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  • Chemistry  (264)
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  • 1
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-08
    Description: Separation and purification are critical industrial processes for separating components of chemical mixtures, and these processes account for about half of industrial energy usage (1). Gas mixtures of compounds with very similar physical properties are particularly difficult to separate. On pages 137 and 141 of this issue, Cadiau et al. (2) and Cui et al. (3), respectively, show that microporous materials can be designed to have high adsorption capacity and selectivity for particular hydrocarbons, enabling energy-efficient separation. Author: Jerry Y. S. Lin
    Keywords: Chemistry
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  • 2
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-27
    Description: Biomass-degrading microorganisms use lytic polysaccharide monooxygenase (LPMO) enzymes to help digest cellulose, chitin, and starch. By cleaving otherwise inaccessible crystalline cellulose chains, these enzymes provide access to hydrolytic enzymes. LPMOs are of interest to biotechnology because efficient depolymerization of cellulose is a major bottleneck for the production of biologically based chemicals and fuels. On page 1098 of this issue, Kracher et al. (1) compare LPMO-reducing substrates in fungi from different taxonomic groups and lifestyles, based on both biochemical and genomic evidence. The results provide insights into reductive activation of LPMO that are important for developing more efficient industrial enzymes for lignocellulose biorefineries. Author: Angel T. Martínez
    Keywords: Chemistry
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  • 3
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-25
    Description: Author: Marc S. Lavine
    Keywords: Chemistry
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  • 4
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-02-16
    Keywords: Chemistry
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  • 5
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-02-16
    Description: The comment and response concerning the report of oxidation of methane to methanol by water (Reports, 5 May 2017, p. 523) do not fully capture the implications of thermodynamic limitations. A nonisothermal process in which each cycle requires a large temperature swing and permits only substoichiometric methane conversion surely could not be carried out on any practical scale.
    Keywords: Chemistry
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  • 6
    Publication Date: 2018-02-16
    Description: Labinger argues that stepwise reaction of methane with water to produce methanol and hydrogen will never be commercially feasible because of its substoichiometric basis with respect to the active site and the requirement of a large temperature swing. This comment is not touching any new ground, beyond describing the thermodynamic feasibility, thermal cycling, and the role of water as discussed previously. Most important, it does not have a solid numerical basis.
    Keywords: Chemistry
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  • 7
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-07-27
    Keywords: Chemistry
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  • 8
    Publication Date: 2018-07-27
    Description: Vinyl carbocations have been the subject of extensive experimental and theoretical studies over the past five decades. Despite this long history in chemistry, the utility of vinyl cations in chemical synthesis has been limited, with most reactivity studies focusing on solvolysis reactions or intramolecular processes. Here we report synthetic and mechanistic studies of vinyl cations generated through silylium–weakly coordinating anion catalysis. We find that these reactive intermediates undergo mild intermolecular carbon-carbon bond–forming reactions, including carbon-hydrogen (C–H) insertion into unactivated sp 3 C–H bonds and reductive Friedel-Crafts reactions with arenes. Moreover, we conducted computational studies of these alkane C–H functionalization reactions and discovered that they proceed through nonclassical, ambimodal transition structures. This reaction manifold provides a framework for the catalytic functionalization of hydrocarbons using simple ketone derivatives.
    Keywords: Chemistry
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  • 9
    Publication Date: 2018-06-22
    Description: It is commonly assumed that recognition and discrimination of chirality, both in nature and in artificial systems, depend solely on spatial effects. However, recent studies have suggested that charge redistribution in chiral molecules manifests an enantiospecific preference in electron spin orientation. We therefore reasoned that the induced spin polarization may affect enantiorecognition through exchange interactions. Here we show experimentally that the interaction of chiral molecules with a perpendicularly magnetized substrate is enantiospecific. Thus, one enantiomer adsorbs preferentially when the magnetic dipole is pointing up, whereas the other adsorbs faster for the opposite alignment of the magnetization. The interaction is not controlled by the magnetic field per se, but rather by the electron spin orientations, and opens prospects for a distinct approach to enantiomeric separations.
    Keywords: Chemistry
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  • 10
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-06-29
    Keywords: Chemistry
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  • 11
    Publication Date: 2018-12-14
    Description: Theory has established the importance of geometric phase (GP) effects in the adiabatic dynamics of molecular systems with a conical intersection connecting the ground- and excited-state potential energy surfaces, but direct observation of their manifestation in chemical reactions remains a major challenge. Here, we report a high-resolution crossed molecular beams study of the H + HD -〉 H 2 + D reaction at a collision energy slightly above the conical intersection. Velocity map ion imaging revealed fast angular oscillations in product quantum state–resolved differential cross sections in the forward scattering direction for H 2 products at specific rovibrational levels. The experimental results agree with adiabatic quantum dynamical calculations only when the GP effect is included.
    Keywords: Chemistry
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  • 12
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-17
    Keywords: Chemistry
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  • 13
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-17
    Keywords: Chemistry
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  • 14
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-17
    Description: The chemistry of the carbonyl group is essential to modern organic synthesis. The preparation of substituted, enantioenriched 1,3- or 1,5-dicarbonyls is well developed, as their disconnection naturally follows from the intrinsic polarity of the carbonyl group. By contrast, a general enantioselective access to quaternary stereocenters in acyclic 1,4-dicarbonyl systems remains an unresolved problem, despite the tremendous importance of 2,3-substituted 1,4-dicarbonyl motifs in natural products and drug scaffolds. Here we present a broad enantioselective and stereodivergent strategy to access acyclic, polysubstituted 1,4-dicarbonyls via acid-catalyzed [3,3]-sulfonium rearrangement starting from vinyl sulfoxides and ynamides. The stereochemistry at sulfur governs the absolute sense of chiral induction, whereas the double bond geometry dictates the relative configuration of the final products.
    Keywords: Chemistry
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  • 15
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-17
    Keywords: Chemistry
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  • 16
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-17
    Description: With the recent soaring production of natural gas, the use of methane and other light hydrocarbon feedstocks as starting materials in synthetic transformations is becoming increasingly economically attractive, although it remains chemically challenging. We report the development of photocatalytic C–H amination, alkylation, and arylation of methane, ethane, and higher alkanes under visible light irradiation at ambient temperature. High catalytic efficiency (turnover numbers up to 2900 for methane and 9700 for ethane) and selectivity were achieved using abundant, inexpensive cerium salts as photocatalysts. Ligand-to-metal charge transfer excitation generated alkoxy radicals from simple alcohols that in turn acted as hydrogen atom transfer catalysts. The mixed-phase gas/liquid reaction was adapted to continuous flow, enabling the efficient use of gaseous feedstocks in scalable photocatalytic transformations.
    Keywords: Chemistry
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  • 17
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-24
    Keywords: Chemistry
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  • 18
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-24
    Keywords: Chemistry
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  • 19
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-31
    Keywords: Chemistry
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  • 20
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-31
    Description: Intrigued by the potential of nanoscale machines, scientists have long attempted to control molecular motion. We monitored the individual 0.7-nanometer steps of a single molecular hopper as it moved in an electric field along a track in a nanopore controlled by a chemical ratchet. The hopper demonstrated characteristics desired in a moving molecule: defined start and end points, processivity, no chemical fuel requirement, directional motion, and external control. The hopper was readily functionalized to carry cargos. For example, a DNA molecule could be ratcheted along the track in either direction, a prerequisite for nanopore sequencing.
    Keywords: Chemistry
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  • 21
    Publication Date: 2018-09-21
    Description: Phosphorothioate nucleotides have emerged as powerful pharmacological substitutes of their native phosphodiester analogs with important translational applications in antisense oligonucleotide (ASO) therapeutics and cyclic dinucleotide (CDN) synthesis. Stereocontrolled installation of this chiral motif has long been hampered by the systemic use of phosphorus(III) [P(III)]–based reagent systems as the sole practical means of oligonucleotide assembly. A fundamentally different approach is described herein: the invention of a P(V)-based reagent platform for programmable, traceless, diastereoselective phosphorus-sulfur incorporation. The power of this reagent system is demonstrated through the robust and stereocontrolled synthesis of various nucleotidic architectures, including ASOs and CDNs, via an efficient, inexpensive, and operationally simple protocol.
    Keywords: Chemistry
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  • 22
    Publication Date: 2018-09-21
    Description: Here we report an anomalous porous molecular crystal built of C–H···N-bonded double-layered roof-floor components and wall components of a segregatively interdigitated architecture. This complicated porous structure consists of only one type of fully aromatic multijoint molecule carrying three identical dipyridylphenyl wedges. Despite its high symmetry, this molecule accomplishes difficult tasks by using two of its three wedges for roof-floor formation and using its other wedge for wall formation. Although a C–H···N bond is extremely labile, the porous crystal maintains its porosity until thermal breakdown of the C–H···N bonds at 202°C occurs, affording a nonporous polymorph. Though this nonporous crystal survives even at 325°C, it can retrieve the parent porosity under acetonitrile vapor. These findings show how one can translate simplicity into ultrahigh complexity.
    Keywords: Chemistry
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  • 23
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-09-28
    Keywords: Chemistry
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  • 24
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-09-28
    Keywords: Chemistry
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  • 25
    Publication Date: 2018-09-28
    Description: Some of the simplest and most powerful carbon-carbon bond forming strategies take advantage of readily accessible ubiquitous motifs: carbonyls and olefins. Here we report a fundamentally distinct mode of reactivity between carbonyls and olefins that differs from established acid-catalyzed carbonyl-ene, Prins, and carbonyl-olefin metathesis reaction paths. A range of epsilon, zeta-unsaturated ketones undergo Brønsted acid–catalyzed intramolecular cyclization to provide tetrahydrofluorene products via the formation of two new carbon-carbon bonds. Theoretical calculations and accompanying mechanistic studies suggest that this carbocyclization reaction proceeds through the intermediacy of a transient oxetane formed by oxygen atom transfer. The complex polycyclic frameworks in this product class appear as common substructures in organic materials, bioactive natural products, and recently developed pharmaceuticals.
