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La Corona: un acercamiento a las políticas del reino Kaan desde un centro secundario del noroeste del Petén
Canuto, Marcello A.;Barrientos Q., Tomás;
Estudios de cultura maya , 2011,
Abstract: the la corona regional archaeological project is studying the northwestern peten region (guatemala), where the ancient maya city of la corona is located. this site has been recently identified as the unknown site q. the research at la corona has included excavations of monumental and settlement architecture, mapping, use of remote sensing and ecological and paleo-climate studies. viewed from the political organization models, investigations at la corona present an opportunity to study the nature and political relations of secondary sites. epigraphic data show a direct affiliation between la corona and the ruling dynasty of calakmul, suggesting that la corona could have been a key center for the expansionistic strategies of calakmul during the sixth and seventh centuries a.d. in this paper we present some of the results obtained in the investigations carried out between 2005 and 2009.
La Corona: un acercamiento a las políticas del reino Kaan desde un centro secundario del noroeste del Petén La Corona: an approach to politics in the kingdom of Kaan from a secondary center in Norwest Petén
Marcello A. Canuto,Tomás Barrientos Q.
Estudios de cultura maya , 2011,
Abstract: El Proyecto Regional Arqueológico La Corona estudia la región del noroeste de Petén, Guatemala, donde se localiza la antigua ciudad maya de La Corona, que recientemente fue identificada como el Sitio Q. La investigación ha incluido las excavaciones de arquitectura monumental, asentamientos, la elaboración de mapas, el uso de sensores remotos y la realización de estudios paleoclimatológicos y ecológicos. Desde el punto de vista de los modelos de la organización política, las investigaciones en La Corona presentan una oportunidad para estudiar la naturaleza y las relaciones políticas de los sitios secundarios. Los datos epigráficos relatan una afiliación directa entre La Corona y la dinastía gobernante en Calakmul, por lo que el primer centro seguramente fungió como punto clave para las estrategias de expansión de Calakmul por las Tierras Bajas Mayas durante los siglos VI y VII d.C. Aquí se presentan algunos resultados obtenidos en las investigaciones llevadas al cabo entre 2005 y 2009. The La Corona Regional Archaeological Project is studying the northwestern Peten region (Guatemala), where the ancient Maya city of La Corona is located. This site has been recently identified as the unknown Site Q. The research at La Corona has included excavations of monumental and settlement architecture, mapping, use of remote sensing and ecological and paleo-climate studies. Viewed from the political organization models, investigations at La Corona present an opportunity to study the nature and political relations of secondary sites. Epigraphic data show a direct affiliation between La Corona and the ruling dynasty of Calakmul, suggesting that La Corona could have been a key center for the expansionistic strategies of Calakmul during the sixth and seventh centuries A.D. In this paper we present some of the results obtained in the investigations carried out between 2005 and 2009.
Extraordinary Findings in a Case of Self-inflicted Cutaneous Lesions
Alexandre Jack Dwan,Ana Claudia Grizzo Peres Martins,Cyro Festa Neto,Marcello Menta Simonsen Nico,Maria Julia Canuto
- , 2017, DOI: 10.2340/00015555-2680
Abstract: Abstract is missing (Short communication)
Apoptosis in Trypanosomatids: Evolutionary and phylogenetic considerations
Barcinski, Marcello A.;
Genetics and Molecular Biology , 1998, DOI: 10.1590/S1415-47571998000100005
Abstract: programmed cell death (pcd) or apoptosis, an active process of cell death, plays a central role in normal tissue development and organogenesis, as well as in the pathogenesis of different diseases. although it occurs in diverse cells and tissues under the influence of a remarkable variety of inducing agents, the resultant ultrastructural and biochemical changes are extremely monotonous, indicating the existence of a common biological mechanism underlying its occurrence. it is generally accepted that a developmental program leading to cell death cannot be advantageous to unicellular organisms and that pcd appeared in evolution to fulfill the organizational needs of multicellular life. however, the recent description of apoptotic death occurring in three different species of pathogenic kinetoplastids suggests that the evolutionary origin of pcd precedes the appearence of multicellular organisms. the present study proposes that a population of pathogenic trypanosomatids is socially organized and that pcd is a prerequisite for this organization and for the fulfillment of the demands of a heteroxenic lifestyle. this proposal includes possible roles for pcd in the development of the parasite in the insect vector and/or in its mammalian host and suggests experimental strategies to localize the evolutionary origin of pcd within the kinetoplastids.
