117,444 research outputs found
The automatic behavior of smokers as a function of the time passed from the last sigarette smoked
No full textThirty-two smokers participated in the present study. They were administered an implicit task (i.e., IAAT, Implicit Approach-Avoidance Task; Castelli & Paladino, 2002) in order to measure their spontaneous behavioral tendency to approach smoke-related stimuli. It is hypothesized that the internal motivational state of either deprivation or satiation may influence spontaneous behavioral responses. Results confirmed the hypothesis demonstrating that participants who spent more time without smoking were faster when approaching smoke-related stimuli in comparison to those who had smoked recently. These results suggest the importance of investigating the impact that motivational states may exert on the automatic processes that regulate smokers' perception of smoking
[Recurrent torsion of ectopic accessory spleen in a patient with agenesis of the gallbladder].
No full text
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
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
Yam beans (Pachyrhizus tuberosus (Lam.) Spreng. and Pachyrhizus erosus (L.) Urb.—Fabaceae)—lowland South American and Meso-American cultivars and landraces with starch and protein market potential—their botany, agronomy, ethnobotany, and present uses
No full text3 figuras.- 8 tablas.- 149 referenciasThe two cultivated lowland species belonging to the genus Pachyrhizus Rich. ex DC.—the yam beans—P. erosus (L.) Urb. and P. tuberosus (Lam.) Spreng. exclusively seed propagated and cultivated for their edible starch and protein-rich tuberous roots, their evolution and domestication processes including cultivar groups and landraces are described. Agroecological requirements, agronomy including large-scale commercial and the small-scale traditional cultivation practices, are detailed. Postharvest processing and industrial potential are based on starch (10%–35%), protein (4%–10%), and fiber (3.6%–4.1%) contents, depending on species and cultivar group. Both starch and protein qualities are high. The starch granules are comparable to rice (Oryza sativa L.) starch (85%–91% amylopectin) and the protein to that of native potato (Solanum spp.). Besides, agronomic management is easy when compared to P. ahipa. Meanwhile, P. tuberosus is grown and still consumed mainly at rural households. Root dry matter content of P. tuberosus ranges from 21% to 34% compared to P. ahipa (16%–20%). Through interspecific crossings (e.g., P. ahipa × P. tuberosus Chuin cultivar group), the progenies can produce starch content up to 25%. The Pachyrhizus spp. starch possesses a high quality due to low amylose content (less than 16%) when compared to traditional starch from monocots. In commercial pilot production of P. tuberosus sundried meal, the estimated composition can increase up to 61% starch, 24% protein, and 15% fiber. © 2023 Elsevier Inc. All rights reserved.Peer reviewe
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
Uptake of micro and macronutrients in relation to increasing Mn concentrations in Cistus salvifolius L. grown in hydroponic cultures
No full textMining and smelting activities can alter the ecosystem degrading vegetation
and landscape, causing loss of soil fertility and changes in hydrology
and microclimate. The mining area of Rio Tinto is one of the largest metallic
sulfide deposits in the world, extending to southern Portugal and the
Rio Tinto region (Huelva, SW Spain). Soils, characterized by low pH, are
strongly impoverished in macro- and micronutrients essential to the plant
metabolism and contain very high concentrations of As, Cu, Fe, Mn, and
Pb. The aim of this study was to evaluate the effects of increasing Mn
concentrations (0, 50, 100, 200, and 300 mg /L) on the uptake of a set of
micro and macro nutrients in Cistus salvifolius L., a species native of the
Rio Tinto region. The plants, grown in hydroponic culture, were analyzed
by AAS for elemental content and by SEM-XS ray microanalysis for element
localization. The results of this study showed a stunted growth and
ultrastructural alterations in the root of C. salvifolius, with the most evident
damages occurring at the highest Mn concentration. Chemical analyses
confirm that the higher the concentration in culture medium, the higher the
uptake of Mn in plant tissue; both lower and higher Mn concentrations influence
the absorption of other essential nutrients, as Fe, Zn, K, and Mg.
The visible state of stress observed in plants grown with addition of 300
ppm Mn may therefore be due to such variations in the absorption of micronutrients
and/or to theMn itself. Future studies should focus on possible
synergistic and antagonistic activities ofMn versus other essential elements
for proper plant development
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
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