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Accounts of Chemical Research

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https://www.readbyqxmd.com/read/28525274/metal-nanoparticle-catalyzed-hydrogen-generation-from-formic-acid
#1
Zhangpeng Li, Qiang Xu
To meet the ever-increasing energy demand, the development of effective, renewable, and environmentally friendly sources of alternative energy is imperative. Hydrogen (H2) is a renewable, clean energy carrier, which exhibits a threefold energy density compared to gasoline; H2 is considered one of the most promising alternative energy carriers for enabling a secure, clean energy future. However, the realization of a hydrogen economy is restricted by several unresolved issues. Particularly, one of the most difficult challenges is the development of a safe, efficient hydrogen storage and delivery system...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28525260/three-dimensional-visualization-and-characterization-of-polymeric-self-assemblies-by-transmission-electron-microtomography
#2
Hiroshi Jinnai, Takeshi Higuchi, Xiaodong Zhuge, Akihito Kumamoto, Kees Joost Batenburg, Yuichi Ikuhara
Self-assembling structures and their dynamical processes in polymeric systems have been investigated using three-dimensional transmission electron microscopy (3D-TEM). Block copolymers (BCPs) self-assemble into nanoscale periodic structures called microphase-separated structures, a deep understanding of which is important for creating nanomaterials with superior physical properties, such as high-performance membranes with well-defined pore size and high-density data storage media. Because microphase-separated structures have become increasingly complicated with advances in precision polymerization, characterizing these complex morphologies is becoming increasingly difficult...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28520407/controlling-configurational-isomerism-in-three-component-colloidal-hybrid-nanoparticles
#3
James M Hodges, Raymond E Schaak
Colloidal hybrid nanoparticles are solution-dispersible constructs that join together multiple distinct nanoscale materials through direct solid-solid interfaces. Given their multifunctionality and synergistic properties that emerge from interfacial coupling, hybrid nanoparticles are of interest for applications in biomedical imaging, solar energy conversion, heterogeneous catalysis, nanophotonics, and beyond. High-order hybrid nanoparticles, which incorporate three or more nanocrystal domains, offer greater tunability and functional diversity relative to one or two-component nanoparticles...
May 18, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28508633/ionic-complexes-of-metal-oxide-clusters-for-versatile-self-assemblies
#4
Bao Li, Wen Li, Haolong Li, Lixin Wu
The combination of rational design of building components and suitable utilization of driving force affords spontaneous molecular assemblies with well-defined nanostructure and morphology over multiple length scales. The serious challenges in constructing assemblies with structural advantages for the realization of functions programmed into the building components usually lie ahead since the process that occurs does not always follow the expected roadmap in the absence of external intervention. Thus, prefabricated intermediates that help in governing the target self-assemblies are developed into a type of unique building blocks...
May 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28493672/correction-to-living-biomaterials
#5
Mark W Tibbitt, Robert Langer
No abstract text is available yet for this article.
May 11, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28492303/a-unique-integration-strategy-for-the-rational-design-of-optically-tunable-near-infrared-fluorophores
#6
Hua Chen, Baoli Dong, Yonghe Tang, Weiying Lin
Fluorescence imaging is a rapidly growing technique for noninvasive imaging of biological molecules and processes with high spatial and temporal resolution. For effective biological imaging, it is essential and important to develop robust fluorescent dyes, in particular, near-infrared (NIR) fluorescent dyes with favorable optical properties. Compared with the visible light emitting dyes, NIR dyes have relatively longer emission wavelengths (650-900 nm) with lower energy and are advantageous as imaging agents owing to the minimum photodamage of NIR light to biological samples, deep penetration into tissues, and low interference from autofluorescence of biomolecules...
May 11, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28489346/metal-organic-frameworks-at-the-biointerface-synthetic-strategies-and-applications
#7
Christian Doonan, Raffaele Riccò, Kang Liang, Darren Bradshaw, Paolo Falcaro
Many living organisms are capable of producing inorganic materials of precisely controlled structure and morphology. This ubiquitous process is termed biomineralization and is observed in nature from the macroscale (e.g., formation of exoskeletons) down to the nanoscale (e.g., mineral storage and transportation in proteins). Extensive research efforts have pursued replicating this chemistry with the overarching aims of synthesizing new materials of unprecedented physical properties and understanding the complex mechanisms that occur at the biological-inorganic interface...
