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Herein, Polymethyldopamin@Fe3O4 (PMDP@Fe3O4) has been synthesized using a very simple, easy, cost-effective, efficient, and fast method. First, magnetic nanoparticles (Fe3O4) were synthesized. It was followed by accommodating polymethyldopamin (PMDP) on the prepared Fe3O4. The prepared PMDP@Fe3O4 was utilized as a sorbent in the Magnetic Solid Phase Extraction (MSPE) of six selected Polycyclic Aromatic Hydrocarbons (PAHs) including anthracene, fluoranthene, fluorene, naphthalene, phenanthrene, and pyrene. The extracted model analytes were desorbed by a Deep Eutectic Solvent (DES) and were analyzed by High-Performance Liquid Chromatography-Ultraviolet detection (HPLC-UV). The method is validated according to ICH guidelines with respect to precision, accuracy, linearity, specificity, robustness, and limits of detection and quantification. Under the optimized condition, the linearity of the method was in the range of 0.1–500 µg L−1 for the selected analytes. The calibration curves showed a determination of coefficient (r2) higher than 0.9986. The limits of detection (LODs) and limits of quantification (LOQs) were calculated to be between 0.03–0.14 and 0.09–0.46 µg L−1, respectively. The inter-day and intra-day relative standard deviations (RSDs%) were determined to be in the range of 1.7–4.2% in three concentrations. Furthermore, the enrichment factors were found to be 76, 61, 65, 78, 69, and 67 for anthracene, fluoranthene, fluorene, naphthalene, phenanthrene, and pyrene, respectively. Moreover, the calculated absolute recoveries were between 61 and 78%. The results of the real sample analysis and the obtained recoveries indicated that the method was useful and applicable in complicated real samples. PMDP@Fe3O4 nanoparticles were used for the extraction and determination of PAHs.DES was synthesized and used as a desorption solvent.The prepared sorbent showed high extraction performance, high stability, satisfactory reproducibility, and easy preparation.PMDP@Fe3O4 nanoparticles revealed satisfactory extraction recoveries for the MSPE of the PAHs.The method is effective, sensitive, cost-effective, and has wide LDRs and low LODs. PMDP@Fe3O4 nanoparticles were used for the extraction and determination of PAHs. DES was synthesized and used as a desorption solvent. The prepared sorbent showed high extraction performance, high stability, satisfactory reproducibility, and easy preparation. PMDP@Fe3O4 nanoparticles revealed satisfactory extraction recoveries for the MSPE of the PAHs. The method is effective, sensitive, cost-effective, and has wide LDRs and low LODs.

The purpose of this study was to compare organizational citizenship behavior and job creativity between male and female education personnel in Ahvaz District; the statistical population of this study included all the statistical population of all male and female education of Ahwaz District, with about 5 people. The sample of this study consists of 5 male and female educators in Ahwaz District 2, which was used to choose from class sampling and in terms of Morgan's table. The selected method of this type of research is a comparison of the post -event type. The tools used in this study were the Questionnaire of Citizen Citizenship Behavior and Randip Creativity Questionnaire. The findings showed that, given the averages of the two groups, female prost had higher organizational citizenship behavior than male nurses. Given the average temperature of the two groups, male pistols have more job creativity than female personnel.

According to experimental and clinical investigations the incubation period of the n-CoV-SARS2 ranges from 3–14 days henceforth, every case presenting for treatment should be managed as a potential asymptomatic infected patient. History regarding respiratory illness, international travel and/or, contact with COVID-19 cases should be reported in every patient sheet separately. All cases, as well as their attendants, should be monitored for COVID-19 before entering the emergency department. Any cases suspected of COVID-19 should be immediately separated while emergency management is being performed. All physicians/nurses/paramedical personnel are suggested to use surgical scrubs along with a plastic apron, face masks, and other protective instruments as necessary while in the triage unit. They should use PPE, N95 masks as well as a face visor while evaluating/intubating suspected or proven COVID-19 cases in the emergency. A dedicated operating room (OR) and the same anesthesia machine should only be applied for COVID-19 positive patients for the duration of the epidemic. The risk of aerosol dispersion is maximum during intubation, therefore it has been proposed that the whole face skin may be covered by a transparent sheet and the hands may be inserted under the sheet to intubate the cases, while the edges should be stuck to the surface. Alternatively, the application of a transparent Perspex square box has been proposed which is placed over the patient's head and has two ports for the anesthesiologist to insert his/her arm so that the whole intubation may be conducted inside the box. A preferred guideline is the application of a separate room for intubation and then bringing the case to the OR, so the risk is reduced to the surrounding health care provider.

The general aim of this study was to investigate the effect of pas-sion for physical activity on (physical) burnout in student athletes. The pre-sent study was of descriptive survey kind and based on structural equation modeling. The statistical population of this research was 350 physical edu-cation students from four state universities in Tehran. They were selected in a cluster-random way, and completed questionnaires on passion and burnout, of which 324 questionnaires were usable. The results indicated that obsessive passion with a regression coefficient of 0.23 and a T-statistics of 1.32 did not have a significant effect on the burnout of student athletes. However, the passion consistent with the regression coefficient (-0.66) and the T-statistics (-2.99) have a significant negative effect on the burnout of student athletes. Furthermore, the research model was adequately adjusted. Therefore, it is recommended that university administrators and executives implement and accelerate the planning and implementation of actions to inform students and control the negative consequences of these structures. Resumen: El objetivo general de este estudio fue investigar el efecto de la pasión por la actividad física en el agotamiento (físico) en estudiantes atletas. El presente estudio fue de tipo de encuesta descriptiva y se basó en modelos de ecuaciones estructurales. La población estadística de esta inves-tigación fue de 350 estudiantes de educación física de cuatro universidades estatales de Teherán. Se seleccionaron de forma aleatoria por grupos y se completaron cuestionarios sobre la pasión y el agotamiento, de los cuales se pudieron utilizar 324 cuestionarios. Los resultados indicaron que la pasión obsesiva con un coeficiente de regresión de 0.23 y un estadístico T de 1.32 no tuvo un efecto significativo en el agotamiento de los estudiantes atle-tas. Sin embargo, la pasión consistente con un coeficiente de regresión de (-0.66) y un estadístico T de (-2.99) tuvo un efecto negativo significativo en el agotamiento de los estudiantes atletas. Además, el modelo de investiga-ción se ajustó adecuadamente. Por lo tanto, se recomienda que los adminis-tradores y ejecutivos universitarios implementen y aceleren la planificación e implementación de acciones para informar a los estudiantes y controlar las consecuencias negativas de estas estructuras.

Additional file 1. SPIRIT 2013 CHECKLIST is recommended to address items in study protocol and related documents.