1,721,001 research outputs found
Veiling and Undveiling in Italian Manuscripts of the Second Half of Fifteenth Century
No full textThis essay deals with the issue of materiality in painted images of manuscripts and incunabula realized in Veneto or Northern Italy, in the second half of the fifteenth century.
It is well known that, in this area and in this period, painters, in tune with their patrons, carried out several studies on illusionism coupled with a deep concern for optical perspicuity and material rendering. This way, through illustrations, the written page became an open window on the three-dimensional reality. At the same time, illuminators wanted to make clear that even the most perfect illusions were actually painted images and, therefore, fictions by their own nature.
From this concept comes the title of this lecture that includes the words ‘veiling’ and ‘unveiling’ thus suggesting how the artists interpreted the game between reality and fiction developed through the visual language.
The codices here chosen are manuscripts preserved in Wolfenbüttel. In particular Cod. Guelf. 6 Gud. lat.; Cod. Guelf. 332 Gud. lat.; Cod. Guelf. 126 Gud. lat.; Cod. Guelf. 85.I.I. Aug. 2°. The intent is to analyze the illuminations here contained from the point of view of simulation and dissimulation of the depicted reality
Molecular and physiological responses to salt stress in salinity-sensitive and tolerant Hibiscus rosa-sinensis cultivars
No full textOrnamental plants are used to decorate urban and peri-urban areas, and during their cultivation or utilisation, they can be exposed to abiotic stress. Salinity is an abiotic stress factor that limits plant growth and reduces the ornamental value of sensitive species. In this study, transcriptomic analysis was conducted to identify genes associated with tolerance or sensitivity to salinity in two hibiscus (Hibiscus rosa-sinensis L.) cultivars, ‘Porto’ and ‘Sunny wind’. The physiological and biochemical parameters of plants exposed to 50, 100, or 200 mM NaCl and water (control) were monitored. Salinity treatments were applied for six weeks. After four weeks, differences between cultivars were clearly evident and ‘Porto’ was more tolerant than ‘Sunny wind’. The tolerant cultivar showed lower electrolyte leakage and ABA concentrations, and higher proline content in the leaves. Accumulation of Na in different organs was lower in the flower organs of ‘Porto’. At the molecular level, several differential expressed genes were observed between the cultivars and flower organs. Among the highly expressed DEGs, coat protein, alcohol dehydrogenase, and AP2/EREBP transcription factor ERF-1. Among the downregulated genes, GH3 and NCED were the most interesting. The differential expression of these genes may explain the salt stress tolerance of ‘Porto’. Graphical Abstract: [Figure not available: see fulltext.]
Hydro-retention polyacrylamide gels amendment to potting media increase water availability
No full textThe aim of the paper is to clarify the advantages for the hard ornamental nursery stocks and for the environment derived from the addition of two commercial hydrophilic polyacrylamide gels to a peat/pumice (1:1 V/V) substrate. Also tomato crop was investigated. In both cases, the water absorption capacity of the two hydrophilic polyacrylamide gels was proportionally reduced with the presence of dissolved salts in the water. It was found that in the tested substrate an addition of 2 g L-1 of super-water-retention gel can increase the amount of retained water by about 130 g for each liter of substrate. However, only 40-50% of the higher amount of water retained by super-water retention was available for the crop. Under the operating conditions (drip irrigation with relatively saline water) the increase of water available for the crop (in the range 0-10 kPa) is only about 30 g for each gram of polymer added to the substrate. This higher substrate available water amount could increase the resistance of the plants to the absence of irrigation for 1-2 days. In conclusion, the addition of hydrophilic polyacrylamide gels to the substrate seems to have positive effects on plants, especially after the end of cultivation (selection and preparation of plants, packaging, storage, transport) and, probably, also during the early stages after transplanting in the customer's garden, where optimal irrigation could be not always guaranteed
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
Short Lecture "Phytochemical, nutritional, and mineral content of four edible flowers"
No full textThe consumption of flowers as food dates to ancient Greek and Rome and survives to the present day as part of the traditional cuisine of different countries [1]. The consumption of edible flowers (EFs) is significantly increased in the last few years, due to both their numerous healthy compounds and the heightened awareness of people to the food quality [1]. In this context four EFs were investigated to evaluate their aromatic profile and their nutritional value. The studied species were Dianthus chinesis L., Viola cornuta L., Fucsia regia (Vand. Ex Vell.) Munz and Cucurbita moschata Duchesne. p-Dimethoxybenzene (77.5%), cis-hexenyl acetate (31.2%) and decanal, non-terpene compounds, were the main constituents in volatile profile (by HS-SPME analysis) of C. moschata and D. chinensis, and F. regia, respectively. On the contrary V. cornuta was rich in terpenes mainly represented by myrcene (36.7%) and α-farnesene (34.5%). The extraction of the essential oil (EO) was carried out on C. moschata, D. chinensis, and V. cornuta. The EOs of the first two species maintained the prevalence of non-terpenes even though heneicosane (34.9%) and behenic alcohol (39.6%) becomes the principal ones, respectively, while Viola EO was rich in (E)-palmitoleic acid (31.3%). From the nutritional point of view, F. regia have the most interesting flowers, with the highest content of polyphenols, anthocyanins, calcium, iron, and zinc. D. chinensis contains the higher soluble sugars, and common C. moschata flowers contain high quantities of crude proteins, phosphorous, potassium and magnesium and low content of secondary metabolite
Appropriate 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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