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  • EARTH RESOURCES AND REMOTE SENSING  (7)
  • Karyotyping  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Karyotyping of three Pinaceae species via fluorescent in situ hybridization and computer-aided chromosome analysis (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 411-416 
    Details
    ISSN: 1432-2242
    Keywords: Key words  Pinaceae ; rDNA ; 5S DNA ; FISH ; Karyotyping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract   The positions of 18/25S rRNA genes, 5S RNA genes and of Arabidopsis-type telomeric repeats were localized by fluorescent in situ hybridization (FISH) on the chromosomes of three coniferous species; Picea abies, Larix decidua and Pinus sylvestris, each with 2n=24 chromosomes. Computer-aided chromosome analysis was performed on the basis of the chromosome length, the arm length ratio and the position of the hybridization signals. This enabled the chromosomes of the Norway spruce, 4 chromosomes of the European larch and 3 of the karyotype of the Scots pine to be individually distinguished. With respect to the chromosomal positions of rDNA and 5S rDNA loci, chromosome pair I of P. sylvestris is suggested to be homoeologous to pair II of P. abies, while another chromosome pair of P. sylvestris might be homoeologous to chromosome pair III of L. decidua.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050143
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Karyotyping of three Pinaceae species via fluorescent in situ hybridization and computer-aided chromosome analysis (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 411-416 
    Details
    ISSN: 1432-2242
    Keywords: Pinaceae ; rDNA ; 5S DNA ; FISH ; Karyotyping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The positions of 18/25S rRNA genes, 5S RNA genes and of Arabidopsis-type telomeric repeats were localized by fluorescent in situ hybridization (FISH) on the chromosomes of three coniferous species; Picea abies, Larix decidua and Pinus sylvestris, each with 2n=24 chromosomes. Computer-aided chromosome analysis was performed on the basis of the chromosome length, the arm length ratio and the position of the hybridization signals. This enabled the chromosomes of the Norway spruce, 4 chromosomes of the European larch and 3 of the karyotype of the Scots pine to be individually distinguished. With respect to the chromosomal positions of rDNA and 5S rDNA loci, chromosome pair I of P. sylvestris is suggested to be homoeologous to pair II of P. abies, while another chromosome pair of P. sylvestris might be homoeologous to chromosome pair III of L. decidua.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223687
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    Paper (German National Licenses)
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  • 3
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    Radiometric measurements over bare and vegetated fields at 1.4-GHz and 5-GHz frequencies (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N82-22587)
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment; 12; Sept
    Format: text
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  • 4
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    A multi-frequency radiometric measurement of soil moisture content over bare and vegetated fields (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An experiment on soil moisture remote sensing was conducted during July to September 1981 on bare, grass, and alfalfa fields at frequencies of 0.6, 1.4, 5.0, and 10.6 GHz with radiometers mounted on mobile towers. The results confirm the frequency dependence of sensitivity reduction due to the presence of vegetation cover. For the type of vegetated fields reported here, the vegetation effect is appreciable even at 0.6 GHz. Measurements over bare soil show that when the soil is wet, the measured brightness temperature is lowest at 5.0 GHz and highest at 0.6 GHz, a result contrary to the expectation based on the estimated dielectric permittivity of soil-water mixtures and the current radiative transfer model in that frequency range.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Geophysical Research Letters; 9; Apr. 198
    Format: text
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  • 5
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    Microwave radiometer experiment of soil moisture sensing at BARC test site during summer 1981 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Soil moisture was measured by truck mounted microwave radiometers at the frequencies of 1.4 GHz, 5 GHz, and 10.7 GHz. The soil textures in the two test sites were different so that the soil type effect of microwave radiometric response could be studied. Several fields in each test site were prepared with different surface roughnesses and vegetation covers. Ground truth on the soil moisture, temperature, and the biomass of the vegetation was acquired in support of the microwave radiometric measurements. Soil bulk density for each of the fields in both test sites was sampled. The soils in both sites were measured mechanically and chemically. A tabulation of the measured data is presented and the sensors and operational problems associated with the measurements are discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-86056 , NAS 1.15:86056
