American Journal of Scientific Research and Essays

Review on the flow injection analysis (FIA)

Review article of American Journal of Scientific Research and Essays Review on the flow injection analysis (FIA) Abraha Gebregewergis Ethiopian Institute of Agricultural Research, Kulumsa Agricultural Research Center Flow injection analysis (FIA) is a simple and versatile analytical technology for automating wet chemical analysis, based on the physical and chemical manipulation of a dispersed sample zone formed from the injection of the sample into a flowing carrier stream and detection downstream. Flow injection analysis is highly efficient technique for the automated analyses of samples. Unlike the centrifugal analyzer, in which the number of samples is limited by the transfer disk’s size, FIA allows for the rapid, sequential analysis of an unlimited number of samples. FIA is one example of a continuous-flow analyzer, in which we sequentially introduce samples at regular intervals into a liquid carrier stream that transports them to the detector. The principle is similar to that of segmented flow analysis (SFA) but no air is injected into the sample or reagent streams. FIA is computer compatible and allows automated handling of sample and reagent solutions with a strict control of reaction conditions. FIA is an automated method of chemical analysis in which a sample is injected into a flowing carrier solution that mixes with reagents before reaching a detector. Unlike chromatography, however, flow injection analysis is not a separation technique. Because all components in a sample move with the carrier stream’s flow rate, it is possible to introduce a second sample before the first sample reaches the detector. As a result, flow injection analysis is ideally suited for the rapid throughput of samples. FIA is a general solution-handling technique, applicable to a variety of tasks ranging from pH or conductivity measurement to colorimetry, titrations and enzymatic assays. Keywords: Carrier; Detector; Diffusion; Dispersion; Flow injection; Versatile ...

Associated Factors to Dietary Diversity and Nutritional Status of Pregnant Women

Review article of American Journal of Scientific Research and Essays Associated Factors to Dietary Diversity and Nutritional Status of Pregnant Women. A Narrative Review Gesessew K.L. Department of Food and Nutritional Sciences, Shambu Campus, Wollega University Lack of diversified diets is a severe problem in the developing world, where diets are pre-dominantly starchy staples with few animal products, seasonal fruits and vegetables. The nutritional status of a woman during pregnancy is important as a suboptimal diet impacts negatively on the health of the mother, the foetus and the new-born. The review aimed to describe the dietary diversity and the nutritional status among pregnant women. Accord-ingly, lower dietary diversity score and undernutrition are highly considerable among women during pregnancy period. Socio- economic, morbidity and cultural factors influ-ence dietary diversity and also the nutritional status of pregnant women. It is important to promote and implement programmes aimed at improving dietary diversity and nutrition status among pregnant women in the Country. Keywords: dietary diversity, food consumption trends, nutritional status, pregnant women ...

Analysis of Solvent Effect on Formation Constants and Speciation of Cobalt(II), Copper(II) and Lead(II) Complexes of L-Methionine and Uracil

Research article of American Journal of Scientific Research and Essays Analysis of Solvent Effect on Formation Constants and Speciation of Cobalt(II), Copper(II) and Lead(II) Complexes of L-Methionine and Uracil 1Ishola, K.T.*,  2Oladipo, M.A.,3Ajayeoba, T. A. and 1Odedokun, O.A. 1 Department of Chemistry, Federal College of Education,(Special), Oyo,Oyo state,Nigeria. 2 Department of Chemistry, Ladoke Akintola University of Technology,Ogbomoso, Oyo state,Nigeria 3Department of Chemistry, Obafemi Awolowo University, Ile-ife, Osun State, Nigeria. The analysis of coordination of chelating agents to metal ions in the formation of complexes under different experimental conditions provide information on the effects of the conditions on the extent of the coordination of the ligands to the metal ions for potential applications in bioinorganic and environmental Inorganic Chemistry. The effect of solvent on the coordination of L-methionine (primary ligand) and uracil (secondary ligand) to Co(II), Cu(II) and Pb(II) ions in the formation of binary and ternary complexes have been potentiometrically investigated in water and 40% (v/v) ethanol- water media at 27 °C and ionic strength of 0.02 mol dm–3was maintained by using NaNO3. The proton-ligand stability constants and formation constants of the binary and ternary systems were established under the experimental conditions. The formation constants of the ternary complexes were numerically compared with the corresponding binary complexes in terms of Δ log K and percentage relative stabilization (%RS). Speciation of the metal ions, binary and ternary complexes as a function of pH in the solutions was investigated by using HYSS program. The ligands were observed to form more stable ternary complexes than binary complexes. The proton-ligand stability constants the ligands and the formation constants of the metal complexes were found to be higher in 40% (v/v) ethanol-water than water. The distribution of the species revealed a decrease in the metal ion concentrations with increase in the concentrations of the binary and ...


Review article of American Journal of Scientific Research and Essays BURNOUT SYNDROME AMONG MEDICAL STUDENTS: AN INTEGRATIVE REVIEW Eduardo Tomilheiro de Farias¹*; Mateus Cotias Filizola2; Wirley Matias Alves Martins Duarte3; William Barros Agrelli Girão4; Lívia Lócio Rosado de Oliveira 5; Edmundo de Oliveira Gaudêncio6 1,2,4 Estudante do Curso de Medicina da Universidade Federal de Pernambuco – UFPE; 5 Estudante do Curso de Medicina da niversidade Pernambucana de Saúde 3 Estudante do Curso de Medicina da Universidade UFCG  6Professor Associado II da Universidade Federal de Campina Grande. Introduction: Burnout Syndrome is conceptualized as a result of chronic stress in the workplace, characterized as a psychological syndrome composed of emotional exhaustion, depersonalization and reduced personal fulfillment. The prevalence of this syndrome in medical students is quite expressive, and the more the student is exposed to the academic cycle, the greater the risk of developing an anxiety disorder, especially Burnout Syndrome. Objectives: To analyze in the literature the correlation between Anxiety Disorders, Burnout Syndrome and Medical Students. Methodology: The research took place in the CAPES, PubMed and VHL Regional Portal. The terms “burnout”, “anxiety disorders” and “medical students” were considered as descriptors. Articles published between 2014 and 2019 were included. Results: Of the 69 articles found, only six were included in the review. Evidence was found that there is an association relationship between medical study and student mental exhaustion. It was also relating the time of exposure to the course with a higher prevalence of mental disorders. Relaxation techniques have shown a decline in Burnout’s cognitive and emotional stress and anxiety. Conclusion: Burnout Syndrome is a reality among medical students. However, despite the importance of the theme, the literature on this correlation is incipient. There is a need for further investigations into strategies that aim to reduce the incidence, and consequently the prevalence of ...

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