Z Yousefi, A Mohseni Bandpei, R.a Dianati Tileki, R.a Mohamadpur, A Malaki, E Ghahramani,
Volume 20, Issue 1 (Suppl 2011)
Abstract
Background and purpose: Çhemical dyes used in textile industries involve some potential risks including carcinogenic and mutagenic effects in human. Furthermore, penetration of different dyes into surface and groundwater is a source of color in water reservoirs. This study aims at investigating the removal efficiency of yellow 3 and disperse yellow 3 reactive dyes by combined ÇÂÇ-SBR system.
Materials and methods: This experimental study was conducted on a batch scale and two SBR reactors were used. Wastewater samples used in this study were synthetic (ÇÔD=1800). Âfter setting up the reactors, yellow 3 and disperse yellow 3 reactive dyes were injected to the system and its removal efficiency was investigated during different reaction times. Âfter determining the SBR system efficiency in dye and ÇÔD removal, GÂÇ-SBR system efficiency was examined.
Results: During 24 hours of reactions, the efficiency of SBR and GÂÇ-SBR systems in the removal of reactive yellow3 dye was 58% and 72%, while for disperse yellow 3 it was 85 and 91%, respectively. Âlso, during 14 hours of reaction, the efficiency of SBR and GÂÇ-SBR systems for ÇÔD removal was 98 and 98.5%, respectively.
Çonclusion: The efficiency of GÂÇ-SBR system in the removal of reactive yellow 3 and disperse yellow 3 dyes was higher than that of the SBR system. However, their difference was insignificant regarding the ÇÔD removal. Ôverall, increase in the reaction time led to increase in the efficiency of systems and in a specific time of the reaction, their removal efficiency became uniform.
Seyed Hosein Montazer, Ensiyeh Taghizadeh, Seyed Mohammad Mehdi Ghaffari Hamedani, Lale Vahedi Larijani, Mohammad Khademloo, Abdollah Malakian,
Volume 31, Issue 206 (3-2022)
Abstract
Background and purpose: Appendicitis is the most common cause of acute abdominal pain requiring surgical intervention. Diagnostic tests with high accuracy could lead to immediate diagnosis and timely surgery could prevent further complications. This study was performed to assess the diagnostic value of serum fibrinogen level in diagnosis of acute appendicitis.
Materials and methods: This cross-sectional diagnostic study was performed in patients (n=165) attending the emergency department in Sari Imam Khomeini Hospital with an initial diagnosis of appendicitis and available histopathologic examination results in 2016-2017. Fibrinogen levels were measured before surgery. Student's t test, Mann-Whitney test, and Chi-square were used to examine the relationship between fibrinogen level, demographic and clinical variables, acute appendicitis, and complicated/uncomplicated appendicitis. ROC Curve test was also performed and indicators associated with diagnostic accuracy were calculated.
Results: The mean fibrinogen level in patients with normal appendices was 278.0±50.5, while it was 349.4 ± 68.7 in those with appendicitis (P<0.0001). The area under the curve was 0.794 (CI = 0.724-0.853). Moreover, at the optimal cut-point of fibrinogen level of 344 mg/dl, the sensitivity, specificity, negative predictive value, and positive predictive value were 51.7%, 90.4%, 94.4%, and 37.6%, respectively. Positive and negative likelihood ratios were 5.43 and 0.53, respectively.
Conclusion: This study showed that measuring serum fibrinogen levels, as an acute phase reactant, is useful for diagnostic screening of acute appendicitis and for predicting complicated appendicitis.
