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  • 1995-1999  (24)
  • 1980-1984  (2)
  • 1945-1949  (1)
  • 1997  (11)
  • 1996  (13)
  • 1980  (2)
  • 1949  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Association of human herpes virus 6 (HHV-6) with multiple sclerosis: Increased IgM response to HHV-6 early antigen and detection of serum HHV-6 DNA (1997)
    [s.l.] : Nature Publishing Group
    Nature medicine 3 (1997), S. 1394-1397 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Viruses have long been suggested to be involved in the etiology of multiple sclerosis (MS)1. This suggestion is based on (1) epidemiological evidence of childhood exposure to infectious agents and increase in disease exacerbations with viral infection1,2; (2) geographic association of disease ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm1297-1394
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    2-Methylperimidinium Acetate Monohydrate (1997)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 130-132 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270196012589
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Light on the Combustion of Hydrocarbons (1949)
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 883-885 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE slow combusfcfon of hydrocarbons in general takes place bv/Tkinetic process which Semenov1 described as a ofiain reaction showing 'degenerate branching'. Ap^ording to this conception, the hydrocarbon is firac oxidized to a moderately stable intermediate, TOmch is itself oxidized to the final ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163883a0
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  • 4
    Electronic Resource
    Electronic Resource
    Low-Temperature Structure of Two Copper-Based Precursors for MOCVD: Aquabis(tert-butyl acetoacetato)copper(II) and Bis(dipivaloylmethanido)copper(II) (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 891-894 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195012157
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrification of ammonium in different components of a flooded rice soil system (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 321-326 
    Details
    ISSN: 1432-0789
    Keywords: Nitrification ; Flooded rice soils ; Rhizosphere ; Rice variety ; Crop growth stage ; Organic amendment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrification associated with the various components [subsurface soil from unplanted and planted (rhizosphere) fields, standing water and surface soil from planted and unplanted fields and leaf sheath suspensions] of submerged rice paddies was examined in incubation experiments with solutions inoculated with soil or water samples. Substantial nitrification occurred in all samples, standing water and surface soil samples in particular, during their 40-day incubation with NH 4 + −N. Almost all the NH 4 + −N, disappeared during incubation with standing water, was recovered as NO inf3 sup- −N. This, compared to 70–80% from all soil samples and only 29% from leaf sheath suspensions. Significant loss of nitrogen, especially from leaf sheath suspensions, is probably due to nitrification-denitrification as evidenced by its complete recovery in the presence of N-Serve. Nitrification potential of the soil and water samples varied with the crop growth stage and was more pronounced at tillering and panicle inititation stages than at other stages. Nitrification potential of samples from green-manure-amended plots was distinctly less than that of samples from control and urea-amended plots. Most probable number (MPN) estimates of ammonium-oxidizing bacteria were always higher in surface soil in both planted and unplanted plots at all stages of crop growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335961
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  • 6
    Electronic Resource
    Electronic Resource
    Incomplete mixing in large bioreactors — a study of its role in the fermentative production of streptokinase (1996)
    Springer
    Bioprocess and biosystems engineering 14 (1996), S. 91-96 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The production of streptokinase in a batch fermentation has been analysed for the role of incomplete macromixing of the broth. The analysis is based on a kinetic model exhibiting inhibition by the substrate and a primary metabolite (lactic acid), and a mixing model comprising two continuous flow reactors (CFRs) with closed-loop recycle. The inoculum is introduced into one region (one CFR) and the mixing process determines its distribution, growth and reactivity. By varying the dilution rates of the CFRs, any degree of macromixing can be simulated. For dilution rates larger than 1.0 h−1 almost complete macromixing is achieved, for which an analogy has been drawn with micromixing. Increasing the volume of the inoculated region relative to the noninoculated region improves the maximum attainable activity of streptokinase and shortens the time for this. In such a situation an imperfectly mixed bioreactor is superior to a perfectly mixed one, implying that good productivity requires a large inoculated region and incomplete macromixing. These inferences are supported by earlier studies of fluid mixing and relaxation times in bioreactors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387962
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  • 7
    Electronic Resource
    Electronic Resource
    Start-up sensitivity to the initial state of a batch bioreactor for a recombinant Escherichia coli in a complex medium (1996)
    Springer
