186,566 research outputs found
Bactericera cockerelli (Sulc), tomato/potato psyllid (Hemiptera: Triozidae)
No full textBook Description "Biological control programmes in Canada 2001-2012": This volume (71 chapters), the fifth in a series documenting biological control programmes in Canada, presents new information on specific insect, weed or plant diseases, some of which are updates of on-going studies on historical biological control projects while other chapters report on biological control efforts for new emerging invasive alien species. In each case, information is presented in a consistent and logical manner, starting with the pest status in Canada, followed by a comprehensive background on previous studies, review of the use of biological control in these programmes, and an evaluation of the biological control efforts and future needs in research or implementation activities. A total of 64 chapters is dedicated to biological control case studies over the past 11 years - 36 on insect pests of agricultural importance and forestry or ornamental pests; 18 on the control of weeds for crops, rangeland, pastures or aquatic areas; and 10 on the biological control of plant disease causal agents. This book is intended for researchers and students in biological control, pest management, ecology and risk assessment.
Chapter 14 "Bactericera cockerelli (Sulc), tomato/potato psyllid (Hemiptera: Triozidae)": This chapter describes the pest status and biological control (parasitoids, predators and pathogens) of B. cockerelli [Trioza cockerelli] (tomato/potato psyllid) in Canada.book chapterPublished
OxDNA.org: A public webserver for coarse-grained simulations of DNA and RNA nanostructures
No full textOxDNA and oxRNA are popular coarse-grained models used by the DNA/RNA nanotechnology community to prototype, analyze and rationalize designed DNA and RNA nanostructures. Here, we present oxDNA.org, a graphical web interface for running, visualizing and analyzing oxDNA and oxRNA molecular dynamics simulations on a GPU-enabled high performance computing server. OxDNA.org automatically generates simulation files, including a multi-step relaxation protocol for structures exported in non-physical states from DNA/RNA design tools. Once the simulation is complete, oxDNA.org provides an interactive visualization and analysis interface using the browser-based visualizer oxView to facilitate the understanding of simulation results for a user's specific structure. This online tool significantly lowers the entry barrier of integrating simulations in the nanostructure design pipeline for users who are not experts in the technical aspects of molecular simulation. The webserver is freely available at oxdna.org
Designing patchy interactions to self-assemble arbitrary structures
No full textOne of the fundamental goals of nanotechnology is to exploit selective and directional interactions between molecules to design particles that self-assemble into desired structures, from capsids, to nanoclusters, to fully formed crystals with target properties (e.g., optical, mechanical, etc.). Here, we provide a general framework which transforms the inverse problem of self-assembly of colloidal crystals into a Boolean satisfiability problem for which solutions can be found numerically. Given a reference structure and the desired number of components, our approach produces designs for which the target structure is an energy minimum, and also allows us to exclude solutions that correspond to competing structures. We demonstrate the effectiveness of our approach by designing model particles that spontaneously nucleate milestone structures such as the cubic diamond, the pyrochlore, and the clathrate lattices
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Morfometría y tabla de vida de Bactericera cockerelli (Sulc) en dos variedades de jitomate en invernadero.
No full textSe evaluó el efecto de dos variedades de jitomate (“Charanda F1” y “Rafaello”) en la morfometría de B. cockerelli (Sulc). Se colectaron huevos, ninfas y adultos criados en dos variedades de jitomate “Charanda F1” y “Rafaello”, en condiciones de invernadero en el Colegio de Postgraduados, Campus Montecillo, Texcoco, México, en el periodo Octubre-Diciembre 2009 – Enero-Marzo 2010. Las condiciones generales de la cría fueron: sin aplicación de agroquímicos; los adultos fueron mantenidos en jaulas individuales de marco de madera cubiertos con tela de organza, bajo un periodo de 14 h de luz, con un rango de temperatura de 10 a 25° C. En el análisis de morfometría de huevos se consideraron las variables: Longitud de Huevo (LH), Ancho de Huevo (AH) y Longitud de Pedicelo (PED). En ninfas, Largo de Cuerpo (LC), Ancho de Cuerpo (AC) y Longitud de Antenas (ANT). En adultos, Longitud de Cuerpo (LC), Ancho de Cuerpo en Tórax (ACT), Longitud de Ala (LALA), Ancho de Ala (ANALA). Se encontró que el efecto de las variedades de jitomate en la morfometría, no presenta diferencias significativas sobre la Longitud de huevos (F1, 41=0.57; p=0.4551); aunque el Ancho de huevo sí resultó afectado por la variedad de jitomate sobre la que se criaron los insectos (F1, 41=11.92; p=0.0013). Los estados ninfales, para las variables Largo de Cuerpo (F4, 324=1199.2; p<0.0001), Ancho de Cuerpo (F4, 324=900.72; p<0.0001) y Largo de Antenas (F4, 324=883.93; p<0.0001), resultaron diferenciadas en forma significativa debido a la variación de los diferentes ínstares; esta diferencia tiene implicaciones prácticas porque dichas variables podrían ser usadas como guías para diferenciar las cinco fases ninfales. La longitud del cuerpo del adulto (F1, 117=7.11; p=0.0087), se afecta cuando se cría, sobre las variedades de jitomate mencionadas. _______________ MORPHOMETRICS OF EGGS, NYMPHS, AND ADULTS OF Bactericera cockerelli (Sulc), GROWN IN TWO VARIETIES OF TOMATO UNDER GREENHOUSE CONDITIONS. ABSTRACT: The effect of two varieties of tomato (“Charanda F1” and “Rafaello”) was evaluated on the morphometrics of B. cockerelli (Sulc). Eggs, nymphs, and adults of B. cockerelli (Sulc) were collected from two varieties of tomato, “Charanda F1” and “Rafaello”, under greenhouse conditions in the Colegio de Postgraduados, Campus Montecillo, Texcoco, the State of Mexico, during the periods October-December, 2009 and January-March, 2010. The general growth conditions of the offspring were: no application of agrochemicals, adults were kept in individual cages, wood frames covered with organza cloth, under a 14 h light period, temperature range from 10 to 25 °C. For the morphometrics analysis of the eggs, the following variables were considered: egg length (LH), egg width (AH), and pedicel length (PED). For nymphs, the variables were: body length (LC), body width (AC), and antennae length (ANT). For adults, the variables were: body length (LC), body width at thorax (ACT), wing length (LALA), and wing width (ANALA). The tomato varieties were found to have the following effects on morphometrics of B. cockerelli (Sulc): no significant difference in egg length (F1,41=0.57; p=0.4551); egg width was affected by the variety of tomato (F1,41=11.92; p=0.0013). There were significant differences in nymphs depending on the instances: body length (F4,324=1199.2; p<0.0001), body width (F4,324=900.72; p=0.0001); and antennae length (F4,324=883.93; p=0.0001). These differences have practical implications, since said variables can be used as guides to differentiate the five nymph stages. Body length of the adults (F1,117=7.11; p=0.0087) is affected by the different tomato varieties mentioned.Tesis (Maestría en Ciencias, especialista en Entomología y Acarología).- Colegio de Postgraduados, 2010.Consejo Nacional de Ciencia y Tecnología (CONACyT)
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
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
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
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
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