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  • 1
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    Measurement of the motional sidebands of a nanogram-scale oscillator in the quantum regime (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-12-03
    Description: Author(s): M. Underwood, D. Mason, D. Lee, H. Xu, L. Jiang, A. B. Shkarin, K. Børkje, S. M. Girvin, and J. G. E. Harris We describe measurements of the motional sidebands produced by a mechanical oscillator (with effective mass 43 ng and resonant frequency 705 kHz) that is placed in an optical cavity and cooled close to its quantum ground state. The red and blue sidebands (corresponding to Stokes and anti-Stokes scat… [Phys. Rev. A 92, 061801(R)] Published Wed Dec 02, 2015
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of a hexokinase complex is associated with changes in energy utilization in celery organs and cells (2000)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 110 (2000), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We previously presented evidence that the hexose-regulated repression of the mannitol catabolic enzyme mannitol dehydrogenase (MTD) in celery (Apium graveolens L.) may be mediated by hexokinase (EC 2.7.1.1) (HK) [Prata et al. (1997) Plant Physiol 114: 307–314]. To see if differential regulation of HK forms might be involved in the sugar-regulated repression of MTD we characterized two forms of HK with respect to their expression in various plant organs as well as in celery suspension cell cultures. We found that the vast majority of HK activity was membrane-associated, whereas fructokinase (EC 2.7.1.4) was found largely in the soluble cell fraction. Gel filtration chromatography further revealed the differential expression of two molecular size classes of HK. One HK (HK-L) chromatographed at 68 kDa, a typical size for a plant HK, while the second (HK-H) chromatographed at 280 kDa. This unique 280 kDa HK was shown to be composed of a 50 kDa HK protein, possibly complexed with other, as yet unidentified, components. The HK-L was present in all cells and organs analyzed, and thus may be a likely candidate for mediation of sugar repression. In contrast, the presence of the HK-H complex was specific to certain organs and cells grown under certain conditions. Our analyses here showed no correlation between the presence of the HK-H and MTD repression or derepression in celery cells. Instead, the HK-H complex was present exclusively in rapidly growing organs and cells, but not in non-growing celery storage tissues or in carbon-depleted celery suspension-cultured cells. Furthermore, the HK-H complex was present when Glc in the growth media was replaced with 2-deoxy Glc, a HK substrate that does not provide energy for growth and metabolism. These results imply that the HK-H complex may have a potentially unique role in the metabolism of rapidly growing celery cells, in particular, in hexose phosphorylation. We also found that mitochondria prepared from Glc-grown celery suspension-cultured cells contained substantial HK activity, and that oxygen uptake of these mitochondria was stimulated by Glc. These results are consistent with the hypothesis that mitochondrial localization of celery HK may play a role in rapid recycling of adenylate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2000.110104.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sucrose phosphate synthase and other sucrose metabolizing enzymes in fruits of various species (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 82 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Recent reports have suggested that sucrose phosphate synthase (EC 2.4.1.14), a key enzyme in sucrose biosynthesis in photosynthetic “source” tissues, may also be important in some sucrose accumulating “sink” tissues. These experiments were conducted to determine if sucrose phosphate synthase is involved in sucrose accumulation in fruits of several species. Peach (Prunus persica NCT 516) and strawberry (Fragaria x ananassa cv. Chandler) fruits were harvested directly from the plant at various stages of fruit development. Kiwi (Actinidia chinensis), papaya (Carica papaya), pineapple (Ananas comosus) and mango (Mangifera indica) were sampled in postharvest storage over a period of several days. Carbohydrate concentrations and activities of sucrose phosphate synthase, sucrose synthase (EC 2.4.1.13), and acid and neutral invertases (EC 3.2.1.26) were measured. All fruits contained significant activities of sucrose phosphate synthase. Moreover, in fruits from all species except pineapple and papaya, there was an increase in sucrose phosphate synthase activity associated with the accumulation of sucrose in situ. The increase in sucrose concentration in peaches was also associated with an increase in sucrose synthase activity and, in strawberries, with increased activity of both sucrose synthase and neutral invertase. The hexose pools in all fruits were comprised of equimolar concentrations of fructose and glucose, except in the mango. In mango, the fructose to glucose ratio increased from 2 to 41 during ripening as sucrose concentration more than doubled. The results of this study indicate that activities of the sucrose metabolizing enzymes, including sucrose phosphate synthase, within the fruit itself, are important in determining the soluble sugar content of fruits of many species. This appears to be true for fruits which sweeten from a starch reserve and in fruits from sorbitol translocating species, raffinose saccharide translocating species, and sucrose translocating species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb00080.x
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  • 4
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    Magmatic constraints on geodynamic models of subduction in the East Carpathians, Romania (1999)
