Kemi

This thesis describes how the rich internal degrees of freedom of molecules can be exploited to construct the first ¿clock¿ based on ultracold molecules, rather than atoms. By holding the molecules in an optical lattice trap, the vibrational clock is engineered to have a high oscillation quality factor, facilitating the full characterization of frequency shifts affecting the clock at the hertz level. The prototypical vibrational molecular clock is shown to have a systematic fractional uncertainty at the 14th decimal place, matching the performance of the earliest optical atomic lattice clocks. As part of this effort, deeply bound strontium dimers are coherently created, and ultracold collisions of these Van der Waals molecules are studied for the first time, revealing inelastic losses at the universal rate. The thesis reports one of the most accurate measurements of a molecule¿s vibrational transition frequency to date. The molecular clock lays the groundwork for explorations into terahertz metrology, quantum chemistry, and fundamental interactions at atomic length scales.

This brief is a concise guide that explores the theory and practical aspects of improving enantioselectivity in enzymatic kinetic resolution, with a specific focus on the role of hydrolases in this process. Enzymatic kinetic resolution is a valuable technique for obtaining enantiopure compounds, and hydrolases are highlighted as a crucial class of enzymes widely used in industries for chiral synthesis involving kinetic resolution. The book emphasizes the importance of tuning and optimizing the enzymatic kinetic resolution process to achieve the highest possible enantiomeric excess in the final product or starting material while maintaining the desired yield. Through illustrative examples, the text aims to make the concept accessible and appealing to graduate students, researchers, and young organic chemists seeking to incorporate hydrolases in their stereoselective synthesis endeavors.

This book covers the challenges and opportunities presented by plastics in the modern era and sheds light on the complex interplay of technology, environment, and socio-economic dynamics. With a thorough exploration of the history, uses, and potential of plastics, the book reviews the impact of plastics beyond single-use plastics, and critiques multiple long-term plastic applications that are significant for food security, water resource management, ecological conservation/restoration, and sustainable urbanization. It also explores frameworks for achieving a more sustainable plastic economy aligned with sustainable development goals.This book comprises 13 chapters, commencing with a critical assessment of plastics in the context of sustainable development and global society. It proceeds with a historical overview of plastics' evolution, showcasing pivotal milestones and innovations in modern industry and daily life. Subsequent chapters delve into diverse topics: the intricate relationships between plastics, food security, and sustainable urbanization; plastics' impact on water safety, management, distribution, and conservation; their potential as an alternative energy source; and their innovative applications in sustainable transportation and energy generation. Emphasis is placed on plastics' role in waste reduction and recycling, as well as the latest sustainable alternatives like biodegradable and recyclable materials. In the book's final sections, readers will learn about green buildings and climate-resilient cities constructed using innovative plastic materials, and plastics' significance in space exploration. The book concludes with a forward-looking perspective on plastics' future, accompanied by recommendations for a more sustainable coexistence between society and these versatile materials.This book is a valuable resource for researchers, policymakers, industry professionals, and concerned citizens seeking to navigate the intricate landscape of plastics, their environmental implications, and their potential for sustainable development.

Recent Advances in Mineralogy includes nine chapters that discuss the mineralogy, petrology, and geochemistry of granitic rocks, mechanical properties of some granitic rocks, production of synthetic quartz, dislocation originated by X-ray irradiation in KBr crystals and mineralogy and geochemistry of bituminous rocks from North Africa. It contains detailed mineralogical, petrological, and geochemical studies from Europe, Southeast Asia, and Northern Africa.

This contributed volume provides a comprehensive understanding of synthetic protocols, characterization techniques, and current applications of iron oxide-based nanocomposite and nanoenzyme materials. It covers basic concepts and recent advancements in iron oxide-based nanocomposites and nanoenzymes, focusing on their synthesis, characterization, and functionalization for specific research applications. The different chapters in the book highlight key characterization techniques including Fourier Transform Infrared Spectroscopy, X-ray diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy, among others while it also explores various applications of these materials, such as adsorption of heavy metals and dyes, gas sensors, biomedical applications, photo-catalysis, and photovoltaic sensors. This book serves as a valuable resource for researchers and graduate students working in the fields of materials science, chemistry, physics, and biotechnology.

