Immobilization of silver-loaded graphene oxide (Ag-GO) on canvas fabric support for catalytic conversion of 4 nitrophenol.

Due to the rising human population and industrialization, harmful chemical compounds such as 4-nitrophenol (4-NP) and various dyes are increasingly released into the environment, resulting in water pollution. It is essential to convert these harmful chemicals into harmless compounds to mitigate this pollution. This research focuses on synthesizing a novel heterogeneous catalyst using modified canvas fabric (CF) decorated with silver metal nanoparticles on graphene oxide nanosheets (Ag-GO/CF). The process involves coating the fabrics (CF) with graphene oxide (GO) nanosheets through sonication. Subsequently, silver nanoparticles are deposited in situ and reduced on the GO surface, resulting in the formation of the Ag-GO/CF composite. Various physicochemical characterizations were conducted to examine the interfacial interactions between CF, GO, and Ag nanoparticles. The catalytic activity of the nanocomposite was assessed by hydrogenating 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of sodium borohydride (NaBH4). The results showed that the 10%Ag-5%GO/CF with a surface of 6 cm2 (3 × 2 cm) exhibited the highest catalytic activity, achieving a reduction efficiency of over 96% in 5 min. The 4-NP reduction reaction rate was well-fitted with a pseudo-first-order kinetics model with an apparent reaction rate constant (Kapp) of 0.676 min-1. Furthermore, the Ag-GO/CF composite demonstrated remarkable stability over successive cycles, with no noticeable decrease in its catalytic activity, suggesting its promising application for long-term chemical catalytic processes. This synthesized composite can be easily added to and removed from the reaction solution while maintaining high catalytic performance in the reduction of 4-NP, and it could be beneficial in avoiding problems related to powder separation.

Incorporation of g-C3N4 nanosheets and CuO nanoparticles on polyester fabric for the dip-catalytic reduction of 4 nitrophenol.

In the present work, we present the preparation of a new emerged heterogeneous catalyst (PE/g-C3N4/CuO) by in situ deposition of copper oxide nanoparticles (CuO) over the graphitic carbon nitride (g-C3N4) as the active catalyst and polyester (PE) fabric as the inert support. The synthesized sample (PE/g-C3N4/CuO) "dip catalyst" was studied by using various analytical techniques (Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy and dispersive X-ray spectroscopy (SEM/EDX), and transmission electron microscopy (TEM). The nanocomposite is utilized as heterogeneous catalysts for the 4-nitrophenol reduction in the presence of NaBH4, in aqueous solutions. According to experimental results, PE/g-C3N4/CuO with a surface of 6 cm2 (3 cm × 2 cm) demonstrated the catalyst exhibit excellent catalytic activity with 95% reduction efficiency for only 4 min of reaction and an apparent reaction rate constant (Kapp) of 0.8027 min-1. Further evidence that this catalyst based on prepared PE support can be a good contender for long-lasting chemical catalysis comes from the remarkable stability after 10 repetitions reaction cycles without a noticeably loss in catalytic activity. The novelty of this work consists to fabricate of catalyst based of CuO nanoparticles stabilized with g-C3N4 on the surface of an inert substrate PE, which results in an heterogenous dip-catalyst that can be easily introduced and isolated from the reaction solution with good retention of high catalytic performance in the reduction of 4-nitrophenol.

Predictive factors of nebulized morphine failure in North-African patients with chest trauma: a prospective pilot study.

