Science topics: Chemistry
Science topic

Chemistry - Science topic

Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds.
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Publications related to Chemistry (10,000)
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Las terapias nutricionales han demostrado su utilidad en diferentes escenarios clínicos y quirúrgicos y su uso no está exento de complicaciones. En el caso de la nutrición parenteral (NP) se deja de lado el efecto de filtro del hígado, al infundir las soluciones de nutrientes directamente en el torrente sanguíneo, así como el uso del tracto gastroi...
Technical Report
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Professor Niyaz Mohammad Mahmoodi had received BSc and MSc in Chemistry and PhD in Textile Engineering (Environmental Engineering). Professor Mahmoodi published 191 peer-reviewed papers (Thomson Reuters) (Google Scholar: h-index: 59). His research focuses on environmental nanotechnology for water and wastewater treatment. Professor Mahmoodi was ele...
Article
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How does chemistry scale in complexity to unerringly direct biological functions? Nass Kovacs et al. have shown that bacteriorhodopsin undergoes structural changes tantalizingly similar to the expected pathway even under excessive excitation. Is the protein structure so highly evolved that it directs all deposited energy into the designed function?
Article
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The rotation-vibration (Coriolis) coupling contribution to variationally computed rovibrational energy levels is investigated, employing triatomic AB\({}_{2}\) molecules as models. In particular, calculations are performed for H\({}_{2}\)\({}^{16}\)O, across a range of vibrational and rotational excitations, both with and without the Coriolis contr...
Article
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In celebration of International Women’s Day, on 6 March 2020 the University of Nottingham hosted its second Women in Chemistry conference. Or, as branded by a security guard at the host building, a ‘chemical ladies’ meeting’. Victoria Richards recounts the event and shares key take-顺心彩票 messages from the speakers.
Article
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The variational quantum eigensolver is one of the most promising approaches for performing chemistry simulations using noisy intermediate-scale quantum (NISQ) processors. The efficiency of this algorithm depends crucially on the ability to prepare multi-qubit trial states on the quantum processor that either include, or at least closely approximate...
Article
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During this paper, we improved the compressive strength of cementitious matrix based on ion exchanging resin (IER) at 12% and formulated by the modified novolac epoxy polymer surfactant (NEPS) at various percentages (0, 1, 2, 3, 4 and 5%). The results show that the introduction of 1% and 2% of NEPS in the cementitious matrix with 12% of IER increas...
Article
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Flavin-mediated photocatalytic oxidations are established in synthetic chemistry. In contrast, their use in reductive chemistry is rare. Deazaflavins with a much lower reduction potential are even better suited for reductive chemistry rendering also deazaflavin semiquinones as strong reductants. However, no direct evidence exists for the involvemen...
Article
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A light reflection device combined with visible light spectrophotometer was used to measure the reflectance–wavelength curves of colored stainless steel after coloring, hardening and sealing. After these processes, the coordinate in CIE 1931 color coordinate system and brightness of samples were confirmed by chromatometry method, and the effects of...
Article
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Due to the multistep proton-coupled electron transfer, it remains a huge challenge to accelerate the kinetics of oxygen evolution reaction (OER). Here, we demonstrate that perovskite-type LaCr0.5Fe0.5O3 nanoparticles can be used as highly active and stable OER electrocatalysts, where it shows a low overpotential of 390 mV at 10 mA/cm2, a small Tafe...
Article
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Science disengagement amongst school children remains a global challenge, leading to calls for more scientists to engage with the public. Here the authors discuss how a voluntary, flexible program can enhance graduate attributes in addition to addressing barriers to public engagement.
Article
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In the original publication of this article [1], the English official name of the affiliation 1 has been changed to “Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu 610072, China”.
Article
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Can organic chemistry mimic nature in efficiency and sustainability? Not yet, but recent developments in photoredox catalysis animated the synthetic chemistry field, providing greener opportunities for industry and academia.
Article
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It is the aim of this study to discuss for two-body systems like homonuclear molecules in which eigenvalues and eigenfunctions are obtained by exact solutions of the solvable models based on SU(1, 1) Lie algebras. Exact solutions of the solvable Hamiltonian regarding the relative motion in a two-body system on Lie algebras were obtained. The U(1) ?...
