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

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The chemistry and biochemistry of vanadium and the biological activities exerted by vanadium compounds.

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...

The perovskite structure—a review of its role in ceramic science and technology

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.

CALCIUM OXALATE IN PLANTS: Formation and Function

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...

Molecular mechanism mediating proliferation, defferentiation interralationships during progressie development of the osteoblast phenotype

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.

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Application of Spectroscopic Methods for Structural Analysis of Chitin and Chitosan

The electrochemical behavior of ethylic esters of the type Q2VO(OEt), derived from the oxo-vanadium(V) complex Q2VO(OH) (Q = 8-hydroxyquinoline, 5-chloro and 5, 7-dichloro-8-hy-droxyquinoline or 2-methyl-8-hydroxyquinoline), was investigated by cyclic voltamperometry in organic solvents. The detailed analysis of the results confirmed the generation of different complex species in solution. The presence of water in the solvents modifies the electrochemical behavior, as a consequence of the formation of a mixed valence dimer of the type [Q2VO-O-OVQ2]−. The somewhat different behavior of the 2-methyl-8-hydroxyquinoline derivative could also be explained. The analysis of the electronic spectra of the investigated solutions, after and during the electrochemical measurements, gave additional support to some of the proposed reactions, steps and mechanisms.

Electrochemical behavior of some inorganic esters of oxovanadium(v)

Infrared and electronic spectra of Auranofin

Fil: Parajon Costa, Beatriz Susana. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - La Plata. Centro de Quimica Inorganica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Quimica Inorganica "Dr. Pedro J. Aymonino"; Argentina

/pdf/synthesis-and-characterization-of-a-zinc-ii-complex-of-29ehkyur5m.pdf

Synthesis and Characterization of a Zinc(II) Complex of Bispicen

Simultaneous strontium and zinc substitution for calcium in the fluoroapatite lattice was investigated. Crystallographie data for different members of the series Ca 10 x−y Sr- x Zn y (PO 4 ) 6 F 2 were obtained from X-ray powder diagrams. The effects of the substitutional process on the strength of the phosphate P-O-bonds were checked by Raman spectroscopy

Enrique J. Baran

Papers

Electrochemical behavior of some inorganic esters of oxovanadium(v)

Infrared and electronic spectra of Auranofin

Synthesis and Characterization of a Zinc(II) Complex of Bispicen

Röntgenographische und spektroskopische Untersuchung einiger Strontium- und Zink-substituierten Calcium-Fluorapatite

A new acesulfamato complex: [Cu(acesulfamato)2(H2O)4]. Structural and spectroscopic characterization