1,430,177 results match your criteria Structure London England : 1993[Journal]


Raman characterization of single-crystalline Ga0.96Mn0.04As:Zn nanowires realized by ion-implantation.

Nanotechnology 2019 Apr 24. Epub 2019 Apr 24.

Universidade Federal do Pará, Belem, 66075-110, BRAZIL.

Recent progress in the realization of magnetic GaAs nanowires doped with Mn has attracted a lot of attention due to their potential application in spintronics. In this work, we present a detailed Raman investigation of the structural properties of Zn doped GaAs (GaAs:Zn) and Mn-implanted GaAs:Zn (Ga0.96Mn0. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1beaDOI Listing

Modular Architecture of the STING C-Terminal Tail Allows Interferon and NF-κB Signaling Adaptation.

Cell Rep 2019 Apr;27(4):1165-1175.e5

Department of Microbiology, Harvard Medical School, Boston, MA 02115, USA; Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute, Boston, MA 02115, USA; Parker Institute for Cancer Immunotherapy at Dana-Farber Cancer Institute, Boston, MA 02115, USA. Electronic address:

Stimulator of interferon genes (STING) is a key regulator of type I interferon and pro-inflammatory responses during infection, cellular stress, and cancer. Here, we reveal a mechanism for how STING balances activation of IRF3- and NF-κB-dependent transcription and discover that acquisition of discrete signaling modules in the vertebrate STING C-terminal tail (CTT) shapes downstream immunity. As a defining example, we identify a motif appended to the CTT of zebrafish STING that inverts the typical vertebrate signaling response and results in dramatic NF-κB activation and weak IRF3-interferon signaling. Read More

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http://dx.doi.org/10.1016/j.celrep.2019.03.098DOI Listing

Sequence and Nuclease Requirements for Breakage and Healing of a Structure-Forming (AT)n Sequence within Fragile Site FRA16D.

Cell Rep 2019 Apr;27(4):1151-1164.e5

Department of Biology, Tufts University, Suite 4700, 200 Boston Ave., Medford, MA 02155, USA; Program in Genetics, Sackler School of Graduate Biomedical Sciences, Tufts University, Boston, MA 02111, USA. Electronic address:

Common fragile sites (CFSs) are genomic regions that display gaps and breaks in human metaphase chromosomes under replication stress and are often deleted in cancer cells. We studied an ∼300-bp subregion (Flex1) of human CFS FRA16D in yeast and found that it recapitulates characteristics of CFS fragility in human cells. Flex1 fragility is dependent on the ability of a variable-length AT repeat to form a cruciform structure that stalls replication. Read More

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http://dx.doi.org/10.1016/j.celrep.2019.03.103DOI Listing

Single Nanoparticle Electrochemistry.

Annu Rev Anal Chem (Palo Alto Calif) 2019 Apr 24. Epub 2019 Apr 24.

School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China; email: ;

Experimental techniques to monitor and visualize the behaviors of single nanoparticles have not only revealed the significant spatial and temporal heterogeneity of those individuals, which are hidden in ensemble methods, but more importantly, they have also enabled researchers to elucidate the origin of such heterogeneity. In pursuing the intrinsic structure-function relations of single nanoparticles, the recently developed stochastic collision approach demonstrated some early promises. However, it was later realized that the appropriate sizing of a single nanoparticle by an electrochemical method could be far more challenging than initially expected owing to the dynamic motion of nanoparticles in electrolytes and complex charge-transfer characteristics at electrode surfaces. Read More

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http://dx.doi.org/10.1146/annurev-anchem-061318-114902DOI Listing

A Variational Relativistic Two-Component Complete Active Space Self-Consistent Field Method.

J Chem Theory Comput 2019 Apr 24. Epub 2019 Apr 24.

The accurate description of the electronic structure of transition metals and their compounds can be complicated by both the large number of close-lying states that often have multi-configurational nature in addition to significant relativistic effects. In order to address these challenges we present a two-component complete-active-space self-consistent field method that includes scalar relativistic effects and one-electron spin-orbit coupling during the self-consistent wave function optimization procedure. These relativistic effects are included via an "exact two-component" transformation of the solution of the one-electron modified Dirac equation. Read More

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http://dx.doi.org/10.1021/acs.jctc.9b00011DOI Listing

Heterogeneous Occupancy and Vibrational Dynamics of Spatially Patterned Water Molecules.

J Phys Chem B 2019 Apr 24. Epub 2019 Apr 24.

We performed first principles molecular dynamics simulations of relatively dilute aqueous solutions of sulfate and thiosulfate dianions to analyze the structure, dynamics and vibrational spectral properties of water molecules around the solute, especially the spatially patterned solvent molecules in the first solvation layer and the extended layers. This study also involves the investigation of dynamics of dangling OH groups in these layers and their role in patterning the water molecules around the dianions. Structural evaluation of the systems is carried out by radial distribution functions (RDFs), number integrals (NIs) and spatial distribution functions (SDFs). Read More

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http://dx.doi.org/10.1021/acs.jpcb.9b00271DOI Listing

β-Chitin nano-Fibrils Self-Assembly in Aqueous Environments.

