RESUMEN
In this paper, a non-enzymatic glucose sensor was developed based on a g-C3N4/NiO/CuO nanocomposite immobilized on a glassy carbon electrode (GCE). Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) were utilized for the characterization of the synthesized g-C3N4/NiO/CuO nanocomposite. The electrocatalytic activity of the nanocomposite was investigated by cyclic voltammetry, and the amperometric technique was applied for monitoring glucose. The g-C3N4/NiO/CuO/GCE exhibited better electrocatalytic performance than g-C3N4/GCE, g-C3N4/CuO/GCE and g-C3N4/NiO/GCE. Under optimized conditions, the proposed sensor offered a linearity ranging from 0.4⯵M to 8.5â¯mM with a detection limit of 0.1⯵M and a sensitivity of 362.12⯵Aâ¯mM-1â¯cm-2. The constructed sensor displayed favorable reproducibility, outstanding selectivity, and long-term performance. These results reveal that the sensor is a promising candidate for blood glucose sensing.
Asunto(s)
Técnicas Biosensibles/métodos , Glucemia/análisis , Cobre/química , Técnicas Electroquímicas/métodos , Grafito/química , Nanocompuestos/química , Níquel/química , Compuestos de Nitrógeno/química , Carbono/química , Catálisis , Espectroscopía Dieléctrica , Electrodos , Vidrio/química , Humanos , Microscopía Electrónica de Rastreo , Microscopía Electrónica de Transmisión , Nanocompuestos/ultraestructura , Oxidación-Reducción , Reproducibilidad de los Resultados , Espectrometría por Rayos X , Difracción de Rayos XRESUMEN
Cytomegalovirus infection (CMV) is a well-known consequence of immunosuppression and one of the expected pathogens in recipients of solid organs such as renal transplant recipients (RTRs). Infection by CMV in immunocompromised settings can be life-threatening since many organs are involved and affected. Skin involvement has been rarely reported. In this report, we present a highly immunosuppressed RTR with CMV infection manifested as ulcerative skin lesions on the face, along with allograft dysfunction diagnosed by biopsy of the skin and the renal allograft, in addition to the presence of viral DNA in the tissue and antigenemia, which resolved following antiviral treatment. To the best of our knowledge, this is the first report in the literature of facial skin involvement induced by CMV in an RTR. This report emphasizes the value of early biopsy in RTRs with skin lesions and highlights CMV infection as a possible etiology.
RESUMEN
In this work, we study the effect of concentration, host medium, PH and phase states on the fluorescence emission from the laser dye Rhodamine B pumped by UV laser as exited source. The polymethylmethacrylate PMMA is used as a host medium in case of solid phase samples while, ethanol and Tetrahydrofuran (THF) are used in case of a liquid one. Laser Induced Fluorescence (LIF) technique was used to study the fluorescence properties of both cases of liquid and thin film solid-state samples. In addition, the Dual Thermal Lens (DTL) technique was used to study the quantum yield of these samples. The concentrations of Rhodamine B in ethanol as solvent between 2 x 10(-2) M and 5 x 10(-6) M were studied. The maximum fluorescence emission is observed at concentration of Rhodamine B C = 3 x 10(-4) M. Comparison studies were investigated for different host medium such as ethanol, THF, PMMA in liquid phase state and PMMA in solid phase state. The measurements revealed that, the behavior of both phases state was analogous. Rhodamine B/PMMA thin film sample by ratio of 4:1 and thickness 0.12 mm was found to have the best photostability sample with a quantum yield about approximately 0.82.
Asunto(s)
Etanol/química , Fluorescencia , Colorantes Fluorescentes/química , Furanos/química , Polimetil Metacrilato/química , Rodaminas/química , Concentración de Iones de Hidrógeno , Membranas Artificiales , Teoría Cuántica , Espectrometría de Fluorescencia , Rayos UltravioletaRESUMEN
Out of 500 dairy buffaloes examined for traumatic reticulitis in two farms, 51 buffaloes (10.2 %) were diagnosed as having the syndrome in its subacute and chronic forms. Of this 51 diseased animals, 39 had idiopathic mastitis (76.5 %). This high percentage of mastitis cases associated with traumatic reticulitis is considered as being four times the incidence of primary mastitis (20 %) in cattle. It is most likely that secondary mastitis is due to the contiguous spread of bacteria from the infected focus favoured by the devitalising effect of the foreign body syndrome.