May 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28485945/direct-observation-of-interactions-between-nanoparticles-and-nanoparticle-self-assembly-in-solution
#8
Shu Fen Tan, See Wee Chee, Guanhua Lin, Utkur Mirsaidov
Hierarchically organized nanoparticles (NPs) possess unique properties and are relevant to various technological applications. An important "bottom-up" strategy for building such hierarchical nanostructures is to guide the individual NPs into ordered nanoarchitectures using intermolecular interactions and external forces. However, our current understanding of the nanoscale interactions that govern such self-assembly processes usually relies on post-synthesis/assembly or indirect characterization. Theoretical models that can derive these interactions are presently constrained to systems with only a few particles or on short time scales...
May 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28485596/new-approaches-for-biaryl-based-phosphine-ligand-synthesis-via-p%C3%A2-o-directed-c-h-functionalizations
#9
Yan-Na Ma, Shi-Xia Li, Shang-Dong Yang
Given the important influence of phosphine ligands in transition metal-catalyzed reactions, chemists have searched for straightforward and efficient methodologies for the synthesis of diverse phosphine ligands. Although significant progress has been made in this aspect over the past decades, the development of new phosphorus-containing ligands with properties superior to their predecessors remains a central task for chemists. Recently, researchers have demonstrated that biphenyl monophosphine ligands function as highly efficient ligands for transition-metal-catalyzed organic transformations, especially for reactions where chelating bisphosphine ligands cannot be used...
May 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28485593/structural-studies-of-hydrographenes
#10
Elena Vishnyakova, Gaowei Chen, Bruce E Brinson, Lawrence B Alemany, W Edward Billups
As a result of the unique physical and electrical properties, graphene continues to attract the interest of a large segment of the scientific community. Since graphene does not occur naturally, the ability to exfoliate and isolate individual layers of graphene from graphite is an important and challenging process. The interlayer cohesive energy of graphite that results from van der Waals attractions has been determined experimentally to be 61 meV per carbon atom (61 meV/C atom). This requires the development of a method to overcome the strong attractive forces associated with graphite...
May 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28485577/site-selective-conjugation-of-native-proteins-with-dna
#11
Julie B Trads, Thomas Tørring, Kurt V Gothelf
Conjugation of DNA to proteins is increasingly used in academia and industry to provide proteins with tags for identification or handles for hybridization to other DNA strands. Assay technologies such as immuno-PCR and proximity ligation and the imaging technology DNA-PAINT require DNA-protein conjugates. In DNA nanotechnology, the DNA handle is exploited to precisely position proteins by self-assembly. For these applications, site-selective conjugation is almost always desired because fully functional proteins are required to maintain the specificity of antibodies and the activity of enzymes...
May 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28481075/innovative-nanosensor-for-disease-diagnosis
#12
Sang-Joon Kim, Seon-Jin Choi, Ji-Soo Jang, Hee-Jin Cho, Il-Doo Kim
As a futuristic diagnosis platform, breath analysis is gaining much attention because it is a noninvasive, simple, and low cost diagnostic method. Very promising clinical applications have been demonstrated for diagnostic purposes by correlation analysis between exhaled breath components and specific diseases. In addition, diverse breath molecules, which serve as biomarkers for specific diseases, are precisely identified by statistical pattern recognition studies. To further improve the accuracy of breath analysis as a diagnostic tool, breath sampling, biomarker sensing, and data analysis should be optimized...
May 8, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28481074/atomic-resolution-transmission-electron-microscopic-movies-for-study-of-organic-molecules-assemblies-and-reactions-the-first-10-years-of-development
#13
Eiichi Nakamura
A molecule is a quantum mechanical entity. "Watching motions and reactions of a molecule with our eyes" has therefore been a dream of chemists for a century. This dream has come true with the aid of the movies of atomic-resolution transmission electron microscopic (AR-TEM) molecular images through real-time observation of dynamic motions of single organic molecules (denoted hereafter as single-molecule atomic-resolution real-time (SMART) TEM imaging). Since 2007, we have reported movies of a variety of single organic molecules, organometallic molecules, and their assemblies, which are rotating, stretching, and reacting...
May 8, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28480714/nanoparticle-protein-interactions-therapeutic-approaches-and-supramolecular-chemistry
#14
Mathis Kopp, Sebastian Kollenda, Matthias Epple
Research on nanoparticles has evolved into a major topic in chemistry. Concerning biomedical research, nanoparticles have decisively entered the field, creating the area of nanomedicine where nanoparticles are used for drug delivery, imaging, and tumor targeting. Besides these functions, scientists have addressed the specific ways in which nanoparticles interact with biomolecules, with proteins being the most prominent example. Depending on their size, shape, charge, and surface functionality, specifically designed nanoparticles can interact with proteins in a defined way...
