1,721,028 research outputs found
Effect of a physical barrier on adult emergence and egg survival associated with the fungus gnat, Bradysia sp. nr. coprophila (Diptera: Sciaridae), under laboratory conditions
Get PDFCitation: Raudenbush, Amy L., Raymond A. Cloyd, and Erik R. Echegaray. 2014. “Effect of a Physical Barrier on Adult Emergence and Egg Survival Associated with the Fungus Gnat, Bradysia Sp. Nr. Coprophila (Diptera: Sciaridae), under Laboratory Conditions.” HortScience 49 (7): 905–10. https://doi.org/10.21273/HORTSCI.49.7.905.This study was conducted to assess the direct and indirect effects of Growstones™ aggregates, which are made from recycled glass, on fungus gnat, Bradysia sp. nr. coprophila (Diptera: Sciaridae), adult emergence, female egg-laying capacity, and egg survival. A series of experiments were performed under laboratory conditions to evaluate the effect of different sizes (2.0 to 10.0 mm) of Growstones™ aggregates, layer thicknesses (0.63 to 3.18 cm), and the use of the biological control agent, the rove beetle, Dalotia coriaria, along with different thicknesses (1.27 and 3.18 cm) of small Growstones™ aggregates on fungus gnat adult emergence. For each experiment, Growstones™ aggregates were applied to the surface of the growing medium in 473-mL polypropylene deli containers. This study demonstrated that the thickest (3.18 cm) layer of small (2.0 mm) Growstones™ aggregates significantly reduced or delayed the emergence of fungus gnat adults. In addition, the thickest layer of small Growstones™ aggregates may have indirectly affected egg survival. However, the use of Growstones™ along with rove beetle adults did not significantly reduce fungus gnat adult emergence
Determination of silicon concentration in some horticultural plants
Get PDFCitation: Hogendorp, Brian K., Raymond A. Cloyd, and John M. Swiader. 2012. “Determination of Silicon Concentration in Some Horticultural Plants.” HortScience 47 (11): 1593–95. https://doi.org/10.21273/HORTSCI.47.11.1593.Although silicon is not an essential element, it is taken up by plants but is rarely quantified. Therefore, this study quantified the silicon concentration in 10 commonly grown horticultural plants including meadow sage (Salvia x sylvestris), tickseed (Coreopsis verticillata), garden phlox (Phlox paniculata), New England aster (Symphyotrichum novae-angliae), Chinese astilbe (Astilbe chinensis), coral flower (Heuchera hybrid), garden zinnia (Zinnia elegans), French marigold (Tagetes patula), sweet basil (Basil spp.), and rosemary (Rosmarinus officinalis) using a plant alkaline fusion technique, which involved dry-ashing plant tissue samples and measuring color development with a spectrophotometer. Both zinnia and aster accumulated substantially more silicon from the municipal water source and growing medium (5365 and 4797 mg·kgˉ¹ silicon, respectively) than the other plants evaluated, which had concentrations less than 2500 mg·kgˉ¹ silicon. This study is just one of a few in which the silicon concentration in various horticultural plants has been quantified. Consequently, this may lead to better understanding those plants that will or will not benefit from applications of silicon-based fertilizers to promote cold-hardiness and/or plant resistance to fungal pathogens and insect pests
Effects of Silicon -Based Fertilizer Applications on the Development and Reproduction of Insect Pests Associated With Greenhouse -Grown Crops
No full text210 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.Applications of silicon-based fertilizers to coleus, poinsettia, and fiddleleaf fig did not increase plant growth and development parameters such as moisture content (g), plant height (cm), and the number of mature leaves. The results of these studies clearly demonstrate that applications of silicon-based fertilizers to certain plant species including coleus, poinsettia, and fiddleleaf fig plants do not inhibit feeding of certain phloem-feeding insect pests such as citrus mealybug and greenhouse whitefly. Although, silicon may function as a protective or mechanical barrier associated with increased epidermal leaf thickness/toughness and strengthening cell walls in certain plant species, these effects are not universal. The proposed hypothesis that the presence of silicon in plant tissues inhibits insect feeding, and thus, development and reproduction, particularly phloem-feeders with piercing-sucking mouthparts such as citrus mealybug and greenhouse whitefly was not supported by the current study. The use of supplemental silicon-based fertilizers applied to greenhouse-grown crops do not provide host-plant resistance to certain insect pests.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Effects of Silicon -Based Fertilizer Applications on the Development and Reproduction of Insect Pests Associated With Greenhouse -Grown Crops
No full textApplications of silicon-based fertilizers to coleus, poinsettia, and fiddleleaf fig did not increase plant growth and development parameters such as moisture content (g), plant height (cm), and the number of mature leaves. The results of these studies clearly demonstrate that applications of silicon-based fertilizers to certain plant species including coleus, poinsettia, and fiddleleaf fig plants do not inhibit feeding of certain phloem-feeding insect pests such as citrus mealybug and greenhouse whitefly. Although, silicon may function as a protective or mechanical barrier associated with increased epidermal leaf thickness/toughness and strengthening cell walls in certain plant species, these effects are not universal. The proposed hypothesis that the presence of silicon in plant tissues inhibits insect feeding, and thus, development and reproduction, particularly phloem-feeders with piercing-sucking mouthparts such as citrus mealybug and greenhouse whitefly was not supported by the current study. The use of supplemental silicon-based fertilizers applied to greenhouse-grown crops do not provide host-plant resistance to certain insect pests.Made available in DSpace on 2015-09-25T21:00:40Z (GMT). No. of bitstreams: 2
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Previous issue date: 2008Embargo set by: Seth Robbins for item 84412
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only210 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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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