This Special Issue reprint highlights seventy years since the discovery of carbon nanotubes (CNTs) in 1952 by Russian scientists LV Radushkevich and VM Lukyanovich in what was then the Union of Soviet Socialist Republics or the USSR. It also reflects the popularization by the well-known Japanese scientist S Iijima, since 1991, of carbon nanostructures, including CNTs, towards nanotechnology as a forever impactful and inspiring field. For researchers, academics, and teachers of all levels, from novice to expert to guru, the articles contained within this Special Issue are themed around sustainability from nanotechnology, pertaining to diameter measurement, rotor system molecular simulation, ultra-high tensile strength, energy, filtration via membrane distillation, environmental remediation using adsorption, ionic liquids as curing agents, biosensors and bioinspired sensors, and electrical/mechanical properties of polymer nanocomposites. The CNT is a legacy 1D nanomaterial, only after which was 2D graphene able to emerge.This is a global and mixed-country authorship Special Issue, with this reprint containing articles from Canada, Saudi Arabia, China, Russia, Spain, India, Japan, the United Arab Emirates (UAE), the USA, Germany, Turkiye, and Malaysia. The Guest Editor is from Singapore and began publishing critical work on the CNT-polymer interface towards the mechanical properties of the nanocomposite up to 20 years ago.

The effort of the Editors has received global attention. Indebtedness is due to Saha and Asif and coworkers from Canada, Joseph and Mahapatra and coworkers from Poland and India, Ramirez-Montoya and coworkers from Spain and Mexico, Mota-Panizio and coworkers from Portugal and Brazil, Izquierdo and Lopez-Coca and coworkers from Spain, Vinitnantharat and coworkers from Thailand and the UK, Roy and Fini and coworkers from India and the USA, Lawson and Luyima and coworkers from Ghana and South Korea, Fouad El Mansouri and coworkers from Morocco and Spain, and Man Zhang and Yaning Zhang and coworkers from China for the 10 scholarly research papers dealing with the synthesis, characterization, properties, and applications of new carbon materials. The applications are mainly centered around environmental remediation owing to the intensity of the problem and comprise of water decontamination and the removal of heavy metals and organic compounds like tannic acid from contaminated sources. The use of biochar in agriculture for preventing nitrogen leaching for soil has also been included. Unconventional carbon-related materials like rice husk ash and carbon steel slag were also used for exotic applications.

Steroids are a large group of compounds whose structure is based on a 17-carbon skeleton, with a specific cyclopentanoperhydrophenanthrene ring system. Natural steroids have been fine-tuned through evolution to build membranes; act as chemical messengers that regulate metabolic, immune and reproductive functions in animals and stimulate the growth of, or otherwise protect, animal organisms. The steroid core represents a suitable motive for structural modifications. Therefore, a large group of semi-synthetic steroid derivatives have occupied the attention of synthetic chemists as well as medicinal chemists due to their potential biological activity, including anticancer, antibacterial, anti-inflammatory and (anti)hormonal activities.This Reprint of the Special Issue of Molecules titled "Steroid Compounds with Potential Biological Activity" is dedicated to both experimental and theoretical studies on steroid chemistry, structural biology, biosynthesis, metabolism, and pharmacology. The Issue focuses on the isolation and synthesis of steroid compounds, diverse in origin, as well as their structural characterization and identification. Published articles and reviews relate to in vitro and in silico studies of the pharmacological properties, molecular biology, biochemistry and structural biology of steroids.

A guide examining one of the most important, yet often most neglected, organ systems in the body - from the mouth, to the stomach, to the pancreas and liver - and how to keep it healthy with herbal medicine and natural healing

Leather and its products are globally traded commodities known for durability, fashion, reuse, repurpose, and resistance to degradation. Despite its benefits, the leather industry faces criticism from Non-Governmental Organizations (NGOs) due to its adverse environmental impact and often unfavourable labor conditions in non-certified tanneries. Efforts to enhance sustainability continue, yet challenges persist, prompting calls for revamping leather processing methods to ensure the industry's future compliance requirements. This monograph, through its 17 chapters, aims to address the multifaceted challenges and opportunities within the leather manufacturing industry, encompassing leather processing, product creation, and policy frameworks. The monograph includes contributions made by researchers, scientists, government officials, industry stakeholders, policymakers, and practitioners from more than 10 countries. It underscores the necessity for developing nations to grasp, address, and enhance their processing and manufacturing infrastructure including labor practices as well as meet export standards, to attain sustainability and compliance. Moreover, the book delves into formulating robust policies governing the leather processing and product sector, emphasizing the need for stringent regulations to mitigate adverse environmental impacts. By offering insights into smart and sustainable leather and leather product manufacturing practices, the book serves as a valuable resource for leather professionals and other stakeholders