    Keywords: Chemistry
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  • 26
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-09-28
    Description: Alkene aminoarylation with a single, bifunctional reagent is a concise synthetic strategy. We report a catalytic protocol for the addition of arylsulfonylacetamides across electron-rich alkenes with complete anti-Markovnikov regioselectivity and excellent diastereoselectivity to provide 2,2-diarylethylamines. In this process, single-electron alkene oxidation enables carbon-nitrogen bond formation to provide a key benzylic radical poised for a Smiles-Truce 1,5-aryl shift. This reaction is redox-neutral, exhibits broad functional group compatibility, and occurs at room temperature with loss of sulfur dioxide. As this process is driven by visible light, uses readily available starting materials, and demonstrates convergent synthesis, it is well suited for use in a variety of synthetic endeavors.
    Keywords: Chemistry
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  • 27
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-05
    Keywords: Chemistry
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  • 28
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-05
    Keywords: Chemistry
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  • 29
    Publication Date: 2018-10-05
    Description: Photocatalysis based on optically active, "plasmonic" metal nanoparticles has emerged as a promising approach to facilitate light-driven chemical conversions under far milder conditions than thermal catalysis. However, an understanding of the relation between thermal and electronic excitations has been lacking. We report the substantial light-induced reduction of the thermal activation barrier for ammonia decomposition on a plasmonic photocatalyst. We introduce the concept of a light-dependent activation barrier to account for the effect of light illumination on electronic and thermal excitations in a single unified picture. This framework provides insight into the specific role of hot carriers in plasmon-mediated photochemistry, which is critically important for designing energy-efficient plasmonic photocatalysts.
    Keywords: Chemistry
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  • 30
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-12
    Keywords: Chemistry
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  • 31
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-12
    Keywords: Chemistry
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  • 32
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-12
    Description: Single-electron reduction of a carbonyl to a ketyl enables access to a polarity-reversed platform of reactivity for this cornerstone functional group. However, the synthetic utility of the ketyl radical is hindered by the strong reductants necessary for its generation, which also limit its reactivity to net reductive mechanisms. We report a strategy for net redox-neutral generation and reaction of ketyl radicals. The in situ conversion of aldehydes to α-acetoxy iodides lowers their reduction potential by more than 1 volt, allowing for milder access to the corresponding ketyl radicals and an oxidative termination event. Upon subjecting these iodides to a dimanganese decacarbonyl precatalyst and visible light irradiation, an atom transfer radical addition (ATRA) mechanism affords a broad scope of vinyl iodide products with high Z -selectivity.
    Keywords: Chemistry
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  • 33
    Publication Date: 2018-10-12
    Description: Reactions that form a product with the same reactive functionality as that of one of the starting compounds frequently end in oligomerization. As a salient example, selective aldol coupling of the smallest, though arguably most useful, enolizable aldehyde, acetaldehyde, with just one partner substrate has proven to be extremely challenging. Here, we report a highly enantioselective Mukaiyama aldol reaction with the simple triethylsilyl (TES) and tert -butyldimethylsilyl (TBS) enolates of acetaldehyde and various aliphatic and aromatic acceptor aldehydes. The reaction is catalyzed by recently developed, strongly acidic imidodiphosphorimidates (IDPi), which, like enzymes, display a confined active site but, like small-molecule catalysts, have a broad substrate scope. The process is scalable, fast, efficient (0.5 to 1.5 mole % catalyst loading), and greatly simplifies access to highly valuable silylated acetaldehyde aldols.
    Keywords: Chemistry
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  • 34
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-12-21
    Keywords: Chemistry
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  • 35
    Publication Date: 2018-12-21
    Description: Single-molecule magnets (SMMs) containing only one metal center may represent the lower size limit for molecule-based magnetic information storage materials. Their current drawback is that all SMMs require liquid-helium cooling to show magnetic memory effects. We now report a chemical strategy to access the dysprosium metallocene cation [(Cp i Pr5 )Dy(Cp*)] + (Cp i Pr5 , penta-iso-propylcyclopentadienyl; Cp *, pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of U eff = 1541 wave number is also measured. The magnetic blocking temperature of T B = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.
    Keywords: Chemistry
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  • 36
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-29
    Description: Author: Jake Yeston
    Keywords: Chemistry
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  • 37
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: Author: Marc S. Lavine
    Keywords: Chemistry
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  • 38
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: Water plays a central role in scientific disciplines ranging from geology to astronomy to biology. Yet it is an extraordinarily dif cult liquid to understand because of its complex, ever-changing patterns of hydrogen bonds. Studies of small water clusters have provided important insights into the concerted hydrogen-bond motions that can occur in water. These studies are also crucial for developing an accurate potential function for simulating the properties of liquid water and ice (1). On page 1310 of this issue, Richardson et al. (2) provide evidence for a concerted type of motion in which two hydrogen bonds in a water cluster are broken simultaneously (see the figure). The results have implications for many areas of scientific study, including the chemistry of polar solvents, the conformations of proteins, and the dissolution of ions in minerals. Author: David C. Clary
    Keywords: Chemistry
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  • 39
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: Author: Jake Yeston
    Keywords: Chemistry
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  • 40
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-04
    Description: Lower olefins, particularly ethylene (C2H4), propylene (C3H6), and butylene (C4H8), are important intermediates in the manufacture of products such as plastics, solvents, paints, and medicines. They are produced worldwide in amounts exceeding 200 million tons per year (see the photo) (1), mostly from crude oil. More recent approaches use methanol or synthesis gas (syngas; a mixture of carbon monoxide and hydrogen) as feedstocks, but capital investments are high and/or selectivities to lower olefins limited. A bifunctional catalyst reported by Jiao et al. on page 1065 of this issue (2) enables the direct conversion of synthesis gas to lower olefins with a surprisingly high selectivity. Author: Krijn P. de Jong
    Keywords: Chemistry
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  • 41
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-19
    Keywords: Chemistry
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  • 42
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-19
    Description: The development of highly reactive and stereoselective catalytic systems is required not only to improve existing synthetic methods but also to invent distinct chemical reactions. Herein, a homogenized combination of nickel-based Lewis acid–surfactant-combined catalysts and single-walled carbon nanotubes is shown to exhibit substantial activity in water. In addition to the enhanced reactivity, stereoselective performance and long-term stability were demonstrated in asymmetric conjugate addition reactions of aldoximes to furnish chiral nitrones in high yields with excellent selectivities. The practical and straightforward application of the designed catalysts in water provides an expedient, environmentally benign, and highly efficient pathway to access optically active compounds.
    Keywords: Chemistry
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  • 43
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-11-02
    Keywords: Chemistry
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  • 44
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-12-14
    Keywords: Chemistry
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  • 45
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-10-26
    Keywords: Chemistry
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  • 46
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-11-02
    Description: Exploration of intermediates that enable chemoselective cycloaddition reactions and expeditious construction of fused- or bridged-ring systems is a continuous challenge for organic synthesis. As an intermediate of interest, the oxyallyl cation has been harnessed to synthesize architectures containing seven-membered rings via (4+3) cycloaddition. However, its potential to access five-membered skeletons is underdeveloped, largely due to the thermally forbidden (3+2) pathway. Here, the combination of a tailored precursor and a Pd(0) catalyst generates a Pd-oxyallyl intermediate that cyclizes with conjugated dienes to produce a diverse array of tetrahydrofuran skeletons. The cycloaddition overrides conventional (4+3) selectivity by proceeding through a stepwise pathway involving a Pd-allyl transfer and ring closure sequence. Subsequent treatment of the (3+2) adducts with a palladium catalyst converts the heterocycles to the carbocyclic cyclopentanones.
    Keywords: Chemistry
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  • 47
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-11-16
    Keywords: Chemistry
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  • 48
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-10
    Keywords: Chemistry
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  • 49
    Publication Date: 2018-08-10
    Description: Understanding the practical limitations of chemical reactions is critically important for efficiently planning the synthesis of compounds in pharmaceutical, agrochemical, and specialty chemical research and development. However, literature reports of the scope of new reactions are often cursory and biased toward successful results, severely limiting the ability to predict reaction outcomes for untested substrates. We herein illustrate strategies for carrying out large-scale surveys of chemical reactivity by using a material-sparing nanomole-scale automated synthesis platform with greatly expanded synthetic scope combined with ultrahigh-throughput matrix-assisted laser desorption/ionization–time-of-flight mass spectrometry (MALDI-TOF MS).
    Keywords: Chemistry
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  • 50
    Publication Date: 2018-08-24
    Description: Researchers around the world have observed the formation of molecularly ordered structures of unknown origin on the surface of titanium dioxide (TiO 2 ) photocatalysts exposed to air and solution. Using a combination of atomic-scale microscopy and spectroscopy, we show that TiO 2 selectively adsorbs atmospheric carboxylic acids that are typically present in parts-per-billion concentrations while effectively repelling other adsorbates, such as alcohols, that are present in much higher concentrations. The high affinity of the surface for carboxylic acids is attributed to their bidentate binding. These self-assembled monolayers have the unusual property of being both hydrophobic and highly water-soluble, which may contribute to the self-cleaning properties of TiO 2 . This finding is relevant to TiO 2 photocatalysis, because the self-assembled carboxylate monolayers block the undercoordinated surface cation sites typically implicated in photocatalysis.
    Keywords: Chemistry
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  • 51
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-31
    Keywords: Chemistry
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  • 52
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-08-31
    Keywords: Chemistry
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  • 53
    Publication Date: 2018-08-31
    Description: The alkaline earth metals calcium (Ca), strontium (Sr), and barium (Ba) typically engage in chemical bonding as classical main-group elements through their n s and n p valence orbitals, where n is the principal quantum number. Here we report the isolation and spectroscopic characterization of eight-coordinate carbonyl complexes M(CO) 8 (where M = Ca, Sr, or Ba) in a low-temperature neon matrix. Analysis of the electronic structure of these cubic O h -symmetric complexes reveals that the metal–carbon monoxide (CO) bonds arise mainly from [M(d )] -〉 (CO) 8 backdonation, which explains the strong observed red shift of the C-O stretching frequencies. The corresponding radical cation complexes were also prepared in gas phase and characterized by mass-selected infrared photodissociation spectroscopy, confirming adherence to the 18-electron rule more conventionally associated with transition metal chemistry.
