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  • Springer  (40)
  • 1
    Electronic Resource
    Electronic Resource
    Autotrophic carbon dioxide fixation in Acidianus brierleyi (1997)
    Springer
    Archives of microbiology 166 (1997), S. 368-371 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsAcidianus brierleyi ; Reductive tricarboxylic ; acid cycle ; 3-Hydroxypropionate cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The autotrophic CO2 fixation pathway in Acidianus brierleyi, a facultatively anaerobic thermoacidophilic archaebacterium, was investigated by measuring enzymatic activities from autotrophic, mixotrophic, and heterotrophic cultures. Contrary to the published report that the reductive tricarboxylic acid cycle operates in A. brierleyi, the enzymatic activity of ATP:citrate lyase, the key enzyme of the cycle, was not detected. Instead, activities of acetyl-CoA carboxylase and propionyl-CoA carboxylase, key enzymes of the 3-hydroxypropionate cycle, were detected only when A. brierleyi was growing autotrophically. We conclude that a modified 3-hydroxypropionate pathway operates in A. brierleyi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682981
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  • 2
    Electronic Resource
    Electronic Resource
    Phylogenetic position of an obligately chemoautotrophic, marine hydrogen-oxidizing bacterium, Hydrogenovibrio marinus, on the basis of 16S rRNA gene sequences and two form I RuBisCO gene sequences (1998)
    Springer
    Archives of microbiology 169 (1998), S. 364-368 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsHydrogenovibrio marinus ; Hydrogen-oxidizing bacterium ; Marine bacteria ; Obligate chemolithoautotroph ; Form I RuBisCO ; sequences ; 16S rRNA gene sequence ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two form ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) genes from the obligately autotrophic, marine hydrogen oxidizer Hydrogenovibrio marinus were sequenced. The deduced amino acid sequences of both RuBisCOs revealed that they are similar to those of sulfur oxidizers (Thiobacillus) and a purple sulfur bacterium (Chromatium vinosum). According to the 16S rRNA gene sequences, H. marinus is also affiliated with these microorganisms, members of Thiomicrospira being the closest relatives. Sequence similarities of the 16S rRNA genes and of the RuBisCO genes among these γ-Proteobacteria suggest a common autotrophic ancestry. An ancestor of purple sulfur bacteria might be a common root of H. marinus and related sulfur oxidizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050584
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  • 3
    Electronic Resource
    Electronic Resource
    Purification and characterization of pyruvate:ferredoxin oxidoreductase from Hydrogenobacter thermophilus TK-6 (1997)
    Springer
    Archives of microbiology 167 (1997), S. 275-279 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsHydrogenobacter thermophilus ; Reductive tricarboxylic acid cycle ; Pyruvate:ferredoxin ; oxidoreductase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pyruvate:ferredoxin oxidoreductase was purified to electrophoretic homogeneity from an aerobic, thermophilic, obligately chemolithoautotrophic, hydrogen-oxidizing bacterium, Hydrogenobacter thermophilus TK-6, by precipitation with ammonium sulfate and fractionation by DEAE-Sepharose CL-6B, polyacrylate-quaternary amine, hydroxyapatite, and Superdex-200 chromatography. The native enzyme had a molecular mass of 135 kDa and was composed of four different subunits with apparent molecular masses of 46, 31.5, 29, and 24.5 kDa, respectively, indicating that the enzyme has an αβγδ-structure. The activity was detected with pyruvate, coenzyme A, and one of the following electron acceptors in substrate amounts: ferredoxin isolated from H. thermophilus, FAD, FMN, triphenyltetrazolium chloride, or methyl viologen. NAD, NADP, and ferredoxins from Chlorella spp. and Clostridium pasteurianum were ineffective as the electron acceptor. The temperature optimum for pyruvate oxidation was approximately 80° C. The pH optimum was 7.6–7.8. The apparent K m values for pyruvate and coenzyme A at 70° C were 3.45 mM and 54 μM, respectively. The enzyme was extremely thermostable under anoxic conditions; the time for a 50% loss of activity (t 50%) at 70° C was approximately 8 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050443
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  • 4
    Electronic Resource
    Electronic Resource
    Consideration on intake of uranium through smoking (1989)
    Springer
    Journal of radioanalytical and nuclear chemistry 135 (1989), S. 157-164 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Uranium in Japanese tobacco leaves and in Japanese human hair was determined by the fission track method. It was found that the uranium content in smokers' hair was higher than that in non-smokers' one and a part of uranium was lost from tobacco leaves by ashing at 500–700 °C. These two results suggest that uranium would be inhaled through smoking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02164967
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  • 5
    Electronic Resource
    Electronic Resource
    A new approach in the evaluation of chromosome variants in man (1980)
    Springer
    Human genetics 〈Berlin〉 55 (1980), S. 327-331 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new approach is proposed for the evaluation of chromosome variants, which uses a scanning microdensitometer in the determination of the area of a variant. Results are assigned into five classes based on the difference from an average in terms of standard deviation. In the first two papers of the present series, results obtained in C variants of 1, 9, and 16 and LBA variants in 12 pairs lacking an established variable site (e.g., nos. 2, 5, 6, etc.) were described. In the present communication, results obtained in pairs with a known Q-variable site are described. When a variable region outside of ±1 SD of the average is defined as a variant, 9, 11, 7, 10, and 10 variants are detected in pairs 13, 14, 15, 21, and 22, respectively, from 12 individuals by means of LBA preparations, in addition to Q variants, which can be detected by the standard QFQ technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290212
