detected between the treatment arms in the incidence of severe pain., Conclusions: LLL therapy was not effective in reducing severe oral mucositis, although a marginal benefit could not be excluded. It reduced RT interruptions in these head-and-neck cancer patients, which might translate into improved CRT efficacy., (Copyright © 2012 Elsevier Inc. All rights reserved.)
- Published
- 2012
- Full Text
- View/download PDF
23. Efficacy of low-level laser therapy and aluminum hydroxide in patients with chemotherapy and radiotherapy-induced oral mucositis.
- Author
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Lima AG, Antequera R, Peres MP, Snitcosky IM, Federico MH, and Villar RC
- Subjects
- Combined Modality Therapy, Head and Neck Neoplasms drug therapy, Head and Neck Neoplasms radiotherapy, Humans, Prospective Studies, Radiation Injuries etiology, Radiation Injuries radiotherapy, Radiotherapy adverse effects, Stomatitis etiology, Treatment Outcome, Aluminum Hydroxide administration & dosage, Head and Neck Neoplasms complications, Low-Level Light Therapy methods, Mouthwashes therapeutic use, Stomatitis prevention & control
- Abstract
This study evaluated the efficacy of low-level laser therapy (LLLT) and aluminum hydroxide (AH) in the prevention of oral mucositis (OM). A prospective, comparative and non-randomized study was conducted with 25 patients with head and neck cancer subjected to radiotherapy (RT) or radiochemotherapy (RCT). Twelve patients received LLLT (830 nm, 15 mW, 12 J/cm²) daily from the 1st day until the end of RT before each sessions during 5 consecutive days, and the other 13 patients received AH 310 mg/5 mL, 4 times/day, also throughout the duration of RT, including weekends. OM was measured using an oral toxicity scale (OTS) and pain was measured using the visual analogue scale (VAS). EORTC questionnaires were administered to the evaluate impact of OM on quality of life. The LLLT group showed lower mean OTS and VAS scores during the course of RT. A significant difference was observed in pain evaluation in the 13th RT session (p=0.036). In both groups, no interruption of RT was needed. The prophylactic use of both treatments proposed in this study seems to reduce the incidence of severe OM lesions. However, the LLLT was more effective in delaying the appearance of severe OM.
- Published
- 2010
- Full Text
- View/download PDF
24. [Cardiovascular responses to hypertonic NaCI injection into the anteroventral third ventricle region in rats with fructose-induced hypertension and insulin resistance].
- Author
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Rosa FJ, Romero-Vecchione E, Vásquez J, Antequera R, and Strauss M
- Subjects
- Animals, Fructose administration & dosage, Heart Ventricles, Hypertension chemically induced, Hypertonic Solutions, Injections, Insulin Resistance, Male, Rats, Rats, Sprague-Dawley, Cardiovascular System drug effects, Cardiovascular System physiopathology, Hypertension physiopathology, Sodium Chloride administration & dosage
- Abstract
Introduction and Objectives: To investigate the hemodynamic sympathetic response evoked by NaCI microinjection into the third ventricle anteroventral brain area (AV3V) in rats long-term fed with high fructose diet., Methods: Twelve male rats received 60% fructose enriched diet for 6 months. Control rats (n=12) received regular diet., Results: Fructose diet increased (P< .01) body weight; plasma glucose, triglycerides; cholesterol, insulin; systolic (SBP) and diastolic blood pressure (DBP). Basal heart rate (HR) did not change. AV3V microinjection of 2 microL of hypertonic 1.5 M NaCI in fructose fed rats increased SBP 44.64(3.6) mm Hg, DBP 19.9(2.4) mm Hg and HR 66.2(8.4) beats/min over basal values (P< .01). In control rats, smaller responses were observed, SBP increased 28.33(3.10) mm Hg, DBP 13.0(1.9) mm Hg and HR 23.0(5.0) beats/min over basal values (P< .01)., Conclusions: Long-term fructose diet in rats induces cardiovascular hyperactivity of AV3V neurons to sodium chloride, and is associated to hypertension and insulin-resistance.
