Influence of mechanical activation and heat treatment on magnetic properties of nano structured mixture Ni <inf>85.8</inf> Fe <inf>10.6</inf> Cu <inf>2.2</inf> W <inf>1.4</inf>

© 2019, Journal of Mining and Metallurgy. Mehanicka aktivacija Ni 85.8 Fe 10.6 Cu 2.2 W 1.4 praškaste smeše, u vremenskim intervalima od 30-210 min, u kombinaciji sa termickom obradom na temperaturama u rasponu od 393-873 K, dovela je do mikro strukturnih promena, stvarajuci nanostrukturnu smešu istog sastva, ali sa poboljšanim magnetnim osobinama. Najbolji rezultat je ostvaren za mehanicku aktivaciju u trajanju od 120 min, prilikom termicke obrade na temperaturama oko Kirijeve tacke (693K), kada je specificna magnetizacija pocetne smeše povecana za 57%. Mikrostrukturne promene, koje obuhvataju strukturnu relaksaciju, smanjenje slobodne zapremine, gustine dislokacije i mikronaprezanja, dovode do poboljšanja strukturnih osobina materijala, i na taj nacin omogucuju bolju pokretljivost zidova magnetnih domena, kao i njihovo usmeravanje u primenjenom magnetnom polju, samim tim doprinose boljoj specificnoj magnetizaciji materijala. Sa dužim mlevenjem, veci stres akumuliran u uzorku podložniji je oslobadanju, pri cemu se procesi oslobadanja stresa pomeraju ka nižim temperaturama

Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation

High surface area carbon supported Pt and Pt3Sn catalysts were synthesized by microwave irradiation and investigated in the ethanol electro-oxidation reaction. The catalysts were obtained using a modified polyol method in an ethylene glycol solution and were characterized in terms of structure, morphology and composition by employing XRD, STM and EDX techniques. The diffraction peaks of Pt3Sn/C catalyst in XRD patterns are shifted to lower 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation between Pt and Sn. Particle size analysis from STM and XRD shows that Pt and Pt3Sn clusters are of a small diameter (similar to 2 nm) with a narrow size distribution. Pt3Sn/C catalyst is highly active in ethanol oxidation with the onset potential shifted for similar to 150 mV to more negative values and with similar to 2 times higher currents in comparison to Pt/C

Kawasaki-like disease and acute myocarditis in the SARS-CoV-2 pandemic – reports of three adolescents

The novel coronavirus disease (COVID-19) may induce multisystem inflammatory syndrome (MIS) in children, which may be associated with Kawasaki-like disease and cardiac injury. In this study, we presented three male adolescents with MIS and myocardial injury admitted to the hospital during the peak of COVID-19 pandemic. All of the three patients had a history of fever, gastrointestinal symptoms, polymorph rash, non-exudative  onjunctivitis, and signs of acute myocarditis (AM). One of them had renal failure. Previously, they did not have an acute infection. Upon admission, they were hypotensive and tachycardic. A nasopharyngeal swab for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on reverse transcription-polymerase chain reaction (PCR) assay was negative, but neutralizing viral antibodies were positive. In combination with blood tests,  lectrocardiogram, echocardiography, and computerized tomography, a MIS associated with acute myocarditis with mild to moderate systolic dysfunction and dilated coronary arteries were diagnosed. Two of three patients had shock syndrome andrequired inotropic support. All patients were treated with intravenous imunoglobulins (Ig). The second patient had a fever up to 102.2°F (39°C) 3 days after intravenous Ig. Further, he was treated according to protocols for refractory Kawasaki disease, with an intravenous methylprednisolone pulse therapy and aspirin. After a few hours, he became afebrile and the clinical signs disappeared. The favorable short-term outcome may reflect early recognition and adequate therapy; however, the long-term outcomes are currently unknown

Serological status of childbearing-aged women for Toxoplasma gondii and cytomegalovirus in northern Kosovo and Metohija

Abstract INTRODUCTION: Toxoplasma gondii and cytomegalovirus (CMV) are pathogens associated with congenital anomalies. METHODS: Serum was collected from 79 reproductive-age women and tested for IgM and IgG antibodies to T. gondii and CMV. RESULTS: Seropositivity for T. gondii was detected in 24.1% of women and CMV in 96.2%. High seropositivity for CMV was found for all ages. The highest seropositivity for T. gondii was observed among older participants. CONCLUSIONS: T. gondii remains an important pathogen owing to low seropositivity

Protective Effect of Hyperprolactinemia on Oxidative Stress in Patients with Psychotic Disorder on Atypical Antipsychotics Risperidone and Paliperidone: A Cross-Sectional Study

Several studies indicate the impact of antipsychotics like risperidone and paliperidone on oxidative stress parameters, yet data remain inconsistent. We investigated the link between these medications, hyperprolactinemia (HPRL), and oxidative stress. This study was conducted at the Psychiatry Clinic, University Clinical Center, Kragujevac, between November 2022 and August 2023. Inclusion criteria comprised diagnosed psychotic disorders from the ICD-10-based F20-F29 spectrum and clinical stability on risperidone/paliperidone for ≥12 weeks with no recent dose adjustments. Exclusion criteria included pregnancy, breastfeeding, relevant medical conditions, or co-therapy with prolactin-secreting drugs. Data encompassed drug choice, administration method, therapy duration, and daily dose. Prolactin (PRL) levels, oxidative stress parameters (TBARS, H2O2, O2−, NO2−), and antioxidant system (CAT, GSH, SOD) were assessed. Of 155 subjects, women exhibited significantly higher PRL levels (p p p 2− (p 2− (p = 0.002), CAT (p = 0.04), and GSH (p 2− levels were affected by drug dose (p = 0.038). TBARS (p 2− (p p = 0.022) inversely correlated with PRL levels, suggesting PRL’s protective role against oxidative stress. The female sex association with higher PRL levels implies additional factors influencing PRL’s antioxidant role. Antipsychotic choice and dosage impact PRL and oxidative stress markers, necessitating further exploration