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  • Springer  (86)
  • 2010-2014  (34)
  • 1980-1984  (52)
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  • 1
    Electronic Resource
    Electronic Resource
    The algebraic braid groups are torsion-free: An algebraic proof (1980)
    Springer
    Mathematische Zeitschrift 172 (1980), S. 157-160 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182400
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  • 2
    Electronic Resource
    Electronic Resource
    On the linearity of automorphism groups of free groups (1982)
    Springer
    Archiv der Mathematik 38 (1982), S. 404-409 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304807
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for differences in alpha-adrenergic receptor affinity in stress susceptible swine (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 1343-1344 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary pA2-Values were determined using phentolamine-methoxamine. The mean pA2-value on aortic strips from stress susceptible swine was 7.81 and 7.39 for control. The α-adrenergic receptor from stress susceptible swine has a higher affinity than that of control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954940
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  • 4
    Electronic Resource
    Electronic Resource
    Pulse evolution in injection mode locked TECO2 lasers (1980)
    Springer
    Applied physics 23 (1980), S. 245-251 
    Details
    ISSN: 1432-0630
    Keywords: 42.55 DK ; 42.60 By
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The pulse train evolution in an injection mode locked TECO2 laser has been investigated for a wide range of input pulse widths e.g., ranging from the cavity round-trip time to near the bandwidth-limited value for the system. Regimes in which pulse narrowing and pulse broadening occur have been identified and are discussed. The combined use of injection and saturable-absorber mode-locking techniques has produced reliable subnanosecond pulse trains from a large aperture TEACO2 laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00914907
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  • 5
    Electronic Resource
    Electronic Resource
    Chloroplast DNA variation between species of Triticum and Aegilops. Location of the variation on the chloroplast genome and its relevance to the inheritance and classification of the cytoplasm (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 247-262 
    Details
    ISSN: 1432-2242
    Keywords: Triticum ; Aegilops ; Chloroplast DNA ; Cytoplasmic inheritance ; Wheat evolution ; The B genome donor ; Restriction mapping ; Insertions ; Deletions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Restriction endonuclease analysis revealed interspecific and intraspecific variation between the chloroplast DNAs and therefore between the cytoplasms of 14 selected species of Triticum and Aegilops. Eleven distinct chloroplast DNA types were detected, the differences between them residing in the varied combination of a relatively few DNA alterations. The variation was simple enough for chloroplast DNA analysis to be used as a basis for the identification and classification of the Triticum and Aegilops cytoplasms. There was good agreement with the classification based on analysis of the phenotypic effects of the cytoplasm when combined with the T. aestivum nucleus in nuclear-cytoplasmic hybrids (Tsunewaki et al. 1976). There was however no correlation between specific chloroplast DNA alterations and any of the phenotypic effects known to be associated with specific cytoplasms. Although the diploid species examined included all those which have been suggested as possible donors of the cytoplasm and the B genome to T. aestivum, none of the chosen accessions belonged to the same cytoplasmic class as T. aestivum itself, except that of the tetraploid T. dicoccoides. Therefore, none of the diploid accessions analysed was the B genome donor. The analyses did however support several other suggestions which have been made concerning wheat ancestry. Scoring the different chloroplast DNA types according to the rarity of their banding patterns indicated that four of the eleven cytoplasms are of relatively recent origin. The DNA alterations most easily detectable by the limited comparison of the eleven Triticum/Aegilops chloroplast DNA types using only 4 endonucleases were insertions and deletions. These ranged between approximately 50 bp and 1,200 bp in size and most of them were clustered in 2 segments of the large single-copy region of the genome. Only two examples of the loss of restriction endonuclease sites through possible point mutations were observed. No variation was detected in the inverted repeat regions. Several of the deletions and insertions map close to known chloroplast protein genes, and there is also an indication that the more variable regions of the chloroplast genome may contain sequences which have allowed DNA recombination and rearrangement to occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308076
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  • 6
    Electronic Resource
    Electronic Resource
    Plant-herbivore interactions in a North American mixed-grass prairie (1983)
    Springer
    Oecologia 56 (1983), S. 10-15 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Studies were conducted during the 1979 growing season to examine how North American bison (Bison bison) use prairie dog (Cynomys ludovicianus) colonies in Wind Cave National Park, South Dakota. Objectives included (1) determining whether bison selected for prairie dog towns parkwide; (2) characterizing in greater detail bison use patterns of a 36-ha colony in Pringle Valley as a function of time since prairie dog colonization; and (3) relating these bison use patterns to measured changes in structure and nutritional value of vegetation on and off the dog town. During midsummer, prairie dog towns were one of the most frequently used habitats by bison parkwide. Day-long observations at Pringle Valley revealed that bison exerted strong selection (nearly 90% of all habitat use and feeding time) for the dog town, which occupied only 39% of the valley. While there, they partitioned their use of the colony by grazing in moderately affected areas (occupied 〈8 years by prairie dogs) and by resting in the oldest area (〉26 years occupation). Prairie dogs facilitate bison habitat selection for a shortgrass successional stage in this mixed-grass community by causing a broad array of compositional, structural, and nutritional changes in the vegetation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378211