Article
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La administración de sustancias psicoactivas a una persona, sin su consentimiento, para doblegar su voluntad y, sin su oposición, atentar contra su libertad sexual encuentra encaje en el Código penal espa?ol como forma típica de abuso sexual y no como agresión sexual, figura delictiva que requiere siempre violencia o intimidación. La jurisprudencia...
Article
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The 2019 Nobel Prize in Chemistry has been awarded to John B. Goodenough, M. Stanley Whittingham and Akira Yoshino for their contributions in the development of lithium-ion batteries, a technology that has revolutionized our way of life. Here we look back at the milestone discoveries that have shaped the modern lithium-ion batteries for inspiration...
Article
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In continuation of our work on enzyme inhibition, the benzofuran-based-thiazoldinone analogues (1–14) were synthesized, characterized by HREI-MS, 1H and 13CNMR and evaluated for urease inhibition. Compounds 1–14 exhibited a varying degree of urease inhibitory activity with IC50 values between 1.2 ± 0.01 to 23.50 ± 0.70 μM when compared with standar...
Article
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Highlights ? Three origins of lower Cambrian cherts were recognized on the Yangtze Block. ? An OMZ-like zone dynamically occurred at shelf–slope locations during ~535–526 Ma. ? Spatial change of an OMZ-like zone regulated biological distribution and evolution.
Article
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Modelos de conocimiento didáctico del contenido científico y tecnológico en docentes de Química y Física ■ Models of Didactic Knowledge of Scientific and Technological Content in Chemistry and Physics Teachers ■ Modelos de conhecimento didático de conteúdo científico e tecnológico em professores de química e física Resumen El presente artículo desc...
Book
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A coletanea de artigos científicos Perspectiva da educa??o científica e tecnológica reúne artigos de autoria dos professores dos Cursos de Gradua??o em Licenciatura em Química, Licenciatura em Matemática e Tecnologia de Alimentos do Instituto Federal de Educa??o, Ciência e Tecnologia do Tocantins IFTO – campus Paraíso do Tocantins. Os artigos cient...
Poster
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Los residuos marinos son materiales sólidos persistentes que llegan al entorno marino o costero. Alrededor del 80% de ellos provienen de fuentes terrestres y el resto de fuentes marinas. La presencia de residuos en el entorno marino provoca alteraciones químicas en el agua como el nivel de oxígeno o luz, creando un déficit en el crecimiento y desar...
Book
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Abu Bakr Muhamad ibn Zakariyya, ( 854? - 925) conocido como Al-Razi “el hombre Ray” (antiguamente Rague) por haber nacido en esa ciudad, situada cerca de Teherán, fue un médico, docente e investigador que hizo grandes contribuciones a la Química y a la Medicina. Fue el primero en establecer que viruela y sarampión eran enfermedades diferentes, deta...
Article
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The process of the rapid origin of life on Earth is analyzed, taking into account the evolution of our Sun (the beginning of thermonuclear reactions). Given the knowledge about DNA, viruses and the structure of bacteria, it is concluded that the origin of life on Earth was initiated from the outside. Further, using space chemistry, it is shown that...
Article
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AUTOR: SHIRLEY ELINA BERMEO BAZURTO Resumen: En este trabajo se ense?a y detalla la Creatividad e Innovación en los Estudiantes Universitarios a utilizar instrumento que permitan la mejora continua del aprendizaje. El desarrollo de la capacidad creativa en los estudiantes es una de la competencia transversal al nivel mundial, en la cual tiene mucha...
Article
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En medio de la pandemia se han agudizado los extremos y se plantea con toda claridad la urgencia de darle a la comunicación el papel terapéutico necesario para que la sociedad pueda solucionar este y otros muchos retos en los que la conducta de millones es determinante. Sea el cambio climático con sus tormentas feroces o los fuegos sin control, sea...
Article
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The use of peak fitting to extract information from X-ray Photoelectron Spectroscopy (XPS) data is of growing use and importance. Due to increased instrument accessibility and reliability, the use of XPS instrumentation has significantly increased around the world. However, the increased use has not been matched by the expertise of the new users, a...
Article
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Background: To make students more interested and engaged in science, new teaching approaches have been developed aiming at higher order thinking. Context-based learning approaches emanate from an idea that science content knowledge should be presented in a relevant context for students to improve their learning outcomes as well as making them more...
