39 research outputs found
Additional file 6: of PCK1 negatively regulates cell cycle progression and hepatoma cell proliferation via the AMPK/p27Kip1 axis
No full textPCK1 inhibits hepatoma growth in a subcutaneous xenograft mouse model. (JPG 3699 kb
Loss of coral reef growth capacity to track future increases in sea level
No full textSea-level rise (SLR) is predicted to elevate water depths above coral reefs and to increase coastal wave exposure as ecological degradation limits vertical reef growth, but projections lack data on interactions between local rates of reef growth and sea level rise. Here we calculate the vertical growth potential of more than 200 tropical western Atlantic and Indian Ocean reefs, and compare these against recent and projected rates of SLR under different Representative Concentration Pathway (RCP) scenarios. Although many reefs retain accretion rates close to recent SLR trends, few will have the capacity to track SLR projections under RCP4.5 scenarios without sustained ecological recovery, and under RCP8.5 scenarios most reefs are predicted to experience mean water depth increases of more than 0.5 m by 2100. Coral cover strongly predicts reef capacity to track SLR, but threshold cover levels that will be necessary to prevent submergence are well above those observed on most reefs. Urgent action is thus needed to mitigate climate, sea-level and future ecological changes in order to limit the magnitude of future reef submergence
Site level data on projected Western Atlantic coral reef accretion rates and SST-OA projections (dataset)
No full textNo description availabl
Post-bleaching coral community change on southern Maldivian reefs: is there potential for rapid recovery?
No full textGiven the severity of the 2016 global bleaching event there are major questions about how quickly reef communities will recover. Here we explore the ecological and physical structural changes that occurred across five atoll interior reefs in the southern Maldives using data collected at 6 and 12 months post-bleaching. Following initial severe coral mortality, further minor coral mortality had occurred by 12 months post-bleaching, and coral cover is now low (<6 %). In contrast, reef rugosity has continued to decline over time, and our observations suggest transitions to rubble-dominated states will occur in the near future. Juvenile coraldensities are also exceptionally low (< 6 indiv. m-2), well below those measured 9-12 months following the 1998 bleaching event, and below recovery thresholds identified on other Indian Ocean reefs. Our findings suggest that the physical structure of these reefs will need to decline further before effective recruitment and recovery can begin
La seducción del continente americano. Simbolismo e ideología en La piedra que crece, de Albert Camus
No full textEn el cuento "La piedra que crece" Albert Camus textualiza de manera sugerente, la seducción que el continente americano, en su porción más agreste y natural, adquiere para este pensador de mediados del siglo pasado. Continente y cultura que parecen ofrecer al escritor francés una posible salida a ese universo cerrado, sin horizontes, que postula el Existencialismo. Este cuento se erige como símbolo contenedor de ideas tangenciales a las manifestadas por Camus en el resto de sus escritos. Aquí se advierte una mirada esperanzada acerca del porvenir de la cultura y, en definitiva, de la humanidad que le da sentido, que se contrapone diametralmente con la postura existencialista. Por ello en este trabajo me propongo, por una parte transmitir una impresión de lectura, y por otra, demostrar de qué manera la captación de un espacio-otro, adquiere una dimensión simbólica e ideológica que socava los postulados existenciales en sus raíces más profundasIn the short story "The growing stone", Albert Camus insinuantingly textualizes the seduction that the American continent, in its wildest and most natural portion, acquires for this thinker of the mid-twentieth century. Both the continetn and its culture seem to offer the French writer a way out from the closed, horizonless universe postulated by Existentialism. This story emerges a a symbol containing ideas tangential to those manifested by Camus in his other writings. Here we can notice a hopeful view on the future of culture and, above all, of the humanity which gives it sense. This opposes systematically Exitencialist beliefs. In this paper I aim, on the one hand, at transmitting an impression of the reading and, on the other, at proving how the apprehension of an other-space acquires a symbolic and ideological dimension which undermines the deepest roots of existentialism.Fil: Sales de Nasser, Dolly.