    Bioprocess and biosystems engineering 15 (1996), S. 215-219 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The sensitivities with respect to the initial state of five key variables describing the performance of a batch bioreactor have been computed from an experimentally validated kinetic model. The system has a recombinant Escherichia coli strain containing the plasmid pBR Eco gap, which codes for glyceraldehyde-3-phosphate dehydrogenase (GAPDH) in a complex medium. Since previous studies have shown the start-up sensitivities to be particularly important, the initial 10% of the duration of fermentation was chosen as the time span. The sensitivities of the cell mass, GAPDH and acetate increased with time while those of glucose and yeast extract remained practically constant. Acetate has a crucial role as it functions as both a product and a reactant. With no acetate in the inoculum, the sensitivities of acetate increased an order of magnitude faster than other sensitivities. However, upon addition of acetate through the inoculum, its sensitivities decreased the fastest and stabilised beyond a starting concentration of about 1 g/l whereas other sensitivities stabilised after 5 to 6 g/l of initial acetate. A three-dimensional envelope in the space of acetate concentration-time-relative sensitivity shows a locus of concentrations for minimum time-dependent acetate sensitivity; this may be maintained through fed-batch operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369485
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrification of ammonium in different components of a flooded rice soil system (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 321-326 
    Details
    ISSN: 1432-0789
    Keywords: Key words Nitrification ; Flooded rice soils ; Rhizosphere ; Rice variety ; Crop growth stage ; Organic amendment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrification associated with the various components [subsurface soil from unplanted and planted (rhizosphere) fields, standing water and surface soil from planted and unplanted fields and leaf sheath suspensions] of submerged rice paddies was examined in incubation experiments with solutions inoculated with soil or water samples. Substantial nitrification occurred in all samples, standing water and surface soil samples in particular, during their 40-day incubation with NH4 +-N. Almost all the NH4 +-N, disappeared during incubation with standing water, was recovered as NO3 –-N. This, compared to 70–80% from all soil samples and only 29% from leaf sheath suspensions. Significant loss of nitrogen, especially from leaf sheath suspensions, is probably due to nitrification-denitrification as evidenced by its complete recovery in the presence of N-Serve. Nitrification potential of the soil and water samples varied with the crop growth stage and was more pronounced at tillering and panicle inititation stages than at other stages. Nitrification potential of samples from green-manure-amended plots was distinctly less than that of samples from control and urea-amended plots. Most probable number (MPN) estimates of ammonium-oxidizing bacteria were always higher in surface soil in both planted and unplanted plots at all stages of crop growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335961
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  • 9
    Electronic Resource
    Electronic Resource
    Micropropagation of Hemidesmus indicus (L.) R. Br. through axillary bud culture (1996)
    Springer
    Plant cell reports 15 (1996), S. 427-430 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT. A procedure for rapid in vitro propagation of the aromatic and medicinal plant Hemidesmus indicus (L.) R.Br. (Family Asclepiadeceae) from nodal explants is described. The highest shoot multiplication rate of 8.2±0.4 shoots/explant with a 95% frequency was achieved in 5 weeks culture period on Murashige and Skoog medium supplemented with 1.15 μM kinetin and 0.054 μM α-naphthaleneacetic acid. Excised shoots were rooted on the same basal medium supplemented with 1.15 μM kinetin and 7.35 μM indole-3-butyric acid. Shoots derived from subcultures exhibited better rooting response than those from primary cultures. After a hardening phase of 2 weeks, there was a 70% transplantation success in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050047
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  • 10
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plantlet regeneration from cell suspension cultures of palmarosa grass (Cymbopogon martinii) (1997)
    Springer
    Plant cell reports 16 (1997), S. 430-434 
    Details
    ISSN: 1432-203X
    Keywords: Key words Cell suspension culture ; Cymbopogon martinii ; Monocot ; Palmarosa ; Plant regeneration ; Somatic embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A cell suspension culture was established from nodal callus of Cymbopogon martinii (Roxb.) Wats in a liquid medium containing Murashige and Skoog (1962) basal salts, vitamins, 100 mg l–1 myo-inositol and 20 g l–1 of sucrose (MS) that was supplemented with 13.6 µM 2,4-dichlorophenoxyacetic acid and 1.15 µM kinetin. An initial inoculum density of 2 × 104 cells ml–1 exhibited optimum cell growth. Calli were obtained 12–15 days after the suspension was plated onto semisolid medium of a similar composition. When calli were transferred to semisolid regeneration medium containing MS + 6.7 µM N 6-benzyl-adenine + 1.15 µM kinetin, somatic embryogenesis and plantlet regeneration occurred after 10–25 days. There was no significant decrease in the regeneration potential of the calli even when the cultures were initiated from 47-week-old cell suspensions. Chromosome counts of cells in suspensions, calli and somatic embryos derived from cultures of different ages revealed the presence of diploids, tetraploids and octaploids. However, the 33 regenerated plants tested were all diploid, indicating that only diploid cells were capable of regeneration in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01146788
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