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  • Springer  (72)
  • American Institute of Physics  (29)
  • Oxford University Press  (10)
  • 2005-2009
  • 1995-1999
  • 1990-1994
  • 1980-1984  (111)
  • 1982  (111)
Collection
Keywords
Publisher
Years
  • 2005-2009
  • 1995-1999
  • 1990-1994
  • 1980-1984  (111)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Deuterium isotope effects in the ninhydrin reaction of primary amines (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 299-300 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The rate of development of Ruhemann's purple in the ninhydrin reaction of two deuterated primary amines, αα-d2-p-tyramine and αα-d2-β-phenylethylamine, is significantly reduced It appears to be a primary isotope effect and indicates that the cleavage of the carbon-hydrogen bond at the α-position is involved in the rate-determining step of the color reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01949352
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  • 2
    Electronic Resource
    Electronic Resource
    Diel relationships of microbial trophic groups and in situ dissolved carbohydrate dynamics in the caribbean sea (1982)
    Springer
    Marine biology 67 (1982), S. 311-322 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dissolved total carbohydrate (TCHO), polysaccharide (PCHO), monosaccharide (MCHO) and organic carbon (DOC) were determined at 3-h intervals over 5 diel cycles in the mixed layer of the northwestern Caribbean Sea while following a drogued buoy. These data have been compared to populations of phototrophic (PNAN) and heterotrophic (HNAN) nanoplankton (2–20 μm diameter) and heterotrophic bacteria (HBAC) (0.2–2.0 μm diameter) estimated by epifluorescence counts, as well as to ΣCO2, phosphate, chlorophyll a and phaeopigment data determined simultaneously. Two different types of apparent diel dissolved carbohydrate (CHO) patterns were found. On 3 d when no sustained net ΣCO2 uptake was evident, TCHO and PCHO generally declined during the afternoon and early evening while MCHO tended to increase. On two other days when apparent sustained ΣCO2 uptake occurred during the day, there were large evening TCHO and PCHO peaks with constant or declining MCHO levels. These accumulations probably resulted from the release of recently produced PCHO from phototrophs. As was found earlier in the Sargasso Sea, PNAN populations were inversely related to PCHO concentrations. The sample to sample fluctuations of PNAN also were inversely related to the apparent rates of change of TCHO and PCHO, possibly due to an inverse relation between the rates of PNAN cell division and CHO excretion. Fluctuations in HBAC populations were inversely correlated with PCHO dynamics and directly related to MCHO variations, possibly due to extracellular hydrolysis of PCHO to MCHO during periods of rapid bacterial growth as well as to net heterotrophic PCHO uptake. A direct relationship between HNAN and TCHO fluctuations suggests the importance of HNAN excretion in the release of dissolved organics. The combined PNAN and HBAC fluctuations accounted for a more significant fraction of the variance in the apparent rates of change of PCHO than did any single population parameter indicating that intimate interactions between the microbial plankton groups are important in the in-situ regulation of CHO dynamics. Total system net TCHO release and uptake rates for 5 d averaged 56 and 53 μg C l-1 d-1 respectively, assuming that the observed fluctuations resulted from temporal planktonic processes in homogeneous water masses. While the data contain indications that this was the case, this assumption is not definitive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397672
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  • 3
    Electronic Resource
    Electronic Resource
    Man-made structures on marine sediments: Effects on adjacent benthic communities (1982)
    Springer
    Marine biology 70 (1982), S. 295-303 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study (1975–1977) examines the effect of man-made structures on natural sand bottom communities in shallow water in San Diego County, southern California, USA. While there were shallow scour effects to 15 m around some artificial reefs, the reefs had no measurable effect on sand ripple patterns, grain size, organic carbon or infauna beyond the scoured areas. Foraging by reef-associated fishes produced profound alterations in the epifauna populations of the sea pen Stylatula elongata. The sea pen densities were 4 to 10 m-2 before the reefs were established, but within 5 mo were eliminated from distances greater than 200 m around the reefs. On the other hand, densities of the tube-building polychaetes Diopatra spp. seemed to be enhanced in the immediate vicinity of the artificial reef. Oil platforms and bridge pilings seem to have much more profound effects on the nearby sand communities than do the relatively small artificial reefs. In addition to the elimination of sea pens, Diopatra spp. densities increased from 〈1.0 m-2 in control areas to as many as 73 m-2 in the vicinity of oil platforms. Grain size and infauna were strongly affected by the oil platform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396848
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  • 4
    Electronic Resource
    Electronic Resource
    No. 2 fuel oil compounds in Mytilus edulis (1982)
    Springer
    Marine biology 66 (1982), S. 15-26 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mytilus edulis contaminated by a brief 2-d exposure to a slick from a No. 2 fuel oil spill in the Cape Cod Canal, Massachusetts, USA were sampled six times during an 86-d post-spill period to study the rate of release of fuel oil compounds under field conditions. Detailed measurements of compounds by high resolution glass capillary gas chromatography and quantitative glass capillary gas chromatography-mass spectrometry-computer systems analyses provided a more comprehensive examination of release rates of different types of compounds. Biological half-lives were calculated for selected compounds for the first 21 d during which the release rates were exponential. Typical half-lives were n-alkanes, 0.2–0.8 d; pristane, 1.5 d; C-2 (dimethyl or ethyl) napthalenes, 0.9 d; methyl phenanthrenes, 1.7 d. Changes in relative ratios of C-2 phenanthrenes during the release period were observed. The evidence available to date strongly supports the role of molecular weight and accompanying properties of water solubility as the main controlling factors in the rate of release of fuel oil compounds by M. edulis. However, the data for the rapid release of n-alkanes and C-2 phenanthrenes also indicate molecular type and molecular configuration as additional key factors. The data from this study are compared and contrasted to data from short term experimental studies in the laboratory, longer term studies from chronic exposure conditions, and data from two other oil spills with longer term exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397250