OBJECTIVE: To determine the predictive factors of nebulized morphine (nMOR) failure in patients with chest trauma. RESEARCH DESIGN AND METHODS: This was an interventional clinical study. Patients admitted with isolated chest trauma with a pain visual analog score > 4 were included. Each patient received 10 mg nMOR. If pain was still > 4 after 10 minutes of nebulization, the latter was repeated every 10 minutes until pain was relieved (i.e. ≤ 4). If pain was > 4 at 30 minutes, nMOR was considered a failure. Patients were divided into two groups: MOR (+) and MOR (-) (good response to and nMOR failure, respectively). RESULTS: Seventy-five patients were included. Analysis of the risk factors revealed that road traffic accidents (relative risk (RR): 0.117 [0.031-0.443]; p = 0.002), number of fractured ribs > 4 (RR: 0.317 [0.092-0.543]; p = 0.006), bilateral injury (RR: 0.114 [0.037-0.349]; p < 0.001), flail chest (RR: 0.120 [0.037-0.386]; p < 0.001), hemothorax (RR: 0.203 [0.062-0.660]; p = 0.008), pulmonary contusion (RR: 0.202 [0.069-0.589]; p = 0.003), and pain at admission > 7 (RR: 0.363 [0.147-0.579]; p = 0.004) were predictors of nMOR failure. CONCLUSION: Our results can help optimize the analgesic management of chest trauma patients by identifying the most eligible patients to benefit from nMOR. CLINICAL TRIAL REGISTRATION: www.clinicaltrials.gov identifier is NCT03580187.

[Implementation of a quality management system in a central sterilization unit: experience in the Hospital Tahar Sfar, Mahdia, Tunisia]. / Mise en place d´un système de management de la qualité dans une unité de stérilisation centralisée: expérience de l´Hôpital Tahar Sfar de Mahdia en Tunisie.

In Tunisia, Hospital sterilization guidelines recommend the establishment of a quality assurance system. The purpose of this study is to give an overview of the situation in a sterilization unit in order to assess the adherence to good practice criteria and to identify opportunities for improvement. We conducted a prospective study in the sterilization unit of the Hospital Tahar Sfar, Mahdia in 2019. Two internal audits were conducted under the same conditions and were carried out one year apart. The first audit identified failures and malfunctions and the outlining of an action plan. The impact of the measures undertaken was tested using a second audit. Data collection was carried out by direct observation of the existing resources and practices. Compliance rate was calculated taking into account compliant criteria and applicable criteria. The results of the first audit revealed a compliance rate of around 28.1%. The analysis used to observe deviations made it possible to identify 5 axes of improvement, in particular the implementation of a system of documentation and a quality management system. In total, we prepared 14 documents related to the managerial processes, 26 to the operational processes and 41 to the support processes. The actions put in place enabled to achieve a compliance rate of 60.4%. The approach taken to upgrade sterilization processes made it possible to standardize them while ensuring traceability.

Refeeding syndrome after radical cystoprostatectomy: A case report.

Described as a potentially lethal condition that occurs in undernourished patients, refeeding syndrome (RFD) is a severe electrolyte disturbance that includes low intracellular serum concentrations of phosphor, magnesium and potassium in patients undergoing inappropriate oral or parenteral renutrition. We report a case of RFD in a 50-year-old male patient that occurs 22 days after a radical cystoprostatectomy. The patient was anorexic after the surgery, the body mass index decreased to 12,36 kg/m2. The concentrations of albumin, magnesium, phosphor, and calcium were low. The Patient was admitted into the intensive care unit for severe cachexia and poor general condition 24 after introduction of parenteral nutrition (1500 Kcal/day). The evolution was lethal with multiple organ failure.

Epidemiological situation of enterobacteriaceae resistant to cephalosporins third generation in the region of Mahdia, Tunisia (2002-2014).

OBJECTIVES: To determine the prevalence and to monitor the trends of resistance to broad-spectrum cephalosporins among various species of enterobacteria in the region of Mahdia (Tunisia) from 2002 to 2014. METHODS: A retrospective study was carried out in the microbiology laboratory at Tahar Sfar Teaching Hospital in Mahdia. Data concerning a thirteen-year period (2002-2014). All clinical isolates of enterobacteriaceae were identified with the API 20 E system. Antimicrobial susceptibilities were determined by disk diffusion on Mueller Hinton agar according to CA-SFM recommendations. RESULTS: During the study period, 25040 non-duplicate clinical strains of enterobacteriacae were identified. 2584 (10,3%) clinical isolates showed acquired resistance to third generation cephalosporins (3rdGC). The overall frequency of resistance increased from 8% in 2002 to 16,3% in 2014. This increase was statistically significant. High prevalence rates of 3rdGC resistance have been observed in pediatric (25,1%), in gynecologyobstetrics (21,9%) and medecine (17,4%). E. coli (21,6%), K. pneumoniae (28,6%) and E. cloacae (30,5%) showed high prevalence rates of broad-spectrum cephalosporin resistance. CONCLUSION: The resistance rates ERC3G in our region seems to be increasing. Implementation of infection control measures and identification of the mechanism responsible for third generation cephalosporins resistance are necessary to limit the spreading of these resistant enterobacteriaceae in hospitals and community settings.

