: Undergraduate; Organic chemistry; Hydrogen bonds; H-bridges; O-H donor groups; Misconceptions. ... Introduction In a previous paper, we described the important interactions in general chemistry between hydrogen-bridged (or hydrogen-bonded) acceptors (HBA) and hydrogen- bridged donors (HBD) using chemical
demand for more powerful psychotropic effects, are some of the factors that contribute to the increase in a more varied supply, as well as the number of drug users.The development of reliable analytical ... /chemosensors10090363. [ Links ] [61] N. R. Stradiotto, H. Yamanaka, and M. V. B. Zanoni, "Electrochemical sensors: A powerful tool in analytical chemistry," J Braz Chem Soc, vol. 14, no. 2, pp. 159-173, 2003, DOI
geothermometer is the most suitable for estimating the reservoir temperature wich are in the range between (75 - 83) °C. The analytical results were validated by recovery tests with reference material on the ... energy in food and agriculture. Opportunities for developing countries,» (En línea). Available: FAO. [ Links ] (8) M. Battistel , S. Hurwitz, W. Evans y M. Barbieri, «The chemistry and isotopic
World Bank, the United Nations, the International Organization for Migration, the Organization for Economic Co-operation and Development, along with analytical and statistical information. The research
constitute a part of the prey of the Prionostemma-species herein investigated. This is the first report on the scent gland chemistry of the sclerosomatid subfamily Gagrellinae as well as on a possible ... Graz, Graz, Austria logical chemosystematic picture of harvestmen chemistry that reflects the evolutionary history of secretion chemistry from ancient harvestmen over million years of diversification to
quantitative analytical method for HCT using liquid chromatography tandem mass spectrometry. We measured HCT in 1808 serum samples from pregnant women from the general population in Sweden (1997–2015) and in 632 ... samples. MATERIAL AND METHODS Quantitative analysis of HCT in serum Samples were analyzed at the Department of Occupational and Environmental Medicine, Lund University, Sweden. The analytical method was
-analytical response. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 20(2), 1-37. Practice is a key element in the process of acquiring motor skills, because it facilitates learning. This ... skills, using a meta-analytical approach and the analysis of possible moderating variables. The random effect model was used to calculate the extent of the effect (TE). A total 24 studies were included
Based on IUPAC recommendations for the definition of the hydrogen bond, a series of grids is presented to provide instructors of introductory chemistry courses with visual examples of H-bridged ... . The grids show the interactions among various groups and sort the interactions into types, based on their significance in general chemistry. Examples are organized by second-row elements, third-row
the world and addresses the state of these ECs in trans-American waters.Keywords : America; analytical chemistry; drinking water; environmental risks; health risks; sewage water.. ... the control of water quality and sanitation as well as important infrastructure for research in analytical chemistry and engineering, among others, most of Latin America and the Caribbean lack policies
to define the level of chemical risk present in General Chemistry experimental practices developed at university centers, by applying an inherent safety risk index. The risks of the chemicals were ... formación (ΔHf J/g) de cada reactivo a partir del libro''Handbook of Chemistry and Physics'' (19) y del archivo de''Datos Termodinámicos'' de Borgogno (20), posteriormente se aplicó la siguiente ecuación para
The objective of this project was to reconfigure the chemistry laboratory of the Caribbean campus of the University of Costa Rica as a university educational space in order to study the different
This research analyzes the perspective of chemistry teachers regarding the transition into a 100% online teaching model, which was implemented as an adaptation to the emergency caused by COVID-19 ... the methodological change in teaching. Keywords Teacher Perception; Online Teaching; Pedagogical Adaptation; Pedagogical Dissatisfaction; Chemistry; COVID-19 Introducción En el mes de
governing groundwater quality in the four studied aquifers, whereas cation exchange, interaquifer leakage, and anthropogenic processes might modify the groundwater chemistry. ... the predominant minerals, water–rock interactions directly influence the geochemical evolution of groundwater, while other natural processes might modify its chemistry. The saturation of dissolved
socioeconomic characteristics. A review was made using the SALSA (Search, Appraisal, Synthesis, and Analysis) analytical framework, finding 61 articles, 150 assessments, and 49 indicators and cataloging them
socioeconomic characteristics. A review was made using the SALSA (Search, Appraisal, Synthesis, and Analysis) analytical framework, finding 61 articles, 150 assessments, and 49 indicators and cataloging them
socioeconomic characteristics. A review was made using the SALSA (Search, Appraisal, Synthesis, and Analysis) analytical framework, finding 61 articles, 150 assessments, and 49 indicators and cataloging them
HIV infection in 2018 [ 5 ]. The main objective of the study was to describe the clinical, analytical, and psychosocial characteristics of new diagnoses of MTCT in 2018 in the PLANTAIDS Network of the ... year) and the clinical and immunological progress of patients. Methods Design Retrospective, multicenter, analytical, and descriptive study on the 3-year follow-up of patients diagnosed with HIV
rainwater at the Irazú Volcano, in 2019. Initially, Analytical performance parameters were evaluated: linearity, repeatability, intermediate precision, limit of detection and quantification in the method used ... specific points in the area, then the samples were analyzed in the Laboratory of Atmospheric Chemistry (LAQAT), where the concentration of the anions in water was determined by means of ion chromatography
and methods: The study is of a descriptive, analytical and spatial type with a cross-sectional quantitative approach, which presents the incidence and mortality -crude and adjusted by sex- according to
tests are carried out in places with all the necessary equipment and personnel with sufficient experience to carry them out. There are many factors that can influence the quality of these analytical ... ”, Current pharmaceutical design, 12, 3071-81, 2006. [ Links ] (4) United States Pharmacopeia, Design and analysis of biological Assays (111), pp 108-120; (1010) Analytical Data-Interpretation and treatment
