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  • Artikel  (588)
  • Springer  (573)
  • Oxford University Press  (7)
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  • Artikel  (588)
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  • 1
    Digitale Medien
    Digitale Medien
    An Attempt to Map Two Genes for Tuberous Sclerosis Using Novel Two-Point Methods (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 615 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb37771.x
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  • 2
    Digitale Medien
    Digitale Medien
    ATP-dependent carbon transport in perfused Chara cells (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 16 (1993), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Carbon transport across the plasma membrane, and carbon fixation were measured in perfused Chara internodal cells. These parameters were measured in external media of pH 5·5 and pH 8·5, where CO2 and HCO3- are, respectively, the predominant carbon species in both light and dark conditions. Cells perfused with medium containing ATP could utilize both CO2 and HCO3- from the external medium in the light. Photosynthetic carbon fixation activity was always higher at pH 5·5 than at pH 8·5. When cells were perfused either with medium containing hexokinase and 2-deoxyglucose to deplete ATP from the cytosol (HK medium) or with medium containing vanadate, a specific inhibitor of the plasma membrane H+-ATPase (V medium), photosynthetic carbon fixation was strongly inhibited at both pH 5·5 and 8·5. Perfusion of cells with medium containing pyruvate kinase and phosphoenolpyruvate (PEP) to maximally activate the H+-ATPase (PK medium), stimulated the photosynthetic carbon fixation activities. Oxygen evolution of isolated chloroplasts and the carbon fixation of cells supplied 14C intracellularly were not inhibited by perfusion media containing either hexokinase and 2-deoxyglucose or vanadate. The results indicate that Chara cells possess CO2 and HCO3- transport systems energized by ATP and sensitive to vanadate in the light. In the dark, intact cells also fix carbon. By contrast, in cells perfused with medium containing ATP, no carbon fixation was detected in 1 mol m -3 total dissolved inorganic carbon (TDIC) at pH 8·5. By increasing TDIC to 10 mol m-3, dark fixation became detectable, although it was still lower than that of intact cells at 1mol m-3 TDIC. Addition of PEP or PEP and PEP carboxylase to the perfusion media significantly increased the dark-carbon fixation. Perfusion with vanadate had no effect on the dark-carbon fixation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.1993.tb00483.x
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  • 3
    Digitale Medien
    Digitale Medien
    Sequence diversity of Mhc genes in lake whitefish (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: The sequence variation of three exons of the major histocompatibility complex (Mhc) was examined in a lake whitefish Coregonus sp., population from the Swiss lake of Hallwil. DNA sequences from the Mhc class I A1, A2 and class II B1 exons, corresponding to the α1, α2 and β1 domains of the Mhc glycoproteins, were obtained by the polymerase chain reaction followed by cloning and sequencing. The numbers of variable sequences detected for each exon were 15 (A1), 11 (A2) and 20 (B1). Levels of nucleotide similarity ranged from 82 to 99% for the A1 exon, 58–96% for the A2 and 88–99% for the B1 exon. At the A1 and B1 exons, the nonsynonymous substitution rates (dn) exceeded synonymous substitution rates (ds) greatly within the peptide binding regions, indicating the effect of balancing selection. Sequence diversity at the A2 exon did not seem to be maintained by balancing selection (ds 〉 dn). Phylogenetic comparison of whitefish Mhc sequences with sequences from other salmonid species and more distantly related teleosts indicated shared ancestral (trans-species) polymorphism.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb02258.x
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  • 4
    Digitale Medien
    Digitale Medien