    Format: application/pdf
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  • 6
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    L band push broom microwave radiometer: Soil moisture verification and time series experiment Delmarva Peninsula (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The verification of a multi-sensor aircraft system developed to study soil moisture applications is discussed. This system consisted of a three beam push broom L band microwave radiometer, a thermal infrared scanner, a multispectral scanner, video and photographic cameras and an onboard navigational instrument. Ten flights were made of agricultural sites in Maryland and Delaware with little or no vegetation cover. Comparisons of aircraft and ground measurements showed that the system was reliable and consistent. Time series analysis of microwave and evaporation data showed a strong similarity that indicates a potential direction for future research.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10084 , NASA-TM-86068 , NAS 1.15:86068
    Format: application/pdf
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  • 7
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    System calibration of the 1.4 GHz and 5 GHz radiometers for soil moisture remote sensing (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two microwave radiometers at the frequencies of 1.4 GHz and 5 GHz were mounted on a mobile tower and used for a remote sensing of soil moisture experiment at a Beltsville Agriculture Research Center test site. The experiment was performed in October 1979 over both bare field and fields covered with grass, soybean, and corn. The calibration procedure for the radiometer systems which forms the basis of obtaining the final radiometric data product is described. It is estimated from the calibration results that the accuracy of the 1.4 GHz radiometric measurements is about + or - 3 K. The measured 5 GHz brightness temperatures over bare fields with moisture content greater than 10 percent by dry weight are about 8 K lower than those taken simultaneously at 1.4 GHz. This could be due to either (1) a 5 GHz antenna side lobe seeing the cold brightness of the sky, or (2) the thermal microwave emission from a soil being less sensitive to surface roughness at 5 GHz than at 1.4 GHz.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-82043
    Format: application/pdf
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  • 8
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    A multi-frequency radiometric measurement of soil moisture content over bare and vegetated fields (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A USDA Beltsville Agricultural Research Center site was used for an experiment in which soil moisture remote sensing over bare, grass, and alfalfa fields was conducted over a three-month period using 0.6 GHz, 1.4 GHz, and 10.6 GHz Dicke-type microwave radiometers mounted on mobile towers. Ground truth soil moisture content and ambient air and sil temperatures were obtained concurrently with the radiometric measurements. Biomass of the vegetation cover was sampled about once a week. Soil density for each of the three fields was measured several times during the course of the experiment. Results of the radiometric masurements confirm the frequency dependence of moisture sensing sensitivity reduction reported earlier. Observations over the bare, wet field show that the measured brightness temperature is lowest at 5.0 GHz and highest of 0.6 GHz frequency, a result contrary to expectation based on the estimated dielectric permittivity of soil water mixtures and current radiative transfer model in that frequency range.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10238 , NASA-TM-83842 , SM-G1-04178 , NAS 1.15:83842
    Format: application/pdf
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  • 9
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    Radiometric measurements over bare and vegetated fields at 1.4 GHz and 5 GHz frequencies (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Microwave emission from bare and vegetated fields was measured with dual polarized radiometers at 1.4 GHz and 5 GHz frequencies. The measured brightness temperatures over bare fields are shown to compare favorably with those calculated from radiative transfer theory with two constant parameters characterizing surface roughness effect. The presence of vegetation cover is found to reduce the sensitivity to soil moisture variation. This sensitivity reduction is generally pronounced the denser, the vegetation cover and the higher the frequency of observation. The effect of vegetation cover is also examined with respect to the measured polarization factor at both frequencies. With the exception of dry corn fields, the measured polarization factor over vegetated fields is found appreciably reduced compared to that over bare fields. A much larger reduction in this factor is found at 5GHz than at 1.4GHz frequency.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10110 , NASA-TM-82151 , NAS 1.15:82151 , SM-G1-04113
    Format: application/pdf
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