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  • Springer  (58)
  • Oxford University Press  (14)
  • American Physical Society
  • Geological Society of America (GSA)
  • 1990-1994  (73)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Plasticity in the egg-spacing behavior of a seed beetle: Effects of host deprivation and seed patchiness (Coleoptera: Bruchidae) (1992)
    Springer
    Journal of insect behavior 5 (1992), S. 609-621 
    Details
    ISSN: 1572-8889
    Keywords: oviposition behavior ; egg dispersion ; plasticity ; host deprivation ; resource patchiness ; Callosobruchus maculatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Egg-laying females of the seed beetle Callosobruchus maculatusdiscriminate between egg-free and egg-laden seeds and produce a nearly uniform distribution of eggs among seeds. We examined plasticity in this trait in response to both an internal factor (level of host deprivation) and an environmental one (the spatial configuration of available seeds). Responses to each factor were measured in genetically divergent strains that show a relatively strong (S strain) or weak (B strain) tendency to spread eggs evenly among seeds. Following a modest (10-h) period of host deprivation, S-strain females distributed their eggs less uniformly among seeds; the proportion of females committing at least one oviposition “mistake” increased from 20 to 50%. Similarly, S-strain females distributed their eggs less uniformly if seeds were presented in multiple, discrete patches instead of in a single, large patch. The higher frequency of oviposition mistakes in the multiple-patch arena was caused in part by females maintaining a uniform distribution of eggs within patches but not among patches. In contrast, females from the “sloppier” B strain were unaffected by either host deprivation or resource dispersion. Responses to seed patchiness are discussed in relation to the role of learning in the egg-spacing behavior of C. maculatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048008
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  • 2
    Electronic Resource
    Electronic Resource
    A dynamic model of the distribution of wealth among households and nations (1992)
    Springer
    Annals of operations research 37 (1992), S. 245-272 
    Details
    ISSN: 1572-9338
    Keywords: Distribution of wealth among households ; utility maximization over time ; the rate of time preference ; steady-state distribution of wealth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Stiglitz once showed that, in general, aggregate wealth is asymptotically uniformally distributed among individuals. However, in his formulation household saving is not the outcome of utility maximization over time. Constructing a simple dynamic general equilibrium model in which household saving is choice-theoretically determined, we show that given initial holdings of wealth there is a unique and stable steady state distribution of wealth and that the distribution of wealth becomes more even (resp. uneven) as time goes by if the total wealth is initially greater (resp. smaller) than its steady state level. We also study the response of the steady state equilibrium to the changes in initial distribution of wealth and the rate of time preference, and to several types of technological improvements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071059
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  • 3
    Electronic Resource
    Electronic Resource
    Do taste receptors respond to perturbation of water structure? (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 731-733 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The pmr spin-spin pulse relaxation times (T2 values) of the L-amino acids are examined in relation to their taste threshold values. There is an inverse trend between T2 value and threshold value with a good correlation for amino acids whose natural pH is close to neutrality. These results may indicate that taste receptors respond to perturbation of water structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02124289
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  • 4
    Electronic Resource
    Electronic Resource
    Activity and substrate specificity of the fatty alcohol oxidase of Candida tropicalis in organic solvents (1991)
    Springer
    Applied microbiology and biotechnology 34 (1991), S. 441-445 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The alkane-induced, membrane-bound fatty alcohol oxidase of Candida tropicalis was functional with decanol as a model substrate in C8 to C12 alkanes and in cyclohexane. Optimal activity was with octane. Although some reaction took place without added water, 5–10% water gave optimal activity. A continuous spectrophotometric assay for following the enzyme activity in this system was developed. The enzyme, besides oxidizing primary long straight-chained alcohols, also oxidized long-chain diols, ω-hydroxy fatty acids, unsaturated fatty alcohols and branched-chained unsaturated fatty alcohols, although at diminished rates. Secondary alcohols or arylalkan-1-ols were not attacked. The K m for dodecanol was some 5000-fold higher than the K m for the same substrate when the reaction was carried out in water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180567
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of temperature and oxygen on cell growth and recombinant protein production in insect cell cultures (1993)
    Springer
