En en el presente libro se explica cómo obtener cristales súper-planos utilizando un microscopio óptico pequeño.Las sustancias a cristalizar se pueden preparar a partir de reactivos que se encuentran en el hogar (vitamina C, por ejemplo), como tambien en laboratorios de colegios o de universidades.Las imagenes obtenidas permiten que nos planteemos la pregunta: ¿Se trata realmente de arte? Segun el renombrado artista frances Marcel Duchamp (1887-1978), los llamados "objetos encontrados" (objets trouves) si son obras de arte, ya que si de una infinidad de imagenes se elige una, se transmite una sensacion que puede ser compartida por el publico e incluso podria llegar a ser premiada por un jurado de artistas. Tal es el caso de las imagenes de los cristales y los poemas quimicos presentes en este libro: podemos decir que en ellos arte y ciencia no se pueden separar.Entre 1930 y 1960 varios investigadores dejaron cristalizar saliva, suero sanguineo o lagrimas esparcidas sobre vidrio y vieron cambios en las formas de los cristales en casos de enfermedad. No obstante, los intentos diagnosticos posteriores resultaron ser irreproducibles. Intentando entender este comportamiento, hace diez años comence a investigar y, de manera interesante, encontre que incluso leves cambios de temperatura o humedad producen cambios mayores en las formas de los cristales que aquellos provocados por enfermedades. Esto lo explico todo. Sin embargo, quede tan fascinado por las formas de los cristales que los produje y fotografie usando diversas sustancias quimicas, considerandolos como obras de arte que Dios me regala. Ahora las comparto para que los lectores de este libro puedan disfrutar con cada una de las obras obtenidas. Mario Markus

El objetivo de esta antología es mostrar qué es la química, qué investigan quienes se dedican a ella, cómo se hace y qué procesos involucra, alentando la capacidad de asombro y la curiosidad en nuestros lectores, jovenes y profesores de bachillerato. Ofrecemos aqui una seleccion enriquecida de lecturas que contribuiran a la formacion de los alumnos que cursan la materia de quimica. A las sustancias y materiales, teoria e historia de la quimica, su influencia en el medio ambiente y los avances de la bioquimica temas de nuestra primera edicion, se añaden ahora semblanzas de reconocidos quimicos como Lavoisier, Mendeleiev y Pasteur, asi como temas tan relevantes como el descubrimiento del ADN, el papel de las moleculas y las hormonas en la obesidad, las endorfinas, los enemigos de las vacunas y las drogas sinteticas, entre otros. Ademas, entrevistas con quimicos universitarios como Plinio Sosa, Ana Maria Martinez Vazquez y Agustin Lopez Munguia.

Esta edição reúne conteúdos essenciais de Ciências da Natureza, com foco em Química, Termologia e Óptica. Na parte de Química, apresenta matéria, substância e estados físicos. Em Termologia, explora

Avec ce petit manuel de maléfices pour sorciers débutants, vous plongerez au cœur d’un univers rempli de magie ! Vous apprendrez à jeter de tous nouveaux sortilèges. Et cette fois-ci, nous irons enco

Ce livre, abondamment illustré, présente 30 sujets de travaux pratiques de chimie inspirés des épreuves du concours A-BCPST sur la période 2015-2022. Ces sujets correspondent aux enseignements de chimie de CPGE, BTS, IUT, premiers cycles universitaires et cycles preparatoires aux concours denseignement. Ils repondent egalement aux exigences des programmes des filieres BCPST et PC des classes preparatoires aux grandes ecoles.A travers divers exemples en prise avec le monde du quotidien (dosage du calcium dans une coquille doeuf, extraction du limonene des peaux dorange...), differents domaines sont abordes : thermochimie, electrochimie, chimie des solutions, cinetique chimique, spectroscopie et chimie organique. Les techniques classiques de chimie generale et de chimie organique sont utilisees dans la realisation des TP.Chaque sujet correspond a trois heures dactivite experimentale et contient :- une introduction suivie de la presentation de lobjectif de lactivite,- les fiches de securite et les donnees numeriques necessaires,- lenonce du sujet qui reprend le deroule dune epreuve et fait apparaitre les appels (moments au cours desquels les etudiants proposent individuellement au professeur une solution au probleme qui leur a ete pose),- la liste du materiel et des consommables, accompagnee deventuelles annexes.Il est suivi des protocoles experimentaux ainsi que dun corrige detaille, incluantexpressions litterales, applications numeriques, courbes tracees, schemas de montageet mecanismes reactionnels. Une attention particuliere est portee a levaluation desincertitudes sur les resultats experimentaux. Les scripts Python utilises sont fournis.Les spectres (UV-visible, IR et RMN 1H) et les diagrammes presentes ont tous ete, a quelques exceptions pres, realises par les auteurs.Des tables de donnees spectrales (IR et RMN 1H), ainsi que la signification des pictogrammes, les mentions de danger (H) et les conseils de prudence (P) sont mis a disposition a la fin de louvrage.Les auteurs sont enseignants en CPGE ou en BTS, maitres de conferences ou professeurs des universites.

