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  • INSTRUMENTATION AND PHOTOGRAPHY  (6)
  • Isoptera  (4)
  • GEOPHYSICS  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Chemical heterogeneity of soldier defensive secretions in the desert subterranean termite, Amitermes wheeleri
    Amsterdam : Elsevier
    Biochemical Systematics and Ecology 14 (1986), S. 661-664 
    Details
    ISSN: 0305-1978
    Keywords: Amitermes wheeleri ; Isoptera ; Termitidae ; chemosystematics ; defensive secretions ; intraspecific variation ; sesquiterpenoids ; termite soldiers
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-1978(86)90049-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Soldier defensive secretions of two rare nearctic desert termite species
    Amsterdam : Elsevier
    Biochemical Systematics and Ecology 16 (1988), S. 213-216 
    Details
    ISSN: 0305-1978
    Keywords: 4,11-epoxy-cis-eudesmane ; Amitermes coachellae ; Amitermes emersoni ; Amitermitinae ; Isoptera ; Termitidae ; biogeography ; phylogeny ; soldier defensive secretions ; terpenes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-1978(88)90099-3
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  • 3
    Electronic Resource
    Electronic Resource
    Drywood termite feeding deterrents in sugar pine and antitermitic activity of related compounds (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 39-55 
    Details
    ISSN: 1573-1561
    Keywords: Feeding deterrents ; drywood termites ; Incisitermes minor ; Isoptera ; Kalotermitidae ; sugar pine ; Pinus lambertiana ; fatty acids α-halogenated acids ; esters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The feeding deterrent activity of sapwood extracts of sugar pine,Pinus lambertiana Dougl., and related compounds was determined against immatures of the western drywood termite,Incisitermes minor (Hagen). A bioassay was designed to quantify reductions in termite feeding caused by deterrent chemicals. Crude extracts and isolated fractions of sugar pine were deterrent and not preferred byI. minor at 0.5 mg/cm2. Fatty acids occurring in sugar pine extracts had a broad range of deterrent activity. Long-chain saturated fatty acids were deterrent at 0.25 and 0.05 mg/cm2. Unsaturated or intermediate length (C8-C14) acids, many not found in sugar pine wood, were less active than long-chain saturated acids. Related alpha-halogenated compounds were highly deterrent at 0.05 mg/cm2 regardless of chain length or presence of a carboxylic acid moiety. Deposits of 2-iodooctadecanoic acid reduced termite feeding at 5 μg/cm2, while 2-bromooctadecanoic acid had deterrent activity comparable to commercial wood preservatives. None of the halogenated compounds tested were termiticidal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987769
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of the defensive secretion from soldiers of the North American termite,Amitermes wheeleri (Desneux) (Isoptera: Termitidae) (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 1293-1305 
    Details
    ISSN: 1573-1561
    Keywords: Amitermes wheeleri ; Isoptera ; Termitidae ; termite soldiers ; defensive secretion ; ant repellents ; α-bisabolene ; β-bisabolene ; α2-bisabolene ; Iridomyrmex humilis ; Pogonomyrmex rugosus ; sesquiterpenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Head capsule extracts ofAmitermes wheeleri soldiers yielded an isomeric mixture (67 μg/ soldier) of three sesquiterpene hydrocarbons identified by EIMS, [13C]-, and [1H]NMR as (+)-(S,Z)-α-bisabolene (53%), (+)-(R)-β-bisabolene (16%), and (−)-(Z)-α2-bisabolene (31%). When alarmed, the termite soldiers secreted the fluid onto the head surface surrounding the efferent pore of the frontal gland reservoir. A defensive function for the soldier secretion was indicated by the avoidance behavior displayed toward alarmed soldiers by the antagonistic ants,Pogonomyrmex rugosus andIridomyrmex humilis. Laboratory studies demonstrated that the sesquiterpene mixture is repellent to foragingI. humilis workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994798
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  • 5
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    The solar magnetograph of the high altitude observatory. (1965)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Solar magnetograph to measure magnetic field intensities in solar prominences, utilizing H- alpha emission line
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 6
