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SUMMARY The use of Magnetic Resonance Imaging (MRI) in the diagnosis and follow-up of patients with Multiple Sclerosis (MS) has optimized the care of the affected patients. Several international working groups have tried to clarify and standardize the global use of MRI but, on many occasions, data are extrapolated from other regions, do not contemplate local realities or are difficult to implement. Objective: To reach a consensus on aspects related to the use of MRI in the diagnosis and follow-up of patients with MS in Peru. Material and Methods: A group of Peruvian experts (neurologists and radiologists) worked on the elaboration of the consensus using a remote survey round methodology. Results: The recommendations, established on the basis of published evidence and on the experts’ criteria, focused on the role of both, the conventional MRI techniques and the measurement of brain atrophy in MS patients both at the time of diagnosis and during the follow-up period Conclusions: The consensual recommendations could potentially assist in the standardization and optimization of the care and follow-up of patients with MS in our country.

RESUMEN El uso de la resonancia magnética (RM) en el diagnóstico y seguimiento de pacientes con esclerosis múltiple (EM) ha optimizado el cuidado de los pacientes afectados. Diversos grupos internacionales de trabajo han intentado clarificar y normatizar el uso global de la RM pero, en muchas ocasiones, se extrapolan datos de otras regiones que no contemplan la realidad de cada lugar o son difíciles de implementar. Objetivo: Consensuar aspectos relacionados con el uso de RM en el diagnóstico y seguimiento de pacientes con EM en el Perú. Material y Métodos: Un grupo de expertos peruanos, conformado por neurólogos y radiólogos, condujo la elaboración del consenso mediante metodología de ronda de encuestas a la distancia. Resultados: Las recomendaciones, basadas en la evidencia publicada y en el criterio de los expertos, enfocaron tanto el rol de las técnicas convencionales de RM como el de la medición de la atrofia cerebral en pacientes con EM al momento del diagnóstico y durante el periodo de seguimiento. Conclusiones: Las recomendaciones del consenso podrán potencialmente homogenizar y optimizar el cuidado y seguimiento de pacientes con EM en nuestro país.

https://doi.org/10.20453/rnp.v85i2.4227

Clinical considerations on the introduction of ocrelizumab in Mexico
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Ordoñez-Boschetti, Laura

; Velázquez-Quintana, Merced

; Skromne-Eisenberg, Eli

; Treviño-Frenk, Irene

; Rivas-Alonso, Verónica

; Bertado-Cortes, Brenda

; Maza-Flores, Manuel De la

; Quiñones-Aguilar, Sandra

; Amaya-Sánchez, Luis

; Llamas-López, Leonardo

; Gonzalez-Amezquita, Victor

Revista mexicana de neurociencia

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jun 2020, Volume 21 N. 3 Pages 97 - 103

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

Abstract Multiple sclerosis (MS) is the leading cause of neurological disability among young adults. The disease-modifying treatments (DMTs) have been a breakthrough in the care of this patients, becoming a treatable disease. Today, we face a broad spectrum of treatment possibilities, which should be used rationally to provide the maximum benefit for the patients. In the context of the introduction of ocrelizumab as a treatment option in the Mexican MS DMT portfolio, a group of neurologists was convened to analyze the potential transition among DMT from their experience, through a desk research and expert opinion. As a result, here we describe the different considerations suggested for switching from different DMT to ocrelizumab that includes profiling studies, washout periods, and follow-up considerations. We concluded that the switch from other DMT previously used to ocrelizumab could be convenient and safe, as long as there is an adequate selection and profiling of the patients.

