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  • 1
    Electronic Resource
    Electronic Resource
    Biomolecules in the gas phase. 1. Multiphoton-ionization mass spectrometry of native chlorophylls (1986)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 108 (1986), S. 4233-4234 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00274a069
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  • 2
    Electronic Resource
    Electronic Resource
    Potential rates of nitrification and denitrification in an oligotrophic freshwater sediment system (1987)
    Springer
    Microbial ecology 14 (1987), S. 91-100 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Potential rates of nitrification and denitrification were measured in an oligotrophic sediment system. Nitrification potential was estimated using the CO oxidation technique, and potential denitrification was measured by the acetylene blockage technique. The sediments demonstrated both nitrifying and denitrifying activity. Eh, O2, and organic C profiles showed two distinct types of sediment. One type was low in organic C, had high O2 and Eh, and had rates of denitrification 1,000 times lower than the other which had high organic C, low O2, and low Eh. Potential nitrification and denitrification rates were negatively correlated with Eh. This suggests that environmental heterogeneity in denitrifier and nitrifier populations in oligotrophic sediment systems may be assessed using Eh before sampling protocols for nitrification or denitrification rates are established. There was no correlation between denitrification and nitrification rates or between either of these processes and NH4 + or NO3 − concentrations. The maximum rate of denitrification was 0.969 nmole N cm−3 hour−1, and the maximum rate of nitrification was 23.6 nmole cm−3 hour−1, suggesting nitrification does not limit denitrification in these oligotrophic sediments. Some sediment cores had mean concentrations of 6.0 mg O2/liter and still showed both nitrification and denitrification activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02011574
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular ion spectroscopy: Mass selected, resonant two-photon dissociation spectra of CH3I+ and CD3I+ (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1914-1922 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a new ion spectroscopic technique by which it is possible to investigate larger molecular ions by scanning an entire electronic state and coincidentally measuring and, hence, fixing the mass of the fragment ion observed. The technique involves primary resonance excitation together with secondary absorption followed by dissociation as detection process, employing the absorption of two photons in the ion. This method accesses the nondissociating vibronic levels of an electronic state rather than just the narrow range of predissociating levels, as in one-photon dissociation spectroscopy. Spectra of CH3I+ and CD3I+ over a range of 7000 cm−1, beginning at the origin of the A˜ state, were recorded with progression bands up to n=21. These spectra allow for the first time an unambiguous assignment of the A˜←X˜ transition of CH3I+ and CD3I+. The exact positions of the electronic origin as well as of the origin of several progressions and new values for several vibrational constants of methyl iodide cations are reported. Some 300 bands in both ions were measured and assigned with this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455088
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  • 4
    Electronic Resource
    Electronic Resource
    An inexpensive device for sampling large volumes of lake water from discrete depths (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 20 (1988), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. A sampler was developed that displaces surface water which is replaced with water from a sampling tube at a set depth.2. The displacement sampler is inexpensive, easy to build, and is capable of collecting water at 7.5 I min−1.3. Phytoplankton photosynthesis was higher in water from the displacement sampler than in water collected with a Van-Dorn bottle. Subsequent experiments indicated this was due to inhibition caused by the Van-Dorn bottle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1988.tb01722.x
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  • 5
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    Unknown
    Sex on the Brocken: Symbol and Image in Faust's 'Walpurgisnachtstraum' (1987)
    Bern : Periodicals Archive Online (PAO)
    Colloquia germanica. 20 (1987) 119 
    Details
    ISSN: 0010-1338
    Topics: German, Dutch and Scandinavian Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:e332-1987-020-00-000028
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  • 6
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    Unknown
    Goethe Yearbook. Publications of the Goethe Society of North America. Ed. THOMAS P. SAINE. Vol. 3 (Book Review) (1987)
    Bern : Periodicals Archive Online (PAO)
    Colloquia germanica. 20 (1987) 245 
    Details
    ISSN: 0010-1338
    Topics: German, Dutch and Scandinavian Studies
    Notes: Besprechungen/Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:e332-1987-020-00-000047
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  • 7
    Electronic Resource
    Electronic Resource
    Understanding Romanowsky staining (1987)
    Springer
