14 research outputs found
Vaux’s Swift migratory connectivity
No full textPopulations of Vaux’s Swift (Chaetura vauxi), like those of many aerial insectivores, are rapidly declining. Determining
when and where populations are limited across the annual cycle is important for their conservation. Establishing the
linkages between wintering and breeding sites and the strength of the connections between them is a necessary first
step. In this study, we analyzed 3 stable isotopes (δ13C, δ15N, δ2H) from feathers collected during spring migration from
Vaux’s Swifts that perished during a stopover on Vancouver Island, British Columbia, Canada. We previously analyzed
claw tissue (grown during winter) from the same individuals, revealing that the swifts likely wintered in 2 or 3 locations/
habitats. Here, we used stable isotope analysis of flight feathers presumed to have been grown on, or near, the breeding
grounds to determine the likely previous breeding locations and presumed destinations for the swifts. Stable isotope
values (δ13C, δ15N, δ2H) showed no meaningful variation between age classes, sexes, or with body size. Surprisingly, ~26%
of the birds sampled had feather isotope values that were not consistent with growth on their breeding grounds. For the
remaining birds, assigned breeding origins appeared most consistent with molt origins on Vancouver Island. Overall, migratory connectivity of this population was relatively weak (rM = 0.07). However, the degree of connectivity depended on
how many winter clusters were analyzed; the 2-cluster solution suggested no significant connectivity, but the 3-cluster
solution suggested weak connectivity. It is still unclear whether low migratory connectivity observed for Vaux’s Swift and
other aerial insectivores may make their populations more or less vulnerable to habitat loss; therefore, further efforts
should be directed to assessing whether aerial insectivores may be habitat limited throughout the annual cycle.Peer reviewedarticlespublishedVaux’s Swiftaerial insectivoresChaetura vauximigrationmigratory connectivitypopulation declinesstable isotopesstopove
Gestión administrativa para un programa social en una municipalidad, Lambayeque 2024
No full textLa presente investigación está alineado al Objetivo de Desarrollo Sostenible 2
(ODS2) Hambre Cero. Tuvo por objetivo, elaborar una propuesta de gestión
administrativa para un programa social en una municipalidad, Lambayeque 2024. La
metodología fue básica, cuantitativo y no experimental, descriptivo simple y
transversal. La población estuvo conformada por 24 colaboradores del área de
Desarrollo Social de la municipalidad, la misma que debido a la cantidad fue la
muestra, se aplicó la técnica de la encuesta y como instrumento un cuestionario de
24 preguntas. Resultados se encontró que la gestión de planificación es eficiente, al
igual que la gestión de organización, en la gestión de dirección se encontró que un
29.17% es regular y en la gestión del control, se encontró que un 4.17% es deficiente,
un 50.00% es regular y un 45.83% es eficiente. Conclusiones, dado que la gestión de
planificación y organización muestran eficiente, en la gestión de dirección hay mejoras
por hacer y más aún en la gestión de control, centrarse en fortalecer las prácticas y
procedimientos en aspectos como el control de talla y peso, y la formulación y
evaluación de las acciones del plan operativo mensual
Influencia en las propiedades físico - mecánicas del concreto fc=210 kg/cm2 al adicionar parcialmente cenizas de hueso de pescado - Lima, 2023
No full textEsta tesis de investigación se llevó a cabo con el propósito general de analizar cómo la adición parcial de cenizas de hueso de pescado (CHP) influye en las propiedades físico-mecánicas en el concreto f’c=210 kg/cm², en Lima. La metodología utilizada en el proyecto fue de tipo aplicativo y diseño cuasi experimental. Consistió en preparar un concreto convencional con resistencia de f'c=210 kg/cm2 y añadir porcentualmente CHP al 3%, 6% y 9% en relación con el peso del cemento, se hicieron 72 muestras para las pruebas de resistencia a la compresión, flexión y tracción a 7, 14 y 28 días de curado. Los resultados indican que a 28 días de curado con una adición del 9% de CHP, alcanzaron la resistencia a la compresión 250 kg/cm2 o un incremento del 19%, la resistencia a la flexión 2.03 MPa o un incremento del 10% y tracción a 2.18 MPa con un incremento del 10% con relación al concreto patrón. Sin embargo, el análisis estadístico demuestra que con adición del 3% es suficiente para alcanzar una buena resistencia a la tracción siendo mínimas las diferencias con 6% y 9% de adición. En conclusión, podemos decir que la propuesta es de viabilidad tanto en método de proyectos y análisis experimental, La optimización y mejora de producción del concreto con CHP pueden ser rentables y sustentables en el tiempo
Diseño de una planta de tratamiento de aguas industriales de los contrapozos de explotación petrolera mediante ósmosis inversa para Bioproyectos S.A.S.
