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  • Science (New York, N.Y.)  (18)
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Year
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  • 1
    Article
    Article
    In: Science, June 14, 1996, Vol.272(5268), p.1598(1)
    Description: Bacteria often practice autoinduction, in which a molecule released and reabsorbed by the same cell adjusts genetic expression according to local density of signalling cells. Autoinducers, first noticed in luminescent bacteria, were identified in Agrobacterium tumefaciens by Margaret More.
    Keywords: Bacteria -- Research ; Cell Interactions -- Research ; Bioluminescence -- Research ; Genetic Regulation -- Research
    ISSN: 0036-8075
    E-ISSN: 10959203
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  • 2
    Language: English
    In: Science, 11 February 2005, Vol.307(5711), pp.884-890
    Description: Understanding the behavior of the universe at large depends critically on insights about the smallest units of matter and their fundamental interactions. Inflationary cosmology is a highly successful framework for exploring these interconnections between particle physics and gravitation. Inflation makes several predictions about the present state of the universe-such as its overall shape, large-scale smoothness, and smaller scale structure-which are being tested to unprecedented accuracy by a new generation of astronomical measurements. The agreement between these predictions and the latest observations is extremely promising. Meanwhile, physicists are busy trying to understand inflation's ultimate implications for the nature of matter, energy, and spacetime.
    Keywords: Physical sciences -- Astronomy -- Astronomical cosmology ; Physical sciences -- Physics -- Astronomical cosmology ; Physical sciences -- Astronomy -- Astronomical cosmology ; Physical sciences -- Astronomy -- Energy ; Physical sciences -- Physics -- Mathematical physics ; Physical sciences -- Physics -- Linear algebra ; Mathematics -- Pure mathematics -- Fundamental forces ; Physical sciences -- Physics -- Matter ; Physical sciences -- Physics -- Astrophysics ; Physical sciences -- Astronomy -- Astrophysics
    ISSN: 00368075
    E-ISSN: 10959203
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  • 3
    Language: English
    In: Science (New York, N.Y.), 11 October 2013, Vol.342(6155), pp.224-7
    Description: Structural rearrangements control a wide range of behavior in amorphous materials, and visualizing these atomic-scale rearrangements is critical for developing and refining models for how glasses bend, break, and melt. It is difficult, however, to directly image atomic motion in disordered solids. We demonstrate that using aberration-corrected transmission electron microscopy, we can excite and image atomic rearrangements in a two-dimensional silica glass-revealing a complex dance of elastic and plastic deformations, phase transitions, and their interplay. We identified the strain associated with individual ring rearrangements, observed the role of vacancies in shear deformation, and quantified fluctuations at a glass/liquid interface. These examples illustrate the wide-ranging and fundamental materials physics that can now be studied at atomic-resolution via transmission electron microscopy of two-dimensional glasses.
    Keywords: Atomic Structure -- Research ; Imaging -- Methods ; Silicon Dioxide -- Atomic Properties ; Silicon Dioxide -- Structure ; Glass -- Atomic Properties ; Glass -- Composition ; Glass -- Structure;
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 4
    Language: English
    In: Science, 21 August 1998, Vol.281(5380), pp.1202-1206
    Description: Nitrogen-fixing bacteroids in legume root nodules are surrounded by the plant-derived peribacteroid membrane, which controls nutrient transfer between the symbionts. A nodule complementary DNA (GmSAT1) encoding an ammonium transporter has been isolated from soybean. GmSAT1 is preferentially transcribed in nodules and immunoblotting indicates that GmSAT1 is located on the peribacteroid membrane. [$^{14}$C]methylammonium uptake and patch-clamp analysis of yeast expressing GmSAT1 demonstrated that it shares properties with a soybean peribacteroid membrane NH$_4^+$ channel described elsewhere. GmSAT1 is likely to be involved in the transfer of fixed nitrogen from the bacteroid to the host.
