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  • Elsevier  (37)
  • American Physical Society  (17)
  • Wiley-Blackwell  (8)
  • Blackwell Publishing Ltd  (4)
  • American Journal of Science  (2)
  • American Physical Society (APS)
  • 1990-1994  (47)
  • 1970-1974  (21)
  • 1
    Electronic Resource
    Electronic Resource
    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
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb37771.x
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1993.tb00483.x
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb03520.x
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb02510.x
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  • 5
    Electronic Resource
    Electronic Resource
    CO2 laser welding of polymers (1992)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 582-585 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Deep penetration welding of polymers can be carried out at high speed with relatively low laser power. This results from an efficient coupling CO2 laser radiation to polymers that leads to volume heating. A brief review of energy coupling and heat transfer effects in polymers under CO2 laser welding conditions is given. Some examples of low power (10 to 100 watt) CO2 welding of polypropylene and polyethylene at depths of up to 1.5 cm are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760320903
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  • 6
    Electronic Resource
    Electronic Resource
    Der Gradient der Wöhlerkurve (1974)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 5 (1974), S. 407-412 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Gradient of the S, N-curve. The classical two-parameter basic equations of Wöhler and Basquin and also the four-parameter equation of Palmgren/Weibull approximate the Wöhler curve in certain ranges only. They fail in particular when one attempts to use them to convert a service life increase into the appropriate gain in strength. For a more exacting analysis these approximations must be replaced by models of the Wöhler curve which are nearer to actual reality.
    Notes: Die klassischen Zwei-Parameter-Ansätze von Wöhler und Basquin, aber auch der Vier-Parameter-Ansatz von Palmgren/Weibull approximieren die S, N-Kurve nur bereichsweise; vor allem versagen sie, wenn man sich ihrer bedienen will, um eine erzielte Lebensdauersteigerung in den entsprechenden Festigkeitsgewinn umzurechnen: Bei anspruchsvolleren Analysen müssen diese Approximationen durch wirklichkeitsnähere Modelle der Wöhlerkurve ersetzt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19740050803
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  • 7
    Electronic Resource
    Electronic Resource
    Mikrobielle Werkstoffzerstörung - Biofilm und Biofouling: Biofilme in industriellen Wasserkreisläufen. Fallbeispiel: Prozeßwassersystem einer Papierfabrik (1994)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 45 (1994), S. 65-67 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microbial deterioration of materials - biofilm and biofouling: Biofilms in industrial water circuits. Case history: Process water system in a paper factory
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19940450113
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  • 8
    Electronic Resource
    Electronic Resource
    Elektrophile Additionen an cis,cis-Cyclooctadien-(1,5) (1970)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 312 (1970), S. 622-634 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Elektrophile Additionen an Cyclooctadien-(1,5) können unter transannularer Beteiligung der zweiten Doppelbindung zu Bicylo [3,3,0] octanderivaten führen. Diese entstehen allerdings nur, wenn starke Protonsäuren, starke Lewis-Säuren oder Chlor als elektrophile Agenzien angewandt werden.Elektrophile Additionen in Methanol oder in Essigsäure als Lösungsmittel führen im ersten Reaktionsschritt vorzugsweise zu nicht umgelagerten Dreikomponentenprodukten; der elektrophile Angriff auf die zweite Doppelbindung erfolgt dann unter transannularer Beteiligung der OMe- oder OAc-Gruppe und führt zu Gemischen aus 9-Oxa-bicyclo[3,3,1]-nonan- und 9-Oxa-bicyclo[4,2,1]nonan-Derivaten.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19703120412
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  • 9
    Electronic Resource
    Electronic Resource
    Über Fluorchemie. XXVI. Darstellung von Butadien und Perfluorbutadien aus Vinyl- und Perfluorvinylpentafluorosilikaten (1970)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 312 (1970), S. 150-160 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei Umsetzungen von Natrium-, Kalium- oder Ammoniumvinylpentafluorosilikat mit Silbernitrat oder Kupfersulfat wurden Äthylen und Butadien erhalten. Trifluorvinyltrichlorsilan gab mit Antimontrifluorid Trifluorvinyltrifluorsilan, woraus sich mit Kalium-, Natrium- und Ammoniumfluorid in aprotonischen Lösungsmitteln die entsprechenden Trifluorvinylpentafluorosilikate gewinnen ließen. Bei deren Umsetzung mit Silbernitrat bzw. Kupfersulfat entstanden Trifluoräthylen bzw. ein Gemisch von diesem mit Hexafluorbutadien. Das Verhältnis, in dem sich diese. Gase jeweils bildeten, ist von Menge und Art des eingesetzten Schwermetallsalzes stark abhängig.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19703120119
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  • 10
    Electronic Resource
    Electronic Resource
    Steroid Total Synthesis, Part VIIIPart VII, see [1].; (+)-estr-4-ene-3,17-dione (1972)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 55 (1972), S. 2663-2673 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel synthesis of the title compound, involving the resolution of a Mannichbase derived from racemic 11,11-o-phenylenedioxy-7-hydroxy-1-dodecen-3-one is described. In an alternate approach 2(S)-acetamido-6,6-o-phenylenedioxy-heptanoic acid was used as the optically active starting material. This scheme features the preparation of a chiral 1,2-epoxide and its regiospecific alkylation with lithio-1, 1-diethoxy-2-propyne.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19720550746
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