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Encarnación Jurado,Otilia Herrera-Márquez,Antonio Plaza-Quevedo,José M. Vicaria 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This work analyses the cleaning of starch retained on stainless-steel fibres using the experimental BSFdevice that simulates the behaviour of a CIP washing system. In the formulations used for the cleaning,silica microparticles are included and the effectiveness of the cleaning is assessed by analysing differentvariables: pH, flow rate, concentration of microparticles, and different surfactants (alkylpolyglucosidesand ethoxylated fatty alcohols). When silica particles were added to the cleaning solutions of non-ionicsurfactants, the detersive capacity of the surfactants was affected. This effect appears to be due to theinteractions between the silica particles and the surfactants used.
Selmouni, Farida,Sauvaget, Catherine,Zidouh, Ahmed,Plaza, Consuelo Alvarez,Muwonge, Richard,Rhazi, Karima El,Basu, Partha,Sankaranarayanan, Rengaswamy Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.9
Background: This study documented the performance of providers of visual inspection with acetic acid (VIA) at primary health centers, assessing their compliance with the VIA skills checklist and determinants of non-compliance, and exploring their perceptions of VIA training sessions. Materials and Methods: A cross-sectional study was conducted among VIA providers in the $Mekn\grave{e}s$-Tafilalet region of Morocco. Structured observation of their performance was conducted through supervisory visits and multiple focus group discussions (FGDs). Results: Performance of all the recommended steps for effective communication was observed in a low proportion of procedures (36.4%). Midwives/nurses had higher compliance than general practitioners (GPs) (p<0.001). All recommended steps for VIA examination were performed for a high proportion of procedures (82.5%). Compliance was higher among midwives/nurses than among GPs (p<0.001) and among providers in rural areas than those in urban areas (p<0.001). For pre-VIA counselling, all recommended steps were performed for only 36.8% of procedures. For post-VIA counseling, all recommended steps were performed in a high proportion (85.5% for VIA-negative and 85.1% for VIA-positive women). Midwives/nurses had higher compliance than GPs when advising VIA-positive women (p=0.009). All infection prevention practices were followed for only 14.2% of procedures, and compliance was higher among providers in rural areas than those in urban areas (p<0.001). Most FGD participants were satisfied with the content of VIA training sessions. However, they suggested periodic refresher training and supportive supervision. Conclusions: Quality assurance of a cervical cancer screening program is a key element to ensure that the providers perform VIA correctly and confidently.
Maduri Rodolfo,Cossu Giulia,Aureli Viviana,Wüthrich Sonia Plaza,Bobinski Lukas,Duf John Michael 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.5
Study Design: This was a retrospective review of patients with compressive cervical radiculopathy treated with a minimally invasive anterior cervical foraminotomy (ACF). Purpose: This study aimed to evaluate the results and complication rates of ACF in a consecutive series of patients and to report our clinical results of ACF as a minimally invasive technique in a series of 45 consecutive patients treated for compressive cervical radiculopathy. Overview of Literature: ACF is a motion-sparing procedure and an alternative to anterior cervical discectomy and fusion (ACDF) and posterior cervical foraminotomy for direct nerve root decompression in patients with compressive cervical radiculopathy. Methods: The chart review recorded clinical and radiological features preoperatively and postoperatively and at follow-up (FU). The effect of prognostic factors was analyzed in relation to the clinical outcome. Results: Between January 2004 and October 2019, 45 patients (15 females and 30 males) with a mean age of 55.9 years (range, 28–78 years) underwent ACF for unilateral cervical radiculopathy. The global clinical outcome according to the MacNab scale was evaluated as excellent in 64.5% of patients (n=29), good in 28.9% (n=13), fair in 4.4% (n=2), and poor in 2.2% (n=1). The radiological FU was available for 73.3% (n=33). The statistical analysis revealed no influence of age, sex, operated level, and side on the clinical outcome. Only one patient (2.2%) exhibited spontaneous bone fusion at the operated level on FU after a right-sided C6–7 ACF with no clinical consequences. No patient presented with signs of delayed segmental instability. The overall reoperation rate of this series was 4.4%. Conclusions: ACF is a feasible and low-cost alternative to ACDF in selected patients with cervical radiculopathy. The use of tubular retractors in ACF may confer an added advantage that creates a safe corridor for direct cervical root decompression yet minimizing surrounding soft tissue retraction and avoiding unnecessary bone removal.
Adsorption of Graphene Oxide onto Synthetic Fibers: Experimental Conditions
E. Giménez-Martín,J. A. Moleón-Baca,A. Ontiveros-Ortega,I. Plaza 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11
Comparative studies on the adsorption capacity of two synthetic fibers, polyamide (PA 66) and polyester (PET) pre-treated with N-cetylpyridinium chloride (PET-NCPCl), towards graphene oxide (GO) have been carried out. The fiber samples were characterized by scanning electron microscopy (FE-SEM) and Raman spectroscopy. The results of adsorption isotherms, kinetics, and zeta potential determinations as a function of the GO concentration, pH, and temperature show that at a low pH of 2.5 and a high temperature of 323 K, almost 99 % of the 75 mg/l GO solution is adsorbed onto PA 66 and 70 % onto the PET-NCPCl fibers. The interaction should be first attributed to electrostatic forces, also the adsorption data exhibited a good fit to the Freundlich isotherm model and the free energy value of 10 kJ/mol was in the range of physical adsorption, which could suggest that the interaction is driven mainly by physical forces. Due to the increasing development of wastewater treatments based on the GO reactivity with metals and cationic contaminants, synthetic fibers coated with GO could be considered an adsorbent for environmental applications.