117,317 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
QUAL’ È LA REALE ASSOCIAZIONE TRA LINGUA A CARTA GEOGRAFICA E PSORIASI? UN PICCOLO STUDIO EPIDEMIOLOGICO
No full textAim: Psoriasis is a inflammatory, chronic skin-articular disease with genetic and immunological basis. Psoriasis occurs in approximately 1-3% of the world
population, affecting white individuals of both sexes. Its etiology is unknown: there is a defect in the normal cycle of epidermal development, with a leukocyte
infiltrate. Psoriasis can be localized or generalized, affecting almost all the skin with an unpredictable course. Several studies show that geographic tongue
is the oral manifestation more commonly associated with psoriatic disease. The geographic tongue (GT) is a chronic, inflammatory oral lesion, immunologically
mediated and with unknown etiology. It affects the 0.6%-4.8% of the world population. It is characterized by slightly eroded areas with depapillated mucosa
often but not always, with white sclerotic border around. The difficulty however in accepting the diagnosis of geographic tongue as oral psoriasis is the fact that not all patients with geographic tongue present psoriasis. Recent studies have investigated
the role of anxiety, depression, stress and psoriasis. Depression and stress decrease the quality of life and this fact in patients with psoriasis is directly associated
with the severity of the disease. The role of vitamin D deficiency was also investigated. Hypovitaminosis D has been associated with a variety of autoimmune
diseases such as rheumatoid arthritis, Crohn’s disease, systemic lupus erythematosus, and osteoporosis. In addition, vitamin D deficiency is often associated with skin disorders, such as pemphigus vulgaris, bullous
pemphigus, alopecia areata, vitiligo and psoriasis. Some studies have identified an association between polymorphisms of vitamin D receptor (VDR) and the
severity of psoriasis disease, believing it affects the alteration of the cutaneous barrier. The aim of this work is to evaluate the relationship of these conditions
in a small sample population. Methods: The tongue of 52 patients with a diagnosis of
psoriasis (32 women and 20 men) aged between 9 and 64 years was carefully checked in a dermatological private practice, than in a dental private practice
to evaluate the presence or absence of migratory glossitis. Results: Of the 52 patients visited, 8 (15,2%) of them (5 women and 3 men) presented a tongue
with the characteristics of GT. Several studies have highlighted the association between cutaneous psoriasis and geographic tongue. Common features
are the clinical presentation, the histological pattern and the presence of common genetic markers (HLA). We have found a percentage of GT in psoriatic patient
higher than the association found in previous works in the scientific literature. However, it is true that not all the people who show a geographic tongue have
psoriasis.Despite this, the presence of geographic tongue may be an early sign of psoriasis. Several studies have shown that early diagnosis of psoriasis can reduce the risk of complications and damage and functional disability due to psoriasis. Therefore the clinician, in particular the dentist, should always investigate more thoroughly when a patient with a geographic tongue appears at the first visit.
Conclusions: General practitioners and dermatologists are encouraged to perform a detailed oral examination of psoriatic patients, in the same way dentists are
advised to recommend a dermatological examination to patients with a geographic tongue
Innovative procedures based on advanced mesoscale simulation techniques for functional polymers in automotive industry
No full textRisk of infectious mononucleosis among agonistic swimmers: a cross-sectional study
No full textBACKGROUND:
The risk of infectious mononucleosis among athletes is quite debated. Some personal observations seem to suggest an increase risk of mononucleosis among athletes, because they attend always close settings with an high probability of respiratory pathogens transmission; overtraining has been also proposed as risk factor.
STUDY DESIGN:
Cross-sectional study in a group of swimmers (aged 11-14 years) of the University Sport Centre of Bari.
METHODS:
40 swimmers were interviewed by healthcare personnel at the end of training courses; demographic characteristics, personal habits, information about sport training and diagnosis of mononucleosis were analysed.
RESULTS:
The life-time incidence of mononucleosis was around 40%; multivariate analysis showed the association between mononucleosis and use of bottles of other persons (aOR=8.2; 95% CI=1.4-49.2; z=2.32; p=0.021) and average duration of training session was longer among subjects who reported mononucleosis than in subjects who did not indicate this disease.
CONCLUSIONS:
Future multi-centric studies are needed to better define the epidemiology of the mononucleosis in sport settings and to formulate appropriate recommendations to prevent the spreading of this disease
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
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