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  • Electronic Resource  (11)
  • 1990-1994  (10)
  • 1930-1934  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Inhibition of herpes simplex virus type 1 ribonucleotide reductase by substituted tetrapeptide derivatives (1993)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 36 (1993), S. 3005-3009 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00072a021
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  • 2
    Electronic Resource
    Electronic Resource
    Gelation of Frozen Egg Magma (1933)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 25 (1933), S. 669-674 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50282a022
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  • 3
    Electronic Resource
    Electronic Resource
    HPLC Quantitation of Alginate or Pectin Added to Lean Ground Pork (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method was developed to isolate and quantify uranic acid(s) of alginate or pectin added at various concentrations to lean (5–7% crude fat) ground pork. The method used an Aminex HPX-87-H+ column, isocratic 0.009N H2SO4 eluent and ultraviolet detection. For regression equations derived from mean uranic acid concentrations to predict percentage of alginate or pectin, R2 values were 0.99 for total uranic acids (alginate) and 0.97 for galacturonic acid (pectin). Reproducibility was 84% for alginate and 94% for pectin contents. Recoveries were: alginate 85% and pectin 80%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb06091.x
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  • 4
    Electronic Resource
    Electronic Resource
    Origin of short period comets (1992)
    Springer
    Celestial mechanics and dynamical astronomy 54 (1992), S. 49-61 
    Details
    ISSN: 1572-9478
    Keywords: Short-period comets ; dynamics ; Oort cloud ; giant comets ; terrestrial catastrophism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Reasons for interest in the origin of short-period comets and the difficulties of computing their long-term dynamcal evolution are reviewed. The relative advantages of a source region in an extended ‘inner core’ of the Oort cloud or a compact ‘comet belt’ just beyond the planetary system are finely balanced, and it is premature to consider the problem solved. A complication is that some comets belonging to the Jupiter family may be part of a time-dependent system, possibly the remains of a giant comet such as Chiron which could have been part of the system ≈ 104 yr ago. The origin of short-period comets plays a pivotal role in many areas of solar system science: planet formation, the source of water (possibly life) on the terrestrial planets, the cratering record on the terrestrial planets and satellites of the outer planets, and the environmental impact posed by massive bodies and their decay products in the Earth's near-space environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00049543
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  • 5
    Electronic Resource
    Electronic Resource
    Rapid dynamical evolution of giant comet Chiron (1990)
    [s.l.] : Nature Publishing Group
    Nature 348 (1990), S. 132-136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Numerical simulation of orbits like that of the giant comet Chiron show a distinct asymmetry between past and future. Simulations extending ±100,000 years from the present suggest that on this time-scale, Chiron is about twice as likely to have been a short-period comet at some time in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/348132a0
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  • 6
    Electronic Resource
    Electronic Resource
    Quantitative and qualitative seasonal changes in the microbial community from the phyllosphere of sugar beet (Beta vulgaris) (1993)
    Springer
    Plant and soil 150 (1993), S. 177-191 
    Details
    ISSN: 1573-5036
    Keywords: Beta vulgaris ; bacteria ; community composition ; filamentous fungi ; microbial numbers ; phyllosphere ; yeasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Bacteria, yeasts and filamentous fungi colonizing immature, mature and senescing primary leaves of field grown Beta vulgaris (sugar beet) were analysed over a complete growing season. Greatest microbial numbers were detected on senescing primary leaves and these numbers increased over most of the season. The number of colonizers detected on mature leaves was found to be stable over most of the study. Filamentous fungi and yeasts were identified to the genus level and the communities found to have greatest diversity during the summer months. There was no consistent pattern of diversity according to leaf type. Two genera of filamentous fungi, Cladosporium and Alternaria and two yeast genera, Cryptococcus and Sporobolomyces were the most numerous fungal populations isolated. Only 8 filamentous fungi and 3 yeast genera were commonly isolated on PDA (potato dextrose agar). Bacterial strains (1236) were isolated on Tryptic Soy Broth (TSB) agar and identified to species, or in some cases sub-species level, by analysis of their fatty acid methyl ester (FAME) profiles. Isolated bacteria were grouped into 78 named and 37 unnamed species clusters. Greatest number of bacterial species were isolated from young plants and leaves, sampled during the autumn months. Bacterial community diversity was lowest in mid-summer and winter months. Pseudomonas was the most commonly isolated genus and Erwinia herbicola the most common species. P. aureofaciens was the only species isolated from soil that was also isolated from the phyllosphere of B. vulgaris throughout the season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013015
