ABSTRACT
The magnetic properties and magnetocaloric effect (MCE) in Pr0.65Ca0.25Ba0.1MnO3 have been investigated supplemented by electrical data. X-ray diffraction shows that the sample crystallizes in the distorted orthorhombic system with the Pnma space group. Pr0.65Ca0.25Ba0.1MnO3 undergoes paramagnetic-ferromagnetic (PM-FM) phase transition at T C â¼ 85 K. For a magnetic field change of 5 T, the maximum value of the magnetic entropy change (-ΔS max M) is estimated to be 4.4 J kg-1 K-1 around T C with a large relative cooling power (RCP) value of 263.5 J kg-1. While the modified Arrott plots suggested that the magnetic transition belongs to the second order phase transitions, the universal curves of the rescaled magnetic entropy (ΔS M) proved the opposite. The electrical properties of Pr0.65Ca0.25Ba0.1MnO3 have been investigated using impedance spectroscopy techniques. The dc-resistivity (σ dc) study shows the presence of semiconductor behavior. Ac-conductivity (σ ac) analysis shows that the conductivity is governed by a hopping process. From the analysis of the alternating regime, the exponent s variation obtained is in good agreement with Mott theory. The impedance spectrum analysis reveals the presence of a relaxation phenomenon. Based on these analyzes, the sample can be modeled by an electrical equivalent circuit.
ABSTRACT
Mucormycosis or zygomycosis is a group of infections caused by filamentous fungi of the mucorales order belonging to the zygomycetes family. They generally appear in patients with uncontrolled diabetes or immunodepression, especially neutropenic immunodepression. Incidence has increased with progress in immunosuppressive therapy and chemotherapy and the absence of the use of antifungal prophylactic agents effective against mucors. We report the case of a diabetic patient presenting with an excavated opacity in the right lung which failed to improve after receiving non-specific antibiotic treatment. Direct examination of the bronchial washing specimen led to the diagnosis of pulmonary mucormycosis. Prognosis depends mainly on early diagnosis, enabling appropriate treatment with amphotericin B. Mortality remains high, around 80%; diagnosis is commonly established post-mortem.
Subject(s)
Antifungal Agents/therapeutic use , Diabetes Complications/pathology , Diabetes Mellitus/pathology , Lung Diseases, Fungal/complications , Lung/pathology , Mucormycosis/complications , Adult , Bronchi/microbiology , Bronchoscopy , Diabetes Complications/diagnosis , Diabetes Complications/microbiology , Diabetes Mellitus/diagnosis , Diabetes Mellitus/microbiology , Humans , Lung Diseases, Fungal/microbiology , Lung Diseases, Fungal/pathology , Male , Mucormycosis/microbiology , Mucormycosis/pathology , Tomography, X-Ray ComputedABSTRACT
1000 patients with myocardial infarction between 1975 and june 1991 were admitted in the cardiac unit at the university hospital in Sfax. The mean age is 60 years, with a masculine predominance (86%). The time between, onset admission is long, 47.4% were admitted within 24 h after onset and 16.5% within 6 h after onset. The site of MI was more often in anterior region (58.6%) against 36% in the posterior region. Evolution was favorable in 34.7% of cases, 36.5% cases of left cardiac failure were noted, and 11.7% of cardiogenic shock rhythm disorders were noted in 34.6% of cases (under estimated) and conduction disorders were noted in 22% of cases. Early mortality is about 17.4% occurring more often during the first 3 days.