    Keywords: Chemistry
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  • 54
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-09-07
    Keywords: Chemistry
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  • 55
    Publication Date: 2018-09-07
    Description: Mystery surrounds the transition from gas-phase hydrocarbon precursors to terrestrial soot and interstellar dust, which are carbonaceous particles formed under similar conditions. Although polycyclic aromatic hydrocarbons (PAHs) are known precursors to high-temperature carbonaceous-particle formation, the molecular pathways that initiate particle formation are unknown. We present experimental and theoretical evidence for rapid molecular clustering–reaction pathways involving radicals with extended conjugation. These radicals react with other hydrocarbon species to form covalently bound complexes that promote further growth and clustering by regenerating resonance-stabilized radicals through low-barrier hydrogen-abstraction and hydrogen-ejection reactions. Such radical–chain reaction pathways may lead to covalently bound clusters of PAHs and other hydrocarbons that would otherwise be too small to condense at high temperatures, thus providing the key mechanistic steps for rapid particle formation and surface growth by hydrocarbon chemisorption.
    Keywords: Chemistry
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  • 56
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-09-14
    Keywords: Chemistry
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  • 57
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-04-27
    Keywords: Chemistry
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  • 58
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-04-27
    Keywords: Chemistry
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  • 59
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-04-27
    Description: Basic heteroarenes are a ubiquitous feature of pharmaceuticals and bioactive molecules, and Minisci-type additions of radical nucleophiles are a leading method for their elaboration. Despite many Minisci-type protocols that result in the formation of stereocenters, exerting control over the absolute stereochemistry at these centers remains an unmet challenge. We report a process for addition of prochiral radicals, generated from amino acid derivatives, to pyridines and quinolines. Our method offers excellent control of both enantioselectivity and regioselectivity. An enantiopure chiral Brønsted acid catalyst serves both to activate the substrate and induce asymmetry, while an iridium photocatalyst mediates the required electron transfer processes. We anticipate that this method will expedite access to enantioenriched small-molecule building blocks bearing versatile basic heterocycles.
    Keywords: Chemistry
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  • 60
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-05-25
    Keywords: Chemistry
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  • 61
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-05-25
    Keywords: Chemistry
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  • 62
    Publication Date: 2018-10-26
    Description: Primary amines are essential constituents of biologically active molecules and versatile intermediates in the synthesis of drugs and agrochemicals. However, their preparation from easily accessible alkenes remains challenging. Here, we report a general strategy to access primary amines from alkenes through an operationally simple iron-catalyzed aminochlorination reaction. A stable hydroxylamine derivative and benign sodium chloride act as the respective nitrogen and chlorine sources. The reaction proceeds at room temperature under air; tolerates a large scope of aliphatic and conjugated alkenes, including densely functionalized substrates; and provides excellent anti-Markovnikov regioselectivity with respect to the amino group. The reactivity of the 2-chloroalkylamine products, an understudied class of amphoteric molecules, enables facile access to linear or branched aliphatic amines, aziridines, aminonitriles, azido amines, and homoallylic amines.
    Keywords: Chemistry
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  • 63
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-11-09
    Keywords: Chemistry
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  • 64
    Publication Date: 2018-11-09
    Description: Despite the enormous potential for the use of stereospecific cross-coupling reactions to rationally manipulate the three-dimensional structure of organic molecules, the factors that control the transfer of stereochemistry in these reactions remain poorly understood. Here we report a mechanistic and synthetic investigation into the use of enantioenriched alkylboron nucleophiles in stereospecific Pd-catalyzed Suzuki cross-coupling reactions. By developing a suite of molecular descriptors of phosphine ligands, we could apply predictive statistical models to select or design distinct ligands that respectively promoted stereoinvertive and stereoretentive cross-coupling reactions. Stereodefined branched structures were thereby accessed through the predictable manipulation of absolute stereochemistry, and a general model for the mechanism of alkylboron transmetallation was proposed.
    Keywords: Chemistry
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  • 65
    Publication Date: 2018-11-16
    Description: Heterobiaryls composed of pyridine and diazine rings are key components of pharmaceuticals and are often central to pharmacological function. We present an alternative approach to metal-catalyzed cross-coupling to make heterobiaryls using contractive phosphorus C–C couplings, also termed phosphorus ligand coupling reactions. The process starts by regioselective phosphorus substitution of the C–H bonds para to nitrogen in two successive heterocycles; ligand coupling is then triggered via acidic alcohol solutions to form the heterobiaryl bond. Mechanistic studies imply that ligand coupling is an asynchronous process involving migration of one heterocycle to the ipso position of the other around a central pentacoordinate P(V) atom. The strategy can be applied to complex drug-like molecules containing multiple reactive sites and polar functional groups, and also enables convergent coupling of drug fragments and late-stage heteroarylation of pharmaceuticals.
    Keywords: Chemistry
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  • 66
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-07-06
    Keywords: Chemistry
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  • 67
    Publication Date: 2018-07-06
    Description: Conical intersections play a critical role in excited-state dynamics of polyatomic molecules because they govern the reaction pathways of many nonadiabatic processes. However, ultrafast probes have lacked sufficient spatial resolution to image wave-packet trajectories through these intersections directly. Here, we present the simultaneous experimental characterization of one-photon and two-photon excitation channels in isolated CF 3 I molecules using ultrafast gas-phase electron diffraction. In the two-photon channel, we have mapped out the real-space trajectories of a coherent nuclear wave packet, which bifurcates onto two potential energy surfaces when passing through a conical intersection. In the one-photon channel, we have resolved excitation of both the umbrella and the breathing vibrational modes in the CF 3 fragment in multiple nuclear dimensions. These findings benchmark and validate ab initio nonadiabatic dynamics calculations.
    Keywords: Chemistry
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  • 68
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-07-13
    Keywords: Chemistry
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  • 69
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-06-22
    Keywords: Chemistry
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  • 70
    Publication Date: 2015-10-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Merrigan, Kathleen -- Griffin, Timothy -- Wilde, Parke -- Robien, Kimberly -- Goldberg, Jeanne -- Dietz, William -- New York, N.Y. -- Science. 2015 Oct 9;350(6257):165-6. doi: 10.1126/science.aab2031. Epub 2015 Oct 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Trachtenberg School of Public Policy and Public Administration, the George Washington University, Washington, DC 20052, USA. kmerrigan@gwu.edu. ; Friedman School of Nutrition Science and Policy, Tufts University, Medford, MA 02155, USA. ; Milken Institute School of Public Health, the George Washington University, Washington, DC 20052, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26429883" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Diet/*standards ; Food Assistance ; Food Technology/*standards ; Humans ; *Nutrition Policy ; United States
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  • 71
    Publication Date: 2015-06-13
    Description: During rest, brain activity is synchronized between different regions widely distributed throughout the brain, forming functional networks. However, the molecular mechanisms supporting functional connectivity remain undefined. We show that functional brain networks defined with resting-state functional magnetic resonance imaging can be recapitulated by using measures of correlated gene expression in a post mortem brain tissue data set. The set of 136 genes we identify is significantly enriched for ion channels. Polymorphisms in this set of genes significantly affect resting-state functional connectivity in a large sample of healthy adolescents. Expression levels of these genes are also significantly associated with axonal connectivity in the mouse. The results provide convergent, multimodal evidence that resting-state functional networks correlate with the orchestrated activity of dozens of genes linked to ion channel activity and synaptic function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Richiardi, Jonas -- Altmann, Andre -- Milazzo, Anna-Clare -- Chang, Catie -- Chakravarty, M Mallar -- Banaschewski, Tobias -- Barker, Gareth J -- Bokde, Arun L W -- Bromberg, Uli -- Buchel, Christian -- Conrod, Patricia -- Fauth-Buhler, Mira -- Flor, Herta -- Frouin, Vincent -- Gallinat, Jurgen -- Garavan, Hugh -- Gowland, Penny -- Heinz, Andreas -- Lemaitre, Herve -- Mann, Karl F -- Martinot, Jean-Luc -- Nees, Frauke -- Paus, Tomas -- Pausova, Zdenka -- Rietschel, Marcella -- Robbins, Trevor W -- Smolka, Michael N -- Spanagel, Rainer -- Strohle, Andreas -- Schumann, Gunter -- Hawrylycz, Mike -- Poline, Jean-Baptiste -- Greicius, Michael D -- IMAGEN consortium -- 93558/Medical Research Council/United Kingdom -- R01 MH085772-01A1/MH/NIMH NIH HHS/ -- R01NS073498/NS/NINDS NIH HHS/ -- U54 EB020403/EB/NIBIB NIH HHS/ -- Department of Health/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2015 Jun 12;348(6240):1241-4. doi: 10.1126/science.1255905. Epub 2015 Jun 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Functional Imaging in Neuropsychiatric Disorders Laboratory, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA. Laboratory of Neurology and Imaging of Cognition, Department of Neuroscience, University of Geneva, Geneva, Switzerland. jonas.richiardi@unige.ch greicius@stanford.edu. ; Functional Imaging in Neuropsychiatric Disorders Laboratory, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA. ; The War Related Illness and Injury Study Center, VA Palo Alto Health