1,627 research outputs found
Bryophyte diversity patterns in flooded and tierra firme forests in the Araracuara Region, Colombian Amazonia
We investigated patterns of bryophyte species richness and composition in two forest types of Colombian Amazonia, non-flooded tierra firme forest and floodplain forest of the Caquetá River. A total of 109 bryophyte species were recorded from 14 0.2 ha plots. Bryophyte life forms and habitats were analyzed, including the canopy and epiphylls. Bryophyte species did not show significant differences between landscapes but mosses and liverworts were different and with opposite responses balancing the overall richness. Independence test showed differences in both life form and habitat use distribution between the two forest types with more fan and mat bryophytes species in the floodplains, and more epiphytic liverworts in the tierra firme forest. Correspondence analysis showed differences in the bryophyte species assemblage between the two forest types where they may be responding to the higher humidity provided by the flooding. Despite of, the environmental differences detected, epiphyll species assemblages were not strongly affected. Apparently, epiphyll habitat is stressful enough to hide the environmental differences between the flooded and Tierra firme forests.Investigamos los patrones de riqueza de especies y composición florÃstica de briofitos en dos tipos de bosque en la AmazonÃa Colombiana. Bosques no inundados de Tierra firme y bosques periódicamente inundados en los planos inundables del Rió Caquetá. Encontramos 109 especies de briofitos en 14 parcelas de 0.2 ha. Nosotros analizamos diferencias en la distribución de formas de vida y hábitat de los briofitos entre los dos tipos de bosque incluyendo especies del dosel y epifilas. El número de especies de briofitos no mostró diferencias significativas entre los dos tipos de bosque. Pero musgos y hepáticas si tuvieron diferencias con respuestas opuestas balanceando el número total de especies. Pruebas de independencia mostraron diferencias en la distribución de formas de vida y uso de hábitat entre los dos tipos de bosque con más especies de abanicos y esteras en los planos inundables, y más especies de hepáticas epifitas en el bosque de Tierra firme. El análisis de correspondencia mostró diferencias en la composición florÃstica de briofitos entre ambos tipos de bosque, donde las comunidades de briofitos pueden estar respondiendo a un gradiente de humedad aportada por la inundación periódica de los planos inundables. La composición florÃstica de los briofitos epifilos no mostró una separación tan clara entre los tipos de bosque como si fue detectada en los otros hábitat donde los briofitos fueron encontrados. Aparentemente, el hábitat epifilo es suficientemente estresante para ocultar el efecto de las diferentes condiciones ambientales de los bosques inundables y de Tierra firme
Evaluation of the parallel computational capabilities of embedded platforms for critical systems
Modern critical systems need higher performance which cannot be delivered by the simple architectures used so far. Latest embedded architectures feature multi-cores and GPUs, which can be used to satisfy this need. In this thesis we parallelise relevant applications from multiple critical domains represented in the GPU4S benchmark suite, and perform a comparison of the parallel capabilities of candidate platforms for use in critical systems. In particular, we port the open source GPU4S Bench benchmarking suite in the OpenMP programming model, and we benchmark the candidate embedded heterogeneous multi-core platforms of the H2020 UP2DATE project, NVIDIA TX2, NVIDIA Xavier and Xilinx Zynq Ultrascale+, in order to drive the selection of the research platform which will be used in the next phases of the project. Our result indicate that in terms of CPU and GPU performance, the NVIDIA Xavier is the highest performing platform
Desenvolvendo habilidades por meio da educomunicação
Trabalho apresentado no 31º SEURS - Seminário de Extensão Universitária da Região Sul, realizado em Florianópolis, SC, no perÃodo de 04 a 07 de agosto de 2013 - Universidade Federal de Santa Catarina
Dynamics of singular complex analytic vector fields with essential singularities II
The singular complex analytic vector fields on the Riemann sphere
belonging to the family , where is monic, , ,
, have a finite number of poles on the complex plane and an isolated
essential singularity at infinity (for ). Our aim is to describe
geometrically , particularly the singularity at infinity. We use the natural
one to one correspondence between , a global singular analytic distinguished
parameter , and the Riemann
surface of this distinguished parameter. We introduce
-configuration trees which are weighted directed rooted trees. An
-configuration tree completely encodes the Riemann surface and the singular flat metric associated on . The
-configuration trees provide "parameters" for the complex manifold
, which give explicit geometrical and dynamical information;
a valuable tool for the analytic description of .
