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Search Results: 1 - 10 of 85402 matches for " Maria Cristina Dasso "
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Memorias y representaciones sobre el criollo del chaco argentino
Maria Cristina Dasso
Confluenze. Rivista di Studi Iberoamericani , 2010,
Abstract: In Argentina, the creole population has been appreciated or undervalued according to the dominant national political vision. Border situations and contact between descendants of former Spanish settlers and the indigenous peoples of the Chaco allowed the rise of mutual representations that dominate their discourse up to these days. In this regard, there are paintings belonging to the nineteenth and twentieth century whose data on the creole are relevant to contrast with the aboriginal representation of the specific rural creole settlers of Mision Nueva Pompeya and the places related to this village of the Chaco. Keywords: Argentina, creole, Chaco, paintings, memory. En la Argentina el criollo ha sido apreciado o subvalorado según la visión política nacional dominante. Las situaciones de frontera y contacto de los descendientes de espa oles con los aborígenes del Chaco permitieron hacer aflorar representaciones mutuas que dominan el discurso de las sociedades involucradas hasta hoy. Al respecto, hay pinturas realizadas en el siglo XIX y XX, cuyos datos criollos en general son relevantes para contrastar con la representación del criollo que tiene el aborigen, específicamente referido a la sociedad criolla rural de Misión Nueva Pompeya y parajes vinculados con esta localidad en la provincia del Chaco. Palabras claves: Argentina, criollo, Chaco, pinturas, memoria.
Analysis of Population Substructure in Two Sympatric Populations of Gran Chaco, Argentina
Federica Sevini, Daniele Yang Yao, Laura Lomartire, Annalaura Barbieri, Dario Vianello, Gianmarco Ferri, Edgardo Moretti, Maria Cristina Dasso, Paolo Garagnani, Davide Pettener, Claudio Franceschi, Donata Luiselli, Zelda Alice Franceschi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0064054
Abstract: Sub-population structure and intricate kinship dynamics might introduce biases in molecular anthropology studies and could invalidate the efforts to understand diseases in highly admixed populations. In order to clarify the previously observed distribution pattern and morbidity of Chagas disease in Gran Chaco, Argentina, we studied two populations (Wichí and Criollos) recruited following an innovative bio-cultural model considering their complex cultural interactions. By reconstructing the genetic background and the structure of these two culturally different populations, the pattern of admixture, the correspondence between genealogical and genetic relationships, this integrated perspective had the power to validate data and to link the gap usually relying on a singular discipline. Although Wichí and Criollos share the same area, these sympatric populations are differentiated from the genetic point of view as revealed by Non Recombinant Y Chromosome genotyping resulting in significantly high Fst values and in a lower genetic variability in the Wichí population. Surprisingly, the Amerindian and the European components emerged with comparable amounts (20%) among Criollos and Wichí respectively. The detailed analysis of mitochondrial DNA showed that the two populations have as much as 87% of private haplotypes. Moreover, from the maternal perspective, despite a common Amerindian origin, an Andean and an Amazonian component emerged in Criollos and in Wichí respectively. Our approach allowed us to highlight that quite frequently there is a discrepancy between self-reported and genetic kinship. Indeed, if self-reported identity and kinship are usually utilized in population genetics as a reliable proxy for genetic identity and parental relationship, in our model populations appear to be the result not only and not simply of the genetic background but also of complex cultural determinants. This integrated approach paves the way to a rigorous reconstruction of demographic and cultural history as well as of bioancestry and propensity to diseases of Wichí and Criollos.
Expansion of magnetic clouds in the outer heliosphere
Adriana Maria Gulisano,Pascal Demoulin,Sergio Dasso,Luciano Rodriguez
Physics , 2012, DOI: 10.1051/0004-6361/201118748
Abstract: A large amount of magnetized plasma is frequently ejected from the Sun as coronal mass ejections (CMEs). Some of these ejections are detected in the solar wind as magnetic clouds (MCs) that have flux rope signatures. Magnetic clouds are structures that typically expand in the inner heliosphere. We derive the expansion properties of MCs in the outer heliosphere from one to five astronomical units to compare them with those in the inner heliosphere. We analyze MCs observed by the Ulysses spacecraft using insitu magnetic field and plasma measurements. The MC boundaries are defined in the MC frame after defining the MC axis with a minimum variance method applied only to the flux rope structure. As in the inner heliosphere, a large fraction of the velocity profile within MCs is close to a linear function of time. This is indicative of} a self-similar expansion and a MC size that locally follows a power-law of the solar distance with an exponent called zeta. We derive the value of zeta from the insitu velocity data. We analyze separately the non-perturbed MCs (cases showing a linear velocity profile almost for the full event), and perturbed MCs (cases showing a strongly distorted velocity profile). We find that non-perturbed MCs expand with a similar non-dimensional expansion rate (zeta=1.05+-0.34), i.e. slightly faster than at the solar distance and in the inner heliosphere (zeta=0.91+-0.23). The subset of perturbed MCs expands, as in the inner heliosphere, at a significantly lower rate and with a larger dispersion (zeta=0.28+-0.52) as expected from the temporal evolution found in numerical simulations. This local measure of the expansion also agrees with the distribution with distance of MC size,mean magnetic field, and plasma parameters. The MCs interacting with a strong field region, e.g. another MC, have the most variable expansion rate (ranging from compression to over-expansion).