Apoptosis in Trypanosomatids: Evolutionary and phylogenetic considerations
Barcinski Marcello A.
Genetics and Molecular Biology , 1998,
Abstract: Programmed cell death (PCD) or apoptosis, an active process of cell death, plays a central role in normal tissue development and organogenesis, as well as in the pathogenesis of different diseases. Although it occurs in diverse cells and tissues under the influence of a remarkable variety of inducing agents, the resultant ultrastructural and biochemical changes are extremely monotonous, indicating the existence of a common biological mechanism underlying its occurrence. It is generally accepted that a developmental program leading to cell death cannot be advantageous to unicellular organisms and that PCD appeared in evolution to fulfill the organizational needs of multicellular life. However, the recent description of apoptotic death occurring in three different species of pathogenic kinetoplastids suggests that the evolutionary origin of PCD precedes the appearence of multicellular organisms. The present study proposes that a population of pathogenic Trypanosomatids is socially organized and that PCD is a prerequisite for this organization and for the fulfillment of the demands of a heteroxenic lifestyle. This proposal includes possible roles for PCD in the development of the parasite in the insect vector and/or in its mammalian host and suggests experimental strategies to localize the evolutionary origin of PCD within the kinetoplastids.
Mixed Layer Mesoscales for OGCMs: Model development and assessment with T/P, WOCE and Drifter data
V. M. Canuto,M. S. Dubovikov,A. Leboissetier
Physics , 2011,
Abstract: We present a model for mixed layer (ML) mesoscale (M) fluxes of an arbitrary tracer in terms of the resolved fields (mean tracer and mean velocity). The treatment of an arbitrary tracer, rather than only buoyancy, is necessary since OGCMs time step T, S, CO2, etc and not buoyancy. The particular case of buoyancy is used to assess the model results. The paper contains three parts: derivation of the results, discussion of the results and assessment of the latter using, among others, WOCE, T/P and Drifter data. Derivation. To construct the M fluxes, we first solve the ML M dynamic equations for the velocity and tracer M fields. The goal of the derivation is to emphasize the different treatments of the non-linear terms in the adiabatic vs. diabatic ocean (deep ocean vs. mixed layer). Results. We derive analytic expressions for the following variables: a) vertical and horizontal M fluxes of an arbitrary tracer, b) M diffusivity in terms of the EKE, c) surface value of the EKE in terms of the vertical M buoyancy flux together with a model for the z-profile of the M EKE, d) tapering function T(z) in terms of the large scale variables; vanishes at the surface and tends to unity below the ML where the stream function smoothly connects with the deep ocean GM form, e) new eddy induced velocity. Assessment. a) the vertical flux naturally vanishes at the ocean surface, as physically required, b) the second z-derivative of the buoyancy flux is negative, implying re-stratification, in agreement with eddy resolving simulations, c) the predicted surface EKE compares well with the T/P-Jason-1 altimetry data in both intensity and geographical distribution, d) the predicted z-profile of the EKE compares well with WOCE data, e) the model predicts both the z-profile and the surface values of the M diffusivity, f) the latter is in accord with the Global Drifter and T/P data.