This book focuses on the strategies and methods for quality control of Chinese medicines used in prevention and treatment of diseases for thousands of years in China and East Asia. It explains various strategies and methods for quality markers discovery and herbal glycoanalysis, as well as practices for control of heavy metal and pesticide residues. Strategies to overcome the shortage of reference compounds for quality control of Chinese medicines are also provided. The book also introduces analytical techniques for different analytes in Chinese medicines with an emphasis on sample preparation in automation and high extraction efficiency methods, the key process affecting the time and accuracy of the techniques. It is of interest to quality control scientists in academia and industry working on Chinese medicines and/or herbal medicine and also pharmacists, pharmacologists, food chemists, and nutritionists who want to understand Chinese medicines.

Waste-Based Zeolite: Synthesis and Environmental Applications focuses on the use of waste-based materials to fabricate zeolite and its subsequent use in environmental applications. It presents recent progress in zeolite synthesis using wastes products such as fly ash, steel slag, biomass waste, water treatment plant sludge, and municipal waste, among others. It discusses the application of waste-based zeolite for environmental applications such as biodiesel production, as well as considering techniques for recovering spent zeolite. Many industries produce substantial quantities of waste material comprising various hazardous constituents that lead to pollution and threaten the environment. However, such waste can often be a rich source of precursor ingredients for zeolite synthesis, and waste-based zeolites could potentially provide an economically and environmentally viable alternative to commercially available zeolites. This book illuminates this fascinating avenue of research.

Electrochemical potassium storage explores the principles, materials, and technological developments of a variety of battery technologies based on electrochemical potassium storage. It covers the principles of potassium-ion batteries (organic and aqueous electrolytes), potassium metal batteries, potassium-sulfur (selenium) batteries, and potassium-oxygen batteries, as well as the development of the electrode materials of these batteries and the understanding of electrochemical cell operations. Batteries using potassium ions as the charge carrier to store energy operate via different electrochemical processes and have different features of materials electrochemistry compared to lithium-based batteries. Thus, battery technologies based on electrochemical potassium storage exhibit different performance strengths, potentially having diverse market applications. This is particularly important for the search for environmentally and economically sustainable alternatives to conventional lithium-ion batteries in a wide range of applications. This book presents the state-of-the-art development of potassium-based batteries and in-depth discussion on their structure-to-performance relationships.

This volume presents the recent developments in synthetic biodegradable and biobased polymers. The syntheses of many polymer types such as polyesters and polyamides, and also their processing technologies are discussed herein, and new aspects from fundamental and from industrial research are covered. This combination of both perspectives within this volume will be of interest for many research scientists from academia and industry and also for lectures and teachers. Chapters ''BioPBSTM (Polybutylene succinate)'' and ''Polymer biodegradability 2.0: A holistic view on polymer biodegradation in natural and engineered environments'' are available open access under a Creative Commons Attribution 4.0 International License via link.springer.com. For further details see license information in the chapter.

Zeolites are crystalline aluminosilicates possessing a 3D network structure. They are widely considered to have been the leading materials of the last few decades in the fields of chemical engineering, energy sources, and environmental protection. Zeolites with various pore sizes can be obtained with different ratios of SiO2 and Al2O3, demonstrating large specific areas and strong gas adsorption. Therefore, they are commonly used for various processes, such as dehydration, gas separation and synthesis, air pollution control (H2S, SO2, and NOx decontamination), fuel conversion (electrolyte film), petroleum cracking, and others, playing the roles of a membrane, catalyst, and support.This Special Issue is dedicated to novel research and discussions on zeolites, with a focus on, but not limited to, the following: (1) Fundamental research on mechanisms of the formation of pores for zeolites; (2) Zeolites used as the membrane, catalyst, and support; (3) Theoretical simulation and machine learning research for zeolites; (4) Novel applications for zeolites; (5) Related porous materials

Often, a project's sustainability is centred on building services and energy, but we need to have a comprehensive view of how we integrate deeper sustainability. Traditionally, we have neglected embodied carbon generated during building construction, which has led to significant carbon emissions over the last few decades, causing global warming and other related problems. The aim of this Special Issue was to collect the results of research and practice experiences in sustainable building structures, made from steel, concrete, timber, and other composite materials. Dr Roy and Dr Ananthi warmly invited authors to submit their papers for potential inclusion in this Special Issue of "Sustainable construction using steel, concrete, timber, and other composite materials", in the journal of Journal of Composites Science.