    In:  Tectonophysics, Zagreb, Univ. Tokyo, vol. 297, no. 1, pp. 157-176, pp. L04601, (ISSN: 1340-4202)
    Details
    Publication Date: 1999
    Keywords: Tectonics ; EUROPROBE (Geol. and Geophys. in eastern Europe) ; Geol. aspects ; Plate tectonics ; Subduction zone ; Volcanology ; GeodesyY ; Modelling
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Role of metastable charge states in a quantum-dot spin-qubit readout (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-09-29
    Description: Author(s): J. D. Mason, S. A. Studenikin, A. Kam, Z. R. Wasilewski, A. S. Sachrajda, and J. B. Kycia The authors present an experimental mechanism for converting the state of a spin qubit in a quantum dot device into different charge states. This mechanism depends on metastable charge states present when the device has very asymmetric couplings to the external leads. This approach is used to observe Landau-Zener-Stuckenberg oscillations of the (S- T + ) qubit. [Phys. Rev. B 92, 125434] Published Fri Sep 25, 2015
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Phospholipid Diffusion Coefficients of Cushioned Model Membranes Determined via Z-Scan Fluorescence Correlation Spectroscopy (2013)
    American Chemical Society (ACS)
    In: Langmuir
    Details
    Publication Date: 2013-06-07
    Description: Langmuir DOI: 10.1021/la400768s
    Print ISSN: 0743-7463
    Electronic ISSN: 1520-5827
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society (ACS)
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  • 7
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    Spectroscopy and high-resolution imaging of the gravitational lens SDSS J1206+4332 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-04-07
    Description: We present spectroscopy and laser guide star adaptive optics (LGSAO) images of the doubly imaged lensed quasar SDSS J1206+4332. We revise the deflector redshift proposed previously to z d = 0.745, and measure for the first time its velocity dispersion = (290 ± 30) km s –1 . The LGSAO data show the lensed quasar host galaxy stretching over the astroid caustic thus forming an extra pair of merging images, which was previously thought to be an unrelated galaxy in seeing limited data. Owing to the peculiar geometry, the lens acts as a natural coronagraph on the broad-line region of the quasar so that only narrow $\left.\mathrm{C {\scriptscriptstyle III}}\right]$ emission is found in the fold arc. We use the data to reconstruct the source structure and deflector potential, including nearby perturbers. We reconstruct the point-spread function (PSF) from the quasar images themselves, since no additional point source is present in the field of view. From gravitational lensing and stellar dynamics, we find the slope of the total mass density profile to be ' = –log /log r = 1.93 ± 0.09. We discuss the potential of SDSS J1206+4332 for measuring a time-delay distance (and thus H 0 and other cosmological parameters), or as a standard ruler, in combination with the time-delay published by the COSMOGRAIL collaboration. We conclude that this system is very promising for cosmography. However, in order to achieve competitive precision and accuracy, an independent characterization of the PSF is needed. Spatially resolved kinematics of the deflector would reduce the uncertainties further. Both are within the reach of current observational facilities.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    Topological energy transfer in an optomechanical system with exceptional points (2016)
    Springer Nature
    In: Nature
    Details
    Publication Date: 2016-09-01
    Description: Topological energy transfer in an optomechanical system with exceptional points Nature 537, 7618 (2016). doi:10.1038/nature18604 Authors: H. Xu, D. Mason, Luyao Jiang & J. G. E. Harris Topological operations can achieve certain goals without requiring accurate control over local operational details; for example, they have been used to control geometric phases and have been proposed as a way of controlling the state of certain systems within their degenerate subspaces. More recently, it was predicted that topological operations can be used to transfer energy between normal modes, provided that the system possesses a specific type of degeneracy known as an exceptional point. Here we demonstrate the transfer of energy between two vibrational modes of a cryogenic optomechanical device using topological operations. We show that this transfer arises from the presence of an exceptional point in the spectrum of the device. We also show that this transfer is non-reciprocal. These results open up new directions in system control; they also open up the possibility of exploring other dynamical effects related to exceptional points, including the behaviour of thermal and quantum fluctuations in their vicinity.
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 9
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    Circuits of stress and cognitive dysfunction [Neuroscience] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-06-10
    Description: Repeated stress has been suggested to underlie learning and memory deficits via the basolateral amygdala (BLA) and the hippocampus; however, the functional contribution of BLA inputs to the hippocampus and their molecular repercussions are not well understood. Here we show that repeated stress is accompanied by generation of the Cdk5...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Combining Total Internal Reflection Sum Frequency Spectroscopy Spectral Imaging and Confocal Fluorescence Microscopy (2015)
    American Chemical Society (ACS)
    In: Langmuir
    Details
    Publication Date: 2015-01-14
    Description: Langmuir DOI: 10.1021/la5036932
    Print ISSN: 0743-7463
    Electronic ISSN: 1520-5827
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society (ACS)
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