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Search Results: 1 - 10 of 439 matches for " Marites Canto "
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Host-Specific Interactions with Environmental Factors Shape the Distribution of Symbiodinium across the Great Barrier Reef
Linda Tonk, Eugenia M. Sampayo, Scarla Weeks, Marites Magno-Canto, Ove Hoegh-Guldberg
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068533
Abstract: Background The endosymbiotic dinoflagellates (genus Symbiodinium) within coral reef invertebrates are critical to the survival of the holobiont. The genetic variability of Symbiodinium may contribute to the tolerance of the symbiotic association to elevated sea surface temperatures (SST). To assess the importance of factors such as the local environment, host identity and biogeography in driving Symbiodinium distributions on reef-wide scales, data from studies on reef invertebrate-Symbiodinium associations from the Great Barrier Reef (GBR) were compiled. Methodology/Principal Findings The resulting database consisted of 3717 entries from 26 studies. It was used to explore ecological patterns such as host-specificity and environmental drivers structuring community complexity using a multi-scalar approach. The data was analyzed in several ways: (i) frequently sampled host species were analyzed independently to investigate the influence of the environment on symbiont distributions, thereby excluding the influence of host specificity, (ii) host species distributions across sites were added as an environmental variable to determine the contribution of host identity on symbiont distribution, and (iii) data were pooled based on clade (broad genetic groups dividing the genus Symbiodinium) to investigate factors driving Symbiodinium distributions using lower taxonomic resolution. The results indicated that host species identity plays a dominant role in determining the distribution of Symbiodinium and environmental variables shape distributions on a host species-specific level. SST derived variables (especially SSTstdev) most often contributed to the selection of the best model. Clade level comparisons decreased the power of the predictive model indicating that it fails to incorporate the main drivers behind Symbiodinium distributions. Conclusions/Significance Including the influence of different host species on Symbiodinium distributional patterns improves our understanding of the drivers behind the complexity of Symbiodinium-invertebrate symbioses. This will increase our ability to generate realistic models estimating the risk reefs are exposed to and their resilience in response to a changing climate.
Satellite-Derived Photic Depth on the Great Barrier Reef: Spatio-Temporal Patterns of Water Clarity
Scarla Weeks,P. Jeremy Werdell,Britta Schaffelke,Marites Canto,Zhongping Lee,John G. Wilding,Gene C. Feldman
Remote Sensing , 2012, DOI: 10.3390/rs4123781
Abstract: Detecting changes to the transparency of the water column is critical for understanding the responses of marine organisms, such as corals, to light availability. Long-term patterns in water transparency determine geographical and depth distributions, while acute reductions cause short-term stress, potentially mortality and may increase the organisms’ vulnerability to other environmental stressors. Here, we investigated the optimal, operational algorithm for light attenuation through the water column across the scale of the Great Barrier Reef (GBR), Australia. We implemented and tested a quasi-analytical algorithm to determine the photic depth in GBR waters and matched regional Secchi depth (ZSD) data to MODIS-Aqua (2002–2010) and SeaWiFS (1997–2010) satellite data. The results of the in situ ZSD/satellite data matchup showed a simple bias offset between the in situ and satellite retrievals. Using a Type II linear regression of log-transformed satellite and in situ data, we estimated ZSD and implemented the validated ZSD algorithm to generate a decadal satellite time series (2002–2012) for the GBR. Water clarity varied significantly in space and time. Seasonal effects were distinct, with lower values during the austral summer, most likely due to river runoff and increased vertical mixing, and a decline in water clarity between 2008–2012, reflecting a prevailing La Ni?a weather pattern. The decline in water clarity was most pronounced in the inshore area, where a significant decrease in mean inner shelf ZSD of 2.1 m (from 8.3 m to 6.2 m) occurred over the decade. Empirical Orthogonal Function Analysis determined the dominance of Mode 1 (51.3%), with the greatest variation in water clarity along the mid-shelf, reflecting the strong influence of oceanic intrusions on the spatio-temporal patterns of water clarity. The newly developed photic depth product has many potential applications for the GBR from water quality monitoring to analyses of ecosystem responses to changes in water clarity.
