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  • 1
    Electronic Resource
    Electronic Resource
    Allozyme variation among Brazilian and U.S. populations of Rhyzopertha dominica resistant to insecticides (1997)
    Springer
    Entomologia experimentalis et applicata 84 (1997), S. 49-57 
    Details
    ISSN: 1570-7458
    Keywords: allozymes ; genetic variation ; Rhyzopertha dominica ; Brazil ; USA ; insecticide resistance ; Coleoptera ; Bostrichidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The lesser grain borer (Rhyzopertha dominica (F.)) is an important pest of stored grain in many parts of the world (Paleartic, Ethiopian, Oriental, Australian, Neotropical, and Neartic regions) with the ability to fly long distances. These insects have been shown to be resistant to organophosphorus insecticides in several studies. Polyacrylamide gel electrophoresis was used to assess the genetic variability within and among eight Brazilian and seven United States populations of R. dominica and to determine how insecticide resistance may be spreading within both countries. Significant variation in allele frequency among populations was observed at all six polymorphic enzyme loci that were examined. The Brazilian and U.S. populations were genetically differentiated from one another; populations within the U.S. and those within Brazil were also differentiated from one another. The mean genetic similarity among the seven U.S. populations collected in a small region in northeast Kansas was smaller than that among eight Brazilian populations collected in a relatively large geographical area. These results are consistent with the resistance ratios to chlorpyriphos-methyl in R. dominica populations from Brazil and the U.S. and the information available concerning patterns of flight activity in this insect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003018305244
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  • 2
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    Stellar observations with the Voyager EUV objective grating spectrograph (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: During the periods of interplanetary cruise the Voyager ultraviolet spectrometers are used to provide unique and otherwise unobtainable observations in the extreme ultraviolet (EUV, 500 to 1200) and the far ultraviolet (FUV, 912 to 1220 A). These observations include the spectra of hot stellar sources as well as emission from the interplanetary medium. Recent results of note include: (1)Extensive spectrophotometric coverage of a superoutburst of the dwarf nova VW Hydri, which showed a clear 1/2 day delay in the outburst at 1000 A relative to that observed in the optical and a curious dip in the FUV light curve near maximum light. The Voyager observations were part of a comprehensive and highly successful campaign involving EXOSAT, IUE and ground based observations of this dwarf nova; (2)A comprehensive study of Be star spectra and variability. These results show the critical importance of FUV observations in the study of the effects of stellar rotation in hot stars; (3)The detection of a strong O VI absorption feature in the spectrum of the PG 1159-like object H1504+65. This detection along with the optical identification of weak O IV lines was a key to the interpretation of this object; which is of extremely high (〉150,000K) temperature and appears to be a unique example of a stellar atmosphere devoid of H and He; (4)An analysis of an extremely long duration spectrum of the EUV and FUV sky background, which establishes important new upper limits on both continuum and line emission. This result also provide the first detection of interplanetary Lyman gamma.
    Keywords: ASTRONOMY
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 148-149
    Format: text
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  • 3
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    A catalog of blue and red supergiants in M33 (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We present a catalog of blue and red stars in M33 based on photographic photometry of over 65,000 objects extracted from plates taken with the 3.6 m Canada-France-Hawaii Telescope (CFHT) and the 2.0 m Rozhen (Bulgarian) Telescope. The completeness limit of the various surveys are estimated here to be V = 19.5 mag for those stars situated in crowded associations, and V = 20.0 mag for stars in the interarm fields. We list magnitudes and positions for 2112 blue stars, defined by (U - V) less than 0.0 mag, (U - B) less than 0.0 mag, and V less than 19.5 mag, and 389 red stars defined by (B - V) greater than 1.8 mag and V less than 19.5 mag. Of these, 1156 are candidate O stars on the basis of (U - V) less than -0.9 mag.