    Keywords: Biological sciences -- Biology -- Mycology ; Health sciences -- Medical conditions -- Diseases ; Biological sciences -- Biology -- Cytology ; Applied sciences -- Food science -- Foodstuffs ; Physical sciences -- Chemistry -- Chemical compounds ; Biological sciences -- Biology -- Botany ; Biological sciences -- Biology -- Botany ; Physical sciences -- Chemistry -- Chemical compounds ; Biological sciences -- Biology -- Microbiology ; Physical sciences -- Chemistry -- Chemical compounds
    ISSN: 00368075
    E-ISSN: 10959203
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  • 5
    Language: English
    In: Science (New York, N.Y.), 11 February 2005, Vol.307(5711), pp.884-90
    Description: Understanding the behavior of the universe at large depends critically on insights about the smallest units of matter and their fundamental interactions. Inflationary cosmology is a highly successful framework for exploring these interconnections between particle physics and gravitation. Inflation makes several predictions about the present state of the universe-such as its overall shape, large-scale smoothness, and smaller scale structure-which are being tested to unprecedented accuracy by a new generation of astronomical measurements. The agreement between these predictions and the latest observations is extremely promising. Meanwhile, physicists are busy trying to understand inflation's ultimate implications for the nature of matter, energy, and spacetime.
    E-ISSN: 1095-9203
    Source: MEDLINE/PubMed (U.S. National Library of Medicine)
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  • 6
    Language: English
    In: Science (New York, N.Y.), 31 August 2018, Vol.361(6405), pp.834
    Keywords: Financial Support ; Intellectual Property ; Theft ; Biomedical Research -- Economics ; National Institutes of Health (U.S.) -- Economics
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 7
    Language: English
    In: Science (New York, N.Y.), 23 December 2011, Vol.334(6063), pp.1613
    Keywords: Budgets -- Legislation & Jurisprudence ; National Institutes of Health (U.S.) -- Economics ; United States Government Agencies -- Economics
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 8
    Language: English
    In: Science (New York, N.Y.), 04 October 2013, Vol.342(6154), pp.22
    Description: An epic stalemate between the Democrat-controlled Senate and the Republican-controlled House of Representatives resulted in a partial shutdown of the U.S. government on 1 October. The shutdown paralyzed science funding agencies, stalled government-run science projects, and sent more than 800,000 federal workers home from their jobs. But a select few scientists deemed essential to government functions are still at work, including physicists tending an atomic clock, biomedical researchers taking care of laboratory mice, and an expert on bird identification.
    Keywords: Federal Government ; Natural History -- Economics
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 9
    Language: English
    In: Science (New York, N.Y.), 06 August 2004, Vol.305(5685), pp.858-62
    Description: Vesicle fusion involves vesicle tethering, docking, and membrane merger. We show that mitofusin, an integral mitochondrial membrane protein, is required on adjacent mitochondria to mediate fusion, which indicates that mitofusin complexes act in trans (that is, between adjacent mitochondria). A heptad repeat region (HR2) mediates mitofusin oligomerization by assembling a dimeric, antiparallel coiled coil. The transmembrane segments are located at opposite ends of the 95 angstrom coiled coil and provide a mechanism for organelle tethering. Consistent with this proposal, truncated mitofusin, in an HR2-dependent manner, causes mitochondria to become apposed with a uniform gap. Our results suggest that HR2 functions as a mitochondrial tether before fusion.
    Keywords: Gtp Phosphohydrolases -- Chemistry ; Mitochondria -- Metabolism
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 10
    Language: English
    In: Science (New York, N.Y.), 26 October 2012, Vol.338(6106), pp.456-61
    Description: 2012 ElectionA special Focus package examines the science-related issues facing the next U.S. president and, for the few that have been featured in the campaign, the positions the candidates have taken on them. Next month's election will also determine the makeup of Congress for the next 2 years, so we bring you [one House of Representatives race in which federal science policy is receiving an unusual amount of attention][1]. Another story explores [new research on negative advertising][2], a reviled but increasingly popular mode of trying to influence voters. And we also look at a passel of [state initiatives appearing on the ballot that affect the scientific community][3], including a hotly contested proposal in California to label genetically modified foods. [1]: http://www.sciencemag.org/cgi/content/short/338/6106/463 [2]: http://www.sciencemag.org/cgi/content/short/338/6106/465 [3]: http://www.sciencemag.org/cgi/content/short/338/6106/464
    Keywords: Sciences (General) ; Biology;
    E-ISSN: 1095-9203
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