    Applied microbiology and biotechnology 38 (1993), S. 619-623 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of temperature and O2 saturation on the production of recombinant proteins β-galactosidase and human glucocerebrosidase by Spodoptera frugiperda cells (Sf9) infected with recombinant Autographa californica nuclear polyhedrosis virus was investigated. The rates of cell growth, glucose consumption, O2 consumption and product expression were measured at temperatures between 22° C and 35° C. The results indicated that possible O2 limitation may be alleviated without compromising the maximum cell yield by lowering the incubation temperature from 27° C to 25° C. The expression level of the recombinant proteins at 27° C was similar to that obtained at 22° C and 25° C; lower protein yields were obtained at 30° C. An increase in temperature from 22° C to 27° C led to earlier production of the proteins and to an increase in the proportion of the product released outside the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182800
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  • 6
    Electronic Resource
    Electronic Resource
    Occurrence of fatty alcohol oxidase in alkane- and fatty-acid-utilising yeasts and moulds (1994)
    Springer
    Applied microbiology and biotechnology 40 (1994), S. 873-875 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract. Preparations of membrane fractions from 16 yeasts and three moulds were assayed for long-chain fatty alcohol oxidase (FAOD) activities after being grown on hexadecane or glucose and, in nine cases, on oleic acid. The enzyme was usually repressed in glucose-grown cells but in Candida bombicola ATCC 22 214 and Debaryomyces hansenii NCYC 33 appeared to be constitutive. Highest activities occurred in C. tropicalis and D. polymorphus (about 0.8 unit/mg protein) grown on hexadecane. Growth of yeasts on oleic acid partially induced FAOD activity but not with the moulds. In two strains of Yarrowia lipolytica (DSM 3286 and CBS 2076) no activity of FAOD was found but this could have been due to the known photo-lability of the enzyme. FAOD from different species shared similar characteristics with respect to substrate specificity and pH optimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050083
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  • 7
    Electronic Resource
    Electronic Resource
    Occurrence of fatty alcohol oxidase in alkane-and fatty-acid-utilising yeasts and moulds (1994)
    Springer
    Applied microbiology and biotechnology 40 (1994), S. 873-875 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Preparations of membrane fractions from 16 yeasts and three moulds were assayed for long-chain fatty alcohol oxidase (FAOD) activities after being grown on hexadecane or glucose and, in nine cases, on oleic acid. The enzyme was usually repressed in glucose-grown cells but in Candida bombicola ATCC 22 214 and Debaryomyces hansenii NCYC 33 appeared to be constitutive. Highest activities occurred in C. tropicalis and D. polymorphus (about 0.8 unit/mg protein) grown on hexadecane. Growth of yeasts on oleic acid partially induced FAOD activity but not with the moulds. In two strains of Yarrowia lipolytica (DSM 3286 and CBS 2076) no activity of FAOD was found but this could have been due to the known photo-lability of the enzyme. FAOD from different species shared similar characteristics with respect to substrate specificity and pH optimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173991
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  • 8
    Electronic Resource
    Electronic Resource
    Light sensitivity of then-alkane-induced fatty alcohol oxidase fromCandida tropicalis andYarrowia lipolytica (1990)
    Springer
    Applied microbiology and biotechnology 32 (1990), S. 461-464 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Fatty alcohol oxidase (FAOD) activities in microsomal membrane fractions fromn-alkane-grownCandida tropicalis andYarrowia lipolytica rapidly decreased on exposure to light. The rate of inactivation of the enzyme depended upon the intensity and wavelength of the incident light, but was diminished under anaerobic conditions. Partially purified and solubilised FAOD preparations remained photosensitive: FAOD fromY. lipolytica was more photo-labile than that fromC. tropicalis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903783
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  • 9
    Electronic Resource
    Electronic Resource
    Representation of partially ordered sets (1993)
    Springer
    Algebra universalis 30 (1993), S. 348-351 
    Details
    ISSN: 1420-8911
    Keywords: Primary O6A10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract It is well known [1] that any distributive poset (short for partially ordered set) has an isomorphic representation as a poset (Q, (−) such that the supremum and the infimum of any finite setF ofp correspond, respectively, to the union and intersection of the images of the elements ofF. Here necessary and sufficient conditions are given for similar isomorphic representation of a poset where however the supremum and infimum of also infinite subsetsI correspond to the union and intersection of images of elements ofI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190444
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  • 10
    Electronic Resource
    Electronic Resource
    The aditi deductive database system (1994)
    Springer
    The VLDB journal 3 (1994), S. 245-288 
    Details
    ISSN: 0949-877X
    Keywords: Logic ; implementation ; multi-user ; parallelism ; relational database
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Deductive databases generalize relational databases by providing support for recursive views and non-atomic data. Aditi is a deductive system based on the client-server model; it is inherently multi-user and capable of exploiting parallelism on shared-memory multiprocessors. The back-end uses relational technology for efficiency in the management of disk-based data and uses optimization algorithms especially developed for the bottom-up evaluation of logical queries involving recursion. The front-end interacts with the user in a logical language that has more expressive power than relational query languages. We present the structure of Aditi, discuss its components in some detail, and present performance figures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228882
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