scholarly journals Application of Hyphenated Techniques in Speciation Analysis of Arsenic, Antimony, and Thallium

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Rajmund Michalski ◽  
Sebastian Szopa ◽  
Magdalena Jabłońska ◽  
Aleksandra Łyko
Keyword(s):  
Speciation Analysis ◽  
Clinical Analysis ◽  
Pharmaceutical Products ◽  
Strong Impact ◽  
Hyphenated Techniques ◽  
Unique Role ◽  
Species Analysis ◽  
Control Research ◽  
The Impact

Due to the fact that metals and metalloids have a strong impact on the environment, the methods of their determination and speciation have received special attention in recent years. Arsenic, antimony, and thallium are important examples of such toxic elements. Their speciation is especially important in the environmental and biomedical fields because of their toxicity, bioavailability, and reactivity. Recently, speciation analytics has been playing a unique role in the studies of biogeochemical cycles of chemical compounds, determination of toxicity and ecotoxicity of selected elements, quality control of food products, control of medicines and pharmaceutical products, technological process control, research on the impact of technological installation on the environment, examination of occupational exposure, and clinical analysis. Conventional methods are usually labor intensive, time consuming, and susceptible to interferences. The hyphenated techniques, in which separation method is coupled with multidimensional detectors, have become useful alternatives. The main advantages of those techniques consist in extremely low detection and quantification limits, insignificant interference, influence as well as high precision and repeatability of the determinations. In view of their importance, the present work overviews and discusses different hyphenated techniques used for arsenic, antimony, and thallium species analysis, in different clinical, environmental and food matrices.

Innovations in human resources management: impact on economic growth

2021 ◽  
Vol 5 (3) ◽  
pp. 53-65
Author(s):  
Monika Danova ◽  
Ivana Kravcakova Vozarova ◽  
Elena Sira
Keyword(s):  
Economic Growth ◽  
Human Capital ◽  
Economic Performance ◽  
Human Resources Management ◽  
Precise Determination ◽  
P Value ◽  
Strong Impact ◽  
Literary Sources ◽  
The Impact

In recent years, human capital has become increasingly emphasized as a factor of economic growth. Managing human capital could stimulate the whole economy to better performance in competitiveness. Although these indicators include several variables, there is no precise determination of which indicator mostly affects the country's economic growth. This paper summarizes the knowledge and approaches of several authors in the field of economic growth, knowledge economy, competitiveness, innovations and individual elements affecting these areas. It outlines the findings and provides some insight into the impact of individual factors on economic growth across recent studies. The main goal is to obtain information about the impact of education, its support, and its influence on economic performance on the example of empirical data documenting the qualitative parameters of the workforce. The use of selected indicators indicated their impact on the change in economic performance. The partial objective is to identify an indicator or set of indicators that could express the impact of human capital on economic growth. The study involved research methods such as analyzes, statistical methods such as correlation and p-value, and prediction for the next period based on past developments. The research object is the V4 countries – the Czech Republic, Slovakia, Hungary, and Poland. The findings pointed to the strong impact of the analyzed factors on economic growth. Besides, they showed which of the known ways to increase the efficiency of the labor factor were actually or little used in the sample countries. Undoubtedly, there is also an indicative and interesting comparison within a group or with other economies at a comparable economic and social development level. Finally, improvements to the current situation were proposed. The systematization of literary sources and approaches to economic growth helps identify possible proposals for improving competitiveness in the future, using innovative approaches.

Atorvastatin: A Review of Analytical Methods for Pharmaceutical Quality Control and Monitoring

2019 ◽  
Vol 102 (3) ◽  
pp. 801-809
Author(s):  
Ana Carolina Kogawa ◽  
Ana Elisa Della Torre Pires ◽  
Hérida Regina Nunes Salgado
Keyword(s):  
Analytical Chemistry ◽  
Quality Control ◽  
Analytical Methods ◽  
Pharmaceutical Products ◽  
Point Of View ◽  
Human Consciousness ◽  
Pharmaceutical Samples ◽  
Pharmaceutical Quality ◽  
The Impact

