1,720,980 research outputs found
METAL-METAL INTERACTIONS IN COMPLEXES WITH A DOUBLE DIMETHYLSILANDIYL-BRIDGED DICYCLOPENTADIENYL LIGAND
No full textSIEMELING U, Jutzi P, BILL E, TRAUTWEIN AX. METAL-METAL INTERACTIONS IN COMPLEXES WITH A DOUBLE DIMETHYLSILANDIYL-BRIDGED DICYCLOPENTADIENYL LIGAND. JOURNAL OF ORGANOMETALLIC CHEMISTRY. 1993;463(1-2):151-154.The metal-metal interaction in the mixed-valence ferrocenium salt [trans-Cp*FeLFeCp*]+PF6- ([5(+)]PF6-) (Cp* = C(5)Me(5), L = [C(5)H(3)SiMe(2)](2)) was investigated by cyclic voltammetry, electron spectroscopy, EPR and temperature dependent Mossbauer spectroscopy. The compound is best described as a valence-localised system (class I according to Robin and Day)
Encapsulation of the transition metal compounds Carboplatin (CP) and Lobaplatin (LP) in different types ofliposomes and their physico-chemical, biochemical and biological characterization
No full textStructural Influence of Delocalized Electrons Studied by XAS
No full textMeyer-Klaucke W, Glaser T, Bill E, Wieghardt K, Trautwein AX. Structural Influence of Delocalized Electrons Studied by XAS. HASYLAB Jahresbericht. 1996;1996:811-812
EPR AND MOSSBAUER SPECTROSCOPIC STUDIES ON THE TETRAMERIC, NAD-LINKED HYDROGENASE OF NOCARDIA-OPACA-1B AND ITS 2 DIMERS .1. THE BETA-DELTA-DIMER - A PROTOTYPE OF A SIMPLE HYDROGENASE
No full textZABOROSCH C, KOSTER M, BILL E, Schneider K, SCHLEGEL HG, TRAUTWEIN AX. EPR AND MOSSBAUER SPECTROSCOPIC STUDIES ON THE TETRAMERIC, NAD-LINKED HYDROGENASE OF NOCARDIA-OPACA-1B AND ITS 2 DIMERS .1. THE BETA-DELTA-DIMER - A PROTOTYPE OF A SIMPLE HYDROGENASE. BIOMETALS. 1995;8(2):149-162.The cytoplasmic, tetrameric NAD-linked hydrogenase from Nocardia opaca Ib can be separated in two dimeric substructures, an ay-dimer with NADH:electron acceptor oxidoreductase (diaphorase) activity and a PG-dimer which displays hydrogenase activity with artificial electron carriers, These two dimers were preparatively isolated by a FPLC Mono Q procedure in the absence of nickel and at alkaline pH values, The hydrogenase-active PS-dimer contained, as analyzed by inductively coupled plasma mass spectrometry (TCP-MS), 3.5-3.9 iron atoms and 1.3-1.7 nickel atoms per dimer molecule, EPR and Mossbauer spectra indicated the presence of a [4Fe-4S] cluster, This center turned out to be extremely labile towards oxidants, Oxidation led to irreversible convertion into a [4Fe-4S] form, thus representing an artifact and not a regulatory state of the cluster, The midpoint redox potential of the [4Fe-4S] cluster was determined to be -385 mV, Very weak EPR Ni signals of the PG-dimer were detectable in the oxidized as well as in the reduced state, The diaphorase-active ay-dimer was free of nickel and the iron content corresponded to 11.2-12.8 Fe atoms per dimer molecule, From EPR and Mossbauer measurements it was concluded that this dimer contained two [4Fe-4S] clusters, one [2Fe-2S] and one [3Fe-4S] cluster, In accordance with the results obtained for the diner proteins, for the whole enzyme an iron content of 15.8-16.2 atoms per enzyme molecule have been determined, EPR spectra and spectrum simulations of the native hydrogenase corroborate the cluster assignments of the two dimers: in total the enzyme contains one [2Fe-2S] cluster, one [3Fe-4S] cluster and three [4Fe-4S] clusters
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
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