Emerging roles of the SUMO pathway in mitosis
Mary Dasso
Cell Division , 2008, DOI: 10.1186/1747-1028-3-5
Abstract: SUMO proteins are small ubiquitin-like modifiers that become covalently conjugated to cellular proteins. In budding yeast, proteomic experiments indicate that 300 or more proteins may be SUMOylation targets [1-4]. This post-translational modification controls multiple events, including transcription, DNA repair, DNA recombination and mitotic chromosome segregation. The three former processes were covered within recent reviews [5-11], and will not be discussed here. Rather, I will focus on evidence that SUMOylation plays a critical role in mitotic chromosome structure and segregation, and on how this pathway may be regulated during mitosis.There is one SUMO protein in S. cerevisiae (Smt3p) and S. pombe (Pmt3), but mammalian cells typically express three SUMO paralogues (SUMO1-3) [12]. Like ubiquitin, newly translated SUMOs require cleavage to reveal C-terminal diglycine motifs (Figure 1, Step 1). After maturation, SUMO1 is ~45% identical to SUMO2 or 3, while SUMO2 and 3 are ~95% identical to each other. Where they cannot be distinguished, I will refer to SUMO2 and 3 collectively as SUMO2/3. Proteases of the Ubiquitin like protein protease/Sentrin specific proteases (Ulp/SENPs) family catalyze SUMO processing [13]. S. cerevisiae has two Ulp/SENPs (Ulp1p and Ulp2p/Smt4p). Ulp1p associates with the nuclear envelope [14], and is important for Smt3p maturation [15]. S. pombe likewise has two Ulp/SENPs (also called Ulp1 and Ulp2), while mammals have six (SENP1, 2, 3, 5, 6 and 7) [13].Conjugation of mature SUMOs occurs through a cascade (Figure 1, Steps 2–4) containing a heterodimeric activating enzyme (E1 enzyme. Uba2/Aos1), a conjugating enzyme (E2 enzyme. Ubc9) and usually a SUMO ligase (E3 enzyme) [12]. Nomenclature of SUMO pathway enzymes in yeast and vertebrates are given in Table 1. The result of these reactions is an isopeptide linkage between the SUMO C-terminal glycine and an ε-amino group of a lysine within the target protein. The biochemistry of SUMO and ubiquit
Global and local expansion of magnetic clouds in the inner heliosphere
Adriana Maria Gulisano,Pascal Demoulin,Sergio Dasso,Maria Emilia Ruiz,E. Marsh
Physics , 2012, DOI: 10.1051/0004-6361/200912375
Abstract: Observations of magnetic clouds (MCs) are consistent with the presence of flux ropes detected in the solar wind (SW) a few days after their expulsion from the Sun as coronal mass ejections (CMEs). Both the \textit{in situ} observations of plasma velocity profiles and the increase of their size with solar distance show that MCs are typically expanding structures. The aim of this work is to derive the expansion properties of MCs in the inner heliosphere from 0.3 to 1 AU.We analyze MCs observed by the two Helios spacecraft using \textit{in situ} magnetic field and velocity measurements. We split the sample in two subsets: those MCs with a velocity profile that is significantly perturbed from the expected linear profile and those that are not. From the slope of the \textit{in situ} measured bulk velocity along the Sun-Earth direction, we compute an expansion speed with respect to the cloud center for each of the analyzed MCs. We analyze how the expansion speed depends on the MC size, the translation velocity, and the heliocentric distance, finding that all MCs in the subset of non-perturbed MCs expand with almost the same non-dimensional expansion rate ($\zeta$). We find departures from this general rule for $\zeta$ only for perturbed MCs, and we interpret the departures as the consequence of a local and strong SW perturbation by SW fast streams, affecting the MC even inside its interior, in addition to the direct interaction region between the SW and the MC. We also compute the dependence of the mean total SW pressure on the solar distance and we confirm that the decrease of the total SW pressure with distance is the main origin of the observed MC expansion rate. We found that $\zeta$ was $0.91\pm 0.23$ for non-perturbed MCs while $\zeta$ was $0.48\pm 0.79$ for perturbed MCs, the larger spread in the last ones being due to the influence of the environment conditions on the expansion.
