Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Global distribution of gaseous mercury in the troposphere (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 964-974 
    Details
    ISSN: 1420-9136
    Keywords: Atmospheric chemistry ; Interhemispheric differences ; Mercury
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Atmospheric mercury concentrations were measured during a nautical expedition on the Atlantic Ocean between Hamburg (54°N, 10°E) and Santo Domingo (20°N, 67°W). In addition, samples were taken during flights on a commerical aircraft in the upper and middle troposphere between 60°N and 55°S, mostly over the Pacific Ocean. The data obtained in the lower troposphere over the Northern Atlantic show considerable variation in the Hg concentrations, with values ranging between 1 and 11 ng/m3; the average concentration was found to be 2.8 ng/m3. The upper tropospheric data show an interhemispheric difference with average values of 1.45 ng/m3 and 1.08 ng/m3 in the Northern and Southern Hemisphere, respectively. This suggests that mercury production occurs predominantly over the continents both by natural and anthropogenic processes. The mercury content in aerosols was found to be ≤0.3 ng/m3, or one-tenth of the atmospheric concentration. The data indicate a mean residence time of mercury in the atmosphere of a few months to one year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01593043
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    OH radical concentration in the stratosphere (1973)
    Springer
    Pure and applied geophysics 106-108 (1973), S. 1417-1430 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The consumption of both methane and carbon monoxide in the lower stratosphere is due predominantly to reaction with OH radicals. The possibility of deriving OH concentration from measurements of the decrease of CH4 and CO mixing ratios above the tropopause is explored. The observations and the basic chemistry are briefly summarized. Simple one-dimensional diffusion models are employed to derive expressions for the decrease of CH4 and CO mixing ratios with altitude above the tropopause, and the influence of important parameters is discussed. Vertical air velocities resulting from large-scale organized mean motion and from synoptic variations are shown to distort the concentration altitude profiles of methane and carbon monoxide, respectively. Suitable averaging of observational data is required to eliminate the effects due to vertical motion. Then a reliable value for the effective OH number density should be obtainable. At present an estimate of 4×106 molecules/cm3 is derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00881094
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Vertical distribution of chlorofluoromethanes in the upper troposphere and lower stratosphere (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 554-566 
    Details
    ISSN: 1420-9136
    Keywords: Chlorofluoromethanes ; Gradients ; Tropopause region
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Vertical profiles of CCl4, CFCl3, and CF2Cl2 mixing ratios in the upper troposphere and lower stratosphere have been measured on four flights with chartered aircraft, type HS 125. The flights were carried out in November and December 1976 over Europe at latitudes between 50 and 60°N. At least eight air samples were taken during each ascent and descent of the aircraft at altitudes between 7 and 12.5 km. The samples were analysed in the laboratory using gaschromatographic procedures. The results indicate a decrease of the CCl4, CFCl3, and CF2Cl2 mixing ratios above the tropopause. The observed average gradients in the stratosphere are 14 pptv/km for CCl4, 12 pptv/km for CFCl3 and 27.8 pptv/km for CF2Cl2. With exception of CFCl3 these gradients are higher than those predicted by model calculations. Apparently, further sink mechanisms for CCl4 and CF2Cl2 exist in the lower stratosphere not yet included in the models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01636908
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The influence of plants on atmospheric carbon monoxide and dinitrogen oxide (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 439-451 
    Details
    ISSN: 1420-9136
    Keywords: Carbon monoxide ; Nitrous oxide ; Plants ; Radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract It is shown by laboratory experiments and extensivein-situ measurements that higher plants (Vicia faba, Platanus acerifolia, Fagus silvatica, andPinus silvestris) produce carbon monoxide. The measurements were carried out under natural conditions with respect to the concentrations of O2 and H2O, and temperature. The CO2- and CO-mixing ratios were varied in the ranges 350 to 530 ppm and 3–270 ppb, respectively. The CO-production rates were found to be light dependent with an average value per cm2 of leaf area of 3×10−13 g/sec for a radiation intensity of 5×104 erg/cm2 sec. The production rates are independent of the CO2- and CO-mixing ratios employed in the test atmosphere. Considering the production rate of 3×10−13 g/cm2 sec to be representative for global conditions the total CO-production by plants is estimated to be 0.5–1.0×1014 g/year. In contrast to carbon monoxide atmospheric dinitrogen oxide is not influenced by plants in the same manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01636898
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The fine structure of lamellated receptors in the skin of Rana Esculenta (1974)
    Springer
    Anatomy and embryology 144 (1974), S. 165-172 
    Details
    ISSN: 1432-0568
    Keywords: Frog ; Skin ; Lamellated encapsulated receptors ; Mechanoreceptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Lamellierte, eingekapselte Nervenendigungen, die bis zu 0,4 mm lang werden, liegen im Bindegewebe der Haut des Frosches im äußeren Drittel der zona compacta. Eine dichtere Verteilung kleinerer lamellierter eingekapselter Rezeptoren findet sich an den Volarseiten der Finger. Die Rezeptoren besitzen einen schmalen Kapselraum. In Rekonstruktionen konnte nachgewiesen werden, daß bis zu sechs lamellierte eingekapselte Körperchen an einem Hauptaxon liegen. Das Hauptaxon mit einem Durchmesser von 8–12 μ gehört immer zu den größten Axonen in den cutanen Nervenfaserbündeln. Wir vermuten, daß die lamellierten eingekapselten Körperchen schnell adaptierende Mechanoreceptoren sind.