Care System, Palo Alto, CA, USA. Functional Imaging in Neuropsychiatric Disorders Laboratory, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA. ; Advanced MRI Section, Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA. ; Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Canada. Departments of Psychiatry and Biomedical Engineering, McGill University, Montreal, Canada. ; Department of Child and Adolescent Psychiatry, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. ; Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK. ; Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland. ; Universitaetsklinikum Hamburg Eppendorf, Hamburg, Germany. ; Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK. Department of Psychiatry, Universite de Montreal, Centre Hospitalier Universitaire (CHU) Ste Justine Hospital, Montreal, Canada. ; Department of Addictive Behaviour and Addiction Medicine, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. ; Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. ; Neurospin, Commissariat a l'Energie Atomique et aux Energies Alternatives, Paris, France. ; Department of Psychiatry and Psychotherapy, Campus Charite Mitte, Charite-Universitatsmedizin Berlin, Berlin, Germany. ; Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland. Departments of Psychiatry and Psychology, University of Vermont, Burlington, VT, USA. ; School of Physics and Astronomy, University of Nottingham, Nottingham, UK. ; Institut National de la Sante et de la Recherche Medicale, INSERM Unit 1000 "Neuroimaging and Psychiatry," University Paris Sud, Orsay, France. INSERM Unit 1000 at Maison de Solenn, Assistance Publique Hopitaux de Paris (APHP), Cochin Hospital, University Paris Descartes, Sorbonne Paris Cite, Paris, France. ; Rotman Research Institute, University of Toronto, Toronto, Canada. School of Psychology, University of Nottingham, Nottingham, UK. ; The Hospital for Sick Children, University of Toronto, Toronto, Canada. ; Department of Genetic Epidemiology in Psychiatry, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. ; Behavioural and Clinical Neuroscience Institute and Department of Psychology, University of Cambridge, Cambridge, UK. ; Department of Psychiatry and Psychotherapy, and Neuroimaging Center, Technische Universitat Dresden, Dresden, Germany. ; Department of Psychopharmacology, Central Institute of Mental Health, Faculty of Clinical Medicine Mannheim, Mannheim, Germany. ; Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK. Medical Research Council (MRC) Social, Genetic and Developmental Psychiatry (SGDP) Centre, London, UK. ; Allen Institute for Brain Science, Seattle, WA, USA. ; Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, USA. ; Functional Imaging in Neuropsychiatric Disorders Laboratory, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA. jonas.richiardi@unige.ch greicius@stanford.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26068849" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Animals ; Brain/metabolism/*physiology ; Female ; Gene Expression ; Humans ; Ion Channels/*genetics ; Magnetic Resonance Imaging ; Male ; Mice ; Nerve Net/metabolism/*physiology ; Neural Pathways/metabolism/physiology ; Polymorphism, Genetic ; Rest/*physiology ; Synapses/metabolism/physiology ; *Transcriptome ; Young Adult
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  • 72
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2015-07-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mervis, Jeffrey -- New York, N.Y. -- Science. 2015 Jul 3;349(6243):16. doi: 10.1126/science.349.6243.16.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26138958" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Age Factors ; Animal Experimentation ; Animals ; *Attitude ; Data Collection ; Female ; Global Warming ; Humans ; Nuclear Energy ; Politics ; *Public Opinion ; *Research ; Sex Factors ; United States
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  • 73
    Publication Date: 2016-01-20
    Description: Massive open online courses (MOOCs) are often characterized as remedies to educational disparities related to social class. Using data from 68 MOOCs offered by Harvard and MIT between 2012 and 2014, we found that course participants from the United States tended to live in more-affluent and better-educated neighborhoods than the average U.S. resident. Among those who did register for courses, students with greater socioeconomic resources were more likely to earn a certificate. Furthermore, these differences in MOOC access and completion were larger for adolescents and young adults, the traditional ages where people find on-ramps into science, technology, engineering, and mathematics (STEM) coursework and careers. Our findings raise concerns that MOOCs and similar approaches to online learning can exacerbate rather than reduce disparities in educational outcomes related to socioeconomic status.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hansen, John D -- Reich, Justin -- New York, N.Y. -- Science. 2015 Dec 4;350(6265):1245-8. doi: 10.1126/science.aab3782. Epub 2015 Dec 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard Graduate School of Education, Harvard University, Cambridge, MA 02138, USA. john_hansen@mail.harvard.edu. ; Office of Digital Learning, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26785488" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Career Choice ; Certification/*methods ; Education, Distance/*methods ; Engineering/education ; Humans ; Internet ; Learning ; Mathematics/education ; *Online Systems ; Science/education ; *Social Class ; Students ; Technology/education ; United States ; Young Adult
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  • 74
    Publication Date: 2015-11-01
    Description: It is unknown whether the human immune system frequently mounts a T cell response against mutations expressed by common epithelial cancers. Using a next-generation sequencing approach combined with high-throughput immunologic screening, we demonstrated that tumor-infiltrating lymphocytes (TILs) from 9 out of 10 patients with metastatic gastrointestinal cancers contained CD4(+) and/or CD8(+) T cells that recognized one to three neo-epitopes derived from somatic mutations expressed by the patient's own tumor. There were no immunogenic epitopes shared between these patients. However, we identified in one patient a human leukocyte antigen-C*08:02-restricted T cell receptor from CD8(+) TILs that targeted the KRAS(G12D) hotspot driver mutation found in many human cancers. Thus, a high frequency of patients with common gastrointestinal cancers harbor immunogenic mutations that can potentially be exploited for the development of highly personalized immunotherapies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tran, Eric -- Ahmadzadeh, Mojgan -- Lu, Yong-Chen -- Gros, Alena -- Turcotte, Simon -- Robbins, Paul F -- Gartner, Jared J -- Zheng, Zhili -- Li, Yong F -- Ray, Satyajit -- Wunderlich, John R -- Somerville, Robert P -- Rosenberg, Steven A -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2015 Dec 11;350(6266):1387-90. doi: 10.1126/science.aad1253. Epub 2015 Oct 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. ; Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. sar@mail.nih.gov.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26516200" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; CD8-Positive T-Lymphocytes/immunology ; Cell Line, Tumor ; Female ; Gastrointestinal Neoplasms/*genetics/*immunology/therapy ; HLA-C Antigens/genetics/immunology ; Humans ; Immunodominant Epitopes/genetics/immunology ; Immunotherapy/methods ; Lymphocytes, Tumor-Infiltrating/immunology ; Male ; Middle Aged ; Mutation ; Precision Medicine/methods ; Proto-Oncogene Proteins/genetics/immunology ; Receptors, Antigen, T-Cell/immunology ; ras Proteins/genetics/immunology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 75
    Publication Date: 2015-09-12
    Description: Monoclonal antibodies directed against cytotoxic T lymphocyte-associated antigen-4 (CTLA-4), such as ipilimumab, yield considerable clinical benefit for patients with metastatic melanoma by inhibiting immune checkpoint activity, but clinical predictors of response to these therapies remain incompletely characterized. To investigate the roles of tumor-specific neoantigens and alterations in the tumor microenvironment in the response to ipilimumab, we analyzed whole exomes from pretreatment melanoma tumor biopsies and matching germline tissue samples from 110 patients. For 40 of these patients, we also obtained and analyzed transcriptome data from the pretreatment tumor samples. Overall mutational load, neoantigen load, and expression of cytolytic markers in the immune microenvironment were significantly associated with clinical benefit. However, no recurrent neoantigen peptide sequences predicted responder patient populations. Thus, detailed integrated molecular characterization of large patient cohorts may be needed to identify robust determinants of response and resistance to immune checkpoint inhibitors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Allen, Eliezer M -- Miao, Diana -- Schilling, Bastian -- Shukla, Sachet A -- Blank, Christian -- Zimmer, Lisa -- Sucker, Antje -- Hillen, Uwe -- Foppen, Marnix H Geukes -- Goldinger, Simone M -- Utikal, Jochen -- Hassel, Jessica C -- Weide, Benjamin -- Kaehler, Katharina C -- Loquai, Carmen -- Mohr, Peter -- Gutzmer, Ralf -- Dummer, Reinhard -- Gabriel, Stacey -- Wu, Catherine J -- Schadendorf, Dirk -- Garraway, Levi A -- U54 HG003067/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2015 Oct 9;350(6257):207-11. doi: 10.1126/science.aad0095. Epub 2015 Sep 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. Center for Cancer Precision Medicine, Dana-Farber Cancer Institute, Boston, MA 02215, USA. ; Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. ; Department of Dermatology, University Hospital, University Duisburg-Essen, 45147 Essen, Germany. German Cancer Consortium(DKTK), 69121 Heidelberg, Germany. ; Department of Medical Oncology, Netherlands Cancer Institute, 1066 CX Amsterdam, Netherlands. ; Department of Dermatology, University Hospital Zurich, 8091 Zurich, Switzerland. ; Skin Cancer Unit, German Cancer Research Center(DKTK), 69121 Heidelberg, Germany. Skin Cancer Unit, German Cancer Research Center(DKTK), 69121 Heidelberg, Germany. Department of Dermatology, Venerology, and Allergology, University Medical Center, Ruprecht-Karls University of Heidelberg, 68167 Mannheim, Germany. ; Department of Dermatology, University Hospital, Ruprecht-Karls University of Heidelberg, 69120 Heidelberg, Germany. ; Department of Dermatology, University Hospital Tubingen, 72076 Tubingen, Germany. ; Department of Dermatology, University Hospital Kiel, 24105 Kiel, Germany. ; Department of Dermatology, University Medical Center, 55131 Mainz, Germany. ; Department of Dermatology, Elbe-Kliniken, 21614 Buxtehude, Germany. ; Department of Dermatology and Allergy, Skin Cancer Center Hannover, Hannover Medical School, 30625 Hannover, Germany. ; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. ; Department of Dermatology, University Hospital, University Duisburg-Essen, 45147 Essen, Germany. German Cancer Consortium(DKTK), 69121 Heidelberg, Germany. levi_garraway@dfci.harvard.edu dirk.schadendorf@uk-essen.de. ; Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. Center for Cancer Precision Medicine, Dana-Farber Cancer Institute, Boston, MA 02215, USA. levi_garraway@dfci.harvard.edu dirk.schadendorf@uk-essen.de.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26359337" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; Aged, 80 and over ; Antibodies, Monoclonal/*pharmacology/therapeutic use ; Antigens, Neoplasm/*genetics ; *Biomarkers, Pharmacological ; CTLA-4 Antigen/*antagonists & inhibitors ; Cell Cycle Checkpoints/genetics/immunology ; Cohort Studies ; DNA Mutational Analysis ; Drug Resistance, Neoplasm/genetics ; Exome ; Female ; Genomics ; HLA Antigens/genetics ; Humans ; Male ; Melanoma/*drug therapy/*genetics/secondary ; Middle Aged ; Mutation ; Skin Neoplasms/*drug therapy/*genetics/pathology ; Tumor Microenvironment/drug effects/immunology ; Young Adult