Molecular Evaluation of the Enterotoxigenicity of Clostridium difficile and Clostridium perfringens Swine Isolates by PCR Assays  [PDF]
Maria Cristina Ossiprandi, Laura Zerbini
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.32024

Clostridium difficile and C. perfringens are enteric pathogens affecting a variety of mammals. This study evaluated the molecular enterotoxigenicity of Clostridium swine isolates by PCRs. One hundred and ten swine faeces were analyzed by culture assay. The faecal samples were from sixty-seven healthy animals and 43 with gastrointestinal tract disease. C. difficile strains were PCR-screened for the presence of tcdA/tcdB and cdtA/cdtB genes. All C. perfringens isolates were tested for the characterization of the toxinotype. Overall, sixty-five swine resulted positive: 38 for C. difficile and 17 for C. perfringens. One sample tested C. perfringens and C. difficile-positive, at the same time: on the whole, 39 C. difficile strains were isolated. Thirty-eight C. difficile isolates (all from healthy animals) resulted tcdA/tcdB and cdtA/cdtB-negative by PCRs and toxins A/B-negative by immunological tests. All C. perfringens strains were type A; eight were also cpb2-positive. In the sample (diarrhoeic), with double infection, C. difficile tested tcdA/tcdB and cdtA/cdtB-positive by PCRs and toxins A/B-positive by immunoassays; C. perfringens resulted cpb2-positive. The molecular genotypeing/toxinotyping should be applied to establish a final diagnosis and to assess properly the full implications and the epidemiological impact of these findings in particular in samples of healthy animals and aid in the development of effective intervention methods for controlling clostridial disease outbreaks.

Research of antibodies anti-brucella ovis in ovine the eight city of rec ncavo baiano Detec o de anticorpos anti-"Brucella ovis" em ovinos do Estado da Bahia
Nairléia Santos Silva,Iracema Nunes Barros,Maurício Gautério Dasso,Maria das Gra?as ávila Ribeiro Almeida
Revista Brasileira de Saúde e Produ??o Animal , 2009,
Abstract: Ovine brucellosis is a contagious disease caused by Brucella ovis, characterized by clinical marked as epididymitis, abortion and lambs neonatal mortality, leading to reduction in reproductive efficiency of livestock and causing great economic damage. Considering the lack of seroepidemiologic data about B. Ovis in the State of Bahia and the importance of this disease in the economic sphere of sheep rearing, the design of this study aimed to achieve serum inquiry to investigate toe occurrence of anti-Brucella ovis in sheep in the Rec ncavo Baiano. 183 serum samples were submited to the test of agar gel immunodiffusion (AGIO) using soluble antigens produced by the Veterinary Research Center Oesidério Finamor (CPVOF) in Rio Grande do Sul. Six (3.27%) showed serological evidence of infection by B. Ovis Of 183 sera from sheep investigated by the AGIO to search for evidence of anti-Brucella ovis, with no significant difference between age and sex (p = 2.0 and p = 0.60, respectively) of animais with the proportion of sheep seropositives. The results obtained by serological survey have been lead to accept that the infection by B. Ovis it is present in commercial herds of sheep in the state of Bahia, and requiring more extensive studies in sheep population, adoption of sanitary measures of prevention and control to prevent the spread of the disease. A brucelose ovina é uma doen a de caráter contagioso, causada por Brucella ovis, caracterizada por um quadro clínico de epididimite, abortamento e mortalidade neonatal de cordeiros, levando a redu o da eficiência reprodutiva dos rebanhos e provocando grandes perdas econ micas. Considerando a ausência de dados epidemiológicos, sobre a B. ovis no estado da Bahia e sua importancia econ mica para ovinocultura, o presente trabalho teve por objetivo realizar inquérito sorológico para investigar a ocorrência de anticorpos anti-Brucella ovis em ovinos no rec ncavo baiano. Foram submetidas 183 amostras de soro ao teste de imunodifus o em gel de ágar (IDGA), utilizando antígenos solúveis produzidos pelo Instituto de Pesquisa Veterinária Desidério Finamor no Rio Grande do Sul. Dos 183 soros de ovinos investigados pela prova de IDGA para pesquisa de anticorpos anti-Brucella ovis, seis (3,27%) apresentaram evidência sorológica da infec o por B. ovis, n o havendo diferen a significativa entre a idade e sexo (P=2,0 e P=0,60, respectivamente) dos animais com a propor o dos reativos. Os resultados obtidos pelo inquérito sorológico realizado sugerem que a infec o por B. ovis faz-se presente nos rebanhos comerciais de ovinos do est
Manejo de Bovinos en Sistemas Productivos: Caracterización de dos estilos de manejo y niveles sanguíneos de cortisol - Productive Systems in Bovine Management. The Characterization in Two Styles and Blood Cortisol Levels
Costa, Alejandro,Dasso, Lucrecia
REDVET , 2007,