Resumen La esclerosis múltiple (EM) es la principal causa neurológica de discapacidad en adultos jóvenes. Los tratamientos modificadores de la enfermedad (TME) han representado un enorme avance en su atención y han convertido a la EM en una enfermedad tratable. Hoy día nos enfrentamos a un amplio espectro de posibilidades de tratamientos, que deben ser utilizados de forma racional para brindar el mayor beneficio a los pacientes. En el contexto de la introducción del ocrelizumab al mercado mexicano se convocó a un grupo de neurólogos con el fin de analizar la transición terapéutica desde diferentes ópticas, con base en la experiencia del grupo convocado con el uso de TME, realizando una investigación documental y de opinión de expertos. Como resultado se describen los diferentes aspectos para considerar el cambio de diferentes moléculas previamente usadas a ocrelizumab, así como los estudios de perfilamiento sugeridos, el tiempo de eliminación para cada molécula, los tiempos de lavado necesarios para cada molécula y los estudios de seguimiento necesarios. Se concluye que el cambio de las TME presentes a ocrelizumab puede resultar conveniente y seguro, siempre y cuando exista una adecuada selección y perfilamiento de los pacientes.

https://doi.org/10.24875/rmn.20000153 17 downloads

Effect of xylanase, cellulase and natural maguey extract on the chemical composition of corn silage and in vitro rumen gas production
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Martínez, José Ramón Pascual Franco

; Huerta, Andrés González

; López, Delfina de Jesús Pérez

; Cuevas, Rodolfo Serrato

; Salem, Abdelfattah Zeidan Mohamed

; Robles-Jimenez, Lizbeth E.

; Gonzalez-Ronquillo, Manuel

International journal of agriculture and natural resources

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apr 2020, Volume 47 N. 1 Pages 23 - 34

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

Abstract This study considered the application of two exogenous enzymes, xylanase (XYL) and cellulase (CELL), and maguey extract (ME), (applying 1 ml per kg as fresh matter) and a control (without additive) in four maize silage varieties (San Diego, Cacahuacintle, P-1832 and Victoria), to investigate their effect on the chemical composition (CC), gas production (GP) and in vitro ruminal fermentation. The GP was measured at 0, 3, 6, 9, 12, 24, 36, 48, 72 and 96 hours of incubation. Dry matter disappearance (DMD), organic matter disappearance (OMD), metabolizable energy (ME), and short chain fatty acids (SCFAs) were determined after 96 h of incubation. Data were analyzed using a completely randomized design with a 4×4 factorial arrangement with three replications. The CC showed a significant effect (P<0.05) for varieties with the exception of organic matter (OM), and the inclusion of additives increased the dry matter (DM) and crude protein (CP). A significant effect (P<0.01) was observed for the varieties in the GP parameters and ruminal fermentation. The addition of XYL, CEL and ME promoted dry matter degradation and increased energy availability, with increased in vitro gas production.

Resumen El estudio consideró la aplicación de dos enzimas exógenas: xilanasa (XYL) y celulasa (CELL), y extracto de maguey (EM) (aplicando 1 ml por kg de materia fresca) y Control (sin aditivo) en cuatro variedades de ensilaje de maíz (San Diego, Cacahuacintle, P −1832 y Victoria), para investigar su efecto sobre la composición química (CQ), la producción de gas (PG) y la fermentación ruminal in vitro. La PG fue medida a las 0, 3, 6, 9, 12, 24, 36, 48, 72 y 96 horas de incubación. La materia seca desaparecida (MSD), la materia orgánica desaparecida (MOD), la energía metabolizable (EM) y los ácidos grasos de cadena corta (AGCC) se determinaron después de 96 h de incubación. Los datos se analizaron mediante un diseño completamente al azar con arreglo factorial 4×4 con tres repeticiones. La CQ mostró un efecto significativo (P<0.05) para las variedades, con excepción de la materia orgánica (MO), la inclusión de aditivos incremento la materia seca (MS) y la proteína cruda (PC). Se observó un efecto significativo (P <0.01) para las variedades en los parámetros de PG y la fermentación ruminal. La adición de XYL, CEL y EM promueve la degradación de la MS y aumenta la disponibilidad de energía, con una mayor producción de gas in vitro.

https://doi.org/10.7764/ijanr.v47i1.2128 432 downloads

Degradabilidad y producción de metano in vitro del follaje de árboles y arbustos con potencial en la nutrición de rumiantes
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Pérez-Can, Genesis Ester

; Tzec-Gamboa, Magnolia

; Albores-Moreno, Samuel

; Sanginés-García, José

; Aguilar-Urquizo, Edgar

; Chay-Canul, Alfonso

; Canul-Solis, Jorge

; Muñoz-Gonzalez, Juan

; Diaz-Echeverria, Victor

; Piñero-Vázquez, Angel Trinidad

Acta universitaria

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2020, Volume 30 elocation e2840