- Published
- 2007
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25. Cardiovascular excitatory effect on rats of a fraction isolated from the eyestalk of shrimp: Peneaus vanameii.
- Author
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Rosa F, Cedeño J, León L, Estrada O, Romero-Vecchione E, Vásquez J, and Antequera R
- Subjects
- Animal Structures chemistry, Animals, Anti-Arrhythmia Agents pharmacology, Anti-Arrhythmia Agents therapeutic use, Antihypertensive Agents pharmacology, Antihypertensive Agents therapeutic use, Blood Pressure drug effects, Calcium Channels drug effects, Cardiotonic Agents isolation & purification, Dihydroergotamine pharmacology, Dihydroergotamine therapeutic use, Drug Evaluation, Preclinical, Enalapril pharmacology, Enalapril therapeutic use, Ganglia, Invertebrate drug effects, Heart Rate drug effects, Hypertension chemically induced, Hypertension prevention & control, Male, Motor Neurons drug effects, Neuropeptides isolation & purification, Premedication, Propranolol pharmacology, Propranolol therapeutic use, Rats, Rats, Sprague-Dawley, Receptors, Adrenergic, beta drug effects, Tachycardia chemically induced, Tachycardia prevention & control, Tissue Extracts isolation & purification, Verapamil pharmacology, Verapamil therapeutic use, Cardiotonic Agents pharmacology, Hemodynamics drug effects, Neuropeptides pharmacology, Penaeidae chemistry, Tissue Extracts pharmacology
- Abstract
The crustacean nervous system is an important source of substances with diverse biological activities, particularly affecting invertebrate cardiocirculatory physiology. However, the effects of these substances on the cardiovascular system of higher vertebrates are not very well documented. The purpose of this study was to evaluate the effects of a cardioexcitatory substance (CES) isolated from the eyestalk of the shrimp Peneaus vanameii on rat cardiovascular function. The administration of a purified fraction of this substance raised mean arterial pressure by 37.33 +/- 5.00 mm Hg, pulse pressure 35.00 +/- 4.93 mm Hg and heart rate 80.00 +/- 12.83 beats/min over basal values (p < 0.01). Evaluation of the possible underlying mechanisms of this hypertensive and tachycardic effect reveled that dihydroergotamine pretreatment (20 microg/0.2 mL) reduced the effect of CES on mean blood pressure, but not on heart rate. Propranolol pretreatment (4 microg/0.2 mL) reduced the tachycardia, but not the hypertensive response. Enalapril pretreatment (5 microg/0.2 mL) did not modify the effects induced by CES on heart rate or blood pressure, and the verapamil pretreatment (1 microg/0.2 mL) reduced both cardiovascular changes by 85% (p < 0.01). These results indicate that CES isolated from the shrimp eyestalk produces hypertension and tachycardia mediated by adrenergic receptors in association to calcium channels activation.
- Published
- 2006
26. Testosterone and nandrolone sensitization of brain anteroventral area of third ventricle to hypertonic NaCl-induced sympathetic response.
