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  • 1
    Electronic Resource
    Electronic Resource
    Yield Stress and Microstructure of Set Yogurt Made from High Hydrostatic Pressure-Treated Full Fat Milk (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 67 (2002), 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: : Set yogurts were prepared from fortified milk subjected to the following processes: (a) Thermal process (85C,°C,35 min), (b) High hydrostatic pressure process (193 or 676 MPa for 5 or 30 min), and (c) Nonprocessed milk (control). Yogurts from milk treated with 676 MPa for 30 min exhibited similar yield stress and water-holding capacity (WHC) to yogurts from heated milk. Transmission Electron Microscopy (TEM) micrographs exhibited small round casein micelle aggregates without appendages in yogurts from heated milk. Yogurts from milk treated with 193 MPa and untreated milk exhibited low yield stress, low WHC, and large clusters of coalesced micelles. Mechanisms for gel formation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2002.tb09535.x
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic diversity in tropical maize inbred lines: heterotic group assignment and hybrid performance determined by RFLP markers (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 119 (2000), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Tropical maize inbred lines, eight derived from a Thai synthetic population (BR-105) and 10 from a Brazilian composite population (BR-106), were assayed for restriction fragment length polymorphisms with 185 clone-enzyme combinations. The aim of this study was to investigate genetic distances among tropical maize material and their relationship to heterotic group allocation and hybrid performance. Genetic distances (GDs) were on average greater for BR-105×BR-106 lines (0.77) than for BR-106×BR-106 (0.71) and for BR-105×BR-105 (0.69) lines. Cluster analysis resulted in a clear separation of BR-105 and BR-106 populations and was according to pedigree information. Correlations of parental GDs with single crosses and their heterosis for grain yield were high for line crosses from the same heterotic group and low for line combinations from different heterotic groups. Our results suggest that RFLP-based GDs are efficient and reliable to assess and allocate genotypes from tropical maize populations into heterotic groups. However, RFLP-based GDs are not suitable for predicting the performance of line crosses from genetically different heterotic groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2000.00539.x
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  • 3
    Electronic Resource
    Electronic Resource
    The RTX haemolysins ApxI and ApxII are major virulence factors of the swine pathogen Actinobacillus pleuropneumoniae: evidence from mutational analysis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 14 (1994), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The involvement of the RTX haemolysins (Apxl and ApxII) of the swine pathogen Actinobacillus pleuropneumoniae in virulence was investigated using haemolysin-deficient mutants constructed by a mini-Tn10 mutagenesis procedure. Two types of haemolysin mutant with single insertions of the transposon were obtained from a serotype 1 strain producing both ApxI and ApxII. One presented a complete loss of haemolytic activity because of the absence of ApxI and ApxII production. The other displayed weaker haemolysis than the wild type and produced only ApxII. The chromosomal regions flanking mini-Tn10 were cloned and sequenced. In the non-haemolytic mutant, the transposon had inserted in apxIB, a gene involved in the exportation of ApxI and ApxII toxins. The weakly haemolytic mutant resulted from the disruption of the structural gene for ApxI. Both mutations In the apxI operon were associated with a significant loss of virulence for mice and pigs, demonstrating that haemolysins are involved in A. pleuropneumoniae pathogenicity. The non-haemolytic mutant was apathogenic and the weakly haemolytic mutant retained some virulence for pigs, suggesting that both ApxI and ApxII are needed for full virulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1994.tb01282.x
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  • 4
    Electronic Resource
    Electronic Resource
    Polyphenoloxidase Activity, Polyphenols Concentration and Browning Intensity during Soursop (Annona muricata, L.) Maturation (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 59 (1994), 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: Values for polyphenoloxidase (PPO), total phenols and ascorbic acid, browning intensity and pH in soursops (Annona muricata, L.) decreased during maturation. Optimum pH was 7.5 (fully developed immature, mature unripe and ripe fruits) or 7.0 (fully ripe fruits). High correlation was found between PPO activity and phenolic compounds. The enzymic browning of soursops occurred during maturation. The least browning intensity was in fully ripe fruits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1994.tb08187.x
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  • 5
    Electronic Resource
    Electronic Resource
    Control of Browning During Storage of Apple Slices Preserved by Combined Methods. 4-Hexylresorcinol as Anti-Browning Agent (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), 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: Effectiveness of 4-hexylresorcinol to inhibit enzymatic and nonen-zymatic browning in apple slices preserved by combined methods was assessed during storage at four temperatures. Sodium sulfite and ascorbic acid-2-phosphate were used for comparison. Browning as measured by reflectance spectroscopy and based on visible light absorption was partially inhibited by 4-hexylresorcinol comparable to that of a fivefold sulfite concentration at 25°C. At temperature above 35°C, the inhibiting effect of 4-hexylresorcinol was minimal. Energy of activation of the browning reaction was 5–20 kcal/mol and was not affected by anti-browning treatment. Only induction time was delayed by the 4-hexylresorcinol and sulfite treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb09361.x
