ABSTRACT
This study was conducted to compare the efficacy of different feed additives as mycotoxin binders in vitro. Four prevalent aflatoxin-sequestering agents (SAs) including two bentonite clays (common and acid activated bentonite), a yeast cell wall product and an activated charcoal product were evaluated in vitro to verify their capacity for binding aflatoxin B1 (AFB1). The SAs were individually mixed at two different ratios with AFB1 (1:70,000, 1:120,000) and their binding capacity indices were determined. Experimental bentonites showed high adsorption abilities, binding more than 70.00% of the available AFB1. At the 1:70,000 and 1:120,000 aflatoxin binder (AF:B) ratios, acid activated bentonite were sequestered over 87.00 and 99.00% of the AFB1, respectively. Yeast cell wall showed moderate adsorption ability at the 1:120,000 AF:B ratio, adsorbing 47.00 of AFB1. The adsorption ability of activated carbon at two AF:B ratio and yeast cell wall at 1:70,000 AF:B ratio were significantly lower than other binders. The ratio of chemisorption and binding equivalency factor were higher for acid activated bentonite compared to other sequestering agents. Based on the result of this study, it seems that acid activated bentonite could be considered efficient at sequestering the available AFB1, resulting as promising agents for use in animals diet.
ABSTRACT
INTRODUCTION: This study analyzes the role of Hardiness and optimism on negative life events and coping self-efficacy in 228 first-year undergraduate students from lorestan university (iran). The aim of the study was two-fold: (1) to analyze the associations between Hardiness, optimism, negative life events and coping self-efficacy; and (2) to determine whether Hardiness and optimism moderates the relationship between negative life events and coping self-efficacy. METHOD: This descriptive correlational study was conducted in the school year of 2016-17. In this study, at first we selected 228 students. Then the students completed the Adolescent Life Events Questionnaire (ALEQ), Revised Life Orientation Test (LOT-R), Kobasa's Hardiness Scale, and Coping Self-Efficacy Scale (CSE). Hierarchical linear regression analyses were used to examine the moderating role of Hardiness and optimism. RESULTS: Results reveal that there is a significant Relationship between Hardiness, optimism, negative life events and coping self-efficacy. Hardiness and optimism was also a moderator in the relationship between negative life events and coping self-efficacy. CONCLUSION: The findings supported the hypothesis that higher levels of Hardiness and optimism would be associated with higher levels of Coping Self-Efficacy, and that lower levels of Hardiness and optimism would be associated with lower levels of Coping Self-Efficacy. Finally, our results imply that Hardiness and optimism is an important moderator of student's negative life events on Coping Self-Efficacy
INTRODUCCIÓN: Este estudio analiza el papel de la resistencia y el optimismo en los eventos negativos de la vida y la autoeficacia de afrontamiento en 228 estudiantes universitarios de primer año de la Universidad de Lorestan (Irán). El objetivo del estudio era doble: (1) analizar las asociaciones entre resistencia, optimismo, eventos de vida negativos y autoeficacia de afrontamiento; y (2) determinar si la resistencia y el optimismo moderan la relación entre los eventos negativos de la vida y la autoeficacia de afrontamiento. MÉTODO: Este estudio correlacional descriptivo se realizó en el año escolar 2016-17. En este estudio, al principio seleccionamos 228 estudiantes. Luego, los estudiantes completaron el Cuestionario de Eventos de la Vida Adolescente (ALEQ), la Prueba de Orientación de la Vida revisada (LOT-R), la Escala de Resistencia de Kobasa y la Escala de Autoeficacia (CSE). Se utilizaron análisis jerárquicos de regresión lineal para examinar el papel moderador de la resistencia y el optimismo. RESULTADOS: Los resultados revelan que existe una relación significativa entre resistencia, optimismo, eventos vitales negativos y autoeficacia de afrontamiento. La resistencia y el optimismo también fueron moderadores en la relación entre los eventos negativos de la vida y la autoeficacia de afrontamiento. CONCLUSIÓN: Los hallazgos respaldaron la hipótesis de que niveles más altos de resistencia y optimismo se asociarían con niveles más altos de autoeficacia de afrontamiento, y que niveles más bajos de resistencia y optimismo se asociarían con niveles más bajos de autoeficacia de afrontamiento. Finalmente, nuestros resultados implican que la resistencia y el optimismo son un moderador importante de los eventos negativos de la vida del estudiante sobre la autoeficacia de afrontamiento
Subject(s)
Humans , Male , Female , Adolescent , Optimism/psychology , Life Change Events , Adaptation, Psychological , Students/psychology , Resilience, Psychological , Quality of Life , Surveys and Questionnaires , Linear Models , Self EfficacyABSTRACT
BACKGROUND: Syncope is a common clinical problem which can be remarkably debilitating and associated with high health care costs. Syncope is a clinical syndrome with many potential causes. The aim of the study was to determine the etiologies of patients with syncope in the emergency department (ED) of a referral and general university hospital. METHODS: One hundred sixty-five consecutive patients aged more than 18 years old with syncope were admitted to the emergency department of Ayatollah Rouhani Hospital. Initially organized, systematic approach included detailed medical history and structured questionnaires for history taking, physical examination, ECG and cardiac monitoring, cardiology and neurology were done. Advanced diagnostic tests were carried out if the etiology of syncope remained unexplained. RESULTS: Out of the 165 patients who presented to the ED between February 2012 and February 2013, 124 had definition of syncope. The mean age of male patients was 59.5±19.8, 58. The etiology of syncope was diagnosed in 104 (83%) patients. Neurocardiogenic syncope was found in 36 (29.03%) patients, cardiac arrhythmias in 40 (32.25%) patients, and acute coronary syndrome in 8 (6.45%) patients. There are some infrequent etiologies like intracranial hemorrhage in 5 patients, aortic stenosis in 4 patients, hypertrophic cardiomyopathy and aortic dissection in 3 patients, Brugada and pulmonary embolism in 2 patients and carotid hypersensitivity in one patient. CONCLUSION: We found that cardiac arrhythmias and neurocardiogenic type are the frequent causes of syncope. In about one-sixth of the patients, no etiology was found. Approximately one-third of patients had traumatic syncope.