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

Abstract The objective of the study was to determine the nutritional value, ruminal fermentation, and in vitro methane production of foliage of tree and shrubs species with forage potential as feeding strategies in dry season and mitigation of methane emissions. The rumen liquor was taken by an esophageal tube. A repeated block design overtime was used. The content of crude protein (CP) and neutral and acid detergent fiber ranged from 6.14% to 21.78%, 44.34% to 77.43% and 16.12% to 49.53% of dry matter (DM). No difference was found in the maximum volume of gas (p > 0.05). The degradability was different among species, and it was higher for Tithonia diversifolia (760.40 g/kg DM), Morus alba (800.66 g/kg DM) and Hibuscus rosa-sinensis (800.16 g/kg DM), whilst the lower was for Megathyrsus maximus (390.40 g/kg DM and 287.40 g/kg organic matter (OM)) (p < 0.05). No difference in methane (CH4) production was observed (p > 0.05). It is concluded that L. leucocephala, P. piscipula, B. alicastrum and G. ulmifolia, T. diversifolia, and M. alba have a high potential to be included in the ruminant diet as sources of protein in the dry season and strategies to mitigate methane emissions.

Resumen El objetivo del estudio fue determinar el valor nutritivo, la fermentación ruminal y la producción de metano in vitro del follaje de especies arbóreas y arbustivas con potencial forrajero como estrategias de alimentación en época de secas y mitigación de las emisiones de metano. El líquido ruminal fue extraído por medio de una sonda esofágica. Se utilizó un diseño en bloques repetidos en el tiempo. El contenido de proteína cruda (PC) y fibra detergente neutro y acida fluctuaron de 6.14% a 21.78, 44.34% a 77.43% y 16.12% a 49.53% de materia seca (MS). No se encontró diferencia en el volumen máximo de gas (p > 0.05). La degradabilidad fue diferente, observando la mejor en Tithonia diversifolia (760.40 g/kg de MS), Morus alba (800.66 g/kg de MS) y Hibiscus rosa-sinensis (800.16 g/kg de MS), mientras que la más baja fue Megatryrsus maximus (390.40 g/kg de MS y 287.40 g/kg de materia orgánica (MO)) (p < 0.05). No se observó diferencia en la producción de metano (CH4) (p > 0.05). Se concluye que L. leucocephala, P. piscipula, B. alicastrum y G. ulmifolia, T. diversifolia y M. alba tienen un alto potencial para ser incluidos en la dieta de rumiantes como fuentes de proteína en época de secas y estrategias para mitigar las emisiones de metano.

https://doi.org/10.15174/au.2020.2840 336 downloads

Análise dos Parâmetros de Polaridade Negativa do Processo MAG-PV sobre Distorções Angulares
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Gonzalez, Arnaldo Ruben

; Machado, Ivan Guerra

; Tomazi, Augusto

Soldagem & Inspeção

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2020, Volume 25 elocation e2503

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo: O objetivo deste trabalho é entender a influência da polaridade negativa no processo de soldagem MAG Polaridade Variável, em particular para aplicações de revestimento. Para isso foram escolhidos individualmente os parâmetros da polaridade negativa e analisados em relação à distorção angular da junta soldada, utilizando aço ao carbono como metal base e aço inoxidável como metal de adição. Foi aplicada a metodologia de superfície de resposta e o projeto de experimentos Box-Behnken no planejamento e execução do experimento, variando três fatores: tempo de corrente de base positiva, tempo de corrente negativa e corrente negativa, em três níveis cada um. Os três parâmetros principais avaliados apresentaram efeito significativo sobre a distorção angular. O menor valor de distorção angular foi obtido para o tempo da corrente de base positiva (15 ms), tempo de corrente negativa (15 ms) e intensidade de corrente negativa (-50 A). Todos eles apresentaram efeitos significativos no resultado final, responsável pelo menor valor de distorção angular, aproximadamente 0,02748 rad. Posteriormente, foi realizada a validação do modelo matemático para o alvo de menor valor da distorção angular estimado, o erro (%) entre os resultados da distorção angular estimada mediante a equação de regressão e o experimento foi de 3,65%

