1,721,132 research outputs found
Post-harvest foliar-applied Fe(II)-sulfate promotes Fe nutrition of pear trees grown in calcareous soil
No full textThe effectiveness of post-harvest foliar-applied Fe(II)-sulfate was assessed and indices were tested for precocious prognosis of Fe-chlorosis in field-grown pear trees. In a commercial pear (Abbé Fétel/BA 29) orchard, Fe-induced chlorotic trees were sprayed in early autumn with a Fe(II)-sulfate heptahydrate solution and compared with water-sprayed control trees. Leaf Fe concentration was higher in senescent and abscised leaves of Fe-sprayed trees, indicating that Fe was taken up. However, phytotoxic symptoms occurred and leaves fell earlier than in untreated trees. Fe(II)-sulfate spray increased Fe concentration of flower buds and fruiting spur leaves as well as leaf Chl values. Yield was increased in sprayed trees by about 13%, mostly associated with a higher fruit number per tree rather than fruit size, indicating an improved fruit set. We hypothesize that a fraction of the absorbed Fe contributed to sustain Fe requirements of the newly formed organs as from growth resumption. Summer leaf SPAD readings were positively correlated with Fe concentration of flower buds, fruiting spur leaves and, in particular, with senescent and abscised leaves. Our findings suggest the effectiveness of the post-harvest foliarly applied Fe(II)-sulfate to improve Fe nutrition of pear trees the following season. Rather than inducing a temporary re-greening, our approach is based on the fact that high Fe-rates sprayed before leaf fall may contribute to increase Fe pools within perennial organs. We propose utilizing leaf Fe concentration of senesced and abscised leaves as a predictive tool for the diagnosis of the Fe-chlorosis occurrence in pear trees
Surgical correction of lateral pharyngeal wall collapse in sleep related disordered breathing: functional expansion pharyngoplasty
No full textThe recent evolution regarding the techniques of pharyngoplasty has been focused on the concept of obtaining the expansion and stabilization of the pharyngeal airspace through the treatment of lateral pharyngeal wall (LPW) collapse rather than through ablation of the redundant pharyngeal soft tissue. The role of LPW in the pathogenesis of obstructive sleep apnea syndrome has been demonstrated by radiologic and sleep endoscopy studies and the narrowing of the LPW appears to be the sole independent risk factor for obstructive sleep apnea syndrome. The functional expansion pharyngoplasty represents a conservative modification of expansion sphincter pharyngoplasty and can be used in patients with obstruction of the upper airway due to the LPWs collapse without altering physiological functions of the upper airway, including smell, taste, swallowing, and speech
Root growth dynamic and plant performance of nectarine trees amended with biochar and compost
No full textA 2-year experiment was carried out outdoor on 1-year-old nectarine trees (Big Top grafted on Adesoto 101 Puebla (P. insititia) grown in large ((similar to)0.5 m(3)) pots filled with a sandy and poorly fertile soil in which, with 4 replicates, the following soil-applied amendment strategies were compared: a) unamended control; b) biochar (16.4 g kg(-1) (d.w.)); c) compost (40.0 g kg(-1) (d.w.)) and d) biochar mixed with compost, at the same rates of the previous two strategies. Only the first two strategies received mineral fertilizers. We monitored root growth dynamic and assessed tree growth, nutritional status, leaf photosynthetic rate, yield, fruit quality, tree architecture and tree biomass partitioning. Our findings demonstrate that benefits on soil properties and tree growth were mainly attributable to the addition of compost and, to a less extent, by biochar alone (mostly without significant effects), indicating that perennial agro-ecosystems may not immediately respond to biochar application. Strategies influenced root physiology rather than morphology or biomass, as a possible adaptation to the changed growing conditions. However, root growth pattern did not reflect the aboveground tree performance. Compost extended root lifespan and increased photosynthetic leaf efficiency, while biochar reduced root survivorship and increased root turnover, signifying that amendment strategies modify C fixation and alter C budget partitioning within tree organs. The PCA analysis suggests that biochar-induced benefits on tree yield could presumably occur over time. Tree physiology and performance were not outperformed by the mixture of the two amendments, likely because compost hindered potential synergism with biochar. While we conclude that the contemporaneous addition of biochar and compost may not always reflect additive responses on plant performance, we speculate that these matrices can be conveniently combined in the sustainable management of nectarine trees with the aim to replace mineral inputs, preserve soil fertility and fight climate changes
Functional expansion pharyngoplasty in the treatment of obstructive sleep apnea
No full textNO ABSTRAC
Public Policies for Sustainable Mobility: Recent Trends in Italy and Role of Integrated Tariff Systems
No full textLocalizzazione del silicio irrorato alla chioma nei tessuti delle ciliegie mediante criomicroscopia elettronica a scansione e microanalisi a raggi X
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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
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
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