Preprint
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Hoy dos investigadoras ganaron el Nobel de Química, mismo día en que la patente de uso sobre la razón por tal galardón es otorgada a un tercer investigador; con quienes estaban en disputa desde 2012. Tal razón se trata pues, no sólo de una herramienta revolucionario, sino de un mercado actualmente aún sin explotarse todas sus capacidades y proyecci...
Article
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Los alumnos experimentan un rechazo creciente hacia la Química. De acuerdo con la investigación educativa, es necesario intervenir sobre esta aversión, puesto que las emociones y valoraciones subjetivas de los alumnos hacia las actividades académicas interaccionan con la cognición, afectando a su aprendizaje. Para ello se ha propuesto implementar a...
Article
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Este programa se elaboró a partir de ideas de entrenadores cubanos y las orientaciones en las reuniones nacionales de talentos en Cuba, también se tuvo en cuenta el criterio de las metodólogas de Química provincial y municipal (Ciego de ávila) y profesores de la provincia.
Conference Paper
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In the creation of the curriculum 16, two fundamental disciplines such as Physics and Chemistry were combined into one discipline. As a result, the combined exam at the end of the first year turns out to be quite difficult and with material from both semesters. The management of the faculty expressed the wish in the next syllabus that these discipl...
Cover Page
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Preface to a Special Issue in Chemistry Africa journal titled "Editors’ Contributions to Chemistry Africa"
Conference Paper
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Q?llimi i k?tij punimi ?sht? t? analizoj? ndikimin e pandemis? Covid 19 n? veprimtarin? e p?rgjithshme gjyq?sore administrative n? Republik?n Veriore t? Maqedonis?. Duke marr? parasysh q? Covid 19 si pandemi globale me p?rmasa bot?rore po ndikon negativisht n? t? gjith? sferat jet?sore poashtu edhe n? t? gjith? funksionet dhe veprimtarit? m? t? r?...
Method
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Die zeitaufgel?ste Fluoreszenzspektroskopie ist eine geeignete Methode zur Untersuchung von Energie- und Elektronentransferprozessen. Dabei k?nnen durch die Farbverschiebung zwischen absorbierenden und emittierenden Molekülen die Wechselwirkung von Molekülen direkt sichtbar gemacht werden. Anwendung findet die zeitaufgel?ste Fluoreszenzspektroskopi...
Article
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Garlic and onion have been of medicinal value in the treatment of hypertension and they are also used by people who wanted to lose weight. This research discusses the effects of these bulbs on the entire nervous system, mechanism of action, and complications of over use. This research highlights the chemistry of the active components in these bulbs...
Article
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Resumen En este articulo damos a conocer el objetivo de la creatividad e innovación de los estudiantes universitarios para que en un futuro puedan emprender, en base a los conocimientos adquiridos. La creatividad e innovación implica la generación de ideas nuevas para el individuo y así poder organizarse y llegar a los demás con el punto de vista d...
Article
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The present Special Issue in Frontiers in Chemistry, Sections “Green and Sustainable Chemistry” and “Polymer Chemistry,” entitled “Recent trends in preparation, characterization and applications of nanocellulose” aims to further contribute to the momentum of research and development in nanocellulose, by featuring three original research papers as w...
Article
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ESCUELA DE PEDAGOGíA EN QUíMICA Y BIOLOGíA AUTOR: SOLORZANO LOOR PEDRO JHONY TEMA: CREATIVIDAD E INNOVACION ASIGNATURA: EMPRENDIMIENTO DOCENTE: RAFAEL SALTOS PERíODO: MAYO-OCTUBRE 2020 Tema: CREATIVIDAD E INNOVACIóN El siguiente artículo presenta como principal base la importancia de inculcar en los estudiantes universitarios un pensamiento creativ...
Preprint
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This review aims to draw attention to two issues of concern when we set out to make machine learning work in the chemical and materials domain, i.e., statistical loss function metrics for the validation and benchmarking of data-derived models, and the uncertainty quantification of predictions made by them. They are often overlooked or underapprecia...
Article
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The article tells about the challenges caused by Russian occupation in the beginning of XIX century Georgia, consequently, restriction of Georgian language impacted negatively on the learning process. Akaki Tsereteli expressed his pedagogical approaches in op-ed pieces("Chemi Tavgadasavali" - My Adventure and "Gamzrdeli" - Foster parent), where the...
