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  • Springer  (78)
  • 1980-1984  (52)
  • 1975-1979  (26)
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  • 1
    Electronic Resource
    Electronic Resource
    Separation of eastern spruce and balsam fir by chemical methods (1978)
    Springer
    Wood science and technology 12 (1978), S. 293-308 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Increased utilization of eastern spruce and balsam fir has led to a need for a quick method of separating these woods in a mill situation. One such method might be the use of a chemical indicator. A test of various classes of chemical agents applied at different seasons of the year showed that a pH indicator might be suitable for achieving a separation. The most suitable indicator was tested on samples from different geographic locations and at three highproduction stud mills. Additional tests were conducted to explore such variables as moisture content and surface condition of the wood, type of solvent, concentration and temperature. The most suitable indicator found was bromophenol blue at a concentration of 0.10 percent in 95 percent ethanol. When applied to green wood which had been allowed to dry for a few minutes to a few hours, this indicator produced various shades of orange, yellow, green or blue with spruce and a dark blue or blue-violet with fir. With an understanding of the variables that affect the reaction, it is felt that bromophenol blue can be used for the separation of eastern spruce and balsam fir on a commercial basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351931
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Net photosynthesis, root respiration, and regrowth of Bouteloua gracilis following simulated grazing (1979)
    Springer
    Oecologia 41 (1979), S. 127-134 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Net photosynthesis (PN), root respiration (RR), and regrowth of Bouteloua gracilis (H.B.K.) Lag. were examined in the laboratory over a 10-day period following clipping to a 4-cm height to simulate grazing by large herbivores. Net photosynthesis rates of tissue remaining immediately following defoliation were only about 40% as great as preclipping rates. Three days after clipping, PN rates of defoliated plants had increased to values about 21% greater (per unit leaf area) than those of unclipped controls and remained at that level through Day 10. No statistically significant changes in RR occurred following defoliation. Biomass of unclipped plants nearly doubled during the 10-day study period, while that of defoliated plants increased 67%. Over half the new growth of defoliated plants was allocated to new leaf blades and only 18% to new roots, while only 33% of the new growth of control plants was allocated to new leaf blades but 29% went to new roots. As a consequence of increased PN rates and increased carbon allocation to synthesis of additional photosynthetic tissue following defoliation, net CO2 uptake per plant increased from 9% to 80% of that of the controls from Day 0 through Day 10.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344997
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  • 4
    Electronic Resource
    Electronic Resource
    Lactate dehydrogenase isozymes of mouse epidermis (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1034-1036 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Five isozymes of LDH are demonstrable in the epidermis of the ear pinnae, hind feet, trunk dorsa, and tails of adult C57BL, C57HR, and C3HB mice by polyacrylamide gel electrophoresis. LDH-5 activity predominates in electropherograms. The ratio of LDH-1 to LDH-5 is greater in the epidermis of ear pinna and trunk dorsum than in that of tail and hind foot. The region-specific patterns of epidermal LDH isozymes are not correlated with melanin pigmentation or ‘hairiness’ of the skin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326943
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Influence of circuit and UV prioniser parameters on the performance of a discharge pumped KrF laser (1979)
    Springer
    Applied physics 18 (1979), S. 357-361 
    Details
    ISSN: 1432-0630
    Keywords: 42.55 Hq 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 influence of the preioniser and main discharge circuit parameters on the performance of a high pressure UV preionised KrF laser using NF3 as the fluorine donor has been investigated. Output laser energy densities of 1.7J·1−1 based on the mode volume have been obtained under optimised conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899689
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  • 9
    Electronic Resource
    Electronic Resource
    Voltage-current characteristics of superatmospheric pressure CO2 laser discharges (1978)
    Springer
    Applied physics 17 (1978), S. 27-30 
    Details
    ISSN: 1432-0630
    Keywords: 52.80 ; HC 51.50+v ; 42–55 DK
    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 voltage-current characteristics of a UV preionised CO2 laser operating at pressures ≲13 atmospheres have been investigated and the quasi-steady glow and breakdown fields measured. The discharge resistivity has been found to be a function of the applied excitation field and a simple model has been developed to explain the results obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885026
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  • 10
    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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