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Spectra of Ionized Atoms: From Laboratory to Space

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ISBN: 9783038428695 9783038428701 Year: Pages: VI, 408 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Physics (General)
Added to DOAB on : 2018-05-04 16:12:05
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The spectra of ionized atoms continue to play an important role in understanding a wide variety of plasmas. The relatively new discipline of Laser-Induced Breakdown Spectroscopy (LIBS) is being used on earth to produce lower ionization stages of atoms for diagnostics of samples, but also in space to determine contents of rocks on Mars and Venus. Spectra of lower stages of ionization are also found in nebulae, interstellar clouds, chemically peculiar stars, and in the sun. For higher ionization stages, there is continuing need for spectra found in the hot plasmas of tokamaks and other machines aimed at developing new energy sources. Since much of the data for these hot plasmas must come from ab initio calculations, laboratory experiments can serve to evaluate the accuracy of the calculations. Experiments with electron beam ion traps (EBITs) can remove all but a few remaining electrons and thus form a basis for evaluating calculations of ions having only a few electrons. This Special Issue of Atoms highlights the need for continuing research on the spectra of all types of ionized atoms.

High-Pressure Studies of Crystalline Materials

ISBN: 9783038971313 9783038971320 Year: Pages: 330 DOI: 10.3390/books978-3-03897-132-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General) --- Mathematics --- Environmental Sciences
Added to DOAB on : 2018-09-20 10:13:12
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[This book is a printed edition of the Special Issue of Crystals: High-Pressure Studies of Crystalline Materials. It also includes additional articles published in Crystals and related to the topic of the Special Issue, which have been selected based upon their relevance and scientific quality.]

Compounds with Polar Metallic Bonding

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ISBN: 9783039210701 9783039210718 Year: Pages: 154 DOI: 10.3390/books978-3-03921-071-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2019-08-28 11:21:27
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The Special Edition 'Compounds with Polar Metallic Bonding' is a collection of eight original research reports presenting a broad variety of chemical systems, analytical methods, preparative pathways and theoretical descriptions of bonding situations, with the common aim of understanding the complex interplay of conduction electrons in intermetallic compounds that possess different types of dipoles. Coulombic dipoles introduced by electronegativity differences, electric or magnetic dipoles, polarity induced by symmetry reduction—all the possible facets of the term 'polarity'—can be observed in polar intermetallic phases and have their own and, in most cases, unique consequences on the physical and chemical behaviour. Elucidation of the structure–property relationships in compounds with polar metallic bonding is a modern and growing scientific field which combines solid state physics, preparative chemistry, metallurgy, modern analytic methods, crystallography, theoretical calculations of the electronic state and many more disciplines.

The Molecular Aspect of Natural Secondary Metabolite Products in Health and Disease

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ISBN: 9783038971764 9783038971771 Year: Pages: 226 DOI: 10.3390/books978-3-03897-177-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Anthropology --- Social and Public Welfare --- Biology
Added to DOAB on : 2018-09-19 09:01:21
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ca. 200 words; this text will present the book in all promotional forms (e.g. flyers). Please describe the book in straightforward and consumer-friendly terms.[Natural secondary metabolite products, which are isolated from plants, animals, microorganisms, etc., are classified as polyketides, isoprenoids, steroids, aromatics, alkaloids, etc. Their chemical diversity and variety of biological activities have attracted the attention of chemists, biochemists, biologists, etc. This Special Issue on "The Molecular Aspect of Natural Secondary Metabolite Products in Health and Disease" is intended to offer biological active natural products as candidates and/or leads for pharmaceuticals, dietary supplements, functional foods, cosmetics, food additives, etc. The research fields of this Special Issue include natural products chemistry, phytochemistry, pharmacognosy, food chemistry, bioorganic synthetic chemistry, molecular pharmacology, molecular nutritional sciences, and other related research fields of bioactive natural secondary metabolite products. Original research and review articles on all topics in these research fields are invited. I look forward to receiving many submissions from outstanding expert on these research fields.