    Keywords: ASTRONOMY
    Type: The Astrophysical Journal Supplement Series (ISSN 0067-0049); 89; 1; p. 85-122
    Format: text
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  • 4
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    Revised coordinates for 373 selected objects in the Southern Galaxy Catalogue (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Improved positions have been determined for 373 galaxies listed in the Southern Galaxy Catalogue of Corwin et al. (1985) as having poor coordinates. The revised coordinates are expected to be good to 6 arcsec (rms) in each coordinate.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 101; 360-365
    Format: text
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  • 5
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    A digitized version of the NLTT Catalogue of proper motions (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An optically scanning data-entry machine and various manual techniques are used to digitize the NLTT Catalogue and the first supplement to the NLTT Catalogue. Included in the catalog are stars found on over 800 Palomar proper-motion survey plates to have relative annual proper motions exceeding 0.18 arcsec. The supplement contains data for 398 stars having motions larger than 0.179 arcsec annually.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 97; 1480-148
    Format: text
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  • 6
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    Prospect of space-based interferometry at EUV and soft X-ray wavelengths (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: We review the current capabilities of high-resolution, spectroscopic, space-borne instrumentation available for both solar and stellar observations in the EUV and soft X-ray wavelength regimes, and describe the basic design of a compact, all-reflection interferometer based on the spatial heterodyne technique; this is capable of producing a resolving power (lambda/Delta-lambda) of about 20,000 in the 100-200 A region using presently available multilayer optical components. Such an instrument can be readily constructed with existing technology. Due to its small size and lack of moving parts, it is ideally suited to spaceborne applications. Based on best estimates of the efficiency of this instrument at soft X-ray wavelengths, we review the possible use of this high-resolution interferometer in obtaining high-resolution full-disk spectroscopy of the sun. We also discuss its possible use for observations of diffuse sources such as the EUV interstellar background radiation.
    Keywords: ASTRONOMY
    Type: In: Multilayer and grazing incidence X-ray(EUV optics; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39658 15-74); p. 108-116.
    Format: text
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  • 7
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    Ground-based photometric measurements (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Resolution in space, time, magnetic field strength, intensity variance, and wavelength all are used to isolate the signals from sunspots, plage, network, and nonmagnetic areas. Ground data has demonstrated the dominance of sunspots in causing irradiance variance on time scales of hours to months, the near balance of spot deficit and facular excess emission, and the low level of irradiance variation caused by nonmagnetic regions. Present techniques limit the accuracy of comparison with direct irradiance measures, and improvements should be made. Goals for ground-based photometry for the next cycle are suggested.
    Keywords: ASTRONOMY
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  • 8
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    Extreme-UV and far-UV observations of the white dwarf HZ 43 from Voyager 2 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 242
    Format: text
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  • 9
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    The guide star catalog (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Part 1 of the catalog presents an astronomical overview of the Guide Star Catalog, together with its history, the properties of its current implementation, and the prospects for enhancement. Part 2 presents the algorithms used in photometric and astrometric calibration of the catalog, as well as the analyses of the related errors. Part 3 presents the current structure and content, as well as future enhancements in this area. An overview of the forthcoming publications is given, both with regard to scientific papers and electronic media.
    Keywords: ASTRONOMY
    Type: NASA-CR-183253 , NAS 1.26:183253 , PPS-187
    Format: application/pdf
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  • 10
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    Resolved stars in nearby galaxies: Ground-based photometry of M81 (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Using the Canada-France-Hawaii Telescope (CFHT) we have obtained three closely spaced epochs of calibrated Blue Violet Red Infrared (BVRI) CCD imaging of two fields in M81, each known to contain a thirty-day Cepheid. Calibrated BVRI photometry of the brightest stars in these fields is presented. The slope of the luminosity function from the brightest 3-4 mag of the main-sequence blue plume is consistent with similar determinations of the apparent luminosity function in other resolved galaxies, thereby removing the one potential deviation from universality noted by Freedman in a photographic study of luminosity functions in nearby resolved galaxies. Under the assumption that the two Cepheids are representative, a reddening-law fit to the multiwavelength BVRI period-luminosity moduli give a true distance modulus of (m-M)sub 0 = 27.79 mag for M81, corresponding to a linear distance of 3.6 Mpc. An error analysis shows that the derived true distance modulus has a random error of +/- 0.28 mag (due to the photometric uncertainties in the BVRI data), with a systematic uncertainty of +/- 0.10 mag (accounting for the combined effects of unknown phasing of the data points, and the unknown positioning of these particular stars within the Cepheid instabiliy strip).
    Keywords: ASTRONOMY
    Type: The Astronomical Journal (ISSN 0004-6256); 106; 6; p. 2243-2251
    Format: text
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