Environmental Factors Controlling the Distribution of Symbiodinium Harboured by the Coral Acropora millepora on the Great Barrier Reef
Timothy F. Cooper, Ray Berkelmans, Karin E. Ulstrup, Scarla Weeks, Ben Radford, Alison M. Jones, Jason Doyle, Marites Canto, Rebecca A. O'Leary, Madeleine J. H. van Oppen
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0025536
Abstract: Background The Symbiodinium community associated with scleractinian corals is widely considered to be shaped by seawater temperature, as the coral's upper temperature tolerance is largely contingent on the Symbiodinium types harboured. Few studies have challenged this paradigm as knowledge of other environmental drivers on the distribution of Symbiodinium is limited. Here, we examine the influence of a range of environmental variables on the distribution of Symbiodinium associated with Acropora millepora collected from 47 coral reefs spanning 1,400 km on the Great Barrier Reef (GBR), Australia. Methodology/Principal Findings The environmental data included Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data at 1 km spatial resolution from which a number of sea surface temperature (SST) and water quality metrics were derived. In addition, the carbonate and mud composition of sediments were incorporated into the analysis along with in situ water quality samples for a subset of locations. Analyses were conducted at three spatio-temporal scales [GBR (regional-scale), Whitsunday Islands (local-scale) and Keppel Islands/Trunk Reef (temporal)] to examine the effects of scale on the distribution patterns. While SST metrics were important drivers of the distribution of Symbiodinium types at regional and temporal scales, our results demonstrate that spatial variability in water quality correlates significantly with Symbiodinium distribution at local scales. Background levels of Symbiodinium types were greatest at turbid inshore locations of the Whitsunday Islands where SST predictors were not as important. This was not the case at regional scales where combinations of mud and carbonate sediment content coupled with SST anomalies and mean summer SST explained 51.3% of the variation in dominant Symbiodinium communities. Conclusions/Significance Reef corals may respond to global-scale stressors such as climate change through changes in their resident symbiont communities, however, management of local-scale stressors such as altered water quality is also necessary for maintenance of coral-Symbiodinium associations.
Morphological and Physiological Responses of Weedy Red Rice (Oryza sativa L.) and Cultivated Rice (O. sativa) to N Supply  [PDF]
Marites A. Sales, Nilda R. Burgos, Vinod K. Shivrain, Brad Murphy, Edward E. Gbur
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.24068
Abstract: Red rice (Oryza sativa L.), a noxious weed in rice production, competes with cultivated rice for nutrients. Accumulation of more N in red rice than in cultivated rice may be due to a mechanism different from that of cultivated rice. To test this assumption, red rice and cultivated rice were grown in nutrient solution to compare their growth and physiological responses to N supply. Experimental design was a split-plot, where main plot factor was rice type (Stf-3, ‘Wells’); split-plot factor was N treatment [T1 (complete nutrient solution); T2 (–NH4NO3); T3 (+NH4NO3 for 24-h post-N deficiency); and T4 (+NH4NO3 for 48-h post-N deficiency)]. Nitrogen deficiency was defined as N sufficiency index (NSI) < 95%. Height, tiller number, biomass, and root morphology were monitored to determine morphological responses. Stf-3 red rice had significantly greater growth measurements than Wells in terms of shoot and root characteristics. At T4, Stf-3 showed higher increment in root length and surface area than Wells. Shoot tissue concentrations of N and total sugars were measured to determine physiological response in N-deficient and N-supplemented plants. Stf-3 had greater N and sucrose tissue concentrations at N-deficient conditions compared with Wells, implying a stress-adaptive molecular mechanism regulated by N and sucrose availability.
