IE Revista de Investigación Educativa de la REDIECH
El objetivo del presente estudio fue analizar, mediante la aproximación teórica de la integración... more El objetivo del presente estudio fue analizar, mediante la aproximación teórica de la integración cognitiva, el proceso de razonamiento covariacional de un grupo de estudiantes cuando interpretan el concepto de gasto hidráulico. Se diseñaron cinco actividades, aplicadas en modalidad virtual, de las cuales dos se reportan en este documento, que incluyeron el uso de simuladores dinámicos y cuadernillos digitales de trabajo. Las respuestas, gráficas y comentarios de los estudiantes fueron analizados con elementos teóricos de la integración cognitiva, del razonamiento variacional y covariacional y del gasto hidráulico. Se identificó la forma en que los estudiantes dan sentido a sus ideas matemáticas cuando analizan el fenómeno físico del llenado de cilindro; cómo movilizan su razonamiento variacional y covariacional para apoyar el entendimiento de las variables relacionadas con el gasto hidráulico y el cambio en las variables altura y volumen del líquido. El análisis de las evidencias p...
Object. According to a recent consensus statement on the treatment of acromegaly, its biochemical... more Object. According to a recent consensus statement on the treatment of acromegaly, its biochemical cure is defined as the normalization of age- and sex-adjusted insulin-like growth factor (IGF)—I levels and the suppression of growth hormone (GH) by glucose to lower than 1 ng/ml. The present study was prompted by the clinical observation that many cases of acromegaly can be considered cured according to one criterion but not others at different moments in a patient's postoperative course. Methods. Fifty-three patients with acromegaly (30 women and 23 men) harboring nine microadenomas and 44 macroadenomas were evaluated after surgery by assessing age- and sex-adjusted IGF-I levels as well as glucose-suppressed GH levels. Fifty of these patients were studied more than once during follow up. Acromegaly was categorized as cured if the patient's IGF-I level was normal and their glucose-suppressed GH level was lower than 1 ng/ml; the disease was considered to be active if the patien...
<p>NTA (Nanosight LM 10) recording of 100nm polystyrene particles (Kisker Biotech PPs-01) w... more <p>NTA (Nanosight LM 10) recording of 100nm polystyrene particles (Kisker Biotech PPs-01) which were diluted in essentially particle-free double distilled H2O. The temperature was 22 °C. The concentration was amounted to approximately 3x10^8 ml.</p> <p>The video pixel size is 164nm.</p> <p><strong>This video is part of a puplication: </strong></p> <p><strong>Wagner, T., Lipinski, H.-G. & Wiemann, M., 2014. Dark field nanoparticle tracking analysis for size characterization of plasmonic and non-plasmonic particles. Journal of Nanoparticle Research, 16(5), p.2419. Available at: http://link.springer.com/10.1007/s11051-014-2419-x<br></strong></p
People who execute construction proj- ects have to face situations which generate waste and delay... more People who execute construction proj- ects have to face situations which generate waste and delays. Because of this, it is a permanent challenge to increase construction productivity and resource optimization; this has been tackled in several ways, including the use of computation- al tools. In this paper, digital simulation models were elaborated based on real information com- ing from a programmable and autonomous mod- ule for digital photography shooting of the pro- cesses involved in post tensioned concrete slabs construction. These processes were character- ized taking into account activity flow, human re - source availability, and times involved in the ac- tivities. This information was the starting point for the creation of a digital simulation model that makes possible to analyze manpower disposition and productivity during the whole process and factors generating delays and loss. Furthermore, other digital simulation models were created in order to evaluate theoretical alte...
Humans subjected to diabetes mellitus (DM) and/or hypertension (HTN) develop cognitive decline, c... more Humans subjected to diabetes mellitus (DM) and/or hypertension (HTN) develop cognitive decline, cerebral atrophy and white matter abnormalities, but the relative effects of DM and HTN upon myelin and axonal integrity is unknown. We studied models of Type 1 (streptozotocin-induced) and Type 2 DM (ZDF)±HTN (ZSF-1, SHR) in adult rats using magnetic resonance imaging (MRI) and structural and molecular techniques.
Background: The lack of a unifying etiologic explanation for all GH-secreting tumors has prompted... more Background: The lack of a unifying etiologic explanation for all GH-secreting tumors has prompted a search that goes beyond the GSP oncogene. Somatotroph cell proliferation and hormonal secretion depend upon a proper GHRH signaling through specific heptahelic receptors. Activating mutations of other, related heptahelic receptors such as TSH receptor form the basis for hyperfunctioning thyroid adenomas. Objective: We sought to search for potentially activating mutations of the GHRH-R gene in a large number of GH-secreting tumors and in an equivalent number of non* Servicio de Endocrinologia y Unidad de Investigacion Medica en Endocrinologia Experimental, Servicio de Neurocirugia, UMAE Hospital de Especialidades, Centro Medico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de Mexico. Correspondencia: Moises Mercado Aristoteles Num. 68, Polanco, Mexico D.F. 11560, Mexico. Telefono y fax:+5255-52813029 o +525555190457, E-mail:mmercadoa@yahoo.commoises.mercado@imss.gob...