Blunt chest trauma : clinical difficulties and limitations of radiological examinations.

Blunt chest trauma remains a public health problem due to the severity of caused injuries, diagnostic difficulties and therapeutic orientation. There is no correlation between the parietal lesions and endothoracic abnormalities. Instead radiological examinations are far from accurate. Through a study of 72 cases of closed chest trauma and a literature review we propose to identify risk factors of endothoracic lesions, to clarify the role of radiological examinations in the exploration of these injuries and propose a decisional algorithm.

[Primary hyperoxaluria: A review]. / Hyperoxalurie primitive : une revue de la littérature.

Primary hyperoxalurias (PH) are inborn errors in the metabolism of glyoxalate and oxalate with recessive autosomal transmission. As a result, an increased endogenous production of oxalate leads to exessive urinary oxalate excretion. PH type 1, the most common form, is due to a deficiency of the peroxisomal enzyme alanine: Glyoxylate aminotransferase (AGT) in the liver. PH type 2 is due to the deficiency of the glyoxylate reductase/hydroxypyruvate réductase, present in the cytosol of hepatocytes and leucocytes. PH type 3 is linked to the gene HOGA1, encoding a mitochondrial enzyme, the 4-hydroxy-2-oxo-glutarate aldolase. Recurrent urolithiaisis and nephrocalcinosis are the markers of the disease. As a result, a progressive dysfunction of the kidneys is commonly observed. At the stage of severe chronic kidney disease, plasma oxalate increase leads to a systemic oxalosis. Diagnostic is often delayed and it based on stone analysis, cristalluria, oxaluria determination and DNA analysis. Early initiation of conservative treatment including high fluid intake and long-term co-administration of inhibitors of calcium oxalate crystallization and pyridoxine, could efficiently prevent end stage renal disease. In end stage renal failure, a combined liver-kidney transplantation corrects the enzyme defect.

[Lichtenstein versus Lichtenstein plus plug in prosthetic inguinal hernia repair: preliminary results of a prospective randomized controlled trial]. / Lichtenstein versus Lichtenstein plus pluf dans les cures prothétique des hernies inguinales: résultats préliminaires d'une étude contrôlée prospective randomisée.

BACKGROUND: Mesh- based hernioplasties became the reference in inguinal hernia repair. AIM: To evaluate the results of combining a conic Plug to the Lichtenstein Mesh for inguinal hernia repair. METHODS: Between January 2007 and January 2009 we included 50 patients with primary or recurrent inguinal hernia in a prospective comparative randomized controlled trial. The randomization concerned the association of the conic Plug to the Lichtenstein Mesh. The primary objectives were to establish if any differences in operation time, postoperative pain response and/or postoperative recovery time, chronic pain and recurrence could be detected between the 2 groups. All patients were seen and data were collected after 2 weeks, 6 months and 2 years. RESULTS: Twenty two patients were treated by Lichtenstein Mesh (group A) and we associated the conic Plug to 28 patients (group B). The mean age was 56 years. Forty three patients were discharged after 24 hours. The postoperative pain was low with visual analogue scores ≤ 5 for 48 patients. One patient had residual pain treated efficiency with medical treatment. No recurrence in the 2 groups in 2 years outcome. There were no significant differences between the 2 groups. CONCLUSION: Results of the Lichtenstein plus Plug technique are similar to the Lichtenstein results. There were no significant differences between the 2 groups concerning early or late complications. The recurrence will be revaluated after 5 and 10 years outcome.