1,721,065 research outputs found
Effetti delle lavorazioni del terreno sugli apparati radicali e la crescita di una coltura di mais: studio triennale e simulazione a lungo termine nel Bacino scolante nella laguna di Venezia
Full text linkThe work regards the effect of tree different land management techniques (conventional tillage, minimum tillage and no-tillage) on some biometric characteristics of a corn culture. This tree year work, done in a farm located in a draining basin of the Venetian lagoon, had the aim to individuate the influences of the different tools and of the different management techniques on the plant growth and if there could be some feedbacks on the production.
The data have been collected during the first two years, while during the third one the surveys continued to have a global and precise view of the effects obtainable with the different techniques. The collected data, for what concerns the plant, regard some soil proprieties (bulk density, humidity) at different depths, biomass, foliar development and root growth. The surveys, when considered suitable, have been done all year round (2005/2006) and especially during tree specific phases, when the plant had 2-3 leafs on, at 7-8 leafs end during blooming so it was possible to compare different years. Even the emerging speed, the seed density and the different productions divided by working techniques were collected.
At the same time all the data collected on the climate, on the soil and on the other cultural operations done were needed to calibrate the simulation model "Salus", that contains a special package on the different working techniques, and that permits to estimate the plant responses, the environmental impacts and the soil evolution at each climatic change. The results of the model, first of all used to calibrate the model itself, have been then used to evaluate the answers in a long term (15 years) of the tree different working techniques on the production, on the Carbon heap and on some soil characteristics
Evidence for an association between alcohol intake and an increased risk of nonmelanoma skin cancer
Full text linkMesothelioma among seamen: a systematic review and meta-analysis
Full text linkObjectives: Navy personnel and seafarers live and work 24 h per day in the shipboard environment and they are exposed to asbestos fibers released into the confined spaces aboard ships. We conducted a systematic review and meta-analysis to quantify the mesothelioma risk of seamen working aboard ships, either commercial or naval vessels, as compared to that of the general population. Methods: We carried out a literature search in MEDLINE through PubMed and EMBASE, from inception to 31 December 2021, of all studies on seamen working aboard ships, either commercial or naval vessels, characterized by exposure to asbestos and providing mesothelioma risk estimates. The Newcastle-Ottawa Scale was used to assess the quality of the studies included. The pooled standardized mortality ratio (SMR) was computed across eligible studies. The study protocol was registered on PROSPERO and reporting followed the preferred reporting items for systematic reviews and meta-analyses guidelines. Results: A total of 10 studies published from 1990 to 2020 were considered eligible and included in the systematic review and meta-analysis. All the included studies were of good quality, with a median score of seven out of nine. Overall, there were 235 mesothelioma cases/deaths in the included studies versus 115.6 expected, with a pooled SMR of 2.11 (95% confidence intervals, 1.70-2.62), in the absence of a significant between-study heterogeneity (I2 = 39%, P = 0.11). Conclusion: A more than double excess risk for mesothelioma among seamen working aboard ships emerged from our meta-analysis
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
No gender differences in growth patterns in a cohort of children with cystic fibrosis born between 1986 and 1995
No full textBackground & aims: A higher mortality rate at young ages has been reported in cystic fibrosis (CF) girls compared to boys. The reasons of this gap remain unclear but may be related to a different evolution of the disease, in terms of growth and lung function throughout childhood and adolescence. This study aimed at investigating gender differences in growth patterns in a cohort of children with CF through a longitudinal study, and as secondary objectives, to evaluate gender differences in forced expiratory volume in one second (FEV1) trend and transplant-free survival. Methods: We performed an historical cohort study of 203 CF patients born between 1986 and 1995. Weight and height were recorded from the time of CF diagnosis to the age of 18 years. Generalized estimated equations were used to evaluate the effect of gender on changes in z-score of BMI-for-age and z-score of height-for-age and FEV1. Transplant-free survival to age 18 was computed by the Kaplan–Meier estimator. Results: Girls did not show a worse growth pattern as compared to boys. The odds of being underweight [Odds Ratio (OR) for girls: 0.85, 95% CI: 0.51; 1.39] or stunted [OR for girls: 0.79, 95% CI: 0.42; 1.49] were not significantly different between genders. FEV1 trend was also similar in boys and girls, as well as the probability of surviving to age 18 without receiving lung transplantation (boys: 0.88, 95% CI: 0.82–0.95, girls: 0.92, 0.87–0.98, P = 0.26). Conclusions: In a cohort of children with CF born between 1986 and 1995, no gender differences in growth patterns were observed. This finding suggests that CF girls and boys have benefited equally from the advances in treatments that have occurred over the last three decades
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
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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