Abstract: It is intended to understand the influence of negative polarity on MAG variable polarity manufacturing process, in particular for coating applications, for that the negative polarity parameters were chosen individually and evaluated according to the angular distortion of the welded joint using carbon as base metal and stainless steel as filler metal. The response surface methodology and the Box-Behnken design of experiments were applied in the design and execution of the experiment varying three factors: base current time, negative current time and negative current, in three levels each. The three main parameters evaluated had a significant effect on angular distortion. The lowest angular distortion value was obtained with a positive base current time of 15 ms, negative current time of 15 ms and negative current intensity of -50 A. All of which had significant effects on the final result, responsible for the lowest angle of distortion of approximately 0,02748 rad. Subsequently, a validation of the mathematical model was performed with the lowest estimated angular distortion value. The error (%) between the estimated angular distortion through the regression equation and the experiment was 3.65%.

https://doi.org/10.1590/0104-9224/si25.03 1072 downloads

Early prognostic value of an Algorithm based on spectral Variables of Ventricular fibrillAtion from the EKG of patients with suddEn cardiac death: A multicentre observational study (AWAKE)
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Palacios-Rubioa, Julián

; Marina-Breysse, Manuel

; Quintanilla, Jorge G.

; Gil-Perdomo, José Miguel

; Juárez-Fernández, Miriam

; Garcia-Gonzalez, Inés

; Rial-Bastón, Verónica

; Corcobado, María Carmen

; Espinosa, María Carmen

; Ruiz, Francisco

; Gómez-Mascaraque Pérez, Francisco

; Bringas-Bollada, María

; Lillo-Castellano, José María

; Pérez-Castellano, Nicasio

; Martínez-Sellés, Manuel

; López de Sá, Esteban

; Martín-Benítez, Juan Carlos

; Perez-Villacastín, Julián

; Filgueiras-Rama, David

Archivos de cardiología de México

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2018, Volume 88 N. 5 Pages 460 - 467

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

Abstract Objective: Ventricular fibrillation (VF)-related sudden cardiac death (SCD) is a leading cause of mortality and morbidity. Current biological and imaging parameters show significant limitations on predicting cerebral performance at hospital admission. The AWAKE study (NCT03248557) is a multicentre observational study to validate a model based on spectral ECG analysis to early predict cerebral performance and survival in resuscitated comatose survivors. Methods: Data from VF ECG tracings of patients resuscitated from SCD will be collected using an electronic Case Report Form. Patients can be either comatose (Glasgow Coma Scale GCS --- ≤8) survivors undergoing temperature control after return of spontaneous circulation (RoSC), or those who regain consciousness (GCS = 15) after RoSC; all admitted to Intensive Cardiac Care Units in 4 major university hospitals. VF tracings prior to the first direct current shock will be digitized and analyzed to derive spectral data and feed a predictive model to estimate favorable neurological performance (FNP). The results of the model will be compared to the actual prognosis. Results: The primary clinical outcome is FNP during hospitalization. Patients will be categorized into 4 subsets of neurological prognosis according to the risk score obtained from the predictive model. The secondary clinical outcomes are survival to hospital discharge, and FNP and survival after 6 months of follow-up. The model-derived categorisation will be also compared with clinical variables to assess model sensitivity, specificity, and accuracy. Conclusions: A model based on spectral analysis of VF tracings is a promising tool to obtain early prognostic data after SCD.