Furthermore, given , the phase portrait of the associated real vector field
on the Riemann sphere is decomposed into -invariant components:
half planes and finite height strips. The germ of at infinity is described
as a combinatorial word (consisting of hyperbolic, elliptic, parabolic and
entire angular sectors having the point at infinity of
as center). The structural stability, under perturbation in , of the phase portrait of is characterized by using the
-configuration trees. We provide explicit conditions, in terms of
and , as to when the number of topologically equivalent phase portraits of
is unbounded.Comment: 82 pages, 25 figure
On the kinetic and allosteric regulatory properties of the ADP-glucose pyrophosphorylase from Rhodococcus jostii: An approach to evaluate glycogen metabolism in oleaginous bacteria
Rhodococcus spp. are oleaginous bacteria that accumulate glycogen during exponential growth. Despite the importance of these microorganisms in biotechnology, little is known about the regulation of carbon and energy storage, mainly the relationship between glycogen and triacylglycerols metabolisms. Herein, we report the molecular cloning and heterologous expression of the gene coding for ADP-glucose pyrophosphorylase (EC 2.7.7.27) of Rhodococcus jostii, strain RHA1. The recombinant enzyme was purified to electrophoretic homogeneity to accurately characterize its oligomeric, kinetic, and regulatory properties. The R. jostii ADP-glucose pyrophosphorylase is a homotetramer of 190 kDa exhibiting low basal activity to catalyze synthesis of ADP-glucose, which is markedly influenced by different allosteric effectors. Glucose-6P, mannose-6P, fructose-6P, ribose-5P, and phosphoenolpyruvate were major activators; whereas, NADPH and 6P-gluconate behaved as main inhibitors of the enzyme. The combination of glucose-6P and other effectors (activators or inhibitors) showed a cross-talk effect suggesting that the different metabolites could orchestrate a fine regulation of ADP-glucose pyrophosphorylase in R. jostii. The enzyme exhibited some degree of affinity toward ATP, GTP, CTP, and other sugar-1P substrates. Remarkably, the use of glucosamine-1P was sensitive to allosteric activation. The relevance of the fine regulation of R. jostii ADP-glucose pyrophosphorylase is further analyzed in the framework of proteomic studies already determined for the bacterium. Results support a critical role for glycogen as a temporal reserve that provides a pool of carbon able of be re-routed to produce long-term storage of lipids under certain conditions.Fil: Cereijo, Antonela EstefanÃa. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Santa Fe. Instituto de AgrobiotecnologÃa del Litoral. Universidad Nacional del Litoral. Instituto de AgrobiotecnologÃa del Litoral; ArgentinaFil: Asención Diez, MatÃas Damián. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Santa Fe. Instituto de AgrobiotecnologÃa del Litoral. Universidad Nacional del Litoral. Instituto de AgrobiotecnologÃa del Litoral; ArgentinaFil: Dávila Costa, José Sebastián. Universidad Nacional de la Patagonia Austral. Centro de Investigaciones y Transferencia Golfo San Jorge. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro de Investigaciones y Transferencia Golfo San Jorge. Universidad Nacional de la Patagonia ; ArgentinaFil: Alvarez, Hector Manuel. Universidad Nacional de la Patagonia Austral. Centro de Investigaciones y Transferencia Golfo San Jorge. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro de Investigaciones y Transferencia Golfo San Jorge. Universidad Nacional de la Patagonia ; ArgentinaFil: Iglesias, Alberto Alvaro. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Santa Fe. Instituto de AgrobiotecnologÃa del Litoral. Universidad Nacional del Litoral. Instituto de AgrobiotecnologÃa del Litoral; Argentin
A study linking patient EHR data to external death data at Stanford Medicine
This manuscript explores linking real-world patient data with external death
data in the context of research Clinical Data Warehouses (r-CDWs). We
specifically present the linking of Electronic Health Records (EHR) data for
Stanford Health Care (SHC) patients and data from the Social Security
Administration (SSA) Limited Access Death Master File (LADMF) made available by
the US Department of Commerce's National Technical Information Service (NTIS).
The data analysis framework presented in this manuscript extends prior
approaches and is generalizable to linking any two cross-organizational
real-world patient data sources. Electronic Health Record (EHR) data and NTIS
LADMF are heavily used resources at other medical centers and we expect that
the methods and learnings presented here will be valuable to others. Our
findings suggest that strong linkages are incomplete and weak linkages are
noisy i.e., there is no good linkage rule that provides coverage and accuracy.
Furthermore, the best linkage rule for any two datasets is different from the
best linkage rule for two other datasets i.e., there is no generalization of
linkage rules. Finally, LADMF, a commonly used external death data resource for
r-CDWs, has a significant gap in death data making it necessary for r-CDWs to
seek out more than one external death data source. We anticipate that
presentation of multiple linkages will make it hard to present the linkage
outcome to the end user.
This manuscript is a resource in support of Stanford Medicine STARR (STAnford
medicine Research data Repository) r-CDWs. The data are stored and analyzed as
PHI in our HIPAA-compliant data center and are used under research and
development (R&D) activities of STARR IRB.Comment: 20 page
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