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  • 1995-1999  (115)
  • 1
    Electronic Resource
    Electronic Resource
    Transient Heme N-Alkylation of Chloroperoxidase by Terminal Alkenes and Alkynes (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 817-818 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00107a026
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  • 2
    Electronic Resource
    Electronic Resource
    Highly Enantioselective Epoxidation of 1,1-Disubstituted Alkenes Catalyzed by Chloroperoxidase (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 6412-6413 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00128a053
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  • 3
    Electronic Resource
    Electronic Resource
    Quality Characteristics of Restructured Beef Steaks Manufactured by Various Techniques (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 60 (1995), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Beef (9–11% fat) was restructured with each of six mechanical treatments including chunking, fiberizing, slicing, chunking + slicing, slicing + water, and tenderizing each in combination with addition of 0.5% sodium chloride (salt)/0.5% phosphate, 0.5% Na-alginate/0.5% Ca-lactate, 0.5% Na-pectate/0.5% Ca-lactate, or no additives (control). Beef steaks restructured with salt/phosphate had lower (P〈0.05) purge losses: higher binding force and bind scores than control products. Steaks restructured with Na-alginate/Ca-lactate had lower cooking losses and higher bind scores than controls. Use of Na-pectate/Ca-lactate did not improve (P〉0.05) purge loss, cooking loss, binding force or sensory properties. Chunked meat or mixtures of chunked and sliced meats in combination with salt/phosphate or Na-alginateica-lactate resulted in steaks with acceptable bind and textural properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1995.tb05608.x
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  • 4
    Electronic Resource
    Electronic Resource
    Textural Characteristics of Wholewheat Pasta and Pasta Containing Non-Starch Polysaccharides (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 60 (1995), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pasta enriched with nonstarch polysaccharides, and wholewheat pasta were assessed for cooking quality. Xanthan gum improved pasta firmness when added at 1 and 2%, without affecting moisture uptake or degree of swelling when cooked for a constant time. Dynamic rheological testing indicated development of a network structure with addition of gums which contributed to overall pasta tirmness. Food grade pea fiber, at 5 and 10%, caused moderate reduction in firmness. Wholewheat pasta was similar in firmness to pasta with 10% pea fiber, as measured by Instron. Dynamic rheometry measurements indicated a weak network in wholewheat pasta. Small strain dynamic tests were more sensitive to subtle changes in network structure than were large deformation compression tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1995.tb04582.x
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation into the fractal scaling of the structure and strength of soil aggregates (1998)
    Oxford BSL : Blackwell Science Ltd
    European journal of soil science 49 (1998), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The hierarchical nature of soil structure is examined by measuring the physical properties of a range of aggregate sizes obtained using repetitive fracture. Fractals are used to assess the change with aggregate size of the specific volume, the proportion of pre-existing cracks which link to form the aggregate failure surface, and the aggregate failure stress. The pore size distribution, evaluated using mercury porosimetry and the application of the box counting algorithm to thin sections and thick sections, is also used to obtain a fractal dimension, D. Our results show that D depends upon the measurement approach for mass fractal scaling. This finding may limit the application of fractals to predict the scaling behaviour of soil physical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.1998.00147.x
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of soil water retention using random fractal networks (1997)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of soil science 48 (1997), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The derivation of pore size distributions from the soil water retention characteristic is complicated by the influence of the connectivity of the pore space on drainage. We examine this issue in the context of a random fractal pore network model. A two-dimensional one-parameter model simulates the drainage of water from an initially saturated pore network, explicitly accounting for the complex pore interactions which exist over a range of scales within the network. A parameter range is identified over which pore connections significantly hinder the advance of air into the network. The results demonstrate that connectivity between pores in a random structure can affect the drainage to an extent that in general it is not possible to obtain an accurate measure of the pore size distribution from the water retention data. These results, together with findings based on closely related multiscale network models, show that one should use with caution water retention models derived from fractal structures and based solely on pore size distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2389.1997.tb00563.x
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  • 7
    Electronic Resource
    Electronic Resource
    Soil friability: theory, measurement and the effects of management and organic carbon content (1998)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 49 (1998), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The weakest link between particles or aggregates determines the strength of soil. We have re-examined the theory and, as a result, have re-defined friability, F, as the coefficient of variation of soil tensile strength. The formal relationship between the parameter 1/α of the weakest link theory of strength, which has previously been used as a measure of friability, and the newly defined measure, F, is described by a simple equation which has an accuracy of within 2% over the range of interest. The quantity F is used to show that friability reaches maximum at water contents around the lower plastic limit, that mechanical disturbance of wet soil by tillage reduces the friability, and that friability is strongly positively correlated with the organic carbon content of the soil. These results show the merit of measuring friability for determining the optimum water content for tillage, for quantifying the damage done by different tillage practices, and as a theoretically based index of soil physical quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.1998.00129.x
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  • 8
    Electronic Resource
    Electronic Resource
    Water retention models for fractal soil structures (1996)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of soil science 47 (1996), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A review of water retention functions based upon fractal soil structures is presented. We consider the modelling approach for a fractal fabric, a fractal pore boundary and a fractal pore space, identifying the latter case as one of particular complexity. In each case, the water retention function is derived from the pore volume distribution arising from the structural model in question. We examine published models and highlight problems, namely lack of generality and inconsistency with the assumed fractal structure. The models considered in this paper do not account for the effects of pore connectivity, and as such their validity as a necessary condition for the existence of fractal structure is questionable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2389.1996.tb01365.x
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  • 9
    Electronic Resource
    Electronic Resource
    The application of fracture mechanics to crack propagation in dry soil (1995)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of soil science 46 (1995), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The application of fracture mechanics to dry soil has been investigated. Discs moulded from sand and kaolinite pastes, into which artificial tension cracks were introduced, were fractured using the indirect tension technique. The basic linear elastic fracture mechanics (LEFM) approach was found inadequate to describe the observed relation between the imposed flaw size and the failure stress. Fracture mechanics have been extended to dry soil by adding a crack length increment, Δc, to the imposed flaw size, c, to account for energy dissipation by processes other than the creation of new surfaces. This increment seems to represent the effective size of a ‘process zone’ ahead of the crack tip in which energy is dissipated by micro-cracking and internal friction. Further experiments done using specimens containing two collinear cracks separated by a variable distance and using samples of different size showed that the two cracks behaved effectively as one for separation distances less than about Δc. For specimen sizes much bigger than Δc fracture testing was found to be scale-invariant for geometrically similar specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2389.1995.tb01355.x
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  • 10
    Electronic Resource
    Electronic Resource
    Complete mechanical impedance increases the turgor of cells in the apex of pea roots (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In this paper we describe an experimental approach which allows turgor (p) in an impeded root to be measured without the need to remove the root from the impeding environment. The maximum axial growth pressure (σmax) generated by completely impeded pea (Pisum sativum L.) roots was measured using a novel apparatus incorporating a force transducer. The apparatus was designed so that it was possible to gain access to the impeded root with the microcapillary of a pressure probe and so obtain in situ measurements of P. Turgor in cells in the apical region of impeded roots was 0.78 MPa, compared with 0.55 MPa in unimpeded roots. In impeded roots, σmax was 0.52 MPa, showing that the pressure component resulting from cell wall tension (W, where W=P–σ) decreased from 0.55 to 0.26 MPa as the roots became impeded. When impeded roots were removed from the apparatus, there was no decrease in P over the following 90 min. Impedance did not cause P to change in the non-elongating part of the roots further from the apex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00217.x
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