Cet ouvrage fait la synthèse en 200 fiches des nombreux domaines abordés en chimie générale dans les premières années d’études supérieures : thermodynamique, atomistique, cinétique des réactions, lia

Pourquoi le caoutchouc est-il élastique ? Comment s’assurer de lexistence des atomes ? Quelle est la définition d’un sucre, d’une micelle ou d’un pesticide ? Et l’entropie, c’est quoi au juste ? Pour

Cet ouvrage met en avant lintégration des outils numériques dans les travaux pratiques de chimie à des fins pédagogiques. Il s’adresse aux professeurs enseignant en classes préparatoires aux grandes

La multiplicité des produits et activités qui se côtoient dans un laboratoire de recherche ou danalyse engendre des risques spécifiques.Cette 4e édition, entièrement actualisée et rédigée par une équ

Glycals and Their Derivatives is an essential resource for understanding the emerging applications of carbohydrate-derived unsaturated sugars. Carbohydrates are versatile molecules, abundant in nature, biocompatible, and structurally diverse, with glycals and their derivatives showing remarkable biological activities, including antimicrobial and anticancer effects. It discusses the synthesis, transformations, and applications of glycals, offering valuable insights for researchers and professionals in glycoscience.Key Features:- Comprehensive Coverage: Explores the synthesis and transformation of glycals, glycosides), and 2-C-branched sugars, emphasizing their chemical and biological significance.- Advanced Synthetic Strategies: Discusses recent advances, including metal-catalyzed and metal-free approaches for glycoside synthesis under mild conditions.- Natural Product Synthesis: Highlights the total synthesis of medicinally important molecules derived from glycals.- Cutting-Edge Applications: Examines the role of glycals in creating glycohybrids and glycoconjugates, opening avenues in glycobiology and glycotechnology.Readership: Designed for undergraduate and graduate students, academic researchers, and professionals in the pharmaceutical and chemical industries.

The Mission The EC Tech Report Automation and Digitalisation provides the reader with the basic knowledge for a quick and competent introduction to the world of automation in coatings development in the laboratory, for example with high-throughput test systems and in coating production using the example of fully automated coatings production. The focus is also on increasing efficiency in time-consuming coatings development projects as well as automation in quality control and process monitoring. Thanks to digitalisation, it is possible to optimise product processes from a large amount of data, resources can be conserved, and time-saving potential can be made visible. This enables the reader to implement specific approaches for their own production, from paint research and development through to paint production, and thus utilise the latest findings in paint development. The Audience Newcomers and career changers with a background in chemistry are given a quick introduction and overview, as well as in-depth knowledge of trending subjects in the industry. It is recommended for experts who want to keep up to date with the latest trends and be prepared for future topics. The Value The reader receives a quick and reliable overview of a trend topic, compiled by the specialist editorial team of the leading trade coatings technology magazine ECJ and is based on the latest articles. In addition, readers have access to exclusive presentations from the coatings specialist. As a service for the user: there is no need for lengthy research. The reader receives concrete tips and can thus master his core task, the day-to-day formulation of coatings.

Construit pour faciliter lentraînement intensif avant les DS, les colles, les écrits ou les oraux des concours dentrée aux grandes écoles, ce livre sarticule de la façon suivante :- des rappels de co

The Mission The EC Tech Report "Marine Coatings" provides the reader with the basic knowledge of anti-fouling, which is a major issue in the marine industry, e.g. on boats and ships, to save fuel and protect against corrosion while complying with legislation. There are also the latest developments in marine coating formulations with sustainable epoxy binders, explained and presented by the leading coating (raw material) manufacturers in the form of printed papers and conference papers. Graphene is an important anti-corrosion additive for marine coatings and leading raw material suppliers will explain how to get the most out of it so that it can be successfully incorporated into own coating systems. Other papers, including sales forecasts, provide background information on how sales markets are developing globally and in different regions. Everything is presented in a very clear and handy multimedia format to provide a comprehensive overview of the most important topics in the maritime industry in a short space of time. The Audience Even for newcomers and career changers with a background in chemistry, this report is a valuable resource. It provides a clear introduction and a comprehensive overview of current trends in the industry. It is also recommended for professionals to keep abreast of the latest developments and be prepared for future topics. The Value The reader receives a quick and reliable overview of a trend topic, compiled by the specialist editorial team of the leading trade coatings technology magazine ECJ and is based on the latest articles. In addition, readers have access to exclusive presentations from the leading congress at the ECS and further relevant EC conferences. As a service for the user: there is no need for lengthy research. The reader receives concrete tips and can thus master his core task, the day-to-day formulation of coatings.