Biomacromolecules 2019 Apr 24. Epub 2019 Apr 24.

Chitin is one of the most studied biopolymers but the understanding of how it assembles from molecules to micro-fibers is still limited. Organisms are able to assemble chitin with precise control over polymorphism, texture, and final morphology. The produced hierarchical structure leads to materials with outstanding mechanical properties. Read More

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http://dx.doi.org/10.1021/acs.biomac.9b00481DOI Listing

Strongly Coupled Pyridine-V O ·nH O Nanowires with Intercalation Pseudocapacitance and Stabilized Layer for High Energy Sodium Ion Capacitors.

Small 2019 Apr 24:e1900379. Epub 2019 Apr 24.

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Hubei, Wuhan, 430070, P. R. China.

Developing pseudocapacitive cathodes for sodium ion capacitors (SICs) is very significant for enhancing energy density of SICs. Vanadium oxides cathodes with pseudocapacitive behavior are able to offer high capacity. However, the capacity fading caused by the irreversible collapse of layer structure remains a major issue. Read More

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http://dx.doi.org/10.1002/smll.201900379DOI Listing

A theory of pulse dynamics and disturbance in ecology.

Ecology 2019 Apr 24:e02734. Epub 2019 Apr 24.

Biology, University of North Carolina at Chapel Hill, USA.

We propose four postulates as the minimum set of logical propositions necessary for a theory of pulse dynamics and disturbance in ecosystems: 1) 'Resource Dynamics' characterizes the magnitude, rate, and duration of resource change caused by pulse events, including the continuing changes in resources that are the result of abiotic and biotic processes; 2) 'Energy Flux' characterizes the energy flow that controls the variation in the rates of resource assimilation across ecosystems; 3) 'Patch Dynamics' characterizes the distribution of resource patches over space and time, and the resulting patterns of biotic diversity, ecosystem structure, and cross-scale feedbacks of pulses processes; and 4) 'Biotic Trait Diversity' characterizes the evolutionary responses to pulse dynamics and, in turn, the way trait diversity affects ecosystem dynamics during and after pulse events. We apply the four postulates to an important class of pulse events, biomass-altering disturbances, and derive seven generalizations that predict disturbance magnitude, resource trajectory, rate of resource change, disturbance probability, biotic trait diversification at evolutionary scales, biotic diversity at ecological scales, and functional resilience. Ultimately, theory must define the variable combinations that result in dynamic stability, comprising resistance, recovery, and adaptation. Read More

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http://dx.doi.org/10.1002/ecy.2734DOI Listing

An approach for visualizing the spatial metabolome of an entire plant root system inspired by the Swiss-rolling technique.

J Mass Spectrom 2019 Apr 24. Epub 2019 Apr 24.

Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, 99352.

The spatial configuration and morphology of roots are commonly monitored for a better understanding of plant health and development. However, this approach provides minimal details about the biochemistry regulating the observable traits. Therefore, the ability to metabolically map the entire root structure would be of major value. Read More

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http://dx.doi.org/10.1002/jms.4363DOI Listing

Salmonella invasion is controlled through the secondary structure of the hilD transcript.

PLoS Pathog 2019 Apr 24;15(4):e1007700. Epub 2019 Apr 24.

Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States of America.

Virulence functions of bacterial pathogens are often energetically costly and thus are subjected to intricate regulatory mechanisms. In Salmonella, invasion of the intestinal epithelium, an essential early step in virulence, requires the production of a multi-protein type III secretion apparatus. The pathogen mitigates the overall cost of invasion by inducing it in only a fraction of its population. Read More

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http://dx.doi.org/10.1371/journal.ppat.1007700DOI Listing

Shrubs indirectly increase desert seedbanks through facilitation of the plant community.

PLoS One 2019 24;14(4):e0215988. Epub 2019 Apr 24.

Department of Biology, York University, Toronto, Ontario, Canada.

The mechanisms supporting positive ecological interactions are important. Foundation species can structure desert biodiversity by facilitating seedbanks of annual plants, but the direct and indirect mechanisms of shrub effects on seedbank have not been experimentally decoupled. We conducted the first test of shrubs increasing seedbank densities through direct effects on the seedbank (i. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215988PLOS

The N-terminus of Sec61p plays key roles in ER protein import and ERAD.

PLoS One 2019 24;14(4):e0215950. Epub 2019 Apr 24.

Faculty of Natural Sciences and Technology, Saarland University, Saarbruecken, Germany.

