1,720,973 research outputs found
Growth and nutrient uptake of late artichoke cv. Terom
No full textThe aim of this research was to determine the growth rate and the nutrient uptake (N, P,
K, Ca, Mg) of artichoke during the first three planting years, using the late cultivar “Terom”. Artichoke
plants showed two periods of vegetative growth, in autumn and spring. In the third year, the fresh biomass
production was 106.3 t ha−1 (equal to 13.6 t ha−1 of dry weight). Total nutrient uptake of artichoke
plants was 272 kg ha−1 of N, 40.2 kg ha−1 of P2O5, 342.4 kg ha−1 of K2O, 314 kg ha−1 of CaO and 8.8 kg ha−1
of MgO, while the nutrient uptake ratio was 1: 0.14 : 1.25 : 1.15 : 0.03. Nutrients removal by artichoke
head harvest was 32.1 kg ha−1 of N, 6.7 kg ha−1 of P2O5, 39.7 kg ha−1 of K2O, 20.6 kg ha−1 of CaO and 0.36
kg ha−1 of MgO. The highest nutrient uptake occurred in spring, during the growth of the flower stems
until the harvest of the main heads
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Influence of medium composition und vessel ventilation during the micropropagation stages of Cynara scolymus L. cv. Grato
No full textAppropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Variazioni fisiologiche e biochimiche in foglie di Passiflora incarnata durante il processo di ontogenesi
No full textGrowth and Accumulation of Caffeic Acid Derivatives in Echinacea angustifolia DC. var. angustifolia grown in Hydroponic Culture
No full textIn separate experiments conducted in 2007 and 2008, growth and accumulation of selected caffeic acid
derivatives (CADs; i.e., caftaric acid, chlorogenic acid, echinacoside, caffeic acid, cynarin, p-coumaric acid,
ferulic acid and cichoric acid) were determined in Echinacea angustifolia DC. var. angustifolia seedlings
grown in hydroponic culture (floating raft system) at a density of 122 plant m−2 (at planting). Plants
were harvested 11 (2007) or 16 (2008) weeks after transplanting (i.e., 15 or 20 weeks after sowing). In
both years, plants grew vigorously and at harvest approximately half of the plants under observation had
developed one to three inflorescences. In 2008, the root yield (2940 kg ha−1) harvested in nearly eight
months from two consecutive hydroponic cultures was within the yield reported in the literature for
field cultivations lasting two to four years. None of the selected CADs was found in the leaves, while
the inflorescences (stem and capitulum) contained only caftaric acid and echinacoside at concentrations
higher than the detection limits (0.05 mg g−1 dry weight). Echinacoside, cynarin and chlorogenic acid were
found in root tissues at concentrations ranging from 0.36 to 5.25 mg g−1 dry weight. In all plant samples,
echinacoside, which is the marker compound for E. angustifolia material, did not reach the minimum
quality standard (10 mg g−1 dry weight) for the production of standardized extract. We concluded that
short-cycle, high-density greenhouse hydroponic culture stimulates plant growth and root production
in E. angustifolia, but it does not ensure sufficient CADs accumulation in dried roots
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