A nova dinamica regional brasileira e uma agenda de pesquisas para o Paraná
Otaviano Canuto
Revista Paranaense de Desenvolvimento , 1998,
Abstract: This paper approaches some general features of regional development in Brazil since the beginning of the eighties. As a background to the new Brazilian regional economic dynamics, the text highlights some deep changes at the levels of both national and international economies. The focus lies upon the transformations in the forms of interaction among regions within Brazil which came simultaneously with new linkages between each one of the regions and the international economy. Special attention is given to Mercosur in this respect. As final considerations, the paper outlines a research agenda through which one might improve the understanding of Paraná’s economic performance as a by-product of the new Brazilian regional economic dynamics and of Paraná’s insertion within that dynamics. O artigo aborda alguns tra os gerais do desenvolvimento regional brasileiro a partir do início dos anos 80, cujo pano de fundo s o as profundas mudan as que desde ent o se processam nas economias nacional e internacional. O foco recai sobre as altera es ocorridas, durante o período, nas formas de intera o entre as regi es no Brasil e na articula o entre cada uma delas e o exterior, destacando-se neste caso o Mercosul. Como item final do texto, delineia-se uma proposta de agenda de pesquisas através da qual poder-se-ia atualizar a compreens o da economia paranaense a partir da nova dinamica regional brasileira e da especificidade de sua inser o estadual nessa dinamica.
Modo de elegir esposa entre los indios naturales del pueblo de San Gaspar, estado de México (1908)
Canuto Flores
Nueva antropología , 1982,
Abstract:
Stochastic Quintessence
Jerome Martin,Marcello A. Musso
Physics , 2004, DOI: 10.1103/PhysRevD.71.063514
Abstract: The behavior of the quintessence field is studied during inflation. In order to have a satisfactory model of dark energy, the quintessence field value today should be as insensible to the initial conditions as possible. Usually, only the dependence on the initial conditions specified at the end of inflation or, equivalently, at the beginning of the radiation dominated era, is considered. Provided the quintessence field is initially within a large but, crucially, finite interval, its present value becomes independent of the initial value it started from. The question as to whether inflation naturally drives the quintessence field to the above-mentioned interval is addressed. Since the quantum effects turn out to be important, the formalism of stochastic inflation is used in order to calculate the evolution of the quintessence field. Moreover, the quantum effects originating from the inflaton field are also taken into account and are proved to be sub-dominant in most cases. Finally, the requirement that the quintessence field is on tracks today is shown to imply quite tight constraints on the initial values of the quintessence and inflaton fields at the beginning of inflation. In particular, the initial value of the inflaton field cannot be too large which indicates that the quintessential scenario seems to be compatible with inflation only if the total number of e-folds is quite small.
Active Tectonics in Tuscany (Central Italy): Ten Years of Seismicity (2009-2019)  [PDF]
Marcello Viti
International Journal of Geosciences (IJG) , 2020, DOI: 10.4236/ijg.2020.1110032
Abstract: Strong earthquakes (moment magnitude MW ≥ 5.5) are uncommon in Tuscany and surroundings (central Italy). The last strong seismic event occurred a century ago (September 7, 1920 Garfagnana, MW = 6.53). The paucity of seismic instrumental recordings hinders the identification of the tectonic regime active in Tuscany. On the other hand, the geological and geomorphological pieces of evidence collected so far, concerning potential active and capable faults, are scarce, fragmentary and ambiguous. In this work I shed light on the active deformation of Tuscany by using two independent approaches: earthquake source mechanisms and GNSS (GPS) geodetic measurements. I have considered 41 small seismic events (MW ≤ 5.1) that occurred in the study area during the last decade. The related source mechanisms (retrieved by the Time Domain Moment Tensor method) define a relatively clear picture of the active deformation: extension along the northern Apennine watershed and strike-slip regime within inner Tuscany, up to the Tyrrhenian coast. This pattern broadly agrees with the horizontal strain field reconstructed by the geodetic velocity field. The latter has been constrained by a network of 840 GPS stations located in Italy and neighboring countries, operating in the last 20 years.
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