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

SUMMARY. The tittle hydrogen selenites were obtained and characterized by X-ray powder diffractometry and infrared spectroscopy. Their thermal behaviour was investigated by means of TG and DTA measuremenis. Several dissolution tests were also performed. The results support the potential usefulness of these salts for selenium supplementation in human and veterinary medicine and to the simultaneous reinforcement of Mg(ii) and CuflI) levels. RESUMEN. '6Mg(Se03R)2.4H20 y CU(S~O~H)~.~H~O: Compuestos Potencialmente Utiles para la Suplementacion de Selenio". Los selenitos acidos del tihilo fueron obtenidos y caracterizados por difractometrfa de rayos X de polvos y espectroscopia de infrarrojo. Su comporiamiento termico fue investigado a traves de medidas TG y ADT. Asimismo, se realizaron diversos ensayos de disolucion. Los resultados apoyan la potencial utilidad de ambas sales para la suplementacion de selenio en medicina humana y veterinaria, asi como para reforzar simultaneamente los niveles de Mg(II) y Cu(ii). INTRODUCIlON Supplementation of essential trace or rnicro

http://www.latamjpharm.org/trabajos/20/3/LAJOP_20_3_1_12_U41Q4L42C7.pdf

Mg(Se03H)2.4H20 and CU(S~O~H)~.~H~O: Potentially Useful Compounds for Selenium Supplementation

Orthovanadates and related compounds, 26. the ir spectra of cobalt, nickel and zinc orthovanadates

Orthovanadates and related compounds. xii. lead orthovanadate and some vanadium-lead compounds with the apatite structure

It has been recently found that bis(pyrro1idine-N-carbodithioato)-oxovanadium (IV) is an orally active insulin-mimetic complex. In order to facilitate the characterization and rapid identification of this interesting drug, we have recorded its infrared and Raman spectra and made an assignment of its most characteristic bands. On the basis of this analysis some structural peculiarities of the complex are also discussed. RESUMEN. "Espectro Vibracional de Bis(pirro1idinio-N-carboditioato)oxovanadio (IV): Un Nuevo Complejo Insulino-Mimético de Vanadilo". Recientemente se ha demostrado que el bis(pirro1idinio-N-carboditioat0)-0x0vanadio (IV) es un complejo con actividad iiisulino-mimética, administrable oralmente. A efectos de facilitar la caracterización y rápida identificación de esta interesante droga, hemos registrado sus espectros infrarrojo y Raman y realizado la asignación de sus bandas más características y en base a este análisis se discuten algunas peculiaridades estructurales del complejo.

Enrique J. Baran

Papers

Mg(Se03H)2.4H20 and CU(S~O~H)~.~H~O: Potentially Useful Compounds for Selenium Supplementation

Orthovanadates and related compounds, 26. the ir spectra of cobalt, nickel and zinc orthovanadates

Orthovanadates and related compounds. xii. lead orthovanadate and some vanadium-lead compounds with the apatite structure

Vibrational Spectrum of Bis (pyrrolidine-N-carbodithionato) - oxovanadium(IV): A New Insulin-Mimetic Vanadyl Complex

Crystallographic and Spectroscopic Behaviour of Some Mixed Phosphate/Vanadate Fluoroapatites.