    Histochemistry and cell biology 86 (1987), S. 331-336 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Normal blood smears were stained by the standardised azure B-eosin Y Romanowsky procedure recently introduced by the ICSH, and the classical picture resulted. The effects of varying the times and temperature of staining, the composition of the solvent (buffer concentration, methanol content, & pH), the concentration of the dyes, and the mode of fixation were studied. The results are best understood in terms of the following staining mechanism. Initial colouration involves simple acid and basic dyeing. Eosin yields red erythrocytes and eosinophil granules. Azure B very rapidly gives rise to blue stained chromatin, neutrophil specific granules, platelets and ribosome-rich cytoplasms; also to violet basophil granules. Subsequently the azure B in certain structures combines with eosin to give purple azure B-eosin complexes, leaving other structures with their initial colours. The selectivity of complex formation is controlled by rate of entry of eosin into azure B stained structures. Only faster staining structures (i.e. chromatin, neutrophil specific granules, and platelets) permit formation of the purple complex in the standard method. This staining mechanism illuminates scientific problems (e.g. the nature of ‘toxic’ granules) and assists technical trouble-shooting (e.g. why nuclei sometimes stain blue, not purple).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490267
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  • 8
    Electronic Resource
    Electronic Resource
    277. Der peritoneo-venöse Shunt — Eine Möglichkeit zur chirurgischen Therapie des therapieresistenten Ascites (1985)
    Springer
    Langenbeck's archives of surgery 366 (1985), S. 694-694 
    Details
    ISSN: 1435-2451
    Keywords: Peritoneovenous shunts ; Implantation technique ; Long-term results ; Peritoneo-venöser Shunt ; Implantationstechnik ; Langzeitergebnis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der peritoneo-venöse Shunt (PVS) hat sich in den letzten Jahren in der Therapie des therapieresistenten Ascites bewährt. Im Film werden Indikationsstellung, aktuelle Shuntsysteme, Implantationstechnik, Komplikationen, postop. Verlauf and Langzeitergebnisse dargestellt. Von 1976–1985 wurden bei 61 Patienten insgesamt 69 Shuntsysteme implantiert. Häufigste Ursache war die Lebercirrhose. Durchschnittliche Funktionsdauer betragt 21,7 Monate, längste Implantationsdauer 7 Jahre. Die Komplikationsrate ist erheblich: 19 Patienten verstarben wahrend des stationären Aufenthaltes. Gefürchteste Komplikationen sind die Shuntinfektion and Gerinnungsstörung. Trotz der hohen Komplikationsrate ist die Anlage eines PVS zu empfehlen.
    Notes: Summary Implantation of a peritoneovenous shunt has proven effective in the treatment of therapyresistant ascites. The film shows indication, present shunt systems, implantation technique, complications, postoperative course, and long-term results. From 1976 to 1985, a total of 68 shunt systems were implanted in 61 patients. The most common cause was hepatic cirrhosis. The average functional period is 21.7 months and the longest implantation time nearly 7 years. The complication rate is considerable: 19 patients died during hospitalization. The most dreaded complications are shunt infection and coagulation disturbances. In spite of the high complication rate, our experience shows that the peritoneovenous shunt can be recommended for combatting therapy-resistant ascites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01836875
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  • 9
    Electronic Resource
    Electronic Resource
    The biological effects of nitrate fertilization and water replacement in an oligotrophic cold water pond (1988)
    Springer
    Hydrobiologia 162 (1988), S. 141-146 
    Details
    ISSN: 1573-5117
    Keywords: nitrate ; fertilization ; pond ; oligotrophic ; N-limited ; Nostoc ; limnocorral
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plastic enclosures (limnocorrals) were used to assess the impact of adding NO3 - to an oligotrophic pond. The pond, Mare's Egg Spring, is spring fed at a constant temperature of 4.5 °C (the main portion of the pool never exceeded 6 °C) and a molar ratio of N:P of 0.5. The pool is dominated by the cyanobacterium (blue green alga), Nostoc pruniforme, which is capable of nitrogen fixation. This, in combination with the low N:P ratio, suggested that non-nitrogen fixing primary producers were limited by nitrogen. Over a period of one month, growth and nitrogen fixation of Nostoc, suspended chlorophyll, sediment denitrification, and benthic diatom diversity were not dependent upon nitrate concentration. However, sedimentary chlorophyll levels increased slightly when NO inf3 sup- levels were increased from 0.71 µM (ambient) to 214 µM. Limnocorrals with slit sides gave water replacement rates between those for complete enclosure and those in open water. In the open channel, Nostoc growth was highest, and suspended chlorophyll the lowest. In the closed corrals, Nostoc growth was the lowest and suspended chlorophyll the highest, with intermediate values in the slit corrals. Therefore, short term increases of NO inf3 sup- levels in nitrogen poor aquatic systems do not necessarily affect the biological community, but slowing water replacement in small ponds may have significant effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014536
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  • 10
    Electronic Resource
    Electronic Resource
    Photometric data and analysis of the light curve of the W UMa-variable ST Ind (1989)
    Springer
    Astrophysics and space science 161 (1989), S. 1-10 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoelectric observations of the W UMa variable ST Ind are analyzed which were obtained at the European Southern Observatory in the course of a program to monitor light curve fluctuations. Photometric and geometric elements of ST Ind are derived. The observations show the presence of a periodic fluctuation in certain parts of the light curve which may be explained by the precessional motion of the rotation axis of the brighter component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653232
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