No full textTrabajo de investigaciónEn el desarrollo del proyecto se realizó la caracterización del agua proveniente de los contrapozos petroleros, se tomaron parámetros fisicoquímicos como el pH, la turbidez, etc. Se optimizaron las sustancias químicas para la clarificación, teniendo en cuenta el porcentaje de remoción ≥80% para bajar la carga contaminante de sólidos, neutralización de parámetros antes de pasar por la unidad de ósmosis inversa; siendo esto un aporte para los costos de mantenimientos del equipo que lo conforma.PregradoIngeniero CivilINTRODUCCIÓN
1. PLANTEAMENTO DEL PROBLEMA
2. ANTECEDENTES Y JUSTIFICACIÓN
3. OBJETIVOS
4. ESTADO DEL ARTE
5. MARCO DE REFERENCIA
6. METODOLOGÍA
7. DESARROLLO
8. ALCANCE Y LIMITACIONES
9. INSTALACIONES Y EQUIPOS REQUERIDOS
10. CONCLUSIONES
11. RECOMENDACIONES
12. BIBLIOGRAFÍA
ANEXO
Right Inferior Frontal Gyrus Activation as a Neural Marker of Successful Lying
No full textThere is evidence to suggest that successful lying necessitates cognitive effort. We tested this hypothesis by instructing participants to lie or tell the truth under conditions of high and low working memory (WM) load. The task required participants to register a response on 80 trials of identical structure within a 2 (WM Load: high, low) × 2 (Instruction: truth or lie) repeated-measures design. Participants were less accurate and responded more slowly when WM load was high, and also when they lied. High WM load activated the fronto-parietal WM network including dorsolateral prefrontal cortex (PFC), middle frontal gyrus, precuneus, and intraparietal cortex. Lying activated areas previously shown to underlie deception, including middle and superior frontal gyrus and precuneus. Critically, successful lying in the high vs. low WM load condition was associated with longer response latency, and it activated the right inferior frontal gyrus—a key brain region regulating inhibition. The same pattern of activation in the inferior frontal gyrus was absent when participants told the truth. These findings demonstrate that lying under high cognitive load places a burden on inhibition, and that the right inferior frontal gyrus may provide a neural marker for successful lying
The effects of trauma exposure and posttraumatic stress disorder (PTSD) on the emotion-induced memory trade-off
No full textMany studies of memory changes in individuals with PTSD have focused on memory for trauma. However, it is unclear if these mnemonic differences extend beyond trauma memory to memory for other positive and negative information and if they are specific to individuals with PTSD or extend to other individuals who have experienced trauma. The present study examined the influences of trauma exposure and PTSD on an effect that may parallel tunnel memory in PTSD: the emotion-induced memory trade-off, whereby emotional aspects of an experience are remembered at the expense of the nonemotional context. Three groups (25 with current PTSD, 27 who had experienced trauma but did not have current PTSD, and 25 controls who had neither experienced significant trauma nor met criteria for current PTSD) were shown complex visual scenes that included an item (positive, negative, or neutral) placed on a neutral background. 45 minutes later, participants underwent a recognition memory test for the items and backgrounds separately. An emotion-induced memory trade-off was said to occur when there was a significant difference in item and background memory for emotional scenes, but not for neutral scenes. People with PTSD, like the other groups, were more likely to remember positive and negative items than neutral items. People with PTSD exhibited a memory trade-off, but this trade-off was no larger than for the non-trauma control group. Trauma-exposed people without a current diagnosis of PTSD did not show a trade-off, because they remembered the items within scenes better than their contexts even for neutral scenes. These results suggest that i) the effect of emotion on memory for visual scenes is similar in people with PTSD and control participants, and ii) people who have experienced trauma, but do not have PTSD, may have a different way of attending to and remembering visual scenes, exhibiting less of a memory trade-off than either control participants or people with PTSD
Development and Implementation of a Smartphone Application to Promote Physical Activity and Reduce Screen-time in Adolescent Boys
No full textPurpose: The primary aim is to describe the development and implementation of a smartphone application (app) designed to promote physical activity and reduce screen-time in adolescent boys ‘at risk’ of obesity from low-income communities.Methods: An app was developed to support the delivery of a face-to-face school-based obesity prevention program known as the ‘Active Teen Leaders Avoiding Screen-time’ (ATLAS) program. ATLAS was guided by self-determination theory and social cognitive theory and evaluated using a cluster randomized controlled trial with 361 boys (12.7± 0.5 years) in 14 secondary schools. Following the completion of the study, participants in the intervention group completed a process evaluation questionnaire and focus groups were conducted with 42 students to explore their general perceptions of the ATLAS program and their experience with the smartphone app. Barriers and challenges encountered in the development, implementation and evaluation of the app are also described.Results: Participation in the study was not contingent on ownership of a smartphone, but 70% of participants in the intervention group reported having access to a smartphone or tablet device. Focus group participants reported an enjoyment of the program, and felt that it had provided them with new skills, techniques, and routines for the future. However, their engagement with the smartphone app was limited, due to a variety of reasons. Barriers to the implementation and evaluation of the app included limited access to smartphone devices, technical problems with the push notifications, lack of access to usage data and the challenges of maintaining participants’ interest in using the app.Conclusions: Although participants reported high levels of satisfaction with the ATLAS program in general, the smartphone app was not used extensively. Additional strategies and features may be needed to enhance engagement in adolescent boys