Sec61p is the channel-forming subunit of the heterotrimeric Sec61 complex that mediates co-translational protein import into the endoplasmic reticulum (ER). In yeast, proteins can also be post-translationally translocated by the hetero-heptameric Sec complex, composed of the Sec61 and the Sec63 complexes. The Sec61 channel is also a candidate for the dislocation channel for misfolded proteins from the ER to the cytosol during ER-associated degradation (ERAD). Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215950PLOS

Energy, hierarchy and the origin of inequality.

Authors:
Blair Fix

PLoS One 2019 24;14(4):e0215692. Epub 2019 Apr 24.

York University, Toronto, Ontario, Canada.

Where should we look to understand the origin of inequality? I propose an unusual window of evidence-modern societies. I hypothesize that evidence for the origin of inequality is encoded in the institutional structure of industrial societies. To test this idea, I use a model to project modern trends into the past. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215692PLOS
April 2019
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Population genetic differentiation of the hydrothermal vent crab Austinograea alayseae (Crustacea: Bythograeidae) in the Southwest Pacific Ocean.

PLoS One 2019 24;14(4):e0215829. Epub 2019 Apr 24.

Global Ocean Resources Research Center, Korea Institute of Ocean Science & Technology, Busan Metropolitan City, Republic of Korea.

To understand the origin, migration, and distribution of organisms across disjunct deep-sea vent habitats, previous studies have documented the population genetic structures of widely distributed fauna, such as gastropods, bivalves, barnacles, and squat lobsters. However, a limited number of investigations has been conducted in the Southwest Pacific Ocean, and many questions remain. In this study, we determined the population structure of the bythograeid crab Austinograea alayseae from three adjacent vent systems (Manus Basin, North Fiji Basin, and Tonga Arc) in the Southwest Pacific Ocean using the sequences of two mitochondrial genes (COI and 16S rDNA) and one nuclear gene (28S rDNA). Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215829PLOS

Mentoring stages: A study of undergraduate mentoring in palliative medicine in Singapore.

PLoS One 2019 24;14(4):e0214643. Epub 2019 Apr 24.

Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore.

Background: Mentoring nurtures a mentee's personal and professional development. Yet conflation of mentoring approaches and a failure to contend with mentoring's nature makes it difficult to study mentoring processes and relationships. This study aims to understand of mentee experiences in the Palliative Medicine Initiative (PMI). Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0214643PLOS

Plant protection product dose rate estimation in apple orchards using a fuzzy logic system.

PLoS One 2019 24;14(4):e0214315. Epub 2019 Apr 24.

University of Maribor, Faculty of Mechanical Engineering, Laboratory for Structure Evaluation, Maribor, Slovenia.

In the process of applying a plant protection product mixed with water (spray mixture) at the prescribed concentration with conventional sprayers for chemical protection of tree canopies in an orchard, standard models are used to express the dose rate of the plant protection product. Characteristic properties of the tree canopy in an orchard are not taken into consideration. Such models result in fixed quantities of spray mixture being sprayed through individual nozzles into a tree canopy. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0214315PLOS

A late Pleistocene human footprint from the Pilauco archaeological site, northern Patagonia, Chile.

PLoS One 2019 24;14(4):e0213572. Epub 2019 Apr 24.

Instituto de Ciencias de la Tierra, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile.

The present study describes the discovery of a singular sedimentary structure corresponding to an ichnite that was excavated at the paleo-archaeological site Pilauco (Osorno, Chile). The trace fossil is associated with megafauna bones, plant material and unifacial lithic tools. Here we present a detailed analysis of the Pilauco ichnite and associated sedimentary structures, as well as new radiocarbon data. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0213572PLOS

Long-term fish assemblages of the Ohio River: Altered trophic and life history strategies with hydrologic alterations and land use modifications.

PLoS One 2019 24;14(4):e0211848. Epub 2019 Apr 24.

Department of Biology, Ball State University, Muncie, Indiana, United States of America.

Long-term monitoring of species assemblages provides a unique opportunity to test hypotheses regarding environmentally induced directional trajectories of freshwater species assemblages. We used 57 years of lockchamber fish rotenone and boat electrofishing survey data (1957-2014) collected by the Ohio River Valley Water Sanitation Commission (ORSANCO) to test for directional trajectories in taxonomy, trophic classifications, and life history strategies of freshwater fish assemblages in the Ohio River Basin. We found significant changes in taxonomic and trophic composition of freshwater fishes in the Ohio River Basin. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0211848PLOS

The Magic of Mechanism to Explanation-Based Instruction on Counterintuitive Concepts in Early Childhood.

Authors:
Deborah Kelemen

Perspect Psychol Sci 2019 Apr 24:1745691619827011. Epub 2019 Apr 24.

Department of Psychological and Brain Sciences, Boston University.