Abstract: ResumenLa problemática del Bienestar animal, ha adquirido relevancia internacional existiendo recomendaciones en el marco del comercio internacional. En la Argentina existe legislación, y las empresas frigoríficas, integrantes del Consorcio de Exportadores de Carnes Argentinas (ABC) han abordado la temática del Bienestar AnimalEl presente trabajo tiene como objetivo a caracterizar dos estilos de manejo contrastantes:un estilo de manejo mediante el cual los animales son dominados por la fuerza y otro estilo basado en el conocimiento del comportamiento del bovino, ambos con su correspondientecorrelato hormonal, a través de la medición del cortisol sanguíneo, como indicador del estrés. Un lote de 80 novillitos se dividió en forma aleatoria en dos sublotes de igual cantidad de animales. Cada sublote se sometió a uno de los dos estilos de manejo. De cada sublote se seleccionaron al azar, 10 animales. A cada animal se le extrajeron 2 muestras de sangre, con intervalo de 60 minutos entre cada extracción. A cada muestra se le dosó cortisol. La primer muestra informó sobre el nivel de cortisol bajo los dos tratamientos.La segunda se obtuvo luego de tranquilizar a los animales, dejándolos quietos en la manga, durante 60 minutos y tuvo como objeto despejar las modificaciones debidas a alarma simpática.Puede concluirse que existieron diferencias significativas en los niveles séricos de cortisol entre el sublote con tratamiento según pautas de bienestar y el sublote manejado según estilo convencional (P= 0,00413, p<0,01)El segundo muestreo, para ambos grupos, arrojó un incremento en los niveles de cortisol, y ese incremento fue significativo (P= 0,0017, p<0,001) Puede postularse que dicho incremento, ocurrido cuando se procedió a muestrear a ambos grupos de acuerdo a pautas debienestar, obedeció en parte al efecto de la venopunción, que afectó a los dos lotes. Pero además, el incremento fue mayor para el tratamiento convencional, a pesar, de que este incremento comparado con el registrado para el tratamiento con pautas de bienestar, no fuesignificativo (P= 0,2603), el valor hallado evidenciaría el modo en el cual los bovinos recuerdan el maltrato.En ambos tratamientos se registraron diferencias en el comportamiento. Con el tratamientosegún pautas de bienestar el manejo se efectuó sin que los animales presentaran signos de intranquilidad, en tanto que en el tratamiento convencional, signos como una marcada polipnea y fuerte excitación, se manifestaron con intensidad.The animal welfare problematic, has gained International relevance and in this frame exists recommendat
Wavelet Bases Made of Piecewise Polynomial Functions: Theory and Applications  [PDF]
Lorella Fatone, Maria Cristina Recchioni, Francesco Zirilli
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.22022
Abstract: We present wavelet bases made of piecewise (low degree) polynomial functions with an (arbitrary) assigned number of vanishing moments. We study some of the properties of these wavelet bases; in particular we consider their use in the approximation of functions and in numerical quadrature. We focus on two applications: integral kernel sparsification and digital image compression and reconstruction. In these application areas the use of these wavelet bases gives very satisfactory results.
Biodiversity Assessment of Sugar Beet Species and Its Wild Relatives: Linking Ecological Data with New Genetic Approaches  [PDF]
Filipa Monteiro, Maria M. Romeiras, Dora Batista, Maria Cristina Duarte
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.48A003

The value of crop wild relatives has long been acknowledged and this wild resource has been used to improve crop performance with clear economic benefits. Sugar beet (Beta vulgaris subsp. vulgaris) is the most economically valuable crop species in the order Caryophyllales, B. vulgaris subsp. maritima being the ancestor of the cultivated beets. The wild species of the genus Beta s.l. are commonly found in coastal areas of Europe and Mediterranean Region, where a rich genetic heritage still exists. Broadening the genetic base of sugar beet by introgression with wild relatives is a growing need regarding the maintenance of ecologically important traits. Since wild relatives have adapted to specific habitats, they constitute an important source of novel traits for the beet breeding pool. So, we conducted a broader research project aiming to delimit taxa and identify priority locations to establish genetic reserves of the wild Beta species occurring in Portugal (Western Iberian Peninsula). The aim of this study was: 1) to identify and characterize the main habitats of these wild Beta species; and 2) to present a review of some genetic tools available for future application in sugar beet breeding. In this review, we have focused on EcoTILLING as a molecular tool to assess DNA polymer

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