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  • 1
    Electronic Resource
    Electronic Resource
    The influence of different fertilization practices on concentrations of organic carbon and total nitrogen in particle-size fractions during 34 years of a soil formation experiment in loamy marl (1992)
    Springer
    Biology and fertility of soils 13 (1992), S. 119-124 
    Details
    ISSN: 1432-0789
    Keywords: Long-term experiment ; Organic fertilization ; Soil organic matter ; Particle-size fractions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The concentrations of organic C and total N in five different particle-size fractions were studied under different mineral and organic fertilizer regimens by examining soil samples from the 34-year-old soil-formation pot experiment Hu 3 in Rostock. The C and N concentrations were generally highest in the clay fraction and decreased in the order medium silt 〉fine silt 〉coarse silt and sand. For nearly all years and size fractions the following order was obtained for C and N concentrations under the various fertilizer regimens: Compost 〉farmyard manure 〉straw + mineral fertilizer 〉mineral fertilizer. The various particle-size fractions and fertilizer regimens differed in the development of soil organic matter levels. Consequently, characteristic redistributions were found in the proportions of C and N in the various particle-size fractions, particularly after organic fertilizer was no longer applied (years 20–34). This experimental phase was characterized by decreased organic C and increased total N concentrations, and increased proportions of C and N in the clay-size at the expense of the sand fractions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337346
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  • 2
    Electronic Resource
    Electronic Resource
    Mutants affecting position-effect heterochromatinization in Drosophila melanogaster (1982)
    Springer
    Chromosoma 85 (1982), S. 539-551 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The dominant suppressor Su(var)b 101 and the dominant enhancer En(var)c 101 were found to affect significantly white variegation in a strongly variegating line of the w m4 chromosome (w m4h ) which has been used as standard rearrangement for a genetic dissection of position-effect variegation (Reuter and Wolff, 1981). Both mutations were also shown to affect position-effect heterochromatisation in T(1;4)w m258-21 and variegation in all the rearrangements tested (white, brown, scute and bobbed variegation). These results suggest that the genes identified encode functions essential for the manifestation of gene inactivation in position-effect rearrangements. It seems also reasonable to assume that in all the rearrangements tested identical heterochromatisation processes lead to inactivation of the genes whose phenotype is variegated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327349
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  • 3
    Electronic Resource
    Electronic Resource
    Functional properties of the heterochromatic sequences inducing w m4 position-effect variegation in Drosophila melanogaster (1985)
    Springer
    Chromosoma 93 (1985), S. 132-139 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In position-effect variegation euchromatic genes are brought into the vicinity of heterochromatic sequences as a result of chromosomal rearrangements. This results in the inactivation of these genes in a proportion of cells causing a variegated phenotype. Tartof et al. (1984) have shown that the flanking heterochromatin in the w m4 variegating rearrangement in Drosophila melanogaster is homologous to the Type I inserts found in some portions of the rDNA repeats. We have studied the functional properties of these sequences using 51 revertant chromosomes, several variant lines of w m4 , strong enhancer mutations of position-effect variegation and X heterochromatin deletions. Our results suggest an array of tandemly repeated sequences showing additive effects and probably subject to magnification and reduction in number. Since only 3 of the 51 revertants isolated do not show variegation if strong enhancer mutations are introduced, only a very short sequence must be essential for the induction of white gene inactivation in w m4 . This suggests that the heterochromatic junction itself is sufficient to initiate the variegation of an adjacent gene. Parental source as well as paternal effects on the activity of these sequences have been detected. Revertant chromosomes of w m4 can be found after P-directed mutagenesis in hybrid dysgenic crosses suggesting mobile genetic elements at the breakpoints of inversion w m4 . These results are discussed with respect to the structural basis of positioneffect variegation as well as the function of certain heterochromatic sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293160
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of two ornithine carbamoyltransferases from Pseudomonas syringae pv. phaseolicola, the producer of phaseolotoxin (1987)