Common-sense intuitions can be useful guides in everyday life and problem solving. However, they can also impede formal science learning and provide the basis for robust scientific misconceptions. Addressing such misconceptions has generally been viewed as the province of secondary schooling. Read More

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http://dx.doi.org/10.1177/1745691619827011DOI Listing

Validation of the Spanish Version of the Beginning Breastfeeding Survey-Cumulative: A Follow-up Study.

J Hum Lact 2019 Apr 24:890334419840003. Epub 2019 Apr 24.

2 Department of Nursing, University of Alicante, Alicante, Spain.

Background: The Beginning Breastfeeding Survey-Cumulative (BBSC) is an instrument that assesses the overall maternal perception of breastfeeding effectiveness during the early postpartum period.

Research Aims: The aims of this study were to adapt and validate a Spanish version of the BBSC and provide new evidence regarding its validity.

Methods: A standard forward and back-translation process was used to obtain the Spanish version of the questionnaire (BBSC-E). Read More

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http://dx.doi.org/10.1177/0890334419840003DOI Listing

Chromosome detachment from the nuclear envelope is required for genome stability in closed mitosis.

Authors:
Rey-Huei Chen

Mol Biol Cell 2019 Apr 24:mbcE19020098. Epub 2019 Apr 24.

Institute of Molecular Biology, Academia Sinica, Taipei, 11529, TAIWAN.

Mitosis in metazoans involves detachment of chromosomes from the nuclear envelope (NE) and NE breakdown, whereas yeast maintains the nuclear structure throughout mitosis. It remains unknown how chromosome attachment to the NE might affect chromosome movement in yeast. By using a rapamycin-induced dimerization system to tether specific locus of the chromosome to the NE, I found that the tethering delays the separation and causes missegregation of the region distal to the tethered site. Read More

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http://dx.doi.org/10.1091/mbc.E19-02-0098DOI Listing

A General TR-FRET Assay Platform for High-Throughput Screening and Characterizing Inhibitors of Methyl-Lysine Reader Proteins.

SLAS Discov 2019 Apr 24:2472555219844569. Epub 2019 Apr 24.

2 Center for Integrative Chemical Biology and Drug Discovery, Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

Chromatin regulatory complexes localize to specific sites via recognition of posttranslational modifications (PTMs) on N-terminal tails of histone proteins (e.g., methylation, acetylation, and phosphorylation). Read More

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http://dx.doi.org/10.1177/2472555219844569DOI Listing

Correlative SICM-FCM reveals changes in morphology and kinetics of endocytic pits induced by disease-associated mutations in dynamin.

FASEB J 2019 Apr 24:fj201802635R. Epub 2019 Apr 24.

Division of Experimental Medicine, Department of Medicine, Imperial College London, London, United Kingdom.

Dynamin 2 (DNM2) is a GTP-binding protein that controls endocytic vesicle scission and defines a whole class of dynamin-dependent endocytosis, including clathrin-mediated endocytosis by caveoli. It has been suggested that mutations in the gene, associated with 3 inherited diseases, disrupt endocytosis. However, how exactly mutations affect the nanoscale morphology of endocytic machinery has never been studied. Read More

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https://www.fasebj.org/doi/10.1096/fj.201802635R
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http://dx.doi.org/10.1096/fj.201802635RDOI Listing
April 2019
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A Combined Experimental and Computational Study on the Reaction Dynamics of the 1-Propynyl (CHCC) - 1,3-Butadiene (CHCHCHCH) System and the Formation of Toluene Under Single Collision Conditions.

J Phys Chem A 2019 Apr 24. Epub 2019 Apr 24.

The crossed beams reactions of the 1-propynyl radical (CHCC; XA) with 1,3-butadiene (CHCHCHCH; XA), 1,3-butadiene-d (CDCDCDCD; XA), 1,3-butadiene-d (CDCHCHCD; XA), and 1,3-butadiene-d (CHCDCDCH; XA) were performed under single collision conditions at collision energies of about 40 kJ mol. The underlying reaction mechanisms were unraveled through the combination of the experimental data with electronic structure calculations at the CCSD(T)-F12/cc-pVTZ-f12//B3LYP/6-311G(d,p) + ZPE(B3LYP/6-311G(d,p) level of theory along with statistical Rice-Ramsperger-Kassel-Marcus (RRKM) calculations.Together, these data suggest the formation of at least toluene (CH) via the barrierless addition of 1-propynyl to the 1,3-butadiene terminal carbon atom forming a low-lying CH intermediate that undergoes multiple isomerization steps resulting in cyclization and ultimately aromatization following hydrogen atom elimination. Read More

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http://dx.doi.org/10.1021/acs.jpca.9b00092DOI Listing

Overtones of νC≡N Vibration as a Probe of Structure of Liquid CHCN, CDCN and CClCN. Combined IR, NIR, and Raman Spectroscopic Studies with Anharmonic DFT Calculations.

