1,721,069 research outputs found
FUNCTIONAL ANALYSIS OF THE PROMOTER OF THE MITOCHONDRIAL PHOSPHATE CARRIER HUMAN GENE
No full textINTRODUCTION: The phosphate carrier (PiC) is a nuclear encoded protein that belongs to the mitochondrial carrier protein family. Its physiological role is to catalyze the transport of inorganic phosphate into the mitochondrial matrix (1). Uptake of phosphate into mitochondria is essential for the oxidative phosphorylation of ADP to ATP. Only one human gene for the PiC, that give rises to two alternatively spliced isoforms (A and B), has been detected.. The recombinant, reconstituted isoforms A and B exhibit similar substrate specificity and inhibitor sensitivity, but differ in their kinetic parameters and tissue distribution (2). We have analyzed the 5’-flanking region of the human PiC gene and have identified a single transcriptional initiation site, an activation domain and an inhibition domain (3).
MATERIALS AND METHODS: Materilas and methods employed are reported in ref. 3.
RESULTS: Through deletion analysis of the 5’ flanking regulatory region (-1213/-25 bp) and transient transfection of HeLa cells we have identified two distinct domains in the promoter of the PiC gene: an activation domain (-223/-25) and a inhibition domain (-1017/-814). The activation domain binds Sp1 and CREB with high specificity, as demonstrated by EMSA competion experiments. The CREB element is important not only for basal expression, but also for induced expression through the cAMP/protein kinase pathway. In fact, upon stimulation with foskolin, an activator of adenylate cyclase, we observed a clear increase in the level of both PiC mRNA and PiC protein and a two-fold activation of CAT expression. The silencer region was also characterized.. By Southwestern experiments two polypeptides (about 100 kDa and 55 KDa, respectively) were found to bind to a region of 25 nucleotides (from -943 to -919 bp). These two proteins were purified and identified as PSF (protein associated splicing factor) (100KDa) and p54 nrb/NonO (55KDa) by mass spectrometry. These findings may provide insight into the control of PiC gene expression.
1. Palmieri, F. (2004) Pflugers Arch. 446, 689-709
2. Fiermonte, G., Dolce, V., and Palmieri, F. (1998) J. Biol. Chem. 273, 22782-22787
3. Iacobazzi V, Infantino V, Costanzo P, Izzo P, and Palmieri F. (2005) Biochem. J., in press
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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