Resumen Objetivo: La muerte súbita (MS) por fibrilación ventricular (FV) es una importante causa de morbilidad y mortalidad. Los métodos biológicos y de imagen actuales muestran limitaciones para predecir el pronóstico cerebral al ingreso hospitalario. AWAKE es un estudio observacional, multicéntrico, con el objetivo de validar un modelo basado en el análisis espectral del elec- trocardiograma (ECG), que predice precozmente el pronóstico cerebral y la supervivencia en pacientes resucitados y en estado de coma. Métodos: Se recogerán datos de los ECG con FV de pacientes reanimados de MS. Los pacientes pueden ser tanto supervivientes en estado de coma (Glasgow Coma Scale GCS ≤ 8) sometidos a control de temperatura tras la recuperación de circulación espontánea (RCE), como aquellos que recuperan la consciencia (GCS = 15) tras RCE; todos ellos ingresados en unidades de terapia intensiva cardiológica de 4 hospitales de referencia. Los registros de FV previos al primer choque se digitalizarán y analizarán para obtener datos espectrales que se incluirán en un modelo predictivo que estime el pronóstico neurológico favorable (PNF). El resultado del modelo se comparará con el pronóstico real. Resultados: El objetivo principal es el PNF durante la hospitalización. Los pacientes se categorizarán en 4 subgrupos de pronóstico neurológico según la estimación de riesgo obtenida en el modelo predictivo. Los objetivos secundarios son supervivencia al alta hospitalaria, y PNF y supervivencia a los 6 meses. El resultado de este modelo también se comparará con el pronóstico según variables clínicas. Conclusiones: Un modelo basado en el análisis espectral de registros de FV es una herramienta prometedora para obtener datos pronósticos precoces tras MS por FV.

https://doi.org/10.1016/j.acmx.2018.05.003 143 downloads

I Diretriz de Ressuscitação Cardiopulmonar e Cuidados Cardiovasculares de Emergência da Sociedade Brasileira de Cardiologia
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Gonzalez, MM

; Timerman, S

; Gianotto-Oliveira, R

; Polastri, TF

; Canesin, MF

; Schimidt, A

; Siqueira, AW

; Pispico, A

; Longo, A

; Pieri, A

; Reis, A

; Tanaka, ACS

; Santos, AM

; Quilici, AP

; Ribeiro, ACL

; Barreto, ACP

; Pazin-Filho, A

; Timerman, A

; Machado, CA

; Franchin Neto, C

; Miranda, CH

; Medeiros, CR

; Malaque, CMS

; Bernoche, C

; Gonçalves, DM

; Sant'Ana, DG

; Osawa, EA

; Peixoto, E

; Arfelli, E

; Evaristo, EF

; Azeka, E

; Gomes, EP

; Wen, FH

; Ferreira, FG

; Lima, FG

; Mattos, FR

; Galas, FG

; Marques, FRB

; Tarasoutchi, F

; Mancuso, FJN

; Freitas, GR

; Feitosa-Filho, GS

; Barbosa, GC

; Giovanini, GR

; Miotto, HC

; Guimarães, HP

; Andrade, JP

; Oliveira-Filho, J

; Fernandes, JG

; Moraes Junior, JBMX

; Carvalho, JJF

; Ramires, JAF

; Cavalini, JF

; Teles, JMM

; Lopes, JL

; Lopes, LNGD

; Piegas, LS

; Hajjar, LA

; Brunório, L

; Dallan, LAP

; Cardoso, LF

; Rabelo, MMN

; Almeida, MFB

; Souza, MFS

; Favarato, MH

; Pavão, MLRC

; Shimoda, MS

; Oliveira Junior, MT

; Miura, N

; Filgueiras Filho, NM

; Pontes-Neto, OM

; Pinheiro, PAPC

; Farsky, OS

; Lopes, RD

; Silva, RCG

; Kalil Filho, R

; Gonçalves, RM

; Gagliardi, RJ

; Guinsburg, R

; Lisak, S

; Araújo, S

; Martins, SCO

; Lage, SG

; Franchi, SM

; Shimoda, T

; Accorsi, TD

; Barral, TCN

; Machado, TAO

; Scudeler, TL

; Lima, VC

; Guimarães, VA

; Sallai, VS

; Xavier, WS

; Nazima, W

; Sako, YK

Arquivos Brasileiros de Cardiologia

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aug 2013, Volume 101 N. 2 Pages 1 - 221

Abstract: Pt | Text: Pt | PDF: Pt

https://doi.org/10.5935/abc.2013S006 554620 downloads

Effect of morphological heterogeneity of somatic embryos of Melia azedarach on conversion into plants
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Vila, Silvia