Phytochemical Composition, Antioxidant and Antibacterial Properties of Pummelo (Citrus maxima (Burm.)) Merr. against Escherichia coli and Salmonella typhimurium  [PDF]
Aimee Sheree A. Barrion, Wilma A. Hurtada, Irene A. Papa, Teofila O. Zulayvar, Marites G. Yee
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.59085
Abstract:


The antioxidant and antibacterial activities of the phytochemical constituents of the pericarp, mesocarp and segment membrane crude ethanolic extracts of Pummelo (Citrus maxima (Burm.)) fruit were were tested against Escherichia coli and Salmonella typhimurium. Preliminary phytochemical test revealed the presence of phenols, tannins, saponins expressed as catechine quivalent (CE)/100ml and flavonoid expressed as gallic acid equivalent (GAE)/100ml. The order of which was as follows pericarp > segment membrane > mesocarp. The strongest antioxidant activity was obtained by the pericarp extract (29.64 expressed as % lipid peroxidation). The differences in the measured amount of phytochemicals and antioxidant activity among the three sample extracts were found to be significant. In terms of antimicrobial activity, the pericarp, mesocarp and segment membrane extracts generated zone of inhibitions measuring 17.10, 18.00 and 17.03 mm for S. typhimurium, respectively at 100% concentration. E. coli was noted to be inactive in all three sample extracts at 100% concentration. The capacity of E. coli to counteract the inhibitory effect of the phytochemicals contained in the pummelo extracts may be attributed to its rough corrugated cell wall and thick periplasmic space as opposed to the smooth curved and barely seen periplasmic space of S. typhimurium. However, no significant correlation was detected among the phytochemical content, antioxidant and in vitro antimicrobial activities of the sample extracts against S. typhimurium.


Rinoplastia en la nariz mestiza y negroide: una preocupación de todos
Canto Vidal,Bernaldo; Canto Vigil,Tania;
MediSur , 2010,
Abstract: background: there are many mestizos and black inhabitants in the cuban population who from an economic stand-point, have a highly important percentage. many of them feel the need to improve their faces aesthetically by means of the operative correction of their nose deformities known as rhinoplasty. objective: to assess the results of rhinoplasties in mestizos and black patients. methods: prospective study carried out in 52 mestizos and black patients who attended the maxillo-facial surgery outpatient of the university hospital ?dr. gustavo aldereguía lima? from 2006 to 2009. all mestizos were treated with an open technique in which three types of v incisions, inverted v and transversal v incisions were used. in the transoperative process 2cc of triamsinolone were infiltrated, with the aim to avoid keloid formation and other techniques were combined with it. digital photos were also used during the preparation of the cases either at the pre and post surgical stages as a way of evidencing the results. results: 42 patients were mestizos, 20 of them were females and 22 males; 10 patients were black, 7 of them females and 3 males. all the patients were highly satisfied with the result of their surgery. there were no complications in these patients conclusions: the use of the v technique for the surgical treatment of the mestizos and black noses is effective and the use of triamsinolone avoids keloid formation.
