Author
Enrique J. Baran
Other affiliations: Technical University of Dortmund, National Scientific and Technical Research Council
Bio: Enrique J. Baran is an academic researcher from National University of La Plata. The author has contributed to research in topics: Infrared spectroscopy & Raman spectroscopy. The author has an hindex of 32, co-authored 589 publications receiving 6392 citations. Previous affiliations of Enrique J. Baran include Technical University of Dortmund & National Scientific and Technical Research Council.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the Bastiansen-Morino shrinkage effect and the mean amplitudes of vibration of gaseous CrF4 were calculated from vibrational spectroscopic data, using the L-matrix method of A. Muller.
TL;DR: Mean amplitudes of vibration of molecules and ions containing interhalogen bonds are reviewed and critically analyzed in this article, where the presented information comprises pure inter-halogen compounds as well as oxohalides.
Abstract: Mean amplitudes of vibration of molecules and ions containing interhalogen bonds are reviewed and critically analyzed. The presented information comprises pure interhalogen compounds as well as oxohalides. Correlations between mean amplitude values and structural and bond properties are discussed. Comparisons with data of related – specially isoelectronic – species are also performed. Characteristic ranges for the mean amplitudes of vibration for halogen–halogen and halogen–oxygen bonds could be established. The presented and discussed results are also of central importance for the analysis and interpretation of electron diffraction studies.
TL;DR: In this article, a superexchange mechanism for polycrystalline R 2 Ba 2 CuPtO 8 (R =Ho, Er, Tm, Yb, Lu and Y) oxides has been proposed in which the Cu 2+ sublattice plays an important role as promoter of the antiferromagnetic interactions of ferromagnetic R 3+ coupled in the a-c plane of the structure.
TL;DR: In this article, an assignment of the electronic spectrum of the title compound, based on comparisons with spectral data of different CrO 3 X species, is proposed, and the resonance Raman results also support some of the proposals made.
Abstract: The resonance Raman and electronic spectra of the title compound have been recorded and briefly discussed. An assignment of the electronic spectrum, based on comparisons with spectral data of different CrO 3 X species, is proposed. The resonance Raman results also support some of the proposals made.
TL;DR: Mean amplitudes of vibration of the isostructural molecules HBCl2, HAlCl2 and HGaCl2 were calculated from spectroscopic data in a wide temperature range as mentioned in this paper.
Abstract: Mean amplitudes of vibration of the isostructural molecules HBCl2, HAlCl2 and HGaCl2 and of its deuterated analogous have been calculated from spectroscopic data in a wide temperature range. The results are briefly discussed and some comparisons with data of related species are also made.
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TL;DR: Aqueous V(III) Chemistry 877 6.2.1.
Abstract: 6.1.2. Aqueous V(III) Chemistry 877 6.1.3. Oxidation State of Vanadium in Tunicates 878 6.1.4. Uptake of Vanadate into Tunicates 879 6.1.5. Vanadium Binding Proteins: Vanabins 879 6.1.6. Model Complexes and Their Chemistry 880 6.1.7. Catechol-Based Model Chemistry 880 6.1.8. Vanadium Sulfate Complexes 881 6.2. Fan Worm Pseudopotamilla occelata 883 7. Vanadium Nitrogenase 883 7.1. Nitrogenases 883 7.2. Biochemistry of Nitrogenase 884 7.3. Clusters in Nitrogenase and Model Systems: Structure and Reactivity 885
1,184 citations
TL;DR: In this paper, the perovskite structure is used to illustrate the relationship of structure to composition, and the history of the fundamental science of structure-to-composition is described.
Abstract: Starting with the history of the fundamental science of the relation of structure to composition delineated completely by Goldschmidt, we use the perovskite structure to illustrate the enormous pow...
998 citations
TL;DR: Using a variety of approaches, researchers have begun to unravel the exquisite control mechanisms exerted by cells specialized for CaOx formation that include the machinery for uptake and accumulation of Ca, oxalic acid biosynthetic pathways, and regulation of crystal growth.
Abstract: Calcium oxalate (CaOx) crystals are distributed among all taxonomic levels of photosynthetic organisms from small algae to angiosperms and giant gymnosperms. Accumulation of crystals by these organisms can be substantial. Major functions of CaOx crystal formation in plants include high-capacity calcium (Ca) regulation and protection against herbivory. Ultrastructural and developmental analyses have demonstrated that this biomineralization process is not a simple random physical-chemical precipitation of endogenously synthesized oxalic acid and environmentally derived Ca. Instead, crystals are formed in specific shapes and sizes. Genetic regulation of CaOx formation is indicated by constancy of crystal morphology within species, cell specialization, and the remarkable coordination of crystal growth and cell expansion. Using a variety of approaches, researchers have begun to unravel the exquisite control mechanisms exerted by cells specialized for CaOx formation that include the machinery for uptake and accumulation of Ca, oxalic acid biosynthetic pathways, and regulation of crystal growth.
993 citations
01 Jan 1993
TL;DR: This work states that for many years, bone was defined anatomically and examined largely in a descriptive manner by ultrastructural analysis and by biochemical and histochemical methods, but now, complemented by an increased knowledge of molecular mechanisms that are associated with and regulate expression of genes encoding phenotypic compone...
Abstract: I. Introduction A FUNCTIONAL relationship between cell growth and the initiation and progression of events associated with differentiation has been a fundamental question challenging developmental biologists for more than a century. In the case of bone, as observed with other cells and tissue, the relationship of growth and differentiation must be maintained and stringently regulated, both during development and throughout the life of the organism, to support tissue remodeling. For many years, bone was defined anatomically and examined largely in a descriptive manner by ultrastructural analysis and by biochemical and histochemical methods. These studies provided the basis for our understanding of bone tissue organization and orchestration of the progressive recruitment, proliferation, and differentiation of the various cellular components of bone tissue. Now, complemented by an increased knowledge of molecular mechanisms that are associated with and regulate expression of genes encoding phenotypic compone...
982 citations
TL;DR: A complete chemical and physicochemical characterization of chitin, chitosan and their derivatives is not possible without using spectroscopic techniques, so this review focuses on the application of Spectroscopic methods for the structural analysis of these compounds.
Abstract: Chitin, the second most important natural polymer in the world, and its N-deacetylated derivative chitosan, have been identified as versatile biopolymers for a broad range of applications in medicine, agriculture and the food industry. Two of the main reasons for this are firstly the unique chemical, physicochemical and biological properties of chitin and chitosan, and secondly the unlimited supply of raw materials for their production. These polymers exhibit widely differing physicochemical properties depending on the chitin source and the conditions of chitosan production. The presence of reactive functional groups as well as the polysaccharide nature of these biopolymers enables them to undergo diverse chemical modifications. A complete chemical and physicochemical characterization of chitin, chitosan and their derivatives is not possible without using spectroscopic techniques. This review focuses on the application of spectroscopic methods for the structural analysis of these compounds.
848 citations