J Phys Chem A 2019 Apr 24. Epub 2019 Apr 24.

The νCN band ( νC≡N) is a sensitive probe of the state of compounds with nitrile groups. Hence, physicochemical properties of acetonitrile and its derivatives have been frequently investigated by means of vibrational (IR and Raman) spectroscopy. Near-infrared (NIR) spectroscopy combined with high-level quantum mechanical calculations offers deeper physical insight into the structure of liquid nitriles, not available from the fundamental region. Read More

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http://dx.doi.org/10.1021/acs.jpca.9b02170DOI Listing

Leucinostatin Y: A Peptaibiotic Produced by the Entomoparasitic Fungus Purpureocillium lilacinum 40-H-28.

J Nat Prod 2019 Apr 24. Epub 2019 Apr 24.

Institute of Microbial Chemistry (BIKAKEN) , Numazu, 18-24 Miyamoto , Numazu-shi , Shizuoka 410-0301 , Japan.

Leucinostatin Y, a new peptaibiotic, was isolated from the culture broth of the entomoparasitic fungus Purpureocillium lilacinum 40-H-28. The planar structure was elucidated by detailed analysis of its NMR and MS/MS data. The absolute configurations of the amino acids were partially determined by an advanced Marfey's method. Read More

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http://dx.doi.org/10.1021/acs.jnatprod.8b00839DOI Listing

Comparison of the structures and mechanisms of the pistol and hammerhead ribozymes.

J Am Chem Soc 2019 Apr 24. Epub 2019 Apr 24.

Comparison of the secondary and three-dimensional structures of the hammerhead and pistol ribozymes reveal many close similarities, so in this work we have asked if they are mechanistically identical. We have determined a new crystal structure of the pistol ribozyme, and have shown that G40 acts as general base in the cleavage reaction. The conformation in the active site ensures an in-line attack of the O2' nucleophile, and the conformation at the scissile phosphate and the position of the general base are closely similar to those in the hammerhead ribozyme. Read More

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http://dx.doi.org/10.1021/jacs.9b02141DOI Listing

The Mosaic of Rottlerin: The Sequel.

J Nat Prod 2019 Apr 24. Epub 2019 Apr 24.

School of Chemistry , UNSW Australia , Sydney , NSW 2052 , Australia.

Rottlerin (1) is a potent protein kinase C δ inhibitor that possesses a wide range of biological activities. However, the potential of this molecule to be developed as a drug has been restricted by its limited availability. We report herein a gram scale quantity synthesis of rottlerin in a five-step synthetic route that can be completed within 2 days. Read More

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http://dx.doi.org/10.1021/acs.jnatprod.8b00917DOI Listing
April 2019
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Tubelike Uranyl-Phenylenediacetate Assemblies from Screening of Ligand Isomers and Structure-Directing Counterions.

Inorg Chem 2019 Apr 24. Epub 2019 Apr 24.

ISIS , Université de Strasbourg , 8 allée Gaspard Monge , 67083 Strasbourg , France.

Reaction of 1,2-, 1,3-, or 1,4-phenylenediacetic acids (1,2-, 1,3-, or 1,4-HPDA) with uranyl ions under solvo-hydrothermal conditions and in the presence of [M(L) ] cations, in which M = transition metal cation, L = 2,2'-bipyridine (bipy) or 1,10-phenanthroline (phen), n = 2 or 3, and q = 1 or 2, gave 10 complexes which have been crystallographically characterized. The diacetate ligands are bis-chelating and the uranyl cations are tris-chelated in all cases. [UO(1,2-PDA)Zn(phen)]·2HO (1) and [UO(1,4-PDA)Mn(bipy)]·HO (2) are heterometallic, neutral one-dimensional (1D) coordination polymers in which the carboxylate-coordinated 3d block metal cation is either decorating only (1) or participates in polymer building (2). Read More

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http://dx.doi.org/10.1021/acs.inorgchem.9b00804DOI Listing

Comparing the Ligand Behavior of N-Heterocyclic Phosphenium and Nitrosyl Units in Iron and Chromium Complexes.

Inorg Chem 2019 Apr 24. Epub 2019 Apr 24.

Institute for Inorganic Chemistry , University of Stuttgart , Pfaffenwaldring 55 , 70550 Stuttgart , Germany.

