Central Venous Catheter-Related Infection in Critically Ill Patients

Letter to the Edito

Re: Leukocytoclastic Vasculitis: A peculiar presentation of scrub typhus

NON

Re: Porphyria Cutanea Tarda in a Patient with Myelofibrosis

NON

Re: Extramammary Paget disease - diagnostic and therapeutic challenges

NON

Re: Primary Plasma Cell Leukaemia: Case report and review of the literature

Letter to the Edito

"Sustainable Cellulose Nanofibers-Mediated Synthesis of Uniform Spinel Zn-Ferrites Nanocorals for High Performances in Supercapacitors"

Spinel ferrites are versatile, low-cost, and abundant metal oxides with remarkable electronic and magnetic properties, which find several applications. Among them, they have been considered part of the next generation of electrochemical energy storage materials due to their variable oxidation states, low environmental toxicity, and possible synthesis through simple green chemical processing. However, most traditional procedures lead to the formation of poorly controlled materials (in terms of size, shape, composition, and/or crystalline structure). Thus, we report herein a cellulose nanofibers-mediated green procedure to prepare controlled highly porous nanocorals comprised of spinel Zn-ferrites. Then, they presented remarkable applications as electrodes in supercapacitors, which were thoroughly and critically discussed. The spinel Zn-ferrites nanocorals supercapacitor showed a much higher maximum specific capacitance (2031.81 F g−1 at a current density of 1 A g−1) than Fe2O3 and ZnO counterparts prepared by a similar approach (189.74 and 24.39 F g−1 at a current density of 1 A g−1). Its cyclic stability was also scrutinized via galvanostatic charging/discharging and electrochemical impedance spectroscopy, indicating excellent long-term stability. In addition, we manufactured an asymmetric supercapacitor device, which offered a high energy density value of 18.1 Wh kg−1 at a power density of 2609.2 W kg−1 (at 1 A g−1 in 2.0 mol L−1 KOH electrolyte). Based on our findings, we believe that higher performances observed for spinel Zn-ferrites nanocorals could be explained by their unique crystal structure and electronic configuration based on crystal field stabilization energy, which provides an electrostatic repulsion between the d electrons and the p orbitals of the surrounding oxygen anions, creating a level of energy that determines their final supercapacitance then evidenced, which is a very interesting property that could be explored for the production of clean energy storage devices

Diagnóstico de Taquicardia Ventricular do Tipo Fascicular Através da Cardioexploraçao Eletrofisiológica Transesofágica (Cete)

Um paciente do sexo masculino, de 14 anos de idade, portador de taquicardia paroxística supraventricular (TPSV), diagnosticada 4 anos antes, refratária à terapêutica medicamentosa e associada a tonturas e síncope, foi encaminhado para avaliaçao. A cardioestimulaçao transesofágica (Cete) exerceu um importante papel na elucidaçao diagnóstica, ao induzir de forma peculiar, através de estimulaçao atrial, uma taquicardia idiopática do ventrículo esquerdo (VE). O achado da Cete foi confirmado no laboratório de eletrofisiologia, sendo realizada ablaçao percutânea por corrente de radiofreqüência na regiao médio-septal do VE, com resoluçao do circuito da taquicardia. Quatro meses do procedimento, o paciente encontrava-se assintomático e sem o uso de drogas antiarrítmicas

Diagnóstico de Taquicardia Ventricular do Tipo Fascicular Através da Cardioexploraçao Eletrofisiológica Transesofágica (Cete)

Um paciente do sexo masculino, de 14 anos de idade, portador de taquicardia paroxística supraventricular (TPSV), diagnosticada 4 anos antes, refratária à terapêutica medicamentosa e associada a tonturas e síncope, foi encaminhado para avaliaçao. A cardioestimulaçao transesofágica (Cete) exerceu um importante papel na elucidaçao diagnóstica, ao induzir de forma peculiar, através de estimulaçao atrial, uma taquicardia idiopática do ventrículo esquerdo (VE). O achado da Cete foi confirmado no laboratório de eletrofisiologia, sendo realizada ablaçao percutânea por corrente de radiofreqüência na regiao médio-septal do VE, com resoluçao do circuito da taquicardia. Quatro meses do procedimento, o paciente encontrava-se assintomático e sem o uso de drogas antiarrítmicas