Book
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El examen de la bioética académica en una universidad pública chilena que se presenta en este documento es una visión desde la biología y la química que se vive en la Facultad de Química y Biología de la Universidad de Santiago de Chile. Sin embargo, no es la única manera de ver y comprender a la bioética en nuestra comunidad universitaria, refleja...
Cover Page
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1st ChemPlusChem Virtual Symposium, September,22, 2020 Organized by Chemistry Europe; European Chemical Societies Publishing, Wiley VCH..
Thesis
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The cause of space voids, like galactic clusters, is the chaotic movement of galaxies. Yes, yes, precisely in the chaotic movement of galaxies in our Universe. This becomes obvious and logical when we remember of chemistry. More precisely, the Belousov-Zhabotinsky reaction...
Technical Report
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Chemical crystals grown on the surface of shells and rocks from the sea. Science and Art. The Art of Poen de Wijs. Design of chemical patterns. Chemical patterns by GeCla, Atractor. A review on Science and Art at Facebook.com
Chapter
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O broto de palma surge como uma hortali?a alternativa para o consumo humano. Desse modo, objetivou-se estudar a qualidade físico-química dos cladódios jovens da palma ‘Orelha de Elefante Mexicana’ minimamente processados. O experimento foi realizado no Laboratório de Química, Bioquímica e Análise de Alimentos do Centro de Ciências e Tecnologia Agro...
Article
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Os crimes sexuais s?o de tal modo hediondos que originam defensores da pena de morte para os ofensores sexuais. No entanto, a pena de morte foi abolida em vários países pelo mundo, sendo a pena de pris?o a alternativa viável. O tratamento de ofensores sexuais (especialmente abusadores de crian?as e pedófilos) é um tópico que tem assumido uma import...
Article
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Espa?ol: Tras introducir la relación entre filatelia y química, tratada ya por diversos autores desde hace décadas, se recogen ideas sobre la potencialidad del sello postal como herramienta para la didáctica y la divulgación de las ciencias. En concreto, se aportan detalles sobre las emisiones de sellos que, a nivel internacional, se han realizado...
Chapter
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El estudio se realizó en las instalaciones de la Cooperativa Atahualpa Jerusalén llamada Granja Porcón, ubicada en la región Cajamarca. Se tuvo como objetivos: 1) Caracterización química de la materia prima, 2) producción de briquetas y 3) la determinación del contenido energético de ambas. La briqueta se produjo a partir de los residuos forestales...
Conference Paper
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Quantentechnologien gewinnen rasant an Bedeutung und "Quantum Awareness" wird auch im In-genieurwesen immer wichtiger. Damit ergeben sich in der universit?ren Lehre neue Herausforde-rungen zur Ausbildung von "Quantum Engineers". Hier setzt das Projekt an: Es werden Kenntnisse und Kompetenzen im Bereich der Quanteninformationstechnologien identifizi...
Poster
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Poster presentation for the RSC: Early Career Researcher Meeting held online on twitter. A full paper can be downloaded from: https://iopscience.iop.org/article/10.1088/2053-1591/ab4deb/meta
Book
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Este livro contém 21 capítulos com experiências vivenciadas em escolas de ensino médio por alunos do curso de licenciatura em Química da UFCG, relacionando Ensino de Química e Educa??o Ambiental em diferentes contextos.
Poster
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Chemistry Department, Universitas Islam Indonesia proudly present the Webinar agenda" Materials for Energy and Environment" on: Day/Date : Monday/ 21st September 2020 Time : 09.00 - 12.00 WIB Speaker: 1. Prof. Dr. Ruey-aan Doong (National Tsing Hua University, Taiwan) 2. Prof. Dr. Titania Nugroho ( Universitas Riau) Remarks : Prof. Riyanto, Ph.D. D...
Article
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Rapid developments in educational technology show its impacts on classes. One of the recent trends in science education is virtual laboratory environments. The goal of this study is to reveal the effects of inquiry-based hands-on and virtual laboratory environments on pre-service science teachers' inquiry skills. A quasi-experimental research desig...
Article
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Resumo Este trabalho objetiva apresentar um produto educacional para o ensino de estereoquímica, tendo como alicerce a Teoria da Aprendizagem Significativa, denominado unidade de ensino potencialmente significativa. Considerando que o conhecimento prévio influencia fortemente a aprendizagem, utiliza-se a temática plantas medicinais devido a sua est...