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  • 5
    Electronic Resource
    Electronic Resource
    Dispersion in a cw optically pumped FIR laser (1982)
    Springer
    Applied physics 29 (1982), S. 131-134 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 Hg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Direct frequency measurements of a13CO2/15NH3 OPFIRL output show that laser pulling effects give shifts of a few MHz, which agree well with a density matrix calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692775
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  • 6
    Electronic Resource
    Electronic Resource
    Potential exposure of apple thinners to phosalone (1982)
    Springer
    Bulletin of environmental contamination and toxicology 29 (1982), S. 592-598 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01669626
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  • 7
    Electronic Resource
    Electronic Resource
    Reaction of pyridoxal 5′-phosphate with TRIS (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 999-1004 
    Details
    ISSN: 1434-4475
    Keywords: Coenzymes ; Pyridoxal 5′-phosphate ; Tris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es werden Untersuchungen über die Kinetik und das Gleichgewicht der Reaktion von Pyridoxal-5′-phosphat mitTRIS vorgelegt. Wenn derpH bei 25°C von 7,3 auf 9,3 erhöht wird, steigt die Geschwindigkeitskonstante zweiter Ordnung von 1,05 M−1 s−1 auf 3,79 M−1 s−1, während die scheinbare Dissoziationskonstante sich im Bereich von 2 bis 8 mM verändert. Die Ergebnisse zeigen, welche Bedeutung diese Reaktion für Untersuchungen von Pyridoxal-5′-phosphat-abhängigen Enzymen bei Verwendung vonTRIS-Puffer hat.
    Notes: Abstract Kinetic and equilibrium studies are presented on the reaction of pyridoxal 5′-phosphate withTris. Upon raising thepH from 7.3 to 9.3 at 25°C, the second-order rate constant increases from 1.05 M−1 s−1 to 3.79 M−1 s−1, whereas the apparent dissociation constant varies from 2 to 8 mM. These results demonstrate the significance of this reaction whenTris buffer is used in studies of pyridoxal 5′-phosphate-dependent enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799241
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  • 8
    Electronic Resource
    Electronic Resource
    The growth of filaments by the condensation of coronal arches (1982)
    Springer
    Solar physics 81 (1982), S. 325-338 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A model of filament formation based on the condensation of coronal arches is described. The condensation results from initiating the radiative instability within an arch by superimposing a transient energy supply upon the steady state heating mechanism. The transient energy supply increases the density within the arch so that when it is removed the radiative losses are sufficient to lead to cooling below the minimum in the power loss curve. Times from the initial formation of the condensation to its temperature stabilization as a cool filament have been calculated for various initial conditions. They lie in the range 104 to 105 s with the majority of the time spent above a temperature of 1 × 106 K. Under the assumption that the condensation of a single arch forms an element of the filament, a complete filament requires the condensation of an arcade of loops. Using experimentally derived parameters, filament densities of 1011 to 1012 cm−3 can be obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151305
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  • 9
    Electronic Resource
    Electronic Resource
    Properties of coronal arches (1982)
    Springer
    Solar physics 80 (1982), S. 295-307 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The properties of coronal arches located on the peripheries of active regions, observed during a sounding rocket flight on March 8, 1973, are discussed. The arches are found to overlie filament channels and their footpoints are traced to locations on the perimeters of supergranulation cells. The arches have a wide range of lengths although their widths are well approximated by the value 2.2 × 109 cm. Comparison of the size of the chromospheric footprint with the arch width indicates that arches do not always expand as they ascend into the corona. The electron temperatures and densities of the plasma contained in the arches were measured and the pressure calculated; typical values are 2 × 106 K, 1 × 109 cm−3, and 2 × 10−1 dyne cm−2, respectively. The variation of these parameters with position along the length of the arch indicates that the arches are not in hydrostatic equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00147975
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  • 10
    Electronic Resource
    Electronic Resource
    Relaxation oscillations in cw optically pumped CD3OD and15NH3 lasers (1982)
    Springer
    Applied physics 27 (1982), S. 187-190 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Hg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the results of heterodyne measurements of the mode quality and tuning range of a cw CO2 laser designed for optically pumping a far-infrared (FIR) molecular laser, and describe the implications of multi-mode operation. In particular we report the observation of relaxation oscillations in the output of a FIR waveguide laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697439
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