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Search Results: 1 - 10 of 4331 matches for " Veronica Arias "
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A thousand shadows of Andromeda: rotating planes of satellites in the Millennium-II cosmological simulation
Rodrigo A. Ibata,Neil G. Ibata,Geraint F. Lewis,Nicolas F. Martin,Anthony Conn,Pascal Elahi,Veronica Arias,Nuwanthika Fernando
Physics , 2014, DOI: 10.1088/2041-8205/784/1/L6
Abstract: In a recent contribution, Bahl \& Baumgardt investigated the incidence of planar alignments of satellite galaxies in the Millennium-II simulation, and concluded that vast thin planes of dwarf galaxies, similar to that observed in the Andromeda galaxy (M31), occur frequently by chance in $\Lambda$-Cold Dark Matter cosmology. However, their analysis did not capture the essential fact that the observed alignment is simultaneously radially extended, yet thin, and kinematically unusual. With the caveat that the Millennium-II simulation may not have sufficient mass resolution to identify confidently simulacra of low-luminosity dwarf galaxies, we re-examine that simulation for planar structures, using the same method as employed by Ibata et al. (2013) on the real M31 satellites. We find that 0.04\% of host galaxies display satellite alignments that are at least as extreme as the observations, when we consider their extent, thickness and number of members rotating in the same sense. We further investigate the angular momentum properties of the co-planar satellites, and find that the median of the specific angular momentum derived from the line of sight velocities in the real M31 structure ($1.3\times10^4$ km/s kpc) is very high compared to systems drawn from the simulations. This analysis confirms that it is highly unlikely that the observed structure around the Andromeda galaxy is due to a chance occurrence. Interestingly, the few extreme systems that are similar to M31 arise from the accretion of a massive sub-halo with its own spatially-concentrated entourage of orphan satellites.
Extremely Early Diagnostic Test for Prostate Cancer  [PDF]
Veronica Jean James
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.23051
Abstract: Purpose: This article reports the results of a blinded fibre diffraction study of skin samples taken from TRAMP mice and age-matched controls to determine whether changes noted in fibre diffraction studies of human skin were present in these TRAMP mice studies. These mice are bred to progress to Gleeson Type 3 to Type 5 prostate cancer. Methods: Small strips, 1 mm × 5 mm, cut from the mouse skin samples were loaded into cells in the same way as human samples and slightly stretched to remove the crimp. They remained fully hydrated throughout exposure to the synchrotron beam. Results: The added change that was reported for prostate cancer in 2009 was obtained for all TRAMP mice samples, indicating that this change can be read as High Grade Cancer in human diagnostic tests. Discussion: These changes were evident for all 3 and 7 week old TRAMP mice samples but not for any of the control samples. This indicates that the changes in the fibre diffraction patterns appear much earlier than in any other available prostate cancer diagnostic test, as none of these can verify the presence of prostate cancer in the TRAMP mice before 10 weeks of age. The fibre diffraction test is therefore the most accurate and earliest test for high grade prostate cancer.
The Molecular Architecture for the Intermediate Filaments of Hard α-Keratin Based on the Superlattice Data Obtained from a Study of Mammals Using Synchrotron Fibre Diffraction
Veronica James
Biochemistry Research International , 2011, DOI: 10.1155/2011/198325
Abstract: High- and low-angle X-ray diffraction studies of hard α-keratin have been studied, and various models have been proposed over the last 70 years. Most of these studies have been confined to one or two forms of alpha keratin. This high- and low-angle synchrotron fibre diffraction study extends the study to cover all available data for all known forms of hard α-keratin including hairs, fingernails, hooves, horn, and quills from mammals, marsupials, and a monotreme, and it confirms that the model proposed is universally acceptable for all mammals. A complete Bragg analysis of the meridional diffraction patterns, including multiple-time exposures to verify any weak reflections, verified the existence of a superlattice consisting of two infinite lattices and three finite lattices. An analysis of the equatorial patterns establishes the radii of the oligomeric levels of dimers, tetramers, and intermediate filaments (IFs) together with the centre to centre distance for the IFs, thus confirming the proposed helices within helices molecular architecture for hard α-keratin. The results verify that the structure proposed by Feughelman and James meets the criteria for a valid α-keratin structure.
