A skillful balance of theoretical considerations and practical know-how Backed by a team of expert contributors, the Second Edition of this highly acclaimed publication brings a solid understanding ...of impedance spectroscopy to students, researchers, and engineers in physical chemistry, electrochemistry, and physics. Starting with general principles, the book moves on to explain in detail practical applications for the characterization of materials in electrochemistry, semiconductors, solid electrolytes, corrosion, solid-state devices, and electrochemical power sources. The book covers all of the topics needed to help readers identify whether impedance spectroscopy may be an appropriate method for their particular research problem. The book helps readers quickly grasp how to apply their new knowledge of impedance spectroscopy methods to their own research problems through the use of unique features such as: * Step-by-step instructions for setting up experiments and then analyzing the results * Theoretical considerations for dealing with modeling, equivalent circuits, and equations in the complex domain * Best measurement methods for particular systems and alerts to potential sources of errors * Equations for the most widely used impedance models * Figures depicting impedance spectra of typical materials and devices * Extensive references to the scientific literature for more information on particular topics and current research This Second Edition incorporates the results of the last two decades of research on the theories and applications of impedance spectroscopy. Most notably, it includes new chapters on batteries, supercapacitors, fuel cells, and photochromic materials. A new chapter on commercially available measurement systems reflects the emergence of impedance spectroscopy as a mainstream research tool. With its balanced focus on both
theory and practical problem solving, Impedance Spectroscopy: Theory, Experiment, and Applications, Second Edition serves as an excellent graduate-level textbook as well as a hands-on guide and reference for researchers and engineers.
Metal‐organic frameworks (MOFs) have been in the spotlight for a number of years due to their chemical and topological versatility. As MOF research has progressed, highly functionalised materials ...have become desirable for specific applications, and in many cases the limitations of direct synthesis have been realised. This has resulted in the search for alternative synthetic routes, with postsynthetic modification (PSM), a term used to collectively describe the functionalisation of pre‐synthesised MOFs whilst maintaining their desired characteristics, becoming a topic of interest. Advances in the scope of reactions performed are reported regularly; however reactions requiring harsh conditions can result in degradation of the framework. Zirconium‐based MOFs present high chemical, thermal and mechanical stabilities, offering wider opportunities for the scope of reaction conditions that can be tolerated, which has seen a number of successful examples reported. This microreview discusses pertinent examples of PSM resulting in enhanced properties for specific applications, alongside fundamental transformations, which are categorised broadly into covalent modifications, surface transformations, metalations, linker and metal exchange, and cluster modifications.
The chemical and mechanical stabilities of zirconium metal‐organic frameworks (MOFs) make them ideal platforms for postsynthetic modification. This microreview provides an overview of the various techniques for modification and the functionalities that can be incorporated into zirconium MOFs to facilitate different applications.
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Messenger ribonucleoprotein (mRNP) granules are dynamic, self-assembling structures that harbor non-translating mRNAs bound by various proteins that regulate mRNA translation, localization, and ...turnover. Their importance in gene expression regulation is far reaching, ranging from precise spatial-temporal control of mRNAs that drive developmental programs in oocytes and embryos, to similarly exquisite control of mRNAs in neurons that underpin synaptic plasticity, and thus, memory formation. Analysis of mRNP granules in their various contexts has revealed common themes of assembly, disassembly, and modes of mRNA regulation, yet new studies continue to reveal unexpected and important findings, such as links between aberrant mRNP granule assembly and neurodegenerative disease. Continued study of these enigmatic structures thus promises fascinating new insights into cellular function, and may also suggest novel therapeutic strategies in various disease states.
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Non-small-cell lung cancer (NSCLC) constitutes 85% of all lung cancers, and is the leading cause of cancer-related death worldwide. The poor prognosis and resistance to both radiation and ...chemotherapy warrant further investigation into the molecular mechanisms of NSCLC and the development of new, more efficacious therapeutics. The processes of autophagy and apoptosis, which induce degradation of proteins and organelles or cell death upon cellular stress, are crucial in the pathophysiology of NSCLC. The close interplay between autophagy and apoptosis through shared signaling pathways complicates our understanding of how NSCLC pathophysiology is regulated. The apoptotic effect of autophagy is controversial as both inhibitory and stimulatory effects have been reported in NSCLC. In addition, crosstalk of proteins regulating both autophagy and apoptosis exists. Here, we review the recent advances of the relationship between autophagy and apoptosis in NSCLC, aiming to provide few insights into the discovery of novel pathogenic factors and the development of new cancer therapeutics.