N-Heterocyclic phosphenium (NHP) and nitrosonium (NO) ligands are often viewed as isolobal analogues that share the capability to switch between different charge states and thus display redox "noninnocent" behavior. We report here on mixed complexes [(NHP)M(CO) (NO)] (M = Fe, Cr; n = 2, 3), which permit evaluating the donor/acceptor properties of both types of ligands and their interplay in a single complex. The crystalline target compounds were obtained from reactions of N-heterocyclic phosphenium triflates with PPN[Fe(CO)(NO)] or PPN[Cr(CO)(NO)], respectively, and fully characterized (PPN = nitride-bistriphenylphosphonium cation). Read More

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http://dx.doi.org/10.1021/acs.inorgchem.9b00737DOI Listing

Synthesis, Crystal Structures, and Photochemical Properties of a Family of Heterometallic Titanium Oxo Clusters.

Inorg Chem 2019 Apr 24. Epub 2019 Apr 24.

State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , China.

The incorporation of heterometallic atoms into the structure of titanium-oxygen nanomaterials is one of the known and effective strategies to develop new high-performance photovoltaic active materials. In this study, we have synthesized three benzoic acid-stabilized heterometallic titanium oxo clusters with the different transition metals Co, Cu, and Cd, formulated as [TiCo(μ-O)(μ-O)(CHCOO)(CHCN)]·2CHCN (1), [TiCu(μ-O)(CHCOO)] (2), and [TiCd(μ-O)(μ-O)(μ-O)(CHCOO)(CHCOOH)(CHCN)]·CHCN·CHCOOH (3), and then we characterized their structures. UV-vis spectroscopy analysis revealed an enhanced UV-vis-light absorption of those heterometallic clusters. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.9b00508DOI Listing

Temperature-controlled orientation of proteins on temperature-responsive grafted polymer brushes. Poly(butyl methacrylate) versus poly(butyl acrylate): Morphology, wetting and protein adsorption.

Biomacromolecules 2019 Apr 24. Epub 2019 Apr 24.

The poly(n-butyl methacrylate) - (PBMA) or poly(n-butyl acrylate) - (PBA) grafted brush coatings attached to glass were successfully prepared using ATR polymerization "from the surface." The thicknesses and composition of the PBMA and PBA coatings were examined using ellipsometry and ToF-SIMS, respectively. For PBMA the glass transition temperature constitutes a range close to the physiological, this being in contrast to PBA where the glass transition temperature is around -55˚C. Read More

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http://pubs.acs.org/doi/10.1021/acs.biomac.9b00030
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http://dx.doi.org/10.1021/acs.biomac.9b00030DOI Listing
April 2019
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11/15/17 Complexes as Molecular Models for Metal Halide Double Perovskite Materials.

Inorg Chem 2019 Apr 24. Epub 2019 Apr 24.

Department of Chemistry and Material Sciences Center , Philipps-Universität Marburg , Hans-Meerwein-Straße , 35043 Marburg , Germany.

Thirteen neutral complexes [E M X (PPh) (L) ] (E = Bi, Sb; M = Cu, Ag; X = Cl, Br, I; L = solvent) featuring three different motifs were prepared and characterized regarding their structure, stability, and absorption spectra. While not identical in structural motif, the compounds can serve as models for the influence of the composition E/M/X on the optical properties of double perovskites AEMX (A = Cs, CHNH). Read More

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http://pubs.acs.org/doi/10.1021/acs.inorgchem.9b00429
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http://dx.doi.org/10.1021/acs.inorgchem.9b00429DOI Listing
April 2019
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Behavior of the Chiral Herbicide Imazamox in Soils: pH-Dependent, Enantioselective Degradation, Formation and Degradation of Several Chiral Metabolites.

Environ Sci Technol 2019 Apr 24. Epub 2019 Apr 24.

Many pesticides show a pronounced bi-phasic degradation in soil, typically with a faster initial phase, followed by a slower decline. For chiral compounds, a bi-phasic decline of the total concentration may result from enantioselective degradation. In this study with the chiral herbicide imazamox, bi-phasic degradation was observed in most of the eighteen soils investigated. Read More

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http://dx.doi.org/10.1021/acs.est.8b07209DOI Listing

Plasmonic Metal Nanoparticles with Core-Bishell Structure for High-Performance Organic and Perovskite Solar Cells.

ACS Nano 2019 Apr 24. Epub 2019 Apr 24.

To maximize light coupling into the active layer, plasmonic nanostructures have been incorporated into both activelayers of organic solar cells (OSCs) and perovskite solar cells (PSCs) with the aim of increasing light absorption, but reports have shown controversial results in electrical characteristics. In this work, we introduce a core-bishell concept to build plasmonic nanoparticles (NPs) with metal-inorganic semiconductor-organic semiconductor nanostructure. Specifically, Ag NPs were decorated with titania/benzoic-acid-fullerene bishell (Ag@TiO2@Pa), which enables the NPs possess nature compatibility with fullerene acceptors or perovskite absorber. Read More

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http://dx.doi.org/10.1021/acsnano.9b00135DOI Listing
April 2019
3 Reads

Binary Assembly of PbS and Au Nanocrystals: Patchy PbS Surface Ligand Coverage Stabilizes the CuAu Superlattice.