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 76
    Publication Date: 2015-11-07
    Description: Antibodies targeting CTLA-4 have been successfully used as cancer immunotherapy. We find that the antitumor effects of CTLA-4 blockade depend on distinct Bacteroides species. In mice and patients, T cell responses specific for B. thetaiotaomicron or B. fragilis were associated with the efficacy of CTLA-4 blockade. Tumors in antibiotic-treated or germ-free mice did not respond to CTLA blockade. This defect was overcome by gavage with B. fragilis, by immunization with B. fragilis polysaccharides, or by adoptive transfer of B. fragilis-specific T cells. Fecal microbial transplantation from humans to mice confirmed that treatment of melanoma patients with antibodies against CTLA-4 favored the outgrowth of B. fragilis with anticancer properties. This study reveals a key role for Bacteroidales in the immunostimulatory effects of CTLA-4 blockade.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4721659/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4721659/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vetizou, Marie -- Pitt, Jonathan M -- Daillere, Romain -- Lepage, Patricia -- Waldschmitt, Nadine -- Flament, Caroline -- Rusakiewicz, Sylvie -- Routy, Bertrand -- Roberti, Maria P -- Duong, Connie P M -- Poirier-Colame, Vichnou -- Roux, Antoine -- Becharef, Sonia -- Formenti, Silvia -- Golden, Encouse -- Cording, Sascha -- Eberl, Gerard -- Schlitzer, Andreas -- Ginhoux, Florent -- Mani, Sridhar -- Yamazaki, Takahiro -- Jacquelot, Nicolas -- Enot, David P -- Berard, Marion -- Nigou, Jerome -- Opolon, Paule -- Eggermont, Alexander -- Woerther, Paul-Louis -- Chachaty, Elisabeth -- Chaput, Nathalie -- Robert, Caroline -- Mateus, Christina -- Kroemer, Guido -- Raoult, Didier -- Boneca, Ivo Gomperts -- Carbonnel, Franck -- Chamaillard, Mathias -- Zitvogel, Laurence -- R01 CA161879/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2015 Nov 27;350(6264):1079-84. doi: 10.1126/science.aad1329. Epub 2015 Nov 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. INSERM U1015, GRCC, Villejuif, France. University of Paris Sud XI, Kremlin-Bicetre, France. ; Institut National de la Recherche Agronomique (INRA), Micalis-UMR1319, 78360 Jouy-en-Josas, France. ; University of Lille, CNRS, INSERM, Centre Hospitalier Regional Universitaire de Lille, Institut Pasteur de Lille, U1019, UMR 8204, Centre d'Infection et d'Immunite de Lille (CIIL), F-59000 Lille, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. INSERM U1015, GRCC, Villejuif, France. Center of Clinical Investigations in Biotherapies of Cancer 1428, Villejuif, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. INSERM U1015, GRCC, Villejuif, France. University of Paris Sud XI, Kremlin-Bicetre, France. Center of Clinical Investigations in Biotherapies of Cancer 1428, Villejuif, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. INSERM U1015, GRCC, Villejuif, France. Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. ; Department of Radiation Oncology, New York University, New York, NY, USA. ; Microenvironment and Immunity Unit, Institut Pasteur, Paris, France. ; Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore. ; Department of Genetics and Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. Metabolomics Platform, GRCC, Villejuif, France. ; Animalerie Centrale, Institut Pasteur, Paris, France. ; Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale (IPBS), Toulouse, France. Universite de Toulouse, Universite Paul Sabatier, IPBS, F-31077 Toulouse, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. INSERM U1015, GRCC, Villejuif, France. Department of Medical Oncology, Institut Gustave Roussy, Villejuif, France. ; Service de microbiologie, GRCC, Villejuif, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. Laboratory of Immunomonitoring in Oncology, UMS 3655 CNRS/US 23 INSERM, GRCC, Villejuif, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. Department of Medical Oncology, Institut Gustave Roussy, Villejuif, France. INSERM U981, GRCC, Villejuif, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. Department of Medical Oncology, Institut Gustave Roussy, Villejuif, France. ; Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. Metabolomics Platform, GRCC, Villejuif, France. INSERM U848, Villejuif, France. Equipe 11 Labellisee-Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, INSERM U1138, Paris, France. Pole de Biologie, Hopital Europeen Georges Pompidou, Assistance Publique-Hopitaux de Paris, Paris, France. ; Unite des Rickettsies, Faculte de Medecine, Universite de la Mediterranee, Marseille, France. ; Institut Pasteur, Unit of Biology and Genetics of the Bacterial Cell Wall, Paris, France. INSERM, Equipe Avenir, Paris, France. ; University of Paris Sud XI, Kremlin-Bicetre, France. Gastroenterology Department, Hopital Bicetre, Assistance Publique-Hopitaux de Paris, Paris, France. ; Institut de Cancerologie Gustave Roussy Cancer Campus (GRCC), 114 rue Edouard Vaillant, 94805 Villejuif, France. INSERM U1015, GRCC, Villejuif, France. University of Paris Sud XI, Kremlin-Bicetre, France. Center of Clinical Investigations in Biotherapies of Cancer 1428, Villejuif, France. laurence.zitvogel@gustaveroussy.fr.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26541610" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; Aged, 80 and over ; Animals ; Anti-Bacterial Agents/pharmacology ; Antibodies, Monoclonal/adverse effects/*therapeutic use ; Bacteroides/*immunology ; CTLA-4 Antigen/*antagonists & inhibitors/immunology ; Dysbiosis/immunology ; Fecal Microbiota Transplantation ; Female ; Gastrointestinal Microbiome/drug effects/*immunology ; Germ-Free Life/immunology ; Humans ; Immunologic Memory ; Immunotherapy ; Intestines/immunology/microbiology ; Male ; Melanoma/*therapy ; Mice ; Mice, Inbred C57BL ; Middle Aged ; Skin Neoplasms/*therapy ; T-Lymphocytes/immunology
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  • 77
    Publication Date: 2015-05-30
    Description: Although people may endorse egalitarianism and tolerance, social biases can remain operative and drive harmful actions in an unconscious manner. Here, we investigated training to reduce implicit racial and gender bias. Forty participants processed counterstereotype information paired with one sound for each type of bias. Biases were reduced immediately after training. During subsequent slow-wave sleep, one sound was unobtrusively presented to each participant, repeatedly, to reactivate one type of training. Corresponding bias reductions were fortified in comparison with the social bias not externally reactivated during sleep. This advantage remained 1 week later, the magnitude of which was associated with time in slow-wave and rapid-eye-movement sleep after training. We conclude that memory reactivation during sleep enhances counterstereotype training and that maintaining a bias reduction is sleep-dependent.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4467959/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4467959/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hu, Xiaoqing -- Antony, James W -- Creery, Jessica D -- Vargas, Iliana M -- Bodenhausen, Galen V -- Paller, Ken A -- F31 MH100958/MH/NIMH NIH HHS/ -- F31-MH100958/MH/NIMH NIH HHS/ -- T32 AG020506/AG/NIA NIH HHS/ -- T32-AG020418/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 2015 May 29;348(6238):1013-5. doi: 10.1126/science.aaa3841.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, Northwestern University, Evanston, IL 60208, USA. Department of Psychology, University of Texas at Austin, Austin, TX 78712, USA. ; Department of Psychology, Northwestern University, Evanston, IL 60208, USA. Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA. ; Department of Psychology, Northwestern University, Evanston, IL 60208, USA. ; Department of Psychology, Northwestern University, Evanston, IL 60208, USA. kap@northwestern.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26023137" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; *Cognition ; Continental Population Groups/psychology ; Female ; Humans ; Male ; Memory/*physiology ; Prejudice/*psychology ; Sex Factors ; Sleep, REM/*physiology ; Young Adult
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  • 78
    Publication Date: 2015-09-19
    Description: We studied the distributional preferences of an elite cadre of Yale Law School students, a group that will assume positions of power in U.S. society. Our experimental design allows us to test whether redistributive decisions are consistent with utility maximization and to decompose underlying preferences into two qualitatively different tradeoffs: fair-mindedness versus self-interest, and equality versus efficiency. Yale Law School subjects are more consistent than subjects drawn from the American Life Panel, a diverse sample of Americans. Relative to the American Life Panel, Yale Law School subjects are also less fair-minded and substantially more efficiency-focused. We further show that our measure of equality-efficiency tradeoffs predicts Yale Law School students' career choices: Equality-minded subjects are more likely to be employed at nonprofit organizations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fisman, Raymond -- Jakiela, Pamela -- Kariv, Shachar -- Markovits, Daniel -- New York, N.Y. -- Science. 2015 Sep 18;349(6254):aab0096. doi: 10.1126/science.aab0096.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Economics, Boston University, Boston, MA, USA. rfisman@bu.edu. ; Department of Agricultural and Resource Economics, University of Maryland, College Park, MD, USA. ; Department of Economics, University of California, Berkeley, Berkely, CA, USA. ; Yale Law School, Yale University, New Haven, CT, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26383958" target="_blank"〉PubMed〈/a〉
    Keywords: Administrative Personnel/*psychology ; Adult ; Attitude ; *Career Choice ; Employment ; Female ; Humans ; Jurisprudence ; Organizations, Nonprofit ; *Power (Psychology) ; Public Opinion ; *Resource Allocation ; Social Justice/*psychology ; Students ; United States
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  • 79
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2015-12-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fraser, Barbara -- New York, N.Y. -- Science. 2015 Dec 11;350(6266):1304. doi: 10.1126/science.350.6266.1304.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26659035" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Anthropology ; Brazil ; Child ; *Communicable Disease Control ; Communicable Diseases/*immunology ; Conflict (Psychology) ; *Epidemiological Monitoring ; Health ; Humans ; Immunity ; Male ; *Population Groups ; Rivers ; *Social Isolation
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  • 80
    facet.materialart.
