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  • Springer  (13)
  • American Chemical Society  (4)
  • 1990-1994  (17)
  • 1993  (17)
  • 1
    Digitale Medien
    Digitale Medien
    X-ray diffraction study of fullerene soot (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 7138-7140 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100130a004
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Engineered biosynthesis of novel polyketides: manipulation and analysis of an aromatic polyketide synthase with unproven catalytic specificities (1993)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 11671-11675 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00078a002
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  • 3
    Digitale Medien
    Digitale Medien
    Impact of clouds on the surface radiation balance of the Arctic Ocean (1993)
    Springer
    Meteorology and atmospheric physics 51 (1993), S. 197-217 
    Details
    ISSN: 1436-5065
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geographie , Physik
    Notizen: Summary The relationship between clouds and the surface radiative fluxes over the Arctic Ocean are explored by conducting a series of modelling experiments using a one-dimensional thermodynamic sea ice model. The sensitivity of radiative flux to perturbations in cloud fraction and cloud optical depth are determined. These experiments illustrate the substantial effect that clouds have on the state of the sea ice and on the surface radiative fluxes. The effect of clouds on the net flux of radiation at the surface is very complex over the Arctic Ocean particularly due to the presence of the underlying sea ice. Owing to changes in surface albedo and temperature associated with changing cloud properties, there is a strong non-linearity between cloud properties and surface radiative fluxes. The model results are evaluated in three different contexts: 1) the sensitivity of the arctic surface radiation balance to uncertainties in cloud properties; 2) the impact of interannual variability in cloud characteristics on surface radiation fluxes and sea ice surface characteristics; and 3) the impact of climate change and the resulting changes in cloud properties on the surface radiation fluxes and sea ice characteristics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01030494
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of bis(tri-n-butyltin)oxide in Japanese quail exposed during egg laying period: An interlaboratory comparison study (1993)
    Springer
    Archives of environmental contamination and toxicology 24 (1993), S. 440-448 
    Details
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract The guideline no. 206 for testing of chemicals of the Organization for Economic Cooperation and Development (OECD) comprising an avian reproduction test using the Japanese quail (Coturnix coturnix japonica; Termminck and Schlegel 1849) as pair-hold test organisms has been applied in a version that reduced the treatment period to 6 weeks without any pretreatment. In the present study bis(tri-n-butyltin)oxide, C.A. No. 56-35-9 (tributyltin oxide, TBTO) was examined by five participants in an interlaboratory comparison test. A comparable regimen of dosing was performed by all participants starting either with 24 or 60 mg/kg TBTO in the feed and ending with 150 or 375 mg/kg. Within this dose range no signs of toxicity in adults were observed. Substance-related effects however were obvious with regard to egg production, fertility, hatching success, and survival of 14 day-old chicks. A clear dose dependency was given regarding effects on egg weight and on hatchability. The no-observed-effect concentrations for these two parameters was 60 mg/kg TBTO, characterizing these parameters as the most sensitive in this investigation. With the presented set of test parameters further aspects of subchronic toxicity in adults and chicks can be assessed as well as the validity of the performed test. Comparing the results for most test parameters consistency is obvious, thus confirming the applicability of the presented test guideline.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01146159
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  • 5
    Digitale Medien
    Digitale Medien
    Changes in the effects of nizatidine and famotidine on cardiac performance after pretreatment with ranitidine (1993)
    Springer
    European journal of clinical pharmacology 45 (1993), S. 151-156 
    Details
    ISSN: 1432-1041
    Schlagwort(e): H2 receptor antagonists ; Cardiac performance ; nizatidine ; famotidine ; ranitidine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary This was an open, randomized study of the cardiovascular effects of the histamine H2 receptor antagonists ranitidine, famotidine, and nizatidine after single oral doses alone or in combination in healthy volunteers. When compared with placebo ranitidine (450 mg) did not have any haemodynamic effects. Nizatidine (300 mg) caused significant falls in heart rate and cardiac output. Famotidine (40 mg) caused significant falls in stroke volume and cardiac output and an increase in pre-ejection period. Pretreatment with ranitidine abolished the haemodynamic effects of nizatidine and caused a time-shift of 2 h in the onset of the cardiovascular effects of famotidine. The difference in the results for nizatidine and famotidine can be explained by the longer half-life of famotidine. Vascular effects are assumed to be responsible for impairment of cardiac performance by famotidine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00315497
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  • 6
    Digitale Medien
    Digitale Medien
    Growth and mortality of subtidal red sea urchins (Strongylocentrotus franciscanus) at San Nicolas Island, California, USA: problems with models (1993)
    Springer