Closing the Global Energy and Nutrient Cycles through Application of Biogas Residue to Agricultural Land – Potential Benefits and Drawback
Veronica Arthurson
Energies , 2009, DOI: 10.3390/en20200226
Abstract: Anaerobic digestion is an optimal way to treat organic waste matter, resulting in biogas and residue. Utilization of the residue as a crop fertilizer should enhance crop yield and soil fertility, promoting closure of the global energy and nutrient cycles. Consequently, the requirement for production of inorganic fertilizers will decrease, in turn saving significant amounts of energy, reducing greenhouse gas emissions to the atmosphere, and indirectly leading to global economic benefits. However, application of this residue to agricultural land requires careful monitoring to detect amendments in soil quality at the early stages.
A Pilot Study of a Pictorial Bilingual Nutrition Education Game to Improve the Consumption of Healthful Foods in a Head Start Population
Veronica Piziak
International Journal of Environmental Research and Public Health , 2012, DOI: 10.3390/ijerph9041319
Abstract: The prevalence of early childhood obesity has increased dramatically particularly among the Mexican American population. Obesity leads to earlier onset of related diseases such as type 2 diabetes. The Head Start population of Texas is largely Mexican American. Dietary intake in this population demonstrated a diet very low in fiber, high in salt, and containing excessive calories with a low intake of fruit and vegetables. This study was performed in a Texas Head Start population to evaluate a bilingual pictorial nutrition education game. Acceptance of the bilingual concept and the game had been previously studied in a Head Start population in five Texas counties. The effectiveness in producing a change in eating habits was studied as a pilot project 413 children and their parents at the Bastrop County Head Start. Parents were asked to supply data about at home food frequency at the beginning and the end of the school year and the results compared. The parents were given a demonstration of the educational objectives and the students played the game throughout the year. By the end of the school year there was a statistically significant increase in the vegetables offered to this population both during the week at home ( p = 0.009) and on the weekends ( p = 0.02).
Caretaker Brca1: keeping the genome in the straight and narrow
Veronica Yu
Breast Cancer Research , 2000, DOI: 10.1186/bcr37
Abstract: Ever since the cloning of the two breast cancer susceptibility genes BRCA1 and BRCA2, intense scientific effort has been invested into elucidating their biologic functions. Both genes encode large proteins (1863 and 3418 amino acids, respectively) that are coordinately expressed during cellular proliferation and differentiation [1]. The BRCA1 and BRCA2 proteins are expressed in most tissues and most abundantly during the S phase of the cell cycle. A plethora of functions have been ascribed to BRCA1 and BRCA2, including transcription activation [2,3,4], chromatin remodelling [5,6], centrosome duplication [7,8], apoptosis [9], and transcription-coupled [10] and homology directed [11,12,13] DNA repair.Murine models for BRCA1 and BRCA2 mutations establish that both genes are essential for development [14,15,16,17], because early embryonic lethality is a common phenotype. This early lethal phenotype can be partly rescued by introducing a null mutation in the damage checkpoint gene p53 or p21 [18]. This suggests that loss of BRCA1 or BRCA2 may trigger the activation of a cell-cycle checkpoint through the accumulation of DNA damage. In agreement with this, both Brca1-/- and Brca2 -/- homozygous cells have been found to be hypersensitive to γ-irradiation [17,18] and spontaneously exhibit chromosomal abnormalities [11,13].The first indication that BRCA1 and BRCA2 function in homologous recombination came from coimmunoprecipitation and yeast two-hybrid studies [17,19,20], which demonstrated that both BRCA1 and BRCA2 interacted with Rad51, a mammalian homologue of the Escherichia coli RecA protein that is involved in DNA damage repair. (The association of BRCA1 with Rad51, however, is likely to be indirect and possibly mediated by BRCA2 [21]). Immunostaining further suggests that BRCA1, BRCA2 and Rad51 work together in a protein complex as they coalesce to form discrete nuclear dots during S phase and after DNA damage [21,22]. Moreover, in meiotic cells extensive colocalizatio