The MissionThe EC Tech Report "Outdoor Wood Coatings" provides the reader with the basic knowledge to the world of wood coatings as well as the latest developments in wood coatings formulations, explained and presented by the leading coatings (raw material) manufacturers. The articles focus on water-borne and bio-based raw materials for wood coatings to help formulators develop sustainable, environmentally friendly and therefore smaller footprint wood coatings systems. Another focus is on water-vapour permeability, showing how to interpret the measurement data obtained to develop optimum performance for wood coatings. This will enable the research team to implement concrete innovative approaches to develop their own wood coatings for outdoor use and to benefit from the latest findings in coatings development. All this in a very concise and manageable multimedia format.The AudienceThis report is also a valuable resource for new entrants and career changers with a background in chemistry. It provides a clear introduction and a comprehensive overview of current trends in the industry. It is also recommended for professionals to keep abreast of the latest developments and be prepared for future issues.The ValueThe reader receives a quick and reliable overview of a trend topic, compiled by the specialist editorial team of the leading trade coatings technology magazine ECJ and is based on the latest articles. In addition, readers have access to exclusive presentations from the leading congress at the ECS and further relevant EC conferences. As a service for the user: there is no need for lengthy research. The reader receives concrete tips and can thus master his core task, the day-to-day formulation of coatings.

Les matériaux dits ‘stratégiques’ sont ceux dont l’approvisionnement est ou risque de devenir ‘sous tension’, soit parce que les réserves mondiales s’épuisent rapidement, soit parce que la demande s’

The Mission The EC Tech Report "High-performance Polyurethanes" provides the reader with the basic knowledge to the world of polyurethanes as well as the latest developments in polyurethane coating formulations, explained and presented by the leading coating (raw material) manufacturers. The focus is on bio-based raw materials and isocyanate-free crosslinkers that make PU formulations more environmentally friendly and thus improve the footprint, currently the most important prerequisite for future-proof coating systems. This enables the research team to implement concrete innovative approaches to developing their own polyurethane coatings and to benefit from the latest findings in coating development. All this in a very concise and manageable multimedia format. The Audience Even for newcomers and career changers with a background in chemistry, this report is a valuable resource. It provides a clear introduction and a comprehensive overview of current trends in the industry. It is also recommended for professionals to keep abreast of the latest developments and be prepared for future topics. The Value The reader receives a quick and reliable overview of a trend topic, compiled by the specialist editorial team of the leading trade coatings technology magazine ECJ and is based on the latest articles. In addition, readers have access to exclusive presentations from the leading congress at the ECS and further relevant EC conferences. As a service for the user: there is no need for lengthy research. The reader receives concrete tips and can thus master his core task, the day-to-day formulation of coatings.

Description The new multi-media bundle provides a deep insight into ALTERNATIVES TO BIOCIDES in water-borne coatings with special focus on: - In-can and dry-film preservation: Basic knowledge of preservation in coatings formulations to achieve more environmentally friendly products. - Additives and Fillers: New additives or fillers increase the pH value of the coating to prevent algae growth. - Binder Technology: Making water-borne coatings resistant to microbial spoilage through new binder technologies. - Antimicrobial Coatings: Use of nanomaterials or low-temperature powder coatings to improve antimicrobial surface properties. - Plant Hygiene: Gain new impulses for process-integrated plant cleaning to reduce the use of biocides. In addition, the EC Tech Report includes exclusive market insights, important fundamentals, and an impressive package of digital bonus material.

Discover the new multimedia bundle, providing deep insights into Architectural & Decorative Coatings with special focus on the following aspects: - Emulsion binders: Learn more about the latest developments in coatings formulations. - Bio-based binders: Design the phases carefully for better results than fossil-fuel based binders. - Silicone binders: Hydrophobic silicone resin for high-performance water-borne coatings. - Additives: A green, zero-VOC, clay-based additive reduces the growth of algae, thereby thwarting coating degradation. - Digital assistant: A digital assistant for quantifying coating defects. Exclusive market insights, important fundamentals, and an impressive package of digital bonus material round off this EC Tech Report.

Avec plus de 300 exercices, 1500 questions, 120 références bibliographiques, cet ouvrage couvre en 29 chapitres tous les aspects de la synthèse chimique organique et inorganique.Ce livre contient à f

Ce volume fait le point des travaux scientifiques du chantier de restauration de la cathédrale Notre-Dame de Paris. Peu d’événements ont suscité autant d’émotions que ce grand chantier consécutif à l