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    The Stable Solar Analyzer (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Progress in the development of an instrument with very high (1:10 billion) wavelength stability designed to measure solar surface velocities and magnetic fields is reported. The instrument determines Doppler and Zeeman shifts in solar spectral lines by a 6-point weighted average. It is built around an electrically tunable solid lithium-niobate Fabry-Perot etalon that is stabilized against a diode laser which itself is locked to a resonance line of cesium 133. Key features are the etalon, which acts as a wide-angle 0.017-nm solar filter, the camera with a specially stabilized shutter, and the instrument control and data collection system. Use of the instrument in helioseismological research is emphasized.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ESA, Seismology of the Sun and Sun-Like Stars; p 227-233
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  • 7
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    Some design considerations for a satellite-borne magnetograph (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design criteria for a compact magnetograph that can monitor solar magnetic fields from a free-flying satellite for 5 to 10 years are reviewed. The signal-to-noise ratio that can be obtained with a 10-cm f/10 refractor operated with a Fabry-Perot filter and a solid-state detector array is derived. The telescope measures the longitudinal component of the magnetic field for the entire solar disk in a few minutes at a 20-G threshold and at 3-arcsec resolution. The Fabry-Perot filter has a lithium niobate etalon, which can be tuned electrically and operated at a fixed tilt angle in such a manner that it cancels the solar rotational Doppler shifts in the transmitted spectrum. Principles of operation of various types of polarization modulators are presented, and it is concluded that photoelastic modulators and liquid-crystal devices hold the most promise for use in a satellite-borne magnetograph,
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields; p 141-152
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  • 8
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    A tunable, solid, Fabry-Perot etalon for solar seismology (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A solid etalon has been designed and fabricated from a 50-mm diameter wafer of optical-quality lithium niobate. The finished etalon has a free spectral range of 0.325 nm at 588 nm. The parallel faces are coated with silver, and the central 15-mm aperture of the etalon has a finesse of 18.6. The reflective faces double as electrodes, and application of voltage will shift the passband. This feature was used in a servo circuit to stabilize the passband against temperature and tilt-induced drifts to better than three parts in one billion. Operated in the stabilized mode for day-long sessions, this filter alternately samples the wings of a narrow atomic absorption line in the solar spectrum and produces a signal proportional to velocity on the solar disk. The Fourier transform of this signal yields information on acoustic waves in the solar interior.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 9
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    A fractal analysis of quaternary, Cenozoic-Mesozoic, and Late Pennsylvanian sea level changes (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sea level changes are related to both climatic variations and tectonic movements. The fractal dimensions of several sea level curves were compared to a modern climatic fractal dimension of 1.26 established for annual precipitation records. A similar fractal dimension (1.22) based on delta(O-18/O-16) in deep-sea sediments has been suggested to characterize climatic change during the past 2 m.y. Our analysis indicates that sea level changes over the past 150,000 to 250,000 years also exhibit comparable fractal dimensions. Sea level changes for periods longer than about 30 m.y. are found to produce fractal dimensions closer to unity and Missourian (Late Pennsylvanian) sea level changes yield a fractal dimension of 1.41. The fact that these sea level curves all possess fractal dimensions less than 1.5 indicates that sea level changes exhibit nonperiodic, long-run persistence. The different fractal dimensions calculated for the various time periods could be the result of a characteristic overprinting of the sediment recored by prevailing processes during deposition. For example, during the Quaternary, glacio-eustatic sea level changes correlate well with the present climatic signature. During the Missourian, however, mechanisms such as plate reorganization may have dominated, resulting in a significantly different fractal dimension.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; B12; p. 21963-21967
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  • 10
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    A four parameter E vs dE/dx and time-of- flight computerized charged particle experiment. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Computerized solid state charged particle used in dE/dx telescope configuration
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NUCLEAR SCIENCE SYMPOSIUM; Oct 31, 1967 - Nov 02, 1967; LOS ANGELES, CA|; INESE JOURNAL OF PHY
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