Desafios para a implanta??o da Educa??o Integral: análise das experiências desenvolvidas na regi?o sul do Brasil
Branco, Veronica;
Educar em Revista , 2012, DOI: 10.1590/S0104-40602012000300008
Abstract: this text is about the perception of municipal administration, pedagogical coordinators and parents of students about the challenges to introduce the whole education or the increasing of time of scholar journey in experiences developed in cities of the south region of brazil: apucarana, joinville and porto alegre. these experiences are part of a research made by the federal universities: ufmg, unirio, ufpr and unb, with the purpose of mapping experiences of increased scholar journeys in process in brazil, in the year of 2008 - quantitative study. in 2009 and 2010 there was the continuation of that research, then as a qualitative study. in the part of the qualitative study there were chosen twenty-one experiences from the whole country to be followed and documented in their place. in the south region three experiences were selected, one from each state of the region. in this phase the data was collected in interviews with the related people, whose analyses compose this text and point as main challenges/difficulties to establish the increasing time of scholar journey in the initial and continuous forming of teachers and the integration of monitors and new actors in the group of scholar tasks. beyond these, it appears, strongly marked in the ideas of the interviewed people, the conception that the whole education is a right of the families, and not of the students, and also a kind of school dedicated to the students whose families are poor and can't take care of their children.
A sala de aula na educa??o de jovens e adultos
Branco, Veronica;
Educar em Revista , 2007, DOI: 10.1590/S0104-40602007000100011
Abstract: this article presents its author's established relations between the results of research in literacy among teachers of children and teenagers and also adults and her observations developed in schools of curitiba's community with trainees from the discipline of teaching practice for elementary school in pedagogy course of ufpr. this article presents reports from eja (adult and teenagers education) students as a demonstrative of classroom reality, as well as theoretical analyses references from linguistics, psycholinguistics and pedagogy about literacy. this article also suggests a literacy teachers improvement.
Hayden White y una filosofía de la historia literariamente informada
TOZZI,VERONICA;
Ideas y Valores , 2009,
Abstract: the year 2008 is the 25th of the publication of metahistory: the historical imagination in nineteenth-century europe, a milestone for the philosophy of history, since it comprehends its linguistic turn. 2008 is also the 80th birthday of hayden white, an occasion for philosophers of history and historians from several areas to revisit his work and reconsider the challenges that it has delegated to us. a fundamental challenge is the necessity of going back, again and again, to literary theory to elucidate the nature of historical discourse. this article makes a critical evaluation on the consequences that literary information has for the cognitive status of historical representation.
Caries prevalence in skeletal series: is it possible to compare?
Wesolowski, Veronica;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006001000021
Abstract: because of the relationship with subsistence, dental caries is a central issue in paleopathological research. usually, comparisons between caries prevalence exhibited in different skeletal series are made. dietary variation is the most common explanation for cavities prevalence. the aim of this paper is to verify if it is possible to compare caries prevalence reported on papers for archaeological skeletal series. another goal is to determine if other factors besides diet are implicated in dental cavity prevalence explanation. twenty six papers about dental health with caries prevalences published from 1999 to 2004 were analyzed for completeness. this assessment includes carious lesion diagnosis and characteristics, age, sex and size characteristics of samples, and prevalence calculation method. the majority of the analyzed papers do not provide adequate information in the topics listed above. only very few implicated factors other than diet as a contributor to caries lesions development.
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