- Author
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Rosa F, Antequera R, Vásquez J, Romero-Vecchione E, and Martínez A
- Subjects
- Androgens administration & dosage, Animals, Blood Pressure drug effects, Cholesterol, HDL blood, Cholesterol, LDL blood, Drug Synergism, Heart Rate drug effects, Hypertension blood, Hypertension chemically induced, Injections, Intraventricular, Male, Nandrolone administration & dosage, Rats, Rats, Sprague-Dawley, Saline Solution, Hypertonic, Testosterone administration & dosage, Third Ventricle drug effects, Time Factors, Triglycerides blood, Androgens pharmacology, Brain drug effects, Hypertension physiopathology, Nandrolone pharmacology, Sympathetic Nervous System drug effects, Testosterone pharmacology
- Abstract
Androgenic steroids increase atherogenesis, thrombogenicity and endothelial dysfunction when administered in high doses, however their effects on NaCl sensitivity of the brain anteroventral area of the third ventricle (DeltaV3V) have not been explored. Sprague-Dawley male rats were anesthetized with sodium pentobarbital (40 mg/kg) and the femoral intra-arterial blood pressure and heart rate monitored through a strain-gauge blood pressure transducer and tachograph. DeltaV3V microinjections of (2 microl) 1.5 mol/l NaCl solution were done according to brain coordinates: AP = 7.0 mm, L = 1.0 mm, D = 7.5 mm through a 0.2-mm diameter stainless steel needle. The injection site was verified with 1.0 microl neutral red solution. Basal systolic blood pressure increased 37.6 and 39.6 mm Hg after testosterone (1 mg/kg/day for 20 days) and nandrolone (1 mg/kg/day for 20 days) treatment respectively; diastolic blood pressure also increased upon testosterone and nandrolone treatment in 36.4 and 53.1 mm Hg, respectively; basal heart rate did not change. Vasopressor response to 1.5 mol/l NaCl DeltaV3V microinjection was higher in testosterone-treated rats; systolic blood pressure increased 56.0 vs. 28.3 control mm Hg; diastolic blood pressure increased 54.0 vs. 25 control mm Hg. This hypertensive response was 29% longer lasting in testosterone compared to vehicle-treated rats. The same pattern of DeltaV3V sensitization to hypertonic NaCl was observed in nandrolone-treated rats. Blood lipid profile changed to a proatherogenic fashion upon testosterone and nandrolone long-term treatment; the plasma-free testosterone concentration increased from 4.9 +/- 0.9 to 36.0 +/-7.1 pg/ml with the same testosterone treatment schedule. In conclusion, long-term androgenic steroid treatment sensitizes the brain DeltaV3V region to hypertonic NaCl which in turn conducts into a sympathetic vasopressor and heart rate-stimulating action., (Copyright (c) 2005 S. Karger AG, Basel.)
- Published
- 2005
- Full Text
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27. Cocaine long-term administration induces myocardial depressant effects and adrenoceptors desensitization.
- Author
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Romero Vecchione E, Vázquez J, Bermudez M, Negrín D, and Antequera R
- Subjects
- Adrenergic Agonists metabolism, Animals, Cocaine administration & dosage, Depression, Chemical, Dose-Response Relationship, Drug, Heart Ventricles drug effects, Isoproterenol metabolism, Phenylephrine metabolism, Rats, Rats, Sprague-Dawley, Adrenergic Agonists pharmacology, Cocaine pharmacology, Isoproterenol pharmacology, Myocardial Contraction drug effects, Phenylephrine pharmacology
- Abstract
Cocaine as a drug of abuse can cause many cardiovascular toxic effects. The objective of this work was to study the mechanism of the negative inotropic effect of cocaine on isolated right ventricle strips and its relationship with myocardial catecholamines desensitization after long- term cocaine administration. Right ventricle strips were incubated in oxygenated Krebs solution at 37 degrees C, and driven with 2 ms, 15 mA, 1.8 Hz electric square pulses. Beat tension force was recorded with a force-displacement transducer. In control long-term saline (0.9% NaCl) treated rats (0.1 mL/Kg x 15 days, s.c.), in vitro 0.1-30 microM cocaine progressively increased the ventricle strip force up to 53% over baseline value. On the contrary, a negative inotropic effect of cocaine was observed in strips obtained from long-term cocaine treated rats (3 mg/Kg x 15 days, s.c.). The contractile force change ("Bowditch" phenomenon) induced by short (30s) rising of myocardial stimulating frequency to 2.7, 3.5 and 4.3 Hz respectively, was completely reversed in ventricular strips obtained from long-term cocaine treated rats. Myocardial desensitization to isoproterenol (saline 4.67 nM Vs cocaine 13.17 nM DE50) and to phenylephrine (saline 5.44 nM Vs cocaine 8.6 nM DE50) was observed in long term cocaine treated rats when compared to the control group. Aorta desensitization to phenylephrine-induced constriction in long-term cocaine treated rats was also observed; phenylephrine DE50 increased from 1.9 nmol/l in control rats to 15.5 nmol/l in long-term cocaine treated ones. Cocaine metabolites, benzoylecgonine and ecgonine methyl ester were excreted (121.6 micrograms/ml) in urine samples from all cocaine treated rats and not in the saline treated group. Long-term cocaine treatment seems to interfere with the cytosolic calcium increase that normally occurs during systole; this could explain its negative inotropic effect observed during in vitro cocaine reexposure. The adrenergic receptor desensitization induced by chronic cocaine administration could lead to a full expression of the negative inotropic effect of this drug. Extrapolated to clinical grounds, this mechanism could explain some clinical cases of heart failure reported in cocaine overdosed addicts.
