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29 Aktuelle Fachpublikationen zum Thema Addition

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[In Depth] Leaf bacteria fertilize trees, researchers claim

22.05.2015 | Elizabeth Pennisi, Science , 2015

One of the fastest growing trees, poplars, may rely on tiny microbes in their leaves to fuel their growth. For more than a decade, a lone researcher has been building a case for nitrogen fixation by bacteria living in poplar leaves. There have been many claims of nitrogen fixation in plants ...

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[Perspective] More than just bugs in spit

08.05.2015 | Clifton Barry, Science , 2015

The development of new drugs for tuberculosis (TB) is not for the faint of heart. In addition to all the typical hurdles to developing a new anti-infective, additional complications result from the complex pathology induced by the disease. Because the bacillus is surrounded by a thick, waxy coat, ...

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[Report] Creating and probing electron whispering-gallery modes in graphene

08.05.2015 | Yue Zhao; Jonathan Wyrick; Fabian D. Natterer; Joaquin F. Rodriguez-Nieva; Cyprian Lewandowski; Kenji Watanabe; Taka ..., Science , 2015

The design of high-finesse resonant cavities for electronic waves faces challenges due to short electron coherence lengths in solids. Complementing previous approaches to confine electronic waves by carefully positioned adatoms at clean metallic surfaces, we demonstrate an approach inspired by ...

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[Report] Adhesion and friction in mesoscopic graphite contacts

08.05.2015 | Elad Koren; Emanuel Lörtscher; Colin Rawlings; Armin W. Knoll; Urs Duerig, Science , 2015

The weak interlayer binding in two-dimensional layered materials such as graphite gives rise to poorly understood low-friction characteristics. Accurate measurements of the adhesion forces governing the overall mechanical stability have also remained elusive. We report on the direct mechanical ...

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[Technical Response] Response to Comment on “Local reorganization of xanthophores fine-tunes and colors the striped pattern of zebrafish”

17.04.2015 | Ajeet Pratap Singh; Hans-Georg Frohnhöfer; Uwe Irion; Christiane Nüsslein-Volhard, Science , 2015

Watanabe and Kondo question our conclusion that the current Turing-type model of color patterning in zebrafish requires modification. In addition to xanthophores and melanophores, iridophores are essential for stripe formation in the body, although not in the fins. A model of predictive value ...

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[Report] Mutation rate and genotype variation of Ebola virus from Mali case sequences

03.04.2015 | T. Hoenen; D. Safronetz; A. Groseth; K. R. Wollenberg; O. A. Koita; B. Diarra; I. S. Fall; F. C. Haidara; F. Diallo; ..., Science , 2015

The occurrence of Ebola virus (EBOV) in West Africa during 2013–2015 is unprecedented. Early reports suggested that in this outbreak EBOV is mutating twice as fast as previously observed, which indicates the potential for changes in transmissibility and virulence and could render current ...

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[Special Issue Review] Adoptive cell transfer as personalized immunotherapy for human cancer

03.04.2015 | Steven A. Rosenberg; Nicholas P. Restifo, Science , 2015

Adoptive cell therapy (ACT) is a highly personalized cancer therapy that involves administration to the cancer-bearing host of immune cells with direct anticancer activity. ACT using naturally occurring tumor-reactive lymphocytes has mediated durable, complete regressions in patients with ...

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[In Depth] ‘Fixed’ nitrogen found in martian soil

27.03.2015 | Eric Hand, Science , 2015

In addition to organic molecules, the Curiosity rover has found another key chemical lurking in the martian soil: nitrates—the NO3-bearing compounds that are crucial ingredients for life on Earth and a chief component in fertilizer. The nitrogen is thought to come from the martian atmosphere, ...

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[Report] Single-protein spin resonance spectroscopy under ambient conditions

06.03.2015 | Fazhan Shi; Qi Zhang; Pengfei Wang; Hongbin Sun; Jiarong Wang; Xing Rong; Ming Chen; Chenyong Ju; Friedemann Reinhar ..., Science , 2015

Magnetic resonance is essential in revealing the structure and dynamics of biomolecules. However, measuring the magnetic resonance spectrum of single biomolecules has remained an elusive goal. We demonstrate the detection of the electron spin resonance signal from a single spin-labeled protein ...

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[Report] An arboreal docodont from the Jurassic and mammaliaform ecological diversification

13.02.2015 | Qing-Jin Meng; Qiang Ji; Yu-Guang Zhang; Di Liu; David M. Grossnickle; Zhe-Xi Luo, Science , 2015

A new docodontan mammaliaform from the Middle Jurassic of China has skeletal features for climbing and dental characters indicative of an omnivorous diet that included plant sap. This fossil expands the range of known locomotor adaptations in docodontans to include climbing, in addition to ...

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