    Size of prey ingested by whitefish, Coregonus sp., larvae. Are Coregonus larvae gape-limited predators? (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 36 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: The feeding ecology of whitefish, Coregonus, larvae in oligotrophic Lake Sarnen and eutrophic Lake Hallwil is presented, taking into consideration the size of the prey ingested in relation to the mouth size of larvae and to the availability of zooplankton.When larvae grow from 10 to 16 mm their mouth width increases from 500 to 1000 μm while their gape height, with the mouth open at 45 and 90°, increases from 200 to 400 μm and from 400 to 700 μm, respectively, whichever lake is considered.The differences found in the mean prey width between the two lakes arise in part from the composition of diets, and in part from differences in size of the available prey organisms. Whatever the origin of the larvae and the taxon we consider, larvae seem to ingest the most abundant prey size without selecting the biggest ones available even if, from a mechanical point of view, they would be able to ingest them.Taking into account the generally low density of zooplankton in the uppermost layer of the lake, we conclude that whitefish larvae eat in the manner such as to decrease the cost of prey capture, in terms of energy and time, by choosing the more abundant prey available.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb03520.x
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  • 5
    Digitale Medien
    Digitale Medien
    Palaeomagnetic Results From the Tibetan Sedimentary Series of the Manang Area (North Central Nepal) (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 104 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The remanent magnetization of Palaeozoic and Mesozoic carbonates from the Tibetan Sedimentary Series (TSS) of the Manang area north of the Annapurna Range (north central Nepal) has been investigated. the TSS forms part of the tectonic unit between the Indian-Eurasian plate boundary in the north and the Main Central Thrust (MCT) in the south.Apart from a present field direction, three remanence components have been separated: a normal polarity, post-folding remanence (negative fold test) is carried by pyrrhotite (the core corrected mean direction for five sites with 47 specimens from Silurian/Devonian rocks is decl. = 312.9°, incl. = 58.3°α95= 17.6°, K= 19.8). the origin of this component is not understood.A more precisely determined, reversed polarity, post-folding remanence (99 per cent negative fold test) is also carried by pyrrhotite (the core corrected mean direction for 12 sites with 229 specimens from Carboniferous/Triassic rocks is decl. = 196.4°, incl. = -65.9°, α95= 3.2°, k = 183).One site of Lower Carinan age shows—in addition to the pyrrhotite component— a second, stable remanence direction carried by magnetite. the fold test is 99 per cent positive and there is a high probability that the remanence is of detrital origin (the bedding corrected direction for one site with 40 specimens is decl. =334.3°, incl. = -54.1°, α95= 4.2°, k = 30.2, palaeolatitude 34.6°S).The direction of the magnetite component coincides with other Triassic palaeodirection data from the literature and the inclination suggests a palaeoposition of the TSS at the northern margin of India at this time. the northern extent of India in the Triassic cannot be reconstructed from the data because of the strong anticlockwise rotation (48°) of stable India since this time.The inclination of the reverse polarity pyrrhotite component is 19° steeper than expected from the maximum northern position of the area. This suggests a regional northward tilt along the MCT which is supported by steep inclinations found in other areas.Declination data for the reverse polarity pyrrhotite component and for the magnetite component deviate clockwise from expected values for the area by 23°-34° (calculated from the Indian APWP). Utilizing Klootwijk, Conaghan & Powell's (1985) rotational underthrusting model, the minimum magnitude of continental underthrusting between the TSS and stable India at the longitude of central Nepal (84°E) has been calculated from the declination of our reverse polarity pyrrhotite component. A possible range of 520–1100 km results from consideration of different tectonic models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb02510.x
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  • 6
    Digitale Medien
    Digitale Medien
    α-Vertex separator is NP-hard even for 3-regular graphs (1991)
    Springer
    Computing 46 (1991), S. 343-353 
    Details
    ISSN: 1436-5057
    Schlagwort(e): PLA-folding ; vertex separation ; complexity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Zwei diskrete Optimierungsprobleme beim VLSI-Design sind die Fläche eines programmierbaren logischen Arrays (PLA) zu reduzieren und einen Graphen in möglichst gleich große Teilgraphen zu zerlegen. Wir zeigen, daß eine in der Praxis oft benutzte Flächenreduktionstechnik, das Blockfolding, äquivalent ist zu dem Problem, Graphen durch Wegnahme von Knoten zu zerlegen. Es wird gezeigt, daß dieses Problem schon für 3-reguläre GraphenNP-schwer ist.
