Polystyrene-supported 1-methylimidazolium tetrachloro ferrate: Synthesis, characterization, and application as an efficient and reusable heterogeneous catalyst for one-pot synthesis of 4h-chromene derivatives in aqueous media

Polystyrene-supported 1-methylimidazolium tetrachloroferrate (PS[mim][FeCl4]) was prepared and characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The catalytic activity of the heterogeneous catalyst was evaluated through one-pot synthesis of 2-amino-4H-chromene-3-carbonitriles via the three-component condensation reaction of aromatic aldehydes, malononitrile and dimedone or 2-naphthol in water. The heterogeneous catalyst could be recovered easily and reused five times without significant loss of its catalytic activity.               KEY WORDS: Green chemistry, Heterogeneous catalyst, 4H-chromene derivatives, Multi-component reactions, One-pot synthesis Bull. Chem. Soc. Ethiop. 2018, 32(3), 531-540.DOI: https://dx.doi.org/10.4314/bcse.v32i3.1

A new method for critical path method with fuzzy processing time

Critical path method plays an important role on managing medium to large-scale problems. It is often difficult to determine the critical path for different reasons such as the existing uncertainties in processing tasks. One alternative to handle the uncertainty associated with the processing time is to use fuzzy techniques. We present a new method to calculate the critical path method when the processing times follow trapezoidal fuzzy numbers. The proposed model of this paper does not use any defuzzification technique to find the final processing time. The implementation of the proposed model is compared with other techniques using a well-known example from the literature

Successful Suicide in a Child: Depression-Related or Paroxetine-Induced?

Background: Children and adolescents are prone to develop psychiatric problems after stressful life events. These problems need appropriate treatment because of negative consequences like disease-related suicide. Antidepressants (especially "Serotonin Selective Reuptake Inhibitors") are common treatments for psychiatric problems of children and adolescents; but different side effects, including drug-induced suicide, have been reported.Case Report: In this article, we describe a nine-year-old girl who developed depression after parental divorce and was prescribed paroxetine. During pharmacotherapy, she had suicidal thoughts and several unsuccessful attempts which have been neglected and finally last attempt was successful. This report is an evidence for physicians to prescribe antidepressants cautiously with reasonable indication. As still there is no certain contraindication of using antidepressants in pediatric patients, importance of follow-ups and screening of suicide in pediatric patients during treatment with antidepressants seems essential.Conclusion: This study discloses the magnitude of explaining the side effects of antidepressants to caregivers of children with psychiatric problems

Response of armour steel plates to localised air blast load : a dimensional analysis

We report on the results of dimensional analyses on the dynamic plastic response of square armour steel plates due to detonation of proximal cylindrical charges and ensued air blast loading. By assuming a generic function for the blast load, which is multiplicative comprising its spatial and temporal parts, a set of 14 dimensionless parameters, representative of the load and plate deformation, were identified and recast in the form of dimensionless functions of stand-off to charge diameter ratio. Parametric studies were performed using commercial code ABAQUS’s module of Finite Element hydrocode using MMALE and MMAE techniques, and combined with regression analyses to quantify the dimensional parameters and the expressions for dimensionless functions. A few numerical studies with various FE mesh types were also performed to validate the transient deflections against the small-scale experiments. For pulse loading due to proximal charges of small orders of stand-off/charge diameter ratio, the magnitude of the transverse deflection increased abruptly with incremental decrease in stand-off, in contradistinction to the plate deformations at higher stand-offs where variations in displacement are smooth. This confirmed the existence of a stand-off at which a transition in behaviour takes place. For stand-off values less than charge diameter, a dimensionless energy absorbing effectiveness factor was considered to investigate the prediction of rupture in the plate corresponding to different charge masses. This factor is measured as a baseline parameter to predict, using solely numerical means, the blast loads which ensue rupture on full-scale prototypes

Delayed Onset Brain Hypoxia and Subsequent Seizures: a Rare Fatal Consequence of Undiagnosed Foreign Body Aspiration