Color and texture associations in voice-induced synesthesia
No full textVoice-induced synesthesia, a form of synesthesia in which synesthetic perceptions are induced by the sounds of people's voices, appears to be relatively rare and has not been systematically studied. In this study we investigated the synesthetic color and visual texture perceptions experienced in response to different types of “voice quality” (e.g., nasal, whisper, falsetto). Experiences of three different groups—self-reported voice synesthetes, phoneticians, and controls—were compared using both qualitative and quantitative analysis in a study conducted online. Whilst, in the qualitative analysis, synesthetes used more color and texture terms to describe voices than either phoneticians or controls, only weak differences, and many similarities, between groups were found in the quantitative analysis. Notable consistent results between groups were the matching of higher speech fundamental frequencies with lighter and redder colors, the matching of “whispery” voices with smoke-like textures, and the matching of “harsh” and “creaky” voices with textures resembling dry cracked soil. These data are discussed in the light of current thinking about definitions and categorizations of synesthesia, especially in cases where individuals apparently have a range of different synesthetic inducers
Genome sequencing reveals a new lineage associated with lablab bean and genetic exchange between Xanthomonas axonopodis pv. phaseoli and Xanthomonas fuscans subsp. fuscans.
No full textJournal ArticleThe Supplementary Material for this article can be found online at: http://journal.frontiersin.org/article/10.3389/fmicb.2015.01080Common bacterial blight is a devastating seed-borne disease of common beans that also occurs on other legume species including lablab and Lima beans. We sequenced and analyzed the genomes of 26 strains of Xanthomonas axonopodis pv. phaseoli and X. fuscans subsp. fuscans, the causative agents of this disease, collected over four decades and six continents. This revealed considerable genetic variation within both taxa, encompassing both single-nucleotide variants and differences in gene content, that could be exploited for tracking pathogen spread. The bacterial strain from Lima bean fell within the previously described Genetic Lineage 1, along with the pathovar type strain (NCPPB 3035). The strains from lablab represent a new, previously unknown genetic lineage closely related to strains of X. axonopodis pv. glycines. Finally, we identified more than 100 genes that appear to have been recently acquired by Xanthomonas axonopodis pv. phaseoli from X. fuscans subsp. fuscans.Biotechnology and Biological Sciences Research Council (BBSRC)Canadian International Development Agenc
Alzheimer’s Biomarkers are Correlated with Brain Connectivity in Older Adults Differentially during Resting and Task States
No full textß-amyloid (Aß) plaques and tau-related neurodegeneration are pathologic hallmarks of Alzheimer’s disease (AD). The utility of AD biomarkers, including those measured in cerebrospinal fluid (CSF), in predicting future AD risk and cognitive decline is still being refined. Here we explored potential relationships between functional connectivity patterns within the default-mode network (DMN), age, CSF biomarkers (Aß42 and pTau181) and cognitive status in older adults. Multiple measures of functional connectivity were explored including a novel time series based measure (Total Interdependence; TI). In our sample of 27 cognitively normal older adults, no significant associations were found between levels of Aß42 or pTau181 and cognitive scores or regional brain volumes. However, we observed several novel relationships between these biomarkers and measures of functional connectivity in DMN during both resting-state and a short-term memory task. First, increased connectivity between bilateral anterior middle temporal gyri was associated with higher levels of CSF Aβ42 and Aβ42/pTau181 ratio (reflecting lower AD risk) during both rest and task. Second, increased bilateral parietal connectivity during the short-term memory task, but not during rest, was associated with higher levels of CSF pTau181 (reflecting higher AD risk). Third, increased connectivity between left middle temporal and left parietal cortices during the active task was associated with decreased global cognitive status but not CSF biomarkers. Lastly, we found that our new TI method was more sensitive to the CSF Aβ42-connectivity relationship whereas the traditional cross-correlation method was more sensitive to levels of CSF pTau181 and cognitive status. With further refinement, resting-state connectivity and task-driven connectivity measures hold promise as non-invasive neuroimaging markers of Aβ and pTau burden in cognitively normal older adults
