1,721,072 research outputs found
The Solution Structure of [ala4]-desdimethylchlamydocin - A H-1-nmr Relaxation Study
No full textMany fungal peptides exhibit plant toxicity in a host-specific manner. Here we report a proton relaxation and two dimensional (2D) n.m.r. study of the [Ala4]-desdimethyl analogue of the fungal tetrapeptide chlamydocin. Interproton distances calculated from n.m.r. parameters agreed substantially with the corresponding distances in the crystalline form of dihydrochlamydocin. A solution conformational analysis was performed based on n.m.r. distance measurements and φ, ψ, and ω angles of the four residues plus χi rotamer populations. These data support the use of proton relaxation parameters as a basis for accurate solution conformational analysis. As a corollary, the data can also indicate within experimental error that the crystal and solution conformations of chlamydocin and the [Ala4]-desdimethyl analogue, respectively, are identical
STUDIO DELLA FUNZIONE OLFATTIVA DI UN GRUPPO DILAVORATORI CON RILEVANTE ESPOSIZIONE A PIOMBO [Study of the olfactory function of a group of workers with significant lead exposure] In Italian.
No full text
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
Laparoscopic adrenalectomy for hemorrahagic adrenal pseudocyst discovered during pregnancy: Report of a case
No full textAdrenal pseudocysts are rare cystic masses usually nonfunctional and asymptomatic, discovered incidentally during diagnostic imaging or when complicated by rupture and hemorrhage or infection. Few cases of hemorrhagic adrenal pseudocyst during pregnancy are reported, but a causal relationship between pregnancy and pseudocyst formation has not been shown. We describe a case of a 30-year-old pregnant woman referred to our surgical unit at the 20th week of gestation for incidental detection of left-side upper abdominal cystic mass, with signs of intralesion hemorrhage. The lesion was monitored and the woman gave birth at the 39th week, without complications. After 3 months from delivery, a multislide computed tomography scan confirmed a cystic mass measuring 10 x 7 x 10 cm. An elective transperitoneal laparoscopy was performed and a well-capsulated, hemorrhagic adrenal pseudocyst was removed. The optimal surgical treatment for hemorrhagic adrenal pseudocyst during pregnancy is still controversial. The present case shows that adrenal pseudocyst should be carefully monitored and can be treated by elective laparoscopic surgery after delivery
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