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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • GEOPHYSICS  (2)
  • Isoptera  (2)
  • Animals  (1)
  • 1980-1984  (6)
  • 1970-1974  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Feeding deterrents ; drywood termites ; Incisitermes minor ; Isoptera ; Kalotermitidae ; sugar pine ; Pinus lambertiana ; fatty acids α-halogenated acids ; esters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00987769
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Amitermes wheeleri ; Isoptera ; Termitidae ; termite soldiers ; defensive secretion ; ant repellents ; α-bisabolene ; β-bisabolene ; α2-bisabolene ; Iridomyrmex humilis ; Pogonomyrmex rugosus ; sesquiterpenes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00994798
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    facet.materialart.
    Unbekannt
    Ruminant methane delta(13C/12C) values: relation to atmospheric methane (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1981-03-06
    Beschreibung: The delta(13C/12C)--values of methane produced by fistulated steers, dairy cattle, and wethers, and dairy and beef cattle herds show a bimodal distribution that appears to be correlated with the plant type (C3 or C4, that is, producing either a three- or a four-carbon acid in the first step of photosynthesis) consumed by the animals. These results indicate that cattle and sheep, on a global basis, release methane with an average delta(13C/12C) value of -60 and -63 per mil, respectively. Together they are a source of atmospheric methane whose delta(13C/12C) is similar to published values for marsh gas and cannot explain the 20 per mil higher values for atmospheric methane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rust, F -- New York, N.Y. -- Science. 1981 Mar 6;211(4486):1044-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7466376" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Atmosphere ; Carbon Isotopes ; Cattle/*metabolism ; Eructation ; Methane/*metabolism ; Sheep/*metabolism
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 4
    facet.materialart.
    Unbekannt
    A project to evaluate moisture stress and phenological factors in corn and soybean areas of southwestern and south-central Minnesota (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2016-03-09
    Beschreibung: The capability of aerial color infrared photography for identifying and locating soilscapes most susceptible to drought development or those having different soil drainages was evaluated. Although west central and southwestern Minnesota had a significant precipitation deficit during the 1980 crop season, indications of plant stress were not observed either from ground observation or through interpretation of imagery at the selected sampling sites. Well-drained soil was more depleted during the "maximium green peak" period than the poorly drained soil. The recharge was more evident on the poorly drained site in the fall. Measurements of leaf water potential and leaf temperature for corn and soybean leaves were made by multispectral band scanner and recorded for analysis.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: A Study of Minn. Land and Water Resources Using Remote Sensing, Vol. 14; 18 p
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unbekannt
    A project to evaluate moisture stress in corn and soybean areas of western and southwestern Minnesota (1980)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Remote sensing techniques, particularly LANDSAT data, were used to assess soil moisture stress through crop signature in southwestern Minnesota. Related objectives were: localization of droughty, well drained, and poorly drained soils; detection of stress from hail, wind, and disease damage; and the use of remote sensing data for agricultural management. Since the amount and distribution of precipitation were adequate during the 1977 and 1978 growing seasons, no significant stress occurred. Crop conditions were very favorable. As a result, crop signatures were too uniform to reflect soilscape variations and crop condition changes. In 1979 precipitation was again adequate to excess, particularly in June and August. In some cases, poorly drained sites especially, stress conditions developed as a result of excess of water and could be identified on color infrared photographs.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Minnesota Univ. A Study of Minn. Land and Water Resources Using Remote Sensing, Vol. 13; p 88-106
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unbekannt
    Application of X-ray imaging techniques to auroral monitoring (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The precipitation of energetic particles into the ionosphere produces bremsstrahlung X-rays and K-alpha line emission from excited oxygen and nitrogen. If viewed from a spacecraft in a highly elliptical polar orbit, this soft (0.3 - 3.0 keV) X-radiation will provide an almost uninterrupted record of dayside and nightside auroras. A grazing incidence X-ray telescope especially designed for such auroral monitoring is described. High photon collection efficiency will permit exposure times of approximately 100 seconds during substorms. Spectrophotometry will allow users to derive the energy spectrum of the precipitating particles. If placed in a 15 earth-radius orbit, the telescope can produce auroral X-ray images with 30 km resolution. Absolute position of X-ray auroras can be established with a small optical telescope co-aligned with the X-ray telescope. Comparison of X-ray and optical images will establish the height and global distribution of X-ray aurorae, relative to well-known optical auroras, thus melding the new X-ray results with knowledge of optical auroras.
    Schlagwort(e): GEOPHYSICS
    Materialart: Symposium on the Effect of the Ionosphere on Radiowave Systems; Apr 14, 1981 - Apr 16, 1981; Washington, DC
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unbekannt
    Application of ERTS-1 imagery to state wide land information system in Minnesota (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): GEOPHYSICS
    Materialart: E74-10682 , NASA-CR-139247
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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