    Notizen: Abstract Two discrete optimization problems arising in VLSI are to reduce the area of a programmable logic array (PLA) and to separate graphs uniformly. We show that a commonly used area reduction technique called blockfolding is equivalent to separating graphs by vertex deletion. The later problem is shown to be NP-complete even for 3-regular-graphs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02257778
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  • 7
    Digitale Medien
    Digitale Medien
    Neutron scattering studies of Bi2Sr2Ca0.5Ho0.5Cu2O8+x (1991)
    Springer
    The European physical journal 85 (1991), S. 35-41 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neutron scattering has been employed to study the crystalline electric field (CEF) interaction at the Ho3+ site in Bi2Sr2Ca0.5Ho0.5Cu2O8+x. The observed energy spectra exhibit a large number of broad but well-resolved CEF transitions between 1.2 and 73 meV, so that we have been able to unambiguously determine all nine CEF parameters required for the average orthorhombic symmetry. The unusually large line widths of the CEF transitions are shown to be related to the modulated structure. The CEF potential is essentially governed by the charge distribution of the CuO2 planes which turns out to be very similar as in HoBa2Cu3O7-x.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01387785
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  • 8
    Digitale Medien
    Digitale Medien
    Lactic acid production from enzyme-thinned corn starch usingLactobacillus amylovorus (1991)
    Springer
    Journal of industrial microbiology and biotechnology 7 (1991), S. 27-34 
    Details
    ISSN: 1476-5535
    Schlagwort(e): Bacterium ; Fermentation ; Nutrition ; Optimization ; Liquefaction ; High-substrate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary An alternative process for industrial lactic acid production was deveooped using a starch degrading lactic acid producing organism,Lactobacillus amylovorus B-4542. In this process, saccharification takes place during the fermentation, eliminating the need for complete hydrolysis of the starch to glucose prior to fermentation. The cost savings of this alternative are substantial since it eliminates the energy input, separate reactor tank, time, and enzyme associated with the typical pre-fermentation saccharification step. The only pre-treatment was gelatinization and enzyme-thinning of the starch to overcome viscosity problems associated with high starch concentrations and to make the starch more rapidly degradable. This fermentation process was optimized for temperature, substrate level, nitrogen source and level, mineral level, B-vitamins, volatile fatty acids, pH, and buffer source. The rate of the reaction and the final level of lactic acid obtained in the optimized liquefied starch process was similar to that obtained withL. delbrueckii B-445 using glucose as the substrate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01575599
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  • 9
    Digitale Medien
    Digitale Medien
    2,3,7,8-TCDD and 2,3,7,8-TCDF in blue crabs and American lobsters from the Hudson-Raritan estuary and the New York bight (1994)
    Springer
    Bulletin of environmental contamination and toxicology 52 (1994), S. 734-741 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00195496
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  • 10
    Digitale Medien
    Digitale Medien
    Depth to basement and geoid expression of the Kane Fracture Zone: A comparison (1991)
    Springer
    Marine geophysical researches 13 (1991), S. 105-129 
    Details
    ISSN: 1573-0581
    Schlagwort(e): Geoid topography ; fracture zone morphology ; satellite altimetry ; transform fault ; plate reconstructions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Geoid data from Geosat and subsatellite basement depth profiles of the Kane Fracture Zone in the central North Atlantic were used to examine the correlation between the short-wavelength geoid (λ=25–100 km) and the uncompensated basement topography. The processing technique we apply allows the stacking of geoid profiles, although each repeat cycle has an unknown long-wavelength bias. We first formed the derivative of individual profiles, stacked up to 22 repeat cycles, and then integrated the average-slope profile to reconstruct the geoid height. The stacked, filtered geoid profiles have a noise level of about 7 mm in geoid height. The subsatellite basement topography was obtained from a recent compilation of structure contours on basement along the entire length of the Kane Fracture Zone. The ratio of geoid height to topography over the Kane Fracture Zone valley decreases from about 20–25 cm km-1 over young ocean crust to 5–0 cm km-1 over ocean crust older than 140 Ma. Both geoid and basement depth of profiles were projected perpendicular to the Kane Fracture Zone, resampled at equal intervals and then cross correlated. The cross correlation shows that the short-wavelength geoid height is well correlated with the basement topography. For 33 of the 37 examined pro-files, the horizontal mismatches are 10 km or less with an average mismatch of about 5 km. This correlation is quite good considering that the average width of the Kane Fracture Zone valley at median depth is 10–15 km. The remaining four profiles either cross the transverse ridge just east of the active Kane transform zone or overlie old crust of the M-anomaly sequence. The mismatch over the transverse ridge probably is related to a crustal density anomaly. The relatively poor correlation of geoid and basement depth in profiles of ocean crust older than 130–140 Ma reflects poor basement-depth control along subsatellite tracks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00286284
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