    Marine biology 117 (1993), S. 79-89 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Red sea urchins, Strongylocentrotus franciscanus, were tagged with tetracycline in 1990 at subtidal sites off San Nicolas Island, California, USA. After one year in the field, the sea urchins were collected and growth increments were measured based on tetracycline marks, which indicated initial slow growth, a maximum rate, and finally a prolonged period of very slow growth. Small red sea urchins (4 cm diam) were estimated to be 3 to 4 yr old, which is much older than has previously been reported. It is estimated that about 12 yr would be required to attain 10 cm diam. Survival has previously been modeled assuming a constant rate. If the population of red sea urchins is assumed to be stable and stationary, annual survival rate was between 71 and 77% yr-1. Census data for the two years of study have permitted annual survival to be estimated without assuming stable and stationary population structure. Under these conditions, annual survival rate was between 79 and 86% yr-1. Analysis of transitions in the size distributions from 1990 to 1991 suggested that annual survival may have been sizespecific: 91% yr-1 for individuals 1.1 to 4.0 cm diam, 82% yr-1 for individuals 4.1 to 7.0 cm diam, and 63% yr-1 for those of 7.1 to 10.0 cm diam. An alternative explanation to size-specific survival in our study is sizespecific immigration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00346428
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  • 7
    Digitale Medien
    Digitale Medien
    Changes of 6-benzylaminopurine and 2,4-dichlorophenoxyacetic acid concentrations in plant tissue culture media in the presence of activated charcoal (1993)
    Springer
    Plant cell, tissue and organ culture 33 (1993), S. 157-162 
    Details
    ISSN: 1573-5044
    Schlagwort(e): activated charcoal ; BAP adsorption ; 2,4-D adsorption ; coconut palm ; tissue culture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The rate of adsorption of 6-benzylaminopurine (BAP) and 2,4-dichlorophenoxyacetic acid (2,4-D) by activated charcoal (AC) from liquid and semi-solid tissue culture media was determined using 8-[14C]-BAP and 2-[14C]-2′,4′-D. For both liquid and semi-solid media an essentially constant ratio of free BAP: AC-bound BAP was reached between 5 and 10 days after preparation of the media. Pronounced increases in the level of available 2,4-D in the medium occurred, when either the initial BAP or 2,4-D level or both were raised to 5 × 10−4 M. When 2,4-D was used at 5 × 10−4 M the medium component sucrose (40 g l−1) caused a pronounced increase in available 2,4-D. Conversely the inclusion of the combined macro- and micronutrients markedly reduced the availability of free 2,4-D in the medium.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01983229
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  • 8
    Digitale Medien
    Digitale Medien
    A note on willingness to pay and willingness to accept (1993)
    Springer
    Social choice and welfare 10 (1993), S. 363-370 
    Details
    ISSN: 1432-217X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Abstract In a recent paper Loehman (1991) derives some relationships between measures of benefit for nonmarket goods. This note presents some remarks on Loehman's methodology, several results, if the good considered is normal, and an extension to the case of pollution, i.e. public ‘bads’.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00182511
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  • 9
    Digitale Medien
    Digitale Medien
    NMR properties of hcp Ru metal — first detection of the99Ru and101Ru NMR in a paramagnetic solid (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 1015-1018 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Results of nuclear magnetic resonance (NMR) measurements on hexagonal close-packed Rumetal are presented. The field spectra of both isotopes, having a nuclear spinI of 5/2, show a shape characteristic for quadrupolar disturbed NMR. From a simulation of these spectra, the electric field gradientV zz has been determined to be (37±0.5)×10−13 esu/cm3 in agreement with recent band structure calculations. The Knight shift tensor elements deduced from the spectra areK x =K y =0.46±0.02% andK z =0.56±0.02%. These rather high and positive shifts are completely in line with that of the neighboring elements in the periodic system and have primarily to be ascribed to the Van Vleck contribution. This part of the Knight shift is also responsible for the rather strong anisotropy, that has been found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00567457
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  • 10
    Digitale Medien
    Digitale Medien
    Experimental and theoretical investigations of the Knight shift of Pd and Ag in the alloy system Ag x Pd1−x (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 1011-1014 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The Knight shift of Pd in Ag x Pd1−x has been determined for concentrationsx≦0.2. In full accordance with the expectations based on the behaviour of the magnetic susceptibility, it was found that the Knight shift of Pd is rapidly reduced in magnitude by adding Ag to Pd. To allow for a detailed interpretation of this finding, we have performed Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) band structure calculations for Ag x Pd1−x . These calculations clearly demonstrate that the decrease in spin susceptibility with increasingx is accompanied with a decrease in core polarization. In contrast to Pd, the negative Knight shift of Ag on the Pd-rich side of the system is caused by the valence band contribution, as it is demonstrated by our calculations. This is caused by an intersite effect in analogy to the transferred hyperfine field found for non-magnetic elements dissolved in a magnetic host.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00567456
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