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Stress granules and P bodies are conserved cytoplasmic aggregates of nontranslating messenger ribonucleoprotein complexes (mRNPs) implicated in the regulation of mRNA translation and decay and are ...related to RNP granules in embryos, neurons, and pathological inclusions in some degenerative diseases. Using baker’s yeast, 125 genes were identified in a genetic screen that affected the dynamics of P bodies and/or stress granules. Analyses of such mutants, including CDC48 alleles, provide evidence that stress granules can be targeted to the vacuole by autophagy, in a process termed granulophagy. Moreover, stress granule clearance in mammalian cells is reduced by inhibition of autophagy or by depletion or pathogenic mutations in valosin-containing protein (VCP), the human ortholog of CDC48. Because mutations in VCP predispose humans to amyotrophic lateral sclerosis, frontotemporal lobar degeneration, inclusion body myopathy, and multisystem proteinopathy, this work suggests that autophagic clearance of stress granule related and pathogenic RNP granules that arise in degenerative diseases may be important in reducing their pathology.
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•Network of 125 genes identified affecting stress-granule and P body dynamics in yeast•Stress granules are cleared by autophagy in yeast and mammalian cells•Cdc48/VCP facilitates stress-granule clearance•Autophagy of related mRNP aggregates may help avoid degenerative pathology
Proteins linked to modulating stress-granule levels include key autophagy factors, and regulation of these RNP aggregates by autophagic clearance, involving VCP/Cdc48, is conserved in yeast and mammalian cells; this has implications for addressing these kinds of aggregates in neuronal pathologies.
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Staphylococcus aureus is a major pathogen responsible for severe nosocomial and community-associated infections of humans and infections of economically important livestock species. In recent years, ...studies into livestock-associated S. aureus including methicillin-resistant (MRSA) strains have provided new information regarding their origin and host adaptation, and their capacity to cause zoonotic infections of humans. Furthermore, a potential role for human activities such as domestication and industrialisation in the emergence of S. aureus clones affecting livestock has been highlighted. Here, I summarise recent developments in this emerging field and suggest questions of importance for future research efforts.
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DNA double-strand breaks (DSBs) are highly toxic lesions that can drive genetic instability. To preserve genome integrity, organisms have evolved several DSB repair mechanisms, of which nonhomologous ...end-joining (NHEJ) and homologous recombination (HR) represent the two most prominent. It has recently become apparent that multiple layers of regulation exist to ensure these repair pathways are accurate and restricted to the appropriate cellular contexts. Such regulation is crucial, as failure to properly execute DSB repair is known to accelerate tumorigenesis and is associated with several human genetic syndromes. Here, we review recent insights into the mechanisms that influence the choice between competing DSB repair pathways, how this is regulated during the cell cycle, and how imbalances in this equilibrium result in genome instability.
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Dès le début de la Grande Guerre en août 1914, en Europe, les identités ethniques, culturelles et politiques ont été mobilisées pour les champs de bataille. En dépit de la neutralité des Etats-Unis ...et de l’Argentine, les effets de la guerre sont également ressentis dans les rues de New York et de Buenos Aires. L’examen des défilés, des manifestations et des expositions qui ont eu lieu dans les rues de Buenos Aires et de New York entre 1914 et 1917, place la « rue-scène » comme mode d’évaluation de l’effet de la guerre sur les pays neutres. Il approfondit les connaissances de l’environnement urbain en tant que théâtre de guerre en examinant deux villes à la fois semblables par la diversité de leur population et différentes en terme d’autorité politique ce qui en font des cas idéaux pour évaluer l’impact profond du conflit. L’expression, le contrôle et la représentation des identités au sein de ces métropoles démontrent qu’alors que les combats réels étaient ailleurs, la guerre était aussi menée dans les rues de Buenos Aires et de New York.
The stress response in eukaryotic cells often inhibits translation initiation and leads to the formation of cytoplasmic RNA-protein complexes referred to as stress granules. Stress granules contain ...nontranslating mRNAs, translation initiation components, and many additional proteins affecting mRNA function. Stress granules have been proposed to affect mRNA translation and stability and have been linked to apoptosis and nuclear processes. Stress granules also interact with P-bodies, another cytoplasmic RNP granule containing nontranslating mRNA, translation repressors, and some mRNA degradation machinery. Together, stress granules and P-bodies reveal a dynamic cycle of distinct biochemical and compartmentalized mRNPs in the cytosol, with implications for the control of mRNA function.
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Some bacteria can transfer to new host species, and this poses a risk to human health. Indeed, an estimated 60% of all human pathogens have originated from other animal species. Similarly, ...human-to-animal transitions are recognized as a major threat to sustainable livestock production, and emerging pathogens impose an increasing burden on crop yield and global food security. Recent advances in high-throughput sequencing technologies have enabled comparative genomic analyses of bacterial populations from multiple hosts. Such studies are providing new insights into the evolutionary processes that underpin the establishment of bacteria in new host niches. A better understanding of the genetic and mechanistic basis for bacterial host adaptation may reveal novel targets for controlling infection or inform the design of approaches to limit the emergence of new pathogens.
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