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  • 6
    Electronic Resource
    Electronic Resource
    Organ-specific expression of β-glucuronidase activity driven by the Arabidopsis heat-shock promoter in heat-stressed transgenic Nicotiana plumbaginifolia (1999)
    Springer
    Plant cell reports 19 (1999), S. 92-95 
    Details
    ISSN: 1432-203X
    Keywords: Key words Arabidopsis HSP18.2 ; HSP promoter ; Heat shock ; GUS chimeric gene ; Nicotiana plumbaginifolia ; Organ-specific expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The expression of the Arabidopsis heat-shock protein (HSP) 18.2 promoter β-d-glucuronidase (GUS) chimera gene was studied in various organs of the transgenic Nicotiana plumbaginifolia during the recovery phase at normal temperatures (20–22  °C) following heat-shock (HS) treatment. The optimum HS temperature for GUS activity in the anthers, petals and capsules was 42  °C, but in immature seeds and the placentas of capsules it was 36  °C and 39  °C, respectively. No apparent GUS activity was observed in any organs except for dry seeds after HS at 45  °C, although the activity in dry seeds was apparent even after HS at 48  °C. After HS at 42  °C, GUS activity in the flower tissues was the highest before anthesis and declined thereafter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050716
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  • 7
    Electronic Resource
    Electronic Resource
    Delayed recovery of β-glucuronidase activity driven by an Arabidopsis heat shock promoter in heat-stressed transgenic Nicotiana plumbaginifolia (1999)
    Springer
    Plant cell reports 19 (1999), S. 96-100 
    Details
    ISSN: 1432-203X
    Keywords: Key words Arabidopsis HSP18.2 ; Heat shock protein promoter ; β-Glucuronidase ; Nicotiana plumbaginifolia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The expression of the Arabidopsis heat shock protein (HSP) 18.2 promoter-β-d-glucuronidase (GUS) chimera gene was investigated in transgenic Nicotiana plumbaginifolia plants during the recovery phase at normal temperatures (20–22  °C) after a heat shock (HS) treatment. GUS activity increased during the recovery phase after HS at 42  °C for 2 h, and maximal GUS activity was observed after 12 h at normal temperatures, at levels 50–100 times higher than the activity immediately after HS. After HS at 44  °C, little GUS activity was observed during the first 20–24 h at normal temperatures, but the activity increased gradually thereafter, to reach a maximum at 40–50 h. After HS at 45  °C, no GUS activity was observed throughout the experimental period. RT-PCR analysis showed that GUS mRNA remained for 10 h after a 2-h HS at 42  °C and for 40 h after a 2-h HS at 44  °C. These findings demonstrate that brief HS treatment, especially at a sublethal temperature, induces a long-term accumulation of HSP-GUS mRNA during the recovery phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050717
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  • 8
    Electronic Resource
    Electronic Resource
    Production of tropane alkaloids by transformed root cultures of Atropa belladonna in stirred bioreactors with a stainless steel net (1999)
    Springer
    Plant cell reports 18 (1999), S. 567-571 
    Details
    ISSN: 1432-203X
    Keywords: Key wordsAtropa belladonna ; Transformed root cultures ; Scale-up ; Tropane alkaloids ; Modified stirred bioreactors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A scale up of transformed root cultures of Atropa belladonna from a 300-ml flask to a 30-l tank was accomplished without any reduction in alkaloid productivity. Cutting treatment of seed cultures showed no distinct effect on root growth, morphology, and alkaloid content in conical flasks during 1 month of culture. Randomly cut roots thus grown were further cultivated in 3-l and 30-l modified stirred bioreactors for a scale-up culture. After 1 month of culture, 1490 mg of tropane alkaloids was produced by a 30-l culture of A. belladonna transformed roots. These roots contained the same level of atropine (5.4 mg/ g dw) as the roots of this plant grown in the field for 12 months and still contained a considerable amount of other alkaloids including 1.6 mg/g dw of 6-β-hydroxyhyoscyamine, 0.9 mg/g dw of scopolamine, and 2.0 mg/g dw of littorine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050623
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  • 9
    Electronic Resource
    Electronic Resource
    Local production rate of an “enzyme kinetics” based on coupled random walks (1980)
    Springer
    The European physical journal 39 (1980), S. 327-331 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Based on the coupled random walk process, a local production rate of an “enzyme kinetics” is studied. A substrate as a walker is specified by a set of the jumping probabilities between the sites and between the modes. The modes represent the states of the substrate before, in and after the reaction. The local production rate is explicitly given and its position dependence is studied in terms of jumping probabilities. Qualitatively, the deviations from the Michaelis-Menten's expression are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305832
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  • 10
    Electronic Resource
    Electronic Resource
    Loop calculations in confined QCD II. The self energy of massive quarks (1983)
    Springer
    The European physical journal 21 (1983), S. 127-132 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an explicit numerical evaluation of the self energy of confined massive quarks for the ground state of the MIT bag model. The calculation is performed in the Coulomb gauge, using a technique developed in part I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01648787
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