Biological Activity of Natural Secondary Metabolite Products

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ISBN: 9783038971740 9783038971757 Year: Pages: 466 DOI: 10.3390/books978-3-03897-175-7 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Anthropology --- Biology --- Social and Public Welfare
Added to DOAB on : 2018-09-20 12:02:36
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ca. 200 words; this text will present the book in all promotional forms (e.g. flyers). Please describe the book in straightforward and consumer-friendly terms.[Natural secondary metabolite products, which are isolated from plants, animals, microorganisms, etc., are classified as polyketides, isoprenoids, aromatics (phenylpropanoids), alkaloids, etc. Their chemical diversity and variety of biological activities have attracted the attention of chemists, biochemists, biologists, etc. The Special Issue on "Biological Activity of Natural Secondary Metabolite Products" is intended to offer biological active natural products as candidates and/or leads for pharmaceuticals, dietary supplements, functional foods, cosmetics, food additives, etc. The research fields of this Special Issue include natural products chemistry, phytochemistry, pharmacognosy, food chemistry, bioorganic synthetic chemistry, chemical biology, molecular biology, molecular pharmacology, and other related research fields of bioactive natural secondary metabolite products. Original research and review articles on all topics in these research fields are invited. I am looking forward to receiving many submissions from outstanding experts in these research fields.]

Antimicrobial Peptides

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ISBN: 9783038420729 9783038420736 Year: Pages: 336 DOI: 10.3390/books978-3-03842-073-6 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Added to DOAB on : 2015-10-22 10:29:38
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Antimicrobial peptides (AMPs) are gene-encoded, ancient (and important) mediators of innate host defense that exert direct or indirect antimicrobial action as well as possessing other important biologic activities (e.g., neutralization of endotoxin and anti-biofilm action) that help to protect vertebrates, invertebrates and plants from invading pathogens. While the emergence of multi-antibiotic resistant pathogens (and the desperate need to develop new anti-infectives) has been a recent force driving the field, interest in AMPs has an earlier origin in studies of how phagocytes kill bacteria by oxygen-independent processes. AMPs responsible for such killing of microbes by rabbit and human neutrophils were later purified by Ganz, Selsted and Lehrer, which they termed defensins; at the time of this writing, literally thousands of defensin-based publications can be found in the scientific literature! The initial reports on defensins and the earlier report by Boman’s group on the purification and action of an insect AMP represented a historical and defining point for the AMP field as they, in hindsight, demanded the recognition of AMP research as a unique discipline that has important linkages to other important fields of medicine, especially those of microbiology, infectious diseases and immunology. On a personal note, I remember conferences on phagocytes and host defense in the early 1980s where the topic of AMPs was relegated to one short session in a five day period! Now, we have hundreds of international “AMPologists” with expertise in chemistry, biochemistry, molecular and structural biology, cell biology, microbiology, pharmacology, or medicine who have built their research careers around AMPs and can now attend international conferences dedicated to advances in AMP research.

Analysis of Hydrogen Bonds in Crystals

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ISBN: 9783038422457 9783038422464 Year: Pages: XIV, 308 DOI: 10.3390/books978-3-03842-246-4 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General)
Added to DOAB on : 2016-08-29 12:35:45
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There is no doubt that the hydrogen bond is one of the most-often analyzed interactions, and there is also no doubt that experimental studies, especially those based on the determination of crystal structures are very important since they deliver valuable information on the nature of this interaction, on different types of the hydrogen bonds, and also on reactions where a hydrogen bond may be treated as the preliminary step.Since the role of the analysis of crystal structures for investigations concerning hydrogen-bonded systems is valuable, the Editorial Board of Crystals, thus, decided to devote a Special Issue of the journal to the analysis of hydrogen bonds in crystals.

