Search

The influence of dissolved cupric and ferric ions on the photocatalytic degradation of phenol in aqueous dispersions of titanium dioxide was investigated. At pH 3.5 both ion species enhanced the TiO2 photocatalytic activity until an optimum metal concentration was reached (1 × 10-3 M for Cu2+ and 7 × 10-6 M for Fe3+). Beyond these values the activity was observed to decrease, what was mainly attributed to precipitation of metal derivatives. A mechanism based in the formation of a complex between the metal and the organic compound adsorbed onto the titania surface is proposed to explain the observed positive effect of copper and iron ions addition. [ABSTRACT FROM AUTHOR]

The influence of dissolved cupric and ferric ions on the photocatalytic degradation of phenol in aqueous dispersions of titanium dioxide was investigated. At pH 3.5 both ion species enhanced the TiO2 photocatalytic activity until an optimum metal concentration was reached (1 × 10-3 M for Cu2+ and 7 × 10-6 M for Fe3+). Beyond these values the activity was observed to decrease, what was mainly attributed to precipitation of metal derivatives. A mechanism based in the formation of a complex between the metal and the organic compound adsorbed onto the titania surface is proposed to explain the observed positive effect of copper and iron ions addition. [ABSTRACT FROM AUTHOR]

A simple, rapid, and effective synthesis methodology for the preparation of high-performance TiO2 nanoparticles and thin films by combining colloidal sol-gel and microwave-assisted hydrothermal synthesis was developed. The obtained results indicate that the heating with microwaves at 180 °C for 20 min was enough to synthesize crystalline TiO2 nanoparticles, presenting anatase as a major phase with a crystal size of ~ 7 nm and a specific surface area of 220 m2 g−1. A secondary thermal treatment improved the crystallinity and induced the anatase-to-rutile transformation. The highest photocatalytic activity was found for the as-synthesized powder without any additional thermal treatment. Thin films were also prepared by dip-coating and its high photocatalytic activity showed a kinetic curve comparable to that of a thin film of commercial TiO2 powder prepared under similar conditions. [ABSTRACT FROM AUTHOR]

Background: Borderline personality disorder (BPD) is considered a disorder of emotion regulation resulting from the expression of a biologically determined emotional vulnerability (that is, heightened sensitivity to emotion, increased emotional intensity/reactivity, and a slow return to emotional baseline) combined with exposure to invalidating environments. Vagal tone has been associated with activity in cortical regions involved in emotion regulation and a lower resting state of vagal tone has been observed in BPD patients relative to healthy controls. Non-invasive transcutaneous auricular vagus nerve stimulation (taVNS) has been shown to reduce temper outbursts in adults with Prader-Willi Syndrome, to enhance recognition of emotions in healthy students, and to improve depressive and anxiety symptoms. Furthermore, a single session of taVNS has been shown to acutely alter the recognition of facial expressions of negative valence in adolescents with MDD and increase emotion recognition in controls. However, the effect of taVNS on emotional vulnerability and regulation in individuals diagnosed with BPD has not been investigated. Our aims are to determine if taVNS is effective in acutely reducing emotional vulnerability and improve emotional regulation in BPD patients., Methods: Forty-two patients will be randomized to a single session of taVNS or sham-taVNS while going through an affect induction procedure. It will consist of the presentation of one neutral and three negative affect-evoking 4-min-long videos in sequence, each of which is followed by a 4-min post-induction period during which participants will rate the quality and intensity of their current self-reported emotions (post-induction ratings) and the perceived effectiveness in managing their emotions during the video presentation. The rating of the current self-reported emotions will be repeated after every post-induction period (recovery ratings). Mixed models with individuals as random effect will be used to investigate the ratings at each stage of the study, taking into account the repeated measures of the same individuals at baseline, pre-induction, post-induction, and recovery., Discussion: The study has potential to yield new insights into the role of vagal tone in emotion dysregulation in BPD and offer preliminary data on the effectiveness of taVNS as a possible non-invasive brain stimulation to treat a core symptom of BPD., Trial Registration: ClinicalTrials.gov NCT05892900. Retrospectively registered on Jun 07, 2023., (© 2024. The Author(s).)

