118,049 research outputs found
Data for: Environmentally mediated reproductive success predicts breeding dispersal decisions in an early successional amphibian
No full textThe data archived are occupancy data and capture-recapture data collected in a population of Bombina variegata over 9-years period.The file "multistate_data.txt" includes occupancy data. To investigate the influence of patch size and disturbance level on breeding occurrence, we used multistate occupancy models (Nichols et al. 2007, Gimenez et al. 2014). The data from the relevant two years of the breeding survey (2007 and 2008) was compiled in the same one dataset; one site therefore has two annual replicates with two detection occasions (July and August) each. The year was included in the model as a group effect. In the multistate model, we considered three states: a site could be unoccupied for breeding (U), occupied with non-effective reproduction (i.e. presence of eggs and larvae without metamorphosis success: L) or occupied with successful reproduction (i.e. presence of newly metamorphosed individuals: M). The observations (encoded in the txt file) were coded as undetected (0), eggs and/or larvae detected (1) and newly metamorphosed individuals detected (2).The file "data_2007-2008" includes capture-recapture data. The capture histoiries are encoded as following: for an individual captured at t and t–1, a code of 1 or 4 was attributed if it did not change patch and was in patch category s (small) or l (large) respectively, and a code of 2 or 5 was attributed if it did change patch and was in patch category s or l respectively. For an individual not captured at t–1 and captured at t in patch category s or l, a code of 3 or 6 was attributed respectively. An individual not captured at t was given a code of 0. The file "Croix_global_2000-2008_surface" includes capture-recapture data. The capture histoiries are encoded as following: for an individual captured at t and t–1, a code of 1 or 4 was attributed if it did not change patch and was in patch category l (low) or h (high) respectively, and a code of 2 or 5 was attributed if it did change patch and was in patch category l or h respectively. For an individual not captured at t–1 and captured at t in patch category l or h, a code of 3 or 6 was attributed respectively. An individual not captured at t was given a code of 0
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Transgenerational plasticity of dispersal-related traits in a ciliate: genotype-dependency and fitness consequences
No full textThe data presented here are those used in the paper : CAYUELA H., JACOB S., SCHTICKZELLE N., VERDONCK R., PHILIPPE H., LAPORTE M., HUET M., BERNATCHEZ L., LEGRAND D. Transgenerational plasticity of dispersal-related traits in a ciliate: genotype-dependency and fitness consequences. Oikos. DOI: 10.1111/oik.08846
Phenotypic plasticity, the ability of one genotype to produce different phenotypes in different environments, plays a central role in species' response to environmental changes. Transgenerational plasticity (TGP) allows the transmission of this environmentally-induced phenotypic variation across generations, and can influence adaptation. To date, the genetic control of TGP, its long-term stability, and its potential costs remain largely unknown, mostly because empirical demonstrations of TGP across many generations in several genetic backgrounds are scarce. In the paper of Cayuela et al., we examined how genotype determines the TGP of phenotypic traits related to dispersal, a fundamental process in ecology and evolution. We used an experimental approach in Tetrahymena thermophila, a ciliate model-species, to determine if and how phenotypic changes expressed following a dispersal treatment are inherited over multiple generations. The data include morphological and movement traits, dispersal rates, and cell growth data measured before and after dispersal trials. We considered different genotypes and different populations within each genotype.The txt files are attached. The files "IGP" are those used in the analyses on intra-generational plasticity of fitness and phenotypic traits before ("pre-trial") and after ("post-trial") the dispersal.
The files "Reversibility" correspond to reversibility analyses (fitness and phenotypic traits) for cells with dispersing and non-dispersing ancestors.
The files "TGP" are those used for transgenerational plasticity analyses (fitness and phenotypic traits)
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Rapid NIR determination of alkyl esters in virgin olive oil
No full textThe regulation of The European Union for olive oil and olive pomace established the limit of 35 mg·kg-1 for fatty acids ethyl ester contents in extra virgin olive oils, from grinding seasons after 2016. In this work, predictive models have been established for measuring fatty acid ethyl and methyl esters and to measure the total fatty acid alkyl esters based on near infrared spectroscopy (NIRS), and used successfully for this purpose. The correlation coefficients from the external validation exercises carried out with these predictive models ranged from 0.84 to 0.91. Different classification tests using the same models for the thresholds 35 mg·kg-1 for fatty acid ethyl esters and 75 mg·kg-1 for fatty acid alkyl esters provided success percentages from 75.0% to 95.2%.</jats:p
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Estudio de la expresión de enzimas del metabolismo de aminoácidos en Lactococcus lactis
No full textMemoria que para optar al grado de Doctor
presenta el Licenciado Tomás García Cayuela y que ha sido realizado en el Instituto del Frío (CSIC) y en Instituto de Investigación en Ciencias de la
Alimentación (CSIC-UAM).Los aminoácidos son fundamentales para la supervivencia y el desarrollo de bacterias. Son las principales fuentes de nitrógeno y están implicados en la producción de energía, el control del pH intracelular y la regeneración de cofactores. Además, son los precursores de una larga variedad de compuestos volátiles en Lactococcus lactis y, por ello, diversas enzimas son consideradas clave para su formación, como aminotransferasas, deshidrogenasas, liasas y decarboxilasas, entre otras. Estas enzimas están reguladas por diferentes mecanismos en respuesta a la disponibilidad de sustratos, así como por sistemas de regulación globales que actúan a nivel transcripcional. En este sentido, los aminoácidos de cadena ramificada (BCAAs) parecen tener un papel regulatorio clave en L. lactis, ya que son esenciales para la síntesis de proteínas, además de actuar de precursores de compuestos representativos del aroma del queso. La presencia de ciertas enzimas no garantiza un determinado impacto en el aroma, por lo que se considera necesario estudiar el nivel de actuación de esas enzimas, abordando estudios sobre su expresión que integren observaciones fenotípicas con análisis genómicos y transcriptómicos.
El objetivo de este trabajo ha sido evaluar la influencia de diversos mecanismos
de regulación en la expresión de determinadas enzimas del metabolismo de
aminoácidos y su relación en el control de la formación de compuestos volátiles en L.
lactis.Consejo Superior de Investigaciones Científicas (CSIC), por la concesión de una Beca I3P.Peer Reviewe
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
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