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  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR  (4)
  • Meteorology and Climatology  (2)
  • Grass  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen-15 partitioning within a three generation tiller sequence of the bunchgrass Schizachyrium scoparium: response to selective defoliation (1987)
    Springer
    Oecologia 74 (1987), S. 330-334 
    Details
    ISSN: 1432-1939
    Keywords: 15N partitioning ; Herbivory ; Grass ; Schizachyrium scoparium ; Nitrogen allocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Nitrogen partitioning among three generations of tillers within the bunchgrass Schizachyrium scoparium var. frequens was investigated in a controlled environment as a potential mechanism of herbivory tolerance. Nitrogen-15 was transported from the labelled primary tiller generation to both shoots and roots of nondefoliated secondary and tertiary tiller generations within 24 h. Partial defoliation increased shoot nitrogen concentration of secondary and tertiary generation tillers by 110 and 120%, respectively, 24 h following defoliation. Shoot nitrogen concentration was preferentially increased by partial defoliation of tertiary generation tillers throughout the 120 h experimental period, but diminished to concentrations comparable to nondefoliated tillers within shoots of the secondary generation at 72 h. In contrast to nitrogen concentration, the total amount of nitrogen imported by secondary and tertiary generation tillers decreased 62 and 73%, respectively, 24 h following partial defoliation and did not attain values comparable to respective nondefoliated tillers. Consequently, preferential nitrogen concentration occurred in response to partial tiller defoliation without an increase in total nitrogen import based on the reduction in the total nitrogen requirement per tiller generation associated with defoliation. Estimates of both the total amount of nitrogen import and nitrogen concentration are necessary to accurately interpret the dynamics of intertiller nitrogen allocation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378925
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Classical calculations of charge-transfer cross sections. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Gryzinski procedure for estimating charge transfer cross sections, discussing Coulomb collision
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Classical approximation for ionization by proton impact. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Atomic ionization by proton impact predicted by classical binary encounter approximation compared to experimental data, discussing ionization cross sections
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Critical Climate-Sensitive and Important Grain-Producing Regions: Grain Production/Yield Variations Due to Climate Fluctuations (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Ideally, the Crop Country Inventory, CCI, is a methodology for the pre-harvest prediction of large variations in a country s crop production. This is accomplished by monitoring the historical climatic fluctuations, especially during the crop calendar period, in a climate sensitive large crop production region or sub-country, rather than the entire country. The argument can be made that the climatic fluctuations in the climatic sensitive region are responsible for the major annual crop country variations and that the remainder of the country, without major climatic fluctuations for a given year, can be assumed to be a steady-state crop producer. The principal data set that has been used is the Global Climate Mode (GCM) data from the National Center for Environmental Prediction (NCEP), taken over the last half century. As a test of its accuracy, GCM data can and has been correlated with the actual meteorological station data at the station site.
    Keywords: Meteorology and Climatology
    Type: NASA/TM-2004-212252/VOL1 , Rept- 2005-00563-0/VOL1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Late-Glacial to Late-holocene Shifts in Global Precipitation Delta(sup 18)O (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Reconstructions of Quaternary climate are often based on the isotopic content of paleo-precipitation preserved in proxy records. While many paleo-precipitation isotope records are available, few studies have synthesized these dispersed records to explore spatial patterns of late-glacial precipitation delta(sup 18)O. Here we present a synthesis of 86 globally distributed groundwater (n 59), cave calcite (n 15) and ice core (n 12) isotope records spanning the late-glacial (defined as 50,000 to 20,000 years ago) to the late-Holocene (within the past 5000 years). We show that precipitation delta(sup 18)O changes from the late-glacial to the late-Holocene range from -7.1% (delta(sup 18)O(late-Holocene) 〉 delta(sup 18)O(late-glacial) to +1.7% (delta(sup 18)O(late-glacial) 〉 delta(sup 18)O(late-Holocene), with the majority (77) of records having lower late-glacial delta(sup 18)O than late-Holocene delta(sup 18)O values. High-magnitude, negative precipitation delta(sup 18)O shifts are common at high latitudes, high altitudes and continental interiors.
    Keywords: Meteorology and Climatology
    Type: GSFC-E-DAA-TN27470 , Climate of the Past; 11; 10; 1375-1393
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Classical calculations of charge transfer cross sections (1967)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Calculations of charge transfer cross sections
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-81433 , INTERN. CONF. ON THE PHYS. OF ELECTRON. AND ATOMIC COLLISIONS; Jul 17, 1967 - Jul 23, 1967; LENINGRAD
    Format: application/pdf
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  • 7
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    Classical approximation for ionization by heavy particle impact (1966)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Classical binary approximation for ionization by proton impact
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-81435 , INTERN. CONF. ON THE PHYS. OF ELECTRON. AND ATOMIC COLLISIONS; Jul 17, 1967 - Jul 23, 1967; LENINGRAD
    Format: application/pdf
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