A new species of Hyphessobrycon (Characiformes, Characidae) from the Esteros del Iberá wetlands, Argentina

Hyphessobrycon auca sp. n. is described from the Esteros del Iberá wetlands. Hyphessobrycon auca differs from the remaining species of the genus by the presence of one maxillary tooth with 5 cusps; dentary low with teeth decreasing in size anteroposteriorly; males with hooks in all fins; mature females with hooks on pelvic-fin rays; one humeral spot vertically elongated, bounded by a light area; a second lateral spot may be faint or well developed; a wide lateral band ending in a conspicuous caudal spot.Facultad de Ciencias Naturales y Muse

A new species of Hyphessobrycon (Characiformes, Characidae) from the Esteros del Iberá wetlands, Argentina

Hyphessobrycon auca sp. n. is described from the Esteros del Iberá wetlands. Hyphessobrycon auca differs from the remaining species of the genus by the presence of one maxillary tooth with 5 cusps; dentary low with teeth decreasing in size anteroposteriorly; males with hooks in all fins; mature females with hooks on pelvic-fin rays; one humeral spot vertically elongated, bounded by a light area; a second lateral spot may be faint or well developed; a wide lateral band ending in a conspicuous caudal spot.Facultad de Ciencias Naturales y Muse

Plan de mantenimiento preventivo para los equipos del taller de máquinas y herramientas de la empresa Servitec LTDA

El mantenimiento está directamente relacionado con la confiabilidad de los equipos, este es el fundamento de esta actividad, confiabilidad en que la planta funcionará continuamente sin paradas indeseadas evitando así pérdidas económicas. Toda empresa busca tener un departamento de mantenimiento, con personas involucradas directamente con esta actividad, el departamento de mantenimiento no debe actuar independiente de los demás departamentos de la empresa ya que el mantenimiento moderno necesita de la intervención de todos estos departamentos para hacer más ágil la solución de los problemas sin afectar la producción o la prestación del servicio de la empresa. Desde el mismo diseño de los equipos se debe contemplar el mantenimiento y la vida útil de los equipos. La vida útil representa el periodo de tiempo que trabajará en forma eficiente una máquina. Hay un punto a partir del cual mantenerla en operación representa un gasto superior a los beneficios que se obtienen. Administrar un buen mantenimiento es toda una empresa donde el Jefe debe gerenciar los recursos, optimizar su utilización, planear cada actividad crear los mecanismos de supervisión y control, crear los medios para retroalimentar el proceso y sobretodo crear una clara conciencia sobre la importancia de su actividad a todos los niveles de la empresa

Evaluation of Imazapyr herbicide efficiency in reduction of longitudinal residual strain in Eucalyptus dunnii

Este trabalho avaliou a eficiência do herbicida Imazapyr (“Chopper”) na redução de tensões de crescimento em árvores de Eucalyptus dunnii Maiden. Foram testadas 20 árvores de 14 anos em Canoinhas, SC. Este trabalho foi subdivido em duas etapas: 1 (calibração) e 2 (execução). Em ambas, fixaram-se dois pinos no DAP das árvores, um pino distante 45 mm do outro (fixados na direção da grã), para indicar a intensidade da deformação residual longitudinal (DRL). Após a calibragem do aparelho, foi feito um furo de2 cm de diâmetro, com um arco de pua, entre os dois pinos, com o objetivo de liberar as tensões e registrar as deformações. As deformações foram medidas sob dois tratamentos – testemunha e com uso de Imazapyr – e comparadas através de análise de variância, em três momentos (1, 15 e 30 dias após a aplicação do herbicida). Apesar de os resultados preliminares (0,103 e 0,135 mm, com e sem herbicida, respectivamente) terem apontado que o herbicida foi, estatisticamente, eficiente na redução das tensões de crescimento em toretes, na etapa 2 as médias em árvores em pé com aplicação de herbicida das três medições (0,131, 0,127 e 0,127 mm) apresentaram apenas uma tendência de queda da DRL.Palavras-chave: Tensões de crescimento; metodologias não destrutivas; eucalipto. AbstractEvaluation of Imazapyr herbicide efficiency in reduction of longitudinal residual strain in Eucalyptus dunnii. This research evaluated the efficiency of the systemic herbicide Imazapyr ("Chopper") in reduction of growth stress of Eucalyptus dunnii Maiden trees. We tested twenty 14-year-old trees in Canoinhas-SC. This research was divided in two stages: 1 (calibration) and 2 (execution). In both, we fixed two pins in the trees DBH: one pin 45 mm apart from each other, aiming to release tensions and register deformations. We measured deformations in two treatments – control and with Imazapyr – and compared it by variance analysis in three moments (1, 15 and 30 days before the herbicide application). Even though the preliminary results (0.103 e 0.135 mm, with and without herbicide, respectively) pointed that the herbicide was, statistically, efficient in the reduction of growth tensions in short logs, in the second stage, the averages in standing trees with application of herbicide of the three measurements (0.131; 0.127; and 0.127 mm) presented only a tendency to decrease in DRL.Keywords: Growth strain; non-destructive methods; eucalyptus.AbstractThis research evaluated the efficiency of the systemic herbicide Imazapyr ("Chopper") in reduction of growth stress of Eucalyptus dunnii Maiden trees. We tested twenty 14-year-old trees in Canoinhas-SC. This research was divided in two stages: 1 (calibration) and 2 (execution). In both, we fixed two pins in the trees DBH: one pin 45 mm apart from each other, aiming to release tensions and register deformations. We measured deformations in two treatments – control and with Imazapyr – and compared it by variance analysis in three moments (1, 15 and 30 days before the herbicide application). Even though the preliminary results (0.103 e 0.135 mm, with and without herbicide, respectively) pointed that the herbicide was, statistically, efficient in the reduction of growth tensions in short logs, in the second stage, the averages in standing trees with application of herbicide of the three measurements (0.131; 0.127; and 0.127 mm) presented only a tendency to decrease in DRL.Keywords: Growth strain; non-destructive methods; eucalyptus