    Springer
    Archives of microbiology 147 (1987), S. 174-178 
    Details
    ISSN: 1432-072X
    Keywords: Pseudomonas syringae pv. phaseolicola ; Ornithine carbamoyltransferases ; Phaseolotoxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two ornithine carbamoyltransferases (OCT 1 and OCT 2) were isolated from Pseudomonas syringae pv. phaseolicola and purified by precipitation with ammonium sulfate, heat denaturation, chromatography on DEAE-Sephadex A-50 and Sephadex G-200. Molecular weights of both enzymes: 110,000; optimal activity: pH 8.5 to 9.5 (OCT 1), pH 8.4 (OCT 2); apparent K m for ornithine: 7·10-4 (both enzymes); apparent K m for carbamoylphosphate: 7·10-4 (OCT 1), 2.8·10-3 (OCT 2). Both enzymes possess only an anabolic function. OCT 1 is highly inhibited by low concentrations of phaseolotoxin and Orn-P(O)(NH2)-NH-SO3H, OCT 2 is insensitive to both compounds. The inhibition of OCT 1 is reversible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415280
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  • 5
    Electronic Resource
    Electronic Resource
    Sialic acid-containing lipopolysaccharides in purple nonsulfur bacteria (1988)
    Springer
    Archives of microbiology 150 (1988), S. 584-589 
    Details
    ISSN: 1432-072X
    Keywords: Lipopolysaccharide ; Sialic acids ; Core region ; Purple nonsulfur bacteria ; N-Acetylneuraminic acid ; Rhodobacter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipopolysaccharides (LPS) from a number of purple nonsulfur bacteria and of phylogenetically related species were analyzed for the presence of sialic acid by gas chromatography/mass spectrometry. Species and strains of the genera Rhodobacter, Rhodopseudomonas, Rhodomicrobium, Rhodospirillum, Rhodocyclus and Rhodopila were investigated, sialic acid, however, was found only in the genus Rhodobacter. It occurs in strains of Rhodobacter capsulatus, R. sphaeroides, R. sulfidophilus and R. veldkampii. All these species belong to the α-3 subgroup of purple bacteria as defined by 16S rRNA catalogues. Approximately equimolar ratios of sialic acid and of 2-keto-3-deoxy-octonate (KDO) were found in isolated LPSs. Sodium deoxycholate gel electrophoresis of these LPS-samples also suggested a location of sialic acid in the LPS “core” region. Sialic acid was present only in those LPSs, which exhibited a “complete core region”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408254
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  • 6
    Electronic Resource
    Electronic Resource
    Solution growth and some physical properties of a new lithium iodate–iodic acid solution (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 261-264 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A method is described for the growth from aqueous solution of Li1 - xHxIO3 single crystals. Unit-cell parameter, low-frequency resistivity and the temperature dependence of the α - β transition for several x values were determined. With an increase in x there is an increase in a0 and a decrease in C0 compared with the lattice constants of LiIO3. The maximum increase in a0 is 0.082 Å and the maximum decrease of C0 is 0.219 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477000667
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  • 7
    Electronic Resource
    Electronic Resource
    Is hair dyed with PPD-like dyes allergenic? (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 6 (1980), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1980.tb03930.x
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  • 8
    Electronic Resource
    Electronic Resource
    Allergic contact dermatitis to plastic table cloth and phenyl indole (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 8 (1982), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1982.tb04145.x
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  • 9
    Electronic Resource
    Electronic Resource
    Allergy to 2 new corticoid molecules (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 11 (1984), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 6 cases of hypersensitivity to Tixocortol pivalate and 3 to Amcinonide are reported. The 9 female patients all presented with features of contact dermatitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1984.tb00932.x
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  • 10
    Electronic Resource
    Electronic Resource
    Biosynthesis of Citrulline in Plants (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 447-447 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To examine the possibility of activity of carbamyl phosphate in seaweeds, different green, brown, and red algae were ground in a mortar with tris buffer pH. 8 at + 4 C. The extract, being usually weakly acid, was brought up to pH. 8 with sodium bicarbonate, centrifuged (30 min. at 7,000 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190447a0
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