1,722,421 research outputs found
[Protests] Photograph of Gloria Ramirez, Josefina Ramirez, Maria Rosa Ramirez attending protest meeting at California stadium
No full textProtest meeting at a stadium with United Farm Workers flag; Gloria Ramirez, Josefina Ramirez, Maria Rosa Ramirez; taken in California. 1960shttps://scholarworks.utrgv.edu/bhh2014/1195/thumbnail.jp
FIGURE 3 in Mazzaella canaliculata comb. nov. based on Chondrus canaliculatus (Gigartinaceae, Rhodophyta) from Peru and Chile
No full textFIGURE 3. ML phylogenetic tree of COI sequences, showing the position of Mazzaella canaliculata comb. nov. from different localities of central Peru, along with other species of Mazzaella and genera of the family Gigartinaceae. The ML bootstrap support and Bayesian posterior priorities ≥ 50/0.5 are reported above and below the branches. The dash '-' indicates lower support values. Generatypes species are identified by an asterisk (*).Published as part of Arakaki, Natalia & Ramirez, Maria Eliana, 2021, Mazzaella canaliculata comb. nov. based on Chondrus canaliculatus (Gigartinaceae, Rhodophyta) from Peru and Chile, pp. 211-228 in Phytotaxa 497 (3) on page 220, DOI: 10.11646/phytotaxa.497.3.2, http://zenodo.org/record/542394
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Taguchi method for the optimization of three loop mediated isothermal amplification procedures for Tritrichomonas foetus detection
Full text linkFil: Ramirez, Maria Rosana. Instituto Universitario de Ciencias de la Salud. Fundación Barceló; Argentina.Taguchi method was used to optimize loop mediated isothermal amplification tests aimed to amplify segments of the elongation factor 1a1 (tf-ef1a1), the 5,8 ribosomal gene (tf-5,8 r) or the beta tubulin 2 (tf-btub2) from the protozoan parasite Tritrichomonas foetus. L9 orthogonal array and quadratic loss functions that penalize deviations from prediction values revealed the effect of amplification reaction components. Analysis of variance (ANOVA) decomposed the contribution of individual factors to a small Ct. Confirmation experiments established that optimum conditions were predictable, verifiable and reproducible. Primers concentration conditioned the non-specific amplification of tf-ef1a1 while betaine and magnesium concentration contributed to accelerate the time to reach a positive threshold in tf-ef1a1, tf-5,8 r and tf-btub2. The general strategy of simple and robust experimental design holds potential as a general optimization protocol for LAMP tests in every diagnostic laboratory
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Crucial Role of the Accessory Genome in the Evolutionary Trajectory of Acinetobacter baumannii Global Clone 1
Full text linkDespite not being a disease in and of itself, antibiotic resistance could be consideredthe global epidemic of modern times, since it produces the failure to prevent andtreat many infectious diseases. This can ultimately lead to untreatable microbialinfections becoming more widespread and this will significantly increase morbidityand mortality. This worldwide problem is estimated to cause millions of deathsper year and could become an even more significant menace to humanity thanestablished illnesses, such as cancer.In February 2017, the World Health Organization (WHO) published a list ofantibiotic-resistant priority pathogens a catalogue of 12 families of bacteria whichpose the greatest threat to human health - and Acinetobacter baumannii is leadingthe list. The most critical group includes multidrug-resistant bacteria, which pose aparticular threat in hospitals, nursing homes, and among patients whose care requiresdevices such as ventilators and blood catheters. This group includes Acinetobacter,Pseudomonas, and various Enterobacteriaceae and they are often associated withdeadly infections, such as bloodstream infections and pneumonia. Furthermore,these bacteria have become resistant to a large number of antibiotics, includingcarbapenems and third generation cephalosporins ? the best available antibioticsfor treating multidrug-resistant bacteria.A. baumannii is a particularly worrisome example and demands attention: Thispathogen turned into a menace to humans during the late 70s, likely as a result ofintense antibiotic use in hospital settings, and became one of the microorganismsthat are challenging the antibiotic era. Its extreme genome plasticity, combined withmechanisms of horizontal genetic transfer, have played a key role in the evolutionof this microorganism, as well as its adaptability to unfavorable environments.However, its pathophysiology, as well as the mechanisms leading to its success asa pathogen, are not that simple to unveil. However, what is clear is that the triad ofhost-pathogen-environment is crucial in selection and establishment ofmultidrug-resistant clones and outbreaks.Indeed, there are still many aspects of this pathogen that require a deeperunderstanding - not only regarding mechanisms of resistance but also itsglobal pathophysiology. For example, basic understanding of transmissionmechanisms; knowledge of external factors modulating persistence of thepathogen; genetic effects on host susceptibility and infectiousness; mechanisms ofpathogenicity and their dynamics; and genetic variation of the pathogen affectingvirulence and transmissibility are some aspects that would require further study.Frontiers in Microbiology 3 August 2020 | Unraveling the Biology, GeneticsFurthermore, the importance of other members of the genus as important nosocomialpathogens, such as Acinetobacter nosocomialis, has been increasingly recognizedduring the last few years.Fil: Alvarez, Verónica Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Quiroga, María Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Galán, Angélica Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Vilacoba, Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Quiroga, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; ArgentinaFil: Ramirez, Maria Soledad. California State University; Estados UnidosFil: Centron, Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; Argentin
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