    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 2015-04-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jacobs, Madeleine -- New York, N.Y. -- Science. 2015 Apr 3;348(6230):150. doi: 10.1126/science.348.6230.150.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉A former editor-in-chief of C&EN, Madeleine Jacobs was CEO of ACS until she retired at the end of 2014. For more on life and careers, visit sciencecareers.sciencemag.org. Send your story to SciCareerEditor@aaas.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25838387" target="_blank"〉PubMed〈/a〉
    Keywords: *Career Choice ; Chemistry ; Female ; Humans ; *Journalism ; *Women, Working
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  • 81
    Publication Date: 2015-03-07
    Description: Democracies depend on the support of the general population, but little is known about the determinants of this support. We investigated whether support for democracy increases with the length of time spent under the system and whether preferences are thus affected by the political system. Relying on 380,000 individual-level observations from 104 countries over the years 1994 to 2013, and exploiting individual-level variation within a country and a given year in the length of time spent under democracy, we find evidence that political preferences are endogenous. For new democracies, our findings imply that popular support needs time to develop. For example, the effect of around 8.5 more years of democratic experience corresponds to the difference in support for democracy between primary and secondary education.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fuchs-Schundeln, Nicola -- Schundeln, Matthias -- New York, N.Y. -- Science. 2015 Mar 6;347(6226):1145-8. doi: 10.1126/science.aaa0880.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Goethe University Frankfurt, 60320 Frankfurt, Germany. fuchs@wiwi.uni-frankfurt.de schuendeln@wiwi.uni-frankfurt.de.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25745172" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Child ; *Democracy ; Educational Status ; Female ; Humans ; *Individuality ; Male ; Middle Aged ; *Social Values ; Young Adult
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  • 82
    Publication Date: 2015-02-24
    Description: Amyotrophic lateral sclerosis (ALS) is a devastating neurological disease with no effective treatment. We report the results of a moderate-scale sequencing study aimed at increasing the number of genes known to contribute to predisposition for ALS. We performed whole-exome sequencing of 2869 ALS patients and 6405 controls. Several known ALS genes were found to be associated, and TBK1 (the gene encoding TANK-binding kinase 1) was identified as an ALS gene. TBK1 is known to bind to and phosphorylate a number of proteins involved in innate immunity and autophagy, including optineurin (OPTN) and p62 (SQSTM1/sequestosome), both of which have also been implicated in ALS. These observations reveal a key role of the autophagic pathway in ALS and suggest specific targets for therapeutic intervention.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4437632/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4437632/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cirulli, Elizabeth T -- Lasseigne, Brittany N -- Petrovski, Slave -- Sapp, Peter C -- Dion, Patrick A -- Leblond, Claire S -- Couthouis, Julien -- Lu, Yi-Fan -- Wang, Quanli -- Krueger, Brian J -- Ren, Zhong -- Keebler, Jonathan -- Han, Yujun -- Levy, Shawn E -- Boone, Braden E -- Wimbish, Jack R -- Waite, Lindsay L -- Jones, Angela L -- Carulli, John P -- Day-Williams, Aaron G -- Staropoli, John F -- Xin, Winnie W -- Chesi, Alessandra -- Raphael, Alya R -- McKenna-Yasek, Diane -- Cady, Janet -- Vianney de Jong, J M B -- Kenna, Kevin P -- Smith, Bradley N -- Topp, Simon -- Miller, Jack -- Gkazi, Athina -- FALS Sequencing Consortium -- Al-Chalabi, Ammar -- van den Berg, Leonard H -- Veldink, Jan -- Silani, Vincenzo -- Ticozzi, Nicola -- Shaw, Christopher E -- Baloh, Robert H -- Appel, Stanley -- Simpson, Ericka -- Lagier-Tourenne, Clotilde -- Pulst, Stefan M -- Gibson, Summer -- Trojanowski, John Q -- Elman, Lauren -- McCluskey, Leo -- Grossman, Murray -- Shneider, Neil A -- Chung, Wendy K -- Ravits, John M -- Glass, Jonathan D -- Sims, Katherine B -- Van Deerlin, Vivianna M -- Maniatis, Tom -- Hayes, Sebastian D -- Ordureau, Alban -- Swarup, Sharan -- Landers, John -- Baas, Frank -- Allen, Andrew S -- Bedlack, Richard S -- Harper, J Wade -- Gitler, Aaron D -- Rouleau, Guy A -- Brown, Robert -- Harms, Matthew B -- Cooper, Gregory M -- Harris, Tim -- Myers, Richard M -- Goldstein, David B -- 089701/Wellcome Trust/United Kingdom -- K08 NS075094/NS/NINDS NIH HHS/ -- P01 AG017586/AG/NIA NIH HHS/ -- P01 AG032953/AG/NIA NIH HHS/ -- P50 AG025688/AG/NIA NIH HHS/ -- R37 NS033123/NS/NINDS NIH HHS/ -- R37 NS083524/NS/NINDS NIH HHS/ -- T32 GM007754/GM/NIGMS NIH HHS/ -- TL1 TR001066/TR/NCATS NIH HHS/ -- UL1 TR001067/TR/NCATS NIH HHS/ -- New York, N.Y. -- Science. 2015 Mar 27;347(6229):1436-41. doi: 10.1126/science.aaa3650. Epub 2015 Feb 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Applied Genomics and Precision Medicine, Duke University School of Medicine, Durham, NC 27708, USA. ; HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806, USA. ; Institute for Genomic Medicine, Columbia University, New York, NY 10032, USA. ; Department of Neurology, University of Massachusetts Medical School, Worcester, MA 01655, USA. ; Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec H3A 2B4, Canada. ; Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305, USA. ; Duke University School of Medicine, Durham, NC 27708, USA. ; Biogen Idec, Cambridge, MA 02142, USA. ; Neurogenetics DNA Diagnostic Laboratory, Center for Human Genetics Research, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA. ; Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA. ; Department of Genome Analysis, Academic Medical Center, Meibergdreef 9, 1105AZ Amsterdam, Netherlands. ; Academic Unit of Neurology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Republic of Ireland. ; Department of Basic and Clinical Neuroscience, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London SE5 8AF, UK. ; Department of Neurology, Brain Center Rudolf Magnus, University Medical Centre Utrecht, 3508 GA Utrecht, Netherlands. ; Department of Neurology and Laboratory of Neuroscience, IRCCS Istituto Auxologico Italiano, Milan 20149, Italy, and Department of Pathophysiology and Transplantation, Dino Ferrari Center, Universita degli Studi di Milano, Milan 20122, Italy. ; Cedars Sinai Medical Center, Los Angeles, CA 90048, USA. ; Houston Methodist Hospital, Houston, TX 77030, USA, and Weill Cornell Medical College of Cornell University, New York, NY 10065, USA. ; Ludwig Institute for Cancer Research and Department of Neurosciences, University of California, San Diego, La Jolla, CA 92093, USA. ; Department of Neurology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA. ; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. ; Department of Neurology, Penn ALS Center, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. ; Department of Neurology, Penn Frontotemporal Degeneration Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA. ; Department of Neurology, Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA. ; Department of Pediatrics and Medicine, Columbia University, New York, NY 10032, USA. ; Department of Neurosciences, University of California, San Diego, La Jolla, CA 92093, USA. ; Department of Neurology, Emory University, Atlanta, GA 30322, USA. ; Department of Biochemistry & Molecular Biophysics, Columbia University, New York, NY 10027, USA. ; Biogen Idec, Cambridge, MA 02142, USA. Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA. ; Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA. ; Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, NC 27708, USA. ; Duke ALS Clinic and Durham VA Medical Center, Durham, NC 27708, USA. ; Biogen Idec, Cambridge, MA 02142, USA. tim.harris@biogenidec.com.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25700176" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing/genetics/metabolism ; Adolescent ; Adult ; Aged ; Aged, 80 and over ; Amyotrophic Lateral Sclerosis/*genetics ; Autophagy/*genetics ; Exome/*genetics ; Female ; Genes ; Genetic Association Studies ; *Genetic Predisposition to Disease ; Humans ; Male ; Middle Aged ; Protein Binding ; Protein-Serine-Threonine Kinases/*genetics/metabolism ; Risk ; Sequence Analysis, DNA ; Transcription Factor TFIIIA/genetics/metabolism ; Young Adult
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 83
    Publication Date: 2015-03-15
    Description: Research suggesting that political conservatives are happier than political liberals has relied exclusively on self-report measures of subjective well-being. We show that this finding is fully mediated by conservatives' self-enhancing style of self-report (study 1; N = 1433) and then describe three studies drawing from "big data" sources to assess liberal-conservative differences in happiness-related behavior (studies 2 to 4; N = 4936). Relative to conservatives, liberals more frequently used positive emotional language in their speech and smiled more intensely and genuinely in photographs. Our results were consistent across large samples of online survey takers, U.S. politicians, Twitter users, and LinkedIn users. Our findings illustrate the nuanced relationship between political ideology, self-enhancement, and happiness and illuminate the contradictory ways that happiness differences can manifest across behavior and self-reports.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wojcik, Sean P -- Hovasapian, Arpine -- Graham, Jesse -- Motyl, Matt -- Ditto, Peter H -- New York, N.Y. -- Science. 2015 Mar 13;347(6227):1243-6. doi: 10.1126/science.1260817.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology and Social Behavior, University of California, Irvine, CA 92697, USA. swojcik@uci.edu phditto@uci.edu. ; Department of Psychology and Social Behavior, University of California, Irvine, CA 92697, USA. ; Department of Psychology, University of Southern California, CA 90089, USA. ; University of Illinois, Chicago, IL 60607, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25766233" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Emotions ; Facial Expression ; Female ; *Happiness ; Humans ; Language ; Male ; Middle Aged ; *Politics ; Self Report ; *Self-Assessment ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 84
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2015-02-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jocelyn -- New York, N.Y. -- Science. 2015 Feb 20;347(6224):817. doi: 10.1126/science.347.6224.817.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25700496" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Biomedical Research/economics/*trends ; Child ; Cohort Studies ; *Electronic Health Records ; *Health Records, Personal ; Humans ; National Institutes of Health (U.S.) ; Precision Medicine/economics/*trends ; Research Design ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 85
    Publication Date: 2016-02-27