IE Revista de Investigación Educativa de la REDIECH
El objetivo del presente estudio fue analizar, mediante la aproximación teórica de la integración... more El objetivo del presente estudio fue analizar, mediante la aproximación teórica de la integración cognitiva, el proceso de razonamiento covariacional de un grupo de estudiantes cuando interpretan el concepto de gasto hidráulico. Se diseñaron cinco actividades, aplicadas en modalidad virtual, de las cuales dos se reportan en este documento, que incluyeron el uso de simuladores dinámicos y cuadernillos digitales de trabajo. Las respuestas, gráficas y comentarios de los estudiantes fueron analizados con elementos teóricos de la integración cognitiva, del razonamiento variacional y covariacional y del gasto hidráulico. Se identificó la forma en que los estudiantes dan sentido a sus ideas matemáticas cuando analizan el fenómeno físico del llenado de cilindro; cómo movilizan su razonamiento variacional y covariacional para apoyar el entendimiento de las variables relacionadas con el gasto hidráulico y el cambio en las variables altura y volumen del líquido. El análisis de las evidencias p...
Object. According to a recent consensus statement on the treatment of acromegaly, its biochemical... more Object. According to a recent consensus statement on the treatment of acromegaly, its biochemical cure is defined as the normalization of age- and sex-adjusted insulin-like growth factor (IGF)—I levels and the suppression of growth hormone (GH) by glucose to lower than 1 ng/ml. The present study was prompted by the clinical observation that many cases of acromegaly can be considered cured according to one criterion but not others at different moments in a patient's postoperative course. Methods. Fifty-three patients with acromegaly (30 women and 23 men) harboring nine microadenomas and 44 macroadenomas were evaluated after surgery by assessing age- and sex-adjusted IGF-I levels as well as glucose-suppressed GH levels. Fifty of these patients were studied more than once during follow up. Acromegaly was categorized as cured if the patient's IGF-I level was normal and their glucose-suppressed GH level was lower than 1 ng/ml; the disease was considered to be active if the patien...
<p>NTA (Nanosight LM 10) recording of 100nm polystyrene particles (Kisker Biotech PPs-01) w... more <p>NTA (Nanosight LM 10) recording of 100nm polystyrene particles (Kisker Biotech PPs-01) which were diluted in essentially particle-free double distilled H2O. The temperature was 22 °C. The concentration was amounted to approximately 3x10^8 ml.</p> <p>The video pixel size is 164nm.</p> <p><strong>This video is part of a puplication: </strong></p> <p><strong>Wagner, T., Lipinski, H.-G. & Wiemann, M., 2014. Dark field nanoparticle tracking analysis for size characterization of plasmonic and non-plasmonic particles. Journal of Nanoparticle Research, 16(5), p.2419. Available at: http://link.springer.com/10.1007/s11051-014-2419-x<br></strong></p
People who execute construction proj- ects have to face situations which generate waste and delay... more People who execute construction proj- ects have to face situations which generate waste and delays. Because of this, it is a permanent challenge to increase construction productivity and resource optimization; this has been tackled in several ways, including the use of computation- al tools. In this paper, digital simulation models were elaborated based on real information com- ing from a programmable and autonomous mod- ule for digital photography shooting of the pro- cesses involved in post tensioned concrete slabs construction. These processes were character- ized taking into account activity flow, human re - source availability, and times involved in the ac- tivities. This information was the starting point for the creation of a digital simulation model that makes possible to analyze manpower disposition and productivity during the whole process and factors generating delays and loss. Furthermore, other digital simulation models were created in order to evaluate theoretical alte...
Humans subjected to diabetes mellitus (DM) and/or hypertension (HTN) develop cognitive decline, c... more Humans subjected to diabetes mellitus (DM) and/or hypertension (HTN) develop cognitive decline, cerebral atrophy and white matter abnormalities, but the relative effects of DM and HTN upon myelin and axonal integrity is unknown. We studied models of Type 1 (streptozotocin-induced) and Type 2 DM (ZDF)±HTN (ZSF-1, SHR) in adult rats using magnetic resonance imaging (MRI) and structural and molecular techniques.
Background: The lack of a unifying etiologic explanation for all GH-secreting tumors has prompted... more Background: The lack of a unifying etiologic explanation for all GH-secreting tumors has prompted a search that goes beyond the GSP oncogene. Somatotroph cell proliferation and hormonal secretion depend upon a proper GHRH signaling through specific heptahelic receptors. Activating mutations of other, related heptahelic receptors such as TSH receptor form the basis for hyperfunctioning thyroid adenomas. Objective: We sought to search for potentially activating mutations of the GHRH-R gene in a large number of GH-secreting tumors and in an equivalent number of non* Servicio de Endocrinologia y Unidad de Investigacion Medica en Endocrinologia Experimental, Servicio de Neurocirugia, UMAE Hospital de Especialidades, Centro Medico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de Mexico. Correspondencia: Moises Mercado Aristoteles Num. 68, Polanco, Mexico D.F. 11560, Mexico. Telefono y fax:+5255-52813029 o +525555190457, E-mail:mmercadoa@yahoo.commoises.mercado@imss.gob...
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Papers by Alfonso Ovalle