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  • 7
    Electronic Resource
    Electronic Resource
    Quantitative determination of wood-derived soluble oligosaccharides by HPLC (1993)
    Springer
    Biotechnology techniques 7 (1993), S. 785-790 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Soluble oligosaccharide carbohydrates from the partial enzymatic hydrolysis of pulp were degraded to monosaccharides by enzymatic hydrolysis using a complete mixture of cellulolytic and hemicellulolytic enzymes and subsequently analysed by HPLC. With this method it was possible to obtain a quantitative estimate of both the 5- and 6-carbon sugars comprising the soluble oligosaccharides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153745
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  • 8
    Electronic Resource
    Electronic Resource
    Production of xylanases byAspergillus fumigatus andAspergillus oryzae on xylan-based media (1993)
    Springer
    World journal of microbiology and biotechnology 9 (1993), S. 80-84 
    Details
    ISSN: 1573-0972
    Keywords: Aspergillus fumigatus ; Aspergillus oryzae ; xylanase production ; xylan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Aspergillus fumigatus andA. oryzae were cultivated in laboratory fermenters on media containing xylan as the main carbon source.A. fumigatus produced xylanase on unsubstituted, insoluble beech xylan but growth and enzyme production on soluble xylo-oligosaccharides from the steaming of hardwood were poor due to the presence of inhibitors. An essential prerequisite for good xylanase production byA. fumigatus was decrease in the pH of the cultivation below 3.0 At higher pH values, the production of proteolytic enzymes caused degradation of the xylanase activity already produced.A. oryzae produced rather less xylanase activity thanA. fumigatus on the beech xylan medium but, after adaptation, was capable of efficient enzyme production on the steamed substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656523
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  • 9
    Electronic Resource
    Electronic Resource
    Absolute state selective cross sections for ionization-excitation and excitation of helium in e− + He, H+ + He, H 2 + + He and H 3 + + He collisions (1991)
    Springer
    The European physical journal 21 (1991), S. S309 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured absolute EUV emission cross sections for ionization-excitation of helium by H+, H 2 + and H 3 + (v: 1.4 to 8 a.u.) and e− (v: 3.5 to 8 a.u.) and the absolute emission yields for excitation of He. An interesting comparison is made based on three different mass and structural states for H+, H 2 + and H 3 + . Also examined is the comparison of H+ and e− projectiles which involves a large mass difference and opposite charge state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426336
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  • 10
    Electronic Resource
    Electronic Resource
    Investigation of the ionization processes occurring in liquid-assisted secondary ion mass spectrometry of derivatized monosaccharides (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 1329-1339 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several derivatized monosaccharides, the 2-deoxy-D-ribofuranoses, have been studied by liquid-assisted secondary ion mass spectrometry (LSIMS) in order to gain insight into the factors affecting ionization in FAB/LSIMS. Examination of the mass spectra for these compounds obtained in eight liquid matrices (diethanolamine, ethylene glycol, glycerol, 2-hydroxyethyl disulfide, 2-hydroxyphenethyl alcohol, 3-nitrobenzyl alcohol, sulfolane and thioglycerol) reveals that in all cases the anomalous [M - H]+ ion is the predominant species in the molecular ion region and that [M + Na]+ species are observed in the presence of Na+. The analysis of these compounds by chemical ionization with ammonia shows [M + H]+ as the major species while [M - H]+ is essentially absent. This indicates that the ionization processes occurring in the two techniques are not analogous. Thermodynamic considerations based on the gas-phase hydride ion affinities of the protonated matrices do not support a predominant gas-phase mechanism for the formation of [M - H]+ in LSIMS. However, it is possible using solvation energies to rationalize the formation of [M - H]+ in terms of condensed-phase ionization processes which take place either in the liquid matrix or in the dense selvedge region immediately above the surface where extensive solvation is present. Electrospray data obtained for one of the derivatized monosaccharides indicates that the [M - H]+ is not performed in the condensed phase in LSIMS and that it is the product of fast ion beam-induced processes. While the nature of the matrix is seen to have little effect on the intensities of [M - H]+ and [M + H]+ it is observed to be an important factor for the intensity of M+· for one of the monosaccharides. This effect can be related to the electron-scavenging properties of the matrices and reinforces the hypothesis that condensed phase processes are significant in ionization.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210281108
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