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1.
SUSANNA DE CORDT MARC HENDRICKX GEERT MAESMANS PAUL TOBBACK 《International Journal of Food Science & Technology》1992,27(6):661-673
Biphasic and nth-order models were tested as to their usefulness to fit experimental inactivation data of Bacillus licheniformis α-amylase, immobilized on glass beads, and were discussed with respect to their suitability to characterize the considered enzymic system as a time—temperature integrator (TTI) to evaluate heat processes. Both isothermal and non-isothermal inactivation experiments were carried out. Model (kinetic) parameters (rate constant k, activation energy EA and reaction order n) were estimated using a non-linear regression procedure. The results obtained, especially the activation energy of about 293 kJ mole–1 , indicated a potential use of this system as a TTI for heating processes in the temperature range of 96–108°C. 相似文献
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The compressive strength of commercial high-density alumina was measured in several compressive biaxial stress states. The compressive strength was only slightly affected by the magnitude of the intermediate principal stress. The average value of the compressive strengths measured in all stress states, excluding the equibiaxial and the near-uniaxial compressive stress states, was 528 ksi. The average of the coefficients of variation was 3%. The tensile strength measured for the material indicates that the ratio of compressive strength to tensile strength is ∼ 18. 相似文献
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JEAN-PIERRE TISSIER GEORGE CORRIEU MARC LALANDE 《Journal of food process engineering》1982,6(1):37-53
With the aim of studying pre-rinsing and cleaning of a milk storage tank, different representative samples are collected during the process and their components (protein, sugar and lipid) analysed. The main conclusions of this study may be summarized as follows: (1) The mean thickness of milk remaining in the tank ranges around 20 μm. It depends on the dropping time and on the possible presence of milk foam. (2) The different main milk components do not exhibit the same removal rate and sugar seems to be completely removable by rinsing only. (3) Prerinsing may be characterized by four periods of which one depends on a diffusion mechanism. (4) Pre-rinse is a very rapid process which mainly depends on the pre-rinse solution volume used per unit of soiled surface. (5) Hard water, osmosed water alone or admixed with a surface active agent or caustic soda (1%) lead to the same results. 相似文献
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THERMAL AND HIGH-PRESSURE STABILITY OF PURIFIED PECTIN METHYLESTERASE FROM PLUMS (PRUNUS DOMESTICA) 总被引:3,自引:0,他引:3
CLÁUDIA S. NUNES SÓNIA M. CASTRO JORGE A. SARAIVA MANUEL A. COIMBRA MARC E. HENDRICKX ANN M. VAN LOEY 《Journal of Food Biochemistry》2006,30(2):138-154
Pectin methylesterase (PME) from greengage plums (Prunus domestica) has been extracted and purified using affinity chromatography. Only one band on sodium dodecyl sulfate–polyacrylamide gel electrophoresis was obtained, with an estimated molecular weight of 31 kDa. On isoelectric focusing electrophoresis, two bands with neutral isoelectric points (6.8 and 7.0) were detected. The optimal pH and temperature for plum PME activity were 7.5 and 65C, respectively. A study of purified plum PME thermostability was performed at pH 7.5 and 4.0, indicating a higher thermostability at pH 7.5 than at pH 4.0. A biphasic inactivation behavior was observed for thermal treatments (54–70C), whereas its pressure inactivation could be described by a first‐order kinetic model in a pressure range of 650–800 MPa at 25C. Purified plum PME was found to be relatively stable to thermal and pressure (≤600 MPa) treatments, compared to PME from other fruits. 相似文献
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Garage + Workshop explores issues of tectonics and transparency through the inventive juxtaposition of common building materials. Translucent polycarbonate panels reveal the physicality of light, construction, and imagery in what appears to be an otherwise straightforward utilitarian structure. 相似文献
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MICHAEL FITSILIS HERMANN KOHLSTEDT RAINER WASER MARC ULLMANN 《Integrated ferroelectrics》2013,141(1):45-58
A new concept for using a ferroelectric field effect transistor in a memory configuration is presented without the requirement of a negative voltage or an erase operation. The transistor is designed so that the accumulation sets in at a lower gate source voltage making it possible to reverse the polarization without applying a negative pulse to the gate. 相似文献
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The term urban renewal was introduced in France in the Loi solidarité et renouvellement urbains (Loi SRU) of December 13th, 2000. Until then, terms like renovation, reconstruction, recycling or refurbishment were used to indicate similar phenomena. Is the introduction of a new term only an innovation in vocabulary, or does it imply new orientations, conceptions and practices? It appears that ever since its introduction in 2000, the notion of urban renewal has been subject to variations in its meaning and in its implementation. A double regime of urban renewal exists. On the one hand, there are the operations officially labelled as urban renewal, which benefit from central state subsidies. These operations aim at a social urban development, and almost exclusively concern the so-called quartiers sensibles, large high-rise housing estates in the banlieus. On the other hand, there are more market-driven, locally initiated and realised operations of regeneration of derelict and run-down areas of the city. 相似文献