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
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TL;DR: In this article, the resonance Raman spectra of the title compounds of the Tetraphenylarsonium and tetrahenylphosphonium were used to study the vibrational properties of the MnO ion in these lattices.
Abstract: Die Messung von Raman- und Resonanz-Raman-Spektren der Titelverbindungen ermoglichte weitere Einsicht in das schwingungsspektroskopische Verhalten des MnO-Ions in diesen Gittern. Aus den Resonanz-Raman-Messungen konnten weiterhin die Anharmonizitatskonstanten und harmonische Schwingungsfrequenzen fur die totalsymmetrische Valenzschwingung sowie die X13-Anharmonizitatskonstante ermittelt werden. Die Ergebnisse werden kurz besprochen.
Raman and Resonance Raman Spectra of the Permanganates of Tetraphenylarsonium and Tetraphenylphosphonium
The measurement of Raman and resonance Raman spectra of the title compounds allow a wider insight into the vibrational properties of the MnO ion in these lattices. The anharmonicity constants and harmonic vibrational frequencies for the totally symmetric stretching vibration as well as the X13 anharmonicity constant could be determined from the resonance Raman spectra. The results are briefly discussed.
5 citations
5 citations
TL;DR: Mean amplitudes of vibration for the pentagonal bipyramidal isoelectronic species TeF − 7, IF 7 and XeF + 7 have been calculated, over a wide temperature range, from recently reported vibrational spectroscopic and structural data as discussed by the authors.
5 citations
TL;DR: In this article, the vibrational spectra of a series of compounds of formula Ba10(ReO5)6X2 (with X F, Cl, Br, I, 1 2 CO2−3) belonging to the apatite structural type, as well as that of the defective Apatite Ba9 (ReO 5)6, are reported and briefly discussed.
5 citations
TL;DR: In this article, the infrared, Raman and 57 Fe-Mossbauer spectra of LaFeGe 2 O 7 and NdFeGe O 7 were recorded and analyzed on the basis of their structural characteristics.
5 citations
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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