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  • 6
    Electronic Resource
    Electronic Resource
    Fractal Analysis to Characterize Ruggedness Changes in Tapped Agglomerated Food Powders (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), 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: Samples of commercial instant coffee and instant skim milk were exposed to attrition in a tap density tester. Digital images of the projected outlines of individual particles were obtained and the Fractal dimension of their profiles was computed with three different algorithms. Results show that the mean apparent Fractal value of the agglomerates varied with the number of tappings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb06105.x
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  • 7
    Electronic Resource
    Electronic Resource
    Infection of sardine eggs by the protistan endoparasite Ichthyodinium chabelardi off Portugal (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 57 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In 1997 and 1999 around 30% of the stations off Portugal sampled for sardine eggs Sardina pilchardus included eggs infected with Ichthyodinium chabelardi. A randomization test on the mean nearest neighbour distances of parasitized stations did not reveal evidence of significant spatial clustering. The mean prevalence of infection was c. 0·05 for both years, but the probability of parasite detection increased considerably with egg age. Eggs in their first day of development (before the embryo is formed) were not parasitized; most parasitized eggs were in the cohorts close to hatching. Although the reasons for age-dependent detection are unknown, if all parasitized eggs of the cohort ready to hatch were to die, infection by Ichthyodinium chabelardi would lead to mortality rates similar to those reported for the average daily mortality of sardine eggs and early larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02186.x
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  • 8
    Electronic Resource
    Electronic Resource
    MULTIOBJECTIVE REAL-TIME RESERVOIR OPERATION WITH A NETWORK FLOW ALGORITHM (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 37 (2001), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : A network flow algorithm has been developed for the optimization of real-time operation of a multiple reservoir system. Two purposes have been considered in the operation: flood control and hydropower generation. A special network structure was developed which allows the consideration of river routing. A multiobjective formulation is utilized thus allowing generation of a non-dominated curve. The effect of imperfect forecast on the performance of the real-time operation model is also evaluated. An application is made to a subsystem of the Brazilian hydroelectric system, located in the Paranapanema river basin. In this case study, the model showed good performance under the largest flood of the historical records.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2001.tb05516.x
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  • 9
    Electronic Resource
    Electronic Resource
    Reduction of Protease Activity in Simulated Milk Ultrafiltrate by Continuous Flow High Intensity Pulsed Electric Field Treatments (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), 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: A protease from Bacillus subtilis suspended in simulated milk ultrafiltrate (SMUF) was subjected to high intensity pulsed electric field (HIPEF) treatments of up to 6787 kJ/l, applying field strengths ranging from 19.7 to 35.5kV/cm up to 896 μs to evaluate the feasibility of this treatment on inactivating the enzyme. In addition, the influence of the pulse repetition rate (67, 89, and 111 Hz) and pulse width (4 and 7 μs) on the effectiveness of HIPEF treatments was tested. Protease activity was considerably reduced; a maximum inactivation of 62.7% was achieved after an 896-μS treatment at 35.5 kV/cm and 111 Hz. Protease activity decreased exponentially with increase of input energy density, treatment time, field strength, and pulse repetition rate when exposed to HIPEF processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2003.tb08270.x
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  • 10
    Electronic Resource
    Electronic Resource
    Adaptation of Classical Processes to New Technical Developments and Quality Requirements (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 69 (2004), 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: : Food safety, minimal food processing, energy savings, and nutritional and sensory quality are key drivers in today's food industry. While achieving these objectives, classical approaches to processing food are evolving to meet consumer expectations and regulatory requirements. Food equipment manufacturers are constantly trying to adapt classical technologies to their equipment, and it is amazing to see how old principles and techniques have evolved to meet new expectations in ways never imagined before. This article reviews the recent developments in classic unit operations in food processing, specifically, dehydration, freezing, and canning. Special attention is given to overall capacities, food quality, and economic aspects. Also included in this article are unit operations that have been technologically revisited to come up with truly creative ways to process foods in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2004.tb10715.x
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