Abstract Background: Atorvastatin, a lipid-regulating drug, was the best-selling drug in the world in the early 2000s. Thus, monitoring of this drug is important because it is accessible to a large portion of the population. In addition, its quality control is fundamental to provide quality medicines. Method of analysis can be the first step in the rational use of pharmaceuticals. Objective/Methods: In this context, a critical review of analytical methods present in the literature and official compendia for the pharmaceutical quality control of atorvastatin was made. Results: Among the analytical methods most used in the evaluation of atorvastatin, HPLC is highlighted, followed by HPLC coupled to MS, and spectrophotometry in UV. Tablets are the most studied pharmaceutical samples, and plasma is the most studied biological matrix. In the literature, studies with atorvastatin-based pharmaceutical products are more common than biological materials. Acetonitrile is the organic solvent most commonly used in the methods surveyed to evaluate atorvastatin. Conclusions: Currently, awareness of the impact that the analytical choice has on the health of the operator and the environment is growing. Therefore, the suitability of existing methods for the determination of atorvastatin can be made to adhere to the current analytical chemistry. In this way, the analytical, environmental, and human consciousness will remain united. Highlights: Although the literature shows interesting methods from an economic and environmental point of view, such as UV, Vis miniaturized, and TLC, they can still be improved to meet the requirements of the current sustainable analytical chemistry.

scholarly journals The Impact of Rural Fires on the Development of Invasive Species: Analysis of a Case Study with Acacia dealbata Link. in Casal do Rei (Seia, Portugal)

Environments ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 44
Author(s):  
Leonel J. R. Nunes ◽  
Mauro A. M. Raposo ◽  
Catarina I. R. Meireles ◽  
Carlos J. Pinto Gomes ◽  
Nuno M. C. Almeida Ribeiro
Keyword(s):  
Eucalyptus Globulus ◽  
Native Species ◽  
Satellite Images ◽  
Forest Species ◽  
Acacia Dealbata ◽  
Species Analysis ◽  
Annual Biomass ◽  
The Impact

Biological invasions can affect ecosystems in different ways. Invasive forest species, such as Acacia dealbata Link., affect forests’ productivity, because they compete directly with native species for access to light and nutrients, contributing to the loss of biodiversity. In this study, an area occupied by A. dealbata, located in Casal do Rei (Seia, Portugal) was studied to evaluate the influence of fire in the dispersion of this species, analyzing the historical occurrence of rural fires in the region, as well as through the determination of its annual biomass production and comparing its growth with other species using satellite images. The research shows a competitive advantage for A. dealbata, even when compared to species, such as Eucalyptus globulus and Pinus pinaster, which practically disappeared from the location under study after a significant fire occurred in 2005, while A. dealbata continued to thrive.

scholarly journals Neutron Star Properties: Quantifying the Effect of the Crust–Core Matching Procedure

Universe ◽  
2020 ◽  
Vol 6 (11) ◽  
pp. 220
Author(s):  
Márcio Ferreira ◽  
Constança Providência
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
Nuclear Matter ◽  
Strong Impact ◽  
The Core ◽  
Meta Modeling ◽  
Low Mass ◽  
Matching Procedure ◽  
The Impact

The impact of the equation of state (EoS) crust-core matching procedure on neutron star (NS) properties is analyzed within a meta-modeling approach. Using a Taylor expansion to parametrize the core equation of state (EoS) and the SLy4 crust EoS, we create two distinct EoS datasets employing two matching procedures. Each EoS describes cold NS matter in a β equilibrium that is thermodynamically stable and causal. It is shown that the crust-core matching procedure affects not only the crust-core transition but also the nuclear matter parameter space of the core EoS, and thus the most probable nuclear matter properties. An uncertainty of as much as 5% (8%) on the determination of low mass NS radii (tidal deformability) is attributed to the complete matching procedure, including the effect on core EoS. By restricting the analysis, imposing that the same set of core EoS is retained in both matching procedures, the uncertainty on the NS radius drops to 3.5% and below 1.5% for 1.9M⊙. Moreover, under these conditions, the crust-core matching procedure has a strong impact on the Love number k2, of almost 20% for 1.0M⊙ stars and 7% for 1.9M⊙ stars, but it shows a very small impact on the tidal deformability Λ, below 1%.

