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141.
O. V. Nipruk N. G. Chernorukov A. A. Volochai M. I. Arova 《Russian Journal of General Chemistry》2013,83(4):636-641
The state of uranyl orthovanadate (UO2)3(VO4)2·4H2O in aqueous solutions was studied by the methods of chemical analysis, X-ray diffraction, and IR spectroscopy. Uranyl vanadate is transformed into compounds of other composition and structure upon contact with aqueous phases of various acidity. Equilibrium constants of reactions occurring in heterogeneous systems (UO2)3(VO4)2·4H2O-aqueous solution were calculated from the data on the solubility. Phase diagrams of bottom solid phases and of equilibrium aqueous solutions were constructed. 相似文献
142.
Wiens M Belikov SI Kaluzhnaya OV Adell T Schröder HC Perovic-Ottstadt S Kaandorp JA Müller WE 《Micron (Oxford, England : 1993)》2008,39(4):447-460
Some sponges [phylum Porifera], e.g. the demosponges Lubomirskia baicalensis or Axinella polypoides, show an arborescent growth form. In the freshwater sponge L. baicalensis this morphotype is seen mostly in depths below 4m while in more shallow regions it grows as a crust. The different growth forms are determined in nature very likely by water current and/or light. The branches of this species are composed of modules, arranged along the apical-basal axis. The modules are delimited by a precise architecture of the spicule bundles; longitudinal bundles originate from the apex of the earlier module, while at the basis of each module these bundles are cross-linked by traverse bundles under formation of annuli. Genes encoding putative morphogenetic factors, myotrophin and epidermal growth factor (EGF)-like molecules, and one gene of an antagonist for the Wnt signaling pathway, the soluble frizzled molecule, have been identified and characterized. Their expression levels as well as those of silicatein, one major spicule-forming molecule, have been studied in the crusts and the modules. The data revealed that at the apices of each module higher level of expression of myotrophin and EGF can be detected, while the base of each module is characterized by a high steady-state expression level of soluble frizzled molecule. These results suggest that module formation in L. baicalensis is controlled by a tuned interaction of agonistic (e.g., myotrophin and EGF) as well as antagonistic morphogenetic factors (e.g., soluble frizzled molecule). 相似文献
143.
Dr. Luzia S. Germann Dr. Elvio Carlino Dr. Antonietta Taurino Dr. Oxana V. Magdysyuk Prof. Dario Voinovich Dr. Robert E. Dinnebier Dr. Dejan-Krešimir Bučar Dr. Dritan Hasa 《Angewandte Chemie (International ed. in English)》2023,62(19):e202212688
Crystal engineering has exclusively focused on the development of advanced materials based on small organic molecules. We now demonstrate how the cocrystallization of a polymer yields a material with significantly enhanced thermal stability but equivalent mechanical flexibility. Isomorphous replacement of one of the cocrystal components enables the formation of solid solutions with melting points that can be readily fine-tuned over a usefully wide temperature range. The results of this study credibly extend the scope of crystal engineering and cocrystallization from small molecules to polymers. 相似文献