    Description: Ebola virus disease in humans is highly lethal, with case fatality rates ranging from 25 to 90%. There is no licensed treatment or vaccine against the virus, underscoring the need for efficacious countermeasures. We ascertained that a human survivor of the 1995 Kikwit Ebola virus disease outbreak maintained circulating antibodies against the Ebola virus surface glycoprotein for more than a decade after infection. From this survivor we isolated monoclonal antibodies (mAbs) that neutralize recent and previous outbreak variants of Ebola virus and mediate antibody-dependent cell-mediated cytotoxicity in vitro. Strikingly, monotherapy with mAb114 protected macaques when given as late as 5 days after challenge. Treatment with a single human mAb suggests that a simplified therapeutic strategy for human Ebola infection may be possible.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Corti, Davide -- Misasi, John -- Mulangu, Sabue -- Stanley, Daphne A -- Kanekiyo, Masaru -- Wollen, Suzanne -- Ploquin, Aurelie -- Doria-Rose, Nicole A -- Staupe, Ryan P -- Bailey, Michael -- Shi, Wei -- Choe, Misook -- Marcus, Hadar -- Thompson, Emily A -- Cagigi, Alberto -- Silacci, Chiara -- Fernandez-Rodriguez, Blanca -- Perez, Laurent -- Sallusto, Federica -- Vanzetta, Fabrizia -- Agatic, Gloria -- Cameroni, Elisabetta -- Kisalu, Neville -- Gordon, Ingelise -- Ledgerwood, Julie E -- Mascola, John R -- Graham, Barney S -- Muyembe-Tamfun, Jean-Jacques -- Trefry, John C -- Lanzavecchia, Antonio -- Sullivan, Nancy J -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2016 Mar 18;351(6279):1339-42. doi: 10.1126/science.aad5224. Epub 2016 Feb 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Research in Biomedicine, Universita della Svizzera Italiana, CH-6500 Bellinzona, Switzerland. Humabs BioMed SA, 6500 Bellinzona, Switzerland. ; Vaccine Research Center, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA. ; U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA. ; Institute for Research in Biomedicine, Universita della Svizzera Italiana, CH-6500 Bellinzona, Switzerland. ; Humabs BioMed SA, 6500 Bellinzona, Switzerland. ; National Institute for Biomedical Research, National Laboratory of Public Health, Kinshasa B.P. 1197, Democratic Republic of the Congo. ; Institute for Research in Biomedicine, Universita della Svizzera Italiana, CH-6500 Bellinzona, Switzerland. Institute of Microbiology, ETH Zurich, CH-8093 Zurich, Switzerland. ; Vaccine Research Center, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA. njsull@mail.nih.gov.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26917593" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Animals ; Antibodies, Monoclonal/*administration & dosage/immunology/isolation & ; purification ; Antibodies, Neutralizing/*administration & dosage/immunology/isolation & ; purification ; Antibodies, Viral/*administration & dosage/immunology/isolation & purification ; Clinical Trials as Topic ; Disease Outbreaks ; Ebolavirus/*immunology ; Female ; Hemorrhagic Fever, Ebola/epidemiology/*prevention & control ; Humans ; Macaca ; Male ; Molecular Sequence Data ; Survivors
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  • 86
    Publication Date: 2016-03-19
    Description: Steroids regulate cell proliferation, tissue development, and cell signaling via two pathways: a nuclear receptor mechanism and genome-independent signaling. Sperm activation, egg maturation, and steroid-induced anesthesia are executed via the latter pathway, the key components of which remain unknown. Here, we present characterization of the human sperm progesterone receptor that is conveyed by the orphan enzyme alpha/beta hydrolase domain-containing protein 2 (ABHD2). We show that ABHD2 is highly expressed in spermatozoa, binds progesterone, and acts as a progesterone-dependent lipid hydrolase by depleting the endocannabinoid 2-arachidonoylglycerol (2AG) from plasma membrane. The 2AG inhibits the sperm calcium channel (CatSper), and its removal leads to calcium influx via CatSper and ensures sperm activation. This study reveals that progesterone-activated endocannabinoid depletion by ABHD2 is a general mechanism by which progesterone exerts its genome-independent action and primes sperm for fertilization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miller, Melissa R -- Mannowetz, Nadja -- Iavarone, Anthony T -- Safavi, Rojin -- Gracheva, Elena O -- Smith, James F -- Hill, Rose Z -- Bautista, Diana M -- Kirichok, Yuriy -- Lishko, Polina V -- 1S10OD020062-01/OD/NIH HHS/ -- R01 AR059385/AR/NIAMS NIH HHS/ -- R01AR059385/AR/NIAMS NIH HHS/ -- R01GM111802/GM/NIGMS NIH HHS/ -- R01HD068914/HD/NICHD NIH HHS/ -- R21HD081403/HD/NICHD NIH HHS/ -- S10RR025622/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2016 Apr 29;352(6285):555-9. doi: 10.1126/science.aad6887. Epub 2016 Mar 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA. ; QB3/Chemistry Mass Spectrometry Facility, University of California, Berkeley, CA 94720, USA. ; Department of Cellular and Molecular Physiology; Department of Neuroscience, Program in Cellular Neuroscience, Neurodegeneration, and Repair (CNNR), Yale School of Medicine, Yale University, New Haven, CT 06536, USA. ; Department of Urology, University of California, San Francisco, CA 94143, USA. ; Department of Physiology, University of California, San Francisco, CA 94158, USA. ; Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA. lishko@berkeley.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26989199" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Animals ; Arachidonic Acids/*deficiency ; Calcium/metabolism ; Calcium Channels/metabolism ; Calcium Signaling ; Cell Membrane/metabolism ; Endocannabinoids/*deficiency ; Fertilization ; Glycerides/*deficiency ; Humans ; Hydrolases/genetics/*metabolism ; Male ; Mice ; Mice, Inbred C57BL ; Progesterone/*metabolism/pharmacology ; Rats ; Rats, Wistar ; Receptors, Progesterone/genetics/*metabolism ; Sperm Motility/drug effects/*physiology ; Spermatozoa/drug effects/metabolism/*physiology ; Young Adult
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  • 87
    Publication Date: 2016-03-05
    Description: Examining complete gene knockouts within a viable organism can inform on gene function. We sequenced the exomes of 3222 British adults of Pakistani heritage with high parental relatedness, discovering 1111 rare-variant homozygous genotypes with predicted loss of function (knockouts) in 781 genes. We observed 13.7% fewer homozygous knockout genotypes than we expected, implying an average load of 1.6 recessive-lethal-equivalent loss-of-function (LOF) variants per adult. When genetic data were linked to the individuals' lifelong health records, we observed no significant relationship between gene knockouts and clinical consultation or prescription rate. In this data set, we identified a healthy PRDM9-knockout mother and performed phased genome sequencing on her, her child, and control individuals. Our results show that meiotic recombination sites are localized away from PRDM9-dependent hotspots. Thus, natural LOF variants inform on essential genetic loci and demonstrate PRDM9 redundancy in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Narasimhan, Vagheesh M -- Hunt, Karen A -- Mason, Dan -- Baker, Christopher L -- Karczewski, Konrad J -- Barnes, Michael R -- Barnett, Anthony H -- Bates, Chris -- Bellary, Srikanth -- Bockett, Nicholas A -- Giorda, Kristina -- Griffiths, Christopher J -- Hemingway, Harry -- Jia, Zhilong -- Kelly, M Ann -- Khawaja, Hajrah A -- Lek, Monkol -- McCarthy, Shane -- McEachan, Rosie -- O'Donnell-Luria, Anne -- Paigen, Kenneth -- Parisinos, Constantinos A -- Sheridan, Eamonn -- Southgate, Laura -- Tee, Louise -- Thomas, Mark -- Xue, Yali -- Schnall-Levin, Michael -- Petkov, Petko M -- Tyler-Smith, Chris -- Maher, Eamonn R -- Trembath, Richard C -- MacArthur, Daniel G -- Wright, John -- Durbin, Richard -- van Heel, David A -- GM 099640/GM/NIGMS NIH HHS/ -- MR/M009017/1/Medical Research Council/United Kingdom -- R01 GM104371/GM/NIGMS NIH HHS/ -- R01GM104371/GM/NIGMS NIH HHS/ -- WT098051/Wellcome Trust/United Kingdom -- WT099769/Wellcome Trust/United Kingdom -- WT101597/Wellcome Trust/United Kingdom -- WT102627/Wellcome Trust/United Kingdom -- British Heart Foundation/United Kingdom -- Arthritis Research UK/United Kingdom -- Cancer Research UK/United Kingdom -- Department of Health/United Kingdom -- Chief Scientist Office/United Kingdom -- New York, N.Y. -- Science. 2016 Apr 22;352(6284):474-7. doi: 10.1126/science.aac8624. Epub 2016 Mar 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wellcome Trust Sanger Institute, Hinxton, Cambridge CB10 1SA, UK. ; Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK. ; Bradford Institute for Health Research, Bradford Teaching Hospitals National Health Service (NHS) Foundation Trust, Bradford BD9 6RJ, UK. ; Center for Genome Dynamics, The Jackson Laboratory, Bar Harbor, ME 04609, USA. ; Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, MA 02114, USA. Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. ; William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK. ; Diabetes and Endocrine Centre, Heart of England NHS Foundation Trust and University of Birmingham, Birmingham B9 5SS, UK. ; TPP, Mill House, Troy Road, Leeds LS18 5TN, UK. ; Aston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UK. ; 10X Genomics, 7068 Koll Center Parkway, Suite 415, Pleasanton, CA 94566, USA. ; Farr Institute of Health Informatics Research, London NW1 2DA, UK. Institute of Health Informatics, University College London, London NW1 2DA, UK. ; School of Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, UK. ; Department of Medical Genetics, University of Cambridge and National Institute for Health Research (NIHR) Cambridge Biomedical Research Centre, Box 238, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK. Cambridge University Hospitals NHS Foundation Trust, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK. ; Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK. Faculty of Life Sciences and Medicine, King's College London, London SE1 1UL, UK. ; Wellcome Trust Sanger Institute, Hinxton, Cambridge CB10 1SA, UK. rd@sanger.ac.uk d.vanheel@qmul.ac.uk. ; Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK. rd@sanger.ac.uk d.vanheel@qmul.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26940866" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; *Consanguinity ; DNA Mutational Analysis ; Drug Prescriptions ; Exome/genetics ; Female ; Fertility ; Gene Knockout Techniques ; Genes, Lethal ; Genetic Loci ; Genome, Human ; Great Britain ; *Health ; Histone-Lysine N-Methyltransferase/*genetics ; Homologous Recombination ; Homozygote ; Humans ; Male ; Mothers ; Pakistan/ethnology ; Phenotype
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  • 88
    Publication Date: 2015-11-07