; Gonzalez, Ana

; Rey, Hebe

; Mroginski, Luis

Biocell

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apr 2010, Volume 34 N. 1 Pages 7 - 13

Abstract: En | Text: En | PDF: En

Embryogenic cultures were initiated from immature Melia azedarach (Meliaceae) zigotic embryos. Explants were induced on Murashige and Skoog (1962) medium with 4.54 μM thidiazuron or 0.45 μM dichlorophenoxyacetic acid. After 6 weeks of culture on induction medium, somatic embryos were categorized in four morphological classes based on the presence of single or fused embryos and if they remained united or not to the original explant; that were evaluated histologically. The somatic embryos of every category were transferred, in groups or individually, on a 1/4 MS medium. Bipolar embryos, the more typically normal ones, had well defined shoot and root apical meristems and produced single plants; subcultured individually their conversion was 28%, and subcultured in groups the conversion declined to 6.8%. Fused embryos subcultured in groups had only a 2.1% conversion and produced plants with fused stems. None conversion rate in the others classes was associated to poorly developed shoot and root meristematic areas or with their absence. The converted plants were acclimatized and transferred, in a mist, to soil, with an independent of the class 95% survival rate.

440 downloads Cited 1 time in SciELO

Laboratory evaluation of the effects of triflumuron on the development of Rhodnius prolixus nymph
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Mello, CB

; Mendonça-Lopes, D

; Feder, D

; Uzeda, CD

; Carneiro, RM

; Rocha, MA

; Gonzalez, MS

Memórias do Instituto Oswaldo Cruz

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dec 2008, Volume 103 N. 8 Pages 839 - 842

Abstract: En | Text: En | PDF: En

Studies were carried out to evaluate the efficacy of the growth regulator, triflumuron (TFM) (Starycide® sc 480 Bayer), for disrupting the development of Rhodnius prolixus fifth-instar nymph by oral, topical or continuous treatment. All treatments were able to induce high levels of mortality, delay development and molt inhibition. Oral treatment induced molt inhibition in all insects that survived at doses of 0.25, 0.50 and 5.0 mg/mL of a blood meal. The highest levels of both mortality in 24 h and molt inhibition were always observed after topical treatment. The lowest doses needed to obtain considerable biological effects were always observed after continuous treatment. In this way, the highest levels of mortality within 30 days were detected after continuous treatment, which also induced an extended inter-molting period, a lower number of over-aged nymphs and the highest level of molting in nymphs that survived. Moreover, the effects of TFM on insects were often displayed in a dose response manner. These results indicate that TFM acts as a potent growth inhibitor of R. prolixus nymphs and has the potential to be used in integrated vector control programs against hematophagous triatomine species.

1819 downloads Cited 3 times in SciELO

10.

Effect of blood components, abdominal distension, and ecdysone therapy on the ultrastructural organization of posterior midgut epithelial cells and perimicrovillar membranes in Rhodnius prolixus
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Albuquerque-Cunha, JM

; Mello, CB

; Garcia, ES

; Azambuja, P

; Souza, W de

; Gonzalez, MS

; Nogueira, NFS

Memórias do Instituto Oswaldo Cruz

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dec 2004, Volume 99 N. 8 Pages 815 - 822

Abstract: En | Text: En | PDF: En

The effects of blood components, nerve-cord severance, and ecdysone therapy on the posterior midgut epithelial cells of 5th-instar Rhodnius prolixus nymphs 10 days after feeding were analyzed by transmission electron microscopy. Cutting the nerve-cord of the blood-fed insects partially reduced the development of microvilli and perimicrovillar membranes (PMM), and produced large vacuoles and small electrondense granules; insects fed on Ringer's saline diet exhibited well developed microvilli and low PMM production; swolled rough endoplasmatic reticulum and electrondense granules; Ringer's saline meal with ecdysone led to PMM development, glycogen particles, and several mitochondria in the cytoplasm; epithelial cells of the insects fed on Ringer's saline meal whose nerve-cord was severed showed heterogeneously distributed microvilli with reduced PMM production and a great quantity of mitochondria and glycogen in the cytoplasm; well developed microvilli and PMM were observed in nerve-cord severed insects fed on Ringer's saline meal with ecdysone; Ringer's saline diet containing hemoglobin recovered the release of PMM; and insects fed on human plasma showed slightly reduced PMM production, although the addition of ecdysone in the plasma led to a normal midgut ultrastructural organization. We suggest that the full development of microvilli and PMM in the epithelial cells depends on the abdominal distension in addition to ingestion of hemoglobin, and the release of ecdysone.