    Notes: Summary Lamellated encapsulated nerve terminals up to 0.4 mm in length are located in the skin in the outer part of the zona compacta. In the palmar side of the fingers the receptors are abundant and relatively small in size. In larger corpuscles a capsular space is evident. One main axon posesses up to six lamellated encapsulated corpuscles, as shown by reconstructions of serial sections. These axons (diameter 8–12 μ) belong to the largest fibers in cutaneous nerves. We assume these lamellated encapsulated corpuscles to be rapidly adapting mechanoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00519772
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Desmopressin reduces night urine volume in geriatric patients implication for treatment of the nocturnal incontinence (1992)
    Springer
    Journal of molecular medicine 70 (1992), S. 619-619 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00184808
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Spatial and seasonal distribution of organic amendments affecting methane emission from Chinese rice fields (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 191-195 
    Details
    ISSN: 1432-0789
    Keywords: Methane emission ; Wetland rice ; Fertilization ; Mitigation of greenhouse gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of fertilizers on methane emission rates was investigated using an automated closed chamber system in Chinese rice fields (Human Province). Each of three experiments compared two fields treated with a first uniform fertilizer dose and a second fertilizer dose which was different for each of the two fields. The uniform fertilizer doses for both fields in each experiment comprised mineral (experiment 1), organic (experiment 2) and combined mineral plus organic components (experiment 3). In all three experiments the second fertilizer dose comprised organic amendments for field 1 and no organic amendments for field 2. The rate of increase in methane emission with a given amount of organic manure was found to depend on the total amount of organic manure applied. A single dose of organic manure increased the emission rates by factors of 2.7 to 4.1 as compared to fields without organic manure (experiment 1). In rice fields that had already been treated with organic manure, the application of a second dose of organic manure only slightly enhanced the emission rates in experiment 2 by factors of 1.1 to 1.5 and showed no detectable increase in experiment 3. The net reduction achieved by separation of organic and mineral fertilizers was maximized by concentrating the organic amendments in the season with low emission rates, i.e. early rice, and using exclusively mineral fertilizers on late rice when emission rates were generally higher. This distribution pattern, which was not associated with significant yield losses, resulted in an annual methane emission corresponding to only 56% of the methane emitted from fields treated with blended fertilizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00382511
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Die Bildung von Spuren von Kohlenmonoxid durch Saccharomyces cerevisiae und andere Mikroorganismen (1974)
    Springer
    Archives of microbiology 100 (1974), S. 243-252 
    Details
    ISSN: 1432-072X
    Keywords: Saccharomyces cerevisiae ; Carbon Monoxide Trace-Measurement ; 14C-Glucose ; CO Production ; Atmospheric Cycle of Trace Gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Mit einer empfindlichen Analysenmethode, die auf die Reaktion CO+HgO→CO2+Hg basiert und den CO-Gehalt auf Grund der Absorption des freigesetzten Hg bei 2537 Å ermittelt, wurden im Gasraum über wachsenden Kulturen von Saccharomyces cerevisiae, S. oviformis, Escherichia coli, Aerobacter aerogenes, Pseudomonas spec. und Lactobacillus brevis 0.4–2.6 ppm CO nachgewiesen. Bei Lactobacillus arabinosus, Bacillus cereus var. mycoides und Aspergillus niger war eine CO-Bildung nicht meßbar. 2. Bei S. cerevisiae war die CO-Bildung bei Konzentrationen von 10–50 g Glucose pro Liter Medium am größten. Außerdem wurde die CO-Bildung proportional zum anfänglichen Sauerstoffgehalt im Gasraum über den Kulturen gefördert. 3. Mit 14C-markierter Glucose wurde nachgewiesen, daß CO aus Glucose entsteht. 4. Die CO-Bildung der untersuchten Mikroorganismen ist so gering, daß sie keine Bedeutung für den Kreislauf dieses Spurengases in der Atmosphäre hat.
    Notes: Summary 1. Growing cultures of Saccharomyces cerevisiae, S. oviformis, Escherichia coli, Aerobacter aerogenes, Pseudomonas spec. and Lactobacillus brevis produce trace amounts of CO (0.4–2.6 ppm) that can be detected in the gas space above the cultures using a sensitive analytical method based on the reaction CO+HgO→CO2+Hg. The liberated Hg is quantitatively measured by atomic absorption at 2537 Å. No CO could be detected above cultures of Lactobacillus arabinosus, Bacillus cereus var. mycoides and Aspergillus niger. 2. The maximum CO production by Saccharomyces was obtained with concentrations of 10–50 g glucose per liter medium. The amount of CO formed increased with the oxygen concentration in the gas space above the cultures. 3. Using 14C-glucose it was shown that S. cerevisiae forms CO from glucose. 4. The formation of CO by the microorganisms investigated is very small. The ratio of CO/CO2 produced is much smaller than in environmental air. Therefore it can be concluded that the production of CO by these microorganisms has probably no significance for the atmospheric cycle of this trace gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446321
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Determination of benperidol and its reduced metabolite in human plasma by high-performance liquid chromatography and electrochemical detection
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 565 (1991), S. 363-373 
    Details
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4347(91)80397-U
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The determination of total gaseous mercury in air at background levels
    Amsterdam : Elsevier
    Analytica Chimica Acta 110 (1979), S. 35-47 
    Details
    ISSN: 0003-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0003-2670(01)83526-1
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...