Background: Foreign body aspiration is a common medical emergency among children that can lead to lethal complications especially in neglected or misdiagnosed cases.Case Report: This article is a report of a 15-month-old child who aspirated food materials and after chocking crisis, she presented with unspecific respiratory symptoms and treated for respiratory tract infections. After five days, sudden airway obstruction led to hypoxic brain damage and seizure. Due to unavailability of bronchoscopic facilities, extraction of foreign body was postponed and persistent hypoxia led to irreversible brain damage, seizures and finally death. This report reveals the key role of physicians in prompt diagnosis and the importance of early extraction of aspirated foreign bodies, even in asymptomatic cases, to prevent later complications and related mortality and morbidity.Conclusion: This report contains warning hints for professionals in different fields of medicine that deal with pediatric patients

Transfusion audit of blood products using the World Health Organization Basic Information Sheet in Qazvin, Islamic Republic of Iran

We assessed the practicality of using the transfusion Basic Information Sheet (BIS) for data collection, to determine the overall adequacy of physician documentation of blood product transfusion, and to make an audit of the appropriateness of blood product transfusion. The transfusion process and clinical indications for transfusions administered to adult hospitalized patients in 3 tertiary care teaching hospitals in Qazvin were prospectively reviewed. Adequate documentation was achieved in 62.6 of all transfusion episodes, range 41?73, depending on the medical specialty; 15.7 of red blood cells and whole blood requests, 40.8 of platelet requests and 34.1 of fresh frozen plasma requests were inappropriate. BIS-based information along with data collection can be used to provide feedback regarding the effectiveness of and compliance with local and national transfusion guidelines

Helicobacter pylori infection is a significant factor risk for hyperhomocysteinemia in the patients with coronary artery disease

This work aimed to determine whether seropositivity to Helicobacter pylori infection was an independent risk factor for hyperhomocysteinemia patients with cardiovascular disease. The H. pylori IgG, IgA and homocystein levels in 96 patients with cardiovascular disease and 64 participants free of cardiovascular disease as control subjects were determined by ELISA assay. The results showed that seropositivity to H. pylori IgG and IgA levels of coronary artery disease (CAD)patients was significantly higher than the controls and CAD patients with H. pylori IgG and IgA negative antibodies. A significant correlation was found between the seropositivity to H. pylori IgG and homocysteine levels of CAD patients in comparison with the controls and CAD patients with seronegativity to H. pylori IgG and IgA (r = 0.233, P = 0.019). The involvement of H. pylori infection in atherosclerosis process was based on the chronic inflammation, which might facilitate the CAD-related pathologies. The effect of the presence of H. pylori infection on homocysteine levels elevation in the CAD patients (as a risk factor independent of other traditional factors) was remarkable

Prevalence of beta lactamase producing species of pseudomonas and acinetobacter in pediatric burn patients Prevalence de pseudomonas et acinetobacter secreteurs de blse et metallo-beta lactamases chez les brules pediatriques

Burn wound infection is a major cause of morbidity and mortality in burn victims. Pseudomonas and Acinetobacter species are among the most common organisms complicating burn wounds. Presence of extended spectrum β-lactamase (ESBL) and metallo-β-lactamase (MBL) genes plays an important role in spreading β-lactam resistant strains of these organisms and is a serious condition in the treatment of the affected patients. As a result, we aimed to determine the prevalence of SHV, TEM, PER and VIM β-lactamases in Pseudomonas and Acinetobacter species isolates from burn wound swabs of children with burn injury. In this descriptive observational study, 107 Pseudomonas and Acinetobacter isolates collected from burn patients were subjected to PCR assay. Using PCR method and DNA sequencing, the existence of SHV-, TEM-, PER- and VIM-type β-lactamase encoding genes were determined. Out of the 107 Pseudomonas and Acinetobacter isolates, 66 (77.6) were ESBL positive, 26.2 were positive for SHV gene, 37.4 were positive for TEM gene, 14 were positive for PER gene and 15.9 of them harbored VIM gene. More than half of the Pseudomonas and Acinetobacter strains in our pediatric burn unit harbor β-lactamase encoding genes that make them resistant to a wide range of β-lactam antibiotics. Consequently, it is suggested to choose an appropriate antibiotic regimen based on the antibiogram pattern of the strains. © 2015, Mediterranean Club for Burns and Fire Disasters. All rights reserved

A study of frequency band structure in two-dimensional homogeneous anisotropic phononic K 3 -metamaterials

British council - Kiev under the Academic Partnership/Mobility Grant scheme grant No. UKR16EG/3/19.01.16

Dynamics of transversally vibrating non-prismatic Timoshenko cantilever beams

TurkAz Enerji Lt