1,720,956 research outputs found
Effect of Nitrogen Supply and Genotypic Variation for Nitrogen Use Efficiency in Maize
No full textAims: Effect of nitrogen supply and genotypic variation for different traits related to nitrogen use efficiency (NUE) were studied in order to enhance the understanding of genetic basis of NUE and to find genetic materials for developing low-N tolerant maize genotypes. Methodologies: Ten genotypes (5 open pollinated varieties and 5 hybrids) were evaluated at four N levels (0; 30; 90; 180 kg N.ha-1) in split plot randomized block design with three replications at farmer field in Tulungagung, East Java, Indonesia, from November 2011 to February 2012. Results: The results showed that genotypes exhibiting contrasted responses to N nutrition. Nitrogen deprivation caused varied reductions of plant height, leaves area, chlorophyll content, stay green, N uptake, total dry matter, grain yield, grain number and a thousand grain weight among genotypes; but did increase days to 50% anthesis, 50% silking, anthesis-silking interval, crop recovery efficiency of applied N (REN), physiological efficiency of applied N (PEN), agronomic efficiency (AE) and NUE significantly (P = .05). Heritability estimates (h2) were high (h2 > 0.5) for most of measured traits at all N levels and ranged from -0.892 to 0.998. This indicated that it is possible to select genotypes are adapted to low N under both low and high N fertilization. High genotypic variation for grain yield was observed at all N levels, while for REN, PEN and AE were found at high-N and NUE at low-N. Reduction of N level from 180 to 90, 30 and 0 kg N.ha-1 caused reduction of 7.8%, 14.4% and 49.4% grain yields respectively. High grain yield were found in Bisi-2, Pioneer-21, NK-33, Bisma and DK-979 at high-N; and less yield reduction caused by N level reduction were found in DK-979, Madura, Bima-3, Bisma and NK-33, whilst high NUE traits were found in NK-33 and Pioneer-21. Conclusions: NK-33, Pioneer-21, DK-979 and Bisma are expected to be as genetic materials for developing tolerant low-N varieties
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
The Roles of Nitrogen and Potassium to Phosphoenolpyruvate Carboxylase Activity in the Leaves of Ratoon Crop M 442-51 and PS 60 Sugarcane Varieties
Get PDFStudy on the roles of nitrogen and potassium to phosphoenolpyruvate carboxylase (PEP-Case) activity in the leaves of ratoon crop of M 442-51 and PS 60 cane varieties were conducted in the Indonesian Sugar Research Institute (ISRI) Pasuruan, East Java. The experiment was arranged in a factorial trial using a completely ran-domized block design with three replicates. The factors used as a treatments in this experiment were: (1) sugar-cane variety, i.e. M 442-51 (V1) and PS 60 (V2), (2) plant category, i.e. plant crop (PC) and second ratoon crop (RC2), (3) dosage of nitrogen, i.e. 1 q AS/ha (N1) and 8 q AS/ha (N2), and (4) dosage of potassium, i.e. 1 q KCl/ha (K1) and 5 q KCl/ha (K2). PEP-Case activity variable was observed on 0, 1 and 4 weeks after treatment (wat). The results of experiment showed that nitrogen (N) and potassium (K) nutrients as single or mixture treatments were increasing the activity level of PEP-Case in the cane leaves significantly. There was indication that the effect of N is stronger than that the effect of K to PEP-Case activity in the leaves of cane. On the other hand, it was found that the activity of PEP-Case in M 442-51 was higher than that on PS 60. However, when the availability of both nutrients was limited, the decreasing activity of PEP-Case on PS 60 was sharper than that found on M 442-51. Study on plant category showed that the activity of PEP-Case on PC was higher than that found on RC2. Reducing of PEP-Case activity on RC2 was predicted as one factor that caused reducing of RC2 productivity. Base on these findings, it can be concluded that PEP-Case activity model in the leaves could be used as an early characteristic of cane ratooring ability. There were indications that the ability of both Mn and Cu nutrients affected the increasing of PEP-Case activity better than that influenced by N and K nutrients, but it needs further investigation.Â
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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