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  • 7
    Electronic Resource
    Electronic Resource
    Relative growth rates and the grazing optimization hypothesis (1981)
    Springer
    Oecologia 51 (1981), S. 14-18 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A mathematical analysis of the changes in plant relative growth rates necessary to increase aboveground production following grazing was conducted. The equation derived gives an isoline where production of a grazed and ungrazed plant will be the same. The equation has four variables (mean shoot relative growth rate, change in relative growth rate after grazing, grazing intensity, and recovery time) and may be analyzed graphically in a number of ways. Under certain conditions, small increases in shoot relative growth rate following grazing will lead to increased aboveground production. Under other conditions, very large increases in relative growth rate after grazing can occur without production being increased over that of ungrazed plants. Plants growing at nearly their maximum potential relative growth rate have little opportunity to respond positively to grazing and potentially can sustain less grazing than plants with growth rates far below maximum. Plants with high relative growth rates at the time of grazing require large increases in growth rate while slow growing plants require only small increases. High grazing intensities are least likely to increase production and high grazing frequencies require greater responses than infrequent grazing events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344645
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  • 8
    Electronic Resource
    Electronic Resource
    Plant-herbivore interactions: Examination of potential effects of bison saliva on regrowth of Bouteloua gracilis (H.B.K.) lag (1980)
    Springer
    Oecologia 45 (1980), S. 26-31 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Laboratory experiments were performed to determine whether regrowth of blue grama was affected by potential growth-promoting substances in saliva of North American bison. We observed no statistically significant effects of foliar application of whole bison saliva on net photosynthesis (PN), root respiration (RR), allocation patterns of photosynthetically fixed 14C, or regrowth rates over a 10-day period following clipping to various heights. In a 10-week experiment, there were no significant effects of saliva on leaf, crown or root growth or tiller production in plants clipped to heights of 6, 4 or 2 cm above crowns. Similarly, nitrogen-stressed plants failed to show significant changes in growth rates or tillering in response to saliva over a 3-week period. Clipped blue grama plants did exhibit significant compensatory growth responses, including higher PN rates from 3–10 days following clipping and allocation of a higher proportion of current photosynthate to synthesis of new leaf tissue with increasing severity of defoliation. Nevertheless, unclipped plants invariably outproduced clipped plants following defoliation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346702
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  • 9
    Electronic Resource
    Electronic Resource
    Plant-herbivore interactions in a North American mixed-grass prairie (1983)
    Springer
    Oecologia 56 (1983), S. 1-9 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Research was conducted to determine the effects of a native, sedentary rodent of North American grasslands, the black-tailed prairie dog (Cynomys ludovicianus), on seasonal aboveground plant biomass and nutrient dynamics and plant species diversity. The study was done on a northern mixed-grass prairie site at wind Cave National Park, South Dakota. Peak live plant biomass was greatest (190 g/m2) on the uncolonized part of the study area and least (95 g/m2) on a part of the prairie dog town colonized for 3 to 8 y. Peak live plant biomass (170 g/m2) of the oldest portion of the prairie dog town (colonized 〉26 y) was not significantly different from that of uncolonized prairie. However, where-as graminoids composed 〉85% of the total biomass of the latter area, forbs and dwarf shrubs (Artemisia frigida) were 〉95% of the total of the former. Both standing-dead plant biomass and litter declined markedly as time since colonization increased. Total plant species diversity (H) was greatest in the young prairie dog town (colonized for 3 to 8 y). Nitrogen concentration of plant shoots varied significantly as a function of time since colonization. Shoot-nitrogen was lowest in plants from the uncolonized site and greatest in plants collected from the longest-colonized areas of the prairie dog town. Shoot-nitrogen declined significantly over the growing season and tended to be higher in C3 graminoids than in C4 graminoids. In vitro digestible dry matter showed similar trends; the differences between C3 and C4 digestibilities were greatest during the last half of the growing season. We suggest that prairie dog-induced changes in plant biomass, plant species diversity, plant nutrient content, and forage digestibility may lead to further alterations of nutrient cycling and trophic dynamics in this mixed-grass prairie ecosystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378210
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of weak reflections from anti-reflection coated surfaces on CO2 laser optics design (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 327-330 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The influence of interference due to weak reflections from anti-reflection coated surfaces in CO2 laser optics is discussed and analysed. In certain cases quite low reflection levels (∼1%) are shown to lead to uncertainties in the mirror transmission coefficient or produce a non-uniform power loading on the mirror surface, resulting in damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619744
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