Food Safety Knowledge among Chicken Shawerma Food Handlers in Amman- Jordan

Aims: Several food poisoning outbreaks in Jordan were due to Salmonella species isolated from chicken shawerma. This study aimed to assess the food safety knowledge among chicken shawerma food handlers in Jordan.  Methods: Forty chicken shawerma restaurants in Amman were selected randomly and 120 food handlers (Egyptians 53%, Jordanians 26% and Syrians 19%) were interviewed using a structured questionnaire. Descriptive and multivariate data analysis was conducted to assess their knowledge about food safety. Results: Low overall mean score of food safety knowledge (40%); the mean percent of correct answers about transportation, receiving of chicken shawerma, storage, preparation, selling, and controlling microorganisms were: 63%, 54%, 45%, 31%, and 26%, respectively. Ninety percent of the participants had no previous training in food safety concepts.  Better food safety knowledge was significantly associated (p > 0.05) with higher educational levels, receiving special training in food safety and having a Jordanian nationality.  Conclusions: This study recommends establishing a comprehensive food safety program in Jordan to build the capacity of the food handlers and enforce periodic evaluation of their food safety knowledge and evidence-based best practices

Blood transfusion for upper gastrointestinal bleeding: Is less more again?

Background: The hemoglobin threshold for transfusion of red blood cells in patients with acute gastrointestinal (GI) bleeding is controversial. We compared the efficacy and safety of a restrictive transfusion strategy with those of a liberal transfusion strategy. Methods: Objective: The objective was to prove that the restrictive threshold for red blood cell transfusion in patients with acute upper GI bleeding (UGIB) was safer and more effective than a liberal transfusion strategy. Design: A single-center, randomized controlled trial was conducted. Setting: Patients with GI bleeding were admitted to the de la Santa Creu i Sant Pau hospital in Barcelona, Spain. Subjects: The subjects were adult intensive care unit patients admitted with high clinical suspicion of UGIB (hematomemesis, melena, or both). Patients were excluded if they had massive exsanguinating bleeding, acute coronary syndrome, symptomatic peripheral vascular disease, stroke/transient ischemic attack, transfusion within the previous 90 days, recent trauma or surgery, lower GI bleeding, or a clinical Rockall score of 0 with hemoglobin higher than 12 g/dL. Intervention: A total of 921 patients with severe acute UGIB were enrolled. Of these, 461 were randomly assigned to a restrictive strategy (transfusion when the hemoglobin level fell to below 7 g/dL) and 460 to a liberal strategy (transfusion when the hemoglobin fell to below 9 g/dL). Random assignment was stratified according to the presence or absence of liver cirrhosis. Outcomes: The primary outcome was rate of death from any cause within the first 45 days. Secondary outcomes were further bleeding, defined as hematemesis or melena with hemodynamic instability or hemoglobin decrease of 2 g/dL or more, and in-hospital complications. Results: In total, 225 patients assigned to the restrictive strategy (51%) and 65 assigned to the liberal strategy (15%) did not receive transfusions (P <0.001). The probability of survival at 6 weeks was higher in the restrictive-strategy group than in the liberal-strategy group (95% versus 91%; hazard ratio (HR) for death with restrictive strategy, 0.55; 95% confidence interval (CI) 0.33 to 0.92; P = 0.02). Further bleeding occurred in 10% of the patients in the restrictive-strategy group and in 16% of the patients in the liberal-strategy group (P = 0.01), and adverse events occurred in 40% and 48%, respectively (P = 0.02). The probability of survival was slightly higher with the restrictive strategy than with the liberal strategy in the subgroup of patients who had bleeding associated with a peptic ulcer (HR 0.70, 95% CI 0.26 to 1.25) and was significantly higher in the subgroup of patients with cirrhosis and Child-Pugh class A or B disease (HR 0.30, 95% CI 0.11 to 0.85) but not in those with cirrhosis and Child-Pugh class C disease (HR 1.04, 95% CI 0.45 to 2.37). Within the first 5 days, the portal-pressure gradient increased significantly in patients assigned to the liberal strategy (P = 0.03) but not in those assigned to the restrictive strategy. Conclusions: Compared with a liberal transfusion strategy, a restrictive strategy significantly improved outcomes in patients with acute UGIB. © 2013 licensee BioMed Central Ltd

A Simple Parameterization to Enhance the Computational Time in the Three Layer Dry Deposition Model for Smooth Surfaces

Optimization of dry deposition velocity calculation has been of great interest. Every time, determining the value of the concentration boundary layer (CBL) thickness led to a waste of numerical calculation time, which appears as a huge time in large-scale climate models. The goal of this study is to optimize the numerical calculation time in the three-layer deposition model for smooth surfaces through the development of a MATLAB code that can parameterize the appropriate concentration boundary layer height (y+cbl) and internal integral calculation intervals for each particle diameter Dp (0.01–100 µm) and friction velocity u* (0.01–100 m/s). The particle concentration, as a solution to the particle flux equation, is obtained and modeled numerically by performing the left Riemann sum using MATLAB software. On the other hand, the number of subdivisions N of the Riemann sum was also parameterized for each Dp and u* in order to lessen the numerical calculation time. From a numerical point of view, the new parameterizations were tested by several computers; about 78% on the average of the computation time was saved when compared with the original algorithm. In other words, on average, about 1.2 s/calculation was gained, which is valuable in climate models simulations when millions of dry deposition calculations are needed

A Simple Parameterization to Enhance the Computational Time in the Three Layer Dry Deposition Model for Smooth Surfaces

Optimization of dry deposition velocity calculation has been of great interest. Every time, determining the value of the concentration boundary layer (CBL) thickness led to a waste of numerical calculation time, which appears as a huge time in large-scale climate models. The goal of this study is to optimize the numerical calculation time in the three-layer deposition model for smooth surfaces through the development of a MATLAB code that can parameterize the appropriate concentration boundary layer height (y+cbl) and internal integral calculation intervals for each particle diameter Dp (0.01–100 µm) and friction velocity u* (0.01–100 m/s). The particle concentration, as a solution to the particle flux equation, is obtained and modeled numerically by performing the left Riemann sum using MATLAB software. On the other hand, the number of subdivisions N of the Riemann sum was also parameterized for each Dp and u* in order to lessen the numerical calculation time. From a numerical point of view, the new parameterizations were tested by several computers; about 78% on the average of the computation time was saved when compared with the original algorithm. In other words, on average, about 1.2 s/calculation was gained, which is valuable in climate models simulations when millions of dry deposition calculations are needed