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  • 1
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    Vision and air flow combine to streamline flying honeybees (2013)
    Springer Nature
    Details
    Publication Date: 2013-09-11
    Description: Insects face the challenge of integrating multi-sensory information to control their flight. Here we study a ‘streamlining’ response in honeybees, whereby honeybees raise their abdomen to reduce drag. We find that this response, which was recently reported to be mediated by optic flow, is also strongly modulated by the presence of air flow simulating a head wind. The Johnston's organs in the antennae were found to play a role in the measurement of the air speed that is used to control the streamlining response. The response to a combination of visual motion and wind is complex and can be explained by a model that incorporates a non-linear combination of the two stimuli. The use of visual and mechanosensory cues increases the strength of the streamlining response when the stimuli are present concurrently. We propose this multisensory integration will make the response more robust to transient disturbances in either modality. Scientific Reports 3 doi: 10.1038/srep02614
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 2
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    Direct Evidence for Vision-based Control of Flight Speed in Budgerigars (2015)
    Springer Nature
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    Publication Date: 2015-06-06
    Description: We have investigated whether, and, if so, how birds use vision to regulate the speed of their flight. Budgerigars, Melopsittacus undulatus, were filmed in 3-D using high-speed video cameras as they flew along a 25 m tunnel in which stationary or moving vertically oriented black and white stripes were projected on the side walls. We found that the birds increased their flight speed when the stripes were moved in the birds’ flight direction, but decreased it only marginally when the stripes were moved in the opposite direction. The results provide the first direct evidence that Budgerigars use cues based on optic flow, to regulate their flight speed. However, unlike the situation in flying insects, it appears that the control of flight speed in Budgerigars is direction-specific. It does not rely solely on cues derived from optic flow, but may also be determined by energy constraints. Scientific Reports 5 doi: 10.1038/srep10992
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 3
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    Real-Time Measurement of Stress and Damage Evolution during Initial Lithiation of Crystalline Silicon (2011)
    American Physical Society (APS)
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    Publication Date: 2011-07-22
    Description: Author(s): M. J. Chon, V. A. Sethuraman, A. McCormick, V. Srinivasan, and P. R. Guduru Crystalline to amorphous phase transformation during initial lithiation in (100) Si wafers is studied in an electrochemical cell with Li metal as the counter and reference electrode. During initial lithiation, a moving phase boundary advances into the wafer starting from the surface facing the lithi... [Phys. Rev. Lett. 107, 045503] Published Thu Jul 21, 2011
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    High Power Combline Filter for Deep Space Applications (2014)
    Hindawi
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    Publication Date: 2014-09-15
    Description: An S-band, compact, high power filter, for use in the Mars Orbiter Mission (MOM) of Indian Space Research Organization (ISRO), has been designed and tested for multipaction. The telemetry, tracking, and commanding (TT&C) transponder of MOM is required to handle continuous RF power of 200 W in the telemetry path besides simultaneously maintaining an isolation of greater than 145 dBc to its sensitive telecommand path. This is accomplished with the help of a complex diplexer, requiring high power, high rejection transmit path filter, and a low power receive path filter. To reduce the complexity in the multipaction-free design and testing, the transmit path filter of the diplexer is split into a low rejection filter integral to the diplexer and an external high rejection filter. This paper highlights the design and space qualification phases of this high rejection filter. Multipaction test results with 6 dB margin are also presented. Major concerns of this filter design are isolation, insertion loss, and multipaction. Mission performance of the on-board filter is normal.