2229 downloads Cited 1 time in SciELO

11.

Locomotor activity of Phalerisida maculata Kulzer (Coleoptera, Tenebrionidae) on Chilean sandy beaches
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JARAMILLO, EDUARDO

; AVELLANAL, MARIA H

; GONZALEZ, MARCIA

; KENNEDY, FERGUS

Revista chilena de historia natural

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mar 2000, Volume 73 N. 1 Pages 67 - 77

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

The locomotor activity of the beetle Phalerisida maculata Kulzer (Coleoptera Tenebrionidae) was studied on the surface of the substrate in two sandy beaches of the Chilean coast: one in north central (ca. 29ºS) and the other in south central Chile (ca.39ºS). During the summer period of 1991 the circadian locomotor activity was studied in the southern beach, while during that of 1997 in both beaches. To analyze the activity, pitfall traps were used which were ordered along two transects extended between the upper beach and the resurgence zone. The traps were checked (i.e. collection of captured insects) every two hours for a total period of 26 hours. The results showed that the adults of P. maculata were mostly active during the night hours, whereas the larvae were active during both, the day and night. Studies carried out in the beach located in south central Chile show that differences in the tidal range (neap vs. spring tides) do not affect the activity patterns. During the locomotor activity, adult and larvae move to lower intertidal levels than those usually occupied while buried. Results of laboratory experiments using actographs under conditions of darkness and constant temperature, suggest that adults and larvae of P. maculata presented a circadian rhythm similar to that observed in the field experiments. It is concluded that P. maculata presents a behaviour that appear to be under control of an endogenous rhythm, without showing differences in the circadian rhythm of activity when beaches located at different latitudes are compared

Se estudió la actividad locomotriz del escarabajo Phalerisida maculata Kulzer (Coleoptera, Tenebrionidae) sobre la superficie del sustrato de dos playas arenosas de la costa de Chile: una en el centro norte (ca. 29ºS) y otra en el centro sur (ca. 39ºS). Durante el período estival de 1991 se estudió la actividad locomotriz circadiana en la playa del centro sur y durante el de 1997 en ambas playas. Para analizar dicha actividad, se usaron trampas ordenadas a lo largo de dos transectos extendidos entre el borde superior de la playa y la zona de resurgencia. Las trampas se revisaron (i.e. recolección de insectos capturados) cada dos horas por un período total de 26 horas. Los resultados mostraron que los adultos de P. maculata fueron activos mayoritariamente durante las horas de oscuridad, mientras que las larvas fueron activas durante el día y la noche. Estudios llevados a cabo en la playa localizada en el centro sur de Chile, mostraron que las diferencias en el rango mareal (período de sicigia vs. cuadratura) no afectan los patrones de actividad. Durante la actividad locomotriz, adultos y larvas se desplazan a niveles ms bajos de los que ocupan habitualmente cuando están enterrados. Los resultados de experimentos de laboratorio realizados con actógrafos bajo condiciones de oscuridad y temperatura constante, sugieren que adultos y larvas de P. maculata presentan un ritmo circadiano similar al observado en los experimentos de terreno. Se concluye entonces que P. maculata presenta un comportamiento de actividad que pareciera estar bajo control endógeno, no presentando diferencias en el ritmo circadiano de actividad cuando se comparan playas ubicadas en diferentes latitudes

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12.

Biological factors involving Trypanosoma cruzi life cycle in the invertebrate vector, Rhodnius prolixus
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Garcia, ES

; Gonzalez, MS

; Azambuja, P

Memórias do Instituto Oswaldo Cruz

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- SciELO Analytics

sep 1999, Volume 94 Suppl. 1 Pages 213 - 216

Abstract: En | Text: En | PDF: En

2833 downloads Cited 5 times in SciELO

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