May 8, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28475313/signal-sensing-and-transduction-by-histidine-kinases-as-unveiled-through-studies-on-a-temperature-sensor
#15
Luciano A Abriata, Daniela Albanesi, Matteo Dal Peraro, Diego de Mendoza
Histidine kinases (HK) are the sensory proteins of two-component systems, responsible for a large fraction of bacterial responses to stimuli and environmental changes. Prototypical HKs are membrane-bound proteins that phosphorylate cognate response regulator proteins in the cytoplasm upon signal detection in the membrane or periplasm. HKs stand as potential drug targets but also constitute fascinating systems for studying proteins at work, specifically regarding the chemistry and mechanics of signal detection, transduction through the membrane, and regulation of catalytic outputs...
May 5, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28467707/plane-wave-density-functional-theory-meets-molecular-crystals-thermal-ellipsoids-and-intermolecular-interactions
#16
Volker L Deringer, Janine George, Richard Dronskowski, Ulli Englert
Molecular compounds, organic and inorganic, crystallize in diverse and complex structures. They continue to inspire synthetic efforts and "crystal engineering", with implications ranging from fundamental questions to pharmaceutical research. The structural complexity of molecular solids is linked with diverse intermolecular interactions: hydrogen bonding with all its facets, halogen bonding, and other secondary bonding mechanisms of recent interest (and debate). Today, high-resolution diffraction experiments allow unprecedented insight into the structures of molecular crystals...
May 3, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28467057/conditional-chaperone-client-interactions-revealed-by-genetically-encoded-photo-cross-linkers
#17
Shuai Zhang, Dan He, Zhi Lin, Yi Yang, Haiping Song, Peng R Chen
The cell envelope is an integral and essential component of Gram-negative bacteria. As the front line during host-pathogen interactions, it is directly challenged by host immune responses as well as other harsh extracellular stimuli. The high permeability of the outer-membrane and the lack of ATP energy system render it difficult to maintain important biological activities within the periplasmic space under stress conditions. The HdeA/B chaperone machinery is the only known acid resistant system found in bacterial periplasm, enabling enteric pathogens to survive through the highly acidic human stomach and establish infections in the intestine...
May 3, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28467055/microfluidic-technology-uncovering-the-mechanisms-of-nanocrystal-nucleation-and-growth
#18
Ioannis Lignos, Richard Maceiczyk, Andrew J deMello
The controlled and reproducible formation of colloidal semiconductor nanocrystals (or quantum dots) is of central importance in nanoscale science and technology. The tunable size- and shape-dependent properties of such materials make them ideal candidates for the development of efficient and low-cost displays, solar cells, light-emitting devices, and catalysts. The formidable difficulties associated with the macroscale preparation of semiconductor nanocrystals (possessing bespoke optical and chemical properties) result from the fact that underlying reaction mechanisms are complex and that the reactive environment is difficult to control...
May 3, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28463499/advancing-homogeneous-antimicrobial-glycoconjugate-vaccines
#19
Roberto Adamo
Since 2004, when the first synthetic glycoconjugate vaccine against the pneumonia and meningitis causing bacterium Haemophilus influenza type b (Hib) approved for human use in Cuba was reported, 34 million doses of the synthetic vaccine have been already distributed in several countries under the commercial name of Quimi-Hib. However, despite the success of this product, no other synthetic glycoconjugate vaccine has been licensed in the following 13 years. As well as avoiding the need to handle pathogens, synthetic glycoconjugates offer clear advantages in terms of product characterization and the possibility to understand the parameters influencing immunogenicity...
May 2, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28463492/kinetics-of-electrocatalytic-reactions-from-first-principles-a-critical-comparison-with-the-ab-initio-thermodynamics-approach
#20
Kai S Exner, Herbert Over
Multielectron processes in electrochemistry require the stabilization of reaction intermediates (RI) at the electrode surface after every elementary reaction step. Accordingly, the bond strengths of these intermediates are important for assessing the catalytic performance of an electrode material. Current understanding of microscopic processes in modern electrocatalysis research is largely driven by theory, mostly based on ab initio thermodynamics considerations, where stable reaction intermediates at the electrode surface are identified, while the actual free energy barriers (or activation barriers) are ignored...
May 2, 2017: Accounts of Chemical Research
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