ACS Nano 2019 Apr 24. Epub 2019 Apr 24.

Self-assembly of two sizes of nearly-spherical colloidal nanocrystals (NCs) capped with hydrocarbon surface ligands has been shown to produce more than twenty distinct phases of binary nanocrystal superlattices (BNSLs). Such structural diversity, in striking contrast to binary systems of micron-sized colloidal beads, cannot be rationalized by models assuming entropy-driven crystallization of simple spheres. In this work, we show that the PbS ligand binding equilibrium controls the relative stability of two closely related BNSL structures featuring alternating layers of PbS and Au NCs. Read More

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http://dx.doi.org/10.1021/acsnano.9b00006DOI Listing

Confining an Ag10 Core in an Ag12 Shell: A Four-Electron Superatom with Enhanced Photoluminescence upon Crystallization.

ACS Nano 2019 Apr 24. Epub 2019 Apr 24.

We introduce a cluster co-protected by thiol and diphosphine ligands, [Ag22(dppe)4(2,5-DMBT)12Cl4]2+ (dppe=1,2-bis(diphenylphosphino)ethane; 2,5-DMBT= 2,5-dimethylbenzenethiol) which has an Ag10 core, encapsulated by an Ag12(dppe)4(2,5-DMBT)12Cl4 shell. The Ag10 core comprises of two Ag5 distorted trigonal bipyramidal units and is uncommon in Au and Ag nanoclusters. Electrospray ionization mass spectrum reveals that the cluster is divalent and it contains four free electrons. Read More

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http://dx.doi.org/10.1021/acsnano.9b01189DOI Listing

Silver Nanoparticle-doped 3D Porous Carbon Nanofibers as Separator Coating for Stable Lithium Metal Anodes.

ACS Appl Mater Interfaces 2019 Apr 24. Epub 2019 Apr 24.

The ever-increasing demand for electric devices and vehicles prompts the fast development of energy storage systems. Lithium metal is thought to be the most promising electrode for high performance batteries. However, the growth of lithium dendrites impedes the industrial production of lithium metal batteries. Read More

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http://dx.doi.org/10.1021/acsami.9b04122DOI Listing

Pharmacological modulation of the spatiotemporal disposition of micromotions in the intact resting urinary bladder of the rabbit; their pattern is under both myogenic and autonomic control.

BJU Int 2019 Apr 24. Epub 2019 Apr 24.

Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand.

Objectives: To explore and characterize the disposition and dynamics of micromotions in the wall of the intact resting teradotoxinized urinary bladder of the rabbit before and after the administration of adrenergic and cholinergic pharmaceutical agents.

Methods: Spatiotemporal maps and related intravesical pressure were used to analyse propagating patches of contractions (PPCs) and their component individual myogenic contractions [propagating individual contractions (PICs)] in the wall of the tetradotoxinized urinary bladder.

Results: The bladder wall exhibited two contractile states that were of similar frequencies to those of the two types of electrophysiological discharge described in previous studies; the first, in which cyclic PPCs predominated, the second in which small irregular PICs predominated. Read More

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http://dx.doi.org/10.1111/bju.14715DOI Listing

Biochemical and structural characterization of XoxG and XoxJ and their roles in activity of the lanthanide-dependent methanol dehydrogenase, XoxF.

Chembiochem 2019 Apr 24. Epub 2019 Apr 24.

Pennsylvania State University, Chemistry, 220 Chemistry Building, Penn State University, 16802, University Park, UNITED STATES.

Lanthanide (Ln)-dependent methanol dehydrogenases (MDHs) have been recently shown to be widespread in methylotrophic bacteria. Along with the core MDH protein, XoxF, these systems comprise two other proteins, XoxG (a c-type cytochrome) and XoxJ (a periplasmic binding protein of unknown function), about which little is known. Here, we biochemically and structurally characterize these proteins from the methyltroph, Methylobacterium extorquens AM1. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/cbic.2019001
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http://dx.doi.org/10.1002/cbic.201900184DOI Listing
April 2019
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Systematic experimental study on quantum sieving of hydrogen isotopes in metal-amide-imidazolate frameworks with narrow 1-D channels.

Chemphyschem 2019 Apr 24. Epub 2019 Apr 24.

Max-Planck-Institut fur Intelligente Systeme, Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569, Stuttgart, GERMANY.

Quantum sieving of hydrogen isotopes is experimentally studied in isostructural hexagonal metal-organic frameworks having 1-D channels, named IFP-1, -3, -4 and -7. Inside the channels different molecules or atoms restrict the channel diameter periodically with apertures larger (4.2 Å for IFP-1, 3. Read More

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http://dx.doi.org/10.1002/cphc.201900183DOI Listing

Phase transitions in (C H N ) [SnCl ]Cl ·1.5H O crystal, studied by NMR and infrared spectroscopy.

