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  • 1
    Electronic Resource
    Electronic Resource
    A combined stereo-photogrammetry and underwater-video system to study group composition of dolphins (1999)
    Springer
    Helgoland marine research 53 (1999), S. 122-128 
    Details
    ISSN: 1438-3888
    Keywords: Key words  Group composition ; Stereo-photogrammetry ; Underwater-video ; Hector’s dolphin ; Cetaceans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract   One reason for the paucity of knowledge of dolphin social structure is the difficulty of measuring individual dolphins. In Hector’s dolphins, Cephalorhynchus hectori, total body length is a function of age, and sex can be determined by individual colouration pattern. We developed a novel system combining stereo-photogrammetry and underwater-video to record dolphin group composition. The system consists of two downward-looking single-lens-reflex (SLR) cameras and a Hi8 video camera in an underwater housing mounted on a small boat. Bow-riding Hector’s dolphins were photographed and video-taped at close range in coastal waters around the South Island of New Zealand. Three-dimensional, stereoscopic measurements of the distance between the blowhole and the anterior margin of the dorsal fin (BH-DF) were calibrated by a suspended frame with reference points. Growth functions derived from measurements of 53 dead Hector’s dolphins (29 female : 24 male) provided the necessary reference data. For the analysis, the measurements were synchronised with corresponding underwater-video of the genital area. A total of 27 successful measurements (8 with corresponding sex) were obtained, showing how this new system promises to be potentially useful for cetacean studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101520050015
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Click chemistry enables preclinical evaluation of targeted epigenetic therapies (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-06-30
    Description: The success of new therapies hinges on our ability to understand their molecular and cellular mechanisms of action. We modified BET bromodomain inhibitors, an epigenetic-based therapy, to create functionally conserved compounds that are amenable to click chemistry and can be used as molecular probes in vitro and in vivo. We used click proteomics and click sequencing to explore the gene regulatory function of BRD4 (bromodomain containing protein 4) and the transcriptional changes induced by BET inhibitors. In our studies of mouse models of acute leukemia, we used high-resolution microscopy and flow cytometry to highlight the heterogeneity of drug activity within tumor cells located in different tissue compartments. We also demonstrate the differential distribution and effects of BET inhibitors in normal and malignant cells in vivo. This study provides a potential framework for the preclinical assessment of a wide range of drugs.
    Keywords: Medicine, Diseases
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Discovery of a Color-Selected Quasar at z=5.50(sup 1) (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: We present observations of RD J030117+002025, a quasar at z = 5.50 discovered from deep, multi-color, ground-based observations covering 74 arcmin(sup 2).
    Keywords: Astrophysics
    Type: Astrophysical Journal
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Calorimetry of 25 Ah lithium/thionyl chloride cells (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Heat flow measurements of 25-Ah lithium thionyl chloride cells provided a method to calculate an effective thermal potential, E(TP) of 3.907 V. The calculation is useful to determine specific heat generation of this cell chemistry and design. The E(TP) value includes heat generation by electrochemical cell reactions, competitive chemical reactions, and resistance heating at the tabs, connectors, and leads. Heat flow was measured while applying electrical loads to the cell in an isothermal calorimeter set at 0, 20, and 60 C.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: In: Primary and secondary lithium batteries (A93-37355 14-25); p. 42-50.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Arcus: The X-Ray Grating Spectrometer Explorer (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Arcus will be proposed to the NASA Explorer program as a free-flying satellite mission that will enable high-resolution soft X-ray spectroscopy (8-50 Angstroms) with unprecedented sensitivity-effective areas of greater than 500 sq cm and spectral resolution greater than 2500. The Arcus key science goals are (1) to determine how baryons cycle in and out of galaxies by measuring the effects of structure formation imprinted upon the hot gas that is predicted to lie in extended halos around galaxies, groups, and clusters, (2) to determine how black holes influence their surroundings by tracing the propagation of out-flowing mass, energy and momentum from the vicinity of the black hole out to large scales and (3) to understand how accretion forms and evolves stars and circumstellar disks by observing hot infalling and outflowing gas in these systems. Arcus relies upon grazing incidence silicon pore X-ray optics with the same 12m focal length (achieved using an extendable optical bench) that will be used for the ESA Athena mission. The focused X-rays from these optics will then be diffracted by high-efficiency off-plane reflection gratings that have already been demonstrated on sub-orbital rocked flights, imaging the results with flight-proven CCD detectors and electronics. The power and telemetry requirements on the spacecraft are modest. The majority of mission operations will not be complex, as most observations will be long (~100 ksec), uninterrupted, and pre-planned, although there will be limited capabilities to observe targets of opportunity, such as tidal disruption events or supernovae with a 3-5 day turnaround. After the end of prime science, we plan to allow guest observations to maximize the science return of Arcus to the community.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN43826 , Space Telescopes and Instrumentation 2016; Edinburgh; United Kingdom|Proceedings of SPIE (ISSN 0277-786X); 9905; 99054M
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Evaluation of mixed solvent electrolytes for ambient temperature secondary lithium cells (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The ethylene carbonate/2-methyltetrahydrofuran (EC/2-MeTHF) mixed-solvent electrolyte has been experimentally found to possess many desirable electrolyte characteristics for ambient-temperature secondary Li-TiS2 cell applications. As many as 300 cycles have been demonstrated, and a cycling efficiency figure-of-merit of 38.5 percent, for 10-percent EC/90-percent MeTHF mixed-solvent electrolyte in experimental Li-TiS2 cells. The improved performance of this electrolyte is attributable to the formation of a beneficial passivating film on the Li electrode by interaction with the EC.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: International Power Sources Symposium; Jun 13, 1988 - Jun 16, 1988; Cherry Hill, NJ; United States
    Format: text
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    NASA TECHNICAL REPORTS
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