New Insights in Stability, Structure and Properties of Porous Materials

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ISBN: 9783038424512 9783038424505 Year: Pages: VIII, 136 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Environmental Sciences
Added to DOAB on : 2017-07-14 08:13:16
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Porous materials (such as zeolites, clay minerals, and assemblies of oxide nanoparticles) are of great importance for the progress of many technological and environmental fields, such as catalysis, adsorption, separation, and ion exchange, because of their unique pore topologies, tunable structures, and the possibility of introducing active reaction sites.The major goal of this Special Issue was to provide a platform for scientists to discuss new insights in the stability, structure, and properties of porous materials, as well as in innovative aspects of their processing and applications. The emphasis was given as the relationships between the structure and/or chemical composition and the specific physical properties of these materials, as well as their role in mineralogical, technological, green, and sustainable processes. In this Special Issue of Minerals, we provide an up-to-date selection of high-quality original and review papers concerning the physical, chemical, and structural characterization of porous materials, the synthesis of crystalline phases with pores in the appropriate range, structure–property relationships at ambient conditions, but also at high temperatures and/or at high pressures, adsorption, and diffusion of mobile species in porous materials, host–guest interactions and confinement effects, ion exchange, modeling in geological and environmental processes, and new insights in processing and applications. In total, eight topical contributions reflect both the diversity and interdisciplinary of modern mineralogy, bridging together experimentalists and computational approaches.

Polyhedral Structures, Symmetry, and Applications

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ISBN: 9783038426899 9783038426882 Year: Pages: 322 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Mathematics
Added to DOAB on : 2018-02-08 13:24:15
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Symmetry is an intriguing phenomenon manifesting itself in art, nature, and the mind. This Special Issue book features 19 articles about discrete geometric and combinatorial polyhedral structures, with symmetry as the unifying theme. These articles present an attractive mix of topics and have appeared in two related Special Issues of Symmetry, on "Polyhedra" in 2012/2013 and on "Polyhedral Structures" in 2016/2017. Specific topic areas covered include polyhedra, tilings, and crystallography; abstract polyhedra, maps on surfaces, and graphs; and polyhedral structures, arts, and architectural design.

Phytoalexins: Current Progress and Future Prospects

ISBN: 9783038420583 9783038420590 Year: Pages: 516 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Added to DOAB on : 2016-05-12 11:33:35
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Phytoalexins are antimicrobial substances of low molecular weight produced by plants in response to infection or stress, which form part of their active defense mechanisms. It is now clear that phytoalexins exhibit toxicity across much of the biological spectrum, prokaryotic and eukaryotic. Starting in the 1950s, research on phytoalexins has begun with biochemistry and bio-organic chemistry, resulting in the determination of their structure, their biological activity as well as mechanisms of their synthesis and their catabolism by microorganisms. Elucidation of the biosynthesis of numerous phytoalexins has also permitted the use of molecular biology tools for the exploration of the genes encoding enzymes of their synthesis pathways and their regulators. This has led to potential applications for increasing plant resistance to diseases. Phytoalexins display an enormous diversity belonging to various chemical families such as isoflavones, isoflavanones, pterocarpans, isoflavans, flavanones, coumestans, furanoacetylenes, phenylpropanoids, steroid glycoalkaloids, norsesquiterpenoids/sesquiterpenoids, coumarins, diterpenes, ent-kaurane-related diterpenoids, acidic sesquiterpenoids, 3-deoxyanthocyanidins, naphthaldehydes, indoles and stilbenes.Research papers dealing with all aspects of phytoalexins, including structure elucidation; chemical synthesis; methods for phytoalexin analysis in plant extracts or biological fluids; biosynthesis studies including modulation of phytoalexin synthesis; engineering of phytoalexin biochemical pathways in plants and microbes; biological activities; structure/activity relationships; phytoalexin metabolism in planta and by micro-organisms; roles and ATP Binding Cassette (ABC) transporters or Multi-Drugs Efflux (MDE) transporters are welcome for inclusion in this Special Issue of Molecules. Review articles, particularly those dealing with the themes mentioned above are also particularly welcome for inclusion.

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