    Print ISSN: 1687-5826
    Electronic ISSN: 1687-5834
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Hindawi
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  • 5
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    Honeybee navigation: nature and calibration of the "odometer" (2000)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2000-02-05
    Description: There are two theories about how honeybees estimate the distance to food sources. One theory proposes that distance flown is estimated in terms of energy consumption. The other suggests that the cue is visual, and is derived from the extent to which the image of the world has moved on the eye during the trip. Here the two theories are tested by observing dances of bees that have flown through a short, narrow tunnel to collect a food reward. The results show that the honeybee's "odometer" is visually driven. They also provide a calibration of the dance and the odometer in visual terms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Srinivasan, M V -- Zhang, S -- Altwein, M -- Tautz, J -- New York, N.Y. -- Science. 2000 Feb 4;287(5454):851-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Visual Science, Research School of Biological Sciences, Australian National University, Canberra, ACT 2601, Australia. MSrinivasan@anu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10657298" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bees/*physiology ; Behavior, Animal/*physiology ; Cues ; Distance Perception/physiology ; Feeding Behavior/physiology ; Flight, Animal/*physiology ; Motion Perception/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Crystal structures of nucleotide-free and glutathione-bound mitochondrial ABC transporter Atm1 (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-03-08
    Description: The yeast mitochondrial ABC transporter Atm1, in concert with glutathione, functions in the export of a substrate required for cytosolic-nuclear iron-sulfur protein biogenesis and cellular iron regulation. Defects in the human ortholog ABCB7 cause the sideroblastic anemia XLSA/A. Here, we report the crystal structures of free and glutathione-bound Atm1 in inward-facing, open conformations at 3.06- and 3.38-angstrom resolution, respectively. The glutathione binding site includes a residue mutated in XLSA/A and is located close to the inner membrane surface in a large cavity. The two nucleotide-free adenosine 5'-triphosphate binding domains do not interact yet are kept in close vicinity through tight interaction of the two C-terminal alpha-helices of the Atm1 dimer. The resulting protein stabilization may be a common structural feature of all ABC exporters.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Srinivasan, Vasundara -- Pierik, Antonio J -- Lill, Roland -- New York, N.Y. -- Science. 2014 Mar 7;343(6175):1137-40. doi: 10.1126/science.1246729.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Zytobiologie, Philipps-Universitat Marburg, Robert-Koch-Strasse 6, 35032 Marburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24604199" target="_blank"〉PubMed〈/a〉
    Keywords: ATP-Binding Cassette Transporters/*chemistry ; Adenosine Triphosphate/chemistry ; Binding Sites ; Crystallography, X-Ray ; Glutathione/*chemistry ; Mitochondria/*metabolism ; Protein Multimerization ; Protein Stability ; Protein Structure, Secondary ; Saccharomyces cerevisiae Proteins/*chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Enhanced Biogas Production from Co-digestion of Intestine Waste from Slaughterhouse and Food Waste (2017)
    American Chemical Society (ACS)
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    Publication Date: 2017-10-25
    Description: Energy & Fuels DOI: 10.1021/acs.energyfuels.7b01764
    Print ISSN: 0887-0624
    Electronic ISSN: 1520-5029
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society (ACS)
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  • 8
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    The nature and causes of the global water crisis: Syndromes from a meta-analysis of coupled human-water studies (2012)
    Wiley
    Details
    Publication Date: 2012-10-05
    Description: Freshwater scarcity has been cited as the major crisis of the 21st century, but it is surprisingly hard to describe the nature of the global water crisis. We conducted a meta-analysis of 22 coupled human–water system case studies, using qualitative comparison analysis (QCA) to identify water resource system outcomes and the factors that drive them. The cases exhibited different outcomes for human wellbeing that could be grouped into a six “syndromes”: groundwater depletion, ecological destruction, drought-driven conflicts, unmet subsistence needs, resource capture by elite, and water reallocation to nature. For syndromes that were not successful adaptations, three characteristics gave cause for concern: (1) unsustainability—a decline in the water stock or ecosystem function that could result in a long-term steep decline in future human wellbeing; (2) vulnerability—high variability in water resource availability combined with inadequate coping capacity, leading to temporary drops in human wellbeing; (3) chronic scarcity—persistent inadequate access and hence low conditions of human wellbeing. All syndromes could be explained by a limited set of causal factors that fell into four categories: demand changes, supply changes, governance systems, and infrastructure/technology. By considering basins as members of syndrome classes and tracing common causal pathways of water crises, water resource analysts and planners might develop improved water policies aimed at reducing vulnerability, inequity, and unsustainability of freshwater systems.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Green Energy from the Combined Treatment of Liquid and Solid Waste from the Tanning Industry Using an Upflow Anaerobic Sludge Blanket Reactor (2015)
    American Chemical Society (ACS)
    Details
    Publication Date: 2015-03-05
    Description: Energy & Fuels DOI: 10.1021/ef5022686
    Print ISSN: 0887-0624
    Electronic ISSN: 1520-5029
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society (ACS)
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  • 10
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    Panta Rhei 2013-2015: Global perspectives on hydrology, society and change (2016)
    In:  Hydrological Sciences Journal - Journal des Sciences Hydrologiques
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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