A new species of Hyphessobrycon (Characiformes, Characidae) from the Esteros del Iberá wetlands, Argentina

Hyphessobrycon auca sp. n. is described from the Esteros del Iberá wetlands. Hyphessobrycon auca differs from the remaining species of the genus by the presence of one maxillary tooth with 5 cusps; dentary low with teeth decreasing in size anteroposteriorly; males with hooks in all fins; mature females with hooks on pelvic-fin rays; one humeral spot vertically elongated, bounded by a light area; a second lateral spot may be faint or well developed; a wide lateral band ending in a conspicuous caudal spot.Facultad de Ciencias Naturales y Muse

<i>Imparfinis mishky</i> (Siluriformes, Heptapteridae) a new species from the ríos Paraná and Uruguay basins in Argentina

Imparfinis mishky sp. n. is described from the río Paraná and río Uruguay basins in Argentina. Imparfinis mishky sp. n. is distinguished from other species of the genus by the following combination of characters: pectoral-fin spine with smooth anterior and posterior margins; caudal fin deeply forked with dorsal lobe longer than ventral lobe; adipose fin not reaching caudal fin; body with six dark saddles across the dorsum, and without a mid-lateral band. It was found inhabiting well oxygenated, neutral pH, flowing waters, with sandy or cobble covered bottom.Facultad de Ciencias Naturales y Muse

No effect of creatine supplementation on oxidative stress and cardiovascular parameters in spontaneously hypertensive rats

Background: Exacerbated oxidative stress is thought to be a mediator of arterial hypertension. It has been postulated that creatine (Cr) could act as an antioxidant agent preventing increased oxidative stress. The aim of this study was to investigate the effects of nine weeks of Cr or placebo supplementation on oxidative stress and cardiovascular parameters in spontaneously hypertensive rats (SHR). Findings: Lipid hydroperoxidation, one important oxidative stress marker, remained unchanged in the coronary artery (Cr: 12.6 +/- 1.5 vs. Pl: 12.2 +/- 1.7 nmol.mg(-1); p = 0.87), heart (Cr: 11.5 +/- 1.8 vs. Pl: 14.6 +/- 1.1 nmol.mg(-1); p = 0.15), plasma (Cr: 67.7 +/- 9.1 vs. Pl: 56.0 +/- 3.2 nmol.mg(-1); p = 0.19), plantaris (Cr: 10.0 +/- 0.8 vs. Pl: 9.0 +/- 0.8 nmol.mg(-1); p = 0.40), and EDL muscle (Cr: 14.9 +/- 1.4 vs. Pl: 17.2 +/- 1.5 nmol.mg(-1); p = 0.30). Additionally, Cr supplementation affected neither arterial blood pressure nor heart structure in SHR (p &gt; 0.05). Conclusions: Using a well-known experimental model of systemic arterial hypertension, this study did not confirm the possible therapeutic effects of Cr supplementation on oxidative stress and cardiovascular dysfunction associated with arterial hypertension.FAPES

Abnormal left and right amygdala-orbitofrontal cortical functional connectivity to emotional faces:state versus trait vulnerability markers of depression in bipolar disorder

Background - Amygdala-orbitofrontal cortical (OFC) functional connectivity (FC) to emotional stimuli and relationships with white matter remain little examined in bipolar disorder individuals (BD). Methods - Thirty-one BD (type I; n = 17 remitted; n = 14 depressed) and 24 age- and gender-ratio-matched healthy individuals (HC) viewed neutral, mild, and intense happy or sad emotional faces in two experiments. The FC was computed as linear and nonlinear dependence measures between amygdala and OFC time series. Effects of group, laterality, and emotion intensity upon amygdala-OFC FC and amygdala-OFC FC white matter fractional anisotropy (FA) relationships were examined. Results - The BD versus HC showed significantly greater right amygdala-OFC FC (p = .001) in the sad experiment and significantly reduced bilateral amygdala-OFC FC (p = .007) in the happy experiment. Depressed but not remitted female BD versus female HC showed significantly greater left amygdala-OFC FC (p = .001) to all faces in the sad experiment and reduced bilateral amygdala-OFC FC to intense happy faces (p = .01). There was a significant nonlinear relationship (p = .001) between left amygdala-OFC FC to sad faces and FA in HC. In BD, antidepressants were associated with significantly reduced left amygdala-OFC FC to mild sad faces (p = .001). Conclusions - In BD, abnormally elevated right amygdala-OFC FC to sad stimuli might represent a trait vulnerability for depression, whereas abnormally elevated left amygdala-OFC FC to sad stimuli and abnormally reduced amygdala-OFC FC to intense happy stimuli might represent a depression state marker. Abnormal FC measures might normalize with antidepressant medications in BD. Nonlinear amygdala-OFC FC–FA relationships in BD and HC require further study