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  • 1
    Electronic Resource
    Electronic Resource
    Water-soluble proteins of mature barley endosperm: genetic control, polymorphism, and linkage with β-amylase and spring/winter habit (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 787-792 
    Details
    ISSN: 1432-2242
    Keywords: Water-soluble protein (WSP) ; Barley ; β Amylase ; Linkage ; Spring/winter habit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Water-soluble proteins (WSP-2 and WSP-3) and β-amylase (β-AMY-1) were extracted from mature endosperms of 44 spring and 39 winter barley genotypes. The protein and enzyme isoforms were separated in isoelectric focusing gels with a pH gradient of 4–6.5. The Wsp-3 and β-Amy-1 loci were located to chromosomes 4H using the wheat/barley chromosome addition lines. Segregation analysis of F2 and doubled haploid populations showed Wsp-2 and β-Amy-1 to be tightly linked, with a map distance of 11 cMorgans. Isoforms of WSP-2 possessed similar pIs to that of WSP-3 and overlapping bands were observed in the gels. These bands segregated independently in F2 and doubled haploid populations, implying two unlinked genes. All three loci were found to be polymorphic: two alleles were detected at the Wsp-2 locus, three at Wsp-3 and two at β-Amy-1. The frequency of alleles at all three loci was found to be different in winter and spring genotypes. Spring genotypes possessed a wider range of phenotypes than winter genotypes. Spring and winter genotypes could be distinguished on the basis of WSP-3 and β- AMY-1 phenotypes. The linkage between Wsp-3 and β-Amy-1 loci and genes controlling spring/winter habit on chromosome 4H is discussed. It is concluded that Wsp-3 and β-Amy-1 can be used as genetic markers for spring/winter habit in barley genetic research and breeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224991
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  • 2
    Electronic Resource
    Electronic Resource
    The inheritance of genetic markers in microspore-derived plants of barley Hordeum vulgare L. (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 487-492 
    Details
    ISSN: 1432-2242
    Keywords: Doubled haploids ; Microspore ; Isozymes ; RFLPs ; Barley
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Biochemical, molecular and morphological markers have been used to monitor the segregation of alleles at major gene loci in microspore-derived lines of four spring barley crosses and their parents. Significant deviations from the expected Mendelian ratios were observed for four of the ten markers studied in the cross. Distorted ratios were associated with loci located on chromosomes 4H and 6H. The differential transmission of alleles was in favour of the responsive parent (Blenheim) used in the anther culture studies. For the α-Amy-1 locus on chromosome 6H, the preferential transmission of Blenheim alleles was most pronounced in the haploid regenerants that were colchicine treated. These results are discussed in relation to the genetic control of androgenetic response in barley and with respect to the exploitation of another culture in barley improvement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219438
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  • 3
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    Europa's phase curve - Implications for surface structure (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The surface of the Jovian satellite Europa is characterized on the basis of an analysis of ground photoelectric photometry at 470 and 550 nm and Voyager images. The data are presented in extensive tables and graphs and discussed in detail. At 550 nm, Europa has single-scattering albedo 0.964, opposition-effect amplitude 0.5, opposition-effect width 0.0016, double-lobed Henyey-Greenstein factors b = -0.429 and c = 0.113, and mean roughness angle 10 deg (much lower than on other solar-system objects). From the small roughness and the 96-percent porosity implied by the narrow opposition peak, it is concluded that the surface was formed mainly by endogenic processes. It is also noted that only one of three observational criteria for preferential ion bombardment of the trailing hemisphere are met in Europa.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 90; 30-42
    Format: text
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  • 4
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    UBV photometry of asteroid 433 Eros (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: UBV observations of asteroid 433 Eros were conducted on 17 nights during the winter of 1974/75. The peak-to-peak amplitude of the lightcurve varied from about 0.3 mag to nearly 1.4 mag. The absolute V mag at maximum light, extrapolated to zero phase, is 10.85. Phase coefficients of 0.0233 mag/degree, 0.0009 mag/degree, and 0.0004 mag/degree were derived for V, B-V and U-B, respectively. The zero-phase color of Eros (B-V = 0.88, U-B = 0.50) is representative of an S (silicaceous) compositional type asteroid. The color does not vary with rotation. The photometric behavior of Eros can be modeled by a cylinder with rounded ends having an axial ratio of about 2.3:1. The asteroid is rotating about a short axis with the north pole at 15 deg ecliptic longitude and 9 deg ecliptic latitude.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 28; May 1976
    Format: text
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  • 5