Magn Reson Chem 2019 Apr 24. Epub 2019 Apr 24.

Laboratory of spectroscopic characterization and optics of materials, BP1171, 3018, Sfax, Tunisia.

The (C H N ) [SnCl ]Cl ·1.5H O complex is a new member of the family of hybrid organic-inorganic perovskite compounds. It exhibits two order-disorder phase transitions with changes in the conformation of aromatic cations at the two transition temperatures 360K and 412K. Read More

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http://dx.doi.org/10.1002/mrc.4878DOI Listing

Effect of recreational-fisheries management on fish biodiversity in gravel pit lakes, with contrasts to unmanaged lakes.

J Fish Biol 2019 Apr 24. Epub 2019 Apr 24.

Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin, Germany.

We sampled 23 small (< 20 ha) gravel-pit lakes (16 managed and 7 unmanaged) in north-western Germany using littoral electrofishing and multimesh gillnets. Our objective was to compare the fish biodiversity in gravel pit lakes in the presence or absence of recreational fisheries. Given the size of the sampled lakes, we expected species poor communities and elevated fish diversity in the managed systems due to regular stocking of game fish species. Read More

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http://dx.doi.org/10.1111/jfb.13989DOI Listing

Amphipol-assisted purification method for the highly active and stable photosystem II supercomplex of Chlamydomonas reinhardtii.

FEBS Lett 2019 Apr 24. Epub 2019 Apr 24.

Division of Environmental Photobiology, National Institute for Basic Biology, Nishigo-naka 38, Myodaiji, Okazaki, 444-8585, Japan.

Photosystem II (PSII) splits water and drives electron transfer to plastoquinone via photochemical reactions using light energy. It is surrounded by light-harvesting complex II (LHCII) to form the PSII-LHCII supercomplex. Complete characterization of its structure and function has, however, been hampered due to instability of the complex in the presence of detergent. Read More

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http://dx.doi.org/10.1002/1873-3468.13394DOI Listing

Instability of Incompatible Bilayered Soft Tissues and the Role of Interface Conditions.

J Biomech Eng 2019 Apr 24. Epub 2019 Apr 24.

Faculty of Aerospace Engineering, Technion|Israel Institute of Technology.

Mechanical stability analysis is instructive in explaining biological processes like morphogenesis, organogenesis, and pathogenesis of soft tissues. Consideration of the layered, residually-stressed structure of tissues, requires accounting for the joint effects of interface conditions and layer incompatibility. This paper is concerned with the influence of imposed rate (incremental) interface conditions (RICs) on critical loads in soft tissues, within the context of linear bifurcation analysis. Read More

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http://dx.doi.org/10.1115/1.4043560DOI Listing

Personalized Design of Functional Gradient Bone Tissue Engineering Scaffold.

J Biomech Eng 2019 Apr 24. Epub 2019 Apr 24.

College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, Jiangsu Province, People's Republic of China.

The porous structure of the natural bone not only has the characteristics of lightweight and high strength, but also is conducive to the growth of cells and tissues due to interconnected pores. In this paper, a novel gradient-controlled parametric modeling technology is presented to design bone tissue engineering (BTE) scaffold. First of all, the method functionalizes the pore distribution in the bone tissue, and reconstructs the pore distribution of the bone tissue in combination with the pathological analysis of the bone defect area of the individual patient. Read More

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http://dx.doi.org/10.1115/1.4043559DOI Listing

Application of Pectin from Aloe arborescens Mill. to the Cryopreservation of Human Leukocyte Cell Suspensions.

Cryo Letters 2019 Mar/Apr;40(2):71-76

Physiology Institute at the Komi Scientific Center of the Russian Academy of Sciences, Komi Republic, Syktyvkar, Russian Federation.

Background: The molecular weight (MW) of pectic polysaccharide АА3 equal to 150 kDa and its structure suggest that it has a non-permeating protector action.

Objective: To study the ability of low methylesterified galacturonan АА3, extracted from Aloe arborescens Mill., to influence the cryoprotective properties of the refrigerant in the cryopreservation of leukocytes (-20°С, -80°С). Read More

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Evaluating the Effects of Various Decalcification Protocols on Immunohistochemical Staining in Zebrafish ().

Zebrafish 2019 Apr 24. Epub 2019 Apr 24.

1 Department of Biomedical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, Oregon.

Fixation and decalcification can alter protein structure in tissues, influencing the efficacy of primary antibodies routinely used in immunohistochemical (IHC) staining. Histologic examination of zebrafish requires both processes, making staining and analysis potentially challenging. Here, we investigated the effects of common fixation and decalcification protocols on IHC staining in zebrafish. Read More

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http://dx.doi.org/10.1089/zeb.2018.1697DOI Listing
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