Preprint
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In the field of chemistry, there have been many attempts to predict the properties of unknown compounds from statistical models constructed using machine learning. In an area where many known compounds are present (the interpolation area), an accurate model can be constructed. In contrast, data in areas where there are no known compounds (the extra...
Article
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La descarga de aguas residuales sin o con deficiente tratamiento en la cuenca del Lago de Atitlán, es una de las principales causas del deterioro del Lago (Oliva, Pérez, & Valladares, 2011). La Planta de Tratamiento de Aguas Residuales “Los Cebollales” ubicada en el municipio de Panajachel fue evaluada en su afluente y efluente, determinándose que...
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This volume brings together innovative research, new concepts, and novel developments in the application of new tools for chemistry post-graduate students and chemical. It is an immensely research-oriented, comprehensive and practical Book. Post-graduate chemistry students would benefit from reading this book as it provides a valuable insight into...
Chapter
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RESUMO: Este trabalho se refere a uma atividade prática desenvolvida com um simulador interativo, que foi realizada priorizando uma abordagem qualitativa do conceito de densidade. Segundo pesquisadores, o ensino da densidade é muito centrado em abordagens quantitativas, o que possibilita a aprendizagem da defini??o de densidade, em detrimento do co...
Book
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Libro de Resúmenes del Primer Encuentro Virtual destinado a la Caracterización de Materiales (CaracterizAR 2020). Entre el 9 y el 11 de septiembre tuvo cita el evento virtual CaracterizAR 2020, organizado por el Instituto de Química y Metabolismo del Fármaco (IQUIMEFA, CONICET-UBA). El objetivo del encuentro, que superó los 700 inscriptos, fue pone...
Article
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Resumo: As aulas experimentais surgem como uma estratégia eficiente devido ao seu caráter motivador. Em um curso preparatório para Exames e Vestibulares, destaca-se o ensino de uma gama de conteúdos em pouco tempo. Nesse contexto, este trabalho visa investigar as contribui??es e as limita??es da utiliza??o da experimenta??o em aulas de Química de u...
Conference Paper
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Palavras-Chave: Desenho Universal da Aprendizagem; Estágio Supervisionado; Micro ensino INTRODU??O O Estágio Supervisionado é uma etapa obrigatória da forma??o de professores, que tem de acordo com o Parecer CNE/CES n 15/2015 "consolidar e articular as competências desenvolvidas ao longo do curso por meio das demais atividades formativas[...]". Os...
Poster
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International Journal Of Pharmacy and Chemistry Editorial Board Membership ..
Article
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Im Oktober 2018 wurden in einer im ?sterreich durchgeführten Pilotstudie Mikroplastikpartikel im menschlichen Stuhl nachgewiesen. Ein wesentlicher Grund: Kunststoffreste aus dem Meer, ganz gleich ob Makro- oder Mikroplastik, k?nnen über Nahrungsketten wieder zu uns gelangen. Allein schon daraus ergibt sich ein Handlungsbedarf, der sich nur in einer...
Book
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A publica??o tem como objetivo subsidiar o uso e o manejo mais sustentável dos solos e ambientes do município de Cruzeiro do Sul a partir das recomenda??es de corre??o e aduba??o de culturas prioritárias fomentadas no município de Cruzeiro do sul e municípios do entorno. A obra foi dividida em 15 capítulos, quais sejam: o capítulo 1 aborda a oferta...
Article
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We perform a source attribution for tropospheric and ground-level ozone using a novel technique that accounts separately for the contributions of the two chemically distinct emitted precursors (reactive carbon and oxides of nitrogen) to the chemical production of ozone in the troposphere. By tagging anthropogenic emissions of these precursors accor...
Book
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Pullulan is a polysaccharide of economic importance and can find potential applications in food, pharmaceutical, agricultural, and several other industries. This book discusses its chemistry, processing, properties, and various applications along with its production at the laboratory level. The book summarizes in a comprehensive manner many of the...
Conference Paper
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Impulsado por las regulaciones específicas, el sector automotriz se encuentra en una transición desde los vehículos con motor de combustión interna hacia los vehículos eléctricos. Este contexto abre ventanas de oportunidad para el reposicionamiento de empresas y países. El objetivo del presente trabajo es estudiar las oportunidades que supone la tr...