This Special Issue provides an update on the state of the art and current trends in polymeric drug delivery systems specifically designed for improving drug bioavailability. The multiple contributions received further strengthen the role of polymers in modern drug delivery and targeting, illustrating the different approaches possible and unveiling what the future may bring.

This book bridges the gap between physical foundations and medical applications of the NMR and MRI technologies, making them accessible to both physicists and biomedical scientists. The physical basis of these technologies is discussed in a manner that can be easily understood by scientists from different backgrounds, aiding them in gaining a clearer understanding of the subject.. For instance, the medical applications of NMR and MRI technologies are described in a way that is accessible to physicists. Moreover, geometrical descriptions and specific mathematical tools are used to facilitate the visualizations of many concepts. Furthermore, the book covers modern technologies such as hyperpolarization and several other state-of-the-art techniques, along with their foundations.

The term nutraceuticals is applied to the products isolated from the herbal sources, nutrients or dietary supplements, processed foods, (cereals, soup and beverages) and specific diets, that may also used as medicine other than nutrition. It usually refers to the foods derived products which may sell in medicinal form, possessing physiological benefits to the host while promoting health and wellness and provide protection against chronic disorders. They may also increase the life expectancy, delay the aging and/or support the structure and function of the body organs. Demand for nutraceuticals with potential to prevent and treat chronic disorders has been interestingly increasing over the past few years. Based on food sources, nutraceuticals are classified into dietary fibers, probiotics, prebiotics, polyunsaturated fatty acids (PUFAs), vitamins, polyphenols and spices. A dietary supplement is generally considered as product containing vitamins, minerals, amino acids, and medicinal plants that are indented to be used to supplement the diet or a concentrate, metabolite, constituent, extract, or combinations of these ingredients. Broadly, nutraceuticals are any of these ingredients or supplements using for health purposes other than nutrition. This book on the fundamentals of Nutraceuticals is organized in two parts i.e., the introductory aspects of macro- and micro-nutrients, gut microbiota regulation, nutraceuticals and drug interactions, while the second part is focusing on the biological benefits of nutraceuticals in different disease states. Besides, this book is also addressing the safety aspects of nutraceuticals and phytotherapeutic support in pregnancy. Including contributions from the experts in the field, target audience (pharmacists, nutritionists, other healthcare providers, and researchers in food and nutrition sector) will be benefited with the updated literature on nutraceuticals and dietary supplements.

Essentials of Chemistry: General, Organic, and Biochemistry, Volume I provides students with a brief yet complete guide to foundational knowledge and concepts in chemistry. The opening chapter discusses the atom, with content on atomic theory, elements and nuclides, substances and mixtures, energy changes, and more. Additional chapters address chemical elements and the periodic table, bonds and compounds, chemical changes, chemical calculations, and aqueous solutions. Students learn about the states of matter; acids, bases, and salts; and nuclear chemistry. The closing chapter presents an introduction to organic chemistry. Each chapter features a Threads from Previous Chapters section that highlights information from previous chapters that is necessary for full comprehension of the present chapter; a Setting the Stage section to prepare students to learn; learning objectives; a chapter summary; skill-check exercises; and end-of-chapter concept reviews. Appendices at the back of the book provide solutions to odd problems for all problem sets throughout the text. Essentials of Chemistry is the first textbook in a two-volume series designed to help students learn and apply critical information and skillsets within the discipline. AuthorsOwen McDougal is a professor in the Department of Chemistry and Biochemistry and director of the Food and Dairy Innovation Center at Boise State University, where he teaches courses in general, organic, biological, and food chemistry. Richard Steiner is a professor emeritus of organic chemistry at the University of Utah, where he was associate chair for 35 years. He also taught at University of Western Ontario and Fort Lewis College. Chris Saunders is an associate clinical professor in the Department of Chemistry and Biochemistry at Boise State University, where he teaches a mix of general chemistry and biochemistry courses. Eric Snyder has been teaching and tutoring chemistry and physics at the high school and university levels for over 20 years. He has a particular interest in chemistry pedagogy.