Universidad Nacional de Cuy
Bleaching drives collapse in reef carbonate budgets and reef growth potential on southern Maldives reefs
No full textSea-surface temperature (SST) warming events, which are projected to increase in frequency and intensity with climate change, represent major threats to coral reefs. How these events impact reef carbonate budgets, and thus the capacity of reefs to sustain vertical growth under rising sea levels, remains poorly quantified. Here we quantify the magnitude of changes that followed the ENSO-induced SST warming that affected the Indian Ocean region in mid-2016. Resultant coral bleaching caused an average 75% reduction in coral cover (present mean 6.2%). Most critically we report major declines in shallow fore-reef carbonate budgets, these shifting from strongly net positive (mean 5.92 G, where G = kg CaCO3 m−2 yr−1) to strongly net negative (mean −2.96 G). These changes have driven major reductions in reef growth potential, which have declined from an average 4.2 to −0.4 mm yr−1. Thus these shallow fore-reef habitats are now in a phase of net erosion. Based on past bleaching recovery trajectories, and predicted increases in bleaching frequency, we predict a prolonged period of suppressed budget and reef growth states. This will limit reef capacity to track IPCC projections of sea-level rise, thus limiting the natural breakwater capacity of these reefs and threatening reef island stability
Identifying a taxonomy for the emergence of metacognition in young learners
No full textThis paper details a study of upper primary (elementary) students’ thinking as they go about solving a problem, presented in an innovative computer program. Student responses to a metacognitive probe question reveal levels of responses that can be classified because of their shared quality. A thematic analysis was conducted with the initial classifications being based on theoretically derived categories from the metacognitive literature. These classifications were subsequently ordered into a taxonomy of hierarchical progression towards metacognition. Results in this instance indicated that less than 20% of these upper primary students showed they were capable of operating at a metacognitive level
A quick, easy and non-invasive method to quantify coral growth rates using photogrammetry and 3D model comparisons (dataset)
No full textThis is the dataset used for the Lange et al. (2020) article "A quick, easy and non-invasive method to quantify coral growth rates using photogrammetry and 3D model comparisons" published in Methods in Ecology & Evolution
Teacher subject specialisms and their relationships to learning styles, psychological types and multiple intelligences: implications for course development
No full textThis study explores issues in teacher education that increase our understanding of, and response to, the individual differences displayed by learners. A large undergraduate teacher education cohort provided evidence of the range and distribution of preferences in learning styles, psychological types and multiple intelligences. This information revealed that distributions of scores on the Kolb Learning Style Inventory, the Myers-Briggs Type Indicator, and the Multiple Intelligences Checklist for Adults provide evidence about the scope and range of differences between four teacher subject specialisms. This rich information about those participating in teacher education courses provides some guidance for educating those with their own clear preferences to the range of different preferences expressed by many other learners and highlights the existence of four sets of major differences in approaches to teaching and learning in prospective teachers. <br
A quick, easy and non-invasive method to quantify coral growth rates using photogrammetry and 3D model comparisons (article)
No full text1. Coral growth rates vary significantly with environmental conditions and are thus important indicators of coral health and reef carbonate production. Despite the importance of this metric, data are sparse for most coral genera and species globally, including for many key reef-building species. Traditional methods to obtain growth rates, such as coral coring or staining with Alizarin are destructive and only work for a limited number of species and morphological growth forms.
2. Emerging approaches, using underwater photogrammetry to create digital models of coral colonies, are providing novel and non-invasive ways to explore colony-scale growth patterns and to address existing knowledge gaps. We developed an easy-to-follow workflow to construct 3D models from overlapping photographs and to measure linear, radial and vertical extension rates of branching, massive and encrusting corals after aligning colony models from subsequent years.
3. The method presented here was applied to measure extension rates for 46 colonies of nine coral species in the remote Chagos Archipelago, Indian Ocean. Proposed
image acquisition and software settings produced 3D models of consistently high resolution and detail (precision ≤0.2 mm) and variability in growth measurements was small despite manual alignment, clipping and ruler placement (standard deviation ≤0.9 mm). Measured extension rates for the Chagos Archipelago are similar to published rates in the Indo-Pacific where comparable data is available, and provide the first published rates for several species. For encrusting corals, the results emphasize the importance of differentiating between radial and vertical growth.
4. Photogrammetry and 3D model comparisons provide a fast, easy, inexpensive and non-invasive method to quantify coral growth rates for a range of species and morphological growth forms. The simplicity of the presented workflow encourages its repeatability and permits non-specialists to learn photogrammetry with the goal of obtaining linear coral growth rates. Coral growth rates are essential metrics to quantify functional consequences of ongoing community changes on coral reefs and expanded datasets for key coral taxa will aid predictions of geographic variations in coral reef
response to increasing global stressor