    Description: In a classical view of hematopoiesis, the various blood cell lineages arise via a hierarchical scheme starting with multipotent stem cells that become increasingly restricted in their differentiation potential through oligopotent and then unipotent progenitors. We developed a cell-sorting scheme to resolve myeloid (My), erythroid (Er), and megakaryocytic (Mk) fates from single CD34(+) cells and then mapped the progenitor hierarchy across human development. Fetal liver contained large numbers of distinct oligopotent progenitors with intermingled My, Er, and Mk fates. However, few oligopotent progenitor intermediates were present in the adult bone marrow. Instead, only two progenitor classes predominate, multipotent and unipotent, with Er-Mk lineages emerging from multipotent cells. The developmental shift to an adult "two-tier" hierarchy challenges current dogma and provides a revised framework to understand normal and disease states of human hematopoiesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Notta, Faiyaz -- Zandi, Sasan -- Takayama, Naoya -- Dobson, Stephanie -- Gan, Olga I -- Wilson, Gavin -- Kaufmann, Kerstin B -- McLeod, Jessica -- Laurenti, Elisa -- Dunant, Cyrille F -- McPherson, John D -- Stein, Lincoln D -- Dror, Yigal -- Dick, John E -- Canadian Institutes of Health Research/Canada -- Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2016 Jan 8;351(6269):aab2116. doi: 10.1126/science.aab2116. Epub 2015 Nov 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada. Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada. ; Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada. ; Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada. Ontario Institute for Cancer Research, Toronto, Ontario, Canada. ; Wellcome Trust, Medical Research Council Cambridge Stem Cell Institute, Department of Haematology, University of Cambridge, Cambridge, UK. ; Ecole Polytechnique Federale de Lausanne, LMC, Station 12, Lausanne, CH-1015, Switzerland. ; Medical Biophysics, University of Toronto, Toronto, Ontario, Canada. Ontario Institute for Cancer Research, Toronto, Ontario, Canada. ; The Hospital for Sick Children Research Institute, University of Toronto, Ontario, Canada. ; Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada. Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada. jdick@uhnres.utoronto.ca.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26541609" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Antigens, CD34/analysis ; Cell Lineage/genetics/*physiology ; Cell Separation ; Cells, Cultured ; Erythroid Cells/*cytology ; Fetal Blood/cytology ; Gene Expression Profiling ; Hematopoiesis/genetics/*physiology ; Humans ; Liver/cytology/embryology ; Megakaryocyte Progenitor Cells/*cytology ; Megakaryocytes/*cytology ; Multipotent Stem Cells/cytology ; Myeloid Cells/*cytology ; Transcription, Genetic
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  • 89
    Publication Date: 2016-04-23
    Description: Influenza A virus (IAV) causes up to half a million deaths worldwide annually, 90% of which occur in older adults. We show that IAV-infected monocytes from older humans have impaired antiviral interferon production but retain intact inflammasome responses. To understand the in vivo consequence, we used mice expressing a functional Mx gene encoding a major interferon-induced effector against IAV in humans. In Mx1-intact mice with weakened resistance due to deficiencies in Mavs and Tlr7, we found an elevated respiratory bacterial burden. Notably, mortality in the absence of Mavs and Tlr7 was independent of viral load or MyD88-dependent signaling but dependent on bacterial burden, caspase-1/11, and neutrophil-dependent tissue damage. Therefore, in the context of weakened antiviral resistance, vulnerability to IAV disease is a function of caspase-dependent pathology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pillai, Padmini S -- Molony, Ryan D -- Martinod, Kimberly -- Dong, Huiping -- Pang, Iris K -- Tal, Michal C -- Solis, Angel G -- Bielecki, Piotr -- Mohanty, Subhasis -- Trentalange, Mark -- Homer, Robert J -- Flavell, Richard A -- Wagner, Denisa D -- Montgomery, Ruth R -- Shaw, Albert C -- Staeheli, Peter -- Iwasaki, Akiko -- 5T32HL066987-13/HL/NHLBI NIH HHS/ -- AI062428/AI/NIAID NIH HHS/ -- AI064705/AI/NIAID NIH HHS/ -- AI081884/AI/NIAID NIH HHS/ -- F31 AG039163/AG/NIA NIH HHS/ -- HHSN272201100019C/PHS HHS/ -- K24 AG02489/AG/NIA NIH HHS/ -- K24 AG042489/AG/NIA NIH HHS/ -- N01 AI500031/AI/NIAID NIH HHS/ -- P30 AG21342/AG/NIA NIH HHS/ -- R01HL102101/HL/NHLBI NIH HHS/ -- R01HL125501/HL/NHLBI NIH HHS/ -- T32 AI007019-36/AI/NIAID NIH HHS/ -- T32 AI007019-38/AI/NIAID NIH HHS/ -- T32 AI055403/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2016 Apr 22;352(6284):463-6. doi: 10.1126/science.aaf3926.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunobiology, Yale School of Medicine, New Haven, CT 06520, USA. ; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA. ; Section of Infectious Diseases, Department of Internal Medicine, Yale School of Medicine, New Haven, Connecticut, USA. ; Department of Internal Medicine, Yale School of Medicine, New Haven, Connecticut, USA. ; Department of Pathology, Yale School of Medicine, New Haven, CT 06520, USA. ; Department of Immunobiology, Yale School of Medicine, New Haven, CT 06520, USA. Howard Hughes Medical Institute, Yale School of Medicine, New Haven, CT 06520, USA. ; Section of Rheumatology, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06520, USA. ; Institut fur Medizinische Mikrobiologie und Hygiene, Institute of Virology, University Medical Center Freiburg, Hermann-Herder-Strasse 11, 79104 Freiburg, Germany. ; Department of Immunobiology, Yale School of Medicine, New Haven, CT 06520, USA. Howard Hughes Medical Institute, Yale School of Medicine, New Haven, CT 06520, USA. akiko.iwasaki@yale.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27102485" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing/genetics/metabolism ; Adult ; Aged ; Aged, 80 and over ; Animals ; Bacterial Infections/etiology/*immunology ; Caspase 1/metabolism ; Caspases/metabolism ; Female ; Humans ; Immunity, Innate/genetics/*immunology ; Influenza A virus/*immunology ; Influenza, Human/complications/*immunology ; Interferon-beta/immunology ; Male ; Membrane Glycoproteins/genetics/metabolism ; Mice ; Monocytes/immunology ; Myxovirus Resistance Proteins/genetics/*physiology ; Neutrophils/immunology ; Orthomyxoviridae Infections/*immunology ; Respiratory Tract Infections/*immunology/microbiology ; Toll-Like Receptor 7/genetics/metabolism ; Viral Load ; Young Adult
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  • 90
    Publication Date: 2016-09-02
    Description: Effective differentiation of prochiral carbon–hydrogen (C–H) bonds on a single methylene carbon via asymmetric metal insertion remains a challenge. Here, we report the discovery of chiral acetyl-protected aminoethyl quinoline ligands that enable asymmetric palladium insertion into prochiral C–H bonds on a single methylene carbon center. We apply these palladium complexes to catalytic enantioselective functionalization of β-methylene C–H bonds in aliphatic amides. Using bidentate ligands to accelerate C–H activation of otherwise unreactive monodentate substrates is crucial for outcompeting the background reaction driven by substrate-directed cyclopalladation, thereby avoiding erosion of enantioselectivity. The potential of ligand acceleration in C–H activation is also demonstrated by enantioselective β-C–H arylation of simple carboxylic acids without installing directing groups.
    Keywords: Chemistry
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  • 91
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-11
    Description: Vicinal diamines are a common structural motif in bioactive natural products, therapeutic agents, and molecular catalysts, motivating the continuing development of efficient, selective, and sustainable technologies for their preparation. We report an operationally simple and environmentally friendly protocol that converts alkenes and sodium azide—both readily available feedstocks—to 1,2-diazides. Powered by electricity and catalyzed by Earth-abundant manganese, this transformation proceeds under mild conditions and exhibits exceptional substrate generality and functional group compatibility. Using standard protocols, the resultant 1,2-diazides can be smoothly reduced to vicinal diamines in a single step, with high chemoselectivity. Mechanistic studies are consistent with metal-mediated azidyl radical transfer as the predominant pathway, enabling dual carbon-nitrogen bond formation.
    Keywords: Chemistry
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  • 92
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-18
    Keywords: Chemistry
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  • 93
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-18
    Keywords: Chemistry
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  • 94
    Publication Date: 2017-08-18
    Description: In methanogenic archaea, the carbon dioxide (CO 2 ) fixation and methane-forming steps are linked through the heterodisulfide reductase (HdrABC)–[NiFe]-hydrogenase (MvhAGD) complex that uses flavin-based electron bifurcation to reduce ferredoxin and the heterodisulfide of coenzymes M and B. Here, we present the structure of the native heterododecameric HdrABC-MvhAGD complex at 2.15-angstrom resolution. HdrB contains two noncubane [4Fe-4S] clusters composed of fused [3Fe-4S]-[2Fe-2S] units sharing 1 iron (Fe) and 1 sulfur (S), which were coordinated at the CCG motifs. Soaking experiments showed that the heterodisulfide is clamped between the two noncubane [4Fe-4S] clusters and homolytically cleaved, forming coenzyme M and B bound to each iron. Coenzymes are consecutively released upon one-by-one electron transfer. The HdrABC-MvhAGD atomic model serves as a structural template for numerous HdrABC homologs involved in diverse microbial metabolic pathways.
    Keywords: Chemistry
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  • 95
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-25
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 96
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-09-01
    Keywords: Chemistry
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  • 97
    Publication Date: 2017-08-25
    Description: Current catalytic processes involving carbon-carbon bond activation rely on -unsaturated coupling partners. Exploiting the concept of transfer hydrogenative coupling, we report a ruthenium(0)-catalyzed cycloaddition of benzocyclobutenones that functionalizes two adjacent saturated diol carbon-hydrogen bonds. These regio- and diastereoselective processes enable convergent construction of type II polyketide substructures.
    Keywords: Chemistry
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  • 98
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-25
    Keywords: Chemistry
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  • 99
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-25
    Description: We imaged the interfacial structure and dynamics of water in a microscopically confined geometry, in three dimensions and on millisecond time scales, with a structurally illuminated wide-field second harmonic microscope. The second harmonic images reported on the orientational order of interfacial water, induced by charge-dipole interactions between water molecules and surface charges. The images were converted into surface potential maps. Spatially resolved surface acid dissociation constant (p K a,s ) values were determined for the silica deprotonation reaction by following pH-induced chemical changes on the curved and confined surfaces of a glass microcapillary immersed in aqueous solutions. These values ranged from 2.3 to 10.7 along the wall of a single capillary because of surface heterogeneities. Water molecules that rotate along an oscillating external electric field were also imaged.
    Keywords: Chemistry
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  • 100
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-08-25
    Keywords: Chemistry
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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