The coupling of membrane separation and photocatalytic oxidation has been studied for the removal of pharmaceutical pollutants. The retention properties of two different membranes (nanofiltration and reverse osmosis) were assessed. Comparable selectivity on the separation of pharmaceuticals were observed for both membranes, obtaining a permeate stream with concentrations of each pharmaceutical below 0.5 mg L(-)(1) and a rejected flux highly concentrated (in the range of 16-25 mg L(-)(1) and 18-32 mg L(-)(1) of each pharmaceutical for NF-90 and BW-30 membranes, respectively), when an initial stream of six pharmaceuticals was feeding to the membrane system (10 mg L(-)(1) of each pharmaceutical). The abatement of concentrated pharmaceuticals of the rejected stream was evaluated by means of heterogeneous photocatalytic oxidation using TiO2 and Fe2O3/SBA-15 in presence of hydrogen peroxide as photo-Fenton system. Both photocatalytic treatments showed remarkable removals of pharmaceutical compounds, achieving values between 80 and 100%. The nicotine was the most refractory pollutant of all the studied pharmaceuticals. Photo-Fenton treatment seems to be more effective than TiO2 photocatalysis, as high mineralization degree and increased nicotine removal were attested. This work can be considered an interesting approach of coupling membrane separation and heterogeneous photocatalytic technologies for the successful abatement of pharmaceutical compounds in effluents of wastewater treatment plants., (Copyright © 2013 Elsevier Ltd. All rights reserved.)

Introduction: Both Multiple Sclerosis (MS) and Neurocysticercosis (NC) are two entities in which clinical manifestations, neuroimaging findings and immunoserologic assays are neither pathognomonic nor specific requiring for their diagnosis an accurate examination of the clinical history of patients and an adequate follow up., Case Reports: Two patients who consulted non neurologists about focal neurological symptoms. Neuroimaging findings revealed multiple lesions, some of them contrast enhanced. A diagnosis of neurocysticercosis was established, supported in one of the patients by positive serologic assays for cysticerci and antihelmintic therapy began to be administered. Observing the clinical evolution of the patients, monitoring their clinical history and considering the diagnostic criteria proposed by McDonald for MS and by Del Brutto for NC the patients were finally diagnosed of MS., Conclusion: The first step to reach a diagnosis of MS is to consider such a possibility. The diagnosis is mainly based on clinical grounds and it is necessary to prove that symptoms disseminate or that alterations occur in neuroimaging findings both in time and space. It is of the utmost importance to establish a differential diagnosis with other conditions presenting with similar clinical manifestations, neuroimaging findings and cerebrospinal fluid tests results. Even with the latest criteria proposed for the diagnosis of MS and NC we may have doubts making it fundamental to cautiously interpret the clinical manifestations and tests results.

An evaluation study has been done on the quality of long-term drugs prescription. The aim was to check the effectiveness of certain corrective measures agreed by the professionals working in a primary care centre. Using the results of a first evaluation made in 1989, a series of recommendations were made to reduce the prescription of drugs with a low intrinsic value (LIV). A further evaluation took place 9 months later. A relative reduction of 20.2% in LIV drugs was obtained. This represented a reduction from 25% to 20.8% of the total number of prescriptions. In the relevant pharmacological subgroups a reduction of 77.9% in the prescription of nitrites linked to barbiturites was obtained; of 60% in LIV antacids; of 50.3% in antivaricose drugs; of 36.1% in LIV laxatives; and of 30.1% in Dipiridamol. There was no improvement in the prescription of external LIVs nor cerebral vasodilators. It is concluded that the intervention has proved its usefulness in the improvement of long-term drugs prescription.

To assess the qualitative characteristics of the prescription for chronic diseases and to select the most appropriate quality indicator, we evaluated 1588 drugs recorded in 549 forms for chronic prescription. 64.9% of the drugs were included in the Index Farmacològic, and the same rate in the Essential Drugs list of the WHO, 73.4% had a high intrinsic value (IV) and 80.7% were monocomponents. The male patients received more drugs included in the WHO list and with high IV, while patients older than age 65 years received more drugs with absent or unacceptable IV. A higher quality in the four indicators was found in the prescriptions from the CAP physicians than in those from specialists. The drug preparations with a not high IV more commonly prescribed belonged to the categories of cerebral and peripheral vascular therapy (16.2%), antacids and antiflatulents (9.3%), oral antidiabetics (8.4%), and antivaricose and antihemorrhoidal drugs (8.4%). It is concluded that the intrinsic value in the most adequate quality indicator for the prescription studies in primary care.