Crystal structures of Sr4(Sr2Ta2)O11 and Sr4(Sr1.92Ta2.08)O11.12, synthesized by solid state reaction technique in dry and hydrated state have been studied mainly using Transmission Electron Microscopy. Due to the lesser ability of X-rays to probe details in oxygen sublattice, the change in crystal symmetry due to ordering of oxygen vacancies could be detected better using Transmission Electron Microscopy. After detailed analysis through TEM, it was observed that no major change occurs in the cation sublattice. The TEM observations are compared with XRD data and discussed. The crystal symmetries and corresponding unit cells of all the perovskites based on the ordering of oxygen vacancies is deduced. Crystal unit cells based on the observations are proposed with ideal atomic coordinates. Finally an attempt is made to explain the water uptake behaviour of these perovskites based on the proposed crystal structure.
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http://dx.doi.org/10.1016/j.micron.2014.02.013 | DOI Listing |
Appl Environ Microbiol
December 2024
Institute of Environmental Sciences, Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University, Rehovot, Israel.
Antibiotic secretion plays a pivotal role in bacterial interference competition; yet, the impact of environmental hydration conditions on such competition is not well understood. Here, we investigate how hydration conditions affect interference competition among bacteria, studying the interactions between the antibiotic-producing FZB42 and two bacterial strains susceptible to its antibiotics: 85-10 and DC3000. Our results show that wet-dry cycles significantly modify the response of the susceptible bacteria to both the supernatant and cells of the antibiotic-producing bacteria, compared to constantly wet conditions.
View Article and Find Full Text PDFACS Macro Lett
December 2024
Department of Chemical Engineering, The University of California, Santa Barbara, Santa Barbara, California 93106, United States.
Ion-containing polymers are subject to a wide range of hydration conditions across electrochemical and water treatment applications. Significant work on dry polymer electrolytes for batteries and highly swollen membranes for water purification has informed our understanding of ion transport under extreme conditions. However, knowledge of intermediate conditions (i.
View Article and Find Full Text PDFJ Chem Phys
December 2024
Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
For many technological processes, the impact of water addition on the properties of deep eutectic solvents is of central importance. In this context, the impact of hydration on the reorientational dynamics of the deep eutectic solvent (DES) ethaline, a 2:1 molar mixture of ethylene glycol and choline chloride, was studied. Its overall response was explored by means of shear mechanical rheology.
View Article and Find Full Text PDFFront Pharmacol
December 2024
Department of Dermatology, Ganzhou People's Hospital, Ganzhou, China.
Atopic dermatitis is an inflammatory skin condition characterized by erythema, eruption, lichenification, and pruritus. Aged Abel oil, an effective empirical plant oil utilized by the Gannan Hakka people in China to alleviate the symptoms of atopic dermatitis. However, no scientific studies have been reported to prove whether this oil is truly effective.
View Article and Find Full Text PDFSci Total Environ
December 2024
Guangzhou Municipal Construction Group Co., Ltd., Guangzhou, China.
Rice husk ash is an industrial waste produced by biomass power plant to generate electricity, which contains a lot of silica. The accumulation of rice husk ash not only consumes land resources, but also causes environmental pollution. It is an urgent problem to explore the resource utilization of rice husk ash.
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