- Published
- 2002
28. [Bacterial translocation in a model of intestinal obstruction. II. Bacteriological study and role of cellular immunity].
- Author
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Zapata-Sirvent RL, Marzullo Mónaco V, Piñate S, del Médico P, Urbina A, Larocca A, Antequera R, Guzmán M, and Pifano E
- Subjects
- Animals, Bacterial Infections immunology, Female, Immunity, Cellular immunology, Intestinal Mucosa immunology, Intestinal Mucosa microbiology, Intestinal Obstruction immunology, Laparotomy, Male, Rats, Rats, Inbred Strains, Bacterial Infections etiology, Intestinal Obstruction microbiology
- Abstract
Bacterial translocation (Bt) from the gastrointestinal (GI) tract to systemic organs creates the possibility of Infection and sepsis in a great number of pathologic entities. In a mouse model of Intestinal Obstruction (IO), we evaluated the type of micro-organisms and the organs that bacteria frequent translocated. At 24 hours post-10, positive cultures where obtained at the MLN, portal, systemic circulation and peritoneal cavity, establishing that the translocation is bi-directional. The more frequent bacteria isolated were the Streptococcus group D, Proteus mirabilis, Escherichia coli, Pseudomonas sp., an clostridium. BT occurs at 24 hour post-OI and was due to increased intestinal permeability, at 48 hrs BT increased and related to the physical disruption of the mucosal barrier in the intestinal mucosa. Cell mediated immunity (CMI) response in this model was not altered, although a progressive decrease was observed at 48 hrs it was not significant, suggesting that the CMI play no role in the pathogenesis of BT. In the Control-Laparotomy group, CMI response was increased significantly at 48 hours, suggesting that a simple laparotomy boost the immune defense response.
- Published
- 1991
29. [Factors involved in bacterial translocation in an experimental model of intestinal obstruction].
- Author
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Zapata-Sirvent RL, Larocca A, Piñate S, Antequera R, González RC, del Médico P, París MM, Castro MJ, Marzullo V, and Olavarría R
- Subjects
- Animals, Disease Models, Animal, Female, Intestinal Mucosa microbiology, Intestinal Mucosa pathology, Intestinal Obstruction pathology, Rats, Rats, Inbred Strains, Bacterial Infections etiology, Intestinal Obstruction microbiology
- Abstract
We designed a model of intestinal obstruction (IO) to study the histological alterations in the intestinal wall and the mesenteric lymph nodes (MLN). Therefore we used 32 Sprague-Dawley rats and under anesthesia a laparotomy was performed and the distal ileum was ligated with 3-0 silk, producing a complete occlusion. At different interval (24, 48, 72 and 96 hours) the animals were sacrificed by cervical dislocation and were histologically analyzed. At 24 hours post IO, congestion, edema and a inflammatory infiltrate were observed at the level of the lamina propia and the MLN were reactive. At 48 hours the congestion and edema increased and the intestinal mucosa began to fragment, allowing the bacteria to translocate and getting to the lymph nodes in the intestinal wall. The reactivity at the MLN increased. The observation of bacterial translocation in IO widen the scope of the alterations in this pathology, were not only absorption of toxic products and endotoxin occurs in the compromise segment and this phenomenon could explain the incidence of bacteremia and sepsis in the IO patients.
- Published
- 1989
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