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    A search for posteclipse brightening of Io in 1973. I (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Eight eclipse reappearances of the innermost Galilean satellite, Io, were observed during the fall of 1973. The measurements were made using photometers specially designed to cope with the problem of scattered light from Jupiter. Posteclipse brightening of Io was not detected and, if present, was less than our estimated detection threshold of about 0.02 mag.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Nov. 197
    Format: text
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  • 6
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    UBV photometry of the Galilean satellites (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: UBV observations of the Galilean satellites made at Lowell Observatory and Cerro Tololo Inter-American Observatory during 1973 and 1974 are reported. The dependence of brightness on solar phase angle for various faces of each satellite is determined. Significant differences in this dependence are found between different faces of the same satellite, between satellites, and between the present results and those of previous investigators. Rotational light and color-index curves are presented for the satellites and compared with earlier work. An apparent secular brightening of all four satellites between 1973 and 1974 is discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 26; Dec. 197
    Format: text
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  • 7
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    International planetary patrol observations of Saturn's rings. II - Four color phase curves and their analysis (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: New phase curves for Saturn's rings at an intermediate tilt angle B of about 17 deg are presented. Quantitative results for each of the A and B rings are reported in terms of the opposition effect, phase coefficient, and best logarithmic fit to the phase curve. There was no significant difference between the shape of the phase curves for the two rings in each of the four colors, and a four-parameter multiple scattering model of the rings was consistent with the observations. In this model, the difference in the phase curves for different colors can be explained by a variation in the single scattering albedo with wavelength. The observations allow the particles to have the same composition in the A and B rings, so that their different photometric behavior is explained by differences in optical depth and volume density in the two rings.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomical Journal; 84; Sept
    Format: text
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  • 8
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    Origin of longitudinal grooving in Tiu Vallis, Mars - Isolation of responsible fluid-types (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Fluid instability analysis developed for the growth or decay of large, longitudinal roller vortex perturbations imposed at the base of fluids of exponentially stratified viscosities is presented. The origin of longitudinal grooving and fluting in a region of converging flow in Tiu Vallis, Mars, is analyzed, and the propensity of fluids, such as water, mudflow/debris flow, and lava, to develop longitudinal roll patterns as part of their flow field is tested. It is found that the grooving pattern in Tiu Vallis was probably formed by vortex motion in a mudflow or debris-laden slurry, but exact representation of sediment/debris concentration or sediment transport machanism is not yet possible. It is concluded that longitudinal vortex motion modelled in this analysis can develop in water, lava, or ice, but that the specific flow characteristics of these models which include the vortex motion are unreasonable for flow in Tiu Vallis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 6; Sept
    Format: text
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  • 9
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    An atmospheric outburst on Neptune from 1986 through 1989 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Visual photometry and methane-band imaging indicate that Neptune underwent a period of atmospheric activity in the 1986-1989 period with an enhancement of 8900 A CH4-band brightness and an increased standard deviation of the mean yearly magnitudes at visual and near-IR wavelengths. These observations are presently interpreted as due to a localized upwelling source that could be similar to the 'great white spots' that have been periodically observed on Saturn.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 99; 2; p. 363-367.
    Format: text
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  • 10
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    The albedo of Titan (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Photometric observations of Titan since 1972 show a cyclical variation of about 10 percent. A minimum value of brightness and albedo apparently occurred in 1984. Spectrophotometric observations, made annualy since 1980 at 8 A resolution, 3295-8880 A, were used to derive the value p-asterisk = 0.156 + or - 0.010 for the integrated geometric albedo in 1984. Variations of the equivalent widths of spectral features were not seen.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 303; 511-520
    Format: text
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