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[Report] Direct observation of triplet energy transfer from semiconductor nanocrystals

22-Jan-2016 | Cédric Mongin; Sofia Garakyaraghi; Natalia Razgoniaeva; Mikhail Zamkov; Felix N. Castellano, Science , 2016

Triplet excitons are pervasive in both organic and inorganic semiconductors but generally remain confined to the material in which they originate. We demonstrated by transient absorption spectroscopy that cadmium selenide semiconductor nanoparticles, selectively excited by green light, engage in ...

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[Perspective] What is an adult stem cell?

11-Dec-2015 | Hans Clevers, Science , 2015

The paradigm of the hematopoietic stem cell (HSC) has become deeply engrained in our minds, ever since bone marrow transplantation technology narrowed in on this almost magical multipotent entity that gives rise to all blood cells. The HSC's ability to “self-renew” as well as to proceed down ...

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[In Depth] NSF's novel solution to a workload crunch

04-Dec-2015 | Jeffrey Mervis, Science , 2015

The National Science Foundation (NSF) frequently cites its low overhead costs when asking Congress for more money. But there's a downside to that efficiency—the risk of overloading the program officers who manage research grants. The workload problem became acute in 2004, after the number of ...

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[Report] Cotranslational protein folding on the ribosome monitored in real time

27-Nov-2015 | Wolf Holtkamp; Goran Kokic; Marcus Jäger; Joerg Mittelstaet; Anton A. Komar; Marina V. Rodnina, Science , 2015

Protein domains can fold into stable tertiary structures while they are synthesized on the ribosome. We used a high-performance, reconstituted in vitro translation system to investigate the folding of a small five-helix protein domain—the N-terminal domain of Escherichia coli N5-glutamine ...

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[Report] Near-unity photoluminescence quantum yield in MoS2

27-Nov-2015 | Matin Amani; Der-Hsien Lien; Daisuke Kiriya; Jun Xiao; Angelica Azcatl; Jiyoung Noh; Surabhi R. Madhvapathy; Rafik A ..., Science , 2015

Two-dimensional (2D) transition metal dichalcogenides have emerged as a promising material system for optoelectronic applications, but their primary figure of merit, the room-temperature photoluminescence quantum yield (QY), is extremely low. The prototypical 2D material molybdenum disulfide ...

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[Report] Open-ocean fish reveal an omnidirectional solution to camouflage in polarized environments

20-Nov-2015 | Parrish C. Brady; Alexander A. Gilerson; George W. Kattawar; James M. Sullivan; Michael S. Twardowski; Heidi M. Dier ..., Science , 2015

Despite appearing featureless to our eyes, the open ocean is a highly variable environment for polarization-sensitive viewers. Dynamic visual backgrounds coupled with predator encounters from all possible directions make this habitat one of the most challenging for camouflage. We tested ...

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[Perspective] Love at second sight for CO2 and H2 in organic synthesis

06-Nov-2015 | Jürgen Klankermayer; Walter Leitner, Science , 2015

Many romantic comedies are based on a couple with opposite personalities who fall in love, lose track of each other, and reunite against all odds, most often with the help of a mediator. This cinematic scenario recaps the recent progress in bringing together two molecular actors, carbon dioxide ...

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[Feature] Cradle of life

30-Oct-2015 | Lizzie Wade, Science , 2015

The Amazon rainforest contains 10% of the world's known species, making it one of the most biodiverse places in the world. But when, and why, did it come to be that way? Scientists agree that the Amazon's rich biodiversity was shaped by convulsive geological changes—mountains rising, coasts ...

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[Book Review] Beyond “publish or perish”

02-Oct-2015 | Johanna Gutlerner, Science , 2015

Experts have been debating whether we are training too many Ph.D.s for the jobs that exist for more than 40 years, but is this really the problem? While acknowledging that some reduction in the number of trainees may be necessary, Leonard Cassuto has a different solution to the glut of graduate ...

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[Report] Atomically thin two-dimensional organic-inorganic hybrid perovskites

25-Sep-2015 | Letian Dou; Andrew B. Wong; Yi Yu; Minliang Lai; Nikolay Kornienko; Samuel W. Eaton; Anthony Fu; Connor G. Bischak; ..., Science , 2015

Organic-inorganic hybrid perovskites, which have proved to be promising semiconductor materials for photovoltaic applications, have been made into atomically thin two-dimensional (2D) sheets. We report the solution-phase growth of single- and few-unit-cell-thick single-crystalline 2D hybrid ...

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