The impact of contamination from a municipal solid waste landfill (Zagreb, Croatia) on underlying soil

1998 ◽  
Vol 37 (8) ◽  
pp. 203-210 ◽  
Author(s):  
Marijan Ahel ◽  
Nevenka Mikac ◽  
Bozena Cosovic ◽  
Esad Prohic ◽  
Vesna Soukup
Keyword(s):  
Solid Waste ◽  
Microbial Transformation ◽  
Hydrological Regime ◽  
Total Content ◽  
Strong Impact ◽  
Aquifer Sediments ◽  
The Impact ◽  
The City ◽  
Underlying Soil

The present study was conducted on the main landfill of the city of Zagreb which contains about 5 million tons of waste disposed of directly onto highly permeable alluvial sediments. The investigations were aimed at assessing the impact of contamination from the landfill on underlying soil and comprised the determination of a broad spectrum of inorganic and organic constituents in the samples (size fractions <2 mm) of solid waste, soil and aquifer sediments. Both the total content of various contaminants as well as their part which is readily leachable with water were determined in the examined samples. Compound classes identified in the landfill can be classified into the two main categories: (1) markers of biological waste and of its microbial transformation (ammonia, dissolved organic carbon, short-chain aliphatic acids, phenols, derivatives of abietic acid) and (2) markers of anthropogenic waste (toxic metals, hydrocarbons, chlorinated hydrocarbons, surfactant-derived compounds, phthalates, pharmaceutical chemicals). The complex assemblages of contaminants were shown to change dramatically during the transport from the solid waste through unsaturated zone of the soil to aquifer sediments. It was shown that, in addition to the vertical infiltration of leachate from the solid waste, the hydrological regime of groundwater has also a strong impact on the contaminant distribution in soils below the landfill.

scholarly journals A Complementary and Revised View on the N-Acylation of Chitosan with Hexanoyl Chloride

Marine Drugs ◽  
2021 ◽  
Vol 19 (7) ◽  
pp. 385
Author(s):  
Berthold Reis ◽  
Niklas Gerlach ◽  
Christine Steinbach ◽  
Karina Haro Carrasco ◽  
Marina Oelmann ◽  
...  
Keyword(s):  
Potentiometric Titration ◽  
1H Nmr ◽  
Accurate Method ◽  
Strong Impact ◽  
Ph Variation ◽  
Accuracy And Precision ◽  
Low Molecular Weight Chitosan ◽  
The Impact ◽  
Reaction Media

The modification of the biobased polymer chitosan is a broad and widely studied field. Herein, an insight into the hydrophobization of low-molecular-weight chitosan by substitution of amino functionalities with hexanoyl chloride is reported. Thereby, the influence of the pH of the reaction media was investigated. Further, methods for the determination of the degree of substitution based on 1H-NMR, FTIR, and potentiometric titration were compared and discussed regarding their accuracy and precision. 1H-NMR was the most accurate method, while FTIR and the potentiometric titration, though precise and reproducible, underlie the influence of complete protonation and solubility issues. Additionally, the impact of the pH variation during the synthesis on the properties of the samples was investigated by Cd2+ sorption experiments. The adjusted pH values during the synthesis and, therefore, the obtained degrees of substitution possessed a strong impact on the adsorption properties of the final material.

Assessment of sensitivity of the efficiency of regional tax spending towards investment attractiveness of the types of economic activity carried out by the residents of advanced development territory

2020 ◽  
pp. 98-110
Author(s):  
Evgeniya Mikhailovna Popova ◽  
Guzel Mukhtarovna Guseinova ◽  
Sergei Borisovich Milov
Keyword(s):  
Economic Activity ◽  
Socioeconomic Development ◽  
Federal District ◽  
Tax Incentives ◽  
Capital Investments ◽  
The Subject ◽  
Investment Process ◽  
The Impact ◽  
Advanced Development

The deficit of subnational budgets and deceleration capital investments in multiple Russian regions increase the relevance of research aimed at improvement of tax incentivizing practice of the regional investment process. The studies focused on determination of the impact of socioeconomic and institutional factors upon the efficiency of investment tax expenses obtained wide circulation within the foreign scientific literature. The subject of this article is the assessment of sensitivity of the efficiency of regional tax expanses towards investment attractiveness of the types of economic activity carried out by the residents of territories of advanced socioeconomic development, created in the subjects of Far Easter Federal District. The scientific novelty and practical values of this research consists in substantiation of the reasonableness of assessment of investment attractiveness of the types of economic activity that are stimulated by tax incentives. Methodology for assessing investment attractiveness is proposed and tested. The conclusion is made that in case of low investment attractiveness of the type of economic activity, which was planned to support by tax incentives, it is required to conduct and additional analysis to avoid unjustified tax expanses.

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