Rhinoplasty in Mestizo and Black Noses Rinoplastia en la nariz mestiza y negroide
Bernaldo Canto Vidal,Tania Canto Vigil
MediSur , 2010,
Abstract: Background: There are many mestizos and black inhabitants in the Cuban population who from an economic stand-point, have a highly important percentage. Many of them feel the need to improve their faces aesthetically by means of the operative correction of their nose deformities known as rhinoplasty. Objective: To assess the results of rhinoplasties in mestizos and black patients. Methods: prospective study carried out in 52 mestizos and black patients who attended the Maxillo-Facial Surgery Outpatient of the University Hospital “Dr. Gustavo Aldereguía Lima” from 2006 to 2009. All mestizos were treated with an open technique in which three types of V incisions, inverted V and transversal V incisions were used. In the transoperative process 2cc of Triamsinolone were infiltrated, with the aim to avoid keloid formation and other techniques were combined with it. Digital photos were also used during the preparation of the cases either at the pre and post surgical stages as a way of evidencing the results. Results: 42 patients were mestizos, 20 of them were females and 22 males; 10 patients were black, 7 of them females and 3 males. All the patients were highly satisfied with the result of their surgery. There were no complications in these patients Conclusions: The use of the V technique for the surgical treatment of the mestizos and black noses is effective and the use of Triamsinolone avoids keloid formation. Fundamento: en nuestro país existe una población mestiza y negroide que alcanza un por ciento de considerable importancia desde el punto de vista socio-económico. Muchos de ellos sienten la necesidad de mejorar la estética de su rosto mediante la rinoplastia. Objetivo: evaluar los resultados de las rinoplastias en pacientes mestizos y negroides. Métodos: estudio retrospectivo realizado en 52 pacientes mestizos y negroides que concurrieron a consulta de cirugía máxilo facial del Hospital General Universitario “Dr. Gustavo Aldereguía Lima” en el período comprendido desde el a o 2006 al 2009. Todos los pacientes mestizos se trataron por la técnica abierta en la que se utilizaron tres tipos de incisiones en V, en V invertida y transversal. En el transoperatorio se inflirtraron 2cc de triamcinolona, con el propósito de evitar el queloide, además se combinaron otras técnicas en alas nasales. Se utilizó la fotografía digital en la preparación de los casos tanto en el preoperatorio como en el posoperatorio para la evidencia de los resultados. Resultados: cuarenta y dos pacientes eran mestizos, 20 del sexo femenino, 22 del masculino; 10 pacientes eran negroide
Competitividad y cohesión social: el caso de la industria del vestido en Yucatán
Canto Sáenz, Rodolfo;
Estudios sociales (Hermosillo, Son.) , 2011,
Abstract: the article takes the view that competitiveness and social cohesion are complementary variables. in yucatan non-inclusive models of economic growth have prevailed: the production of sisal during the twentieth century and the maquiladora industry for export, particularly clothing, in the last two decades. currently, the maquiladoras are leaving yucatan; nearly 100 companies have closed down and around twenty thousand jobs have been lost; however, there remain about two thousand micro and small businesses from the garment industry which are an important economic asset. the paper explores the possibility of moving towards an inclusive model of economic development that simultaneously promotes competitiveness (efficiency) and social cohesion (equity) in the garment industry with a resolute policy of promoting the development of technological capabilities and the formation of human capital, as an objective basis for improving workers' income and quality of life.
Gobernanza y participación ciudadana en las políticas públicas frente al reto del desarrollo
Canto Chac, Manuel;
Política y cultura , 2008,
Abstract: in latin america, the emphasis on public policy approach has changed, by means of replacing the old positions by technocratic approaches in order to rescue and update the old and never resolved tensions between politics and policies. in contemporary discussions, attention has been given not only in the formulation but also to the political process, recognizing that categories of policies are influenced by the various policy approaches. this paper links the discussions of citizen participation and governance, from a democracy, human rights and development perspective in latin america.
Contribui??es da psicologia social para o psicólogo na saúde coletiva
Zurba, Magda do Canto;
Psicologia & Sociedade , 2011, DOI: 10.1590/S0102-71822011000400002
Abstract: in this study we have tried to understand the collective health through the modes of subjectivity related to the production of symptoms.the central focal point consists in understanding the creation and maintenance of patterns of sickness/health within everyday life. we identified potential treatment options for the psychologist within the context of health. accordingly, we identify epistemological aspects of practicing psychology based on a socio-historical concept of the subject. therefore, drawing on the premise of symptoms as a form of language, we propose a model of psychological intervention appropriate to the national politics of mental health, highlighting strategies of action for sus (sistema único de saúde or brazil's universal health care system) on three levels of patient-health complexity: low, medium, and highly complex. each level of psychological treatment in healthcare can be understood based on a dialectic understanding of the construction of the subject and the corresponding production of symptoms.
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