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The photosensitive ESR signals of singly negatively charged zinc vacancies (V Zn−, (V Zn−) 2− and interstitial oxygen ions in a tetrahedral surrounding (O itetr−) are detected in undoped ZnO ceramic and their optical excitation and quenching behaviour is studied using the photo‐ESR method. The investigations show that all these defects are filled by electrons and have a concentration comparable to that of the oxygen vacancies. The photo‐ESR experiments allow to arrange both defects in the energy‐band diagram energetically. In contrast to electron irradiated ZnO single crystals the neutral zine vacancy (V ZnI can only he detected under intensive optical illumination at T = 7 K.

RESUMOA diabetes mellitus canina vem aumentando no sul do Brasil. Na etiologia, obesidade, vida sedentária e estresse são os principais fatores. Após o diagnóstico recomenda-se identificar doenças que possam causar intolerância à glucose. Para este fim, perfil bioquímico sérico, urinálise e hemograma devem ser determinados. O objetivo deste trabalho foi identificar as principais alterações clínico-patológicas de cães diabéticos e estabelecer valores de referência para fructosamina. Dez cadelas atendidas por um hospital veterinário universitário do sul do Brasil foram incluídas no estudo para realizar hemograma, testes bioquímicos e urinálise. Foram dosados no soro creatinina, uréia, ALT, AST, GGT, ALP, albumina, proteína total, globulinas, colesterol, triglicerídeos, β-OH-butirato, amilase pancreática, glicose e fructosamina. Vinte e cinco cães sadios foram usados como controle. O hemograma mostrou leucocitose em 30% dos cães diabéticos. Foi observada glicosúria em todos os cães. Proteinúria (50%), cetonúria (40%) e alta densidade urinária (30%) foram as maiores alterações da urina dos animais diabéticos. As concentrações de glicose e colesterol estiveram acima dos valores de referência em todos os diabéticos. Os triglicerídeos foram mais altos, comparados com o grupo controle, em 90% dos cães diabéticos. Altos valores de proteína total (70%), FAS (70%), GGT (50%), ALT e β-OH-butirato (40%) foram observados nos cães com diabetes. A concentração sérica de fructosamina nos animais do grupo controle foi de 1.53 mmol/L ± 0.27 e nos diabéticos de 3.24 mmol/L ± 1.16. ABSTRACTCanine diabetes mellitus has increased in southern Brazil. In the etiology, obesity, sedentary life and stress appear to be the main factors. After diagnosis is recommended to identify concurrent diseases that cause glucose intolerance. For this purpose, serum biochemical profile, urinalysis and complete blood count (CBC) must be determined. The aim of this study was to identify the most common clinical pathological changes in diabetic dogs from an university veterinary hospital in southern Brazil, and to establish fructosamine reference values. Ten diabetic female dogs attended at the veterinary hospital were included in this study to perform CBC, biochemical assays and urinalysis. Creatinine, urea, ALT, AST, GGT, ALP, albumin, total protein, globulins, cholesterol, triglycerides, β-OH-butyrate, pancreatic amylase, glucose and fructosamine were measured in serum. Twenty-five healthy dogs were used as control for values. CBC showed leucocytosis in 30% of diabetic dogs. Glycosuria was observed in all dogs. Proteinuria (50%), ketonuria (40%) and high urine density in 30% of the animals, were the main alterations of urine in diabetic dogs. Serum glucose and cholesterol concentrations were above reference values in all diabetic dogs. Triglycerides were higher than control dogs in 90% of diabetic dogs. High values of total protein (70%), ALP (70%), GGT (50%), ALT and β-OH-butyrate (40%) were observed in diabetic dogs. Control group had a mean fructosami...

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ESR measurements of the oxygen vacancy V 0+ are performed on undoped ZnO ceramics and on Bi2O3‐doped ZnO ceramics additionally heat‐treated in reducing atmosphere. The temperature dependences of the relative signal intensity and the line width of the ESR signal are investigated in both the samples. By the measurement of the temperature dependent relative intensity of the ESR signal of the V 0+ center the ionization energy of the V 0x center is obtained. An analysis of the temperature dependence of the line width of the ESR signal of the V 0+ center in the Bi2O3‐doped ZnO ceramics shows that V 0+ centers produced by reducing subsequent heat treatment are localized at the boundary layer of the ZnO grains in high local concentrations.

The magneto-transport properties of single proton-implanted ZnO and of Li(7%)-doped ZnO microwires have been studied. The as-grown microwires were highly insulating and not magnetic. After proton implantation the Li(7%) doped ZnO microwires showed a non-monotonous behavior of the negative magneto-resistance (MR) at temperature above 150 K. This is in contrast to the monotonous NMR observed below 50 K for proton-implanted ZnO. The observed difference in the transport properties of the wires is related to the amount of stable Zn vacancies created at the near surface region by the proton implantation and Li doping. The magnetic field dependence of the resistance might be explained by the formation of a magnetic/non-magnetic heterostructure in the wire after proton implantation.